CN217645386U

CN217645386U - Memory fixed type bionic phalangeal joint replacement part

Info

Publication number: CN217645386U
Application number: CN202123224841.5U
Authority: CN
Inventors: 唐志方; 郭民政; 李川; 徐昕明; 叶涛; 徐永清
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-10-25
Anticipated expiration: 2031-12-21

Abstract

The utility model discloses a memory fixed bionic phalanx joint replacement part, which consists of a phalanx fixing part body and functional parts thereof, and comprises a phalanx matching surface, a phalanx internal supporting part and a phalanx internal fixing tooth; the main view surface of the phalanx fixing piece body is in a pi shape, the front end of the phalanx fixing piece body is provided with a phalanx matching surface matched with the metacarpal joint massage and pad, and the rear part of the phalanx fixing piece body is symmetrically provided with phalanx internal supporting parts and phalanx internal fixing teeth; the utility model is based on the human engineering structure design and the Ni-Ti memory alloy manufacture, which gives full play to the functional advantages of the two, so that the bionic metacarpophalangeal joint replacement part has better conformality and good mechanical matching; the unique memory function makes the orthopedic internal fixation device have the unique continuous automatic pressurization function, and the continuous cohesion provides good biomechanical conditions for the healing of the affected bone, so that the bone can not be loosened due to the healing of the bone and the movement of a human body. The utility model discloses simple structure, it is simple and convenient to use, is of value to clinical application and popularization.

Description

Memory fixed type bionic phalangeal joint replacement part

Technical Field

The utility model belongs to the technical field of orthopedics apparatus, concretely relates to fixed bionical phalangeal joint replacement spare of memory that rational in infrastructure, assemble portably.

Background

The hand is the most important organ of labor of a person, and the metacarpophalangeal joints are important structures of the hand. People are difficult to avoid the fracture of palmar bones and phalanges caused by accidents in the daily production and life process, or the limited movement of the palmar joints and the phalanges caused by diseases such as rheumatoid diseases and the like, even the normal physiological function is lost. For patients with damaged metacarpophalangeal cartilage, stiff joints and ineffective surgical release or joint function recovery failure, joint fusion, free implantation of metatarsophalangeal joints and artificial finger joint replacement can be selected for treatment. Joint fusion is the most common treatment mode with relatively simple and convenient operation and low cost at present, but the joint function is seriously lost; the free transplantation of the metatarsophalangeal joint can keep the joint mobility to the maximum extent, the function of a foot after operation has no obvious influence, but has the defects of higher microsurgical technical requirement on an operator, larger operative wound, incapability of joint transplantation due to multiple joint lesions and the like; most patients, especially young patients, want to solve the pain and simultaneously retain the joint function to the maximum extent and meet the aesthetic requirements to the maximum extent, so that the reconstruction of metacarpophalangeal joints, the recovery of mobility, the relief of joint pain and the maintenance of beautiful appearance become the key points of attention of current hand surgeons, and are difficult problems of hand surgery.

The best treatment for improving metacarpophalangeal joint function is joint replacement with an artificial prosthesis, however, replacement with an existing prosthesis not only has poor initial stability, but also has poor long-term stability due to poor bone ingrowth. After long-term follow-up after the existing prosthesis replacement, the defects are more obvious, so that a mature metacarpophalangeal joint prosthesis is not designed yet. The reasons for this are poor conformity of the articular surfaces of the prosthesis, unreasonable connection structure of the joint surfaces, and poor stability of the intra-medullary part, which leads to the above-mentioned undesirable effects. The traditional finger joint prosthesis needs to be matched with a marrow cavity, the finger joint prosthesis and a human phalanx are pressed and pressed into the marrow cavity after being processed by a reamer or a file in the early stage, the existing finger joint prosthesis is complex in structure, is not easy to be pressed into the marrow cavity in a narrow space, is easy to loosen, is not firm to mount, even can cause the fracture of the phalanx, and is low in service life. The utility model discloses the people has developed the bionical metacarpal bone joint replacement piece (applied for national patent utility model or utility model) patent of high flexibility ratio according to long-term clinical practice, has also gained better clinical application effect. However, there is a drawback that the operation is relatively cumbersome. Aiming at the defects of the prior art, the inventor develops a bionic knuckle replacement part which is more in accordance with the human body biomechanics structure, good in mechanical matching, low in cost, good in conformability and resistant to fixation, replaces a prosthesis or a replacement part in the prior art, and is an effective way for overcoming the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a more accord with human biomechanics structure, machinery cooperation nature is good, low cost's fixed bionical metacarpophalangeal joint replacement spare of memory

