Percutaneous osseointegration artificial limb

Abstract

The utility model discloses a percutaneous osseointegration artificial limb which comprises a medullary cavity internal implant, an artificial limb body, a cortical lateral implant and a connector, and the cortical lateral implant is arranged outside a base table of the medullary cavity internal implant in a surrounding mode. The connector is located between the abutment and the outer cortex implant, the connector is in internal thread connection with the abutment, and the connector is in external thread connection with the outer cortex implant; and the artificial limb is mounted at the bottom of the connector. According to the outer cortical implant, the density of tail-end cortical bones can be increased, the fracture risk of thighbone tail-end bones is reduced, and meanwhile bacterial colonization is avoided; and the stress concentration of the implant in the medullary cavity is dispersed, so that the fracture risk of the implant in the medullary cavity is avoided, bone regeneration inside the medullary cavity and outside the cortex can be induced at the same time, the bone strength is increased, and osseointegration is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of prostheses, and more specifically to a percutaneous osseointegrated prosthesis. Background Art

[0002] A percutaneous osseointegrated prosthesis is a prosthesis that is directly connected to the bone through surgery. It usually includes an intramedullary implant, an external prosthesis, and connecting parts between the two. The bone-implant contact is the inner surface of the cortical bone, which greatly improves the overall quality of life of amputees.

[0003] However, on the one hand, when a screw-type or press-fit implant is inserted into the femoral medullary cavity, the bone cortex around the end of the implant will lack sufficient stress stimulation when the implant performs its load-bearing function, resulting in bone absorption (osteolysis) around the bone-implant-skin interface, i.e., a stress shielding effect. Resident bacteria from the skin opening may penetrate the osteolytic bone and cause implant loosening and osteomyelitis. On the other hand, the connecting parts between the intramedullary implant and the external prosthesis are prone to breakage due to excessive stress.

[0004] Therefore, providing a stable percutaneous osseointegrated prosthesis is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the utility model provides a percutaneous osseointegration prosthesis to increase bone strength and promote osseointegration.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A percutaneous bone integration prosthesis comprises an intramedullary implant and a prosthesis, and also comprises an extracortical implant and a connector. The extracortical implant is arranged outside the base of the intramedullary implant; the connector is located between the base and the extracortical implant, and the connector is connected to the base with an internal thread, and the connector is connected to the extracortical implant with an external thread; the prosthesis is installed at the bottom of the connector.

[0008] By adopting the above scheme, the beneficial effects of the utility model are:

[0009] The extracortical implant can increase the density of the distal cortical bone, reduce the risk of fracture of the distal femoral bone, and avoid bacterial colonization; and the stress concentration of the implant inside the medullary cavity is dispersed to avoid the risk of fracture of the implant inside the medullary cavity. It can also induce bone regeneration inside the medullary cavity and outside the cortex, increase bone strength, and promote bone integration.

[0010] Furthermore, the bottom end surface of the cortical outer implant is flush with the bottom end surface of the base.

[0011] Furthermore, the bottom end surface of the cortical outer implant and the bottom end surface of the abutment both extend 1-2 cm beyond the end of the bone.

[0012] Furthermore, it also includes two fastening screws, which are horizontally and symmetrically installed on both sides of the cortical outer implant near the top.

[0013] It can be seen that the utility model provides a percutaneous osseointegrated prosthesis. Compared with the prior art, the utility model:

[0014] Changing the bone-implant contact from the inner surface of the cortical bone to the inner and outer surfaces of the cortical bone can induce regeneration of the cortical part of the femoral stump, increase cortical bone density, and avoid the risk of fracture or the risk of bacteria invading the body along the fracture site. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 The accompanying drawing is a cross-sectional view of a percutaneous osseointegrated prosthesis provided by the utility model;

[0017] Figure 2 The attached picture is Figure 1 A schematic diagram of the enlarged structure of part A;

[0018] Figure 3 The attached drawing is an exploded view of a percutaneous osseointegration prosthesis provided by the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1-3As shown, the utility model embodiment discloses a percutaneous bone integration prosthesis, including an implant 1 inside the medullary cavity, a prosthesis 2, an implant 3 outside the cortex, and a connector 4. The implant 3 outside the cortex is arranged outside the base 11 of the implant 1 inside the medullary cavity; the connector 4 is located between the base 11 and the implant 3 outside the cortex, and the connector 4 is connected to the internal thread of the base 11, and the central internal internal thread of the connector 4 is connected to the external thread of the base 11, and the connector 4 is connected to the external thread of the implant 3 outside the cortex, that is, the external external thread of the connector 4 is connected to the internal thread of the implant 3 outside the cortex; the prosthesis 2 is installed at the bottom of the connector 4. In this embodiment, the implant 1 inside the medullary cavity, the implant 3 outside the cortex, and the connector 4 are all made of titanium alloy. The implant 3 outside the cortex of the utility model can increase the bone density of the terminal cortex, reduce the risk of fracture of the femoral terminal bone, and avoid bacterial colonization; and the stress concentration of the implant 1 inside the medullary cavity is dispersed, avoiding the risk of fracture of the implant 1 inside the medullary cavity, and can simultaneously induce bone regeneration inside the medullary cavity and outside the cortex, increase bone strength, and promote bone integration.

[0021] Specifically, the bottom end surface of the cortical outer implant 3 is flush with the bottom end surface of the base 11 .

[0022] Specifically, the bottom end surface of the cortical outer implant 3 and the bottom end surface of the abutment 11 both extend 1-2 cm beyond the end of the bone.

[0023] In order to further optimize the technical solution of the utility model, two fastening screws 5 are also included. The two fastening screws 5 are horizontally and symmetrically installed on both sides of the cortical outer implant 3 near the top to increase stability.

[0024] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0025] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A percutaneous osteointegrated prosthesis, comprising an intramedullary implant and a prosthesis, characterized in that: It also includes an extracortical implant and a connector, wherein the extracortical implant is arranged outside the base of the implant inside the medullary cavity; the connector is located between the base and the extracortical implant, and the connector is connected to the internal thread of the base, and the connector is connected to the external thread of the extracortical implant; the prosthesis is installed at the bottom of the connector.

2. A percutaneous osseointegrated prosthesis according to claim 1, characterized in that: The bottom end surface of the cortical outer implant is flush with the bottom end surface of the base.

3. A percutaneous osseointegrated prosthesis according to claim 2, characterized in that: The cortical outer implant bottom end surface and the abutment bottom end surface both extend 1-2 cm beyond the bone end.

4. A percutaneous osseointegrated prosthesis according to any one of claims 1 to 3, characterized in that: It also includes two fastening screws, which are horizontally and symmetrically installed on both sides of the cortical outer implant near the top.

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