A hollow screw assembly structure and pressurizing tool

Abstract

The present invention discloses a hollow screw assembly structure, which includes: a hollow screw and a sleeve, wherein the hollow screw and the sleeve are coaxially matched, the hollow screw including a threaded section, a first smooth section, and a clamping portion, the threaded section and the clamping portion being respectively located at both ends of the first smooth section, the clamping portion having a radially non-circular cross-section, the sleeve cavity being provided with an inner surface matching the clamping portion, the sleeve inner wall being provided with a protrusion, the clamping portion being provided with an elongated groove, the protrusion slidingly mating with the groove, the sleeve inner wall being provided with a first thread, the clamping portion cavity inner wall being provided with a sixth thread, the first and sixth threads being used to match the fifth thread of a nailing tool. The present invention provides a hollow screw assembly structure and a pressurizing tool, which have a simple structure, can achieve controllable pressurization through the pressurizing tool, and the screw sliding prevents shortening of the fracture end, and micro-motion stimulation promotes fracture healing.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a hollow screw assembly structure and a pressurizing tool. Background Art

[0002] Fractures of the femur, tibia and other limbs are common fractures in clinical practice. During the treatment process, due to the traction of the muscles at the fracture site, the affected area will cause shortening and deformity. It is difficult to reduce, restore and maintain its length during surgery. Complications such as malformation and poor lower limb force line may occur, eventually leading to traumatic arthritis, etc., seriously affecting the patient's health.

[0003] When treating limb fractures, existing methods use hollow screws alone or in combination with plates. This method applies pressure to the fracture ends through the screw's inherent structural design. However, in areas with bone defects, this pressure can easily cause deformation of the fracture ends' original anatomical form, shortening the limb and leading to complications such as malunion, prolonged healing, or even nonunion. Therefore, a slidable hollow screw assembly structure and a controllable pressure tool are needed. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a hollow screw assembly structure and a pressure tool, which has the characteristics of simple structure. There are three types of screws suitable for fractures of different locations and types. Controllable pressure can be achieved through the pressure tool, and the screw slides in the bone to prevent shortening of the fracture end, and micro-motion stimulation promotes fracture healing.

[0005] The present invention is achieved through the following technical solutions:

[0006] A hollow screw assembly structure, which includes: a hollow screw and a sleeve, the hollow screw and the sleeve are coaxially matched, and a cavity is provided in the sleeve and the hollow screw, the hollow screw includes a threaded section, a first smooth section and a clamping portion, the threaded section and the clamping portion are respectively located at the two ends of the first smooth section, the radial cross-section of the clamping portion is a non-circular cross-section, the sleeve cavity is provided with an inner surface matching the clamping portion, the inner wall of the sleeve is provided with a protrusion, the clamping portion is provided with a long strip of groove, the protrusion is slidably matched with the groove, the inner wall of the sleeve is provided with a first thread, and the inner wall of the clamping portion cavity is provided with a sixth thread, the first thread and the sixth thread are used to match the fifth thread of the nailing tool.

[0007] Optionally, the protrusion is a riveted punching hole.

[0008] Optionally, the groove is parallel to the axis of the clamping portion.

[0009] Optionally, the distance between the highest point of the protrusion and the concave plane of the groove is smaller than the concave depth of the groove, and the width of the groove is larger than the maximum diameter of the protrusion.

[0010] Optionally, a second thread is provided on the outer surface of the sleeve, and the length of the second thread is less than or equal to the length of the sleeve.

[0011] Optionally, the sleeve includes a second smooth section and an expansion section, the expansion section is provided at the proximal end of the sleeve, and the maximum diameter of the expansion section is greater than the diameter of the second smooth section.

[0012] Optionally, a cutting piece is provided at the distal end of the hollow screw.

[0013] According to an example of the present invention, a pressurizing tool is provided, which includes a pressurizing sleeve, a first screw member, a second screw member and the above-mentioned hollow screw assembly structure, the pressurizing sleeve is coaxially matched with the first screw member, the second screw member is fixedly connected to the distal end of the first screw member, the pressurizing sleeve, the first screw member and the second screw member are all provided with a cavity, the distal end of the pressurizing sleeve is provided with a screw head avoidance hole, the inner wall of the internal cavity of the pressurizing sleeve is provided with a third thread, the outer surface of the first screw member is provided with a fourth thread, the third thread matches the fourth thread, the distal end of the first screw member is provided with a rod with a non-circular cross-section, the expansion section is provided with a non-circular cross-section cavity, the cavity in the expansion section is provided with an inner surface matching the outer surface of the rod, the outer surface of the second screw member is provided with a fifth thread, the fifth thread matches the first thread.

[0014] Optionally, the minimum diameter of the screw head avoidance hole is larger than the maximum diameter of the expansion section, the diameter of the second screw member is smaller than the minimum diameter of the cavity in the expansion section, and the diameter of the second screw member is smaller than the diameter of the first screw member.

[0015] Optionally, the pressurizing tool further includes a first handpiece and a second handpiece, wherein the first handpiece is fixedly connected to the first screw member, the first handpiece is used to tightly grip the first screw member, and the second handpiece is fixedly connected to the proximal end of the pressurizing sleeve, and the second handpiece is used to rotate and pressurize the pressurizing sleeve.

[0016] The hollow screw assembly structure and pressurizing tool provided by the present invention have the following beneficial effects:

[0017] 1) The hollow screw assembly structure provided by the present invention has a simple structure, and the hollow screw and the sleeve can slide, thereby preventing shortening of the fracture end and promoting bone healing through micro-motion stimulation.

[0018] 2) During screw implantation, a pressure tool is used to relatively fix the hollow screw and the sleeve and maintain their initial state, while achieving controllable pressure.

[0019] 3) There is an anti-rotation mechanism between the sleeve and the hollow screw, which effectively prevents the screw rod from rotating in the sleeve. The anti-rotation structure is located inside the screw structure and does not contact the bone.

[0020] 4) There are three types of screws, suitable for different locations and types of fractures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a three-dimensional view of the hollow screw assembly of the present invention.

[0023] Figure 2 It is a schematic diagram of the assembly of the pressurizing tool and the hollow screw assembly of the present invention.

[0024] Figure 3 It is a cross-sectional view of the pressurizing tool of the present invention.

[0025] Figure 4 It is a three-dimensional diagram of the second structural form of the hollow screw assembly of the present invention.

[0026] Figure 5 It is a three-dimensional diagram of the third structural form of the hollow screw assembly of the present invention.

[0027] Among them, the reference numerals in the figure correspond to:

[0028] 1-sleeve, 2-threaded section, 3-first smooth section, 4-protrusion, 5-groove, 6-first thread, 7-clamping portion, 8-second thread, 9-cutting piece, 10-pressurized sleeve, 11-first screw member, 12-second screw member, 13-screw head avoidance hole, 14-third thread, 15-fourth thread, 16-fifth thread, 17-first handpiece, 18-second handpiece, 19-sixth thread. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1:

[0031] Reference Manual Figure 1 、 Figure 2 and Figure 3 , a hollow screw assembly structure, including a hollow screw and a sleeve 1, the hollow screw and the sleeve 1 are coaxially matched, and a cavity is provided in the sleeve 1 and the hollow screw, and the hollow screw includes a threaded section 2, a first smooth section 3 and a clamping portion 7, the threaded section 2 and the clamping portion 7 are respectively located at both ends of the first smooth section 3, the radial cross-section of the clamping portion 7 is a non-circular cross-section, and an inner surface matching the clamping portion 7 is provided in the cavity of the sleeve 1. The matching of the clamping portion 7 and the sleeve 1 enables an anti-rotation mechanism to exist between the two when the pressurizing tool rotates and pressurizes the hollow screw assembly structure, and no relative rotation is generated, and the anti-rotation mechanism is provided. The screw mechanism is arranged inside the sleeve to avoid contact with the bone. The inner wall of the sleeve is provided with a protrusion 4, and the clamping part 7 is provided with a long groove 5. The protrusion 4 and the groove 5 are slidably matched. The inner wall of the sleeve is provided with a first thread 6, and the inner wall of the cavity of the clamping part 7 is provided with a sixth thread 19. The first thread 6 and the sixth thread 19 are used to match the fifth thread 16 of the nailing tool, so that after the pressurizing tool is screwed into the hollow screw assembly structure, the sleeve 1 and the hollow screw are relatively fixed, ensuring that the sleeve 1 and the hollow screw will not slide relative to each other when the hollow screw is implanted, so as to facilitate controllable pressurization of the hollow screw assembly structure.

[0032] Furthermore, the protrusion 4 is a riveted punching. The groove 5 is parallel to the axis of the clamping portion 7. The distance between the highest point of the protrusion 4 and the concave plane of the groove 5 is less than the concave depth of the groove 5, and the width of the groove 5 is greater than the maximum diameter of the protrusion 4, so that the protrusion 4 slides in the groove 5 and prevents the sleeve 1 and the hollow screw from falling off. The second thread 8 provided on the outer surface of the sleeve 1 is located on the outer surface of the expansion section 21 of the sleeve 1. The length of the second thread 8 is equal to the length of the expansion section 21, and cooperates with the threaded section 2 of the hollow screw to pull the two ends of the fracture closer. The sleeve 1 includes a second smooth section 20 and an expansion section 21. The expansion section 21 is provided at the proximal end of the sleeve 1, and the maximum diameter of the expansion section 21 is greater than the diameter of the second smooth section 20. A cutting piece 9 is provided at the distal end of the hollow screw, and the cutting piece is used to cut bones.

[0033] A pressurizing tool comprises a pressurizing sleeve 10, a first screw member 11, a second screw member 12 and the above-mentioned hollow screw assembly structure, the pressurizing sleeve 10 is coaxially matched with the first screw member 11, the second screw member 12 is fixedly connected to the distal end of the first screw member 11, the pressurizing sleeve 10, the first screw member 11 and the second screw member 12 are all provided with a cavity, the distal end of the pressurizing sleeve 10 is provided with a screw head avoidance hole 13, the inner wall of the internal cavity of the pressurizing sleeve 10 is provided with a third thread 14, the outer surface of the first screw member 11 is provided with a fourth thread 15, the third thread 14 matches the fourth thread 15, the distal end of the first screw member 11 is provided with a rod with a non-circular cross-section, the expansion section 21 is provided with a non-circular cross-section cavity, the cavity in the expansion section 21 is provided with an inner surface matching the outer surface of the rod, the outer surface of the second screw member 12 is provided with a fifth thread 16, the fifth thread 16 matches the first thread 6.

[0034] Furthermore, the minimum diameter of the screw head avoidance hole 13 is greater than the maximum diameter of the expansion section 21. When the hollow screw assembly structure is pressurized, the expansion section 21 of the sleeve 1 can be rotated into the screw head avoidance hole 13. The diameter of the second screw member 12 is smaller than the minimum diameter of the cavity in the expansion section 21, and the diameter of the second screw member 12 is smaller than the diameter of the first screw member 11. The pressurization tool also includes a first handpiece 17 and a second handpiece 18. The first handpiece 17 is fixedly connected to the first screw member 11 and is used to tightly grasp the first screw member 11. The second handpiece 18 is fixedly connected to the proximal end of the pressurization sleeve 10 and is used to rotate and pressurize the pressurization sleeve 10. The pressurization tool cooperates with the hollow screw assembly structure to achieve controllable pressurization during the implantation of the hollow screw assembly into the bone. The hollow screw assembly in this embodiment is a first structural form.

[0035] Example 2:

[0036] The main difference between this embodiment and embodiment 1 is the length and position of the second thread 8 provided on the outer surface of the sleeve 1. Figure 4 In this embodiment, a second thread 8 is provided on the outer surface of the sleeve 1 , and the length of the second thread 8 is equal to the length of the sleeve 1 .

[0037] Example 3:

[0038] The difference between this embodiment and embodiments 1 and 2 is also the length and position of the second thread 8 provided on the outer surface of the sleeve 1. Figure 5 In this embodiment, the second thread 8 provided on the outer surface of the sleeve 1 is located on the outer surface of the second smooth section 20 of the sleeve 1, and the length of the second thread 8 is equal to the length of the second smooth section 20.

[0039] In the above embodiments, the screws can be of various types.

[0040] The hollow screw assembly structure provided by the present invention has a simple structure, and the hollow screw and the sleeve can slide to prevent shortening of the fracture end, and micro-motion stimulation promotes bone healing; when the screw is implanted, the hollow screw and the sleeve are relatively fixed and maintained in the initial state through a pressure tool, while achieving controllable pressure; there is an anti-rotation mechanism between the sleeve and the hollow screw, which effectively prevents the nail rod from rotating in the sleeve, and the anti-rotation structure is located inside the screw structure to avoid contact with the bone; there are three types of screws, suitable for fractures of different locations and types.

[0041] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A hollow screw assembly structure, characterized in that: The hollow screw assembly structure includes a hollow screw and a sleeve (1), wherein the hollow screw and the sleeve (1) are coaxially matched, and a cavity is provided in the sleeve (1) and the hollow screw, and the hollow screw includes a threaded section (2), a first smooth section (3) and a clamping portion (7), wherein the threaded section (2) and the clamping portion (7) are respectively located at two ends of the first smooth section (3), and the radial cross section of the clamping portion (7) is a non-circular cross section. An inner surface matching the clamping portion (7) is provided in the cavity of the sleeve (1), and the matching of the clamping portion (7) and the sleeve (1) enables an anti-rotation mechanism to exist between the two when the hollow screw assembly structure is rotated and pressurized, and relative rotation will not occur, and the anti-rotation mechanism is arranged inside the sleeve (1) to avoid contact with the bone. The inner wall of the sleeve is provided with a protrusion (4), the clamping portion (7) is provided with a long strip of groove (5), the protrusion (4) and the groove (5) are slidably matched, the distance between the highest point of the protrusion (4) and the concave plane of the groove (5) is less than the concave depth of the groove (5), the width of the groove (5) is greater than the maximum diameter of the protrusion (4), the inner wall of the sleeve is provided with a first thread (6), the inner wall of the cavity of the clamping portion (7) is provided with a sixth thread (19), the first thread (6) and the sixth thread (19) are used to match the fifth thread (16) of the nailing tool, the outer surface of the sleeve (1) is provided with a second thread (8), the length of the second thread (8) is less than or equal to the length of the sleeve (1).

2. A hollow screw assembly structure according to claim 1, characterized in that: The protrusion (4) is a riveted punching hole.

3. The hollow screw assembly structure according to claim 1, characterized in that: The groove (5) is parallel to the axis of the clamping portion (7).

4. The hollow screw assembly structure according to claim 1, characterized in that: The sleeve (1) comprises a second smooth section (20) and an expansion section (21), wherein the expansion section (21) is arranged at the proximal end of the sleeve (1), and the maximum diameter of the expansion section (21) is greater than the diameter of the second smooth section (20).

5. The hollow screw assembly structure according to claim 1, characterized in that: A cutting piece (9) is provided at the distal end of the hollow screw.

6. A pressurizing tool, characterized in that: The hollow screw assembly structure comprises a pressurizing sleeve (10), a first screw member (11), a second screw member (12) and the hollow screw assembly structure according to any one of claims 1 to 5, wherein the pressurizing sleeve (10) is coaxially matched with the first screw member (11), the second screw member (12) is fixedly connected to the distal end of the first screw member (11), the pressurizing sleeve (10), the first screw member (11) and the second screw member (12) are all provided with cavities inside, the distal end of the pressurizing sleeve (10) is provided with a screw head avoidance hole (13), the minimum diameter of the screw head avoidance hole (13) is greater than the maximum diameter of the expansion section (21), and when the hollow screw assembly structure is pressurized, the sleeve The expansion section (21) of the cylinder (1) can be screwed into the screw head avoidance hole (13), the inner wall of the internal cavity of the pressurizing sleeve (10) is provided with a third thread (14), the outer surface of the first screw member (11) is provided with a fourth thread (15), the third thread (14) matches the fourth thread (15), the distal end of the first screw member (11) is provided with a rod with a non-circular cross-section, the expansion section (21) is provided with a non-circular cross-section cavity, the inner cavity of the expansion section (21) is provided with an inner surface matching the outer surface of the rod, the outer surface of the second screw member (12) is provided with a fifth thread (16), the fifth thread (16) matches the first thread (6).

7. A pressurizing tool according to claim 6, characterized in that: The diameter of the second screw member (12) is smaller than the minimum diameter of the cavity in the expansion section (21), and the diameter of the second screw member (12) is smaller than the diameter of the first screw member (11).

8. A pressurizing tool according to claim 7, characterized in that: The invention also includes a first hand piece (17) and a second hand piece (18), wherein the first hand piece (17) is fixedly connected to the first screw piece (11), and the first hand piece (17) is used to tightly grasp the first screw piece (11); the second hand piece (18) is fixedly connected to the proximal end of the pressurizing sleeve (10), and the second hand piece (18) is used to rotate and pressurize the pressurizing sleeve (10).

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