The utility model aims at realizing the purpose, the utility model discloses a memory fixed bionic phalanx joint replacement, the replacement comprises phalanx mounting body and functional unit, includes by phalanx fitting surface, phalanx internal supporting part and phalanx internal fixing tooth, the main viewing surface of phalanx mounting body is "pi" shape, its front end is provided with the phalanx fitting surface that rubs and fills up with metacarpal joint, the phalanx mounting body rear portion symmetry sets up a pair of opposite-side abduction phalanx internal supporting part; the outer side of the front section of the phalangeal internal support part is provided with phalangeal internal fixing teeth; the side view of the phalanx fixing piece body is in a T shape, the middle part is an phalanx internal supporting part, and the front section of the phalanx fixing piece body is provided with phalanx internal fixing teeth; the metacarpal joint massage pad and the phalangeal fixing piece body are matched in an inserting manner.

The utility model is based on the human engineering structure design and the Ni-Ti memory alloy manufacture, the technical advantages of the two are fully exerted, so that the bionic metacarpophalangeal joint replacement part has better conformability, better conforms to the human body biomechanics structure and has good mechanical matching; the Ni-Ti memory alloy component not only enables the operation to be simpler and faster, but also does not need to use auxiliary instruments such as screws, steel wires and the like, and reduces the manual injury operations such as drilling, wedging and the like to the minimum; the unique memory function makes the orthopedic internal fixation device have the unique continuous automatic pressurization function, the continuous cohesion force provides good biomechanics conditions for the healing of the affected bone, the loosening of the affected bone due to the healing of the bone and the movement of a human body can not be caused, and the treatment and prognosis of a patient are reduced. The utility model discloses simple structure, it is simple and convenient to use, is of value to clinical application and popularization.

Drawings

FIG. 1 is a front view of the phalangeal mounting assembly of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is an expanded view of the phalangeal securing member of FIG. 1;

FIG. 4 is a schematic view of the structure of the phalangeal joint massage and pad;

FIG. 5 is a left side view of FIG. 4;

FIG. 6 is a bottom view of FIG. 4;

fig. 7 is a schematic view of the half-section of the working state of the phalangeal fixing member of the present invention.

In the figure: 1-phalangeal fixing member body; 11-a phalanx mating surface; 12-combining pile holes; 13 to an inner support portion of the phalanx; 14-fixing teeth in phalanges; 2, massaging and cushioning metacarpal joints; massaging and kneading the metacarpal bones; 22-phalanx combination piles; 3, twisting a wire; r-arc radius of the part; w-width of the part; l-length of the part; d is the tooth width.

Detailed Description

The following description of the present invention is provided with reference to the accompanying drawings, which are not intended to limit the present invention in any way, and any alterations or replacements made based on the teachings of the present invention are all within the protection scope of the present invention.

As shown in fig. 1 to 6, the memory fixed type bionic phalanx joint replacement part of the utility model comprises a phalanx fixing part body 1 and functional components thereof, and comprises a phalanx matching surface 11, a phalanx internal supporting part 13 and a phalanx internal fixing tooth 14, and is characterized in that the main viewing surface of the phalanx fixing part body 1 is in a shape of pi, the front end of the phalanx fixing part body is provided with the phalanx matching surface 11 matched with a metacarpal joint friction pad 2, and the phalanx fixing part body 1 is symmetrically provided with a pair of phalanx internal supporting parts 13 which are oppositely unfolded at the rear part; the inner phalanx fixing teeth 14 are arranged on the outer side of the front section of the inner phalanx supporting part 13; the side view of the phalangeal fixing body 1 is T-shaped, the middle part is a phalangeal supporting part 13, and the front part is provided with phalangeal fixing teeth 14; the metacarpal joint massage cushion 2 is matched with the phalangeal fixing piece body 1 in an inserting way.

Figures 1 and 2 show the structural relationship of the phalangeal mounting body. A combination pile hole 12 is arranged on the plane end surface of the phalanx fixing piece body 1, the phalanx inner supporting part 13 is symmetrically arranged at the rear part of the combination pile hole, and phalanx inner fixing teeth 14 are arranged at the outer side of the front section of the phalanx inner supporting part 13; one side of the metacarpal joint massage cushion 2 is provided with a metacarpal bone massage surface 21, and the other side is provided with a phalangeal joint binding post 22 matched with the binding post hole 12 on the phalangeal fixing piece body 1;

the phalangeal mating surface 11 has a transverse width W2; the length L2 of the center of the top surface of the phalanx matching surface 11; the extended length of the two wings of the phalangeal mating surface 11 is L1; the width of the phalangeal supporting part 13 is W1; W1/W2 is 1:2 to 5.

The radius R1 of the arc surface of the four corners of the phalanx matching surface 11 is 60 to 100mm; the radius R3 of the front end face arc surface/rear end arc surface of the finger internal fixation tooth 14 is 10 to 30mm; the tooth pitch d, d/W2 of the finger internal fixation teeth 14 is 1.2 to 2.0.

The tooth valley arc radius R4 of the fixing teeth 14 in the phalanx is 3 to 8mm; the height H1 of the fixing teeth 14 in the phalanx/the width W2 of the supporting part 13 in the phalanx is 1; the ratio of the length L4 of the section of the phalangeal internal fixation tooth 14 to the length L3 of one side of the phalangeal internal support part 13 is 1.

The phalanx fixing piece body 1 is a three-dimensional structural piece which is integrally cut, formed and symmetrically bent into a working state according to a process, and the top surface of the phalanx matching surface 11 is a plane; the phalangeal matching surface 11 is symmetrically provided with binding pile holes 12 on the two wing transverse axes, and is tightly matched with the metacarpal joint massage and phalangeal binding piles 22 arranged on the pad 2; the phalange internal support parts 13 are symmetrically bent into a pi shape, square shoulders in arc transition are formed at the joints of the phalange matching surfaces 11, the middle-section abduction arc opening angle alpha 2 of the phalange internal support parts 13 on the two sides is 2.5 to 3.5 degrees, the lower-section arc abduction is carried out, and the arc radius is 60 to 120mm.

The joint of the phalangeal supporting part 13 and the phalangeal internal fixation tooth 14 is twisted by 90 degrees, so that the phalangeal internal fixation tooth 14 is spread outwards.

Fig. 4 to 6 show the structural relationship of the phalanx fixing body. One surface of the metacarpal joint massage cushion 2 is a plane, and the radius R8 of a four-corner arc is 60 to 100mm; the phalanx combination piles 22 are symmetrically arranged on the finger fixing piece body and are tightly matched with the combination pile holes 12 arranged on the phalanx matching surface 11 of the finger fixing piece body 1; the other side is provided with a metacarpal bone friction surface 21 which is in friction fit with the phalangeal matching surface 11; the radius R6 of the arc of the metacarpal massage surface 21 is 50 to 70mm.

The phalangeal joint replacement part is made of a memory alloy material, and after the phalangeal joint replacement part is implanted into a body and automatically reshaped at body temperature, the phalangeal joint replacement part respectively extends into the inner support part of the medullary cavity to be tightly attached to the inner wall of the medullary cavity so as to form a fixed connection fit for continuously applying force.

