CN110680565B

CN110680565B - Bone filling prosthesis

Info

Publication number: CN110680565B
Application number: CN201911054705.0A
Authority: CN
Inventors: 孟德松
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2025-05-30
Anticipated expiration: 2039-10-31
Also published as: CN110680565A

Abstract

The invention provides a bone filling prosthesis which comprises a main body part, a positioning piece and a connecting piece, wherein the main body part is used for filling bone of a human body, the positioning piece is movably arranged on the main body part and is provided with an initial position and a positioning position, when the positioning piece is in the initial position, at least part of the positioning piece is arranged in the main body part so as to enable the positioning piece to avoid the bone setting, and when the positioning piece is in the positioning position, at least part of the positioning piece protrudes out of the outer surface of the main body part so as to enable the positioning piece to be connected with the bone. By the technical scheme provided by the invention, the technical problem of poor filling stability of the bone filling prosthesis in the prior art can be solved.

Description

Bone filling prosthesis

Technical Field

The invention relates to the technical field of medical treatment, in particular to a bone filling prosthesis.

Background

Currently, bone defects are a problem frequently encountered by orthopedics doctors, and bone defect filling prostheses in the prior art are generally granular, columnar and irregularly shaped, and the bone filling prostheses generally need to have good stability after implantation to achieve a long-term filling effect.

However, the bone filling prosthesis in the prior art generally does not have a structure for connecting with the bone in the human body, thus being unfavorable for fixing the bone filling prosthesis with the bone in the human body and being unfavorable for achieving the effect of long-term filling.

Disclosure of Invention

The invention mainly aims to provide a bone filling prosthesis to solve the technical problem that the filling stability of the bone filling prosthesis in the prior art is poor.

In order to achieve the above object, the present invention provides a bone filling prosthesis comprising a main body for filling bone of a human body, a positioning member movably disposed on the main body, the positioning member having an initial position and a positioning position, at least a portion of the positioning member disposed in the main body when the positioning member is in the initial position so as to avoid the positioning member from being disposed in the bone, and at least a portion of the positioning member protruding from an outer surface of the main body when the positioning member is in the positioning position so as to connect the positioning member with the bone.

Further, a first positioning hole is formed in the main body, at least part of the positioning piece is movably arranged in the first positioning hole, when the positioning piece is in the initial position, the positioning piece is hidden in the first positioning hole, and when the positioning piece is in the positioning position, at least part of the positioning piece extends out of the first positioning hole.

Further, the positioning member is rotatably disposed on the main body portion, so that the positioning member is rotated to an initial position or a positioning position.

The locating piece further comprises a locating part, the locating part is located in the first locating hole when the locating piece is located at the initial position, the locating part protrudes out of the outer surface of the main body part when the locating piece is located at the locating position, and the locating part is of a spike structure used for being pricked into bone.

The bone filling prosthesis further comprises a driving piece, wherein the driving piece is arranged in the second positioning hole, and the driving piece is used for pushing the positioning piece to move from the initial position to the positioning position in the process of entering the second positioning hole.

The positioning piece comprises a connecting part and a protruding part, the connecting part is movably arranged on the main body part, the protruding part is arranged on the connecting part, the protruding part comprises a positioning part and a contact part, the positioning part is connected with the contact part, and the positioning part is pushed to move to a position protruding out of the main body part by the contact of the driving piece and the contact part in the process that the driving piece enters the second positioning hole.

Further, the second positioning hole is an internal threaded hole, and the driving piece is provided with an external threaded section matched with the internal threaded hole, so that the driving piece is matched with the internal threaded hole through threaded connection.

Further, the driving piece is provided with a mounting hole, and the mounting hole is positioned at the end part of the driving piece, so that the operating piece is inserted into the mounting hole to drive the driving piece to move in the internal threaded hole.

Further, the driving member includes a tapered section, and the second positioning hole includes a tapered hole section to be connected by cooperation of the tapered hole section and the tapered section.

Further, the second locating hole includes first hole section and second hole section, and first hole section and second hole section intercommunication set up, and first hole section is first cylinder hole section, and the second hole section is the toper hole section, and the sectional area of first cylinder hole section is greater than the sectional area of toper hole section to form first location step in the junction of first cylinder hole section and toper hole section, in order to carry out the butt location to the driving piece through first location step.

Further, the driving piece comprises a first connecting section and a second connecting section, the first connecting section is connected with the second connecting section, the first connecting section is a first cylindrical section matched with the first hole section, and the second connecting section is a conical section matched with the second hole section.

Further, the driving member comprises a first connecting section and a second connecting section, the first connecting section is connected with the second connecting section, the second connecting section is a conical section matched with the second hole section, the outer wall surface of the first connecting section comprises an arc surface and a plane, the arc surface is connected with the plane, the arc surface is matched with the inner wall surface of the first hole section, and an avoidance section is formed between the plane and the inner wall surface of the first hole section so as to avoid the positioning member through the avoidance section.

Further, the driving piece further comprises a third connecting section, the third connecting section is a second cylindrical section, the third connecting section is located at one end, far away from the second connecting section, of the first connecting section, the diameter of the third connecting section is larger than that of the first connecting section, and a second positioning step is formed at the joint of the third connecting section and the first connecting section, so that the second positioning step is in butt joint with the end part of the main body part.

Further, the driving piece is further provided with a striking hole, so that the positioning piece is installed in the second positioning hole by the striking hole being struck by the operating piece.

Further, the locating pieces are multiple, and the locating pieces are arranged on the main body part at intervals along the ring.

When the main body part is filled into the bone of the human body, the positioning piece moves from the initial position to the positioning position, at least part of the positioning piece protrudes out of the outer surface of the main body part to be arranged, so that the main body part and the bone of the human body are conveniently connected to be combined together stably, and the stability of the bone filling prosthesis implanted into the bone of the human body is improved. Therefore, the technical scheme provided by the invention can solve the technical problem of poor filling stability of the bone filling prosthesis in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic structural view of a bone-filling prosthesis provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates a cross-sectional view of a bone filler prosthesis provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic view showing the structure of a driving member according to a first embodiment of the present invention;

fig. 4 shows a front view of a driving member provided according to a first embodiment of the present invention;

FIG. 5 shows a cross-sectional view of a body portion provided in accordance with a first embodiment of the present invention;

Fig. 6 shows a cross-sectional view of a bone filler prosthesis provided in accordance with a first embodiment of the present invention;

Fig. 7 is a schematic structural view of a driving member according to a second embodiment of the present invention;

fig. 8 shows a front view of a driving member provided according to a second embodiment of the present invention;

Fig. 9 shows a cross-sectional view of a main body portion provided according to a second embodiment of the present invention;

FIG. 10 illustrates a cross-sectional view of a bone filler prosthesis according to an embodiment of the present invention;

fig. 11 is a schematic view showing the structure of a driving member provided according to a third embodiment of the present invention;

FIG. 12 shows a front view of a drive member provided in accordance with a third embodiment of the invention, and

Fig. 13 shows a cross-sectional view of a bone filler prosthesis provided according to a third embodiment of the present invention.

Wherein the above figures include the following reference numerals:

10. The main body part, 11, a first positioning hole, 12, a second positioning hole, 121, a first hole section, 122, a second hole section, 20, a positioning piece, 21, a positioning part, 22, a connecting part, 23, a contact part, 30, a driving piece, 31, a mounting hole, 32, a first connecting section, 33, a second connecting section, 34, a third connecting section and 35, a striking hole.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 and 2, an embodiment of the present invention provides a bone filling prosthesis including a body part 10 and a positioning member 20, the body part 10 being used to fill bone of a human body. The positioning member 20 is movably disposed on the main body 10, and the positioning member 20 has an initial position and a positioning position. When the positioning member 20 is in the initial position, at least a portion of the positioning member 20 is disposed within the body portion 10 such that the positioning member 20 is disposed against bone. When the positioning member 20 is in the positioning position, at least part of the positioning member 20 protrudes from the outer surface of the main body 10, so that the positioning member 20 is connected with bone.

With the bone filling prosthesis provided in this embodiment, the outer surface of the main body 10 is a smooth outer surface, the outer surface of the main body 10 includes a cylindrical surface and an arc end surface, the arc end surface is located at an end of the cylindrical surface, and specifically, the arc end surface may be a spherical surface. With this arrangement, the body portion 10 is facilitated to be brought into the bone of the human body. After the main body 10 is filled into the bone of the human body, the positioning element 20 is moved from the initial position to the positioning position, at this time, at least part of the positioning element 20 protrudes out of the outer surface of the main body 10 to be positioned by the protruding positioning element 20 being pricked into the bone of the human body, so that the main body 10 and the bone of the human body are conveniently connected, so that the main body 10 and the bone of the human body are stably combined together, and the stability of the bone filling prosthesis implanted into the bone of the human body is improved. Therefore, the bone filling prosthesis provided by the invention can solve the technical problem of poor filling stability of the bone filling prosthesis in the prior art.

In the present embodiment, the main body 10 is provided with the first positioning hole 11, and at least part of the positioning member 20 is movably disposed in the first positioning hole 11. When the positioning member 20 is at the initial position, the positioning member 20 is hidden in the first positioning hole 11. When the positioning member 20 is in the positioning position, at least part of the positioning member 20 protrudes from the first positioning hole 11. With such arrangement, in the process of entering the bone of the human body in the main body 10, the positioning member 20 is conveniently located at the initial position to avoid the bone, so that the filling resistance of the main body 10 is reduced, and the filling smoothness of the main body 10 is improved. After the main body 10 is filled into the bone, the positioning member 20 is conveniently moved to the positioning position to position the bone by the protruding positioning member 20, thereby facilitating the improvement of the filling stability.

Specifically, the positioning member 20 in the present embodiment is rotatably provided on the main body portion 10 so that the positioning member 20 is rotated to an initial position or a positioning position. In the present embodiment, the positioning member 20 is rotatably disposed in the first positioning hole 11 so as to smoothly move the positioning member 20 to the initial position or the positioning position, so as to improve the stability of filling. Specifically, the positioning member 20 in this embodiment may be a fixing fin. Specifically, the fixing fin in the present embodiment is rotatable along a rotation shaft, which is fixed to the main body 10 by caulking.

In this embodiment, the positioning member 20 includes a positioning portion 21, and when the positioning member 20 is at the initial position, the positioning portion 21 is located in the first positioning hole 11, so that the positioning portion 21 avoids the bone, so that the main body 10 is smoothly filled into the bone. When the positioning member 20 is at the positioning position, the positioning portion 21 protrudes from the outer surface of the main body 10, so that the positioning portion 21 is inserted into the bone for positioning. Specifically, the positioning portion 21 in this embodiment is a spike structure, and the spike structure is used to penetrate into bone. The spine structure is adopted for positioning, so that the positioning stability can be improved, and the main body part 10 is prevented from moving in bones. Specifically, the spike structure can be a protruding triangular prism structure, or the spike structure is formed by surrounding an arc-shaped surface and a plane, and a spike part is formed at the joint of the arc-shaped surface and the plane so as to facilitate the spike structure to be pricked into bone, thereby facilitating the improvement of the positioning stability.

Specifically, the main body 10 in this embodiment is further provided with a second positioning hole 12, where the second positioning hole 12 extends along the extending direction of the main body 10, and the second positioning hole 12 is disposed in communication with the first positioning hole 11. When the positioning member 20 is in the initial position, at least a portion of the positioning member 20 is positioned within the second positioning hole 12. The bone filler prosthesis further includes a driver 30, the driver 30 being configured to be disposed within the second positioning hole 12 to urge the positioning member 20 from the initial position to the positioning position by the driver 30 during entry of the driver 30 into the second positioning hole 12. With this arrangement, the positioning member 20 can be driven to move easily, so that the positioning member 20 can be moved smoothly from the initial position to the positioning position after the main body 10 is filled into the bone.

In the present embodiment, the positioning member 20 includes a connecting portion 22 and a protruding portion, the connecting portion 22 is movably disposed on the main body portion 10, and the protruding portion is disposed on the connecting portion 22. The protruding portion includes a positioning portion 21 and a contact portion 23, where the positioning portion 21 is connected to the contact portion 23, specifically, the positioning portion 21 is a spike structure. The contact portion 23 is used for contacting with the driving member 30, so that the driving member 30 contacts with the contact portion 23 to push the positioning portion 21 to move to a position protruding from the main body portion 10 during the process of entering the driving member 30 into the second positioning hole 12. With this arrangement, the driving member 30 can be facilitated to push the positioning member 20 from the initial position to the positioning position, so that the positioning portion 21 of the positioning member 20 is inserted into the bone for positioning.

As shown in fig. 3 to 6, in a first embodiment of the present invention, a bone filling prosthesis is provided, wherein the second positioning hole 12 may be an internal threaded hole, and the driving member 30 is provided with an external threaded section adapted to the internal threaded hole, so that the driving member 30 is engaged with the internal threaded hole through a threaded connection. By adopting the arrangement, the connection between the driving piece 30 and the main body part 10 is convenient, the situation that the driving piece 30 is separated from the main body part 10 in the long-term implantation process is avoided, and the filling stability is improved.

In this embodiment, a mounting hole 31 is provided in the driver 30 of the bone filler prosthesis, the mounting hole 31 being located at the end of the driver 30 such that insertion of the operator into the mounting hole 31 moves the driver 30 within the internally threaded bore. Specifically, the mounting hole 31 may be a hexagonal hole, and the end of the operating element is of a hexagonal structure, and the end of the operating element is inserted into the mounting hole 31, and the operating element drives the driving element 30 to be in threaded engagement with the main body 10. Specifically, the operating member may be an internal hexagonal wrench, which cooperates with the hexagonal hole to screw the driving member 30 into the second positioning hole 12, so as to facilitate screwing the positioning member 20, so as to achieve self-fixing.

As shown in fig. 7 to 10, in a second embodiment of the present invention, there is provided a bone filling prosthesis, in which the driving member 30 includes a tapered section, and the second positioning hole 12 includes a tapered hole section to be connected by cooperation of the tapered hole section and the tapered section. By adopting the matching arrangement, the connection stability of the driving piece 30 and the main body part 10 can be improved, the situation that the driving piece 30 is separated from the main body part 10 in the long-term implantation process is avoided, and the filling stability is improved.

In this embodiment, the second positioning hole 12 includes a first hole section 121 and a second hole section 122, the first hole section 121 and the second hole section 122 are disposed in communication, the first hole section 121 is a first cylindrical hole section, the second hole section 122 is a tapered hole section, and the cross-sectional area of the first cylindrical hole section is larger than that of the tapered hole section, so as to form a first positioning step at the junction of the first cylindrical hole section and the tapered hole section, so as to perform abutting positioning on the driving member 30 through the first positioning step. By adopting the arrangement, the positioning stability can be further improved, and the filling stability is further improved.

Correspondingly, the driving member 30 in this embodiment includes a first connecting section 32 and a second connecting section 33, where the first connecting section 32 is connected with the second connecting section 33, the first connecting section 32 is a first cylindrical section adapted to the first hole section 121, and the second connecting section 33 is a conical section adapted to the second hole section 122. By adopting the arrangement, through the matching of the matched driving piece 30 and the second positioning hole 12, on one hand, the driving piece 30 can be convenient to stably drive the positioning piece 20 to move to the positioning position, and on the other hand, the driving piece 30 can be convenient to stably match with the second positioning hole 12, so that the driving piece 30 is prevented from falling off from the second positioning hole 12.

As shown in fig. 11 to 13, a third embodiment of the present invention provides a bone-filling prosthesis, which is different from the second embodiment in that the driving member 30 is structured differently. Specifically, the driving member 30 in this embodiment includes a first connecting section 32 and a second connecting section 33, where the first connecting section 32 and the second connecting section 33 are connected, and the second connecting section 33 is a tapered section adapted to the second hole section 122. The outer wall surface of the first connecting section 32 comprises an arc surface and a plane, the arc surface is connected with the plane, the arc surface is matched with the inner wall surface of the first hole section 121, and an avoidance interval is formed between the plane and the inner wall surface of the first hole section 121 so as to avoid the positioning piece 20 through the avoidance interval. In this embodiment, the number of the positioning members 20 is plural, so that in the process that the driving member 30 enters the second positioning hole 12, part of the positioning members 20 can be selectively moved from the initial position to the positioning position through avoiding in the avoiding interval, so that the corresponding positioning members 20 can be selected for positioning according to the actual situation, and the operation is convenient. Specifically, a plane may be milled on the cylindrical section, thereby forming the avoidance interval. With such an arrangement, it is convenient to selectively unscrew part of the fixing fins (here, the fixing fins are the positioning members 20) according to clinical needs, so as to achieve self-fixing.

In the second embodiment and the third embodiment, the driving member 30 further includes a third connecting section 34, the third connecting section 34 is a second cylindrical section, the third connecting section 34 is located at an end of the first connecting section 32 away from the second connecting section 33, and the diameter of the third connecting section 34 is larger than that of the first connecting section 32, so that a second positioning step is formed at a connection position between the third connecting section 34 and the first connecting section 32, so that the second positioning step is in abutting positioning with an end portion of the main body 10. With such an arrangement, the driving member 30 is easily positioned on the main body portion 10, and the positioning stability is further improved.

In order to facilitate filling of the driving member 30 of the second and third embodiments into the second positioning hole 12, a striking hole 35 is further provided on the driving member 30 so that the positioning member 20 is installed in the second positioning hole 12 by the operation member striking the striking hole 35. Specifically, the striking hole 35 is located at an end of the driving member 30, and the striking hole 35 may be a cylindrical hole. The operation member may be a beater, and the beating hole 35 is beaten by a proper beater, so that the taper fit is achieved, and the self-fixing is facilitated.

Specifically, the positioning members 20 in the first, second and third embodiments may be plural, and the plural positioning members 20 are disposed on the main body portion 10 at annular intervals. Specifically, in this embodiment, a plurality of sets of positioning members 20 are included, the plurality of sets of positioning members 20 are disposed on the main body 10 at intervals along the ring shape, each set of positioning members 20 includes a plurality of positioning members 20, and the plurality of positioning members 20 are disposed at intervals along the extending direction of the main body 10. With such arrangement, the bone can be conveniently inserted into the bone through the plurality of positioning members 20 for positioning, thereby facilitating better improvement of positioning stability and further improving filling stability.

Specifically, in the first, second and third embodiments, the main body 10 is provided with a plurality of through holes, and the plurality of through holes may be disposed in communication with the second positioning hole 12, so that bone fragments may enter the plurality of through holes during the process of entering the bone from the main body 10. Therefore, bone fragments can conveniently grow into the through holes by entering the bone fragments into the through holes, so that the bone filling prosthesis can conveniently grow into the bone fragments, and the filling stability can be improved.

From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects that the self-fixing bone filling prosthesis provided by the present invention is of a modular design, and facilitates connection of the driving member and the main body portion by means of a threaded structure or a taper connection, etc., and in clinical use, a physician can selectively unscrew part or all of the positioning members according to the bone condition of a patient, so as to facilitate fixation.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bone-filling prosthesis, comprising:

A main body part (10), wherein the main body part (10) is used for filling human bones;

The positioning piece (20) is movably arranged on the main body part (10), the positioning piece (20) is provided with an initial position and a positioning position, when the positioning piece (20) is positioned at the initial position, at least part of the positioning piece (20) is arranged in the main body part (10) so as to enable the positioning piece (20) to avoid the bone setting, and when the positioning piece (20) is positioned at the positioning position, at least part of the positioning piece (20) protrudes out of the outer surface of the main body part (10) to enable the positioning piece (20) to be connected with the bone;

The main body part (10) is provided with a second positioning hole (12), and the main body part (10) is provided with a plurality of through holes which are communicated with the second positioning hole (12) so that bone fragments enter the through holes in the process of entering the bone of the main body part (10);

The positioning piece (20) is rotatably arranged on the main body part (10) so as to enable the positioning piece (20) to rotate to the initial position or the positioning position;

The main body part (10) is provided with a first positioning hole (11), and at least part of the positioning piece (20) is movably arranged in the first positioning hole (11), when the positioning piece (20) is positioned at the initial position, the positioning piece (20) is hidden in the first positioning hole (11), and when the positioning piece (20) is positioned at the positioning position, at least part of the positioning piece (20) extends out of the first positioning hole (11);

The second positioning hole (12) extends along the extending direction of the main body part (10), the second positioning hole (12) is communicated with the first positioning hole (11), when the positioning piece (20) is at the initial position, at least part of the positioning piece (20) is positioned in the second positioning hole (12), and the bone filling prosthesis further comprises:

The driving piece (30) is used for being arranged in the second positioning hole (12) so as to push the positioning piece (20) to move from the initial position to the positioning position through the driving piece (30) in the process that the driving piece (30) enters the second positioning hole (12).

2. The bone filling prosthesis according to claim 1, wherein the positioning member (20) comprises a positioning portion (21), the positioning portion (21) being located in the first positioning hole (11) when the positioning member (20) is in the initial position, the positioning portion (21) being provided protruding from an outer surface of the main body portion (10) when the positioning member (20) is in the positioning position, the positioning portion (21) being of a spike structure for penetrating into the bone.

3. The bone filling prosthesis according to claim 1, wherein the positioning member (20) comprises a connecting portion (22) and a protruding portion, the connecting portion (22) being movably arranged on the main body portion (10), the protruding portion being arranged on the connecting portion (22), the protruding portion comprising a positioning portion (21) and a contact portion (23), the positioning portion (21) and the contact portion (23) being connected to each other so as to push the positioning portion (21) to a position protruding from the main body portion (10) by the driving member (30) coming into contact with the contact portion (23) during the driving member (30) entering the second positioning hole (12).

4. Bone filler prosthesis according to claim 1, characterized in that the second positioning hole (12) is an internally threaded hole, and the driver (30) is provided with an externally threaded section adapted to the internally threaded hole, so that the driver (30) cooperates with the internally threaded hole by means of a threaded connection.

5. The bone filling prosthesis according to claim 4, wherein the driving member (30) is provided with a mounting hole (31), and the mounting hole (31) is located at an end of the driving member (30) so that the driving member (30) is driven to move in the internally threaded hole after the operating member is inserted into the mounting hole (31).

6. The bone filling prosthesis according to claim 1, wherein the driver (30) comprises a tapered section and the second positioning hole (12) comprises a tapered hole section for connection by mating of the tapered hole section and the tapered section.

7. The bone filling prosthesis according to claim 1, wherein the second positioning hole (12) comprises a first hole section (121) and a second hole section (122), the first hole section (121) and the second hole section (122) being arranged in communication, the first hole section (121) being a first cylindrical hole section, the second hole section (122) being a conical hole section, the cross-sectional area of the first cylindrical hole section being larger than the cross-sectional area of the conical hole section to form a first positioning step at the junction of the first cylindrical hole section and the conical hole section for abutment positioning of the driver (30) by the first positioning step.

8. The bone filling prosthesis according to claim 7, wherein the driver (30) comprises a first connection section (32) and a second connection section (33), the first connection section (32) being arranged in connection with the second connection section (33), the first connection section (32) being a first cylindrical section adapted to the first bore section (121), the second connection section (33) being a conical section adapted to the second bore section (122).

9. The bone filling prosthesis according to claim 8, wherein the driving member (30) comprises a first connecting section (32) and a second connecting section (33), the first connecting section (32) and the second connecting section (33) are connected, the second connecting section (33) is a conical section matched with the second hole section (122), the outer wall surface of the first connecting section (32) comprises an arc surface and a plane, the arc surface is connected with the plane, the arc surface is matched with the inner wall surface of the first hole section (121), and an avoidance section is formed between the plane and the inner wall surface of the first hole section (121) so as to avoid the positioning member (20) through the avoidance section.

10. The bone filling prosthesis according to claim 8 or 9, wherein the driver (30) further comprises a third connecting section (34), the third connecting section (34) being a second cylindrical section, the third connecting section (34) being located at an end of the first connecting section (32) remote from the second connecting section (33), the third connecting section (34) having a larger diameter than the first connecting section (32) to form a second positioning step at the junction of the third connecting section (34) and the first connecting section (32) to enable the second positioning step to be positioned in abutment with the end of the body portion (10).

11. The bone filling prosthesis according to claim 6, wherein the driving member (30) is further provided with a striking hole (35) so that the positioning member (20) is mounted in the second positioning hole (12) by the operating member striking the striking hole (35).

12. Bone filler prosthesis according to claim 1, characterized in that the number of positioning elements (20) is a plurality, the plurality of positioning elements (20) being arranged on the body part (10) at annular intervals.