PROSTHETIC ADAPTER MODULE

Abstract

An adapter module (2) configured to be attached, by a predetermined number of screws (4), to a socket member (6) of a prosthetic sleeve (8), into which sleeve (8) an amputation stump of a prosthesis user is to be inserted. The adapter module (2) comprises a module body (10) provided with a washer space (12) structured to provide room for a disc-shaped connection washer (14), the washer space (12) has an extension to provide for movement of the connection washer (14) within a plane essentially perpendicular to a longitudinal axis A of said prosthetic sleeve (8) prior the connection washer (14) is fixated in a determined position. The connection washer (14) is provided with a through-going first opening (16) structured to receive a washer attachment screw (18) such that the screw essentially extends along said longitudinal axis A. The through-going first opening (16) is preferably positioned off-centered of the washer (14) in order to maximize movement of the washer in all directions within the plane.

Claims

1. An adapter module configured to be attached, by a predetermined number of screws, to a socket member of a prosthetic sleeve, into which sleeve an amputation stump of a prosthesis user is to be inserted, the adapter module comprising a module body provided with a washer space structured to provide room for a disc-shaped connection washer, the washer space having an extension to provide for movement of the connection washer within a plane essentially perpendicular to a longitudinal axis of said prosthetic sleeve prior the connection washer being fixated in a determined position, and the connection washer being provided with a through-going first opening structured to receive a washer attachment screw such that the screw essentially extends along said longitudinal axis.

2. The adapter module according to claim 1, wherein said washer attachment screw extends in a direction away from the amputation stump.

3. The adapter module according to claim 1, wherein the through-going first opening is positioned off-centered of the washer in order to maximize lateral movement of the washer in all directions within the plane.

4. The adapter module according to claim 1, wherein the module body is provided with a first side structured to face the socket member, and a second side at the other side of the module body, and wherein the first side is provided with a second opening to the washer space having a size such that the washer may enter the washer space via the second opening.

5. The adapter module according to claim 4, wherein said first side is provided with a predetermined number of through-going holes structured to receive said screws for attachment of said adapter module to said socket member.

6. The adapter module according to claim 4, wherein said second side is provided with a through-going third opening through which opening the washer attachment screw extends, and wherein the third opening has a width in a direction perpendicular to the longitudinal axis of the screw that is larger than the outer diameter of the screw, but smaller than the diameter of the disc-shaped connection washer.

7. The adapter module according to claim 4, wherein the adapter module is provided with a circumferential surface between said first and second sides, and wherein the module has an essentially circular cylindrical shape.

8. A prosthesis arrangement comprising the adapter module according to claim 1, wherein the arrangement comprises an angle adjustment module structured to be attached to said adapter module, and wherein said angle adjustment module is provided with a threaded hole for cooperation with said washer attachment screw.

9. A prosthesis arrangement according to claim 8, wherein said angle adjustment module is provided with adjustment members to adjust the angle of a prosthesis attached to the angle adjustment module in the sagittal plane and in the frontal plane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 shows a schematic illustration of a prior art prosthetic sleeve provided with a socket member having four holes, and a standard pyramidal attachment plate to be mounted at the for the four hole socket member.

[0019] FIG. 2 shows a prior art standard pyramidal attachment plate for the four hole socket member.

[0020] FIG. 3 is a perspective illustration of the adapter module according to one embodiment of the present invention.

[0021] FIG. 4 illustrates the individual components of the adapter module.

[0022] FIG. 5 shows a cross-sectional view of the adapter module.

[0023] FIG. 6 shows an exploded view of the adapter module in combination with an angle adjustment module (tube clamp adaptor).

[0024] FIG. 7 shows a cross-sectional view of the adapter module with the angle adjustment module (with a tube clamp adaptor with angle adjustment).

[0025] FIGS. 8-12 illustrate various examples of prosthetic arrangements according to the present invention.

DETAILED DESCRIPTION

[0026] The adapter module will now be described in detail with references to the appended figures. Throughout the figures the same, or similar, items have the same reference signs. Moreover, the items and the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

[0027] FIG. 1 shows a schematic illustration of a prior art prosthetic sleeve 8 provided with a socket member 6 having four holes 7, and a standard pyramidal attachment plate 9 to be mounted at the four hole socket member 6, and provided with a square stud 11 having the form of a cut four sided pyramid, divergently extending from the base, and four screw holes 13.

[0028] FIG. 2 shows the prior art standard pyramidal attachment plate 9 for the four hole socket member 6.

[0029] An adapter module is provided that is configured to be attached to the fixed socket member of the sleeve by a predetermined number of screws, preferably four screws that securely attach the adapter module to the socket member and thus the amputation stump. The adapter module is thus oriented to facilitate translation into all direction within a plane which is approximately perpendicular to the longitudinal axis of the amputation stump.

[0030] First with references to FIGS. 3-5, the adapter module 2 will be described in detail. The adapter module is configured to be attached, by a predetermined number of screws 4, e.g. four, to a socket member 6 (see FIG. 1) of a prosthetic sleeve 8 (see FIG. 1), into which sleeve 8 an amputation stump of a prosthesis user is to be inserted and attached e.g. mechanically or by under pressure.

[0031] The adapter module 2 comprises a module body 10 provided with a washer space 12 structured to provide room for a disc-shaped connection washer 14. The module body is preferably made from a high-strength and light-weight material. The washer space 12 has an extension to provide for movement of the connection washer 14 within a plane essentially perpendicular to a longitudinal axis A of the prosthetic sleeve 8 prior the connection washer 14 is fixated in a determined position.

[0032] The connection washer 14 is provided with a through-going first opening 16 structured to receive a washer attachment screw 18 such that the screw essentially extends along the longitudinal axis A. Preferably the attachment screw is oriented as illustrated in the figures such that the threaded end is in a direction away from the amputation stump.

[0033] As an alternative, the through-going first opening 16 may be provided with threads. In that case the attachment screw is oppositely directed in comparison to the illustrated embodiments.

[0034] The through-going first opening 16 is preferably positioned off-centered of the washer 14 in order to maximize movement of the washer in all directions within the plane.

[0035] The module body 12 is provided with a first side 20 structured to face the socket member 6, and a second side 22 at the other side of the module body. The first side 20 is provided with a second opening 24 giving access to the washer space 12 and having a size such that the washer 14 may enter the washer space 12 via the second opening 24.

[0036] The first side 20 is provided with a predetermined number of through-going holes 26 structured to receive the screws 4 for attachment of the adapter module 2 to the socket member 6 of the prosthetic sleeve.

[0037] The second side 22 of the module body is provided with a through-going third opening 28 through which opening the washer attachment screw 18 extends. The third opening 28 is essentially circular and has a width in a direction perpendicular to the longitudinal axis of the screw 18 that is larger than the outer diameter of the screw, but smaller than the diameter of the disc-shaped connection washer 14. Thereby the washer may be moved in its plane in order to obtain a position for the attachment screw 18 such that the loads the prosthesis are subjected to may be optimally transferred to the user of the prosthesis.

[0038] The second side 22 is further provided with openings 23 to give access to the screws 4 used to connect the adapter module to the socket member 6.

[0039] The connection washer 14 is preferably provided with indentations 25 shaped to give room for the screws 4, and to enable easy insertion of the washer into to washer space. The adapter module has a circumferential surface 30 between the first and second sides 20, 22, being an outer surface that connects the first and second sides to each other.

[0040] Preferably, the module has an essentially circular cylindrical shape.

[0041] FIG. 3 shows the adapter module according to one embodiment provided with a module body that holds the connection washer in a washer space while still allowing the four attachment screws to connect the adapter module to the socket member. This allows attachment via the attachment screw to attach several other prosthetic components, where one is shown in FIG. 6. As the connection washer is movable within the module body in a plane perpendicular to axis A, the required adjustments are possible to achieve.

[0042] With references to FIGS. 6-12 a prosthesis arrangement according to further embodiments are illustrated. It is in particular referred to FIGS. 6 and 7.

[0043] The prosthesis arrangement comprises the adapter module 2 that has been described above with references to FIGS. 3-5, and an angle adjustment module 32 structured to be attached to the adapter module. The angle adjustment module is provided with a threaded hole 34 for cooperation with the washer attachment screw, by screwing the attachment screw into the hole. In an alternative embodiment, as discussed above, the angle adjustment module is structured to receive the attachment screw head and the screw extends through a non-threaded hole along axis A such that the threaded end of the attachment screw may be attached to the threaded through-going first opening of the connection washer.

[0044] The angle adjustment module is provided with adjustment members 36, e.g. set screws, to adjust the angle of a prosthesis member attached to the angle adjustment module in the sagittal plane and in the frontal plane. Thus, the angle adjustment module provides means for adjusting the angle of the prosthesis in two perpendicular planes. More in detail, when a correct position is set in one plane this position is kept, i.e. does not change, when the correct positon is set in the other plane. Thus, the angle adjustments may be performed independently in the two different planes.

[0045] The locking in a correct position may also be achieved by an outer locking ring (not shown) provided at the angle adjustment module that enables adjustments of angles. Thus, angle adjustments and also rotational and translational positional changes may be performed without having to divide the prosthesis. The locking ring may also provide the adjustment module one further adjustment dimension by including features to adjust the length in the distal direction.

[0046] The angle adjustment module may be provided with a square stud similar to the one illustrated in FIGS. 1 and 2 and having the form of a cut four sided pyramid, divergently extending from the base. Set screws are then applied for cooperation with the sides of the stud structured to adjust the angle between the prosthesis and the longitudinal direction of the stud. See e.g. U.S. Pat. No. 5,888,233 and U.S. Pat. No. 6,398,817.

[0047] The angle adjustment module may also be provided with a sphere arranged at a support plate. The sphere is structured to slide against an internally spherical surface when the angle is adjusted by use of the set screws. The set screws have an angled direction in relation to the support plate. When all set screws are fixated the angle is locked. See e.g. U.S. Pat. No. 5,013,325.

[0048] FIGS. 8-12 shows various examples of angle adjustment modules. In particular, FIGS. 11 and 12 show variations where the prosthesis arrangement is connected to a foot prosthesis.

[0049] The present invention is not limited to the above-described preferred embodiments.

[0050] Various alternatives, modifications and equivalents may be used. Therefore, the above embodiments should not be taken as limiting the scope of the invention, which is defined by the appending claims.