Hand scaphoid bone prosthesis
By designing the limit column of the scaphoid prosthesis colinear with the distal central axis of the scaphoid prosthesis, the problem of scaphoid prosthesis and osteotomy is solved, and the stability of the inner angle of the scaphoid prosthesis and the structural stability after surgery is achieved.
Patent Information
- Application Number
- CN202322979864.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-03
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2033-11-03
AI Technical Summary
The micro movement between the existing scaphoid prosthesis and the scaphoid osteotomy is not conducive to maintaining the stability of the inner angle of the scaphoid, resulting in poor postoperative structural stability.
A scaphoid prosthesis was designed, including a scaphoid prosthesis body and a limit column. The central axis of the limit column was colinear with the distal central axis of the scaphoid bone, reducing the micro movement between the prosthesis and osteotomy.
By reducing the micro movement between the prosthesis of the scaphoid and the osteotomy of the scaphoid, the stability of the inner angle of the scaphoid can be effectively maintained and the natural physiological movement and structural stability can be promoted after surgery.
Smart Images
Figure CN222549421U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical instruments, in particular to a scaphoid prosthesis. Background Art
[0002] The scaphoid bone, also known as the wrist scaphoid bone, high bone or keel, is the longest and largest bone in the proximal row of carpal bones and is shaped like a boat. Most of the surface of the scaphoid bone is covered by articular cartilage and is adjacent to the capitate, lunate, trapezoid and trapezoid bones. Due to its structure, it has a poor blood supply and is prone to nonunion or avascular necrosis after injury, and may even cause scaphoid collapse and painful arthritis. The injured scaphoid bone is usually treated by replacing part of the necrotic scaphoid bone.
[0003] In the related art, the scaphoid prosthesis is fused with the scaphoid osteotomy, and a connecting column is generally provided on the scaphoid prosthesis, and a fusion hole that cooperates with the connecting column is provided on the scaphoid osteotomy. The location of the connecting column is generally determined based on experience, which easily causes micro-movement between the scaphoid prosthesis and the scaphoid osteotomy after surgery, which is not conducive to maintaining the internal angle of the scaphoid and has the problem of poor stability. Utility Model Content
[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the utility model proposes a scaphoid prosthesis. The scaphoid prosthesis has the function of reducing the micro-motion between the scaphoid prosthesis and the osteotomy of the scaphoid, which is conducive to maintaining the internal angle of the scaphoid.
[0005] The scaphoid prosthesis of the embodiment of the utility model comprises a scaphoid prosthesis body and a limiting column.
[0006] The scaphoid prosthesis body has a first mating plane, which can be fitted with the osteotomy surface of the scaphoid bone. The limiting column extends along a first direction, and one end of the limiting column is connected to the first mating plane. The limiting column is used to be plugged into the mating hole, and the central axis of the limiting column can be colinear with the distal central axis of the scaphoid bone.
[0007] The scaphoid prosthesis of the embodiment of the utility model can reduce the micro-motion between the scaphoid prosthesis and the osteotomy of the scaphoid bone by arranging the central axis of the limiting column and the distal central axis of the scaphoid bone in a colinear manner, which is conducive to maintaining the overall internal angle formed by the scaphoid prosthesis and the osteotomy of the scaphoid bone. Therefore, postoperative recovery is conducive to achieving the natural physiological movement and structural stability of the scaphoid bone.
[0008] Therefore, the scaphoid prosthesis of the embodiment of the utility model has the advantage of improving the stability of the structure after surgery.
[0009] In some embodiments, the proximal midline and the distal midline of the scaphoid bone have an intersection, the first mating plane is perpendicular to the distal midline, and the intersection is located on the first mating plane.
[0010] In some embodiments, the scaphoid prosthesis body is a titanium alloy prosthesis.
[0011] In some embodiments, the scaphoid prosthesis body and the limiting post are integrally formed.
[0012] In some embodiments, the scaphoid prosthesis body is a hollow shell, and a filling structure is disposed inside the hollow shell.
[0013] In some embodiments, a tendon channel penetrating the scaphoid prosthesis body is provided on the proximal radial side of the scaphoid prosthesis body, and the tendon channel is arranged parallel to the palmar surface of the scaphoid prosthesis body.
[0014] In some embodiments, the angle between the tendon channel and the distal mid-axis of the scaphoid bone is 92° to 98°.
[0015] In some embodiments, the pore size of the tendon channel is 2.5 mm to 3.0 mm.
[0016] In some embodiments, the end of the navicular prosthesis body proximal to the radius has a curved surface that fits the radius.
[0017] In some embodiments, the scaphoid prosthesis further includes a filling layer, the limiting column is gap-inserted into the matching hole, and the filling layer fills the gap formed by the limiting column and the matching hole.
[0018] In some embodiments, the limiting column has a diameter of 2.mm to 2.5mm, and the matching hole has a diameter of 2.5mm to 3.0mm. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a front view of the scaphoid prosthesis of the embodiment of the utility model.
[0020] Figure 2 It is a perspective view of the scaphoid prosthesis according to an embodiment of the utility model.
[0021] Figure 3 This is an assembly diagram of the scaphoid prosthesis and scaphoid osteotomy according to an embodiment of the utility model.
[0022] Figure 4 It is a front view of the scaphoid bone according to an embodiment of the utility model.
[0023] Figure 5 It is a front view of the scaphoid bone according to an embodiment of the utility model.
[0024] Figure 6 It is a front view of the cooperation between the scaphoid bone and tendon in an embodiment of the utility model.
[0025] Reference numerals:
[0026] Scaphoid prosthesis 1; limiting column 11; first matching plane 12; tendon channel 13; scaphoid prosthesis body 14;
[0027] Scaphoid osteotomy 2; proximal central axis 21; distal central axis 22; scaphoid osteotomy surface 23; matching hole 24; intersection 25;
[0028] Radius 3;
[0029] Tendon4. DETAILED DESCRIPTION
[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.
[0031] Reference below Figure 1-Figure 6 The scaphoid prosthesis 1 according to the embodiment of the utility model is described.
[0032] The scaphoid prosthesis 1 of the embodiment of the utility model comprises a scaphoid prosthesis body 14 and a limiting column 11 .
[0033] The scaphoid prosthesis body 14 has a first mating plane 12, which can fit with the osteotomy surface 23 of the scaphoid bone. The limiting column 11 extends along the first direction, and one end of the limiting column 11 is connected to the first mating plane 12. The limiting column 11 is used to be plugged into the mating hole 24, and the central axis of the limiting column 11 can be colinear with the distal central axis 22 of the scaphoid bone.
[0034] The scaphoid prosthesis 1 of the present invention can reduce the micro-movement between the scaphoid prosthesis 1 and the scaphoid osteotomy 2 by arranging the central axis of the limiting column 11 in a colinear manner with the distal central axis 22 of the scaphoid, which is conducive to maintaining the overall internal angle formed by the scaphoid prosthesis 1 and the scaphoid osteotomy 2. Therefore, postoperative recovery is conducive to achieving the natural physiological movement and structural stability of the scaphoid.
[0035] Therefore, the scaphoid prosthesis 1 of the embodiment of the utility model has the advantage of improving the stability of the structure after surgery.
[0036] like Figures 2 to 4 As shown, the proximal middle axis 21 and the distal middle axis 22 of the scaphoid bone have an intersection 25 , the first mating plane 12 is perpendicular to the distal middle axis 22 , and the intersection 25 is located on the first mating plane 12 .
[0037] The scaphoid prosthesis 1 of the present invention can further reduce micro-movement between the scaphoid prosthesis 1 and the scaphoid osteotomy 2 by arranging the intersection 25 of the proximal central axis 21 and the distal central axis 22 of the scaphoid on the first matching plane 12, thereby further improving the stability after surgery.
[0038] The scaphoid prosthesis body 14 is a titanium alloy prosthesis. The scaphoid prosthesis body 14 is made of titanium alloy material because titanium alloy has strong corrosion resistance and good compatibility with human cell tissues, and titanium alloy has high strength and low elastic modulus, which reduces the difference between the scaphoid prosthesis body 14 and the scaphoid osteotomy. Therefore, it has the advantages of high structural strength and good fusion effect.
[0039] The scaphoid prosthesis body 14 and the limiting column 11 are integrally formed. The scaphoid prosthesis 1 of the present invention not only has good structural integrity, but also further improves the stability of the structure.
[0040] The scaphoid prosthesis body 14 is a hollow shell, and a filling structure is arranged inside the scaphoid prosthesis.
[0041] The hollow shell provided in the scaphoid prosthesis 1 of the embodiment of the utility model can not only reduce the weight, but also improve the strength of the hollow shell. A filling structure is provided inside the scaphoid prosthesis body 14 to support the hollow shell. The function of the filling structure is not only to support the hollow shell. Since the interior of the filling structure is full of gaps, it is convenient for healthy residual bones to grow into the interior of the filling structure, further strengthening the connection between the scaphoid prosthesis body 14 and the scaphoid osteotomy. As a result, the stability of the structure is further improved.
[0042] A tendon channel 13 penetrating the scaphoid prosthesis body 14 is provided on the side of the scaphoid prosthesis body 14 close to the radius 3 . The tendon channel 13 is arranged parallel to the palm surface of the scaphoid prosthesis body 14 .
[0043] Because the scaphoid bone and the lunate bone are connected by ligaments, in order to restore the natural movement of the scaphoid bone, a tendon channel 13 is drilled at one end of the lunate bone near the scaphoid bone, and the tendon 4 or ligament passes through the lunate bone hole and the tendon channel 13, and finally the two ends of the tendon 4 or ligament are fixed to the lunate bone with anchors or other means.
[0044] The scaphoid prosthesis 1 of the utility model embodiment can well maintain the stability of the wrist joint structure through the tendon channel 13. The connection between the scaphoid prosthesis 1 and the scaphoid osteotomy is stable and not easy to fall off, which can prevent the settlement of the scaphoid bone and is beneficial to reduce the patient's joint pain after surgery and improve the flexibility of joint movement.
[0045] The pore size of the tendon channel 13 is 2.5 mm to 3.0 mm. The pore size of the tendon channel 13 is 2.5 mm to 3.0 mm.
[0046] Optionally, the aperture of the tendon channel 13 is 2.7 mm. Specifically, according to different body shapes of patients, medical personnel can select tendon channels 13 with different apertures.
[0047] The angle between the tendon channel 13 and the distal center axis 22 of the scaphoid bone is 92° to 98°.
[0048] The scaphoid prosthesis 1 of the embodiment of the utility model has an angle of 92° to 98° relative to the distal central axis 22 of the scaphoid through the tendon channel 13. After the operation is completed, it is beneficial for the tendon 4 to tighten the bone anchor, which can reduce the displacement of the tendon 4 during hand activities, rebuild the stability of the carpometacarpal joint, and reduce the wear on the tendon 4.
[0049] One end of the navicular prosthesis body 14 near the radius 3 has an arcuate surface that fits with the radius 3 .
[0050] The hand scaphoid prosthesis 1 of the utility model embodiment has an arcuate surface that fits with the radius 3 at one end of the scaphoid prosthesis body 14 near the radius 3, which can well match the size and curved surface of the basal articular surface of the patient's radius 3, thereby well preserving the stability of the wrist joint structure and preventing the radius 3 from settling, thereby helping to relieve joint pain and increase joint activity.
[0051] The scaphoid prosthesis 1 of the embodiment of the utility model further includes a filling layer. The limiting column 11 is inserted into the matching hole 24 with a gap, and the filling layer is filled in the gap formed by the limiting column 11 and the matching hole 24 .
[0052] The scaphoid prosthesis 1 of the embodiment of the utility model is inserted into the matching hole 24 through the gap of the limiting column 11, and the filling layer is filled in the gap formed by the limiting column 11 and the matching hole 24, which is beneficial to improving the stability of the connection between the scaphoid prosthesis 1 and the scaphoid osteotomy 2, and is beneficial to reducing the recovery time after surgery.
[0053] The diameter of the limiting column 11 is 2.0 mm to 2.5 mm, and the diameter of the matching hole 24 is 2.5 mm to 3.0 mm. Therefore, the structure has the advantage of good stability.
[0054] Further, the diameter of the limiting column 11 is 2.0 mm, and the diameter of the matching hole 24 is 2.5 mm. The diameter of the limiting column 11 is 2.2 mm, and the diameter of the matching hole 24 is 2.6 mm. The diameter of the limiting column 11 is 2.5 mm, and the diameter of the matching hole 24 is 3.0 mm.
[0055] The surgical operation steps are as follows: S1. Determine the three-dimensional model of the scaphoid prosthesis based on the mirror image of the patient's healthy wrist CT image; S2. Determine the position of the osteotomy surface 23 of the scaphoid bone according to the patient's specific situation; S3. Intercept the three-dimensional model of the scaphoid bone according to the osteotomy line, obtain the three-dimensional model of the scaphoid prosthesis 1, and print the scaphoid prosthesis 1 using 3D printing technology. S4. Take a palmar or dorsal approach, incise the skin, subcutaneous tissue and joint capsule, separate the branches of the nerves, expose the scaphoid bone, cut off the necrotic part, and trim the osteotomy surface. S5. Inject bone cement into the matching hole 24, insert the limiting column 11 of the scaphoid prosthesis 1 into the matching hole 24, wait for the bone cement to harden, and insert the tendon 4 into the tendon channel 13, tighten it, and use bone anchors or other methods to fix the two ends of the tendon 4 to the lunate. S6. Flush the joint cavity, suture the joint capsule, subcutaneous tissue and skin.
[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0059] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0060] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A scaphoid prosthesis, characterized in that: include: A scaphoid prosthesis body, wherein the scaphoid prosthesis body has a first matching plane, and the first matching plane can fit with the osteotomy surface of the scaphoid bone; and A limiting column, wherein the limiting column extends along a first direction, and one end of the limiting column is connected to the first matching plane, the limiting column is used to be plugged into the matching hole, and the central axis of the limiting column can be colinear with the distal central axis of the scaphoid bone.
2. The scaphoid prosthesis according to claim 1, characterized in that: The proximal middle axis and the distal middle axis of the scaphoid bone have an intersection, the first matching plane is perpendicular to the distal middle axis, and the intersection is located on the first matching plane.
3. The scaphoid prosthesis according to claim 1, characterized in that: The scaphoid prosthesis body is a titanium alloy prosthesis; and / or the scaphoid prosthesis body and the limiting column are integrally formed.
4. The scaphoid prosthesis according to claim 3, characterized in that: The scaphoid prosthesis body is a hollow shell, and a filling structure is arranged inside the hollow shell.
5. The scaphoid prosthesis according to claim 1, characterized in that: A tendon channel penetrating the scaphoid prosthesis body is provided on the proximal radial side of the scaphoid prosthesis body, and the tendon channel is arranged parallel to the palmar surface of the scaphoid prosthesis body.
6. The scaphoid prosthesis according to claim 5, characterized in that: The angle between the tendon channel and the distal midline of the scaphoid bone is 92° to 98°.
7. The scaphoid prosthesis according to claim 5, characterized in that: The pore size of the tendon channel is 2.5 mm to 3.0 mm.
8. The scaphoid prosthesis according to claim 1, characterized in that: One end of the navicular prosthesis body near the radius has an arcuate surface that fits the radius.
9. The scaphoid prosthesis according to claim 1, characterized in that: It also includes a filling layer, the limiting column gap is inserted into the matching hole, and the filling layer is filled in the gap formed by the limiting column and the matching hole.
10. The scaphoid prosthesis according to claim 9, characterized in that: The limiting column has a diameter of 2.mm to 2.5mm, and the matching hole has a diameter of 2.5mm to 3.0mm.