Distal humerus prosthesis for small humerus head

Abstract

The invention discloses a distal humerus prosthesis for the small head of the humerus, and relates to the technical field of medical instruments. The distal humerus prosthesis for the capitulum humerus comprises a humerus main body group which is used for being fixed at the resection position of the capitulum humerus; one end of the humerus handle group is used for being inserted into a humerus marrow cavity, and the other end of the humerus handle group is detachably connected with the humerus main body; the humerus side plate is fixed to the side face of the humerus through the steel plate nails, and the humerus side plate is fixedly connected with the humerus handle through the steel plate nails. In order to enhance the fixing effect between the prosthesis and the humerus, a steel plate nail originally needing to be hit between the humerus side plate and the humerus is arranged on the humerus handle in the humerus marrow cavity in a penetrating mode, so that the fixing enhancing effect is achieved, in the operation, more damage cannot be caused to the bone of a patient, and the fixing effect is improved. When the distal humerus prosthesis is used, a user only needs to form a hole in the humerus handle before an operation, so that the time required by the operation is not prolonged, and the stability of fixation between the distal humerus prosthesis and the bone of a patient can be improved by the distal humerus prosthesis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a humeral distal prosthesis for the humeral head. BACKGROUND

[0002] The humeral head is an intra-articular protruding structure on the anterior-lateral lower end of the humerus, which belongs to the humeral lateral condyle and is a semispherical smooth nodule. The outer edge is connected with the humeral lateral condyle, and the lower front part is the articular surface. The humeral head and the radial head form the humeroradial joint, which participates in the flexion and extension of the elbow joint and the rotation of the forearm. When flexing, the front edge of the radial head is embedded in the radial fossa, and when straightening, it contacts the lower articular surface. The fracture of this structure is usually caused by the shear stress induced by falling in the extended and everted position of the elbow joint. The fracture is divided into three types: complete fracture, partial fracture and articular cartilage contusion. The treatment method is selected according to the degree of injury, including closed reduction, open reduction or bone block resection.

[0003] When comminuted fractures and osteosarcoma occur, bone block resection is required. After the bone block of the humeral head is resected, a prosthesis needs to be installed to restore the function of the elbow joint. Some prosthesis technologies for the humeral head already exist in the prior art, such as the utility model patent with publication number CN213030939U, which discloses a humeral head prosthesis comprising a prosthesis head, a prosthesis handle and a prosthesis fixing plate formed as one piece. The shape of the prosthesis head is similar to the anatomical structure of the humeral head. The prosthesis handle is used to insert into the medullary cavity on the lateral side of the distal humerus, and the prosthesis fixing plate matches the anatomical structure on the lateral side of the distal humerus. The humeral head prosthesis structure can replace the function of the humeral head and is suitable for humeral head fractures, especially solving the problem of ineffective fixation after comminuted fracture of the humeral head or degenerative disease of the humeral head. Through the setting of the prosthesis handle and the prosthesis fixing plate, the prosthesis head can be stably fixed, and the stability of the overall structure of the prosthesis in use is realized.

[0004] In order to further enhance the stability of the fixation between the prosthesis and the humerus, the existing prosthesis can only increase the number of fixation screws to further enhance the fixation effect. However, in the process of clinical treatment and surgery, increasing the number of fixation screws will cause more pain to the patient and even have adverse effects on the patient's bones. At the same time, it will increase the operation time and increase the risk of surgery. SUMMARY

[0005] In view of the defects in the prior art, the technical problem solved by the present application is how to improve the stability of the fixation between the humeral prosthesis and the patient's bones.

[0006] To achieve the above purpose, the humeral distal prosthesis for the humeral head provided by the present application comprises: a humeral body group for fixing to the resected humeral head; A humeral stem, one end of which is used to be inserted into the humeral medullary cavity, and the other end of the humeral stem is detachably connected with the humeral body; A humeral side plate is fixed to the side of the humerus by a steel plate nail, and the humeral side plate is fixedly connected with the humeral stem by the steel plate nail.

[0007] By adopting the above technical scheme, in order to realize the effect of strengthening the fixation between the prosthesis and the humerus, the steel plate nail originally needed to be punched on the humeral side plate and the humerus is arranged on the humeral stem inside the humeral medullary cavity, so as to strengthen the fixation effect, and in this operation, more damage to the patient's skeleton will not be caused, only a hole needs to be opened on the humeral stem before the operation, so the operation time will not be prolonged; in order to realize the fixation connection between the humeral side plate and the humeral stem by the steel plate nail, the humeral stem needs to be inserted into a deep position of the humeral medullary cavity, because the inner wall of the medullary cavity has an arc, the existing integrated humeral prosthesis cannot be inserted to the preset depth, therefore the humeral body and the humeral stem are designed to be detachably connected, the humeral stem is first inserted into the humeral medullary cavity to the preset depth by cooperating with the humeral holding instrument and the humeral stem, and then the humeral stem and the humeral body are assembled; therefore, the humeral distal end prosthesis can improve the stability of the fixation between the humeral prosthesis and the patient's skeleton.

[0008] In an embodiment, a clamping hole is formed in the humeral body, and an end of the humeral stem is provided with a clamping piece, which is clamped and connected with the clamping hole.

[0009] By adopting the above technical scheme, the humeral body and the humeral stem of different sizes can be installed, and the problem of installation failure caused by the inability of the connection to adapt can be avoided.

[0010] In an embodiment, the humeral body comprises a body block and a transition layer, which is arranged between the body block and the humeral head.

[0011] By adopting the above technical scheme, the humeral body can be completely attached to the resection site through the transition layer, and the gap between the prosthesis and the humerus can be avoided.

[0012] In an embodiment, an anti-rotation groove is formed in the transition layer near the top of the clamping hole, an anti-rotation piece is sleeved on the clamping piece, one side of the anti-rotation piece is fixedly connected with the end of the humeral stem, and the anti-rotation piece is clamped and connected with the anti-rotation groove.

[0013] By adopting the above technical scheme, the relative rotation between the humeral stem and the humeral body can be avoided, the prosthesis structure cannot work normally, and maintenance or even reoperation is required.

[0014] In an embodiment, a plurality of bone growth holes are formed in one side of the transition layer close to the humeral head.

[0015] By adopting the technical scheme, the transition layer can not only improve the fitting degree of the humeral body and the humerus, but also prevent relative rotation between the humeral stem and the humeral body.

[0016] In an embodiment, a mounting threaded hole is formed on the clamping piece, and the mounting threaded hole is used for detachable connection with the humeral holding instrument.

[0017] By adopting the technical scheme, the humeral stem can be implanted into the humeral medullary cavity through the humeral holding instrument.

[0018] In an embodiment, the humeral side plate comprises a humeral lateral plate and a humeral medial plate, the humeral lateral plate is fixed to the lateral side of the humerus through a steel plate nail, and the humeral medial plate is fixed to the medial side of the humerus through a steel plate nail.

[0019] By adopting the technical scheme, the stability of the fixation between the humeral side plate and the humerus is improved, and the humeral side plate is suitable for humeri of different sizes and thicknesses, and has high applicability.

[0020] In an embodiment, the humeral lateral plate and the humeral body are fixed to the humeral head resection site through a fixing nail, the fixing nail comprises a first screwing section, a prosthesis threaded section and a first bone threaded section, the prosthesis threaded section is located between the first screwing section and the first bone threaded section, the first screwing section is located outside the humeral lateral plate, the prosthesis threaded section is located inside the humeral lateral plate and the humeral body, and the first bone threaded section is located inside the humerus.

[0021] By adopting the technical scheme, the humeral lateral plate and the humeral body can be fixed to the humerus together through the fixing nail, and the pressurization of the humeral lateral plate on the humeral body can further improve the firmness of the fixation between the humeral body and the humerus; the segmented design of the fixing nail can make the connection between different threads and corresponding structures more stable, thereby improving the stability of the humeral distal end prosthesis.

[0022] In an embodiment, the steel plate nail comprises a second screwing section, a steel plate threaded section and a second bone threaded section, the steel plate threaded section is located between the second screwing section and the second bone threaded section, the second screwing section is located outside the humeral lateral plate or the humeral medial plate, the steel plate threaded section is located inside the humeral lateral plate or the humeral medial plate, and the second bone threaded section is located inside the humerus, the humeral medullary cavity and the humeral stem.

[0023] By adopting the technical scheme, the segmented design of the steel plate nail can make the connection between different threads and corresponding structures more stable, thereby further improving the stability of the humeral distal end prosthesis.

[0024] In summary, the present application has at least one of the following beneficial technical effects: 1. The application is a humeral distal end prosthesis for the humeral head, which is fixed to the humeral stem inside the humeral medullary cavity by a steel plate nail, thereby enhancing the fixation effect, and without causing more damage to the patient's bone, only a hole needs to be opened on the humeral stem before the operation, thus without prolonging the operation time; in order to realize the fixation of the humeral distal end prosthesis to the humeral stem by the steel plate nail, the humeral stem needs to be inserted into a deep position in the humeral medullary cavity, because the inner wall of the medullary cavity has a curvature, the existing integrated humeral prosthesis cannot be inserted to the preset depth, therefore the humeral body and the humeral stem are designed to be detachably connected, the humeral stem is inserted into the humeral medullary cavity to the preset depth by cooperating with the humeral holding instrument and the humeral stem, and then the humeral stem and the humeral body are assembled; therefore the humeral distal end prosthesis can improve the stability of the fixation between the humeral prosthesis and the patient's bone; 2. The specific structure design of the transition layer can not only improve the fit between the humeral body and the humerus, but also prevent relative rotation between the humeral stem and the humeral body, and at the same time, the bone ingrowth hole on the transition layer can promote the bone cells to grow into the bone ingrowth hole, so that the fixation between the humeral body and the humerus is more firm; 3. The fixation design between the humeral distal end prosthesis and the humeral stem inside the humeral medullary cavity can not only improve the stability and connection firmness of the humeral distal end prosthesis, but also further prevent relative rotation between the humeral stem and the humeral body, thereby avoiding secondary injury to the patient. DETAILED DESCRIPTION

[0025] Figure 1 The structure diagram of the humeral distal end prosthesis for the humeral head of the embodiment of the application is located inside the humerus; Figure 2 The side view of Figure 1 The structure diagram of the humeral body of the embodiment of the application; Figure 3 The structure diagram of the humeral stem of the embodiment of the application; Figure 4 The structure diagram of the humeral distal end prosthesis for the humeral head of the embodiment of the application; Figure 5 The structure diagram of the humeral distal end prosthesis for the humeral head of the embodiment of the application; Figure 6 The side view of Figure 5 The side view of

[0026] In the figure: 1-humerus body, 101-body block, 102-transition layer, 103-clamping hole, 104-anti-rotation groove, 2-humerus stem, 201-clamping piece, 202-anti-rotation piece, 3-humerus side plate, 301-humerus lateral plate, 302-humerus medial plate, 4-fixing nail, 401-first screw section, 402-prosthesis threaded section, 403-first bone threaded section, 5-steel plate nail, 501-second screw section, 502-steel plate threaded section, 503-second bone threaded section. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0028] The humeral distal end prosthesis for the humeral head in the embodiments of the present application, as shown in Figure 1 , Figure 2 The humeral distal end prosthesis for the humeral head comprises a humerus body 1 for fixing at the humeral head resection site; A humerus stem 2, one end of which is used for inserting into the humeral medullary cavity, and the other end of the humerus stem 2 is detachably connected with the humerus body 1; A humerus side plate 3 is fixed to the side surface of the humerus through a steel plate nail 5, and the humerus side plate 3 is fixedly connected with the humerus stem 2 through the steel plate nail 5.

[0029] It can be seen that, according to the CT image, the range to be resected on the humeral head is determined, and the humerus body 1 group and the humerus stem 2 group are made according to the resection range, and the sizes of the humerus bodies 1 in the humerus body 1 group are all different, and the minimum size is the same as the resection range value, and when the resection range covers the radial fossa, the thickness of the humerus body 1 needs to be designed accordingly to form the original radial fossa shape and size, so as to avoid the elbow joint from being unable to move normally; the size of the humerus stem 2 in the humerus stem 2 group needs to be designed according to the width of the humeral medullary cavity and the depth to be inserted, and because the resection range changes, the insertion starting position and the curvature of the humerus stem 2 will be adjusted, so the above factors need to be considered; Therefore, in the case of detecting lesions before surgery or needing to adjust the resection range, the appropriate humerus body 1 and humerus stem 2 can be selected as the prosthesis to be installed after resection, and the two are assembled through the detachable connection structure, so that multiple matching modes can be achieved, thereby improving the matching degree of the humeral prosthesis and the patient's bone; Meanwhile, in order to realize the effect of strengthening the fixation between the prosthesis and the humerus, the steel plate nail 5 originally needed to be punched on the humerus side plate 3 and the humerus is arranged on the humeral stem 2 inside the humeral cavity, so as to strengthen the fixation effect, and in this operation, the patient's skeleton will not be damaged more, only the hole needs to be opened on the humeral stem 2 before the operation, so the operation time will not be prolonged; in order to realize the fixation connection between the humerus side plate 3 and the humeral stem through the steel plate nail 5, the humeral stem 2 needs to be inserted into the deep position of the humeral cavity, because the inner wall of the cavity has an arc, the existing integrated humeral prosthesis cannot be inserted to the preset depth, therefore the humeral body 1 and the humeral stem 2 are designed to be detachably connected, first the humeral stem 2 is inserted into the humeral cavity to the preset depth by cooperating with the humeral holding instrument, and then the humeral stem 2 is assembled with the humeral body 1; therefore the humeral distal end prosthesis can improve the stability of the fixation between the humeral prosthesis and the patient's skeleton.

[0030] Preferably, as shown in Figure 3 , Figure 4 The humeral body 1 is provided with a clamping hole 103, and the end of the humeral stem 2 is provided with a clamping piece 201, which is clamped and connected with the clamping hole 103.

[0031] Specifically, the clamping hole 103 is arranged on the humeral body 1 at the position where the humeral body 1 needs to be connected with the humeral stem 2, and the depth of the clamping hole 103 can be designed according to requirements. The depth of the clamping hole 103 arranged on the humeral body 1 of different sizes is not the same. For example, the depth of the clamping hole 103 arranged on the humeral body 1 with a size of 1*1cm cannot exceed 1cm, but the depth of the clamping hole 103 arranged on the humeral body 1 with a size of 2*2cm can exceed 1cm. The clamping piece 201 is arranged at the tail end of the humeral stem 2 (the head end of which is inserted into the humeral cavity), and the length of the clamping piece 201 is preferably the same as the depth of the clamping hole 103, so that the humeral body 1 and the humeral stem 2 are attached. At the same time, the clamping piece 201 is clamped and connected with the clamping hole 103. The above design facilitates the installation of the humeral body 1 and the humeral stem 2 of different sizes, avoiding the problem of installation failure due to the inadaptability of the connection position.

[0032] It should be noted that when the size of the humeral stem 2 to be installed is unique, the depth of the clamping hole 103 needs to be the same regardless of the size of the humeral body 1, so that the clamping piece 201 of the humeral stem 2 can be clamped into the clamping hole 103, thereby realizing assembly.

[0033] Preferably, as shown in Figure 3 A specific structure of the humeral body 1 is provided. The humeral body 1 comprises a main body block 101 and a transition layer 102, and the transition layer 102 is arranged between the main body block 101 and the humeral head.

[0034] Specifically, the humeral body 1 is divided into a main body block 101 and a transition layer 102, the shape of the main body block 101 is made according to the shape of the bone block removed by the patient, and the transition layer 102 is arranged between the contact part of the main body block 101 and the humerus. In order to balance the strength of the prosthesis and promote bone bonding, the main body block 101 and the transition layer 102 can be made of different materials to balance the two effects.

[0035] Preferably, as shown in Figure 3 、 Figure 4 As shown, the transition layer 102 at the top of the clamping hole 103 is provided with an anti-rotation groove 104, the clamping piece 201 is sleeved with an anti-rotation piece 202, and one side of the anti-rotation piece 202 is fixedly connected with the end of the humeral stem 2. The anti-rotation piece 202 is clamped and connected with the anti-rotation groove 104.

[0036] Specifically, the anti-rotation groove 104 is located at the top of the clamping hole 103, and the opening of the anti-rotation groove 104 is larger than the opening of the clamping hole 103, so as to avoid that the anti-rotation groove 104 affects the insertion of the clamping piece 201 into the clamping hole 103. At the same time, when the clamping piece 201 is inserted into the clamping hole 103, the anti-rotation piece 202 sleeved on the clamping piece 201 will gradually approach the anti-rotation groove 104. According to the sleeving position of the anti-rotation piece 202 on the clamping piece 201, the anti-rotation piece 202 and the anti-rotation groove 104 are clamped at the same time when the clamping piece 201 is clamped with the clamping hole 103. Avoid relative rotation between the humeral stem 2 and the humeral body 1, which causes the prosthesis structure to work abnormally, so that maintenance is needed, or even reoperation is needed. The cross-sectional shape of the anti-rotation groove 104 can be polygonal.

[0037] Preferably, the side of the transition layer 102 close to the humeral head is provided with a plurality of bone growth holes.

[0038] Specifically, the transition layer 102 can be 3D printed into a microporous structure, the porosity of the bone growth holes on the transition layer 102 is 75%, and the average pore size is 700-800 microns. The transition layer 102 not only can improve the fit between the humeral body 1 and the humerus, but also can prevent relative rotation between the humeral stem 2 and the humeral body 1. At the same time, the bone growth holes on the transition layer 102 can promote the growth of bone cells into the inside of the bone growth holes, so that the humeral body 1 and the humerus are fixed more firmly.

[0039] Preferably, as shown in Figure 1 A specific structure of the humeral side plate 3 is provided: The humeral side plate 3 includes a humeral lateral plate 301 and a humeral medial plate 302. The humeral lateral plate 301 is used to be fixed to the lateral side of the humerus by a steel plate nail 5, and the humeral medial plate 302 is used to be fixed to the medial side of the humerus by the steel plate nail 5.

[0040] Specifically, the humeral side plate 3 is split into two structures, humeral lateral plate 301 and humeral medial plate 302, which form a semi-enclosed structure with the humerus and are fixed by the steel plate nail 5 to improve the stability of the humeral side plate 3 and the humerus, and can be suitable for humeri of different sizes and thicknesses, with high applicability.

[0041] Further, as shown in Figure 1 、 Figure 5 , the humeral lateral plate 301 and the humeral body 1 are fixed to the humeral head resection site by the fixing nail 4, which includes a first screwing section 401, a prosthesis threaded section 402, and a first bone threaded section 403. The prosthesis threaded section 402 is located between the first screwing section 401 and the first bone threaded section 403. The first screwing section 401 is located outside the humeral lateral plate 301. The prosthesis threaded section 402 is located inside the humeral lateral plate 301 and the humeral body 1. The first bone threaded section 403 is located inside the humerus.

[0042] Specifically, one or more fixing nails 4 are provided on the humeral lateral plate 301, the humeral body 1, and the humerus to fix the humeral lateral plate 301 and the humeral body 1 together on the humerus, and the pressurization of the humeral lateral plate 301 on the humeral body 1 can further improve the firmness of the humeral body 1 and the humerus. The segmented design of the fixing nail 4 can make the connection of different threads and corresponding structures more stable, thereby improving the stability of the humeral distal prosthesis. The first screwing section 401 can be designed according to the screwing tool to facilitate the fixing nail 4 to be screwed to a preset depth.

[0043] Preferably, as shown in Figure 1 、 Figure 5 , one end of the steel plate nail 5 penetrates the humeral stem 2.

[0044] Specifically, the humeral lateral plate 301 can be fixed to the humeral stem 2 by the steel plate nail 5, and the humeral medial plate 302 can be fixed to the humeral stem 2 by the steel plate nail 5. Since the humeral stem 2 is located inside the humeral medullary cavity, the stability of the humeral distal prosthesis is further improved. At the same time, it can further prevent relative rotation between the humeral stem 2 and the humeral body 1.

[0045] Further, as shown in Figure 1 、 Figure 5 、 Figure 6 , the steel plate nail 5 includes a second screwing section 501, a steel plate threaded section 502, and a second bone threaded section 503. The steel plate threaded section 502 is located between the second screwing section 501 and the second bone threaded section 503. The second screwing section 501 is located outside the humeral lateral plate 301 or the humeral medial plate 302. The steel plate threaded section 502 is located inside the humeral lateral plate 301 or the humeral medial plate 302. The second bone threaded section 503 is located inside the humerus, the humeral medullary cavity, and the humeral stem 2.

[0046] Specifically, the segmented design of the steel plate nail 5 can make different threads and corresponding structure connection more stable, thereby further improving the stability of the distal humerus prosthesis.

[0047] The method for using the distal humerus prosthesis for the humeral head in the embodiment of the application comprises the following steps: According to the preoperative detection data, the preset position of the humeral head is resected, and the humeral body 1 and the humeral stem 2 of the appropriate size are selected; The humeral stem 2 is implanted into the humeral medullary cavity, and in this process, the humeral medullary cavity needs to be expanded, and the humeral stem 2 is inserted into the humeral medullary cavity by cooperating the mounting screw hole of the humeral holding instrument with the humeral stem 2; The clamping piece 201 is inserted into the clamping hole 103, so that the clamping piece 201 and the clamping hole 103 are clamped and connected, and the anti-rotation piece 202 and the anti-rotation groove 104 are clamped and connected; The humeral lateral plate 301 is moved to the preset position of the humeral lateral plate, the humeral lateral plate 301, the humerus and the humeral stem 2 are fixed by the steel plate nail 5, and the humeral lateral plate 301, the humeral body 1 and the humerus are fixed by the fixing nail 4; The humeral medial plate 302 is moved to the preset position of the humeral medial plate, and the humeral medial plate 302, the humerus and the humeral stem 2 are fixed by the steel plate nail 5.

[0048] Therefore, according to the CT image, the range to be resected on the humeral head is determined, and the humeral body 1 group and the humeral stem 2 group are made according to the resection range, the sizes of the humeral bodies 1 in the humeral body 1 group are different, and the minimum size is the same as the resection range value, when the resection range covers the radial fossa, the thickness of the humeral body 1 needs to be designed accordingly to form the original shape and size of the radial fossa, so as to avoid the elbow joint from being unable to move normally, and the size of the humeral stem 2 in the humeral stem 2 group needs to be designed according to the width of the humeral medullary cavity and the depth to be inserted, because the insertion starting position and the curvature of the humeral stem 2 will be adjusted after the resection range is changed, so the above factors need to be considered; Therefore, in the case of detecting lesions before operation or needing to adjust the resection range, the appropriate humeral body 1 and humeral stem 2 can be selected as the prosthesis after resection and assembled through the detachable connection structure between the two, so that various matching modes can be achieved, thereby improving the matching degree of the humeral prosthesis and the patient's skeleton; Meanwhile, in order to realize the effect of strengthening the fixation between the prosthesis and the humerus, the steel plate nail 5 originally needed to be punched on the humerus side plate 3 and the humerus, and the humeral stem 2 inside the humeral cavity is arranged, so as to play the effect of strengthening the fixation, and in this operation, the patient's skeleton will not be damaged more, only need to open a hole on the humeral stem 2 before operation, so it will not prolong the time required for the operation; In order to realize the fixation connection between the humerus side plate 3 and the humeral stem through the steel plate nail 5, the humeral stem 2 needs to be inserted into the deep position of the humeral cavity, because the inner wall of the cavity has an arc, the existing integrated humeral prosthesis cannot be inserted into the preset depth, therefore the humeral stem 2 and the humeral body 1 are designed to be detachably connected, first the humeral stem 2 is inserted into the preset depth of the humeral cavity by cooperating with the humeral holding instrument, and then the humeral stem 2 and the humeral body 1 are assembled; Therefore, the humeral distal end prosthesis can improve the stability of the fixation between the humeral prosthesis and the patient's skeleton.

[0049] The above description is only a specific embodiment of the present application, so that those skilled in the art can understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A humeral distal prosthesis for the humeral head, characterized in that, It includes: The humeral body (1) is used for fixing the humeral head resection; The humeral stem (2) is used for inserting into the humeral medullary cavity, and the other end of the humeral stem (2) is detachably connected with the humeral body (1); The humeral side plate (3) is fixed to the side of the humerus by the steel plate nail (5), and the humeral side plate (3) is fixedly connected with the humeral stem (2) by the steel plate nail (5).

2. The distal humerus prosthesis for the humeral head of claim 1, wherein: The humeral body (1) is provided with a clamping hole (103), and the end of the humeral stem (2) is provided with a clamping piece (201), which is clamped and connected with the clamping hole (103).

3. The distal humerus prosthesis for the humeral head of claim 2, wherein: The humeral body (1) includes a body block (101) and a transition layer (102), and the transition layer (102) is arranged between the body block (101) and the humeral head.

4. The distal humerus prosthesis for the humeral head of claim 3, wherein: The transition layer (102) at the top of the clamping hole (103) is provided with an anti-rotation groove (104), and the clamping piece (201) is provided with an anti-rotation piece (202), one side of the anti-rotation piece (202) is fixedly connected with the end of the humeral stem (2), and the anti-rotation piece (202) is clamped and connected with the anti-rotation groove (104).

5. The distal humerus prosthesis for the humeral head of claim 3, wherein: The side of the transition layer (102) close to the humeral head is provided with a plurality of bone growth holes.

6. The distal humerus prosthesis for the humeral head of claim 2, wherein: The clamping piece (201) is provided with a mounting threaded hole, which is used for detachably connecting with the humeral holding instrument.

7. The distal humerus prosthesis for the humeral head of claim 1, wherein: The humeral side plate (3) includes a humeral lateral plate (301) and a humeral medial plate (302), the humeral lateral plate (301) is used for fixing to the lateral side of the humerus by the steel plate nail (5), and the humeral medial plate (302) is used for fixing to the medial side of the humerus by the steel plate nail (5).

8. The distal humerus prosthesis for the humeral head of claim 7, wherein: The humeral lateral plate (301) and the humeral body (1) are fixed to the humeral head resection by the fixing nail (4), the fixing nail (4) includes a first screwing section (401), a prosthesis threaded section (402) and a first bone threaded section (403), the prosthesis threaded section (402) is located between the first screwing section (401) and the first bone threaded section (403), the first screwing section (401) is located outside the humeral lateral plate (301), the prosthesis threaded section (402) is located inside the humeral lateral plate (301) and the humeral body (1), and the first bone threaded section (403) is located inside the humerus.

9. The distal humerus prosthesis for the humeral head of claim 1, wherein: The steel plate nail (5) includes a second screwing section (501), a steel plate threaded section (502) and a second bone threaded section (503), the steel plate threaded section (502) is located between the second screwing section (501) and the second bone threaded section (503), the second screwing section (501) is located outside the humeral lateral plate (301) or the humeral medial plate (302), the steel plate threaded section (502) is located inside the humeral lateral plate (301) or the humeral medial plate (302), and the second bone threaded section (503) is located inside the humerus, the humeral medullary cavity and the humeral stem (2).

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