CN217566460U - Adjustable limiting type wrist joint prosthesis - Google Patents

Abstract

The utility model provides an adjustable restriction type wrist joint false body, include: the wrist intramedullary nail, the connecting piece and the radius intramedullary nail are connected in sequence; two ends of the connecting piece are respectively matched and connected with the wrist bone marrow needle and the radial bone marrow needle awl. The advantages are that: accurate treatment is realized, and the implanted prosthesis of the carpal intramedullary nail can play a role in resisting rotation; furthermore, the movable angle is preset according to the actual requirements of a patient before the prosthesis is prepared, and then the angle hole in the prosthesis is preset, so that the angle of the wrist bone broach and the radius broach can be adjusted, and the clinical requirements are met.

Description

Adjustable limiting type wrist joint prosthesis

Technical Field

The utility model belongs to the technical field of medical prosthesis technique and specifically relates to an adjustable restriction type wrist joint prosthesis.

Background

The wrist joint is one of the most complex structures of the human body and is also one of the most important joints. For a large number of bone defect diseases caused by rheumatic arthritis, bone tumor and traumatic diseases, joint fusion therapy is still adopted at present, along with the development of medical science and technology and the improvement of living standard of people, the requirements on joint quality are gradually improved, when a patient wants to retain the maximum original bone, the joint mobility is recovered to the maximum extent, more and more wrist joint prosthesis replacement operations are applied to clinical treatment at present, non-limiting prostheses mainly adopt traditional structures and materials, and the requirements of the patient on the prosthesis quality cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model provides an adjustable restriction type wrist joint false body, the purpose is overcome above-mentioned a technical defect at least for product stability is good, is convenient for overhaul when being difficult for dislocating.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

an adjustable constrained wrist prosthesis comprising: the wrist intramedullary nail, the connecting piece and the radius intramedullary nail are connected in sequence; two ends of the connecting piece are respectively matched and connected with the wrist bone marrow needle and the radial bone marrow needle awl.

Preferably, the connecting piece comprises a wrist bone connecting section and a radius connecting section in bolted connection with the wrist bone connecting section, one end of the wrist bone connecting section departing from the radius connecting section is connected with the wrist bone marrow awl in a matching manner, and one end of the radius connecting section departing from the wrist bone connecting section is connected with the radius bone marrow awl in a matching manner.

Preferably, a pin hole and an angle hole are sequentially arranged on the insertion part on the carpal connecting section along the length direction of the insertion part; the radius linkage segment deviates from one side of radius broach is equipped with a pair of blade of relative setting, and has seted up two via holes, has seted up two screw holes along its length direction on another blade on its length direction on the blade for the portion of inserting is used for inserting two in the space that the blade constitutes for a bolt pass a via hole in proper order pinhole, a screw hole, another bolt pass a via hole in proper order angle hole, a screw hole, in order to connect the carpal linkage segment with the radius linkage segment.

Preferably, the angle of the angle hole is a preset angle for controlling a connection angle between the wrist broach and the radius broach.

Preferably, a first groove for conical connection with the wrist bone connecting section is formed in one side of the wrist intramedullary nail close to the radius intramedullary nail, and a pair of first clamping grooves are formed in the wrist intramedullary nail along the length direction of the wrist intramedullary nail, so that the pair of first clamping grooves are located on two sides of the first groove;

and a first clamping block which is matched and buckled with the first clamping groove is arranged on the carpal bone connecting section.

Preferably, a second groove for conical connection with the radius connecting section is formed in one side of the radius intramedullary nail close to the wrist intramedullary nail, and a pair of second clamping grooves are formed in the radius intramedullary nail along the length direction of the radius intramedullary nail, so that the pair of second clamping grooves are located on two sides of the second groove;

and a second clamping block which is matched with the second clamping groove in a clamping and connecting manner is arranged on the radius connecting section.

Preferably, the surfaces of the wrist intramedullary nail and the radius intramedullary nail are provided with porous structures.

Preferably, the insertion end of the bolt is provided with a back-proof part.

The utility model discloses an adjustable restriction type wrist joint false body, its advantage is:

1. the utility model can match the shape of the broach with the bone defect size of the patient uniformly by 3D printing the wrist broach and the radius broach customized according to the parts of the patient with serious bone defect, thus realizing accurate treatment and the wrist broach implanted into the prosthesis can play the role of anti-rotation; furthermore, before the prosthesis is prepared, the movable angle is preset according to the actual requirements of a patient, and then the angle hole in the prosthesis is preset, so that the angle adjustment of the wrist bone broach and the radius broach is realized, and the clinical requirements are met;

2. the concrete structural design of the anti-receding part ensures that the opening of the anti-receding part is enlarged by using an auxiliary tool after the prosthesis is implanted, and the bolt is prevented from losing efficacy.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic perspective view of the adjustable and restricted wrist joint prosthesis of the present invention, wherein a porous structure is provided on the wrist broach and the radius broach;

FIG. 2 is a schematic view of an explosion structure of the adjustable and limited wrist joint prosthesis of the present invention, wherein no porous structure is provided on either the wrist broach or the radius broach;

FIG. 3 is a schematic structural view of the carpal tunnel junction;

FIG. 4 is a schematic view of the structure of the radial connecting segment;

FIG. 5 is a schematic view of the connection structure of the carpal attachment section and the radius attachment section;

FIG. 6 is a schematic view of the anti-receding portion;

FIG. 7 and FIG. 8 are schematic perspective views of the wrist broach and the radius broach respectively provided with porous structures;

wherein:

the wrist bone broach is 1, a first groove 11 and a first clamping groove 12;

the radius intramedullary nail 2, a second groove 21 and a second clamping groove 22;

the wrist bone connecting section 3, the inserting part 31, the pin hole 32, the angle hole 33 and the first clamping block 34;

the radius connecting section 4, the blade 41, the through hole 42, the threaded hole 43 and the second clamping block 44;

porous structure 5, bolt 6, insertion end 61, anti-receding portion 62.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless explicitly defined otherwise.

In order to facilitate the adjustment of the angle between the medullary carpal needle and the medullary radial needle, as shown in fig. 1-8, the present invention provides an adjustable and limited wrist joint prosthesis, comprising: a wrist intramedullary nail 1, a connecting piece and a radius intramedullary nail 2 which are connected in sequence; two ends of the connecting piece are respectively in conical fit connection with the wrist bone broach 1 and the radius bone broach 2.

In the specific implementation process, the connecting piece comprises a wrist bone connecting section 3 and a radius bone connecting section 4 in bolt connection with the wrist bone connecting section 3, one end of the wrist bone connecting section 3, which deviates from the radius bone connecting section 4, is in conical fit connection with the wrist bone broach 1, and one end of the radius bone connecting section 4, which deviates from the wrist bone connecting section 3, is in conical fit connection with the radius bone broach 2.

When the wrist bone broach 1 is used, a second metacarpal bone prosthesis is inserted, the radius broach 2 is inserted into the radius prosthesis, and the wrist bone broach 1 is connected with the radius broach 2 through a connecting piece.

The wrist intramedullary nail 1 and the radius intramedullary nail 2 are made of 3D printed titanium alloy materials, the surfaces of the wrist intramedullary nail 1 and the radius intramedullary nail 2 are in a porous structure 5 form, the wrist intramedullary nail is long in length, the pore diameters of the wrist intramedullary nail are unevenly distributed, the wrist intramedullary nail 1 is applied to a wrist bone defect part, the radius intramedullary nail 2 is applied to a radius bone defect part, and the surface of the wrist intramedullary nail 1 is provided with a porous structure 5 prosthesis, so that the ingrowth of bone tissues and cell tissues is facilitated; the prosthesis is tightly combined with the cancellous bone, and meanwhile, the friction force is increased, so that the improvement of the initial stability is facilitated; the porous structures 5 arranged on the wrist bone marrow needle 1 and the radius marrow needle 2 are preferably porous bone trabecula structures and are composed of multilayer structures, and the pore diameter, the silk diameter and the porosity of each layer of structure are different so as to enhance the ingrowth of bone tissues and cell tissues;

in a specific embodiment, the insertion portion 31 of the carpal tunnel 3 is sequentially provided with a pin hole 32 and an angle hole 33 along the length direction thereof; one side that radius linkage segment 4 deviates from radius broach 2 is equipped with a pair of blade 41 of relative setting, and has seted up two via holes 42 along its length direction on blade 41, has seted up two screw holes 43 along its length direction on another blade 41, insertion portion 31 is used for inserting two in the space that blade 41 constitutes for a bolt 6 passes a via hole 42 in proper order pinhole 32, a screw hole 43, another bolt 6 pass a via hole 42 in proper order angle hole 33, a screw hole 43, in order to connect wrist bone linkage segment 3 with radius linkage segment 4.

Further, the angle of the angle hole 33 is a preset angle for controlling the connection angle between the wrist broach 1 and the radius broach 2, i.e. the opening of the angle hole 33 towards one end of the through hole 42 is larger than the opening towards one end of the threaded hole 43 (as shown in fig. 3).

In a specific embodiment, a first groove 11 for taper-fitting connection with the carpal bone connecting section 3 is formed in one side of the intramedullary nail 1 close to the radius intramedullary nail 2, and a pair of first clamping grooves 12 are further formed in the intramedullary nail 1 along the length direction thereof, so that the pair of first clamping grooves 12 are located at two sides of the first groove 11 and are communicated with the same; the first clamping block 34 which is in adaptive buckle connection with the first clamping groove 12 is arranged on the carpal bone connecting section 3, the connection stability between the carpal bone broach 1 and the connecting piece is further enhanced, and in more detail, the outer wall of the first clamping block 34 is flush with the outer wall of the radius connecting section 3.