Fig. 7 shows the working state of the phalangeal joint of the present invention, which is cooperated with the metacarpal bone fixing member, the joint massage member and the pad to form an integral structural component of the metacarpophalangeal joint replacement member.

The utility model discloses theory of operation and working process:

the utility model discloses based on human biomechanics principle for whole and the fitting surface of bionical metacarpophalangeal joint replacement part more accord with bone structure characteristic, guarantee simultaneously that the replacement part combines more firmly with the osteotomy end, and initial stability is better, and the bone growth of being more convenient for keeps the long-term stability of part rigid coupling and firm, reduces patient's misery.

For the patients with fracture of the metacarpophalangeal joints or rheumatism, when the utility model is used for replacing the components, the proper model is firstly selected and matched, and the model is especially matched for the metacarpophalangeal joints of the hands. Firstly, putting a phalangeal fixing piece body 1 into saline water obtained at 0 to 5 ℃ to lose memory, then respectively putting the phalangeal fixing piece body 1 and the phalangeal fixing piece body into a metacarpal medullary cavity and a phalangeal medullary cavity, tightly matching a metacarpal joint massage pad 2 with the phalangeal fixing piece body 1 through a combination pile, matching the metacarpal joint massage pad 2 with a metacarpal bone massage and a facial patch of the metacarpal fixing piece body, and finally carrying out conventional operation treatment. Under the temperature environment of a human body in vivo, the palm bone fixing part body and the finger bone fixing part body made of the memory alloy are unfolded in a complex way by the internal supporting part, the internal fixing teeth are tightly attached to the inner wall of a medullary cavity and continuously apply force to keep a tight fit state, and the implant and the human skeleton are fused and symbiotically harmoniously along with the growth of surrounding tissues (structures).

Claims

1. A memory fixed bionic phalanx joint replacement part comprises a phalanx fixing part body (1) and functional components thereof, and comprises a phalanx matching surface (11), a phalanx inner supporting part (13) and phalanx inner fixing teeth (14), and is characterized in that the main view surface of the phalanx fixing part body (1) is in a pi shape, the front end of the phalanx fixing part body is provided with a phalanx matching surface (11) matched with a metacarpal joint friction pad (2), and the rear part of the phalanx fixing part body (1) is symmetrically provided with a pair of phalanx inner supporting parts (13) which are oppositely unfolded; the outer side of the front section of the phalanx internal supporting part (13) is provided with phalanx internal fixing teeth (14); the side view of the phalanx fixing piece body (1) is T-shaped, the middle part is an phalanx internal supporting part (13), and the front section is provided with an phalanx internal fixing tooth (14); the metacarpal joint massage cushion (2) is matched with the phalangeal fixing piece body (1) in an inserting manner.

2. The memory fixing type bionic phalangeal joint replacement part according to claim 1, characterized in that the phalangeal joint body (1) has a plane end surface provided with a coupling hole (12), a phalangeal inner portion (13) is symmetrically provided at the rear portion thereof, and an phalangeal inner fixing tooth (14) is provided at the outer side of the front section of the phalangeal inner portion (13); one side of the metacarpal joint massage cushion (2) is provided with a metacarpal bone massage surface (21), and the other side is provided with a phalangeal joint binding post (22) matched with the binding post hole (12) on the phalangeal joint fixing piece body (1).

3. The memory-fixed biomimetic phalangeal joint replacement according to claim 1, characterized in that the phalangeal mating surface (11) has a transverse width W2; the length L2 of the center of the top surface of the phalanx matching surface (11); the extended length of both wings of the phalanx mating surface (11) is L1; the width of the phalangeal inner support portion (13) is W1; W1/W2 is 1:2 to 5.

