WO1993013820A1 - Catheter introduction and holding system - Google Patents

Catheter introduction and holding system Download PDF

Info

Publication number
WO1993013820A1
WO1993013820A1 PCT/GB1993/000030 GB9300030W WO9313820A1 WO 1993013820 A1 WO1993013820 A1 WO 1993013820A1 GB 9300030 W GB9300030 W GB 9300030W WO 9313820 A1 WO9313820 A1 WO 9313820A1
Authority
WO
WIPO (PCT)
Prior art keywords
probe
insertion end
vessel
tube
loop
Prior art date
Application number
PCT/GB1993/000030
Other languages
French (fr)
Inventor
Stephen Brown
Original Assignee
Stephen Brown
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stephen Brown filed Critical Stephen Brown
Priority to GB9413452A priority Critical patent/GB2277271B/en
Publication of WO1993013820A1 publication Critical patent/WO1993013820A1/en

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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • 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
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
    • A61M25/0041—Catheters; Hollow probes characterised by the form of the tubing pre-formed, e.g. specially adapted to fit with the anatomy of body channels

Definitions

  • This invention relates to catheter systems.
  • the present invention provides a catheter system which militates against inadvertent expulsion while enabling the probe to be removed easily when required.
  • the invention comprises a catheter system comprising a flexible tubular probe adapted for introduction to a vessel via an outlet therefrom, characterised by having an insertion end which, after insertion into the vessel, is formed into a loop whereby to retain the probe against expulsion from the outlet.
  • the system may comprise rigid fill means adapted to hold the insertion end of the probe in straightened out condition during insertion.
  • the said rigid fill means may comprise a tube with an insertion end opening and a stillette in the tube holding the insertion end of the probe to the opening, the stillette being retractable from the opening, whereby to release the insertion end of the probe.
  • the stillette may pass into the probe through an aperture in the wall of the probe at the insertion end thereof and extend then further towards the end of the probe to hold said end within the tube for insertion into the vessel.
  • the insertion end of the probe may be normally formed in a loop which is elastically straightened out for insertion. However, the insertion end of the probe may be normally straight but deformed into a loop after insertion into the vessel. The insertion end of the probe may be deformed by a pull thread extending through the probe up to the insertion end thereof. The pull thread at the insertion end may pass out through the wall of the probe and be attached to the probe nearer the end thereof.
  • Figure 1 is a view of the separate components of a first system
  • Figure 2 is a view of the components assembled for insertion;
  • Figure 3 is an enlarged view of the insertion end of the assembly of Figure 2;
  • Figure 4 is a view of a probe of a second system
  • Figure 5 is a view of the second system assembled for insertion
  • Figure 6 is a view of the probe in place after insertion
  • Figures 7, 8 and 9 are views illustrating a modified arrangement
  • Figure 10 is a view of a further modified arrangement.
  • the drawings illustrate catheter systems comprising a flexible tubular probe 11 adapted for introduction to a vessel, such as the bladder of a patient undergoing urodynamical investigation, via an outlet from the vessel (the urethra of such a patient).
  • the probe 11 has an insertion end 12 which, after insertion into the vessel, is formed in a loop, as seen in Figures 1 and 6, Figure 1 being, of course, of the components of the system before assembly for insertion.
