CA1135585A - Constant feed device - Google Patents
Constant feed deviceInfo
- Publication number
- CA1135585A CA1135585A CA000335593A CA335593A CA1135585A CA 1135585 A CA1135585 A CA 1135585A CA 000335593 A CA000335593 A CA 000335593A CA 335593 A CA335593 A CA 335593A CA 1135585 A CA1135585 A CA 1135585A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- container
- bag
- slot
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/148—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons flexible, e.g. independent bags
Abstract
ABSTRACT
Apparatus for the parenteral fluid administration to a patient, said apparatus including pressure applying piston to apply pressure to a flexible bag containing the parenteral fluid. The piston has indicator means to indicate its movement and stop devices can be adjustable positioned to give the piston a predetermined movement to dispense a predetermined quantity of fluid.
Apparatus for the parenteral fluid administration to a patient, said apparatus including pressure applying piston to apply pressure to a flexible bag containing the parenteral fluid. The piston has indicator means to indicate its movement and stop devices can be adjustable positioned to give the piston a predetermined movement to dispense a predetermined quantity of fluid.
Description
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1.
This invention relates to a constant feed device, particularly a constant feed device in the medical field, such as in drip units for infusion of a liquid into the vein of a patient.
5. BACKGROUND OF TIIE INVENTION
In drip feed units, it is a virtual requirement - that there be a constant flow or drip into the patient.
This ensures that the patient is under a constant state of medication. If the rate of medication is not uniform, 10. and if drugs are used which have a short half life, then quite often the patient is placed in a condition of alternatively being over treated and under treated, and often with the consequences of over treatment having side effects and undesirable reactions.
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1.
This invention relates to a constant feed device, particularly a constant feed device in the medical field, such as in drip units for infusion of a liquid into the vein of a patient.
5. BACKGROUND OF TIIE INVENTION
In drip feed units, it is a virtual requirement - that there be a constant flow or drip into the patient.
This ensures that the patient is under a constant state of medication. If the rate of medication is not uniform, 10. and if drugs are used which have a short half life, then quite often the patient is placed in a condition of alternatively being over treated and under treated, and often with the consequences of over treatment having side effects and undesirable reactions.
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2.
One form of drip device is the use of a bottle or bag which is held in an elevated position, and wherein the flow is regulated by an adjustable clamp on the hose to the cannula in the patient's vein. The flow of such a 5. unit varies due to the varying pressure head of the liquid, the flow decreasing as the liquid falls in level in the reservoir or bag or bottle.
Sophisticated units are available, these including electrically driven units, but with any electrical 10. device, severe insulation requirements have to be met to prevent even small current leakages measured in micro-amps which could be detrimental to a patient's heart.
Other forms of devices are known, such as disclosed in U.S. Pat. I~os. 3,895,741, 4,033,479 and l~est German 15. Pat. No. 2,731,448 in which the liquid to be dispensed is provided in a pliant bag, and a pressure applying means in the form of a piston or diaphragm pressurizes the liquid to dispense the liquid to be infused into the patient.
20. However, during the infusion of drugs or any liquid into a patient, it is essential that not only must the rate of infusion be closely monitored, but also the total dose be carefully controlled. Also it is essential that no air be infused at any time.
25. SU~IARY OF mHE INVENTIO~1 It is an object of this invention to provide an infusion device, or for the administration of parenteral fluid to a patient, in which the administration can be carefully controlled, not only as to the rate, but also 30. to the dose or quantity.
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A further object is to provide such an apparatus which can be preset to deliver a specific quantity at a specific rate.
A still further object is to pro~ide an apparatus which can be portable, and also to give a warning when the administration is completed.
Hence there is provided according to the invention an apparatus for the administration of parenteral fluid, said apparatus comprising a container adapted to support a pliant bag containing a liquid to be administered, said bag including an outlet means pressure applying means to apply a pressure to said bag to force the liquid therefrom, said pressure applying means being a rigid piston having a head and elongate body portion of lesser diameter than said head, a flexible diaphragm connected to said container to form an enclosed pressure area on one side of said piston to roll on said elongate body portion of said piston with said pliant bag situated on the other side of said piston, and adjustable pressure regulating means to admit fluid pressure to said enclosed pressure area.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic view of the feed device connected for use.
Figure 2 shows one form of constant feed device, and Figure 3 shows an alternate form of the device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring firstly to Figure 1, the constant feed device 1 is provided with an iniet 2 for a source of pressurizing gas at one end of the device, and at the other end is provided with an outlet 3 connected by tube 4 to a bubble trap 5. A further tube 4 connects the trap 5 to a fixed flow restrictor 6 before a further tube 4 connects to the infusion needle 7.
One form of drip device is the use of a bottle or bag which is held in an elevated position, and wherein the flow is regulated by an adjustable clamp on the hose to the cannula in the patient's vein. The flow of such a 5. unit varies due to the varying pressure head of the liquid, the flow decreasing as the liquid falls in level in the reservoir or bag or bottle.
Sophisticated units are available, these including electrically driven units, but with any electrical 10. device, severe insulation requirements have to be met to prevent even small current leakages measured in micro-amps which could be detrimental to a patient's heart.
Other forms of devices are known, such as disclosed in U.S. Pat. I~os. 3,895,741, 4,033,479 and l~est German 15. Pat. No. 2,731,448 in which the liquid to be dispensed is provided in a pliant bag, and a pressure applying means in the form of a piston or diaphragm pressurizes the liquid to dispense the liquid to be infused into the patient.
20. However, during the infusion of drugs or any liquid into a patient, it is essential that not only must the rate of infusion be closely monitored, but also the total dose be carefully controlled. Also it is essential that no air be infused at any time.
25. SU~IARY OF mHE INVENTIO~1 It is an object of this invention to provide an infusion device, or for the administration of parenteral fluid to a patient, in which the administration can be carefully controlled, not only as to the rate, but also 30. to the dose or quantity.
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A further object is to provide such an apparatus which can be preset to deliver a specific quantity at a specific rate.
A still further object is to pro~ide an apparatus which can be portable, and also to give a warning when the administration is completed.
Hence there is provided according to the invention an apparatus for the administration of parenteral fluid, said apparatus comprising a container adapted to support a pliant bag containing a liquid to be administered, said bag including an outlet means pressure applying means to apply a pressure to said bag to force the liquid therefrom, said pressure applying means being a rigid piston having a head and elongate body portion of lesser diameter than said head, a flexible diaphragm connected to said container to form an enclosed pressure area on one side of said piston to roll on said elongate body portion of said piston with said pliant bag situated on the other side of said piston, and adjustable pressure regulating means to admit fluid pressure to said enclosed pressure area.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic view of the feed device connected for use.
Figure 2 shows one form of constant feed device, and Figure 3 shows an alternate form of the device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring firstly to Figure 1, the constant feed device 1 is provided with an iniet 2 for a source of pressurizing gas at one end of the device, and at the other end is provided with an outlet 3 connected by tube 4 to a bubble trap 5. A further tube 4 connects the trap 5 to a fixed flow restrictor 6 before a further tube 4 connects to the infusion needle 7.
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The inlet 2 is connected to pressure reducing valve and regulator 8 which may be adjusted and preset as desired, the pressure selected being determined by the viscosity of the fluid being infused, and also the size 5. and length of the fixed restrictor 6. This restrictor can in its simplest form be a tube having a selected size and length, so that the flow therethrough is determined by the pressure of the fluid delivered by valve 8, the viscosity and the restrictor 6.
10. Ilence the desired flow rates for various fluids can be precalculated, and the operator can then select the desired pressure and the correct restrictor frorn the known calculations.
The feed device 1 can feed from the bottom thereof 15. as-shown in Fig. 1, or can feed from the top as shown in Fig. 2, it being realized that by using the device of Fig. 2, that this overcomes the problem of varying flows due to the varying head of fluid in the device.
.
The unit 1 comprises a cylinder 9 having a base 10, 20. and clamping there between a flexible diaphragm 11. A
piston 12, freely movable in the cylinder 9 is adapted to be supported by and moved by the diaphragm 11. Preferably as shown the piston 12 has a portion 13 depending from the head 14 of the piston, with the diaphragm 11 rolling 25. and unrolling about the flange 15.
The base 10 has attached thereto an adjustable constant pressure valve 8 which is adapted to pass constant fluid pressure to the chamber 16 below the diaphragm 11.
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The cylinder 9 can be of any suitable material, either metal or one oE the rigid plastics materials, and preferably can be transparent so that the interior thereof may be viewed.
5. As shown in Fig. 2 the cylinder 9 can have a longitudinal slot 17 extending along its upper portion of a length corresponding to the stroke of the piston.
An indicator 1~ such as a pointer held by a stud or screw 19 attached to the head of the piston co-operates 10. graduated scale on the cylinder.
The upper portion of the cylinder is adapted to receive a pliant bag of fluid to be dispensed and infused into the patient, the bag 20 being inserted through a quick opening lid 21 at the end of the cylinder, the 15. bag 20 having its outlet 22 extending through the lid 21.
Towards the upper end of the slot 17 there is provlded a stop 23 this stop having preferably incorporated therewith an alarm or other signal device, to stop the piston at the desired time to ensure that the piston 20. stops when the bag is empty and to ensure no air is dispensed. Adjustable straps can also be positioned along the slot 17, so that the piston will stop when a desired quantity of fluid has been dispensed.
An alternative form o the invention is shown in Fig.
25. 3 which will c;ive a more accurate indication of the amount of fluid dispensed. In this embodiment the piston has attached thereto by studs or rivets a member in the A form of a ~ 24 which is adapted to slide in said slot.
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The rack 24 has teeth and mounted on the cylinder 9 is a housing 25 carrying a shaft 26 on which is mounted a pinion 27 engaging the teeth of the rack 24.
The other end of the shaft 26 is connected either 5. directly or through gearing to a pointer 2~ moving over scale 29 to give an amplified indication of the piston movement.
The source of fluid pressure can be of any regular supply of 2~ N, CO2 or other supply of fluid pressure 10. in a hospital operating theatre or the like.
In the line of feed from the flexible bag 20 to the patient, there is provided the calibrated flow restriction device 6, so that as the liquid is under a constant head due to the constant pressure, and as the calibrated 15. flow restrictor device has a constant aperture therethrough, the desired constant flow rate is achieved.
The calibrated flow restrictor 6 can be a small cylindrical unit having the desired hole or aperture therethrough, so that in order to change the flow rate it 20. is merely necessary to replace the flow restrictor with one of the required calibration.
Thus it will be seen that as there is a constant pressure applied to the liquid in the flexible bag or container, that there is in effect a constant head on 25. the liquid to flow through the calibration device in order ~o ensure the desired uniform flow.
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~ 1ith this form of unit, the constant flow can be achieved by connection to the normal pressurized supply of gas which is available, either from a gas bottle or from some pressurized source, and the folded 5. diaphragm ensures that the piston moves in the container in a free and non-sticking manner.
The container can be formed of a clear material such as glass or one of -the rigid plastics material, or a clear window like area can be provided in one lO. side of the container so that the users of the unit can readily determine the amount of liquid remaining in the container.
Adjustable stop means can be provided to engage the slot, and in its simplest form can comprise a stud 15. engaging a sleeve or small nut engaging the interior of the cylinder wall through the slot, so that by loosening the stud the stop can be repositioned.
In a further alternative the device could be incorporated in a portable unit, so that a patient can 20. receive medication whilst ambulatory. A small pressurized source of air or other gas or a spring loaded pressure source can be used, which can be "loaded" on pre-tensioned or pre-pressurized by any means for example manually.
This would be a small lightweight device, and a 25. smaller sachet or bag of fluid can be infused in this instance.
In another form of the invention there can be provided a linear caliper device mounted on the container ~L13.~58~
adjacent the viewing slot or aperture through which the piston can be viewed.
The linear caliper can be positioned, and preferably adjustably positioned on the container such that the 5. fixed arm of the caliper can be positioned to indicate the position of the piston at the beginning of the infusion period. After a certain period of time, or any desired period of time the movable arm of the caliper can then be positioned to indica-te the new position of 10. the piston, and the distance between the two arms of the caliper can then be read and by having the graduations on the caliper suitably pre-calibrated, the quantity infused can be readily determined.
In order to take a further reading at a later date, 15. either the reading at the present is noted and this compared with a reading at the later time, or alternatively the caliper is positioned so that the fixed arm of the caliper is positioned to coincide with the position of the piston and thus the later reading can be taken in 20. the same manner as the earlier reading.
Preferably the caliper is a slide caliper, and can be mounted in brackets or the like screwed or other . ., wise affixed to the container wall. The caliper can be positioned adjustably in the brackets so that the fixed 25. arm can be positioned as desired on the piston at the beginning of the infusion period.
The reading of the position of the piston can be taken from a suitable point or surface on the piston, or alternatively the piston can be provided with a suitable 30. line or mark or the like.
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9.
Although a linear caliper has been described as being suitable for the purpose, other forms of measuring devices can be provided in order to measure the movement of the piston over a certain perlod of time, from which 5. the rate of infusion can be reaclily calculated.
~ lso the piston can incorporate in conjunction with the surrounding cylinder or casing an adjustable stop or the like, so tha-t where a certain quantity of liquid is to be infused, -the stop can be positioned to 10. contact the piston when that desired quantity has been infused to prevent the further movement of the piston.
This is particularly advantageous where for example a certain quantity of drug has to be infused to a patient such as a baby, and any excess infusion would be 15. detrimental to the baby or patient so that by adjusting the stop the certain quantity can be infused and no further infusion can take place. This is a form of fail-safe device on the unit.
Similarly the stop can be provided adjustably on the 20. piston for example working on the groove of the piston to contact the abutment on the casing, alternatively the adjustment could be by a movable abutment on the casing.
In this connection also it is desirable that lnfusion terminate before all the liquid has been dispensed from 25. the bag or container in order to prevent the infusion of air into the patient, and in this respect a stop can be provided on the device so that infusion cannot proceed past a certain point so that at all times there is sufficient quantity of liquid in the bag to prevent the 30. accidental infusion of any air.
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10 .
It is also to be realised with the present invention that while conventional pistons are circular, that with the present invention the piston can be of a shape other than circular, for example square or the like 5. so that if the infusing liquid is packaged in a square container this can be readily positioned into the square casing.
It is to be realised also that other forms of pistons and shapes of pistons can be utilized with the 10. present invention.
The piston can be driven by any suitable form, such as a spring, or air pressure or any driving force such as a weight or the like. In this connection also in order to provide complete portabllity of the infu~ing apparatus, 15. the piston could be propelled by a portable source of pressurized fluid, such as a small carbon dioxide cylinder. In this way the unit can be particularly effective as a portable unit for use in emergencies, ambulances and the like, or even transporting the patient 20. through a hospital from one locality to another.
The restriction for determining the flow can be any form of device and in one preferred form the restriction could be provided by a tubular portion of a syringe, or even by a hypodermic needle itself.
25. Also it is to be realised that a bubble trap is provided so that an air interface is available to prevent the accidental passage of any air bubbles through the unit into the patient.
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Also in accordance with the invention the pressure release valve is situated and designed to blow o-ff into the atmosphere, so -that even if there is an accidental increase in pressure, there is no chance of any of this 5. excessive pressure being applied to the piston or the li~e in order -to give an increase in infusion rate.
Also an alarm could be triggered by any sudden fall or decrease in fluid pressure, so that when this alarm sounds the a-ttending staff are warned that 10. infusion has ceased, this preferably being incorporated in the valve.
' ' .
The inlet 2 is connected to pressure reducing valve and regulator 8 which may be adjusted and preset as desired, the pressure selected being determined by the viscosity of the fluid being infused, and also the size 5. and length of the fixed restrictor 6. This restrictor can in its simplest form be a tube having a selected size and length, so that the flow therethrough is determined by the pressure of the fluid delivered by valve 8, the viscosity and the restrictor 6.
10. Ilence the desired flow rates for various fluids can be precalculated, and the operator can then select the desired pressure and the correct restrictor frorn the known calculations.
The feed device 1 can feed from the bottom thereof 15. as-shown in Fig. 1, or can feed from the top as shown in Fig. 2, it being realized that by using the device of Fig. 2, that this overcomes the problem of varying flows due to the varying head of fluid in the device.
.
The unit 1 comprises a cylinder 9 having a base 10, 20. and clamping there between a flexible diaphragm 11. A
piston 12, freely movable in the cylinder 9 is adapted to be supported by and moved by the diaphragm 11. Preferably as shown the piston 12 has a portion 13 depending from the head 14 of the piston, with the diaphragm 11 rolling 25. and unrolling about the flange 15.
The base 10 has attached thereto an adjustable constant pressure valve 8 which is adapted to pass constant fluid pressure to the chamber 16 below the diaphragm 11.
.... .
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The cylinder 9 can be of any suitable material, either metal or one oE the rigid plastics materials, and preferably can be transparent so that the interior thereof may be viewed.
5. As shown in Fig. 2 the cylinder 9 can have a longitudinal slot 17 extending along its upper portion of a length corresponding to the stroke of the piston.
An indicator 1~ such as a pointer held by a stud or screw 19 attached to the head of the piston co-operates 10. graduated scale on the cylinder.
The upper portion of the cylinder is adapted to receive a pliant bag of fluid to be dispensed and infused into the patient, the bag 20 being inserted through a quick opening lid 21 at the end of the cylinder, the 15. bag 20 having its outlet 22 extending through the lid 21.
Towards the upper end of the slot 17 there is provlded a stop 23 this stop having preferably incorporated therewith an alarm or other signal device, to stop the piston at the desired time to ensure that the piston 20. stops when the bag is empty and to ensure no air is dispensed. Adjustable straps can also be positioned along the slot 17, so that the piston will stop when a desired quantity of fluid has been dispensed.
An alternative form o the invention is shown in Fig.
25. 3 which will c;ive a more accurate indication of the amount of fluid dispensed. In this embodiment the piston has attached thereto by studs or rivets a member in the A form of a ~ 24 which is adapted to slide in said slot.
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The rack 24 has teeth and mounted on the cylinder 9 is a housing 25 carrying a shaft 26 on which is mounted a pinion 27 engaging the teeth of the rack 24.
The other end of the shaft 26 is connected either 5. directly or through gearing to a pointer 2~ moving over scale 29 to give an amplified indication of the piston movement.
The source of fluid pressure can be of any regular supply of 2~ N, CO2 or other supply of fluid pressure 10. in a hospital operating theatre or the like.
In the line of feed from the flexible bag 20 to the patient, there is provided the calibrated flow restriction device 6, so that as the liquid is under a constant head due to the constant pressure, and as the calibrated 15. flow restrictor device has a constant aperture therethrough, the desired constant flow rate is achieved.
The calibrated flow restrictor 6 can be a small cylindrical unit having the desired hole or aperture therethrough, so that in order to change the flow rate it 20. is merely necessary to replace the flow restrictor with one of the required calibration.
Thus it will be seen that as there is a constant pressure applied to the liquid in the flexible bag or container, that there is in effect a constant head on 25. the liquid to flow through the calibration device in order ~o ensure the desired uniform flow.
.~
-, 5~1 i 7.
~ 1ith this form of unit, the constant flow can be achieved by connection to the normal pressurized supply of gas which is available, either from a gas bottle or from some pressurized source, and the folded 5. diaphragm ensures that the piston moves in the container in a free and non-sticking manner.
The container can be formed of a clear material such as glass or one of -the rigid plastics material, or a clear window like area can be provided in one lO. side of the container so that the users of the unit can readily determine the amount of liquid remaining in the container.
Adjustable stop means can be provided to engage the slot, and in its simplest form can comprise a stud 15. engaging a sleeve or small nut engaging the interior of the cylinder wall through the slot, so that by loosening the stud the stop can be repositioned.
In a further alternative the device could be incorporated in a portable unit, so that a patient can 20. receive medication whilst ambulatory. A small pressurized source of air or other gas or a spring loaded pressure source can be used, which can be "loaded" on pre-tensioned or pre-pressurized by any means for example manually.
This would be a small lightweight device, and a 25. smaller sachet or bag of fluid can be infused in this instance.
In another form of the invention there can be provided a linear caliper device mounted on the container ~L13.~58~
adjacent the viewing slot or aperture through which the piston can be viewed.
The linear caliper can be positioned, and preferably adjustably positioned on the container such that the 5. fixed arm of the caliper can be positioned to indicate the position of the piston at the beginning of the infusion period. After a certain period of time, or any desired period of time the movable arm of the caliper can then be positioned to indica-te the new position of 10. the piston, and the distance between the two arms of the caliper can then be read and by having the graduations on the caliper suitably pre-calibrated, the quantity infused can be readily determined.
In order to take a further reading at a later date, 15. either the reading at the present is noted and this compared with a reading at the later time, or alternatively the caliper is positioned so that the fixed arm of the caliper is positioned to coincide with the position of the piston and thus the later reading can be taken in 20. the same manner as the earlier reading.
Preferably the caliper is a slide caliper, and can be mounted in brackets or the like screwed or other . ., wise affixed to the container wall. The caliper can be positioned adjustably in the brackets so that the fixed 25. arm can be positioned as desired on the piston at the beginning of the infusion period.
The reading of the position of the piston can be taken from a suitable point or surface on the piston, or alternatively the piston can be provided with a suitable 30. line or mark or the like.
1~355~
9.
Although a linear caliper has been described as being suitable for the purpose, other forms of measuring devices can be provided in order to measure the movement of the piston over a certain perlod of time, from which 5. the rate of infusion can be reaclily calculated.
~ lso the piston can incorporate in conjunction with the surrounding cylinder or casing an adjustable stop or the like, so tha-t where a certain quantity of liquid is to be infused, -the stop can be positioned to 10. contact the piston when that desired quantity has been infused to prevent the further movement of the piston.
This is particularly advantageous where for example a certain quantity of drug has to be infused to a patient such as a baby, and any excess infusion would be 15. detrimental to the baby or patient so that by adjusting the stop the certain quantity can be infused and no further infusion can take place. This is a form of fail-safe device on the unit.
Similarly the stop can be provided adjustably on the 20. piston for example working on the groove of the piston to contact the abutment on the casing, alternatively the adjustment could be by a movable abutment on the casing.
In this connection also it is desirable that lnfusion terminate before all the liquid has been dispensed from 25. the bag or container in order to prevent the infusion of air into the patient, and in this respect a stop can be provided on the device so that infusion cannot proceed past a certain point so that at all times there is sufficient quantity of liquid in the bag to prevent the 30. accidental infusion of any air.
~3558~
10 .
It is also to be realised with the present invention that while conventional pistons are circular, that with the present invention the piston can be of a shape other than circular, for example square or the like 5. so that if the infusing liquid is packaged in a square container this can be readily positioned into the square casing.
It is to be realised also that other forms of pistons and shapes of pistons can be utilized with the 10. present invention.
The piston can be driven by any suitable form, such as a spring, or air pressure or any driving force such as a weight or the like. In this connection also in order to provide complete portabllity of the infu~ing apparatus, 15. the piston could be propelled by a portable source of pressurized fluid, such as a small carbon dioxide cylinder. In this way the unit can be particularly effective as a portable unit for use in emergencies, ambulances and the like, or even transporting the patient 20. through a hospital from one locality to another.
The restriction for determining the flow can be any form of device and in one preferred form the restriction could be provided by a tubular portion of a syringe, or even by a hypodermic needle itself.
25. Also it is to be realised that a bubble trap is provided so that an air interface is available to prevent the accidental passage of any air bubbles through the unit into the patient.
3r~r~
Also in accordance with the invention the pressure release valve is situated and designed to blow o-ff into the atmosphere, so -that even if there is an accidental increase in pressure, there is no chance of any of this 5. excessive pressure being applied to the piston or the li~e in order -to give an increase in infusion rate.
Also an alarm could be triggered by any sudden fall or decrease in fluid pressure, so that when this alarm sounds the a-ttending staff are warned that 10. infusion has ceased, this preferably being incorporated in the valve.
' ' .
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for the administration of parenteral fluids, said apparatus comprising a container adapted to support a pliant bag containing a liquid to be administered, said bag including an outlet means pressure applying means to apply a pressure to said bag to force the liquid therefrom, said pressure applying means being a rigid piston having a head and elongate body portion of lesser diameter than said head, a flexible diaphragm connected to said container to form an enclosed pressure area on one side of said piston to roll on said elongate body portion of said piston with said pliant bag situated on the other side of said piston, and adjustable pressure regulating means to admit fluid pressure to said enclosed pressure area.
2. Apparatus as defined in claim 1 wherein said outlet means includes an outlet on said bag through which the liquid is forced, and a fluid flow restrictor connected to said outlet.
3. Apparatus as defined in claim 1 or 2, wherein at least a portion of the container wall is transparent whereby the piston and pliant bag may be viewed.
4. Apparatus as defined in claim 1 or 2, wherein said diaphragm has cylindrical walls and is attached at one end of said container and including a longitudinal slot in a wall of said container, and indicator means on said piston protruding through said slot to cooperate with a scale on said container wall.
5. Apparatus as defined in claim 1 or 2, wherein said diaphragm has cylindrical walls and is attached at one end of said container and including a longitudinal slot in a wall of said container, and indicator means on said piston protruding through said slot to cooperate with a scale on said container wall, including stop means engageable in said slot to limit movement of said piston.
6. Apparatus as defined in claim 1, including stop means to prevent movement of said piston at the discharge end of its stroke, and alarm means associated with said stop means.
7. Apparatus as defined in claim 1, including a longitudinal slot in said cylinder, a longitudinal strip attached to said piston and associated with said slot, a pinion mounted on said cylinder exterior wall, said pinion being connected to an indicating needle traversing over a scale, and teeth on said strip engageable with said pinion.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPD5969/78 | 1978-09-15 | ||
| AUPD596978 | 1978-09-15 | ||
| AUPD681978 | 1978-11-17 | ||
| AUPD6819/78 | 1978-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1135585A true CA1135585A (en) | 1982-11-16 |
Family
ID=25642250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000335593A Expired CA1135585A (en) | 1978-09-15 | 1979-09-13 | Constant feed device |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4280637A (en) |
| CA (1) | CA1135585A (en) |
| DE (1) | DE2937444A1 (en) |
| FR (1) | FR2435951A1 (en) |
| GB (1) | GB2034183B (en) |
| IN (1) | IN151725B (en) |
| IT (1) | IT1123165B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4808346A (en) * | 1972-07-20 | 1989-02-28 | Strenger & Associates | Carbonated beverage dispensing apparatus and method |
| US4557728A (en) * | 1982-05-21 | 1985-12-10 | Repro-Med Systems, Inc. | Spring-operated liquid-dispensing device |
| US4447232A (en) * | 1982-05-21 | 1984-05-08 | Repro-Med Systems, Inc. | Spring-operated liquid-dispensing device |
| US4666430A (en) * | 1984-12-05 | 1987-05-19 | I-Flow Corporation | Infusion pump |
| US5060826A (en) * | 1988-08-25 | 1991-10-29 | Fabricated Metals, Inc. | Container with inflatable vessel for controlling flow of liquid or viscous material |
| GB2229636A (en) * | 1989-03-29 | 1990-10-03 | Chang Chin Fu | Automatic medicine dispensing apparatus |
| GB2238479B (en) * | 1989-12-20 | 1994-04-06 | Chen A Tien | Drip infusion set |
| US5076471A (en) * | 1990-05-07 | 1991-12-31 | Fabricated Metals, Inc. | Bulk material container having a flexible liner with a follower |
| US5282550A (en) * | 1991-06-20 | 1994-02-01 | Fabricated Metals, Inc. | Bulk material container with a flexible liner |
| ZA944634B (en) | 1993-06-29 | 1995-02-17 | Robert H Abplanalp | Flexible barrier member useful in aerosol dispensers |
| US6419129B1 (en) | 1994-06-02 | 2002-07-16 | Robert Henry Abplanalp | Flexible barrier member useful in aerosol dispensers |
| GB2304584A (en) * | 1995-08-23 | 1997-03-26 | Graham Cameron Grant | Infusion device comprising a collapsible bag and a movable wall |
| IE960204A1 (en) * | 1996-03-04 | 1997-09-10 | Loctite Ireland Ltd | Fluid flow connector and fluid pressure mechanism for fluids¹such as adhesives |
| DE20222004U1 (en) | 2002-06-19 | 2010-06-24 | SCHÜTZE, Thomas | Positive displacement pump and a positive displacement pump having the device for dosing at least one flowable component |
| US7198073B2 (en) * | 2002-07-26 | 2007-04-03 | Gfi, Innovations | Methodology and apparatus for storing and dispensing liquid components to create custom formulations |
| US20060048841A1 (en) * | 2002-07-26 | 2006-03-09 | Gfi Innovations, Llc | Methodology and apparatus for storing and dispensing liquid components to create custom formulations |
| EP2155295A2 (en) * | 2007-05-11 | 2010-02-24 | Medingo Ltd. | A modular skin-patch type medical fluid delivery device |
| EP2135668B1 (en) * | 2008-06-20 | 2013-08-21 | Fillon Technologies | Device for storing, selecting and dispensing base colours for paint, in particular for automotive paint |
| US20130074982A1 (en) * | 2011-09-28 | 2013-03-28 | Gfi Innovations, Inc. | Methodology and Apparatus for Storing and Dispensing Liquid Components to Create Custom Formulations |
| FR2991881B1 (en) * | 2012-06-13 | 2014-09-05 | Medex Sa | DEVICE FOR INJECTING A LIQUID PRODUCT COMPRISING TWO MOBILE HALF-SHELLS IN ROTATION IN RELATION TO EACH OTHER |
| US20140326752A1 (en) * | 2013-05-06 | 2014-11-06 | E I Du Pont De Nemours And Company | Dispensing vessel having a self-supporting secondary container for use in a printing apparatus for depositing a liquid composition on a backplane |
| US20150166323A1 (en) * | 2013-12-09 | 2015-06-18 | Nin Lei TANG | System, apparatus and method for handling and dispensing a food or beverage product |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1750979A (en) * | 1926-10-12 | 1930-03-18 | Koehring Co | Water-measuring tank |
| FR873745A (en) * | 1941-03-05 | 1942-07-17 | Device for automatically mixing two liquids, sterile or not, in an intimate and continuous manner and in determined proportions | |
| GB1168263A (en) * | 1966-03-04 | 1969-10-22 | James C Ii Hobbs | Apparatus for Injecting Radio Opaque Liquid into a Vascular System |
| US3425415A (en) * | 1966-05-02 | 1969-02-04 | Iit Res Inst | Controlled infusion system |
| US3506005A (en) * | 1967-02-23 | 1970-04-14 | Arthur S Gilio | Pressure infusion device for medical use |
| US3561644A (en) * | 1967-10-17 | 1971-02-09 | Evertt L Works | Product dispenser and valve therefor |
| US3640277A (en) * | 1968-12-09 | 1972-02-08 | Marvin Adelberg | Medical liquid administration device |
| AU465176B2 (en) * | 1971-09-28 | 1975-09-02 | Beston Engineering Pty. Limited | Intravenous fluids administration apparatus |
| US3774603A (en) * | 1971-11-26 | 1973-11-27 | American Hospital Supply Corp | Medical liquid administration set with optical liquid level indicator |
| US4014010A (en) * | 1975-08-01 | 1977-03-22 | Walter Joseph Jinotti | Fluid-dispensing apparatus having level control and alarm means |
| GB1583157A (en) * | 1976-05-07 | 1981-01-21 | Kenova Ab | Syringes |
| US4059110A (en) * | 1976-10-07 | 1977-11-22 | Timex Corporation | Clockwork driven hypodermic syringe |
-
1979
- 1979-09-12 GB GB7931588A patent/GB2034183B/en not_active Expired
- 1979-09-12 IN IN956/CAL/79A patent/IN151725B/en unknown
- 1979-09-12 US US06/075,319 patent/US4280637A/en not_active Expired - Lifetime
- 1979-09-13 CA CA000335593A patent/CA1135585A/en not_active Expired
- 1979-09-14 IT IT25734/79A patent/IT1123165B/en active
- 1979-09-14 FR FR7922991A patent/FR2435951A1/en active Granted
- 1979-09-15 DE DE19792937444 patent/DE2937444A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| IN151725B (en) | 1983-07-16 |
| IT7925734A0 (en) | 1979-09-14 |
| GB2034183B (en) | 1983-05-05 |
| FR2435951B1 (en) | 1985-03-01 |
| DE2937444C2 (en) | 1989-01-26 |
| IT1123165B (en) | 1986-04-30 |
| US4280637A (en) | 1981-07-28 |
| DE2937444A1 (en) | 1980-03-27 |
| GB2034183A (en) | 1980-06-04 |
| FR2435951A1 (en) | 1980-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |