CA1224602A - Amputation assembly - Google Patents
Amputation assemblyInfo
- Publication number
- CA1224602A CA1224602A CA000465470A CA465470A CA1224602A CA 1224602 A CA1224602 A CA 1224602A CA 000465470 A CA000465470 A CA 000465470A CA 465470 A CA465470 A CA 465470A CA 1224602 A CA1224602 A CA 1224602A
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- CA
- Canada
- Prior art keywords
- cap
- plate
- stump
- bone
- amputation
- 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
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Abstract
AMPUTATION APPARATUS
ABSTRACT OF THE DISCLOSURE
Amputation apparatus for use with an internal prosthesis attachable to the end of a stump having an out-wardly extending bone. The amputation apparatus includes a cap having an internal cavity for insertion over the bone and an opposed outwardly extending boss. A plate having an internal cavity is mountable over the outwardly extending boss of the cap. The plate has a radial extent substan-tially greater than the radial extent of the cap to define an equal weight distribution surface for internal and exter-nal forces over the entire bottom surface of the stump.
ABSTRACT OF THE DISCLOSURE
Amputation apparatus for use with an internal prosthesis attachable to the end of a stump having an out-wardly extending bone. The amputation apparatus includes a cap having an internal cavity for insertion over the bone and an opposed outwardly extending boss. A plate having an internal cavity is mountable over the outwardly extending boss of the cap. The plate has a radial extent substan-tially greater than the radial extent of the cap to define an equal weight distribution surface for internal and exter-nal forces over the entire bottom surface of the stump.
Description
AMPUTAT I ON APPARATUS
BACKGROUND OF THE INVENTION
____________________ ______ This invention relhtes, in general, to prosthes~s which are externally attachable to severed or amputated limbs and, more specifically, to apparatus for use in attaching prostheses to limbs.
It is common to attach a prosthesis or artificial limb externally onto a limb of an individual which has been amputated or otherwise severed in order to provide a measure of use of the l;mb to the individual. Typically, a strap and harness assembly is utili~ed which engages the stump of the limb. During use of the weight bearing limb, such as a leg or arm, forces are ~enerated which are transmitted through the prosthesis directly to the flesh surrounding the stump. Since it is difficult to insure a secure, non-slip engagement between the prosthesis and the stump, the forces generated during use of the prosthesis create movement of the prosthesis relative to the stump which results in irri-tation of the flesh surrounding the stump and discomfort to the wearer which makes it difficult, if not impossible, to effectively use the prosthesis in a normal manner.
One solution to the above-listed problems is set forth in U S Patent Number 3,947,897. In this device, a socket is inserted directly into a cavity of the bone at the end of the stump. The prosthesis is contoured to the shape of the stump and includes a lock pin insertable within the socket for releasably mounting the prosthesis to the socket and stump.
As shown in U.S. Patent Numbers 2,578,019 and 3,186,006, it has nlso proposed to employ cushions or pnds ~2~
which are disposed between the end of the stump and the prosthesis to absorb and ~ushion some of the forces and pressures transmitted from the prosthesis to the stump.
While the abovc-described devices reduce to a cer-tain extent some of the forces transmitted to the stump and thereby ease some of the discomfort typically encountered with the use of a prosthesis, such devices fail to evenly distribllte the forces over the entire end of the stump such that directional forces still cause pressures to be exerted on the stump resulting in discomfort to the user.
Thus, it would be desirable to provide an amputa-tion apparatus which overcomes the problems of previously devised devices for use with a prosthesis attached exter-nally to a severed or amputated limb. It would also be desirable to provide an nmputation apparatus which evenly distributes the forces exerted by the prosthesis over the end of the stump to reduce the discomfort caused by such forces. Finally, it would be desirable to provide an ampu-tation apparatus which is available in a variety of sizes for use on different size individuals, from adults to children, and also to allow for bone and/or flesh growth and changes in the shape and size of the limb itself.
The present invention is an amputation apparatus for use with an external prosthesis attachable to the end of a severed limb or stump. The amputation apparatus includes a cap having first and second ends, with a cavity formed in the first end and a boss or projection extending outwardly from the second end. The cavity in the first end of the cap is insertable over the end of the bone in the stump and secured thoreto, prefer~bly by use o~ a bio-compQtible ndhesive.
~2~L6~
~ plate has a top and bottom surface, with a cavity formed in the top surface which is interconnectable with the plug or boss on the cap. A bio-compatible adhesive is uti-lized to secure the interconnected plug and cavity together so as to securel~ mount the plate on the cap. The plate is shaped with nn outer periphery, either circular or oval in configuration, which has a substantially greater radius than the radius of the outer periphery of the cap.
With the plate securely mounted on the cap, a loose strip of skin or skin and muscle is pulled over and wrapped about the bottom surface of the plate and sutured to the opposite side of the stump. A cinch strap is secured about the stump above the plate~ A bandage basket is also mounted over the stump during the healing of the skin tissue.
In an alternate embodiment, the amputation appara-tus of the present invention is adapted for use on pre-adult individuals in which subsequent bone and tissue growth will occur. In this embodiment, the amputation apparatus is removably secured to a mesh member which is sutured to the muscle proximal the end of the stump. In this manner, the cap and plate assembly may be removed and replaced with a larger size cap and plate assembly when bone and tissue growth occurs.
The arnputation apparatus of the present invention overcomes many of the problems encountered with previously devised apparatus and methods for attaching prosthesis to stumps. The amputation apparatus of the present invention uniquely distributes forces and pressures transmitted from the prosthesis during its use to the stump in an equnl 30 manrler OVel' the entire bottom surface of the stump.
~2~
Furthermore9 the amputation apparatus distributes body weight pressure evenly across the stump thus preventing internal stump damage caused by limb and/or body weight pressure being borne solely on the bone end. The plate and cap prevent contact between the bone end and the surrounding tissue thereby preventing tissue damage caused by grinding of the bone end into the tissue. This provides greater com-fort for the user of the prosthesis and prevents irritation of the flesh surrounding the stump during use of the prosthesis.
The various features, advantages and other uses of the present invention will become more apparent by referring to the following detailed description and drawing in which:
Figure 1 is an exploded, perspective view of an amputation apparatus constructed in accordance with the teachings of the present invention;
Figure 2 is a side elevational view of another embodiment of the plate utilized in the amputation apparatus of the present invention;
Figure 3 is a side elevational view of yet another embodiment of the plate utilized in the amputation apparatus of the present invention;
Figure 4 is a perspective view of the bottom of the plate utilized in the amputation apparatus of the present invention showing the construction of the spaced ribs;
Figure 5 is an exploded, partially sectioned view showing the mounting of the amputation apparatus of the pre-sent invention externally on the end of the stump; and Figure 6 is a partial, exploded view showing the mounting of nnother embodiment of the amputation apparatus ~LZ~ (32 of the present invention on the end of a stump of a pre-adult.
Throughout the following description and drawing, ~n identicnl reference number is used to refer to the same component shown in multiple figures of the drawing.
Referring now to the drawing, there is illustrated an amputation apparatus 10 which is used with a prosthesis mountable externally on the end of a stump of a severed or amputated limb to evenly distribute forces transmitted by the prosthesis across the stump and internally through the bone end.
As shown in Figure 1, the amputation apparatus 10 includes a cap 12 and a plate 14. The cap is formed of a body member constructed of a neutral, bio-compatible material. The cap 12 typically has a circular cross-section and is formed with first and second portions 16 and 18, respectivel~, having different cross-sections or diameters.
The cap 12 is also provided with first and second opposed ends 20 and 22, respectively.
A recess or internal cavity 24 is formed in the first end 20 of the first portion 16 of the cap 12. The cavity 24 extends partially through the first portion 16 of the cap 12, as shown in Figure 1 and, preferably, has a cir-cular cross-section.
The second portion 18 of the cap 12, which has a smaller diameter or cross-section than that of the first portion 16 of the cap 12, defines a boss or projection which extends outward from the end of the first portion 16 of the cap 12. The outor end of the second portion or boss 18 d~finos tho socond end 22 of tho cap 12.
The cap 12 of the present invention may be formed in a vuriety of sizes corresponding to minimal O.D., so as to enable its use on a variety of different sized indivi-duals and to allow removal and exchange of the cap 12 for bone and tissue growth during the life of the user.
Furthermore, the boss 18 and cavity 24 may have different diameters than that illustrated in Figure I to accomodate varying plate sizes, described hereafter, as well as dif-ferent stump diameters.
As shown in Figure 1, a plurality of elevator mem-bers 26 are removably insertable within the cavity 24 within the cap 12. The elevator members 26 are circular discs having a cross-section equal to the cross-section of the cavity 24. Any number of elevators 26 may be inserted within the cavity 24 in the cap 12 to permit variation in the attachment of the cap 20 on the end of the bone of the stump, as described and illustrated hereafter.
The amputation apparatus 10 of the present inven-tion also includes a plate 14 in the form of a thin body formed of a neutral, bio-compatible material. The plate 14 is formed with opposed, top and bottom surfaces 3~ and 32, respectively. Preferably, the plate has a cup-like con-figuration including an upwardly extending side wall 34.
Preferably, the side wall 34 is formed with rounded or smooth corners to prevent tissue damage when the plate 14 is mounted on the end of a stump of a severed or amputated leg.
As shown in Figure 1, the radial extent of the periphery of the plate 14 is substantially greater than the corresponding radial extent of the periphery of the cnp 12 such that thc side wall 34 of the plate 14 e~tends a substantial radial distance outward beyond the outer peripheral surface of the cap 12 so as to define a large weight bearing surface. The plate 14 may be formed in any desired conf igurAt ion, although circular or oval con-figurations are preferred.
A cavity or recess 36 is formed in the plate 14 and has a diameter which mates with the boss 18 on the cap 12 so as to snugly be inserted over the periphery of the boss 18.
In the embodiments shown in Figures 1 and 2, a second boss or projection 3~ is formed integrally with and extends upward from the top surface 30 of the plate 1~ above the upper end of the side wall 34. The internal cavity 36 is formed within the boss 38 and, in one embodiment shown in Figure 1, extends through a portion of the depth of the boss 38. In a second embodiment illustrated in Figure 2, the internal cavity 36' extends through the entire length of the boss 38 into the interior of the plate 14. Alternate}y, as shown in Figure 3, the boss 38' may extend upward only a portion of the height of the side wall 34 of the plate 14.
As shown in Figures 1-4, rib means 40 are formed on the plate 14. The rib means 40 functions to provide a holding surface for the surrounding skin and tissue after the plate 14 is installed upon an end of a stump to securely hold the plate 14 in position on the end of the stump and to provide space for post-operative tissue swelling.
In a preferred embodiment, the rib means 40 com-prises a plurality of concentric, annular ribs, such as ribs 41, 42 and 43, which are integrally formed on the plate 14.
As shown in Figures 1-4, the ribs 41, 42 nnd 43 comprises corrug~tions formed in the plate 1~ which encircle the boss 38. Alternately, the rib means 40 may comprise a plurality of annular flanges mounted on the top and/or bottom surfaces 30 and 32 of the plate 14.
As shown in Figure 5, the amputation apparatus 10 of the present invention is adapted to be disposed over and connected to the end of the bone 50 located at the end of a stump 52 of a severed or amputated limb. The cap 12 is inserled directl~ over the end of the exteriorally extending, exposed portion of the bone 50 with the internal cavity 24 formed in the first end 20 of the cap 12 snugly engaging the bone 50.
Securing means, such as a bio-compatible adhesive, is disposed between the mating surfaces of the cavity 24 and the bone 50 so as to securely mount the cap 12 of the end of the bone 50.
The plate 14 is then mounted directly on the out-wardly extending plug or boss 18 on the cap 12. In so doing, the internal cavity 36 on the plate 14 is disposed directly over the plug or boss 18 on the cap 12 and secured theretc by a suitable adhesive. In this way, the cap 12 and plate 14 are securely mounted on the bone 50.
Prior to the installation of the amputation appara-tus 10 of the present invention on the end of a bone on a stump, the stump 50 is prepared for attachment of the ampu-tation apparatus 10. An incision is made through the skin which is separated from the muscles and peeled back to a point approximately two times the diameter of the plate 14 above the end of the bone 50. The muscles are then excised around the bone 50 and the bone erld itself is cleaned. The cap 12 i8 thcn mounted in position and bonded to the end of the bone 50. Next, the plate 1~ is securely mounted to the cap 12, as described above.
The skin 54 from one side of the stump 52 is then brought down and across the bottom surface 32 of the plate 14 and up to the opposed side 56 of the stump 52. The skin portion 54 may be selected from either the front or back of the stump 52, as well as from either the left or right sides of the stump 52.
A cinch strap 57 in the form of an elongated strip member is secured about the stump 52 above the plate 14.
The cinch strap 57 draws the skin in around the bone 50 and the cap area, as shown in phantom in Figure 5, to f~cilitate the attachment of an external device or prosthesis. Any excess skin folds created by the cinching may be surgically excised to further enhance the fit of an external device and/or prosthesis.
As shown in Figure 5, a bandage basket 66 con-taining bandages or to hold bandages, not shown, disposed about the stump 52 is then mounted over the end of the stump 52. The bandage basket 66 is formed of a flexible, large-opening, weaved container having an open top end 68. The configuration or cross-section of the bandage basket 68 is compatible with that of the plate 14 and may be either cir-cular or oval in cross-section. Two flexible hanger straps 70 and 72 mounted on the basket 66 are criss-crossed in front of the basket 66 and interconnected by means of a pin 'l4 attached to the bandage basket 66, to securely hold the basket 66 in position on the stump 52 during the skin and tissue healing process.
After the skin has properly healed, the bandage basket 66 and cinch strap 57 are removed from the stump 52 _g _ 6~1Z
and a suitable prosthesis or other external device, not shown, can then be mounted on the stump 52.
During use of the prosthesis, the plate 14, which defines a large weight bearing surface at the end of the bone 50 of the stump 52, will evenly distribute forces transmitted by the prosthesis over the entire bottom surface of the bone 50 and the stump 52~ This has the effect of equally distributing such forces so as to prevent any inter-nal or external directional forces from being urged on the stump 52 which could cause discomfort to the user.
Referring now to Figure 6, there is illustrated an alternate embodiment of the amputation apparatus of the pre-sent invention. In this embodiment, the amputation appara-tus 80 is shown mounted on the end of the stump of a pre-adult individual in which future bone and tissue growth will occur. The amputation apparatus 80 includes a member 82 formed of a mesh-like material which is sutured to the muscle surrounding the end of the stump. An outer layer 85 is provided on the mesh member 82 and includes a hole pat-tern 84 which provides a location for sutures used to attach the mesh member 82 to the muscle.
The mesh member 82 includes a lower centrallg located depending portion 86 which is adapted to releasably receive the cap thereon, as described hereafter.
The amputation apparatus 80 also includes a cap 88 and a plate 90. The cap 90 is formed of a su;tab}e bio-compatible metallic material and has a circular cross-section with a first recess or cavity 92 formed at an upper end. A layer of a compressable material 9~ is disposed interiorally within the fir~t recess 92 nnd is ndnpted to --l 0~
~ 2 surround and engage the end of the bone of the stump. A
boss or projection 96 is formed on the second end of the cap 88 for receiving the plate 90 thereon, in the same manner as described and illustrated above for the amputation apparatus 10.
The plate assembly 90 is identically formed as that illustrated in Figure 1 such that a detailed description wil} not now be provided. It will be understood, however, that the plate 90 is secured to the boss 96 on the cap 88 bg means of an adhesive as described above.
The cap 88 is releasably secured to the bottom end 86 of the mesh member 82 by means of a cable connector 98 which is releasably insertable into arcuate~ depending figures 100 formed at the upper end of the cap 88.
Insertion of the cable connector 98 within the interior of the depending figures 100 secures the cap 88 to the depending end 86 of the mesh member 82 to thereby securely and releasably mount the amputation apparatus 80 of the pre-sent invention on the end of the bone of the stump. When bone and tissue growth occurs the cable 98 may be removed so as to detach the plate 90 and cap 88 from the end of the bone of the stump and allow the installation of a larger sized cap and plate assembly.
In summary7 there has been disclosed a unigue ampu-tation apparatus which evenly distributes internal and external forces across the entire bottom surface of the stump. The amputation apparatus of the present invention is easily installed and secured on the end of the bone in the stump. The amputation npparatus of the present invention may, also, be provided in a variety of sizes so RS to ennble its application on many different sized individuals, a5 well as replacement to allow for bone and tissue growth.
BACKGROUND OF THE INVENTION
____________________ ______ This invention relhtes, in general, to prosthes~s which are externally attachable to severed or amputated limbs and, more specifically, to apparatus for use in attaching prostheses to limbs.
It is common to attach a prosthesis or artificial limb externally onto a limb of an individual which has been amputated or otherwise severed in order to provide a measure of use of the l;mb to the individual. Typically, a strap and harness assembly is utili~ed which engages the stump of the limb. During use of the weight bearing limb, such as a leg or arm, forces are ~enerated which are transmitted through the prosthesis directly to the flesh surrounding the stump. Since it is difficult to insure a secure, non-slip engagement between the prosthesis and the stump, the forces generated during use of the prosthesis create movement of the prosthesis relative to the stump which results in irri-tation of the flesh surrounding the stump and discomfort to the wearer which makes it difficult, if not impossible, to effectively use the prosthesis in a normal manner.
One solution to the above-listed problems is set forth in U S Patent Number 3,947,897. In this device, a socket is inserted directly into a cavity of the bone at the end of the stump. The prosthesis is contoured to the shape of the stump and includes a lock pin insertable within the socket for releasably mounting the prosthesis to the socket and stump.
As shown in U.S. Patent Numbers 2,578,019 and 3,186,006, it has nlso proposed to employ cushions or pnds ~2~
which are disposed between the end of the stump and the prosthesis to absorb and ~ushion some of the forces and pressures transmitted from the prosthesis to the stump.
While the abovc-described devices reduce to a cer-tain extent some of the forces transmitted to the stump and thereby ease some of the discomfort typically encountered with the use of a prosthesis, such devices fail to evenly distribllte the forces over the entire end of the stump such that directional forces still cause pressures to be exerted on the stump resulting in discomfort to the user.
Thus, it would be desirable to provide an amputa-tion apparatus which overcomes the problems of previously devised devices for use with a prosthesis attached exter-nally to a severed or amputated limb. It would also be desirable to provide an nmputation apparatus which evenly distributes the forces exerted by the prosthesis over the end of the stump to reduce the discomfort caused by such forces. Finally, it would be desirable to provide an ampu-tation apparatus which is available in a variety of sizes for use on different size individuals, from adults to children, and also to allow for bone and/or flesh growth and changes in the shape and size of the limb itself.
The present invention is an amputation apparatus for use with an external prosthesis attachable to the end of a severed limb or stump. The amputation apparatus includes a cap having first and second ends, with a cavity formed in the first end and a boss or projection extending outwardly from the second end. The cavity in the first end of the cap is insertable over the end of the bone in the stump and secured thoreto, prefer~bly by use o~ a bio-compQtible ndhesive.
~2~L6~
~ plate has a top and bottom surface, with a cavity formed in the top surface which is interconnectable with the plug or boss on the cap. A bio-compatible adhesive is uti-lized to secure the interconnected plug and cavity together so as to securel~ mount the plate on the cap. The plate is shaped with nn outer periphery, either circular or oval in configuration, which has a substantially greater radius than the radius of the outer periphery of the cap.
With the plate securely mounted on the cap, a loose strip of skin or skin and muscle is pulled over and wrapped about the bottom surface of the plate and sutured to the opposite side of the stump. A cinch strap is secured about the stump above the plate~ A bandage basket is also mounted over the stump during the healing of the skin tissue.
In an alternate embodiment, the amputation appara-tus of the present invention is adapted for use on pre-adult individuals in which subsequent bone and tissue growth will occur. In this embodiment, the amputation apparatus is removably secured to a mesh member which is sutured to the muscle proximal the end of the stump. In this manner, the cap and plate assembly may be removed and replaced with a larger size cap and plate assembly when bone and tissue growth occurs.
The arnputation apparatus of the present invention overcomes many of the problems encountered with previously devised apparatus and methods for attaching prosthesis to stumps. The amputation apparatus of the present invention uniquely distributes forces and pressures transmitted from the prosthesis during its use to the stump in an equnl 30 manrler OVel' the entire bottom surface of the stump.
~2~
Furthermore9 the amputation apparatus distributes body weight pressure evenly across the stump thus preventing internal stump damage caused by limb and/or body weight pressure being borne solely on the bone end. The plate and cap prevent contact between the bone end and the surrounding tissue thereby preventing tissue damage caused by grinding of the bone end into the tissue. This provides greater com-fort for the user of the prosthesis and prevents irritation of the flesh surrounding the stump during use of the prosthesis.
The various features, advantages and other uses of the present invention will become more apparent by referring to the following detailed description and drawing in which:
Figure 1 is an exploded, perspective view of an amputation apparatus constructed in accordance with the teachings of the present invention;
Figure 2 is a side elevational view of another embodiment of the plate utilized in the amputation apparatus of the present invention;
Figure 3 is a side elevational view of yet another embodiment of the plate utilized in the amputation apparatus of the present invention;
Figure 4 is a perspective view of the bottom of the plate utilized in the amputation apparatus of the present invention showing the construction of the spaced ribs;
Figure 5 is an exploded, partially sectioned view showing the mounting of the amputation apparatus of the pre-sent invention externally on the end of the stump; and Figure 6 is a partial, exploded view showing the mounting of nnother embodiment of the amputation apparatus ~LZ~ (32 of the present invention on the end of a stump of a pre-adult.
Throughout the following description and drawing, ~n identicnl reference number is used to refer to the same component shown in multiple figures of the drawing.
Referring now to the drawing, there is illustrated an amputation apparatus 10 which is used with a prosthesis mountable externally on the end of a stump of a severed or amputated limb to evenly distribute forces transmitted by the prosthesis across the stump and internally through the bone end.
As shown in Figure 1, the amputation apparatus 10 includes a cap 12 and a plate 14. The cap is formed of a body member constructed of a neutral, bio-compatible material. The cap 12 typically has a circular cross-section and is formed with first and second portions 16 and 18, respectivel~, having different cross-sections or diameters.
The cap 12 is also provided with first and second opposed ends 20 and 22, respectively.
A recess or internal cavity 24 is formed in the first end 20 of the first portion 16 of the cap 12. The cavity 24 extends partially through the first portion 16 of the cap 12, as shown in Figure 1 and, preferably, has a cir-cular cross-section.
The second portion 18 of the cap 12, which has a smaller diameter or cross-section than that of the first portion 16 of the cap 12, defines a boss or projection which extends outward from the end of the first portion 16 of the cap 12. The outor end of the second portion or boss 18 d~finos tho socond end 22 of tho cap 12.
The cap 12 of the present invention may be formed in a vuriety of sizes corresponding to minimal O.D., so as to enable its use on a variety of different sized indivi-duals and to allow removal and exchange of the cap 12 for bone and tissue growth during the life of the user.
Furthermore, the boss 18 and cavity 24 may have different diameters than that illustrated in Figure I to accomodate varying plate sizes, described hereafter, as well as dif-ferent stump diameters.
As shown in Figure 1, a plurality of elevator mem-bers 26 are removably insertable within the cavity 24 within the cap 12. The elevator members 26 are circular discs having a cross-section equal to the cross-section of the cavity 24. Any number of elevators 26 may be inserted within the cavity 24 in the cap 12 to permit variation in the attachment of the cap 20 on the end of the bone of the stump, as described and illustrated hereafter.
The amputation apparatus 10 of the present inven-tion also includes a plate 14 in the form of a thin body formed of a neutral, bio-compatible material. The plate 14 is formed with opposed, top and bottom surfaces 3~ and 32, respectively. Preferably, the plate has a cup-like con-figuration including an upwardly extending side wall 34.
Preferably, the side wall 34 is formed with rounded or smooth corners to prevent tissue damage when the plate 14 is mounted on the end of a stump of a severed or amputated leg.
As shown in Figure 1, the radial extent of the periphery of the plate 14 is substantially greater than the corresponding radial extent of the periphery of the cnp 12 such that thc side wall 34 of the plate 14 e~tends a substantial radial distance outward beyond the outer peripheral surface of the cap 12 so as to define a large weight bearing surface. The plate 14 may be formed in any desired conf igurAt ion, although circular or oval con-figurations are preferred.
A cavity or recess 36 is formed in the plate 14 and has a diameter which mates with the boss 18 on the cap 12 so as to snugly be inserted over the periphery of the boss 18.
In the embodiments shown in Figures 1 and 2, a second boss or projection 3~ is formed integrally with and extends upward from the top surface 30 of the plate 1~ above the upper end of the side wall 34. The internal cavity 36 is formed within the boss 38 and, in one embodiment shown in Figure 1, extends through a portion of the depth of the boss 38. In a second embodiment illustrated in Figure 2, the internal cavity 36' extends through the entire length of the boss 38 into the interior of the plate 14. Alternate}y, as shown in Figure 3, the boss 38' may extend upward only a portion of the height of the side wall 34 of the plate 14.
As shown in Figures 1-4, rib means 40 are formed on the plate 14. The rib means 40 functions to provide a holding surface for the surrounding skin and tissue after the plate 14 is installed upon an end of a stump to securely hold the plate 14 in position on the end of the stump and to provide space for post-operative tissue swelling.
In a preferred embodiment, the rib means 40 com-prises a plurality of concentric, annular ribs, such as ribs 41, 42 and 43, which are integrally formed on the plate 14.
As shown in Figures 1-4, the ribs 41, 42 nnd 43 comprises corrug~tions formed in the plate 1~ which encircle the boss 38. Alternately, the rib means 40 may comprise a plurality of annular flanges mounted on the top and/or bottom surfaces 30 and 32 of the plate 14.
As shown in Figure 5, the amputation apparatus 10 of the present invention is adapted to be disposed over and connected to the end of the bone 50 located at the end of a stump 52 of a severed or amputated limb. The cap 12 is inserled directl~ over the end of the exteriorally extending, exposed portion of the bone 50 with the internal cavity 24 formed in the first end 20 of the cap 12 snugly engaging the bone 50.
Securing means, such as a bio-compatible adhesive, is disposed between the mating surfaces of the cavity 24 and the bone 50 so as to securely mount the cap 12 of the end of the bone 50.
The plate 14 is then mounted directly on the out-wardly extending plug or boss 18 on the cap 12. In so doing, the internal cavity 36 on the plate 14 is disposed directly over the plug or boss 18 on the cap 12 and secured theretc by a suitable adhesive. In this way, the cap 12 and plate 14 are securely mounted on the bone 50.
Prior to the installation of the amputation appara-tus 10 of the present invention on the end of a bone on a stump, the stump 50 is prepared for attachment of the ampu-tation apparatus 10. An incision is made through the skin which is separated from the muscles and peeled back to a point approximately two times the diameter of the plate 14 above the end of the bone 50. The muscles are then excised around the bone 50 and the bone erld itself is cleaned. The cap 12 i8 thcn mounted in position and bonded to the end of the bone 50. Next, the plate 1~ is securely mounted to the cap 12, as described above.
The skin 54 from one side of the stump 52 is then brought down and across the bottom surface 32 of the plate 14 and up to the opposed side 56 of the stump 52. The skin portion 54 may be selected from either the front or back of the stump 52, as well as from either the left or right sides of the stump 52.
A cinch strap 57 in the form of an elongated strip member is secured about the stump 52 above the plate 14.
The cinch strap 57 draws the skin in around the bone 50 and the cap area, as shown in phantom in Figure 5, to f~cilitate the attachment of an external device or prosthesis. Any excess skin folds created by the cinching may be surgically excised to further enhance the fit of an external device and/or prosthesis.
As shown in Figure 5, a bandage basket 66 con-taining bandages or to hold bandages, not shown, disposed about the stump 52 is then mounted over the end of the stump 52. The bandage basket 66 is formed of a flexible, large-opening, weaved container having an open top end 68. The configuration or cross-section of the bandage basket 68 is compatible with that of the plate 14 and may be either cir-cular or oval in cross-section. Two flexible hanger straps 70 and 72 mounted on the basket 66 are criss-crossed in front of the basket 66 and interconnected by means of a pin 'l4 attached to the bandage basket 66, to securely hold the basket 66 in position on the stump 52 during the skin and tissue healing process.
After the skin has properly healed, the bandage basket 66 and cinch strap 57 are removed from the stump 52 _g _ 6~1Z
and a suitable prosthesis or other external device, not shown, can then be mounted on the stump 52.
During use of the prosthesis, the plate 14, which defines a large weight bearing surface at the end of the bone 50 of the stump 52, will evenly distribute forces transmitted by the prosthesis over the entire bottom surface of the bone 50 and the stump 52~ This has the effect of equally distributing such forces so as to prevent any inter-nal or external directional forces from being urged on the stump 52 which could cause discomfort to the user.
Referring now to Figure 6, there is illustrated an alternate embodiment of the amputation apparatus of the pre-sent invention. In this embodiment, the amputation appara-tus 80 is shown mounted on the end of the stump of a pre-adult individual in which future bone and tissue growth will occur. The amputation apparatus 80 includes a member 82 formed of a mesh-like material which is sutured to the muscle surrounding the end of the stump. An outer layer 85 is provided on the mesh member 82 and includes a hole pat-tern 84 which provides a location for sutures used to attach the mesh member 82 to the muscle.
The mesh member 82 includes a lower centrallg located depending portion 86 which is adapted to releasably receive the cap thereon, as described hereafter.
The amputation apparatus 80 also includes a cap 88 and a plate 90. The cap 90 is formed of a su;tab}e bio-compatible metallic material and has a circular cross-section with a first recess or cavity 92 formed at an upper end. A layer of a compressable material 9~ is disposed interiorally within the fir~t recess 92 nnd is ndnpted to --l 0~
~ 2 surround and engage the end of the bone of the stump. A
boss or projection 96 is formed on the second end of the cap 88 for receiving the plate 90 thereon, in the same manner as described and illustrated above for the amputation apparatus 10.
The plate assembly 90 is identically formed as that illustrated in Figure 1 such that a detailed description wil} not now be provided. It will be understood, however, that the plate 90 is secured to the boss 96 on the cap 88 bg means of an adhesive as described above.
The cap 88 is releasably secured to the bottom end 86 of the mesh member 82 by means of a cable connector 98 which is releasably insertable into arcuate~ depending figures 100 formed at the upper end of the cap 88.
Insertion of the cable connector 98 within the interior of the depending figures 100 secures the cap 88 to the depending end 86 of the mesh member 82 to thereby securely and releasably mount the amputation apparatus 80 of the pre-sent invention on the end of the bone of the stump. When bone and tissue growth occurs the cable 98 may be removed so as to detach the plate 90 and cap 88 from the end of the bone of the stump and allow the installation of a larger sized cap and plate assembly.
In summary7 there has been disclosed a unigue ampu-tation apparatus which evenly distributes internal and external forces across the entire bottom surface of the stump. The amputation apparatus of the present invention is easily installed and secured on the end of the bone in the stump. The amputation npparatus of the present invention may, also, be provided in a variety of sizes so RS to ennble its application on many different sized individuals, a5 well as replacement to allow for bone and tissue growth.
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An amputation apparatus for use with a prosthesis attachable externally to a stump having a bone, the amputation apparatus comprising: a cap securable to the end of the bone in the stump, the cap having an open top, a bottom and side walls sized to fit externally over the end of the bone; and a plate disposable completely internally within the stump and attachable to the cap, the plate extending radially outward a substantial distance beyond the outer periphery of the cap to define a large weight bearing surface at the end of the bone to evenly distri-bute forces over the entire end of the stump.
2. The amputation apparatus of claim 1 further in-cluding: means for interconnecting the cap and the plate, the interconnecting means comprising mating interconnecting por-tions formed on the cap and the plate; and means for securing the mating portions of the cap and plate together.
3. The amputation apparatus of claim 2 wherein the means for securing the mating portions of the cap and plate together comprises adhesive means.
4. The amputation apparatus of claim 2 wherein the bottom of the cap is formed as an outwardly extending boss; and an internal cavity is centrally formed within the plate and adapted to be disposed externally over the outwardly extending boss on the cap.
5. The amputation apparatus of claim 4 wherein the boss on the cap and the internal cavity in the plate have matingly formed circular cross-sections.
6. The amputation apparatus of claim 4 wherein the plate includes a centrally located boss extending upward from the plate, the plate boss\having the internal cavity formed therein.
7. The amputation apparatus of claim 1 wherein the plate has a circular cross-section.
8. The amputation apparatus of claim 1 wherein the plate has an oval configuration.
9. The amputation apparatus of claim 1 further in-cluding rib means formed integral in the plate.
10. The amputation apparatus of claim 9 wherein the rib means comprises at least one annular rib.
11. The amputation apparatus of claim 9 wherein the rib means comprises a plurality of concentric corrugations formed in the plate.
12. An amputation apparatus for use with an external prosthesis attachable to a stump having a bone, the amputation apparatus comprising: a cap having first and second portions, the second portion having a smaller diameter than the first portion which defines an outwardly extending boss on the cap, an internal cavity formed in the cap sized to fit externally over the end of the bone; a plate having top and bottom surfaces and a centrally located boss formed on the top surface, the plate extending radially outward a substantial distance beyond the periphery of the cap to evenly distribute forces from the prosthesis over the end of the stump, the plate being disposed completely internally within the stump; a first cavity formed within the boss on the plate for insertion over the boss on the cap; first adhesive means for securing the cap and plate to-gether; and second adhesive means for securing the cap on the bone.
13. The amputation of claim 12 further including a plurality of concentric ribs integrally formed on the plate.
14. An amputation apparatus for use with an external prosthesis attachable to a stump having abone, the amputation apparatus comprising: a mesh member securable to the tissue surrounding the bone at the end of the stump, the mesh member including a depending lower end portion; a cap having first and second portions, the second portion having a smaller diameter than the first portion which defines an outwardly extending boss on the cap, the cap having an internal cavity formed on the end of the first portion for external insertion about the bone: a cable connector removably receivable within the depending flanges on the cap to releasably mount the cap on the depending lower end portion of the mesh member; and a plate having top and bottom surfaces and a centrally located boss formed on a top surface, the plate extending radially outward a substantial dis-tance from the periphery of the cap to evenly distribute forces from the prosthesis over the end of the stump, the plate being disposed completely internally within the stump, a first cavity formed within a boss on the plate for insertion over the boss on the cap; and adhesive means for securing the cap and plate together.
15. The amputation apparatus of claim l further including a layer of compressible material disposed within the cavity in the cap for surrounding the end of the bone of the stump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000465470A CA1224602A (en) | 1984-10-15 | 1984-10-15 | Amputation assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000465470A CA1224602A (en) | 1984-10-15 | 1984-10-15 | Amputation assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1224602A true CA1224602A (en) | 1987-07-28 |
Family
ID=4128922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000465470A Expired CA1224602A (en) | 1984-10-15 | 1984-10-15 | Amputation assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1224602A (en) |
-
1984
- 1984-10-15 CA CA000465470A patent/CA1224602A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |