CN214181272U

CN214181272U - Tumor type knee joint prosthesis containing CFR-PEEK material

Info

Publication number: CN214181272U
Application number: CN202022580934.0U
Authority: CN
Inventors: 郭卫; 郭煜
Original assignee: Peking University Peoples Hospital
Current assignee: Peking University; Peking University Peoples Hospital
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-09-14
Anticipated expiration: 2030-11-10

Abstract

The utility model discloses a contain tumour type knee joint prosthesis of CFR-PEEK material, its characterized in that: comprises a femur component and a tibia component; wherein the femoral component comprises a femoral distal prosthesis made from a CFR-PEEK material; the tibia assembly comprises a tibia platform prosthesis and a gasket, the tibia platform prosthesis is connected with a femur far-end prosthesis, the gasket is arranged at the near end of the tibia platform prosthesis and used for bearing the femur far-end prosthesis, the tibia platform prosthesis is made of CoCrMo alloy materials, and the gasket is made of PE materials; the utility model discloses a tumour type knee joint prosthesis has mechanical properties good, characteristics such as matter is light, light transmissivity are good, overcomes current tumour type knee joint prosthesis's defect.

Description

Tumor type knee joint prosthesis containing CFR-PEEK material

Technical Field

The utility model relates to a tumor type knee joint prosthesis containing CFR-PEEK (carbon fiber reinforced polyether ether ketone) material, belonging to the field of medical appliance.

Background

The distal femur and the proximal tibia are the sites where malignant bone tumors develop well. At present, the method for treating malignant bone tumor at the part mainly comprises the steps of cutting bones according to surgical boundaries (generally 3cm of tumor boundaries), completely taking down the tumor, and then reconstructing the tumor by using a tumor type artificial knee joint prosthesis.

Currently, commercially available tumor-type joint materials are mainly composed of cobalt-chromium-molybdenum (CoCrMo) alloys and Polyethylene (PE). The two materials have excellent wear resistance and mechanical strength, and can ensure that a patient can obtain immediate joint stabilization after being implanted. However, as endoprostheses for use in the bone oncology sector, they have some disadvantages, firstly, the CoCrMo alloy has an excessively high density (8.9 g/cm)³) The prepared prosthesis has overlarge weight, can accelerate the load of peripheral bone, and can possibly cause fracture and abrasion; secondly, metal particles generated in the abrasion process of the CoCrMo alloy can cause inflammatory reaction of surrounding tissues; in addition, as the metal material, CoCrMo alloy, like medical titanium alloy (Ti6Al4V), scatters when radiation is irradiated on its surface, generating metal artifacts which affect the doctor's observation when CT or MR examination is performed, affect the radiation dose estimation when tumor radiotherapy is performed, and damage the surrounding normal tissues by scattered radiation. Therefore, a novel tumor-type knee joint prosthesis which has the advantages of the existing tumor-type knee joint prosthesis and has light transmittance is urgently needed to be developed.

Disclosure of Invention

In order to solve the problems, the utility model discloses in being applied to tumour type knee joint prosthesis with CFR-PEEK material, provide a quality light, light transmissivity and mechanical properties good and nontoxic tumour type knee joint prosthesis who contains CFR-PEEK material.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a tumor type knee joint prosthesis containing CFR-PEEK material comprises a femur component and a tibia component;

wherein the femoral component comprises a femoral distal prosthesis made from a CFR-PEEK material; the tibia assembly comprises a tibia platform prosthesis and a liner, the tibia platform prosthesis is connected with a femur far-end prosthesis, the liner is arranged at the near end of the tibia platform prosthesis and used for bearing the femur far-end prosthesis, the tibia platform prosthesis is made of a CoCrMo alloy material, and the liner is made of a PE material.

In some embodiments, the distal femoral prosthesis comprises a prosthesis body and two protective shells covering two sides of the prosthesis body, the prosthesis body is connected with the tibial plateau prosthesis, the two protective shells correspond to the shape and the size of the medial condyle and the lateral condyle of the femur, the prosthesis body is made of CFR-PEEK material, and the two protective shells are made of PE material.

In some embodiments, a coupling structure is formed between the distal femoral prosthesis and the tibial plateau prosthesis, the coupling structure includes a first coupling body, a first groove, a second coupling body, and a pin, the first coupling body is disposed at the distal end of the distal femoral prosthesis, the first groove is located between the first coupling body and is opened at the distal end of the distal femoral prosthesis, one end of the second coupling body is connected to the proximal end of the tibial plateau prosthesis, the other end of the second coupling body is disposed in the first groove, and the pin is inserted between the first coupling body and the second coupling body.

In some embodiments, a spherical body is formed at one end of the second connecting body, an arc-shaped groove is formed at the proximal end of the tibial plateau prosthesis, the spherical body is disposed in the arc-shaped groove, and the spherical body can rotate inside and outside within a preset angle in the arc-shaped groove.

In some embodiments, the sphere is disposed within the arc-shaped groove by a retaining structure; the limiting structure is arranged on two convex parts on two sides of the sphere in a protruding mode, and the two arc-shaped sliding grooves are correspondingly arranged on two sides in the arc-shaped groove, the central angle corresponding to each arc-shaped sliding groove is equal to a preset angle, and the two convex parts are correspondingly matched in a sliding mode in the sliding grooves.

In some embodiments, a first through hole communicated with the first groove is formed in the first connecting body, and a second through hole is formed in the second connecting body; and a lining ring is embedded in the first through hole on the first connecting body.

In some embodiments, the outer surface of the first connecting body is a circular arc surface, and a concave arc surface matched with the outer surface of the first connecting body is formed on the liner; the first groove is an arc-shaped groove, and the outer surface of the second connector is an arc surface.

In some embodiments, the femoral component further comprises a femoral intramedullary canal fixation rod attached to the proximal end of the distal femoral prosthesis, the femoral intramedullary canal fixation rod being made of a CoCrMo alloy material.

In some embodiments, the tibial plateau prosthesis includes a tibial plateau and a tibial medullary cavity positioning stem coupled to a distal end of the tibial plateau, and the liner is disposed at a proximal end of the tibial plateau.

In some embodiments, the tibial plateau and the tibial intramedullary canal positioning rod are integrally formed.

The utility model adopts the above technical scheme, it has following advantage: 1. the utility model provides a contain tumour type knee joint prosthesis of CFR-PEEK material, including thighbone distal end prosthesis, shin bone platform prosthesis and liner, shin bone platform prosthesis is connected with thighbone distal end prosthesis, the liner sets up the near-end at shin bone platform prosthesis, be used for bearing thighbone distal end prosthesis, thighbone distal end prosthesis is made by CFR-PEEK material, shin bone platform prosthesis adopts CoCrMo alloy material to make, the liner adopts PE material to make, CFR-PEEK material has better mechanical strength (including implant weight, compressive strength, yield strength, tensile strength and elastic modulus), make the knee joint prosthesis of this application composite material not only can guarantee to satisfy required mechanical properties, and, the weight of prosthesis alleviates greatly, reduce the load and the wearing and tearing of sclerotin on every side, be favorable to the early stability of prosthesis immediately; moreover, the CFR-PEEK material has good biocompatibility with human skeleton, and the wear particle toxicity is low, so that the prosthesis can effectively avoid the stress shielding effect, reduce the risk of secondary fracture and bone loss, and avoid causing inflammatory reaction of tissues around the prosthesis; in addition, the CFR-PEEK material has very outstanding light permeability, can get rid of the interference of metal artifact, helps the doctor to discover early tumour relapse, can reduce the refraction of putting the ray in the radiotherapy process, helps clinician correctly estimate the radiation dose and protect surrounding tissue, to sum up, the utility model discloses a tumour type knee joint prosthesis has characteristics such as mechanical properties is good, light in weight, light transmissivity are good, overcomes current tumour type knee joint prosthesis's defect.

2. The utility model provides a contain tumour type knee joint prosthesis of CFR-PEEK material, thighbone distal end prosthesis include the prosthesis main part and the cladding of making by CFR-PEEK material in two PE material protecting shells of prosthesis main part both sides for thighbone distal end prosthesis's weight alleviates greatly, and two protecting shells are corresponding with the shape and the size of thighbone internal and external condyle, can change two protecting shells according to different patients, make thighbone distal end prosthesis can be applicable to different patients, improve the suitability of prosthesis.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic diagram of the explosion structure of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

It should be noted that all the directional indicators (such as the near end, the far end, the front end, the rear end, etc.) in the present embodiment are only used to explain the relative positional relationship, the motion situation, etc. of the components in the general operation posture, that is, the side close to the operator is referred to as the near end or the rear end, and the side far away from the operator is referred to as the far end or the front end; if the operating posture changes, the directional indication changes accordingly.

As shown in fig. 1 and fig. 2, the present embodiment provides a tumor-type knee joint prosthesis containing CFR-PEEK material, which includes a femoral component 1 and a tibial component 2; the femoral component 1 comprises a femoral distal prosthesis 11 made of CFR-PEEK material; the tibial component 2 comprises a tibial plateau prosthesis 21 and a gasket 22, the tibial plateau prosthesis 21 is connected with the distal femur prosthesis 11, the gasket 22 is arranged at the proximal end of the tibial plateau prosthesis 21 and used for bearing the distal femur prosthesis 11, the tibial plateau prosthesis 21 is made of a CoCrMo alloy material, and the gasket 22 is made of a PE material.

In the above embodiment, preferably, the distal femoral prosthesis 11 includes a prosthesis main body 111 and two protection shells 112 covering both sides of the prosthesis main body 111, the prosthesis main body 111 is connected with the tibial plateau prosthesis 21, the two protection shells 112 correspond to the shape and size of the medial and lateral condyles of the femur, and the two protection shells 112 can be replaced according to different patients, so as to conveniently adjust the form of the distal femoral prosthesis, so that the distal femoral prosthesis 11 can be suitable for different patients; the prosthesis body 111 is made of CFR-PEEK material and the two sheaths 112 are made of PE material.

In the above embodiment, it is preferable that the distal femoral component 11 and the tibial plateau component 21 form a coupling structure 3 which is engaged with each other to facilitate the coupling between the distal femoral component 11 and the tibial plateau component 21, and specifically, the coupling structure 3 includes a first coupling body 31, a first groove 32, a second coupling body 33 and a pin 34, the first coupling bodies 31 are disposed at the distal end of the distal femoral component 11, the first groove 32 is disposed between the first coupling bodies 31 and is opened at the distal end of the distal femoral component 11, one end of the second coupling body 33 is coupled to the proximal end of the tibial plateau component 21, the other end of the second coupling body 33 is disposed in the first groove 32, the pin 34 is disposed between the first coupling bodies 31 and the second coupling body 33 to couple the distal femoral component 11 and the tibial plateau component 21 together, and the distal femoral component 11 can rotate back and forth relative to the tibial plateau component 21 around the pin 34, to allow flexion and extension movements of the knee prosthesis.

In the above embodiment, preferably, one end of the second connecting body 33 is formed with a sphere, the proximal end of the tibial plateau prosthesis 21 is formed with an arc-shaped groove, the sphere is disposed in the arc-shaped groove, and the sphere can perform an internal and external rotation movement within a preset angle in the arc-shaped groove, and the preset angle can be 3 degrees; therefore, micro-motion exists between the distal femoral prosthesis 11 and the tibial plateau prosthesis 21, which is beneficial to force between knee joints of people in the walking process and reduces stress concentration at the joint between the distal femoral prosthesis 11 and the tibial plateau prosthesis 21.

In the above embodiment, preferably, the sphere is disposed in the arc-shaped groove through the limiting structure; specifically, limit structure is for the protrusion setting two convex parts in the spheroid both sides to and correspond two arc spouts of seting up in the inside both sides of arc recess, and the central angle that the arc spout corresponds equals the predetermined angle, and two convex parts correspond sliding fit in two spouts, then limit structure restriction spheroid takes place the inside and outside rotary motion in the arc recess within the predetermined angle.

In the above embodiment, preferably, to facilitate the pin shaft 34 to be inserted into the first connecting body 31 and the second connecting body 33, a first through hole communicated with the first groove 32 is formed in the first connecting body 31, and a second through hole is formed in the other end of the second connecting body 33.

In the above embodiment, preferably, in order to avoid friction caused by direct contact between the pin 34 and the distal femoral prosthesis 11, a bushing 35 is embedded in the first through hole of the first connecting body 31.

In the above embodiment, preferably, the outer surface of the first connecting body 31 is a circular arc surface, and a concave arc surface matched with the outer surface of the first connecting body 31 is formed on the liner 22; the first groove 32 is an arc-shaped groove, and the outer surface of the second connecting body 33 is an arc surface.

In the above embodiment, preferably, the femoral component 1 further comprises a femoral medullary cavity fixing rod 12 connected to the proximal end of the distal femoral prosthesis 11, the femoral medullary cavity fixing rod 12 is made of CoCrMo alloy material, and the femoral medullary cavity fixing rod 12 can be designed into different models according to the length and width of the medullary cavity of the patient.

In the above embodiment, the tibial plateau prosthesis 21 preferably includes a tibial plateau 211 and a tibial medullary canal positioning rod 212 coupled to a distal end of the tibial plateau, with the liner 22 disposed at a proximal end of the tibial plateau.

In the above embodiment, the tibial plateau 211 and the tibial medullary cavity positioning rod 212 are preferably integrally formed.

The present invention has been described only with reference to the above embodiments, and the structure, arrangement position and connection of the components may be changed. On the basis of the technical scheme of the utility model, the all sides according to the utility model discloses the principle is all not excluded to the improvement that individual part goes on or the transform of equivalence the utility model discloses a protection scope is outside.

Claims

1. A kind of tumor type knee joint prosthesis comprising CFR-PEEK material, characterized by that: comprises a femur component and a tibia component;

2. A tumor-bearing knee prosthesis comprising CFR-PEEK material of claim 1, wherein: the femur far-end prosthesis comprises a prosthesis main body and two protective cases coated on two sides of the prosthesis main body, the prosthesis main body is connected with the tibia platform prosthesis, the two protective cases correspond to the shape and size of the inner condyle and the outer condyle of the femur, the prosthesis main body is made of CFR-PEEK materials, and the two protective cases are made of PE materials.

3. A tumor-bearing knee prosthesis comprising CFR-PEEK material according to claim 1 or 2, wherein: form the connection structure of mutually supporting between thighbone distal end prosthesis and the tibial plateau prosthesis, connection structure includes first connector, first recess, second connector and round pin axle, two first connector sets up relatively the distal end of thighbone distal end prosthesis, first recess is located two set up between the first connector and set up at the distal end of thighbone distal end prosthesis, the one end of second connector is connected the proximal end of tibial plateau prosthesis, the other end setting of second connector is in the first recess, the round pin axle is worn to establish two between first connector and the second connector.

4. A tumor-bearing knee prosthesis comprising CFR-PEEK material according to claim 3, wherein: one of the second connector is provided with a sphere, an arc-shaped groove is formed in the proximal end of the tibial plateau prosthesis, the sphere is arranged in the arc-shaped groove, and the sphere can rotate inside and outside the arc-shaped groove within a preset angle.

5. The tumor-bearing knee joint prosthesis comprising a CFR-PEEK material of claim 4, wherein: the spherical body is arranged in the arc-shaped groove through a limiting structure; the limiting structure is arranged on two convex parts on two sides of the sphere in a protruding mode, and the two arc-shaped sliding grooves are correspondingly arranged on two sides in the arc-shaped groove, the central angle corresponding to each arc-shaped sliding groove is equal to a preset angle, and the two convex parts are correspondingly matched in a sliding mode in the sliding grooves.

6. A tumor-bearing knee prosthesis comprising CFR-PEEK material according to claim 3, wherein: a first through hole communicated with the first groove is formed in the first connecting body, and a second through hole is formed in the second connecting body; and a lining ring is embedded in the first through hole on the first connecting body.

7. A tumor-bearing knee prosthesis comprising CFR-PEEK material according to claim 3, wherein: the outer surface of the first connecting body is a circular arc surface, and a concave arc surface matched with the outer surface of the first connecting body is formed on the liner; the first groove is an arc-shaped groove, and the outer surface of the second connector is an arc surface.

8. A tumor-bearing knee prosthesis comprising CFR-PEEK material of claim 1, wherein: the femur component further comprises a femoral medullary cavity fixing rod connected to the proximal end of the distal femur prosthesis, and the femoral medullary cavity fixing rod is made of a CoCrMo alloy material.

9. A tumor-bearing knee prosthesis comprising CFR-PEEK material of claim 1, wherein: the tibial plateau prosthesis comprises a tibial plateau and a tibial medullary cavity positioning rod connected to the far end of the tibial plateau, and the gasket is arranged at the near end of the tibial plateau.

10. A tumor-bearing knee prosthesis comprising CFR-PEEK material of claim 9, wherein: the tibia platform and the tibia medullary cavity positioning rod are integrally formed.