CA2231762A1 - A device to stabilise the lamina - Google Patents
A device to stabilise the lamina Download PDFInfo
- Publication number
- CA2231762A1 CA2231762A1 CA002231762A CA2231762A CA2231762A1 CA 2231762 A1 CA2231762 A1 CA 2231762A1 CA 002231762 A CA002231762 A CA 002231762A CA 2231762 A CA2231762 A CA 2231762A CA 2231762 A1 CA2231762 A1 CA 2231762A1
- Authority
- CA
- Canada
- Prior art keywords
- lamina
- spacing means
- laminoplasty
- stabilising
- dynamically
- 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.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7071—Implants for expanding or repairing the vertebral arch or wedged between laminae or pedicles; Tools therefor
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Neurology (AREA)
- Surgery (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Animal Behavior & Ethology (AREA)
- Engineering & Computer Science (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Dowels (AREA)
- Surgical Instruments (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
A device for dynamically stabilising the lamina (4) after a laminoplasty includes spacing means (10) which are shaped to engage between the severed edges of the lamina. The device also includes retaining means (17) attached to the spacing means (10) which are shaped to maintain the spacing means in an operable position. A method of dynamically stabilising the lamina after a laminoplasty is also provided, which includes the steps of positioning a spacing means (10) between the severed edges of the lamina (4), and positioning a retaining means (17) attached to the spacing means (10) to maintain the spacing means (10) in an operable position.
Description
W O 97/09940 PCT~NZ9''.OC9 A DEVICE TO STABILISE THE LAM~A
i This invention relates to a device t_at dynamically stabilises the l~min~ after a 5 laminoplasty.
BACKGROUND
Cervical spinal stPnosi~ is a conllitior in w_ich the opening for the spinal cord that runs through the vertebrae of the spinal column is not quite wide enough to co~lrol Lably 10 accommodate the spinal cord. The result is that when the ligaments thick~n or there is some bulging of the cervical discs (a natural product of wear and tear through life) the person who is affected begins to experience pressure on their spinal cord. This causes three types of sy~ oms:
1. It causes pain in the head, neck and arms;
i This invention relates to a device t_at dynamically stabilises the l~min~ after a 5 laminoplasty.
BACKGROUND
Cervical spinal stPnosi~ is a conllitior in w_ich the opening for the spinal cord that runs through the vertebrae of the spinal column is not quite wide enough to co~lrol Lably 10 accommodate the spinal cord. The result is that when the ligaments thick~n or there is some bulging of the cervical discs (a natural product of wear and tear through life) the person who is affected begins to experience pressure on their spinal cord. This causes three types of sy~ oms:
1. It causes pain in the head, neck and arms;
2. It causes we~kness and/or nllmhness and ting1in~ in the arms;
3. It causes clnm~in~ss in the arms and legs.
As a result of these sylll~ s, some people find that their mobility and their ability to 20 undertalce a normal day's work is severely affected. The obvious solution is to make more room for the spinal cord so that the pressure will not happen.
There are two methods of creating more room in the cervical spinal canal. The first is a laminectomy in which the bony structures forming the back of the canal and the25 associated lig~m~nt~ are removed. T_is can lead to the swan neck derol....~y so that although it is a very safe operation and usually quite ~ cliv ;; it can result in swan neck ~rc~ y which is a very difficult problem to correct and which itself causes a lot of discomfort in the neck and shoulders. This is due to the lack of the supporting structures at the back of the vertebrae which normally perform some of the work of 30 keeping the neck in the right shape.
,i The ~ltlorn~tive and increasingly popular way of doing the operation is called alaminoplasty. In this operation the back of the spine is exposed but in~te~(l of the bony structures being removed, they are altered in shape. When the bone has been we~k~ne-l 35 it is bent c ulw~ls opening the canal and providing more room for the spinal cord. The traditional problem has always been to stabilise the lamina in this new position.
~ CA 02231762 1998-03-11 PC~r~ 9 ~ / n o o ~ 6 ~F(~FIVFIl 2 ~ M~Y 1997 One way of stabilising the lamina is to take a bone graft from the hip in the form of a rect~n~ r plate of bone and wedge it in position to try and hold the lamina in its new, more open shape. This is generally effective but because it is not a firm arrangement can lead to some slippage and recurrent narrowing of the spinal canal. It also involves s m~kinp; a separate wound in the area of the hip and taking a bone graft.
It is an object of the present invention to provide a prosthesis device to dynamically stabilise the lamina after laminoplasty.
PRESENT INVENTION
Accordingly the invention consists in a device for dynamically stabilising the lamina of the spine after a laminoplasty comprising spacing means shaped to engage between the severed edges of the lamina and rel~;l,;"~; means attached to said spacing means and shaped to m~int~in the spacing means in an operable position.
This inventiorl also consists in a method of dynamically stabilising reshaped lamina after a larninoplasty comprising the steps of positioning a spacing means betwèen the severed edges of the lamina and posi~ionin,e a retaining means attached to said spacing means to m~int~in the spacing means in an operable position.
The invention consists in the foregoing and also envisages constructions of which the following gives examples only.
DRAWING DESCRIPTION
One preferred form of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is a cross section through the back bone;
Figure 2 is a rear view of a section of the back bone;
Figure 3 is a section of the back bone with modifications made, Figure 4 is a cross section of the back bone illu~ g the modifications made in a laminoplasty;
Figure 5 shows the modified back bone with the device according to the present invention in place;
Figure 6 is a perspective view of a device according to the present invention;
Figure 7 is an elevation of the device according t~ the present invention; and AMENDED SHEET
Ir~
Figure 8 shows a back view with the device fitted in place.
PREFERRED EMBODIMENT
Figures 1 and 2 illustrate a section through a joint in the back bone 1 with the vertebrae 5 body 2, spinal cord 3, lamina 4 and spine 5. Figure 2 shows a rear view of a number of ~,~.tebl~e.
In a laminoplasty a cut 7 is made through the lamina on one side and a we~kPninf~
~oove 8 is f~ nnPIl on the other side. This weakens the bone so that it can be deformed 10 to a position as illustrated in figure 5, but it is necessary to stabilise the deformed l~min~
The present invention provides a stabilising device 9 illustrated in figures 6 and 7 of the acco~ying drawings and shown as fitted in place in figures 5 and 8 of the 15 accolll~ jing drawings. It ~c;l~lt;s in a way that is effective but does not rely on rigid fixation. The device is a subst~nti~lly rect~n~-l~r plate 10 having shouldered lon~itn-lin~l edges 11 and 12. The device can be made from st~inless steel or any other suitable m~tPri~l which will not be rejected by the body. It is proposed to make the device from nylon, tef~on and/or l ;~ .... which will be comr~tible with the MRI scans 20 should such scans need to be done following surgery.
It is neces,s~ry to ensure that the plate 10 is correctly located in place in a way which will avoid or ...il.;..~ise any movement and for this to be achieved simply and effectively in a time effficient way. We have found that the locating device is best 25 achieved by a spring 13 attached with two arms 14 and 15 extçn~lin~Q from therect~n~-l~r plate formed into a spring coil 16 and 17 on each side and then contiml~P~l as a U shaped section 18 joir~ing or comrleting the spring clip with the U shape section 18 in use located behind the spine 5 as is particularly illustrated in figure 5 with the springs 16 and 17 fitting between the vertebrae as illustrated particularly in figure 8.
r 30 As a conseq~lPnce of the present invention it has been possible to reduce the operating ~r time by half and to lessen the theoretical like1ihood of recurrent narrowing of the spine.
Another ~ignific~nt advantage for the patient is a more coll~o.L~ble res..lting neck that is achieved using other known procedures. As a consequential advantage over the need 35 for removing a bone graft from the hip, ~e patient will have no discomfort in the hip which is often the most painful part of the traditional laminoplasty method.
The technique applied in fitting the device uses known means to encourage fusionbetween the device and the cut 1~min~ for example, by placing bone chips obtained from the neck during the laminoplasty around the device. However, * must be appreciated that any spinal operation carries a risk and while we have been veryS confident that the present inven~on will offer an advantage and will not carry any greater risk than other posterior approach to the cervical spine, the design of the present device has been adopted to ...il.;...i~e or elimin~te slippage of the device once its fitted and to fimction so that it will retain ~he enlarged spinal canal. It is considered that the present invention and the teçhnique of applying ~he device l~lcsc~ a ~ignific~nt10 improvement in an area which is medically recognised as requiring particular care bec~lse of the consequences that follow ~om ~l~m~ging the spinal cord.
As a result of these sylll~ s, some people find that their mobility and their ability to 20 undertalce a normal day's work is severely affected. The obvious solution is to make more room for the spinal cord so that the pressure will not happen.
There are two methods of creating more room in the cervical spinal canal. The first is a laminectomy in which the bony structures forming the back of the canal and the25 associated lig~m~nt~ are removed. T_is can lead to the swan neck derol....~y so that although it is a very safe operation and usually quite ~ cliv ;; it can result in swan neck ~rc~ y which is a very difficult problem to correct and which itself causes a lot of discomfort in the neck and shoulders. This is due to the lack of the supporting structures at the back of the vertebrae which normally perform some of the work of 30 keeping the neck in the right shape.
,i The ~ltlorn~tive and increasingly popular way of doing the operation is called alaminoplasty. In this operation the back of the spine is exposed but in~te~(l of the bony structures being removed, they are altered in shape. When the bone has been we~k~ne-l 35 it is bent c ulw~ls opening the canal and providing more room for the spinal cord. The traditional problem has always been to stabilise the lamina in this new position.
~ CA 02231762 1998-03-11 PC~r~ 9 ~ / n o o ~ 6 ~F(~FIVFIl 2 ~ M~Y 1997 One way of stabilising the lamina is to take a bone graft from the hip in the form of a rect~n~ r plate of bone and wedge it in position to try and hold the lamina in its new, more open shape. This is generally effective but because it is not a firm arrangement can lead to some slippage and recurrent narrowing of the spinal canal. It also involves s m~kinp; a separate wound in the area of the hip and taking a bone graft.
It is an object of the present invention to provide a prosthesis device to dynamically stabilise the lamina after laminoplasty.
PRESENT INVENTION
Accordingly the invention consists in a device for dynamically stabilising the lamina of the spine after a laminoplasty comprising spacing means shaped to engage between the severed edges of the lamina and rel~;l,;"~; means attached to said spacing means and shaped to m~int~in the spacing means in an operable position.
This inventiorl also consists in a method of dynamically stabilising reshaped lamina after a larninoplasty comprising the steps of positioning a spacing means betwèen the severed edges of the lamina and posi~ionin,e a retaining means attached to said spacing means to m~int~in the spacing means in an operable position.
The invention consists in the foregoing and also envisages constructions of which the following gives examples only.
DRAWING DESCRIPTION
One preferred form of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is a cross section through the back bone;
Figure 2 is a rear view of a section of the back bone;
Figure 3 is a section of the back bone with modifications made, Figure 4 is a cross section of the back bone illu~ g the modifications made in a laminoplasty;
Figure 5 shows the modified back bone with the device according to the present invention in place;
Figure 6 is a perspective view of a device according to the present invention;
Figure 7 is an elevation of the device according t~ the present invention; and AMENDED SHEET
Ir~
Figure 8 shows a back view with the device fitted in place.
PREFERRED EMBODIMENT
Figures 1 and 2 illustrate a section through a joint in the back bone 1 with the vertebrae 5 body 2, spinal cord 3, lamina 4 and spine 5. Figure 2 shows a rear view of a number of ~,~.tebl~e.
In a laminoplasty a cut 7 is made through the lamina on one side and a we~kPninf~
~oove 8 is f~ nnPIl on the other side. This weakens the bone so that it can be deformed 10 to a position as illustrated in figure 5, but it is necessary to stabilise the deformed l~min~
The present invention provides a stabilising device 9 illustrated in figures 6 and 7 of the acco~ying drawings and shown as fitted in place in figures 5 and 8 of the 15 accolll~ jing drawings. It ~c;l~lt;s in a way that is effective but does not rely on rigid fixation. The device is a subst~nti~lly rect~n~-l~r plate 10 having shouldered lon~itn-lin~l edges 11 and 12. The device can be made from st~inless steel or any other suitable m~tPri~l which will not be rejected by the body. It is proposed to make the device from nylon, tef~on and/or l ;~ .... which will be comr~tible with the MRI scans 20 should such scans need to be done following surgery.
It is neces,s~ry to ensure that the plate 10 is correctly located in place in a way which will avoid or ...il.;..~ise any movement and for this to be achieved simply and effectively in a time effficient way. We have found that the locating device is best 25 achieved by a spring 13 attached with two arms 14 and 15 extçn~lin~Q from therect~n~-l~r plate formed into a spring coil 16 and 17 on each side and then contiml~P~l as a U shaped section 18 joir~ing or comrleting the spring clip with the U shape section 18 in use located behind the spine 5 as is particularly illustrated in figure 5 with the springs 16 and 17 fitting between the vertebrae as illustrated particularly in figure 8.
r 30 As a conseq~lPnce of the present invention it has been possible to reduce the operating ~r time by half and to lessen the theoretical like1ihood of recurrent narrowing of the spine.
Another ~ignific~nt advantage for the patient is a more coll~o.L~ble res..lting neck that is achieved using other known procedures. As a consequential advantage over the need 35 for removing a bone graft from the hip, ~e patient will have no discomfort in the hip which is often the most painful part of the traditional laminoplasty method.
The technique applied in fitting the device uses known means to encourage fusionbetween the device and the cut 1~min~ for example, by placing bone chips obtained from the neck during the laminoplasty around the device. However, * must be appreciated that any spinal operation carries a risk and while we have been veryS confident that the present inven~on will offer an advantage and will not carry any greater risk than other posterior approach to the cervical spine, the design of the present device has been adopted to ...il.;...i~e or elimin~te slippage of the device once its fitted and to fimction so that it will retain ~he enlarged spinal canal. It is considered that the present invention and the teçhnique of applying ~he device l~lcsc~ a ~ignific~nt10 improvement in an area which is medically recognised as requiring particular care bec~lse of the consequences that follow ~om ~l~m~ging the spinal cord.
Claims (7)
1. A device for dynamically stabilising the lamina of the spine after a laminoplasty comprising:
spacing means shaped to engage between the severed edges of the lamina; and retaining means attached to said spacing means and shaped to maintain the spacing means in an operable position.
spacing means shaped to engage between the severed edges of the lamina; and retaining means attached to said spacing means and shaped to maintain the spacing means in an operable position.
2. A device as claimed in claim 1 wherein said spacing means comprises a plate of substantially rectangular configuration.
3. A device as claimed in claim 2 wherein said spacing means is shouldered alongthe longitudinal edges thereof.
4. A device as claimed in any one of the preceding claims wherein said retainingmeans comprises a spring clip having:
two arms extending from the spacing means;
a U-shaped section to engage over the spine; and spring means between the arms and the U-shaped section.
two arms extending from the spacing means;
a U-shaped section to engage over the spine; and spring means between the arms and the U-shaped section.
5. A device as claimed in any one of the preceding claims wherein said device ismade from nylon, teflon and/or titanium.
6. A method of dynamically stabilising reshaped lamina after a laminoplasty comprising the steps of:
positioning a spacing means between the severed edges of the lamina; and positioning a retaining means attached to said spacing means to maintain the spacing means in an operable position.
positioning a spacing means between the severed edges of the lamina; and positioning a retaining means attached to said spacing means to maintain the spacing means in an operable position.
7. A method of dynamically stabilising reshaped lamina after a laminoplasty as claimed in claim 6 wherein said retaining means is positioned to engage over the spine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ272994A NZ272994A (en) | 1995-09-12 | 1995-09-12 | Spinal prosthesis device which stabilises lamina after laminoplasty |
| NZ272994 | 1995-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2231762A1 true CA2231762A1 (en) | 1997-03-20 |
Family
ID=19925426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002231762A Abandoned CA2231762A1 (en) | 1995-09-12 | 1996-09-11 | A device to stabilise the lamina |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6080157A (en) |
| JP (1) | JPH11512314A (en) |
| AU (1) | AU698093C (en) |
| CA (1) | CA2231762A1 (en) |
| DE (1) | DE19681570T1 (en) |
| GB (1) | GB2320198B (en) |
| NZ (1) | NZ272994A (en) |
| WO (1) | WO1997009940A1 (en) |
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| US4611582A (en) * | 1983-12-27 | 1986-09-16 | Wisconsin Alumni Research Foundation | Vertebral clamp |
| US4604995A (en) * | 1984-03-30 | 1986-08-12 | Stephens David C | Spinal stabilizer |
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-
1995
- 1995-09-12 NZ NZ272994A patent/NZ272994A/en unknown
-
1996
- 1996-09-11 AU AU68918/96A patent/AU698093C/en not_active Ceased
- 1996-09-11 DE DE19681570T patent/DE19681570T1/en not_active Withdrawn
- 1996-09-11 CA CA002231762A patent/CA2231762A1/en not_active Abandoned
- 1996-09-11 JP JP9511864A patent/JPH11512314A/en not_active Ceased
- 1996-09-11 GB GB9805311A patent/GB2320198B/en not_active Expired - Fee Related
- 1996-09-11 WO PCT/NZ1996/000096 patent/WO1997009940A1/en active Application Filing
- 1996-09-11 US US09/043,235 patent/US6080157A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11512314A (en) | 1999-10-26 |
| GB2320198A (en) | 1998-06-17 |
| DE19681570T1 (en) | 1998-12-10 |
| GB2320198B (en) | 1999-12-01 |
| GB9805311D0 (en) | 1998-05-06 |
| US6080157A (en) | 2000-06-27 |
| AU698093B2 (en) | 1998-10-22 |
| NZ272994A (en) | 2001-06-29 |
| AU6891896A (en) | 1997-04-01 |
| WO1997009940A1 (en) | 1997-03-20 |
| AU698093C (en) | 2001-09-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |