A bidirectional adjustable elastic intramedullary nail

Abstract

The application discloses a bidirectional adjustable elastic intramedullary nail, which comprises an intramedullary nail main nail with a hollow structure, wherein the intramedullary nail main nail comprises an intramedullary nail proximal end and an intramedullary nail body in an integrated structure, the diameter of the intramedullary nail proximal end is larger than that of the intramedullary nail body, a power screw hole penetrating through the intramedullary nail proximal end is arranged, an adjusting hole is arranged on the intramedullary nail body away from the intramedullary nail proximal end, a power bone screw is installed in the power screw hole, the power bone screw can move axially along the power screw hole, a tail cap is installed on the intramedullary nail proximal end side, an elastic body is arranged between the tail cap and the power bone screw, an absorbable gasket is arranged below the power bone screw, the absorbable gasket supports the power bone screw, and an adjusting device for adjusting the stress of a fracture end is arranged on the intramedullary nail body. The stress of the fracture end can be adjusted according to the specific condition of the fracture, the stress of the fracture end is avoided to be blocked, the fracture healing is accelerated, the delayed healing and non-healing of the fracture are reduced, and the incidence of the fracture after the intramedullary nail is removed is reduced.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a bidirectional adjustable elastic intramedullary nail. Background Technology

[0002] Internal fixation with bone plates and intramedullary nails has been used clinically for many years to treat fractures. Among the various methods of fracture fixation used in clinical practice, intramedullary nailing is one of the most commonly used. Traditional intramedullary nailing involves fixing the fractured bone to the nail with screws, making the nail and bone integrated. However, in the later stages of fracture repair, the stress shielding effect of the intramedullary nail prevents adequate stress stimulation to the fracture ends, leading to drawbacks such as delayed bone union, nonunion, slow bone mineralization, prolonged internal fixation time, and refracture after nail removal. These limitations restrict its widespread application. Therefore, designing an intramedullary nail that can adjust the stress at the fracture ends according to the fracture healing process and avoid stress shielding is a pressing issue that needs to be addressed. Summary of the Invention

[0003] The purpose of this invention is to provide a bidirectional adjustable elastic intramedullary nail to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A bidirectional adjustable elastic intramedullary nail includes a main intramedullary nail, which is a hollow structure. The main intramedullary nail includes a proximal end and a main body, which are integrally formed. The diameter of the proximal end is larger than that of the main body. Multiple through-holes for dynamic screws are provided at the proximal end of the intramedullary nail. Multiple through-holes for static screws are provided on the main body of the intramedullary nail, away from the proximal end. Dynamic bone screws are installed in the dynamic screw holes and are axially movable along the holes. Static bone screws are installed in the static screw holes. A tail cap is installed on the proximal side of the nail. An elastomer is positioned between the tail cap and the dynamic bone screw. An absorbable washer is positioned below the dynamic bone screw to support it.

[0006] As a further optimization of this application, the absorbable washer is installed in one of the following ways: a) a boss is provided on the inner side of the proximal end of the intramedullary nail, and an absorbable washer is provided on the boss; b) an internal thread is provided on the inner wall of the proximal end of the intramedullary nail, and an external thread is provided on the outer side of the absorbable washer, and the absorbable washer is threadedly connected to the inner wall of the proximal end of the intramedullary nail.

[0007] Furthermore, the tail cap can be installed in one of the following ways: a) an internal thread is provided on the inner side of the proximal end of the intramedullary nail, and an external thread matching the internal thread is provided on the tail cap, which is threadedly connected to the proximal end of the intramedullary nail; b) an annular groove and a vertical guide groove communicating with the annular groove are provided on the inner side of the proximal end of the intramedullary nail, and a protrusion is provided at the head end of the tail cap, which can slide along the annular groove and the vertical guide groove; c) an expansion sleeve is provided at the head of the tail cap.

[0008] Furthermore, when the power screw hole is configured as two through holes, an upper power screw and a lower power screw are respectively installed in the upper power screw hole and the lower power screw hole.

[0009] Furthermore, the absorbable washer can be located below the upper power screw hole, or below the lower power screw hole, or both the upper and lower power screw holes can be equipped with absorbable washers.

[0010] Furthermore, an elastomer is installed between the absorbable washer and the upper or lower dynamic bone screw.

[0011] Furthermore, the first and second elastic bodies can be configured as one of the following: a pressure-adjusting spring one, an elastic balloon one, a pressure-adjusting spring two, and an elastic balloon two. When it is spring one, the installation form of spring one is one of the following: a) installing the pressure-adjusting spring one in the cavity formed by the inner wall of the tail cap, the upper dynamic bone screw, and the proximal end of the intramedullary nail; b) the proximal end of the intramedullary nail is fitted with a guide sleeve, which can be configured as a half-sleeve or a full-sleeve. When it is a half-sleeve, the guide sleeve is located above the lower dynamic screw hole, and the guide sleeve is provided with a through hole corresponding to the upper dynamic screw hole; when it is a full-sleeve, the guide sleeve is respectively provided with... Through holes corresponding to the upper and lower power screw holes; the guide sleeve can be configured as an inner guide sleeve or an outer guide sleeve. When it is an inner guide sleeve, it is fitted inside the proximal end of the intramedullary nail; when it is an outer guide sleeve, it is fitted outside the proximal end of the intramedullary nail. The pressure adjusting spring is fitted outside the proximal end of the intramedullary nail and the tail cap, with one end abutting against the guide sleeve and the other end abutting against the convex edge of the tail cap; when the elastic body is an elastic balloon, the elastic balloon is located in the cavity formed by the tail cap, the upper power bone screw, and the inner wall of the proximal end of the intramedullary nail. A balloon base is provided below the elastic balloon and the elastic balloon.

[0012] Furthermore, an upper magnetic body is provided inside the tail cap, and the upper magnetic body is tightly connected to the tail cap. Under the action of an external magnetic field, the upper magnetic body can drive the tail cap to move up and down along the proximal end of the intramedullary nail.

[0013] Furthermore, an adjusting sleeve is provided below the upper or lower dynamic bone screw, and an elastic body II is installed between the adjusting sleeve and the upper or lower dynamic bone screw. A lower magnetic body is installed inside the adjusting sleeve, and the adjusting sleeve is threadedly connected to the proximal end of the intramedullary nail.

[0014] Furthermore, the power screw hole is an oblique hole or a transverse hole; a graduated hole is provided on the side wall of the proximal end of the intramedullary nail, and the graduated hole is provided in a one-to-one correspondence with the elastomer.

[0015] Furthermore, a through-hole fixation screw is provided below the power screw hole at the proximal end of the intramedullary nail, and a fixation bone screw is installed in the fixation screw hole; the main nail of the intramedullary nail is set with a curvature that conforms to the human bone.

[0016] This invention offers easy fixation, convenient operation, a simple design, and wide applicability. It allows for adjustment of stress at the fracture ends using absorbable pads and elastomers one and two, preventing stress shielding and stimulating the body to form new bone to accelerate fracture healing. It not only provides strong internal fixation with intramedullary nails but also applies controllable and appropriate axial stress to the fracture ends, thus avoiding the contradiction between stress shielding and stress stimulation. This reduces the incidence of nonunion and delayed healing caused by stress shielding, decreases the rate of refracture after intramedullary nail removal, accelerates fracture healing, and shortens the fixation time of the intramedullary nail. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0022] Figure 6 This is a schematic diagram of the proximal end of the intramedullary nail in Embodiment Six of the present invention;

[0023] Figure 7 This is a schematic diagram of the tail cap structure in Embodiment Six of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of Embodiment Six of the present invention;

[0025] Figure 9 This is a schematic diagram of the structure of Embodiment Seven of the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of Embodiment 8 of the present invention;

[0027] Figure 11This is a schematic diagram of the structure of Embodiment Nine of the present invention;

[0028] Figure 12 This is a schematic diagram of the structure of Embodiment 10 of the present invention;

[0029] Figure 13 This is a schematic diagram of the structure of Embodiment Eleven of the present invention;

[0030] Figure 14 This is a schematic diagram of the structure of Embodiment Twelve of the present invention;

[0031] Figure 15 This is a schematic diagram of the structure of Embodiment Thirteen of the present invention;

[0032] Figure 16 This is a schematic diagram of the structure of Embodiment Fourteen of the present invention;

[0033] Figure 17 This is a schematic diagram of the structure of Embodiment 15 of the present invention;

[0034] Figure 18 This is a schematic diagram of the structure of Embodiment Sixteen of the present invention;

[0035] In the diagram: 1-Intramedullary nail body, 2-Tail cap, 3-Proximal end of intramedullary nail, 4-Upper dynamic screw hole, 5-Upper dynamic bone screw, 6-Static screw hole, 7-Fixed bone screw, 8-Lower static bone screw, 9-Absorbable washer, 10-Protrusion, 11-Annular groove, 12-Vertical guide groove, 13-Lower dynamic screw hole, 14-Lower dynamic bone screw, 15-Spring 1, 16-Expansion sleeve, 17-Lower magnet, 18-Spring 2, 19-Elastic balloon 1, 20-Semi-guide sleeve, 21-Full guide sleeve, 22-Adjusting screw sleeve, 23-Graded hole, 24-Spring base, 25-Upper magnet. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. In the description of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can be fixed connections, detachable connections, integral connections or mechanical connections; they can be direct connections or indirect connections through an intermediate medium; and they can be internal connections between two components.

[0037] Example 1, as Figure 1As shown, a bidirectional adjustable elastic intramedullary nail includes a main intramedullary nail, which is a hollow structure. The main intramedullary nail includes a proximal end 3 and a main body 1, which are integrally formed. The diameter of the proximal end 3 is larger than the diameter of the main body 1. Two through-holes for power screws are provided at the proximal end 3, and power bone screws are installed in these holes. The power bone screws can move axially along the power screw holes. The upper power screw hole 4 and the lower power screw hole are also described. The intramedullary nail body 1 is equipped with an upper dynamic bone screw 5 and a lower dynamic bone screw 14. Two through static screw holes 6 are provided on the intramedullary nail body 1 away from the proximal end 3 of the intramedullary nail. Static bone screws are installed in the static screw holes 6. Upper static bone screws 7 and lower static bone screws 8 are installed in the upper static screw holes 6 and the lower static screw holes 6, respectively. A tail cap 2 is installed on the proximal end 3 side of the intramedullary nail. The inner wall of the proximal end 3 of the intramedullary nail is provided with internal threads. The tail cap 2 is provided with external threads that match the internal threads. The tail cap 2 is threadedly connected to the proximal end 3 of the intramedullary nail.

[0038] In this embodiment, an absorbable washer 9 is provided below the upper dynamic bone screw 5. The absorbable washer 9 supports the upper dynamic bone screw 5, and after absorption, it no longer applies upward axial stress to the upper dynamic bone screw. The inner wall of the proximal end 3 of the intramedullary nail is provided with internal threads, and the outer side of the absorbable washer 9 is provided with external threads. The absorbable washer 9 is threadedly connected to the inner wall of the proximal end 3 of the intramedullary nail. A pressure adjusting spring 15 is installed in the cavity formed by the tail cap 2, the upper dynamic bone screw 5, and the inner wall of the proximal end 3 of the intramedullary nail.

[0039] When using a bidirectional adjustable elastic intramedullary nail to fix bone, it is inserted into the fractured bone shaft according to standard intramedullary nailing procedures. The main body 1 of the intramedullary nail is fixed to one end of the fractured bone via a lower static bone screw 8. An absorbable washer 9 is implanted in the proximal end 3 of the intramedullary nail. Then, the lower dynamic bone screw 14 and the upper dynamic bone screw 5, located at the proximal end 3 of the intramedullary nail, fix the other end of the fractured bone. Next, a pressure adjusting spring 15 is implanted in the proximal end 3 of the intramedullary nail, and a tail cap 2 is screwed in to apply downward axial stress to the pressure adjusting spring 15, which in turn applies downward axial stress to the upper dynamic bone screw 5. This device is then implanted into the human body. After a period of time, the absorbable washer 9 is absorbed and no longer applies upward axial stress to the upper dynamic bone screw 5. The bone fixed to the proximal end 3 of the intramedullary nail is subjected to downward axial stress by the adjusting spring 15. This, in turn, applies a reverse axial force proximal to the upper dynamic bone screw 5, the adjusting spring 15, the tail cap 2, the proximal end 3 of the intramedullary nail, the main body 1 of the intramedullary nail, and the distal upper and lower static bone screws 8. This applies axial stress to the distal bone and fracture ends, ensuring that physiological stress stimulation and transmission are always present during fracture healing, thus promoting fracture healing. The elastic force of the adjusting spring 15 can be determined by controlling the depth of insertion of the tail cap 2.

