Expansion interface screw

Abstract

The utility model discloses an expansion interface screw which comprises a core rod and an outer sleeve, the outer sleeve is a hollow piece with two open ends, the core rod is arranged in the outer sleeve, the outer sleeve comprises a plurality of elastic pieces which are integrally arranged, the elastic pieces are distributed in a conical shape, and when the core rod moves towards the elastic pieces, the elastic pieces are clamped in the outer sleeve. And the elastic piece is interfered, so that the elastic piece deforms in the direction far away from the central axis of the outer sleeve. After the interface screw is implanted through the bone channel, the core rod in the middle is rotated to move downwards, the head of the core rod abuts against the inner conical face of the interface screw, the interface screw is provided with the elastic piece and can move outwards under the acting force of the core rod, and therefore the head of the interface screw can be expanded and expanded, and the fixing strength and the anti-pulling capacity are enhanced. And the condition that the patient suffers from the pain of the second operation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an expansion interface screw. Background Art

[0002] Interference screws are implants that are mainly used to fix tendon or ligament bone fragments to the femoral and tibial bone tunnels during cruciate ligament reconstruction. Interference screws are generally used to fix ligaments near human joints, such as Achilles tendon repair, flexor digitorum longus (FDL), flexor digitorum longus (FHL) and lateral ligament repair and reconstruction. They can also be used for elbow joints (UCL, LRTI, distal biceps), shoulder joints (rotator cuff repair, proximal biceps), collateral ligament repair and reconstruction, and anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) reconstruction.

[0003] Traditional interference screws do not have the function of expansion. During use or after surgery, the fixation strength of the interface screws is weakened in some patients due to osteoporosis and other characteristics, resulting in fixation failure and loss of surgical recovery function, and the patient suffers the pain of a second surgery. Utility Model Content

[0004] The purpose of the utility model is to provide an expansion interface screw to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: expansion interface screws, including

[0006] Core rod,

[0007] And a jacket, the jacket is a hollow part with openings at both ends, the core rod is placed in the jacket, the jacket includes a plurality of elastic parts that are integrally arranged, and the plurality of elastic parts are distributed in a cone shape. When the core rod moves toward the elastic parts, an interference effect is generated on the elastic parts, causing the elastic parts to deform in a direction away from the central axis of the jacket.

[0008] Furthermore, the jacket includes a plurality of through slots opened on its side, one end of the through slots extends to connect with an opening at one end of the jacket, and the other end extends to the middle of the jacket, so that an elastic member is formed between the through slots, and the elastic member has an elastic reset function. When subjected to a force, it will expand outward, and when not subjected to a force, it will reset itself according to its own rebound force and return to the expanded state.

[0009] Furthermore, the outer sleeve also includes an external thread 1 provided on its outer wall, through which the outer sleeve can be implanted into the bone channel, and through thread engagement, the outer thread can be implanted into the bone channel by using the external thread to fix it.

[0010] Furthermore, a drive interface 1 is provided at one end of the outer sleeve, and the drive interface 1 is a multi-faceted groove arranged at the end of the outer sleeve, which is used to control the rotation of the outer sleeve, so that the tool can control the rotation of the outer sleeve through the drive interface 1.

[0011] Furthermore, the outer sleeve also includes an internal thread arranged on its inner wall, one end of the internal thread extends to connect with the driving interface, and the other end extends to connect with the through groove.

[0012] Furthermore, the elastic member also includes a protrusion arranged on its inner wall, and the distance between the bottom end of the protrusion and the central axis of the outer sleeve is smaller than the radius of the core rod. When the core rod moves away from the end of the internal thread, it will generate a thrust on the elastic member, causing the elastic member to deform in a direction away from the central axis of the outer sleeve.

[0013] Furthermore, one end of the protrusion close to the internal thread is at the upper side, and the other end thereof is at the lower side.

[0014] Furthermore, the core rod includes a first rod segment and a second rod segment, and the first rod segment and the second rod segment are connected together.

[0015] Furthermore, the second rod segment can only be displaced below the internal thread.

[0016] Furthermore, the first rod segment is located above the second rod segment, so the direction from the first rod segment to the second rod segment is downward, and the direction from the second rod segment to the first rod segment is upward.

[0017] Furthermore, the first rod segment includes two external threads arranged on its outer wall, and the two external threads are engaged with the internal threads, and the core rod and the outer sleeve can be displaced through the two external threads; when the core rod rotates, the two external threads are engaged with the internal threads, thereby causing the core rod to be displaced in the outer sleeve.

[0018] Furthermore, a second drive interface is provided at one end of the first rod segment. The second drive interface is a straight groove arranged at the end of the first rod segment and is used to control the rotation of the core rod so that the tool can control the rotation of the core rod through the second drive interface.

[0019] The beneficial effects achieved by the utility model are:

[0020] 1. After the interface screw is implanted through the bone channel, the utility model rotates the middle core rod to move the core rod downward, and the core rod head presses against the inner conical surface of the interface screw. Since there is an elastic member on the interface screw, it can move outward under the force of the core rod, so that the head of the interface screw can expand and expand, thereby enhancing the fixing strength and pull-out resistance, and reducing the patient's need to endure the pain of a second operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereoscopic diagram of the expansion interface screw of the utility model;

[0022] Figure 2 It is a three-dimensional diagram of the jacket of the utility model;

[0023] Figure 3 It is a three-dimensional diagram of the core rod of the utility model;

[0024] Figure 4 It is a front cross-sectional view of the expansion interface screw of the utility model;

[0025] In the figure: 1, core rod; 2, outer sleeve; 3, elastic member; 4, through groove; 5, external thread 1; 6, drive interface 1; 7, internal thread; 8, first rod section; 9, second rod section; 10, protrusion; 11, external thread 2; 12, drive interface 2. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings.

[0027] See also Figure 1-Figure 4 The utility model provides a technical solution: an expansion interface screw, comprising a core rod 1 and a jacket 2, the jacket 2 is a hollow member with openings at both ends, the core rod 1 is placed in the jacket 2, the jacket 2 comprises a plurality of elastic members 3 integrally arranged, the plurality of elastic members 3 are distributed in a cone shape, when the core rod 1 moves toward the elastic member 3, interference is generated on the elastic member 3, causing the elastic member 3 to deform in a direction away from the central axis of the jacket 2; after the jacket 2 is implanted into the bone channel, the middle core rod 1 can be rotated to move the core rod 1 downward, one end of the core rod 1 lifts the elastic member 3, causing the elastic member 3 to deform, and it will move in a direction away from the central axis of the jacket 2, thereby expanding the end of the jacket 2, thereby enhancing the fixing strength and pull-out resistance, and reducing the secondary injury suffered by the patient.

[0028] The outer sleeve 2 includes a plurality of through slots 4 on its side, one end of the through slots 4 extends to connect with an opening at one end of the outer sleeve 2, and the other end extends to the middle of the outer sleeve 2, so that an elastic member 3 is formed between the through slots 4; the elastic member 3 has the function of automatic reset. When the elastic member 3 is acted upon by the core rod 1, it will expand outward. When it is not acted upon by the core rod 1, its own elasticity will cause it to automatically reset, so that it is convenient to remove the interface screw after it is not used.

[0029] The outer sleeve 2 also includes an external thread 5 arranged on its outer wall, and the outer sleeve 2 can be implanted into the bone channel through the external thread 5; by rotating the outer sleeve 2, the outer sleeve 2 can be displaced in the bone channel according to the external thread 5, and the thread engagement makes the displacement of the outer sleeve more stable and accurate.

[0030] A driving interface 6 is provided at one end of the outer sleeve 2. The driving interface 6 is a multi-faceted groove arranged at the end of the outer sleeve 2 and is used to control the rotation of the outer sleeve 2. The outer sleeve 2 can be easily rotated and displaced using a tool with the same multi-faceted surface.

[0031] The outer sleeve 2 also includes an internal thread 7 arranged on its inner wall, one end of the internal thread 7 extends to connect with the driving interface 1 6, and the other end extends to connect with the through groove 4.

[0032] The elastic member 3 also includes a protrusion 10 arranged on its inner wall. The distance between the bottom end of the protrusion 10 and the central axis of the outer sleeve 2 is smaller than the radius of the core rod 1. When the core rod 1 moves away from the end of the internal thread 7, it will generate a thrust on the elastic member 3, causing the elastic member 3 to deform in a direction away from the central axis of the outer sleeve 2; when the core rod 1 moves downward, it will generate a force on the protrusion 10, causing the protrusion 10 to drive the elastic member 3 to deform.

[0033] The core rod 1 includes a first rod segment 8 and a second rod segment 9 , and the first rod segment 8 and the second rod segment 9 are connected together.

[0034] The second rod section 9 can only be displaced below the internal thread 7 .

[0035] The first rod section 8 includes an external thread 11 arranged on its outer wall, and the external thread 11 is meshed with the internal thread 7. The core rod 1 and the outer sleeve 2 can be displaced through the external thread 11. After the core rod 1 is placed in the outer sleeve 2, the core rod 1 is rotated. According to the principle of thread meshing, the core rod 1 can be driven to be displaced in the outer sleeve 2 through the external thread 11 and the internal thread 7.

[0036] A driving interface 2 12 is provided at one end of the first rod segment 8. The driving interface 2 12 is a straight groove arranged at the end of the first rod segment 8 for controlling the rotation of the core rod 1. A tool with a straight protrusion is inserted into the straight groove to easily control the rotation of the core rod 1.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. Expansion interface screw, characterized by: include Core rod (1), and a jacket (2), the jacket (2) being a hollow member with openings at both ends, the core rod (1) being disposed in the jacket (2), the jacket (2) comprising a plurality of elastic members (3) integrally arranged, the plurality of elastic members (3) being distributed in a conical shape, and when the core rod (1) moves toward the elastic members (3), an interference effect is generated on the elastic members (3), causing the elastic members (3) to deform in a direction away from the central axis of the jacket (2).

2. The expansion interface screw according to claim 1, characterized in that: The outer sleeve (2) includes a plurality of through slots (4) formed on its side, one end of the through slots (4) extending to engage with an opening at one end of the outer sleeve (2), and the other end extending to the middle of the outer sleeve (2), so that an elastic member (3) is formed between two of the through slots (4).

3. The expansion interface screw according to claim 2, characterized in that: The outer sleeve (2) further comprises an external thread (5) provided on its outer wall, and the outer sleeve (2) can be implanted into the bone channel through the external thread (5).

4. The expansion interface screw according to claim 2, characterized in that: A drive interface 1 (6) is provided at one end of the outer sleeve (2); the drive interface 1 (6) is a multi-faceted groove provided at the end of the outer sleeve (2) and is used to control the rotation of the outer sleeve (2).

5. The expansion interface screw according to claim 4, characterized in that: The outer sleeve (2) further comprises an internal thread (7) provided on its inner wall, one end of the internal thread (7) extending to engage with the first drive interface (6), and the other end extending to engage with the through groove (4).

6. The expansion interface screw according to claim 5, characterized in that: The elastic member (3) further comprises a protrusion (10) arranged on its inner wall, wherein the distance between the bottom end of the protrusion (10) and the central axis of the outer sleeve (2) is smaller than the radius of the core rod (1), and when the core rod (1) moves away from the end of the internal thread (7), it generates a thrust on the elastic member (3), causing the elastic member (3) to deform in a direction away from the central axis of the outer sleeve (2).

7. The expansion interface screw according to claim 6, characterized in that: The core rod (1) comprises a first rod segment (8) and a second rod segment (9), and the first rod segment (8) and the second rod segment (9) are connected together.

8. The expansion interface screw according to claim 7, characterized in that: The second rod section (9) can only be displaced below the internal thread (7).

9. The expansion interface screw according to claim 7, characterized in that: The first rod section (8) includes two external threads (11) arranged on its outer wall, the two external threads (11) meshing with the internal threads (7), and the core rod (1) and the outer sleeve (2) can be displaced by the two external threads (11).

10. The expansion interface screw according to claim 7, characterized in that: One end of the first rod segment (8) is provided with a second drive interface (12), and the second drive interface (12) is a straight groove provided at the end of the first rod segment (8) and is used to control the rotation of the core rod (1).

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