A segmental long bone prosthesis

Abstract

The present application relates to a long bone prosthesis, in particular to a segmental long bone prosthesis, the technical solution of which is as follows: it comprises a proximal handle and a medullary needle segment, a main body of a backbone segment is arranged between the proximal handle and the medullary needle segment, one end of the medullary needle segment is inserted into one end of the main body of the backbone segment, a retaining groove is provided on the peripheral surface of the medullary needle segment, a retaining hole is provided on the main body of the backbone segment, a retaining bead embedded in the retaining groove is provided inside the retaining hole; a sliding sleeve is provided on the outside of the main body of the backbone segment, and the retaining bead is pressed between the inner wall of the sliding sleeve and the bottom of the retaining groove; at the same time, a positioning pin is provided through the sliding sleeve and the main body of the backbone segment; the purpose of facilitating the installation of the segmental long bone prosthesis to save operation time and improve the stability and reliability of the prosthesis structure is achieved.

Description

Technical Field

[0001] The present application relates to a long bone prosthesis, and more particularly to a segmental long bone prosthesis. Background Art

[0002] In recent years, malignant bone tumors in the diaphysis of long bones in the human body have seriously affected the quality of life of patients. Limb salvage surgery has become the main treatment method for malignant bone tumors in the diaphysis of long bones in the human body. In limb salvage reconstruction surgery, a segmental prosthesis is commonly used to replace the resected tumor bone segment, that is, both ends of the prosthesis are respectively inserted into the proximal medullary cavity and the distal medullary cavity.

[0003] A segmental prosthesis described in the related art includes a proximal stem and a medullary needle segment that are fixedly connected to each other by a plurality of screws, which makes the installation process of the segmental prosthesis relatively cumbersome and takes up surgical time, and the screws are likely to loosen after many years, resulting in the failure of the prosthesis. Summary of the Invention

[0004] In order to facilitate the installation of the segmental long bone prosthesis to save surgical time and improve the stability and reliability of the prosthesis structure, the present application provides a segmental long bone prosthesis.

[0005] The segmental long bone prosthesis provided by the present application adopts the following technical solutions:

[0006] A segmental long bone prosthesis includes a proximal stem and a medullary needle segment. A main body of the diaphysis is provided between the proximal stem and the medullary needle segment. One end of the medullary needle segment is inserted into one end of the main body of the diaphysis. A clamping groove is formed on the circumferential surface of the medullary needle segment, and a clamping hole is formed on the main body of the diaphysis. A clamping bead that is embedded in the clamping groove is arranged inside the clamping hole; a sliding sleeve is sleeved outside the main body of the diaphysis, and the clamping bead is pressed between the inner wall of the sliding sleeve and the bottom of the clamping groove; at the same time, a positioning pin penetrates through the sliding sleeve and the main body of the diaphysis.

[0007] By adopting the above technical solutions, when assembling the long bone prosthesis, the medullary needle segment is inserted into the main body of the diaphysis until the clamping bead is embedded in the clamping groove, and the sliding sleeve is slid so that the inner wall of the sliding sleeve abuts against the clamping bead. The clamping bead is then pressed inside the clamping groove and cannot radially escape from the clamping groove along the medullary needle segment. The clamping bead then connects the medullary needle segment and the main body of the diaphysis together, realizing the assembly of the long bone prosthesis. The setting of the positioning pin effectively prevents the sliding sleeve from moving downward or being displaced relative to the main body of the diaphysis after the operation, thereby preventing the situation where the sliding sleeve loses the pressing effect on the clamping bead; compared with the connection of each segment by a plurality of screws in the related art, the present application only needs to insert the medullary needle segment and slide the sliding sleeve and other steps to achieve blocking and fixation, which is convenient for the installation of the segmental long bone prosthesis to save surgical time and improve the stability and reliability of the prosthesis structure.

[0008] Optionally, a sliding hole for the positioning pin to pass through is provided on the circumferential surface of the backbone segment body. The length direction of the sliding hole extends along the axial direction of the backbone segment body, and a pin receiving groove communicating with the sliding hole is provided inside the backbone segment body. A spring located inside the pin receiving groove is arranged on the side of the positioning pin away from the marrow needle segment. The spring is compressed between the positioning pin and the bottom of the pin receiving groove; a relief groove for the positioning bead to enter and completely escape from the positioning groove is provided at one end of the inner hole of the sliding sleeve close to the marrow needle segment.

[0009] By adopting the above technical solution, the sliding sleeve is pushed so that the positioning pin slides inside the sliding hole accordingly and further compresses the spring until the relief groove slides to the position where the positioning hole is located; one end of the marrow needle segment is inserted into the backbone segment body until the positioning groove moves to the position where the positioning bead is located and the positioning bead enters the positioning groove along the radial direction of the backbone segment body. Then the sliding sleeve is released so that the positioning pin spontaneously moves in the direction close to the end of the marrow needle segment under the action of the spring, and the positioning bead is further tightly pressed inside the positioning groove at all times.

[0010] Optionally, the cross-sectional contour shape of the positioning groove along the axial direction of the marrow needle segment is an arc with a radius of curvature equal to the radius of the positioning bead, and the positioning groove is an annular groove coaxial with the marrow needle segment.

[0011] By adopting the above technical solution, the positioning bead can be more stably embedded inside the positioning groove and closely fit with the bottom of the positioning groove, preventing axial shaking between the backbone segment body and the marrow needle segment due to the shaking of the positioning bead inside the positioning groove; the setting that the positioning groove is an annular groove enables the positioning bead to be pressed at any position in the circumferential direction of the marrow needle segment without rotating the marrow needle segment to find the position of the positioning groove during the process of inserting the marrow needle segment into the backbone segment body so that the positioning groove falls into the positioning groove, which further facilitates the assembly of the joint prosthesis.

[0012] Optionally, a backbone extension segment is provided between the proximal handle and the backbone segment body. A proximal positioning post inserted into the backbone extension segment is provided at one end of the proximal handle close to the backbone extension segment, and an extension positioning post inserted into the backbone segment body is provided at one end of the backbone extension segment close to the backbone segment body.

[0013] By adopting the above technical solution, the length of the backbone extension segment can be customized according to the needs of the patient or prefabricated in multiple models for the patient to choose. When a revision surgery needs to be performed according to the patient's condition many years after the operation, only the backbone extension segment needs to be replaced. Compared with replacing the marrow needle segment or the proximal handle in the related art, the present application greatly saves the prosthesis material cost and the time for reassembly.

[0014] Optionally, the diameter of the proximal positioning post gradually decreases along the direction from close to away from the proximal handle, and the taper of the proximal positioning post is 1.5 - 3.0°.

[0015] By adopting the above technical solution, a taper fit between the proximal stem and the extended bone segment is achieved, thereby making the installation fit between the proximal stem and the extended bone segment safer and more reliable after surgery.

[0016] Optionally, the diameter of the extended positioning post gradually decreases along the direction from close to away from the extended bone segment, and the taper of the extended positioning post is 1.5 - 3.0°.

[0017] By adopting the above technical solution, a taper fit between the extended bone segment and the main body of the bone segment is achieved, thereby making the installation fit between the extended bone segment and the main body of the bone segment safer and more reliable after surgery.

[0018] Optionally, a marrow needle is provided at one end of the marrow needle segment away from the main body of the bone segment, and a plurality of thimble needles are formed on the circumferential surface of the marrow needle. The thimble needles are inclined away from the marrow needle segment along the radial direction of the marrow needle.

[0019] By adopting the above technical solution, the cancellous bone has an effective supporting effect on the needle and nail, thereby making it difficult for the marrow needle segment to sink inside the medullary cavity to improve the stability and reliability of the prosthesis installation.

[0020] Optionally, the surface of the marrow needle is provided with one or more of an HA coating, a Ti coating, a sintered coating, a tantalum coating, a 3D printed porous Ti coating, and a 3D printed porous tantalum coating.

[0021] By adopting the above technical solution, the surface of the marrow needle has a better bone ingrowth effect, thereby promoting the establishment of an effective and reliable fixed support relationship between the marrow needle and the cancellous bone.

[0022] Optionally, a plurality of interconnected annular grooves are formed on the circumferential surface of the proximal stem, and the diameters of the plurality of annular grooves gradually decrease along the direction from close to away from the main body of the bone segment.

[0023] By adopting the above technical solution, the proximal stem can better fit with the cancellous bone, thereby reducing the possibility of the long bone prosthesis sinking.

[0024] Optionally, at least one connecting plate is fixed on the proximal stem or the marrow needle segment.

[0025] By adopting the above technical solution, the proximal stem or the marrow needle segment is bolted to the proximal cortical bone or the distal cortical bone through the connecting plate, so that the positional relationship between the long bone prosthesis and the long bone is more stable and reliable after surgery.

[0026] In summary, the present application has the following technical effects:

[0027] 1. By providing a sliding sleeve, a positioning bead, a sliding sleeve and a positioning pin, and opening a positioning groove and a positioning hole, compared with the related art that uses multiple screws to connect each group segment, the present application only needs to insert a medullary needle segment and slide the sliding sleeve to achieve blocking and fixing, which is convenient for the installation of segmental long bone prosthesis to save surgical time and improve the stability and reliability of the prosthesis structure;

[0028] 2. By setting a spring, opening a sliding hole and a clearance groove, the medullary needle segment and the main body of the diaphyseal segment can be installed or removed by sliding the sliding sleeve, which further facilitates the assembly of the diaphyseal prosthesis;

[0029] 3. By setting up a backbone extension segment, the length can be customized according to the patient's needs or prefabricated in various models for the patient to choose. When revision surgery is needed many years after the operation according to the patient's condition, only the backbone extension segment needs to be replaced. Compared with the replacement of the medullary needle segment or the proximal handle in the related technology, this application greatly saves the cost of prosthetic materials and the time for reassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of the segmental long bone prosthesis in the embodiment of the present application, in which the connecting plate is not shown;

[0031] Figure 2 It is a schematic diagram of the exploded structure of the installation between the proximal handle, the extended shaft section and the main body of the shaft section in the embodiment of the present application;

[0032] Figure 3 is a schematic structural diagram of the sliding sleeve in an embodiment of the present application;

[0033] Figure 4 It is a schematic structural diagram of the medullary needle segment and the connecting plate in an embodiment of the present application;

[0034] Figure 5 It is a schematic diagram of the structure of the proximal handle and the connecting plate in an embodiment of the present application.

[0035] In the figure, 1, proximal handle; 11, proximal positioning column; 12, annular groove; 2, medullary needle section; 21, positioning groove; 22, medullary needle; 23, ejector pin; 3, main body of the shaft section; 31, positioning hole; 32, sliding hole; 33, pin receiving groove; 4, positioning bead; 5, sliding sleeve; 51, clearance groove; 6, positioning pin; 7, spring; 8, shaft extension section; 81, extended positioning column; 9, connecting plate. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings.

[0037] Reference Figure 1The present application provides a segmental long bone prosthesis, comprising a proximal handle 1 and a main body 3 of a backbone segment connected to each other, a medullary needle segment 2 is arranged at one end of the main body 3 away from the proximal handle 1, and the proximal handle 1, the main body 3 of the backbone segment and the medullary needle segment 2 are coaxially arranged; a medullary needle 22 for inserting into the distal medullary cavity is arranged at one end of the medullary needle segment 2 away from the main body 3 of the backbone segment, and a backbone extension segment 8 is coaxially arranged between the proximal handle 1 and the main body 3 of the backbone segment; in this embodiment, the diameters of the proximal handle 1 and the medullary needle segment 2 are both 8-20 mm, and the lengths of the two can be customized according to the patient's physical condition, and the length of the backbone extension segment 8 is 30-200 mm.

[0038] The specific length of the backbone extension segment 8 can be determined according to the needs of the patient or prefabricated in advance into a variety of models for the patient to choose. When a revision surgery is needed many years after the operation according to the patient's condition, only the backbone extension segment 8 needs to be replaced. Compared with the replacement of the medullary needle segment 2 or the proximal handle 1 in the related technology, the present application greatly saves the cost of prosthetic materials and the time for reassembly.

[0039] Reference Figure 1 and Figure 2 The connection between the proximal handle 1 and the shaft extension section 8 is specifically configured as follows: a proximal positioning column 11 with a taper is coaxially formed at one end of the proximal handle 1 close to the shaft extension section 8, and the diameter of the proximal positioning column 11 gradually decreases along the direction from approaching to away from the proximal handle 1, and the taper of the proximal positioning column 11 is 1.5-3.0°; a blind hole matched with the proximal positioning column 11 is opened at one end of the shaft extension section 8 close to the proximal handle 1, the proximal positioning column 11 is inserted into the interior of the shaft extension section 8 and is pressed tightly against the interior of the shaft extension section 8 by the pressure of human tissue, thereby forming an effective taper fit between the shaft extension section 8 and the proximal handle 1; in this embodiment, the taper of the proximal positioning column 11 is selected to be 2-2.86° to maximize the reliability and safety of the taper fit.

[0040] Similarly, refer to Figure 1 and Figure 2 An extension positioning column 81 with a taper is coaxially formed at one end of the shaft extension section 8 close to the shaft section main body 3, and the diameter of the extension positioning column 81 gradually decreases along the direction from approaching to away from the shaft extension section 8, and the taper of the extension positioning column 81 is 1.5-3.0°; a blind hole compatible with the extension positioning column 81 is opened at one end of the shaft section main body 3 close to the shaft extension section 8, and the extension positioning column 81 is inserted into the shaft section main body 3 and pressed into the shaft section main body 3 by the pressure of human tissue, thereby forming an effective taper fit between the shaft extension section 8 and the shaft section main body 3, and indirectly fixing the proximal handle 1 to the shaft section main body 3; in this embodiment, the taper of the extension column is selected to be 2-2.86° to maximize the reliability and safety of the taper fit.

[0041] Further, see Figure 1 In one embodiment, the fixing method between the main body 3 of the diaphragm and the medullary needle segment 2 is specifically configured as follows: an end surface hole for inserting one end of the medullary needle segment 2 is provided on one end of the main body 3 of the diaphragm close to the medullary needle segment 2, and the end of the medullary needle segment 2 close to the proximal handle 1 is coaxially inserted into the interior of the main body 3 of the diaphragm; and then combined with Figure 2 The main body 3 of the backbone section is provided with a locking hole 31 extending in its radial direction. The locking hole 31 is a cylindrical hole and communicates with the end hole on the main body 3 of the backbone section. A locking bead 4 with a diameter equal to that of the locking hole 31 is placed inside the locking hole 31. The peripheral surface of the medullary needle section 2 is provided with a locking groove 21 for the locking bead 4 to be embedded; the main body 3 of the backbone section is sleeved with a sliding sleeve 5 adapted to the main body 3 of the backbone section, and the inner wall of the sliding sleeve 5 presses the locking bead 4 against the bottom of the locking groove 21, that is, prevents the locking bead 4 from escaping from the inside of the locking groove 21; in order to prevent the sliding sleeve 5 from being inserted into the surgical operation, the locking bead 4 is prevented from being inserted into the surgical operation. After that, it moves downward or misaligned relative to the main body 3 of the backbone segment, thereby causing the sliding sleeve 5 to lose the pressing effect on the locking bead 4. A positioning pin 6 is provided radially through the sliding sleeve 5, and the positioning pin 6 also radially penetrates the main body 3 of the backbone segment; in this embodiment, two locking holes 31 are provided and are relatively provided on both sides of the main body 3 of the backbone segment, and two locking beads 4 are also correspondingly provided; further, the cross-sectional profile shape of the locking groove 21 along the axial direction of the medullary needle segment 2 is an arc with a curvature radius equal to the radius of the locking bead 4, and the locking groove 21 is an annular groove coaxial with the medullary needle segment 2.

[0042] When it is necessary to assemble the long bone prosthesis, the medullary needle segment 2 is inserted into the inside of the main body 3 of the backbone segment until the positioning bead 4 is embedded in the positioning groove 21, and the sliding sleeve 5 is slid so that the inner wall of the sliding sleeve 5 is pressed against the positioning bead 4, and the positioning bead 4 is then pressed into the positioning groove 21 and cannot be radially disengaged from the positioning groove 21. The positioning bead 4 then connects the medullary needle segment 2 with the main body 3 of the backbone segment, and finally the positioning pin 6 is knocked into the sliding sleeve 5 and the inside of the main body 3 of the backbone segment, so that the long bone prosthesis is reliably assembled; due to the positioning groove 21 The bottom of the groove is arc-shaped, so that the locking bead 4 can fit more closely with the bottom of the locking groove 21, preventing axial shaking between the backbone segment body 3 and the medullary needle segment 2 caused by the shaking of the locking bead 4 inside the locking groove 21. In addition, since the locking groove 21 is an annular groove, when a single or multiple locking beads 4 enter the locking groove 21, there is no need to rotate the medullary needle segment 2 to allow the locking bead 4 to find the position of the locking groove 21, that is, the locking bead 4 can be pressed at any circumferential position of the medullary needle segment 2, further facilitating the assembly of the joint prosthesis.