[0040] Example 2, as Figure 2 As shown, the difference from Embodiment 1 is that an absorbable washer 9 is provided below the lower dynamic bone screw 14, and the absorbable washer 9 is supported by the transition part of the proximal end 3 of the intramedullary nail and the main body 1 of the intramedullary nail, while the upper part of the absorbable washer 9 supports the lower dynamic bone screw 14. Screwing in the tail cap 2 applies downward axial stress to the pressure adjusting spring 15, which in turn applies downward axial stress to the upper dynamic bone screw 5. The bone fixed to the proximal end 3 of the intramedullary nail is subjected to downward axial stress by the pressure adjusting spring 15, which in turn applies an upward reverse axial force to the upper dynamic bone screw 5, the pressure adjusting spring 15, the tail cap 2, the proximal end 3 of the intramedullary nail, the main body 1 of the intramedullary nail, and the distal upper static bone screw and lower static bone screw 8. Due to the obstruction effect of the lower dynamic bone screw 14 and the absorbable washer 9 below it on the proximal end 3 of the intramedullary nail and the main body 1 of the intramedullary nail, axial stress cannot be applied to the fracture ends. After the device is implanted in the human body for a period of time, the absorbable washer 9 is absorbed and no longer applies obstruction effect to the proximal end 3 of the intramedullary nail and the main body 1 of the intramedullary nail. Then, the main body 1 of the intramedullary nail drives the distal upper static bone screw and lower static bone screw 8 to apply an upward axial stress to the fracture ends, so that there is always physiological stress stimulation and transmission during the fracture healing process, promoting fracture healing.

[0041] Example 3, as Figure 3 As shown, the difference from Embodiment 1 is that an absorbable washer 9 is provided above the upper dynamic bone screw 5, supported by the upper dynamic bone screw 5, and the upper part of the absorbable washer 9 abuts against the tail cap 2. A guide sleeve is fitted on the outer side of the proximal end 3 of the intramedullary nail. The guide sleeve is in the form of a semi-guide sleeve 20, located above the lower dynamic screw hole 13. The semi-guide sleeve 20 has a through hole corresponding to the upper dynamic screw hole 4. A pressure adjusting spring 15 is fitted on the outer side of the proximal end 3 of the intramedullary nail and the tail cap 2, with one end abutting against the upper end of the semi-guide sleeve 20 and the other end abutting against the convex edge of the tail cap 2.

[0042] Example 4, as Figure 4 As shown, the difference from Embodiment 3 is that a guide sleeve is fitted on the outer side of the proximal end 3 of the intramedullary nail. The guide sleeve is set in the form of a full guide sleeve 21, and the full guide sleeve 21 is provided with through holes corresponding to the upper power screw hole 4 and the lower power screw hole 13, respectively.

[0043] Example 5, such as Figure 5 As shown, the difference from Embodiment 4 is that the full guide sleeve 21 is fitted inside the proximal end 3 of the intramedullary nail, and an absorbable washer 9 is provided below the lower dynamic bone screw 14. The absorbable washer 9 is supported by the transition part between the proximal end 3 of the intramedullary nail and the main body of the intramedullary nail, and the upper part of the absorbable washer 9 supports the full guide sleeve 21.

[0044] Example 6, as Figure 6 , Figure 7 , Figure 8As shown, the difference from Embodiment 5 lies in the installation form of the tail cap 2. In this embodiment, an annular groove 11 and a vertical guide groove 12 communicating with the annular groove 11 are provided along the inner side of the proximal end 3 of the intramedullary nail. The head end of the tail cap 2 is provided with a protrusion 10. The protrusion 10 can slide vertically along the vertical guide groove 12 and can rotate along the annular groove 11.

[0045] Example 7, as Figure 9 As shown, the difference from Embodiment 6 lies in the installation method of the tail cap 2. An expansion sleeve 16 is provided at the head of the tail cap 2. The tail cap 2 and the expansion sleeve 16 are threaded together. The lower arm of the expansion sleeve 16 is thickened and the side wall is provided with a slot, dividing the side wall into more than 3 parts. By screwing in the tail cap 2, the lower side wall of the expansion sleeve 16 can be fixed to the inner wall of the proximal end 3 of the intramedullary nail.

[0046] Example 8, as Figure 10 As shown, the difference from Embodiment 2 lies in the form of the elastomer. In this embodiment, the elastomer is an elastic capsule 19, and a capsule base is provided below the elastic capsule 19. The capsule base is located above the upper dynamic bone screw 5.

[0047] Example 9, as Figure 11 As shown, the difference from Embodiment 2 is that an upper magnetic body 25 is fixedly installed inside the tail cap 2. The upper magnetic body 25 can drive the tail cap 2 to move up and down along the proximal end 3 of the intramedullary nail under the action of an external magnetic field. Then, the axial stress of the fracture end can be adjusted by adjusting the axial stress of the pressure adjusting spring 15. The stress magnitude can be read from the scale hole set on the side wall of the proximal end 3 of the intramedullary nail. Appropriate stress stimulation can be given to the fracture end according to the fracture type and fracture healing status to accelerate fracture healing.

[0048] Example 10, as follows Figure 12 As shown, the difference from Embodiment Six is ​​that the proximal end 3 of the intramedullary nail is fitted with a guide sleeve, which is configured as a semi-guide sleeve 20. The semi-guide sleeve 20 is located above the lower power screw hole 13, and the semi-guide sleeve 20 is provided with a through hole corresponding to the upper power screw hole 4. The pressure adjusting spring 15 is fitted on the outside of the proximal end 3 of the intramedullary nail and the tail cap 2, with one end abutting against the semi-guide sleeve 20 and the other end abutting against the convex edge of the tail cap 2.

[0049] Example 11, as follows Figure 13 As shown, the difference from Embodiment 1 is that an adjusting sleeve 22 is provided below the upper dynamic bone screw 5. A second spring 18 is installed between the absorbent washer 9 and the upper dynamic bone screw 5. A lower magnet 17 is installed inside the adjusting sleeve 22, and the adjusting sleeve 22 is threadedly connected to the proximal end 3 of the intramedullary nail. The lower magnet 17 can drive the adjusting sleeve 22 to move up and down under the action of an external magnetic field, adjusting the axial stress of the second spring 18, thereby applying different upward axial stresses to the upper dynamic bone screw 5, and thus adjusting the axial stress at the fracture end.

[0050] Example 12, as Figure 14 As shown, the difference from Embodiment Eleven is that an upper magnetic body 25 is fixedly installed inside the tail cap 2. The upper magnetic body 25 can drive the tail cap 2 to move up and down along the proximal end 3 of the intramedullary nail under the action of an external magnetic field, in order to adjust the axial stress of the spring-15, and thus adjust the axial stress of the fracture end.

[0051] Example 13, as Figure 15 As shown, the difference from Embodiment Eleven is that an upper magnetic body 25 is fixedly installed inside the tail cap 2. The upper magnetic body 25 can drive the tail cap 2 to move up and down along the proximal end 3 of the intramedullary nail under the action of an external magnetic field. A graduated hole 23 is provided on the side wall of the proximal end 3 of the intramedullary nail, and the graduated hole 23 is correspondingly provided with spring 15. The elastic force of spring 15 can be determined by the depth to which the tail cap 2 is screwed in, and the magnitude of the stress at the fracture end can be estimated by the depth to which the tail cap 2 is screwed in.

[0052] Example 14, as Figure 16 As shown, the difference from Embodiment 2 is that the power screw hole is set as an oblique hole, the spring base 24 below the spring 15 is adapted to the oblique angle of the upper power bone screw 5, and the absorbent washer 9 is adapted to the oblique angle of the lower power bone screw 14.

[0053] Example 15, as follows Figure 17 As shown, the difference from Embodiment Fourteen is that a guide sleeve is fitted on the outer side of the proximal end 3 of the intramedullary nail, which is set in the form of a full guide sleeve 21. The full guide sleeve 21 is provided with through holes corresponding to the upper power screw hole 4 and the lower power screw hole 13. The pressure adjusting spring 15 is fitted on the outer side of the proximal end 3 of the intramedullary nail and the tail cap 2, with one end abutting against the guide sleeve 21 and the other end abutting against the convex edge of the tail cap 2. The stress at the fracture end is adjusted by the full guide sleeve 21 through the upper power bone screw 5 and the lower power bone screw 14.

[0054] Example 16, as follows Figure 18 As shown, the difference from Embodiment 1 is that a through-hole fixation screw hole is provided below the power screw hole at the proximal end of the intramedullary nail, and a fixation bone screw 7 is installed in the fixation screw hole.

[0055] In the above embodiments, the intramedullary nail master screw is configured with a curvature that is compatible with human bone.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bidirectional adjustable elastic intramedullary nail comprising an intramedullary nail main pin, characterized in that: The main nail of the intramedullary nail is a hollow structure, and the main nail of the intramedullary nail comprises an intramedullary nail proximal end and an intramedullary nail body, the intramedullary nail proximal end and the intramedullary nail body are an integral structure, the diameter of the intramedullary nail proximal end is larger than the diameter of the intramedullary nail body, a through power screw hole is arranged at the intramedullary nail proximal end, a through static screw hole is arranged on the intramedullary nail body away from the intramedullary nail proximal end, a power bone screw is installed in the power screw hole, the power bone screw can move axially along the power screw hole, a static bone screw is installed in the static screw hole, a tail cap is installed on the side of the intramedullary nail proximal end, an elastic body one is arranged between the tail cap and the power bone screw, an absorbable gasket is arranged below the power bone screw, the absorbable gasket supports the power bone screw, the tail cap gives the power bone screw an axial stress downward through the elastic body one, and the absorbable gasket is gradually removed from the support of the power bone screw after being absorbed by the human body. An internal thread is arranged on the inner side of the intramedullary nail proximal end, an external thread matched with the internal thread is arranged on the tail cap, the tail cap is threadedly connected with the intramedullary nail proximal end, an upper magnetic body is arranged in the tail cap, the upper magnetic body is tightly connected with the tail cap, and the upper magnetic body can drive the tail cap to move up and down along the intramedullary nail proximal end under the action of an external magnetic field. An adjusting sleeve and an elastic body two are arranged between the power bone screw and the absorbable gasket, the adjusting sleeve is threadedly connected with the intramedullary nail proximal end, a lower magnetic body is installed in the adjusting sleeve, and the lower magnetic body can drive the adjusting sleeve to move up and down along the intramedullary nail proximal end under the action of an external magnetic field. The installation form of the absorbable gasket is one of the following modes: a, a boss is arranged on the inner side of the intramedullary nail proximal end, and the absorbable gasket is arranged on the boss; b, an internal thread is arranged on the inner wall of the intramedullary nail proximal end, and an external thread is arranged on the outer side of the absorbable gasket, and the absorbable gasket is threadedly connected with the inner wall of the intramedullary nail proximal end. A scale hole is arranged on the side wall of the intramedullary nail proximal end, the scale hole displays the screwing depth of the tail cap, and the stress of the elastic body one is determined according to the screwing depth of the tail cap. The elastic body one is a pressure regulating spring one, a guide sleeve is sleeved on the intramedullary nail proximal end, the guide sleeve is an external guide sleeve, i.e., the guide sleeve is sleeved on the outer side of the intramedullary nail proximal end, a through hole corresponding to the power screw hole is arranged on the guide sleeve, the pressure regulating spring one is sleeved on the outer side of the intramedullary nail proximal end and the tail cap, one end of the pressure regulating spring one abuts against the guide sleeve, and the other end of the pressure regulating spring one abuts against the eaves of the tail cap.

2. The bidirectional adjustable elastic intramedullary nail of claim 1, wherein: When the power screw hole is arranged as two through holes, an upper power screw hole and a lower power screw hole, an upper power bone screw and a lower power bone screw are respectively installed in the upper power screw hole and the lower power screw hole.

3. The bidirectionally adjustable elastic intramedullary nail of claim 2, wherein: The absorbable gasket can be arranged below the upper power screw hole, or below the lower power screw hole, or below both the upper power screw hole and the lower power screw hole.

4. The bidirectionally adjustable elastic intramedullary nail of claim 3, wherein: The elastic body two is installed between the absorbable gasket and the upper power bone screw or the lower power bone screw.

5. The bidirectionally adjustable elastic intramedullary nail of Claim 1, wherein: The power screw hole is an inclined hole or a horizontal hole, and the scale hole is arranged corresponding to the elastic body one.

6. The bidirectionally adjustable elastic intramedullary nail of claim 5, wherein: A through fixing screw hole is arranged below the power screw hole at the intramedullary nail proximal end, a fixing bone screw is installed in the fixing screw hole, and the intramedullary nail main nail is arranged to have a curvature suitable for the human bone.

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