A second groove 21 for conical connection with the radius connecting section 4 is formed in one side, close to the wrist intramedullary nail 1, of the radius intramedullary nail 2, and a pair of second clamping grooves 22 located inside the radius intramedullary nail 2 are further formed in the radius intramedullary nail 2 along the length direction of the radius intramedullary nail, so that the pair of second clamping grooves 22 are located on two sides of the second groove 21 and are communicated with the second groove; the radius connecting section 4 is provided with a second clamping block 44 which is matched with and buckled with the second clamping groove 22, so that the connection stability between the radius broach 2 and the connecting piece is further enhanced, and in more detail, the second clamping block 44 is covered in the radius connecting section 4.

In specific operation, the insertion end 61 of the bolt 6 is provided with a backing-proof part 62 to avoid and prevent bolt failure; more specifically, the insertion end 61 of the bolt 6 is provided with an open slot, the open slot faces to the side away from the bolt cap and is coaxial with the bolt 6, and after the prosthesis is implanted, an auxiliary tool is inserted into the open slot, so that the open slot is enlarged, and the outer diameter of the insertion end 61 of the bolt 6 is increased, thereby achieving the purpose of avoiding failure.

The structures and principles not explicitly described in the present invention are available to those skilled in the art through conventional technical means, and therefore are not described in detail.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. Adjustable restriction type wrist joint prosthesis which characterized in that: comprises a wrist bone broach (1), a connecting piece and a radius broach (2) which are connected in sequence; two ends of the connecting piece are respectively in conical fit connection with the wrist bone broach (1) and the radius broach (2).

2. The adjustable constrained wrist prosthesis of claim 1, wherein: the connecting piece comprises a wrist bone connecting section (3) and a radius connecting section (4) connected with the wrist bone connecting section through bolts, one end, deviating from the radius connecting section (4), of the wrist bone connecting section (3) is in conical connection with the wrist bone broach (1), and one end, deviating from the wrist bone connecting section (3), of the radius connecting section (4) is in conical connection with the radius broach (2).

3. The adjustable constrained wrist prosthesis of claim 2, wherein: a pin hole (32) and an angle hole (33) are sequentially arranged on the insertion part (31) on the carpal connecting section (3) along the length direction of the insertion part; one side that radius linkage segment (4) deviates from radius broach (2) is equipped with a pair of blade (41) of relative setting, and has seted up two via holes (42) along its length direction on blade (41), has seted up two screw holes (43) along its length direction on another blade (41), insert portion (31) are used for inserting two in the space that blade (41) constitute for a bolt passes a via hole (42) in proper order pinhole (32), a screw hole (43), and another bolt passes a via hole (42) in proper order angle hole (33), a screw hole (43) in proper order, in order to connect wrist linkage segment (3) with radius linkage segment (4).

4. The adjustable constrained wrist prosthesis of claim 3, wherein: the angle of the angle hole (33) is a preset angle and is used for controlling the connection angle between the wrist intramedullary nail (1) and the radius intramedullary nail (2).

5. The adjustable constrained wrist prosthesis of claim 2, wherein: a first groove (11) for conical connection with the wrist bone connecting section (3) is formed in one side, close to the radius broach (2), of the wrist bone broach (1), and a pair of first clamping grooves (12) are further formed in the wrist bone broach (1) along the length direction of the wrist bone broach, so that the pair of first clamping grooves (12) are located on two sides of the first groove (11) and are communicated with the first groove;

a first clamping block (34) which is matched, buckled and connected with the first clamping groove (12) is arranged on the carpal bone connecting section (3).

6. The adjustable constrained wrist prosthesis of claim 2, wherein: a second groove (21) for conical connection with the radius connecting section (4) is formed in one side, close to the wrist bone broach (1), of the radius broach (2), and a pair of second clamping grooves (22) located in the radius broach (2) are further formed in the radius broach along the length direction of the radius broach, so that the pair of second clamping grooves (22) are located on two sides of the second groove (21) and are communicated with the second groove;

and a second clamping block (44) which is matched, buckled and connected with the second clamping groove (22) is arranged on the radius connecting section (4).

7. The adjustable constrained wrist prosthesis of claim 1, wherein: the surfaces of the wrist bone broach (1) and the radius broach (2) are respectively provided with a porous structure (5).

8. The adjustable constrained wrist prosthesis of claim 3, wherein: an insertion end (61) of the bolt is provided with a retreat prevention part (62).

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