4. The memory fixed bionic phalanx joint replacement part according to claim 1 or 3, wherein the radius R1 of the arc surface at the four corners of the phalanx matching surface (11) is 60 to 100mm; the radius R3 of a front end face arc face/rear end arc face of the phalanx internal fixation tooth (14) is 10 to 30mm; the tooth pitch d, d/W2 of the finger internal fixation teeth (14) is 1.2 to 2.0.

5. The memory fixed bionic phalangeal joint replacement according to claim 1 or 2, characterized in that the radius of the arc of the valley of the fixed teeth (14) in the phalanges, R4, is 3 to 8mm; the tooth height H1 of the fixing teeth (14) in the phalanx/the width W2 of the supporting part (13) in the phalanx is 1; the ratio of the length L4 of the fixing tooth (14) section in the phalanx to the length L3 of one side of the supporting part (13) in the phalanx is 1.

6. The memory fixed bionic phalangeal joint replacement part according to claim 1 or 2, characterized in that the phalangeal fixing part body (1) is a three-dimensional structural member which is integrally cut and formed and is bent symmetrically according to the process to work, and the top surface of the phalangeal mating surface (11) is a plane; the phalanx matching surface (11) is symmetrically provided with combining pile holes (12) on the transverse axes of the two wings and is tightly matched with phalanx combining piles (22) arranged on the metacarpal joint massage and pad (2); the phalange internal supporting parts (13) are symmetrically bent into a pi shape, arc transition square shoulders are formed at the joints of the phalange internal supporting parts and the phalange matching surfaces (11), the middle-upper-section abduction arc opening angle alpha 2 of the phalange internal supporting parts (13) on two sides ranges from 2.5 degrees to 3.5 degrees, the lower-section arc abduction is performed, and the arc radius is 60 to 120mm.

7. The memory fixed bionic phalangeal joint replacement member according to claim 1, characterized in that the phalangeal supporting portion (13) is twisted 90 ° at the twisting line (3) combined with the phalangeal fixing teeth (14) to expand the phalangeal fixing teeth (14) outward.

8. The memory fixed bionic phalangeal joint replacement part according to claim 1, 2, 3 or 7, characterized in that the phalangeal joint replacement part is made of memory alloy material, and after being implanted in vivo and after the memory alloy part is automatically reshaped at body temperature, the inner part extending into medullary cavity respectively is tightly attached to the inner wall of medullary cavity to form a rigid connection fit for continuous force application.

9. The memory fixed bionic phalangeal joint replacement part according to claim 4, characterized in that the phalangeal joint replacement part is made of memory alloy material, and after being implanted in vivo and automatically reshaped at body temperature, the memory alloy parts respectively extend into the inner part of the medullary cavity and tightly fit with the inner wall of the medullary cavity to form a permanent force-applying fixation fit.

10. The memory fixed type bionic phalangeal joint replacement part according to claim 5, characterized in that the phalangeal joint replacement part is made of memory alloy material, and after being implanted in vivo and after the memory alloy part is automatically reshaped at body temperature, the memory alloy part respectively extends into the medullary cavity to be tightly attached to the inner wall of the medullary cavity, so as to form a fixed connection fit for continuously applying force.

11. The memory fixed bionic phalangeal joint replacement part according to claim 6, characterized in that the phalangeal joint replacement part is made of memory alloy material, and after being implanted in vivo and automatically reshaped at body temperature, the memory alloy parts respectively extend into the inner part of medullary cavity and tightly fit with the inner wall of medullary cavity to form a continuous force application fixed joint.

12. The memory fixed bionic phalangeal joint replacement part according to claim 1, characterized in that one side of said metacarpal joint massage pad (2) is a plane, and the radius of the arc of its four corners R8 is 60 to 100mm; phalanx combination piles (22) are symmetrically arranged on the finger fixing piece body and are tightly matched with combination pile holes (12) arranged on a phalanx matching surface (11) of the finger fixing piece body (1); the other side is provided with a metacarpal bone friction surface (21) which is in friction fit with a phalangeal matching surface (11); the radius R6 of the arc of the metacarpal massage surface (21) is 50 to 70mm.