  • the loop 12 is formed, after insertion, in the vessel at the opening in the vessel into the outlet thereof and retains the probe against expulsion from the outlet which otherwise happens unintentionally, for example, when a patient urinates.
  • the insertion end of the probe 11 falls naturally into the loop configuration shown in Figure 1 and must be straightened out elastically for insertion. This is done using the rigid tube fill means 13 which holds the insertion end of the probe 11 in straightened out condition with the aid of stillette 14.
  • the tube 13 has an opening 15 at its insertion end and the stillette 14 which extends inside the tube 13 is inserted into the probe 11 through an aperture 11a in the wall thereof, as shown in more detail in Figure 3, and passed through and out of the insertion end of the probe 11 and lodged in the insertion end of the tube 13, which is closed off. This flattens out the natural loop 12 and holds the insertion end of the tube 13 so that the assembly can be introduced into the vessel through the outlet thereof.
  • the stillette 14 is retracted from the insertion end so as to release the probe 11 which then elastically restores its endwise loop configuration.
  • the fill tube 13 can then be withdrawn from the outlet.
  • the embodiment of Figures 3 to 6 avoids the production of a natural loop by using a modified probe arrangement.
  • the probe 31 is simply a straight (though of course flexible) piece of plastics tube which is mechanically deformed into a loop at the insertion end 32 after insertion by a pull thread 33 which extends through the probe 31 up to the insertion end 32 thereof, there passing out of the probe 31 through the wall of the probe and being attached to the probe nearer the end thereof, as, in this instance, by passing back into the probe and doubling back through the probe to a pull ring 34 at the distal end.
  • the insertion procedure is like that used for the embodiment of Figures 1 to 3 with the additional step of pulling on the ring 34 after releasing the insertion end 32 of the probe 31 from the fill tube 13 and before recovering the latter.
  • the probe 31 and tube 13 can be clipped together for insertion, the clip 35 being released prior to recovering of the tube 13.
  • a connection tube 36 for connecting the probe 31 to test apparatus traps the pull thread 33 to hold the loop against straightening. It is only necessary to release the pull thread 33 by disconnecting the tube 36 to allow the loop to straighten out permitting intentional removal fo the probe 31.
  • the pull thread 33 should, of course, be able to operate in the probe without jamming, and the dimensions and materials used in manufacture will be selected appropriately.
  • Figures 7, 8 and 9 illustrate a method of reinforcing the insertion end 12 of the probe 11 against kinking which, in the case of a really fine gauge flexible probe, could kink the probe at its tip into the neck of the bladder (as shown in Figure 8), occluding it.
  • the end 12 is reinforced with an insert 71 around which the pull thread is tied and which is then glued to the lumen of the probe 11.
  • Figure 7 also illustrates how the pull thread 33 exits the probe 11 near its tip and re-enters it a little further on, which arrangement facilitates loop formation. Also shown are additional apertures 72 in the probe 11 where it forms the loop 12 - these apertures 72 guarantee that pressure in the probe is in fact bladder pressure, not the pressure at some point within the urethra.
  • Figure 10 illustrates the pull thread 33 exiting the probe 11 near the distal end thereof the exit aperture 81 being covered by a watertight sleeve 82 - this avoids leakage and loss of measurement pressure due to the presence of the pull thread 33 in an attachment for the connection tube 36.
  • the probe is desirably some 40 cm in length, the fill tube 13 being for example about 38 cm long for convenience.
  • the fill tube 13 may have an outside diameter of about 3 mm.

Abstract

There is disclosed a catheter system comprising a flexible tubular probe (11) adapted for introduction to a vessel via an outlet therefrom, characterized by having an insertion end (12) which, after insertion into the vessel, is formed into a loop whereby to retain the probe against expulsion from the outlet.

Description

CATHETER INTRODUCTION AND HOLDING SYSTEM.
This invention relates to catheter systems.
For urodynamic measurements it is necessary to insert a probe tube through the urethra into the bladder. Such a probe tube is, however, easily inadvertently expelled.
The present invention provides a catheter system which militates against inadvertent expulsion while enabling the probe to be removed easily when required.
The invention comprises a catheter system comprising a flexible tubular probe adapted for introduction to a vessel via an outlet therefrom, characterised by having an insertion end which, after insertion into the vessel, is formed into a loop whereby to retain the probe against expulsion from the outlet.
The system may comprise rigid fill means adapted to hold the insertion end of the probe in straightened out condition during insertion. The said rigid fill means may comprise a tube with an insertion end opening and a stillette in the tube holding the insertion end of the probe to the opening, the stillette being retractable from the opening, whereby to release the insertion end of the probe. The stillette may pass into the probe through an aperture in the wall of the probe at the insertion end thereof and extend then further towards the end of the probe to hold said end within the tube for insertion into the vessel.
The insertion end of the probe may be normally formed in a loop which is elastically straightened out for insertion. However, the insertion end of the probe may be normally straight but deformed into a loop after insertion into the vessel. The insertion end of the probe may be deformed by a pull thread extending through the probe up to the insertion end thereof. The pull thread at the insertion end may pass out through the wall of the probe and be attached to the probe nearer the end thereof.
Embodiments of catheter systems according to the invention will now be described with reference to the accompanying drawings, in which :-
Figure 1 is a view of the separate components of a first system;
Figure 2 is a view of the components assembled for insertion; Figure 3 is an enlarged view of the insertion end of the assembly of Figure 2;
Figure 4 is a view of a probe of a second system;
Figure 5 is a view of the second system assembled for insertion;
Figure 6 is a view of the probe in place after insertion;
Figures 7, 8 and 9 are views illustrating a modified arrangement;
and Figure 10 is a view of a further modified arrangement.
The drawings illustrate catheter systems comprising a flexible tubular probe 11 adapted for introduction to a vessel, such as the bladder of a patient undergoing urodynamical investigation, via an outlet from the vessel (the urethra of such a patient). The probe 11 has an insertion end 12 which, after insertion into the vessel, is formed in a loop, as seen in Figures 1 and 6, Figure 1 being, of course, of the components of the system before assembly for insertion. The loop 12 is formed, after insertion, in the vessel at the opening in the vessel into the outlet thereof and retains the probe against expulsion from the outlet which otherwise happens unintentionally, for example, when a patient urinates.
In the system illustrated in Figures 1 to 3, the insertion end of the probe 11 falls naturally into the loop configuration shown in Figure 1 and must be straightened out elastically for insertion. This is done using the rigid tube fill means 13 which holds the insertion end of the probe 11 in straightened out condition with the aid of stillette 14.
The tube 13 has an opening 15 at its insertion end and the stillette 14 which extends inside the tube 13 is inserted into the probe 11 through an aperture 11a in the wall thereof, as shown in more detail in Figure 3, and passed through and out of the insertion end of the probe 11 and lodged in the insertion end of the tube 13, which is closed off. This flattens out the natural loop 12 and holds the insertion end of the tube 13 so that the assembly can be introduced into the vessel through the outlet thereof.
Once the insertion end is in the vessel, the stillette 14 is retracted from the insertion end so as to release the probe 11 which then elastically restores its endwise loop configuration. The fill tube 13 can then be withdrawn from the outlet.
The production of a natural loop at the insertion end of the probe 11 may require the use of relatively expensive plastics materials.
The embodiment of Figures 3 to 6 avoids the production of a natural loop by using a modified probe arrangement. Here, the probe 31 is simply a straight (though of course flexible) piece of plastics tube which is mechanically deformed into a loop at the insertion end 32 after insertion by a pull thread 33 which extends through the probe 31 up to the insertion end 32 thereof, there passing out of the probe 31 through the wall of the probe and being attached to the probe nearer the end thereof, as, in this instance, by passing back into the probe and doubling back through the probe to a pull ring 34 at the distal end.
The insertion procedure is like that used for the embodiment of Figures 1 to 3 with the additional step of pulling on the ring 34 after releasing the insertion end 32 of the probe 31 from the fill tube 13 and before recovering the latter. For convenience, the probe 31 and tube 13 can be clipped together for insertion, the clip 35 being released prior to recovering of the tube 13.
A connection tube 36 for connecting the probe 31 to test apparatus traps the pull thread 33 to hold the loop against straightening. It is only necessary to release the pull thread 33 by disconnecting the tube 36 to allow the loop to straighten out permitting intentional removal fo the probe 31.
The pull thread 33 should, of course, be able to operate in the probe without jamming, and the dimensions and materials used in manufacture will be selected appropriately.
Figures 7, 8 and 9 illustrate a method of reinforcing the insertion end 12 of the probe 11 against kinking which, in the case of a really fine gauge flexible probe, could kink the probe at its tip into the neck of the bladder (as shown in Figure 8), occluding it. The end 12 is reinforced with an insert 71 around which the pull thread is tied and which is then glued to the lumen of the probe 11.
Figure 7 also illustrates how the pull thread 33 exits the probe 11 near its tip and re-enters it a little further on, which arrangement facilitates loop formation. Also shown are additional apertures 72 in the probe 11 where it forms the loop 12 - these apertures 72 guarantee that pressure in the probe is in fact bladder pressure, not the pressure at some point within the urethra.
Figure 10 illustrates the pull thread 33 exiting the probe 11 near the distal end thereof the exit aperture 81 being covered by a watertight sleeve 82 - this avoids leakage and loss of measurement pressure due to the presence of the pull thread 33 in an attachment for the connection tube 36.
For a urodynamic catheter system, the probe is desirably some 40 cm in length, the fill tube 13 being for example about 38 cm long for convenience. The fill tube 13 may have an outside diameter of about 3 mm.

Claims

1. A catheter system comprising a flexible tubular probe adapted for introduction to a vessel via an outlet therefrom, characterised by having an insertion end which, after insertion into the vessel, is formed into a loop whereby to retain the probe against expulsion from the outlet.
2. A system according to claim 1, characterised by comprising rigid fill means adapted to hold the insertion end of the probe in straightened out condition during insertion.
3. A system according to claim 2, characterised in that said rigid fill means comprise a tube with an insertion end opening and a stillette in the tube holding the insertion end of the probe to the opening, the stillette being retractable from the opening whereby to release the insertion end of the probe.
4. A system according to claim 3, characterised in that the stillette passes into the probe through an aperture in the wall of the probe at the insertion end thereof and extends then further towards the ends of the probe to hold said end within the tube for insertion into the vessel.
5. A system according to any one of claims 1 to 4, characterised in that the insertion end of the probe is normally formed in a loop which is elastically straight¬ ened for insertion.
6. A system according to any one of claims 1 to 4, characterised in that the insertion end of the probe is normally straight but is deformed into a loop after insertion into the vessel.
7. A system according to claim 6, characterised in that the insertion end of the probe is deformed by a pull thread extending through the probe up to the insertion end thereof.
8. A system according to claim 7, characterised in that the pull thread at the insertion end passes out through the wall of the probe and is attached to the probe nearer the end thereof.
PCT/GB1993/000030 1992-01-10 1993-01-08 Catheter introduction and holding system WO1993013820A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9413452A GB2277271B (en) 1992-01-10 1993-01-08 Catheter introduction and holding system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9200496.9 1992-01-10
GB929200496A GB9200496D0 (en) 1992-01-10 1992-01-10 Catheter system

Publications (1)

Publication Number Publication Date
WO1993013820A1 true WO1993013820A1 (en) 1993-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000030 WO1993013820A1 (en) 1992-01-10 1993-01-08 Catheter introduction and holding system

Country Status (3)

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AU (1) AU3262693A (en)
GB (2) GB9200496D0 (en)
WO (1) WO1993013820A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995035066A1 (en) * 1994-06-17 1995-12-28 William Cook Europe A/S An apparatus for fragmentation of a lung embolus
EP1201263A3 (en) * 2000-10-24 2002-08-21 Vivek Thappa Closed-end infusion catheter and an introducer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924633A (en) * 1974-01-31 1975-12-09 Cook Inc Apparatus and method for suprapubic catheterization
US4643720A (en) * 1986-02-14 1987-02-17 Medi-Tech Drainage catheter
US4713049A (en) * 1986-08-05 1987-12-15 Medical Engineering Corporation Ureteral stent kit
EP0347170A1 (en) * 1988-06-13 1989-12-20 Indianapolis Center for Advanced Research Inc. Catheter system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924633A (en) * 1974-01-31 1975-12-09 Cook Inc Apparatus and method for suprapubic catheterization
US4643720A (en) * 1986-02-14 1987-02-17 Medi-Tech Drainage catheter
US4713049A (en) * 1986-08-05 1987-12-15 Medical Engineering Corporation Ureteral stent kit
EP0347170A1 (en) * 1988-06-13 1989-12-20 Indianapolis Center for Advanced Research Inc. Catheter system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995035066A1 (en) * 1994-06-17 1995-12-28 William Cook Europe A/S An apparatus for fragmentation of a lung embolus
EP1201263A3 (en) * 2000-10-24 2002-08-21 Vivek Thappa Closed-end infusion catheter and an introducer
US6939326B1 (en) 2000-10-24 2005-09-06 Vivek Thappa Closed-end infusion catheter with an introducer and a method for using the same

Also Published As

Publication number Publication date
GB2277271B (en) 1996-01-03
AU3262693A (en) 1993-08-03
GB2277271A (en) 1994-10-26
GB9413452D0 (en) 1994-08-31
GB9200496D0 (en) 1992-02-26

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