[0043] Reference Figure 1 and Figure 3, in another embodiment provided on the basis of the above embodiment, it is further configured that: a sliding hole 32 penetrating both sides of itself is formed on the circumferential surface of the backbone segment main body 3, and the positioning pin 6 can pass through the sliding hole 32. The sliding hole 32 is a kidney-shaped hole and the length direction of the sliding hole 32 extends along the axial direction of the backbone segment main body 3, and the positioning pin 6 can then move along the axial direction of the backbone segment main body 3 and its own radial direction inside the sliding hole 32; a pin receiving groove 33 is formed inside the backbone segment main body 3, and the pin receiving groove 33 is communicated with the end face hole of the backbone segment main body 3 and the sliding hole 32 at the same time; a spring 7 in a compressed state is arranged inside the pin receiving groove 33 on the side of the positioning pin 6 away from the marrow needle segment 2, one end of the spring 7 abuts against the bottom of the pin receiving groove 33 and the other end abuts against the circumferential surface of the positioning pin 6; a relief groove 51 is coaxially formed at one end of the sliding sleeve 5 close to the marrow needle segment 2, and the diameter of the relief groove 51 is larger than the diameter of the backbone segment main body 3, so that the clamping bead 4 can enter the relief groove 51 and completely break away from the clamping groove 21.

[0044] Before assembling the long bone prosthesis, the backbone segment main body 3 and the sliding sleeve 5 can be pre-assembled into a whole through the positioning pin 6. When it is necessary to fix the marrow needle segment 2 on the backbone segment main body 3, the sliding sleeve 5 is slid towards the end away from the end where the marrow needle segment 2 is to be inserted, and the positioning pin 6 slides inside the sliding hole 32 accordingly and further compresses the spring 7 until the relief groove 51 slides to the position where the clamping hole 31 is located; then one end of the marrow needle segment 2 is inserted into the backbone segment main body 3. Since the clamping hole 31 is communicated with the relief groove 51 at this time, the circumferential surface of the marrow needle segment 2 then pushes the clamping bead 4 and makes the clamping bead 4 move radially towards the direction close to the relief groove 51 until the clamping groove 21 moves to the position where the clamping bead 4 is located and the clamping bead 4 enters the clamping groove 21 along the radial direction of the backbone segment main body 3. The sliding sleeve 5 is released to make the positioning pin 6 move spontaneously towards the direction close to the end of the marrow needle segment 2 under the action of the spring 7 until the relief groove 51 moves to a position where it is disengaged from the clamping hole 31, and the clamping bead 4 is then always pressed tightly inside the clamping groove 21.

[0045] Compared with the connection of each segment through multiple screws in the related art, the present application only needs to insert the marrow needle segment 2 and slide the sliding sleeve 5 and other steps to achieve blocking and fixation, which is convenient for the installation of the segmental long bone prosthesis to save the operation time and improve the stability and reliability of the prosthesis structure.

[0046] In addition, referring to Figure 1 and Figure 4The end of the medullary needle segment 2 away from the main body 3 of the diaphysis segment is coaxially formed with a medullary needle 22 for inserting into the distal medullary cavity, and a plurality of triangular thimbles 23 are formed on the circumferential surface of the medullary needle 22, and the plurality of thimbles 23 are distributed at intervals along the circumferential and axial directions of the medullary needle 22; the tip of the thimble 23 is inclined away from the medullary needle segment 2 along the radial direction of the medullary needle 22; after the medullary needle 22 is inserted into the distal medullary cavity and accompanied by the bone ingrowth effect, the cancellous bone has an effective supporting effect on the needle nail, and the thimble 23 is inclined so that it is difficult for itself to sink inside the cancellous bone, and thus the medullary needle segment 2 is difficult to sink inside the medullary cavity to improve the stability and reliability of the prosthesis installation; in order to further improve the stability of the medullary needle 22 inside the medullary cavity, the surface of the medullary needle 22 is provided with one or more of HA coating, Ti coating, sintering coating, tantalum coating, 3D printed porous Ti coating and 3D printed porous tantalum coating, so that the surface of the medullary needle 22 has a good bone ingrowth effect.

[0047] Reference Figure 1 and Figure 5 A plurality of interconnected annular grooves 12 are provided on the circumferential surface of the proximal stem 1, and the diameters of the plurality of annular grooves 12 gradually decrease along the direction from approaching to away from the main body 3 of the diaphyseal segment, and the circumferential surface of the proximal stem 1 forms a stepped structure with a taper. The medullary cavity for inserting the proximal stem 1 formed during the medullary expansion process itself has a taper, so that the proximal stem 1 can be stably fitted in the medullary cavity, and the proximal stem 1 can better fit with the cancellous bone, thereby reducing the possibility of long bone prosthesis sinking.

[0048] Reference Figure 4 and Figure 5 In order to establish a more stable fixed relationship between the long bone prosthesis and the patient's retained bone, at least one connecting plate 9 that can be bolted to the cortical bone is fixed on the proximal handle 1 or the medullary needle segment 2. In this embodiment, one connecting plate 9 is provided on the proximal handle 1, and two connecting plates 9 are provided on the medullary needle segment 2.

[0049] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A segmental long bone prosthesis, comprising a proximal stem (1) and a medullary pin segment (2), characterized in that: A main body of the diaphysis section (3) is arranged between the proximal handle (1) and the medullary needle section (2); one end of the medullary needle section (2) is inserted into one end of the main body of the diaphysis section (3); a positioning groove (21) is provided on the peripheral surface of the medullary needle section (2); a positioning hole (31) is provided on the main body of the diaphysis section (3); a positioning bead (4) embedded in the positioning groove (21) is arranged inside the positioning hole (31); a sliding sleeve (5) is sleeved on the outside of the main body of the diaphysis section (3); the positioning bead (4) is pressed between the inner wall of the sliding sleeve (5) and the bottom of the positioning groove (21); and a positioning pin (6) is arranged through the sliding sleeve (5) and the main body of the diaphysis section (3); A sliding hole (32) for the positioning pin (6) to pass through is provided on the circumferential surface of the main body (3) of the backbone segment, the length direction of the sliding hole (32) extending along the axial direction of the main body (3) of the backbone segment, and a pin receiving groove (33) communicating with the sliding hole (32) is provided inside the main body (3) of the backbone segment, a spring (7) located inside the pin receiving groove (33) is provided on the side of the positioning pin (6) away from the medullary needle segment (2), and the spring (7) is compressed between the positioning pin (6) and the bottom of the pin receiving groove (33); a clearance groove (51) for the positioning bead (4) to enter and completely escape from the positioning groove (21) is provided at one end of the inner hole of the sliding sleeve (5) close to the medullary needle segment (2); A backbone extension section (8) is arranged between the proximal handle (1) and the backbone section body (3); a proximal positioning column (11) inserted into the backbone extension section (8) is arranged at one end of the proximal handle (1) close to the backbone extension section (8); and an extension positioning column (81) inserted into the backbone section body (3) is arranged at one end of the backbone extension section (8) close to the backbone section body (3).

2. The segmental long bone prosthesis according to claim 1, characterized in that: The cross-sectional profile of the positioning groove (21) along the axial direction of the medullary needle segment (2) is an arc with a radius of curvature equal to the radius of the positioning bead (4), and the positioning groove (21) is an annular groove coaxial with the medullary needle segment (2).

3. The segmental long bone prosthesis according to claim 1, characterized in that: The diameter of the proximal positioning column (11) gradually decreases along the direction from approaching to departing from the proximal handle (1), and the taper of the proximal positioning column (11) is 1.5-3.0°.

4. The segmental long bone prosthesis according to claim 1 or 3, characterized in that: The diameter of the extended positioning column (81) gradually decreases along the direction from approaching to departing from the bone shaft extension section (8), and the taper of the extended positioning column (81) is 1.5-3.0°.

5. A segmental long bone prosthesis according to claim 1, wherein: A medullary needle (22) is arranged at one end of the medullary needle section (2) away from the main body (3) of the diaphysis section, and a plurality of ejector pins (23) are formed on the peripheral surface of the medullary needle (22), and the ejector pins (23) are inclined away from the medullary needle section (2) along the radial direction of the medullary needle (22).

6. The segmental long bone prosthesis according to claim 5, characterized in that: The surface of the medullary needle (22) is provided with one or more of HA coating, Ti coating, sintered coating and tantalum coating.

7. The segmental long bone prosthesis according to claim 1, wherein: A plurality of mutually connected annular grooves (12) are provided on the peripheral surface of the proximal handle (1), and the diameters of the plurality of annular grooves (12) gradually decrease along a direction from approaching to departing from the main body (3) of the diaphyseal segment.

8. The segmental long bone prosthesis according to claim 1, characterized in that: At least one connecting plate (9) is fixed on the proximal handle (1) or the medullary needle section (2).

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