# US 11,992,407 B1 · Multi-layered composite bionic self-retaining prosthesis for femoral shaft

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- Number: US 11,992,407 B1
- Document ID: US11992407B1
- Status: Granted
- Kind: B1
- Application number: 18/236,983
- Filed: 2023-08-23
- Granted: 2024-05-28
- Earliest claimed: 2023-02-15
- Assignees: Jilin University
- Applicants: Jilin University
- Inventors: Zhihui Qian; Yue Lu; Jincheng Wang; Lei Ren; Hao Chen; Kunyang Wang; Kaize Wang; Guangsheng Song; Youhao Diao; Luquan Ren
- Web page: https://patentgrep.com/patent/US11992407B1

## CPC

- A61F 2/28: Bones
- A61F 2/36: Femoral heads {; Femoral endoprostheses}
- A61F 2/38: for elbows or knees
- A61L 27/06: Titanium or titanium alloys
- A61L 27/56: Porous materials, {e.g. foams or sponges}
- G06T 17/00: Three-dimensional [3D] modelling for computer graphics
- A61F 2210/0076: multilayered, e.g. laminated structures
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

Disclosed is a multi-layered composite bionic self-retaining prosthesis for a femoral shaft, including a scaffold, an upper bone plate, and a lower bone plate. An upper outer side of the scaffold is fixed to a low inner side of the upper bone plate, and a lower outer side of the scaffold is fixed to an upper inner side of the lower bone plate. The scaffold includes an upper trabeculae layer, a middle cortical bone layer and a lower trabeculae layer. The middle cortical bone layer is a multi-layered composite structure which includes an outer frame layer, a middle filling layer and an inner frame layer. The upper and lower bone plates each include an inner trabeculae layer and an outer reinforcement layer.

## Claims

### Claim 1

A multi-layered composite bionic self-retaining prosthesis for a femoral shaft, comprising:
a scaffold, an upper bone plate, and a lower bone plate,
wherein:
an upper outer side of the scaffold is fixed to a low inner side of the upper bone plate, and a lower outer side of the scaffold is fixed to an upper inner side of the lower bone plate;
the scaffold comprises an upper trabeculae layer, a middle cortical bone layer, and a lower trabeculae layer; the middle cortical bone layer is of a multi-layered composite structure which comprises an outer frame layer, a middle filling layer, and an inner frame layer;
the upper bone plate comprises a first inner trabeculae layer and a first outer reinforcement layer, and the lower bone plate comprises a second inner trabeculae layer and a second outer reinforcement layer;
the scaffold is cylindrical;
the upper bone plate and the lower bone plate are arc-shaped;
a cell structure of the middle filling layer is of a body-centered cubic structure, with a porosity from 60% to 70%; and
a cell structure of each of the outer frame layer and the inner frame layer is of a glass sponge-mimicking bidiagonal structure, with a porosity from 70% to 90%.

### Claim 2 (depends on 1)

The multi-layered composite bionic self-retaining prosthesis for a femoral shaft according to claim 1, wherein each of the upper trabeculae layer, the lower trabeculae layer, the first inner trabeculae layer and the second inner trabeculae layer is of a random porous structure designed using a Voronoi-Tessellation method, a porosity of the random porous structure is from 50% to 90%, and a pore size of the random porous structure is from 500 μm to 700 μm.

### Claim 3 (depends on 2)

The multi-layered composite bionic self-retaining prosthesis for a femoral shaft according to claim 2, wherein the porosity of the random porous structure is from 60% to 80%.

### Claim 4 (depends on 1)

The multi-layered composite bionic self-retaining prosthesis for a femoral shaft according to claim 1, wherein ⅓ and ⅔ of a length of each of the upper bone plate and the lower bone plate are each provided with a circular screw hole for providing a mounting position for a screw, to fix the prosthesis to a bone defect to avoid poor recovery caused by prosthesis displacement.

### Claim 5 (depends on 1)

The multi-layered composite bionic self-retaining prosthesis for a femoral shaft according to claim 1, wherein each of the upper trabeculae layer, the lower trabeculae layer, the first inner trabeculae layer and the second inner trabeculae layer is made of a Ti—Ta alloy material.

### Claim 6 (depends on 1)

The multi-layered composite bionic self-retaining prosthesis for a femoral shaft according to claim 1, wherein each of the middle cortical bone layer, the first outer reinforcement layer and the second outer reinforcement layer is made of a Ti6Al4V material.