CN215839734U - Total wrist joint prosthesis - Google Patents
Total wrist joint prosthesis Download PDFInfo
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- CN215839734U CN215839734U CN202121184264.9U CN202121184264U CN215839734U CN 215839734 U CN215839734 U CN 215839734U CN 202121184264 U CN202121184264 U CN 202121184264U CN 215839734 U CN215839734 U CN 215839734U
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Abstract
The utility model provides a total wrist joint prosthesis, and relates to the technical field of medical instruments. The total wrist joint prosthesis comprises a metacarpal side fixing prosthesis arranged at a third metacarpal bone and a radial side fixing prosthesis arranged at a radial bone; one end of the radius side fixing prosthesis can be arranged at the radius, and the other end of the radius side fixing prosthesis is provided with a metal hinging seat connected with the metacarpal side fixing prosthesis; one end of the metacarpal bone side fixing prosthesis can be arranged at a third metacarpal bone, the other end of the metacarpal bone side fixing prosthesis is provided with a hinged ball head hinged with the hinged seat, and the hinged ball head is coated with a high-crosslinking high-molecular-weight polyethylene coating. The technical effect of little influence on the functions of the hands after operation is achieved.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to a total wrist joint prosthesis.
Background
Applicable diseases for wrist joint prostheses: 1. the SNAC/SLAC carpal arthritis does not affect the first and second joints. 2. Ischemic necrosis of the lunar bone (kinebock disease) does not involve the cephalic and lunar articular surfaces. 3. Non-inflammatory arthritis such as rheumatoid arthritis limited to the radial and wrist joints. For patients who have affected the articular surfaces on both sides of the radial wrist joint but have not progressed to the middle wrist joint, wrist joint prostheses have various forms and types. Although the operation can achieve the effect of relieving pain by removing the diseased part, the painless wrist joint is obtained, but the accompanying partial joint fusion can lose partial wrist joint mobility, the mobility of the lunula joint of the patient is only reserved after the four-corner fusion, and the postoperative wrist-ulnar pain is more easily caused by the transfer of the wrist joint force line. The other soft tissue plasty is unable to avoid the loss of the wrist height, which further affects the smooth course of the tendons of the external muscles (flexion and extension of the wrist, flexion and extension of the finger) and the function of the hand. The total wrist fusion procedure lost all of the radial wrist joint mobility.
The existing wrist joint prosthesis generally uses a metal-metal interface (MOM interface), which causes high incidence of postoperative loosening, dislocation, metal ion contamination and the like due to technical problems, and meanwhile, the MOM interface can cause inflammatory pseudotumor of surrounding tissues, necrosis of bones around the prosthesis and potential metal ion toxicity. Metal corrosion of the prosthesis in combination with the taper may also cause local soft tissue reactions, as well as corrosion cracking of the neck and release of metal ions, further damaging the patient's body after surgery.
Therefore, it is an important technical problem to be solved by those skilled in the art to provide a total wrist prosthesis having little post-operative effect on hand function.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a total wrist joint prosthesis to solve the technical problem of great influence on postoperation hands in the prior art.
In a first aspect, embodiments of the present invention provide a total wrist joint prosthesis, including a metacarpal side fixation prosthesis for placement at a third metacarpal bone and a radial side fixation prosthesis for placement at a radial bone;
one end of the radius side fixing prosthesis can be arranged at the radius, and the other end of the radius side fixing prosthesis is provided with a metal hinging seat connected with the metacarpal side fixing prosthesis;
the one end of the fixed false body of metacarpal bone side can set up in third metacarpal bone department, the other end be provided with articulated bulb of articulated seat, it has high cross-linking high molecular weight polyethylene coating to coat on the articulated bulb.
In combination with the first aspect, the embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the radial bone side fixing prosthesis is clamped with both the hinge seats.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the radial fixation prosthesis adopts a 3D printed metal trabecular bone structure;
the hinged seat is made of cobalt-chromium-molybdenum alloy.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the metacarpal side fixing prosthesis is clamped with both the articulating ball heads.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the metacarpal side fixed prosthesis is made of a titanium alloy material, and an outer wall of the metacarpal side fixed prosthesis is frosted;
the articulated ball head is made of high-crosslinking high-molecular-weight polyethylene.
In combination with the first aspect, the embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the porosity of the radial fixation prosthesis is between 40% and 80%.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the aperture of the radial fixation prosthesis is between 600 μm and 1000 μm.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the elastic modulus of the radial fixation prosthesis is between 0.5GPa and 3 GPa.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the elastic modulus of the metacarpal side fixed prosthesis is between 10GPa and 20 GPa.
In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a rotation angle of both the metacarpal side fixing prosthesis and the radial side fixing prosthesis is 65 to 80 degrees.
Has the advantages that:
the embodiment of the utility model provides a total wrist joint prosthesis, which comprises a metacarpal side fixing prosthesis and a radial side fixing prosthesis, wherein the metacarpal side fixing prosthesis is used for being arranged at a third metacarpal bone; one end of the radius side fixing prosthesis can be arranged at the radius, and the other end of the radius side fixing prosthesis is provided with a metal hinging seat connected with the metacarpal side fixing prosthesis; one end of the metacarpal bone side fixing prosthesis can be arranged at a third metacarpal bone, the other end of the metacarpal bone side fixing prosthesis is provided with a hinged ball head hinged with the hinged seat, and the hinged ball head is coated with a high-crosslinking high-molecular-weight polyethylene coating.
Specifically, a metal-pair high-crosslinking high-molecular-weight polyethylene interface is applied to a joint interface of the total wrist joint prosthesis, the friction coefficient between the metal-pair high-crosslinking high-molecular-weight polyethylene interface and the normal joint of a human body is close to the friction coefficient, the metal-pair high-crosslinking high-molecular-weight polyethylene interface is more resistant to impact, and adverse conditions such as local soft tissue reaction, neck corrosion fracture, metal ion release and the like caused by inflammatory pseudotumor of surrounding tissues, periprosthetic bone necrosis, potential metal ion toxicity and metal corrosion can be avoided, so that the safety and reliability of postoperative use are improved, and the adverse effect on the functions after the operation is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a total wrist prosthesis provided in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a metacarpal side fixed prosthesis and a hinged ball in the total wrist joint prosthesis according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a radial side fixing prosthesis and a hinge seat in the total wrist joint prosthesis according to an embodiment of the present invention.
Icon:
100-metacarpal side fixation prosthesis;
200-a radial side fixation prosthesis;
300-a hinged ball head; 310-ball neck snap joint;
400-hinged seat.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a total wrist joint prosthesis including a metacarpal side fixing prosthesis 100 for placement at a third metacarpal bone and a radial side fixing prosthesis 200 for placement at a radial bone; one end of the radial bone side fixing prosthesis 200 can be arranged at the radius, and the other end is provided with a metal hinging seat 400 connected with the metacarpal bone side fixing prosthesis 100; one end of the metacarpal side fixed prosthesis 100 can be arranged at the third metacarpal, the other end is provided with a hinged ball head 300 hinged with the hinged seat 400, and the hinged ball head 300 is coated with a high-crosslinking high-molecular-weight polyethylene coating.
Specifically, a metal-pair high-crosslinking high-molecular-weight polyethylene interface is applied to a joint interface of the total wrist joint prosthesis, the friction coefficient between the metal-pair high-crosslinking high-molecular-weight polyethylene interface and the normal joint of a human body is close to the friction coefficient, the metal-pair high-crosslinking high-molecular-weight polyethylene interface is more resistant to impact, and adverse conditions such as local soft tissue reaction, neck corrosion fracture, metal ion release and the like caused by inflammatory pseudotumor of surrounding tissues, periprosthetic bone necrosis, potential metal ion toxicity and metal corrosion can be avoided, so that the safety and reliability of postoperative use are improved, and the adverse effect on the functions after the operation is reduced.
During a wrist repair operation, medical staff will remove the lunate and scaphoid bones in the near half, and if an ulnar impact is suspected, the triquetrum will also be removed. Then after the CMC (first carpometacarpal) joint is wedge-shaped trimmed, a guide wire is passed through the skull and the third metacarpal under X-ray fluoroscopy, then a reamer which is in accordance with the model of the wrist joint prosthesis is used for making a hole which is passed through the skull and the centre of the metacarpal, is passed over the proximal epiphyseal line of the metacarpal and is passed over the isthmus of the metacarpal by means of the guide wire, then an awl is used for opening the radius at the ridge between the radius distal lunate and the scaphoid concave joint surface, the guide wire is inserted to the middle third level of the radius under X-ray fluoroscopy, and the reamer is used for making a hole groove according to the setting of the guide wire. Then, the radial bone side fixing prosthesis 200 and the metacarpal bone side fixing prosthesis 100 are jointed, and then the radial bone side fixing prosthesis 200 and the metacarpal bone side fixing prosthesis 100 are respectively placed in the hole grooves of the third metacarpal bone and the radius bone, so that the prostheses are fixed with the hole grooves, and the degree of motion of the wrist joint is adjusted to be suitable for motion.
It should be noted that, during the wrist repairing operation, the medical staff will place the full wrist prosthesis printed in 3D according to the anatomical features of the patient into the wrist and the metacarpal bone of the patient, so that the proximal end of the radial bone side fixing prosthesis 200 corresponds to the radius of the patient, and the distal end of the metacarpal bone side fixing prosthesis 100 corresponds to the carpal bone and the metacarpal bone of the patient.
It should be noted that the radial bone fixation prosthesis 200 and the metacarpal bone fixation prosthesis 100 may be designed and manufactured according to the wrist bone contour of the patient, so that the joint of the prosthesis is matched with the rotation center of the wrist joint, and the wrist height is maximally reserved, thereby facilitating the function of the hand.
Wherein, the proximal end of the metacarpal-side fixation prosthesis 100 refers to the end away from the articulated ball head 300, and the distal end refers to the end where the articulated ball head 300 is provided.
Wherein the proximal end of the radial fixation prosthesis 200 refers to the end where the hinge seat 400 is provided, and the distal end refers to the end away from the hinge seat 400.
Referring to fig. 1, 2 and 3, in an alternative embodiment of the present embodiment, radial fixation prosthesis 200 is snapped into engagement with both hinge plate 400.
Specifically, a clamping head is arranged on the radial side fixing prosthesis 200, and a clamping groove is formed in the hinge seat 400, so that the radial side fixing prosthesis 200 and the hinge seat 400 are connected and fixed together in a clamping connection mode.
Referring to fig. 1, 2 and 3, in an alternative to this embodiment, a radial fixation prosthesis 200 employs a 3D printed metal trabecular structure; the hinge base 400 is made of cobalt-chromium-molybdenum alloy.
Specifically, the radial side fixation prosthesis 200 adopts a 3D printed metal bone trabecular structure, and achieves strong biological fixation of the radial side fixation prosthesis 200 and the distal end of the radius by utilizing the excellent bone ingrowth characteristics.
Among them, the radial bone side fixing prosthesis 200 may be made of a titanium alloy material.
The hinge base 400 may be made of cobalt-chromium-molybdenum alloy.
It should be noted that the 3D printed metal trabecular bone structure of the radial fixation prosthesis 200 is beneficial for postoperative patient recovery.
Referring to fig. 1, 2 and 3, in an alternative to this embodiment, the metacarpal-side fixation prosthesis 100 is snapped on both of the articulating ball head 300.
Specifically, the ball neck joint 310 is disposed on the metacarpal side fixed prosthesis 100, and the joint groove is disposed on the articulated ball head 300, so that the metacarpal side fixed prosthesis 100 and the articulated ball head 300 are connected in a clamped manner.
Referring to fig. 1, 2 and 3, in an alternative of the present embodiment, a metacarpal side fixed prosthesis 100 is made of a titanium alloy material, and the outer wall of the metacarpal side fixed prosthesis 100 is frosted; the articulated ball head 300 is made of high cross-linked high molecular weight polyethylene.
Specifically, the metacarpal side fixing prosthesis 100 is made of a titanium alloy material, and the outer wall of the metacarpal side fixing prosthesis 100 is frosted so that the patient can recover after the operation.
The articulated ball head 300 is made of high-crosslinking high-molecular-weight polyethylene, and a contact interface of the full wrist joint prosthesis is formed by the high-crosslinking high-molecular-weight polyethylene of the articulated ball head 300 and the cobalt-chromium-molybdenum alloy of the articulated seat 400, so that the probability of postoperative adverse reactions can be reduced.
Referring to fig. 1, 2 and 3, in an alternative embodiment of the present embodiment, the radial fixation prosthesis 200 has a porosity between 40% and 80%.
Specifically, according to the constitution of different patients, medical staff can treat the patients by using the radial bone side fixing prosthesis 200 with the porosity of 40%; alternatively, medical personnel may treat the patient with the radial fixation prosthesis 200 having a porosity of 60%, depending on the physical condition of the patient; alternatively, medical personnel may treat the patient with the radial fixation prosthesis 200 having a porosity of 80%, depending on the patient's physical constitution.
It should be noted that the porosity of the radial fixation prosthesis 200 may be selected by those skilled in the art according to actual circumstances, and will not be described in detail herein.
Referring to fig. 1, 2 and 3, in an alternative embodiment of the present embodiment, the radial fixation prosthesis 200 has a pore size between 600 μm and 1000 μm.
Specifically, according to the constitution of different patients, medical staff can adopt the radial bone side fixing prosthesis 200 with the aperture of 600 μm to treat the patients; alternatively, medical personnel can treat patients with the radial bone side fixing prosthesis 200 with the aperture of 800 μm according to the constitution of different patients; alternatively, medical personnel may treat the patient with the radial prosthesis 200 having a 1000 μm pore size, depending on the patient's constitution.
It should be noted that, the aperture of the radial fixation prosthesis 200 may be selected by a person skilled in the art according to actual circumstances, and will not be described in detail herein.
Referring to fig. 1, 2 and 3, in an alternative embodiment of the present embodiment, the metacarpal-side fixed prosthesis 100 has a modulus of elasticity between 10-20 GPa.
Specifically, according to the constitution of different patients, medical staff can adopt the metacarpal bone side fixing prosthesis 100 with the elastic modulus of 10GPa to treat the patients; according to the constitution of different patients, medical staff can adopt the metacarpal bone side fixing prosthesis 100 with the elastic modulus of 14GPa to treat the patients; alternatively, medical personnel can treat patients with the metacarpal side fixing prosthesis 100 with the elastic modulus of 18GPa according to the constitution of different patients; alternatively, medical personnel may treat the patient with the metacarpal side fixation prosthesis 100 having an elastic modulus of 20GPa, depending on the patient's constitution.
It should be noted that the elastic modulus of the metacarpal side fixation prosthesis 100 can be selected by those skilled in the art according to actual conditions, and the details are not repeated herein.
Referring to fig. 1, 2 and 3, in an alternative embodiment of the present embodiment, the radial fixation prosthesis 200 has a modulus of elasticity between 0.5-3 GPa.
Specifically, according to the constitution of different patients, medical staff can adopt the radial bone side fixing prosthesis 200 with the elastic modulus of 0.5GPa to treat the patients; alternatively, medical personnel can treat patients with the radial bone side fixation prosthesis 200 having an elastic modulus of 1.5GPa, depending on the constitution of different patients; alternatively, medical personnel may treat the patient with the radial fixation prosthesis 200 having an elastic modulus of 3GPa, depending on the physical constitution of the patient.
It should be noted that the elastic modulus of the radial fixation prosthesis 200 can be selected by those skilled in the art according to the actual situation, and will not be described in detail herein.
Referring to fig. 1, 2 and 3, in an alternative to this embodiment, the angle of rotation of both the radial fixation prosthesis 200 and the metacarpal fixation prosthesis 100 is between 65-80 degrees.
Specifically, the ball neck snap joint 310 of the articulating ball head 300 of the metacarpal-side fixation prosthesis 100 has three lengths, and the lengths of the three lengths differ by 5mm at most. The longest ball neck joint 310 can provide the articulation joint of the articulation ball 300 and the articulation seat 400 with an omnidirectional degree of motion of 80 degrees, and the shortest ball neck joint 310 can provide the articulation joint of the articulation ball 300 and the articulation seat 400 with an omnidirectional degree of motion of 65 degrees.
It should be noted that, a person skilled in the art can select the length of the ball neck snap-in connector 310 according to actual requirements, and the detailed description is omitted here.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A total wrist prosthesis, comprising: a metacarpal side fixation prosthesis (100) for placement at a third metacarpal and a radial side fixation prosthesis (200) for placement at a radius;
one end of the radius side fixing prosthesis (200) can be arranged at the radius, and the other end is provided with a metal hinging seat (400) connected with the metacarpal side fixing prosthesis (100);
the one end of fixed false body (100) of metacarpal bone side can set up in third metacarpal bone department, the other end be provided with articulated bulb (300) of articulated seat (400), it has high cross-linking high molecular weight polyethylene coating to coat on articulated bulb (300).
2. The total wrist prosthesis according to claim 1, wherein the radial fixation prosthesis (200) is snapped in with both of the hinge seats (400).
3. The total wrist joint prosthesis according to claim 2, characterized in that the radial fixation prosthesis (200) is in the form of a 3D printed metal trabecular bone structure;
the hinge seat (400) is made of cobalt-chromium-molybdenum alloy.
4. The total wrist prosthesis according to claim 1, characterized in that the metacarpal-side fixation prosthesis (100) is snap-fitted with both the articulated ball head (300).
5. The total wrist joint prosthesis according to claim 4, characterized in that the metacarpal side fixing prosthesis (100) is made of titanium alloy material, and the outer wall of the metacarpal side fixing prosthesis (100) is frosted;
the articulated ball head (300) is made of high-crosslinking high-molecular-weight polyethylene.
6. The total wrist joint prosthesis according to any one of claims 1-5, characterized in that the porosity of the radial fixation prosthesis (200) is between 40% and 80%.
7. The total wrist prosthesis according to claim 6, characterized in that the aperture of the radial fixation prosthesis (200) is between 600 μm and 1000 μm.
8. The total wrist prosthesis according to claim 6, characterized in that the elastic modulus of the radial fixation prosthesis (200) is between 0.5-3 GPa.
9. Total wrist prosthesis according to any one of claims 1-5, characterized in that the metacarpal side fixation prosthesis (100) has a modulus of elasticity between 10-20 GPa.
10. The total wrist prosthesis according to any one of claims 1-5, characterized in that the rotation angle of both the metacarpal side fixation prosthesis (100) and the radial side fixation prosthesis (200) is between 65-80 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121184264.9U CN215839734U (en) | 2021-05-28 | 2021-05-28 | Total wrist joint prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121184264.9U CN215839734U (en) | 2021-05-28 | 2021-05-28 | Total wrist joint prosthesis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215839734U true CN215839734U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121184264.9U Active CN215839734U (en) | 2021-05-28 | 2021-05-28 | Total wrist joint prosthesis |
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| CN (1) | CN215839734U (en) |
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2021
- 2021-05-28 CN CN202121184264.9U patent/CN215839734U/en active Active
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Effective date of registration: 20230926 Address after: 101112 Beijing Tongzhou District Tongzhou Economic Development Zone South District Xin Xi two road 10. Patentee after: BEIJING CHUNLIZHENGDA MEDICAL INSTRUMENTS Co.,Ltd. Address before: No.31, Xinjiekou East Street, Xicheng District, Beijing Patentee before: BEIJING JISHUITAN Hospital |