Spherical mesh 4D memory alloy femoral head support device

Abstract

The present invention discloses a spherical mesh 4D memory alloy femoral head support device, comprising a spherical mesh 4D memory alloy femoral head support body and a minimally invasive implantation device; the spherical mesh 4D memory alloy femoral head support body comprises a mesh spherical surface, the mesh spherical surface is composed of crossed metal wires, and the metal wires are memory alloys; the minimally invasive implantation device comprises a sleeve, and the sleeve is provided with a pushing mechanism for pushing the spherical mesh 4D memory alloy femoral head support body to move along the axial direction of the sleeve; the inner diameter of the sleeve is greater than the diameter of the mesh spherical surface in a compressed state. The spherical mesh 4D memory alloy femoral head support body can provide uniform circumferential expansion support while providing axial support; the minimally invasive implantation device is used to implant the spherical mesh 4D memory alloy femoral head support body, and is easy to install and reliable.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a spherical mesh 4D memory alloy femoral head supporting device. Background Art

[0002] Avascular necrosis of the femoral head is a common and frequently occurring disease in orthopedics. The destruction of blood supply to the femoral head caused by various reasons can cause the death of active components of the femoral head. In the process of the body repairing the bone necrotic area, the early necrotic trabeculae are mainly absorbed, making the collapsed area more fragile.

[0003] One of the existing treatment methods is to use a support device to support the wound. The existing support devices are all rod-shaped or umbrella-shaped, and can usually provide axial or local support.

[0004] For example, the patent application (application number: 201710971095.5) discloses a hollow titanium rod with a fixing device for supporting the femoral head to prevent collapse, including a rod body and a fixing device. The rod body is integrally formed, and the rod body is an octagonal prism. The outer surface of the rod body has a hydroxyapatite coating. The rod body is provided with a through hole along its axial direction. The tail of the rod body is provided with a coarse thread. The tail end of the rod body has a hexagonal notch, and the hexagonal notch is interconnected with the through hole. The fixing device is connected to the tail end of the rod body. The femoral head supporting titanium rod of the present invention is implanted into the collapsed part of the femoral head to play a mechanical supporting role, thereby improving the biomechanical properties of the femoral head and neck and preventing the collapse of the femoral head. The femoral head supporting titanium rod is designed as a hollow structure, which can play a long-term role in decompressing the femoral head. The hydroxyapatite coating on the outer surface of the titanium rod has good compatibility with human tissue. The tail end of the titanium rod is provided with a fixing device, which effectively prevents the titanium rod from loosening and slipping.

[0005] For example, a patent application (application number: 201110161085.8) discloses a nickel-titanium memory alloy umbrella-titanium cage femoral head internal support device, which is composed of a nickel-titanium memory alloy umbrella, a TA2 pure titanium support body, and a TA2 pure titanium tail fastening screw. It can accommodate bone materials or production factors and can automatically increase the support area after implantation.

[0006] For another example, a patent application (application number: 201020641438.5) discloses an umbrella-shaped memory alloy femoral head supporter, which is composed of 8 supporting ribs.

[0007] You may also refer to the following patents (publication numbers: CN102824208A; CN201912208U).

[0008] The design of the support device in the above patent applications is insufficient. Due to the unreasonable design and size, the support function is limited to a small part, and the axial direction is the main support direction, which cannot provide overall expansion support. Although some patents use memory alloys to achieve the purpose of minimally invasive treatment, due to the strength of nickel-titanium alloy and the shape and size problems, it cannot provide long-term and effective support. Related clinical studies have also confirmed this. Summary of the invention

[0009] The present invention aims to provide a spherical mesh 4D memory alloy femoral head support device, comprising a spherical mesh 4D memory alloy femoral head support body and a minimally invasive implantation device. The spherical mesh 4D memory alloy femoral head support body can provide uniform circumferential expansion support while providing axial support; the minimally invasive implantation device is used to implant the spherical mesh 4D memory alloy femoral head support body, which is easy and reliable to install.

[0010] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0011] The present invention discloses a spherical mesh 4D memory alloy femoral head support device, comprising a spherical mesh 4D memory alloy femoral head support body and a minimally invasive implant device; the spherical mesh 4D memory alloy femoral head support body comprises a mesh spherical surface, the mesh spherical surface is composed of crossed metal wires, and the metal wires are memory alloys; the minimally invasive implant device comprises a sleeve, and the sleeve is provided with a pushing mechanism for pushing the spherical mesh 4D memory alloy femoral head support body to move axially along the sleeve; the inner diameter of the sleeve is larger than the diameter of the mesh spherical surface in a compressed state.

[0012] Preferably, the memory alloy is nickel-titanium alloy.

[0013] Furthermore, the metal wires include metal wires of at least two diameters.

[0014] Preferably, there are two types of metal wires, namely thin metal wires and thick metal wires. The diameter of the thin metal wires is 200-300 μm, the diameter of the thick metal wires is 1000-1200 μm, and the number ratio of the thin metal wires to the thick metal wires is 8:2 to 3:7.

[0015] Furthermore, a water cooling structure is provided in the side wall of the sleeve, and a water inlet and a water outlet of the water cooling structure are both located at the lower part of the sleeve.

[0016] Preferably, the pushing mechanism includes a sliding block, a screw rod, and a cap body. The sliding block is axially slidably matched with the inner wall of the sleeve. The upper end of the sliding block is an arc surface, and the curvature of the arc surface is greater than the curvature of the mesh spherical surface. The lower end of the sliding block is provided with a pit, and the front end of the screw rod is adapted to the pit. The cap body is threadedly connected to the lower end of the sleeve, and a threaded through hole A is provided in the center of the cap body, and the screw rod is threadedly matched with the threaded through hole A; an axial guide groove is provided on the inner wall of the sleeve, and the axial guide groove passes through the lower end of the sleeve, and the axial guide groove does not pass through the upper end of the sleeve, and the side wall of the sliding block is provided with a guide ridge adapted to the axial guide groove.

[0017] Furthermore, the pushing mechanism also includes a guide block, which is sleeved in the sleeve, a threaded through hole B is provided in the center of the guide block, the screw rod is threadedly matched with the threaded through hole B, and an anti-rotation protrusion adapted to the axial guide groove is provided on the outer wall of the guide block.

[0018] Furthermore, a locking mechanism is provided between the cap body and the sleeve, and the locking mechanism is a buckle.

[0019] Preferably, the water cooling structure includes an interlayer located in the side wall of the sleeve, an axial partition is provided in the interlayer, the axial partition divides the lower part of the interlayer into a water inlet area and a water outlet area, the water inlet is located in the water inlet area, the water outlet is located in the water outlet area, and the top of the interlayer is connected.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The spherical mesh 4D memory alloy femoral head support is a spherical surface, which can provide uniform circumferential expansion support while providing axial support.

[0022] 2. The spherical mesh 4D memory alloy femoral head support is mesh-shaped, and has good osteoconductivity and osteoinductivity.

[0023] 3. The spherical mesh 4D memory alloy femoral head support is made of nickel-titanium alloy with good biocompatibility.

[0024] 4. The spherical mesh 4D memory alloy femoral head support body combines two kinds of thick and thin metal wires, which not only ensures sufficient support strength, but also improves the bone conductivity of the support body.

[0025] 5. Minimally invasive implantation tools can conveniently and safely implant the spherical mesh 4D memory alloy femoral head support device.

[0026] 6. The minimally invasive implantation tool includes a water cooling mechanism, which can ensure that the spherical mesh 4D memory alloy femoral head support device remains in a compressed state during the implantation process.

[0027] 7. The minimally invasive implantation tool is equipped with a guiding mechanism, an anti-rotation mechanism and a locking mechanism, which can further ensure the operational stability of the implantation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the spherical mesh 4D memory alloy femoral head support body in the recovery state;

[0029] Figure 2 It is a partial enlarged view of the surface of the spherical mesh 4D memory alloy femoral head support body;

[0030] Figure 3 It is a schematic diagram of the structure of a minimally invasive implantation tool;

[0031] Figure 4 It is a partial development diagram of the inner wall of the sleeve;

[0032] Figure 5 is a radial cross-sectional view of the sleeve;

[0033] Figure 6 is an axial cross-sectional view of the sleeve;

[0034] In the figure: 1-mesh spherical surface, 11-thick metal wire, 12-thin metal wire, 2-sleeve, 21-sleeve external thread, 22-water inlet, 23-water outlet, 24-interlayer, 25-axial partition, 26-axial guide groove, 3-sliding block, 31-arc surface, 32-pit, 33-guide convex ridge, 4-screw, 41-screw external thread, 42-nut, 5-guide block, 51-internal thread of threaded through hole B, 52-anti-rotation convex ridge, 6-cap body, 61-cap body internal thread, 62-groove, 63-internal thread of threaded through hole A 63, 7-card strip, 71-protrusion. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] The spherical mesh 4D memory alloy femoral head support device disclosed by the invention comprises a spherical mesh 4D memory alloy femoral head support body and a minimally invasive implantation tool.

[0037] like Figure 1 , Figure 2 As shown, the spherical mesh 4D memory alloy femoral head support body is a mesh spherical surface 1, which is composed of crossed metal wires. The metal wires are memory alloys, and the memory alloy is preferably nickel-titanium alloy.

[0038] The metal wires include metal wires of at least two diameters. In this embodiment, there are two types of metal wires, namely thin metal wires 12 and thick metal wires 11. The diameter of the thin metal wires 12 is 200-300 μm, the diameter of the thick metal wires 11 is 1000-1200 μm, and the number ratio of the thin metal wires 11 to the thick metal wires 12 is 8:2 to 3:7.

[0039] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the minimally invasive implantation tool includes a sleeve 2, and the sleeve 2 is provided with a pushing mechanism for pushing the spherical mesh 4D memory alloy femoral head support body to move axially along the sleeve 2; the inner diameter of the sleeve 2 is larger than the diameter of the mesh spherical surface 1 in the compression state; the pushing mechanism includes a sliding block 3, a screw rod 4, and a cap body 6, the sliding block 3 is axially slidably matched with the inner wall of the sleeve 2, the upper end of the sliding block is an arc surface 31, the curvature of the arc surface 31 is larger than the curvature of the mesh spherical surface 1, the lower end of the sliding block 3 is provided with a pit 32, the front end of the screw rod 4 is adapted to the pit 32, and the cap body 6 is threadedly connected to the lower end of the sleeve 2. Specifically, the cap body 6 is provided with a cap body internal thread 61, and the lower end of the sleeve 2 is provided with a sleeve external thread 21; a threaded through hole A is provided in the center of the cap body 6, and the screw 4 is threadedly matched with the threaded through hole A. Specifically, the screw external thread 41 of the screw 4 is matched with the internal thread 63 of the threaded through hole A; an axial guide groove 26 is provided on the inner wall of the sleeve 2, and the axial guide groove 26 passes through the lower end of the sleeve 2, and the axial guide groove 26 does not pass through the upper end of the sleeve 2, and the side wall of the sliding block 3 is provided with a guide convex ridge 33 adapted to the axial guide groove 26.

[0040] The pushing mechanism also includes a guide block 5, which is sleeved in the sleeve 2. A threaded through hole B is provided in the center of the guide block 5, and the screw is threadedly matched with the threaded through hole B. Specifically, the external screw thread 41 of the screw 4 is matched with the internal thread 51 of the threaded through hole B, and the outer wall of the guide block 5 is provided with an anti-rotation protrusion 52 adapted to the axial guide groove 26.

[0041] Of course, there can be multiple axial guide grooves 26, guide ridges 33, and anti-rotation ridges 52.

[0042] A locking mechanism is provided between the cap body and the sleeve, and the locking mechanism is a buckle; specifically, the buckle includes a clamping strip 7 movably connected to the sleeve 2, the clamping strip 7 is provided with a protrusion 71, and the cap body 6 is provided with a groove 62, and the protrusion 71 is engaged with the groove 62.

[0043] A water cooling structure is provided inside the side wall of the sleeve 2, and a water inlet 22 and a water outlet 23 of the water cooling structure are both located at the lower part of the sleeve 2. The water cooling structure also includes an interlayer 24 located inside the side wall of the sleeve 2, and an axial partition 25 is provided inside the interlayer 24. The axial partition 25 divides the lower part of the interlayer 24 into a water inlet area and a water outlet area. The water inlet 22 is located in the water inlet area, and the water outlet 23 is located in the water outlet area, and the top of the interlayer 24 is connected.

[0044] The method of using the present invention is as follows: cold water is passed through the sleeve 2, and the mesh spherical surface 1 and 3-sliding blocks in a compressed state are placed in the sleeve 2 in turn. The screw 4 passes through the cap body 6 and the guide block 5 in turn and is inserted into the sleeve 2. The cap body 6 is tightened and sleeved on the sleeve 2, and then the front end of the screw 4 is inserted into the pit 32 by twisting the nut 42 of the screw 4, and the sleeve is inserted into the installation position. The nut 42 is further twisted to push the mesh spherical surface 1 to the installation position.

[0045] To prevent the cap body 6 from loosening, the cap body 6 can also be locked on the sleeve 2 by means of a buckle 7 .

[0046] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. Spherical mesh 4D memory alloy femoral head support device, characterized by: It includes a spherical mesh 4D memory alloy femoral head support and a minimally invasive implant device; The spherical mesh 4D memory alloy femoral head support body includes a mesh spherical surface, the mesh spherical surface is composed of crossed metal wires, the metal wires are memory alloys, and the metal wires include metal wires of at least two diameters; the minimally invasive implant device includes a sleeve, and the sleeve is provided with a pushing mechanism for pushing the spherical mesh 4D memory alloy femoral head support body to move along the axial direction of the sleeve; the inner diameter of the sleeve is larger than the diameter of the mesh spherical surface in a compressed state; The side wall of the sleeve is provided with a water-cooling structure, and the water inlet and outlet of the water-cooling structure are both located at the lower part of the sleeve; the pushing mechanism comprises a sliding block, a screw and a cap body, the sliding block is axially slidably matched with the inner wall of the sleeve, the upper end of the sliding block is an arc surface, the curvature of the arc surface is greater than the curvature of the mesh spherical surface, the lower end of the sliding block is provided with a pit, the front end of the screw is adapted to the pit, the cap body is threadedly connected to the lower end of the sleeve, a threaded through hole A is provided at the center of the cap body, and the screw is threadedly matched with the threaded through hole A; the inner wall of the sleeve is provided with an axial guide groove, the axial guide groove passes through the lower end of the sleeve, the axial guide groove does not pass through the upper end of the sleeve, and the side wall of the sliding block is provided with a guide convex ridge matched with the axial guide groove; the pushing mechanism also comprises a guide block, the guide block is sleeved in the sleeve, the center of the guide block is provided with a threaded through hole B, the screw is threadedly matched with the threaded through hole B, and the outer wall of the guide block is provided with an anti-rotation convex ridge matched with the axial guide groove; The water cooling structure includes an interlayer located in the side wall of the sleeve, an axial partition is provided in the interlayer, and the axial partition divides the lower part of the interlayer into a water inlet area and a water outlet area. The water inlet is located in the water inlet area, the water outlet is located in the water outlet area, and the top of the interlayer is connected.

2. The spherical mesh 4D memory alloy femoral head support device according to claim 1, characterized in that: The memory alloy is nickel-titanium alloy.

3. The spherical mesh 4D memory alloy femoral head support device according to claim 1, characterized in that: There are two types of metal wires, namely thin metal wires and thick metal wires. The diameter of the thin metal wires is 200-300 μm, the diameter of the thick metal wires is 1000-1200 μm, and the quantity ratio of the thin metal wires to the thick metal wires is 8:2 to 3:

7.

4. The spherical mesh 4D memory alloy femoral head support device according to claim 1, characterized in that: A locking mechanism is provided between the cap body and the sleeve, and the locking mechanism is a buckle.

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