CN113101016B

CN113101016B - Prosthesis connecting element and prosthesis assembly

Info

Publication number: CN113101016B
Application number: CN202110524627.7A
Authority: CN
Inventors: 李新宇
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2022-08-16
Anticipated expiration: 2041-05-13
Also published as: CN113101016A

Abstract

The invention provides a prosthesis connecting element and a prosthesis assembly, wherein the prosthesis connecting element comprises: the telescopic rod comprises a first rod body and a second rod body which can move relatively; the transmission structure is arranged in the telescopic rod, the transmission structure rotates to drive the second rod body to move relative to the first rod body, a through hole opposite to the transmission structure is formed in the telescopic rod, and an external tool can drive the transmission structure to rotate through the through hole; and the magnetic driving structure can drive the transmission structure to rotate under the action of an external magnetic field. By applying the technical scheme of the invention, the problems of poor implantation effect and poor universality of the prosthesis in the prior art can be effectively solved.

Description

Prosthesis connecting element and prosthesis assembly

Technical Field

The invention relates to the field of medical prostheses, in particular to a prosthesis connecting piece and a prosthesis assembly.

Background

The human skeleton is the main bearing structure of the human body and is very important for the human body. The defect or damage of part of the skeleton can cause serious influence on the normal life of people. At present, the defect or damage of the bone, especially in the long bone part of the limbs, is mainly implemented by adopting the mode of implanting a prosthesis with a fixing structure to supplement the defect section or fix the damaged area. This fixation concept provides stable fixation and support, but does not allow for individualized adjustment of the damaged area. Thereby causing a situation where the bone healing result is unstable. To improve this situation, it is necessary to adjust the mechanical environment inside the bone to stress conditions that approximate or facilitate bone growth or healing.

With the advancement of the medical and manufacturing levels, physicians may apply different fixation methods to the damaged bone tissue depending on the condition of the patient. But often means that more prosthetic models of surgical instruments are required. The prosthesis alone does not address the need for wide adjustment. There is a need for a prosthesis having a range of adjustability while having structural changes that allow for the adjustment of compression or decompression of the bone healing area at any time.

Disclosure of Invention

The invention mainly aims to provide a prosthesis connecting element and a prosthesis component, which are used for solving the problems of poor implantation effect and universality of the prosthesis in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a prosthesis attachment element comprising: the telescopic rod comprises a first rod body and a second rod body which can move relatively; the transmission structure is arranged in the telescopic rod, the transmission structure rotates to drive the second rod body to move relative to the first rod body, a through hole opposite to the transmission structure is formed in the telescopic rod, and an external tool can drive the transmission structure to rotate through the through hole; and the magnetic driving structure can drive the transmission structure to rotate under the action of an external magnetic field.

Further, the second body of rod nests in first body of rod, and transmission structure includes the screw rod, and the second body of rod has the hole, and the hole of the second body of rod includes the screw hole section, and the screw thread on the screw rod and the screw thread on the screw hole section are self-locking thread.

Further, the transmission structure still includes the gear box that sets up in first rod, and the gear box includes the gear box body and by input shaft and the output shaft that the gear box body was worn out, output shaft and screw rod drive connection.

Further, the magnetic driving structure is a permanent magnet sleeved on the input shaft of the gearbox.

Further, the through hole is opposed to the input shaft of the gear case.

Further, a bearing is arranged between the driving end of the screw rod and the inner hole of the first rod body.

Furthermore, the second rod body is nested in the first rod body, and a flexible elastic sheet is arranged between the hole wall of the inner hole of the first rod body and the side wall of the second rod body so as to enable the first rod body and the second rod body to be coaxial.

Further, the second body of rod nests in the first body of rod, is provided with spacing arch on the pore wall of the hole of the first body of rod and one of the lateral wall of the second body of rod, is provided with the spacing groove that extends along the axis direction of telescopic link on the pore wall of the hole of the first body of rod and another in the lateral wall of the second body of rod, spacing arch and spacing cooperation of spacing groove.

Further, the prosthetic connector further comprises: and the two connectors are respectively positioned at two ends of the telescopic rod and respectively arranged at the end part of the first rod body and the end part of the second rod body, and a connecting groove connected with the prosthesis is arranged on the end surface of the connector.

Further, the through hole extends to the groove bottom of the connecting groove.

According to another aspect of the present invention there is provided a prosthesis assembly comprising: a first prosthesis; a second prosthesis; the prosthesis connecting piece is the prosthesis connecting piece, the first prosthesis is connected with the first rod body of the telescopic rod of the prosthesis connecting piece, and the second prosthesis is connected with the second rod body of the telescopic rod of the prosthesis connecting piece.

By applying the technical scheme of the invention, axial displacement in two directions of stretching and compressing can be provided, so that an axial stress condition suitable for a bone defect area of a patient is generated according to clinical requirements, on one hand, the mechanical environment of damaged bone tissues is improved, and normal growth and healing of bones in the area are promoted; on the other hand, the universality can be improved, prostheses of various models do not need to be arranged, and the production cost is reduced. In addition, by applying the technical scheme of the embodiment, the transmission structure can be adjusted in length in two forms of an external electromagnetic field and a mechanical wrench (external tool), and the adjustment of the structure length under the condition of minimal invasion or even non-invasive can be realized. In addition, under the condition that the magnetic driving structure fails, the length can be adjusted in a mechanical mode, and the working reliability of the prosthesis connecting element can be improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a perspective view of an embodiment of a prosthetic connector according to the present invention;

FIG. 2 shows an enlarged schematic view of the prosthetic connector of FIG. 1 at A; and

figure 3 shows a schematic longitudinal cross-sectional view of the prosthetic connector of figure 1.

Wherein the figures include the following reference numerals:

10. a telescopic rod; 11. a first rod body; 111. a through hole; 112. a limiting bulge; 12. a second rod body; 121. a threaded bore section; 122. a limiting groove; 20. a transmission structure; 21. a screw; 22. a gear case; 221. a gear box body; 222. an input shaft; 223. an output shaft; 30. a magnetic drive structure; 40. a bearing; 50. a flexible spring sheet; 60. a connector; 61. and connecting the grooves.

Detailed Description

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

As shown in fig. 1 and 3, the prosthesis attachment element of the present embodiment includes: a telescopic rod 10, a transmission structure 20 and a magnetic driving structure 30. The telescopic rod 10 includes a first rod 11 and a second rod 12 capable of moving relatively. The transmission structure 20 is disposed in the telescopic rod 10, the transmission structure 20 rotates to drive the second rod 12 to move relative to the first rod 11, a through hole 111 opposite to the transmission structure 20 is disposed on the telescopic rod 10, and an external tool can drive the transmission structure 20 to rotate through the through hole 111. The magnetic driving structure 30 can drive the transmission structure 20 to rotate under the action of the external magnetic field.

By applying the technical scheme of the embodiment, axial displacement in two directions of stretching and compressing can be provided, so that an axial stress condition suitable for a bone defect area of a patient is generated according to clinical requirements, on one hand, the mechanical environment of damaged bone tissues is improved, and normal growth and healing of bones in the area are promoted; on the other hand, the universality can be improved, prostheses of various models do not need to be arranged, and the production cost is reduced. In addition, by applying the technical solution of this embodiment, the transmission structure 20 can adjust the length through two forms of an external electromagnetic field and a mechanical wrench (external tool), and the adjustment of the structure length under the minimally invasive or even non-invasive condition can be realized. In addition, in case of failure of the magnetic drive structure 30, the length adjustment can be made mechanically, which can improve the reliability of the operation of the prosthetic connector.

As shown in fig. 3, in the present embodiment, the second rod 12 is nested in the first rod 11, the transmission structure 20 includes a screw 21, the second rod 12 has an inner hole, the inner hole of the second rod 12 includes a threaded hole section 121, and the threads on the screw 21 and the threads on the threaded hole section 121 are self-locking threads. On one hand, the structure enables the second rod body 12 to be easily driven to move by applying a small torque, and the purpose of retracting or contracting movement is achieved. On the other hand, under the condition of no torque force driving, even under the external load working condition that the telescopic rod 10 is stretched or compressed, due to the self-locking thread design between the screw rod 21 and the second rod body 12, the axial force cannot reversely drive the structure to generate dead axle rotation, so that the self-locking function of the structure under the static state is realized, and the structure has high stability. In addition, the above structure also makes the axial displacement amount control of the second rod body 12 accurate, thereby further improving the healing effect.

As shown in fig. 3, in the present embodiment, the transmission structure 20 further includes a gear box 22 disposed in the first rod 11, the gear box 22 includes a gear box body 221, and an input shaft 222 and an output shaft 223 extending from the gear box body 221, and the output shaft 223 is drivingly connected to the screw 21. Specifically, the torque input method includes the following two methods: (1) the magnetic driving structure 30 is driven by an external electromagnetic field, so that the magnetic driving structure 30 rotates at a constant speed to drive the input shaft 222 to rotate, and the torque is transmitted into the gear box body 221; (2) the torque is transferred into the gearbox body 221 using a mechanical wrench to directly drive the input shaft 222 in rotation through the through-hole 111. The torque is gradually increased while the reduction ratio of the gear box 22 is gradually decreased, and then the load with low rotation speed and high torque is transmitted through the output shaft 223. Therefore, the structure can realize that the second rod body 12 is controlled to move by smaller torque no matter the artificial connection piece is driven by electromagnetism or manually, so that the artificial connection piece is easier to adjust in the body of a patient, and the requirement on an external magnetic field is reduced.

Preferably, in the present embodiment, the transmission structure 20 can change the transmission ratio according to actual needs. Thus achieving a gear ratio of 500:1 to 10000: 1. After the gear structures with different transmission ratios are applied to the whole structure, the whole diameter size can be between 12mm and 35mm, and the gear structure can be applied to various human skeleton parts.

As shown in fig. 3, in the present embodiment, the magnetic driving structure 30 is a permanent magnet sleeved on the input shaft 222 of the gear box 22. The structure is simple, the assembly is convenient, and the cost is low.

As shown in fig. 3, in the present embodiment, the through hole 111 is opposed to the input shaft 222 of the gear case 22. The structure is convenient for a doctor to manually adjust the length of the prosthesis connecting element according to actual conditions.

As shown in fig. 3, in the present embodiment, a bearing 40 is disposed between the driving end of the screw 21 and the inner hole of the first rod 11. The above structure ensures the smoothness when the screw 21 rotates. Preferably, in the present embodiment, the bearing 40 is a sealed bearing.

As shown in fig. 3, in the present embodiment, the second rod 12 is nested in the first rod 11, and a flexible elastic sheet 50 is disposed between a hole wall of an inner hole of the first rod 11 and a side wall of the second rod 12. The above structure can play a role in stabilizing the second rod body 12, so that the first rod body 11 and the second rod body 12 are coaxial, and the second rod body 12 is prevented from swinging when moving. It should be noted that, in the present embodiment, the flexible resilient sheet 50 is annular, an inner ring of the flexible resilient sheet 50 abuts against the second rod 12, and the flexible resilient sheet 50 abuts against a hole wall of the inner hole of the first rod 11.

As shown in fig. 1 to 3, in the present embodiment, the second rod 12 is nested in the first rod 11, one of the hole wall of the inner hole of the first rod 11 and the side wall of the second rod 12 is provided with a limiting protrusion 112, the other of the hole wall of the inner hole of the first rod 11 and the side wall of the second rod 12 is provided with a limiting groove 122 extending along the axial direction of the telescopic rod 10, and the limiting protrusion 112 is in limiting fit with the limiting groove 122. The above structure enables the second rod 12 to move directionally along the axial direction of the telescopic rod 10 when moving, and thus, the guiding function is achieved. Preferably, in this embodiment, the flexible resilient piece 50 is located at the end of the limiting groove 122 (near the end of the second rod 12 extending out of the first rod 11). The above structure can further improve the stability of the second rod 12 when moving.

As shown in fig. 1 and 3, in the present embodiment, the prosthesis attachment element further includes: two connectors 60, two connectors 60 are located at two ends of the telescopic rod 10 respectively, and are disposed on the end of the first rod 11 and the end of the second rod 12 respectively, and a connecting groove 61 connected with the prosthesis is disposed on the end surface of the connector 60. The prosthesis connecting piece can be connected with joint prostheses (such as femoral condyles, femoral stems, elbow joint prostheses, wrist joint prostheses, ankle joint prostheses and the like) of any long bone region rapidly and stably through the connector 60, so that the assembly efficiency is improved on one hand, and the universality of the prosthesis connecting piece is improved on the other hand.

As shown in fig. 3, in the present embodiment, the through hole 111 extends to the groove bottom of the connection groove 61. The structure enables the through hole 111 and the connecting groove 61 not to be arranged side by side, so that the diameter of the first rod body 11 is effectively reduced, the miniaturization design of the prosthesis connecting piece is realized, and the prosthesis connecting piece can be applied to various human skeleton parts.

The present application also provides a prosthesis assembly (not shown in the figures), embodiments of the prosthesis assembly according to the present application comprising: the prosthesis connecting piece is the prosthesis connecting piece, the first prosthesis is connected with the first rod body 11 of the telescopic rod 10 of the prosthesis connecting piece, and the second prosthesis is connected with the second rod body 12 of the telescopic rod 10 of the prosthesis connecting piece. The prosthesis coupling described above also has the advantages described above, since it has the advantage of enabling adjustment of the structural length in a minimally invasive or even non-invasive manner.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the present invention can apply a certain torque on the input shaft 222 of the gear box 22 by the action of an external electromagnetic field or the torque of a mechanical wrench, so as to drive the second rod 12 to extend or retract along a specified direction, thereby realizing the length change of the whole structure. The product of the invention can be widely used in a plurality of orthopedic fields such as orthopedic extension fixation, wound reinforcement and promotion of bone healing, orthopedic spinal correction and the like.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A prosthetic connector, comprising:

the telescopic rod (10) comprises a first rod body (11) and a second rod body (12) which can move relatively;

the transmission structure (20) is arranged in the telescopic rod (10), the transmission structure (20) drives the second rod body (12) to move relative to the first rod body (11) in a rotating mode, a through hole (111) opposite to the transmission structure (20) is formed in the telescopic rod (10), and an external tool can drive the transmission structure (20) to rotate through the through hole (111);

the magnetic driving structure (30) can drive the transmission structure (20) to rotate under the action of an external magnetic field;

the second rod body (12) is nested in the first rod body (11), the transmission structure (20) comprises a screw rod (21), the second rod body (12) is provided with an inner hole, the inner hole of the second rod body (12) comprises a threaded hole section (121), and threads on the screw rod (21) and threads on the threaded hole section (121) are self-locking threads;

the transmission structure (20) further comprises a gear box (22) arranged in the first rod body (11), the gear box (22) comprises a gear box body (221), an input shaft (222) and an output shaft (223) which penetrate through the gear box body (221), and the output shaft (223) is in driving connection with the screw rod (21);

the through hole (111) is opposed to an input shaft (222) of the gear case (22).

2. The prosthetic connection according to claim 1, wherein the magnetic drive structure (30) is a permanent magnet mounted on the input shaft (222) of the gearbox (22).

3. A prosthesis coupling according to claim 1, characterized in that a bearing (40) is arranged between the driving end of said screw (21) and the inner bore of said first stem (11).

4. A prosthesis coupling according to claim 1, wherein said second stem (12) is nested within said first stem (11), and wherein a flexible resilient tab (50) is provided between the wall of the bore of said first stem (11) and the side wall of said second stem (12) to make said first stem (11) and said second stem (12) coaxial.

5. The prosthesis coupling member according to claim 1, wherein the second rod (12) is nested in the first rod (11), one of the hole wall of the inner hole of the first rod (11) and the side wall of the second rod (12) is provided with a limiting protrusion (112), the other of the hole wall of the inner hole of the first rod (11) and the side wall of the second rod (12) is provided with a limiting groove (122) extending along the axial direction of the telescopic rod (10), and the limiting protrusion (112) is in limiting fit with the limiting groove (122).

6. The prosthetic connector of claim 1 further comprising:

two connectors (60), two connectors (60) are located respectively the both ends of telescopic link (10) to set up respectively in the tip of the first body of rod (11) and on the tip of the second body of rod (12), be provided with spread groove (61) of being connected with the false body on the terminal surface of connector (60).

7. A prosthetic connection according to claim 6, characterized in that the through hole (111) extends to the groove bottom of the connection groove (61).

8. A prosthesis assembly, comprising:

a first prosthesis;

a second prosthesis;

prosthesis attachment, characterized in that it is a prosthesis attachment according to any one of claims 1 to 7, the first prosthesis being connected to the first shaft (11) of the telescopic rod (10) of the prosthesis attachment and the second prosthesis being connected to the second shaft (12) of the telescopic rod (10) of the prosthesis attachment.