Supraankle osteotomy supporting body and supraankle osteotomy fixing device

Abstract

The utility model discloses a supraankle osteotomy supporting body and a supraankle osteotomy fixing device.The supraankle osteotomy supporting body is in a block shape and is provided with two first side faces, a far end, a near end and a longitudinal axis extending between the far end and the near end, the two first side faces are oppositely arranged and used for abutting against two osteotomy faces respectively, and the two first side faces are oppositely arranged and used for abutting against the two osteotomy faces respectively. A penetrating through groove is formed between the two first side faces, the near end is an implantation end, a through hole is formed in the end face of the far end, and the through hole is communicated with the through groove; the support body is made of a biological composite material based on citric acid. The supraankle osteotomy supporting body provided by the utility model can provide enough supporting force supplement for an osteotomy opening and ensure the stability of the osteotomy opening.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, and in particular relates to a supramalleolar osteotomy support body and a supramalleolar osteotomy fixation device. Background Art

[0002] The development of ankle osteoarthritis is associated with uneven pressure on the ankle joint surface and cartilage degeneration. Common surgical treatments include ankle fusion and ankle replacement. Ankle fusion can lead to loss of ankle joint mobility and accelerate degeneration of surrounding joints, while ankle replacement is expensive and has a short service life. In recent years, supramalleolar osteotomy has become increasingly popular. This procedure involves cutting bones to correct force alignment and improve stress distribution, thereby creating conditions for cartilage repair and ultimately treating ankle osteoarthritis.

[0003] Currently, supramalleotomy procedures typically use metal screws and metal plates as fixation devices to secure the osteotomy site, but this can lead to poor bone healing and the need for secondary removal. Conventional absorbable material fixation devices, such as bone screws and plates, have also been used to replace metal fixation devices, but these also suffer from a lack of elasticity, susceptibility to brittle fracture under pressure and torque, and the potential for damage to the osteotomy site and the supramalleotomy support, ultimately failing to provide secure fixation.

[0004] Therefore, providing a supramalleolar osteotomy support body and a fixation device that can provide sufficient elasticity and is made of absorbable material is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model provides a supramalleotomy support body, which can provide sufficient supporting force supplement to the osteotomy opening and ensure the stability of the osteotomy opening.

[0006] The utility model also provides a supramalleolar osteotomy fixation device, which provides overall support and fixation for the osteotomy site.

[0007] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0008] A supramalleotomy support body is block-shaped and has two first side surfaces, a distal end and a proximal end, and a longitudinal axis extending between the distal end and the proximal end. The two first side surfaces are arranged opposite to each other and are respectively used to support two osteotomy surfaces. A through groove is provided between the two first side surfaces. The proximal end is an implantation end. A through hole is provided on the distal end surface, and the through hole is connected to the through groove. The support body is made of a citric acid-based biocomposite material.

[0009] Furthermore, the two first side surfaces in the longitudinal axis direction gradually approach each other in a direction from the distal end to the proximal end.

[0010] Furthermore, the inner wall of the through hole is provided with threads.

[0011] Furthermore, the support body further includes two second side surfaces arranged relatively parallel to each other, and the second side surfaces are connected to the distal end via an arc transition.

[0012] Furthermore, the acute angle α between the planes where the two first side surfaces are located satisfies: 0﹤α≤60°.

[0013] Furthermore, the distance between the two second side surfaces is 7 to 20 mm.

[0014] Furthermore, the citric acid-based biocomposite material includes poly (glycol) citrate polymer and its derivatives and hydroxyapatite.

[0015] A supramalleotomy fixation device comprises a supramalleotomy support body, a bone plate, a bone screw and a fixing nail. A fixing hole is provided in the middle of the bone plate, and a plurality of locking holes are symmetrically provided on both sides. The fixing nail is passed through the fixing hole and the through hole, and the bone screw is passed through the locking hole.

[0016] Furthermore, the locking hole is a universal hole.

[0017] Furthermore, the bone plate, bone screws and fixing nails are made of metal materials or polymer absorbable materials.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a supramalleotomy support body, which is made of a biocomposite material based on citric acid, has a certain elasticity, and has a through groove in the middle, which can undergo a certain deformation under the action of extrusion, and provides sufficient mechanical support while not easily undergoing brittle fracture under the action of pressure and torsion, providing supplementary support force for the osteotomy opening, and moderate elasticity can avoid bone damage at the osteotomy position and damage to the supramalleotomy support body; at the same time, the present application also provides a supramalleotomy fixation device, which provides sufficient support and fixation to the osteotomy position, ensuring the stability of the operation; the supramalleotomy support body is made of a biocomposite material based on citric acid, which can not only be absorbed by the human body, but also avoid secondary surgery for removal; the porous structure of the supramalleotomy support body in the present invention is also conducive to the ingrowth of bone tissue. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall structural diagram of the support body of the utility model;

[0020] Figure 2 This is another structural diagram of the support body of the utility model;

[0021] Figure 3 It is a side view of the support body of the utility model;

[0022] Figure 4 This is an overall structural diagram of the supramalleolar osteotomy fixation device of the present invention in cooperation with the osteotomy site;

[0023] Figure 5 This is a structural diagram of the supramalleolar osteotomy fixation device of the present invention at another angle in coordination with the osteotomy site.

[0024] Reference numerals include:

[0025] 100 - support body 110 - proximal end 120 - distal end

[0026] 130 — second side surface 140 — first side surface 150 — through hole

[0027] 160 - through slot 200 - bone plate 210 - fixing hole

[0028] 220 - Locking hole 300 - Bone screw 400 - Fixing nail DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0033] The utility model provides a supramalleotomy support body, such as Figure 1 and Figure 2 As shown, it mainly includes a block-shaped support body 100, which includes two first side surfaces 140, two second side surfaces 130, a distal end 130 and a proximal end 110, and a longitudinal axis extending between the distal end 120 and the proximal end 110. The two first side surfaces 140 are arranged opposite to each other, and are respectively used to support the two osteotomy surfaces of the tibia. Some structures that increase resistance and prevent regression can be provided on the first side surfaces 140, such as barb-shaped ridges. A through groove 160 is provided between the two first side surfaces 140, and some autologous bones (osteotomy), artificial bones, bone growth factors and other materials that are conducive to bone growth and bone repair can be added into the through groove 160, which can be used for the growth and healing of bone tissue. In the direction of the longitudinal axis, the two first side surfaces 140 gradually approach each other from the distal end 130 to the proximal end 110, and the two first side surfaces 140 that are inclined relative to the longitudinal axis can fit more closely with the two inclined osteotomy surfaces (such as Figure 4 ), to better provide support for it. The two second side surfaces 130 are arranged relatively parallel, one end is connected to the proximal end 110, and the other end is connected to the distal end 120 in an arc transition. The proximal end 110 is the implantation end, and the end face of the distal end 120 is provided with a through hole 150, and the inner wall of the through hole 150 is provided with a thread. The support body 100 is made of a citric acid-based biocomposite material, which has a certain elasticity and is not prone to brittle fracture under pressure and torsion. It can provide sufficient support for the osteotomy and avoid bone damage at the osteotomy. In addition, with the design of the through groove 160, the support body 100 can bear the pressure through a certain deformation without being crushed when it is subjected to greater pressure.

[0034] As a preferred Figure 3 As shown, in the present application, the spacing between the two second side surfaces of the support body 100 is 7 to 20 mm, the distance between the proximal end surface 110 and the distal end surface 120 is 8 to 20 mm, and the acute angle α of the plane where the two first side surfaces 140 are located satisfies: 0﹤α≤60°. Different sizes can be selected according to the osteotomy requirements of different patients so that the support body 100 can fit better with the osteotomy surface and provide sufficient supporting force.

[0035] As implant in human body, usually it is subject to relatively large stretching or compressive force, therefore, as the material of implant, must possess enough tensile strength, elasticity and compression modulus to withstand this type of force.Through a series of simulations and tests, elastomer poly (glycol) citrate polymer and its derivative demonstrate huge potential in soft tissue engineering, it has controllable mechanical and degradation performance in a large range, and has good affinity and functionality to many cell types, and such polymer is all synthesized by simple and economical method by nontoxic monomer (citric acid).In the application, poly (glycol) citrate polymer and its derivative are formed into mixture with other materials (such as hydroxyapatite), form biocomposite material based on citric acid, this material has the excellent mechanical property of poly (glycol) citrate polymer and the biocompatibility of hydroxyapatite concurrently, make support body 100 can withstand enough pressure after implanting osteotomy opening, and can reduce the possibility of its crushing by elastic deformation, ensure the stability of osteotomy opening.

[0036] The present application also provides a supramalleolar osteotomy fixation device, such as Figure 4 and Figure 5 As shown, the bone plate 200 mainly includes a support body 100, a plurality of bone screws 300, and a fixing nail 400. The bone plate 200 is a long, symmetrical plate with a fixing hole 210 in the middle and multiple locking holes 220 symmetrically arranged on both sides. After the support body 100 is implanted in the osteotomy opening, the two first side surfaces 140 are aligned with the osteotomy surface, and the fixing holes 210 of the bone plate 200 are aligned with the support body 100. The fixing nail 400 is inserted through the fixing hole 210 into the through hole 150 of the support body 100 and matches its thread, fixing the support body 100 and the bone plate 200 together. The bone screw 300 is implanted into the corresponding bone tunnel through the locking hole 220, fixing the bone plate 200 to the bone tissue. Therefore, the bone plate 200 and the support body 100 work together to provide sufficient fixation and support for the osteotomy.

[0037] In the embodiments of the present application, the locking hole 220 can be configured as desired. The locking hole 220 is configured as a universal hole, meaning it allows the bone screw 300 to be implanted at a certain angle in all directions away from the axis. During surgery, the bone screw 300 can be implanted from multiple directions as needed, making the operation more convenient. Of course, in other embodiments, the locking hole 220 can also be configured as a tapered threaded hole that accommodates a fixed-direction bone screw 300.

[0038] The bone plate 200, bone screw 300, and fixation nail 400 of the supramalleolar osteotomy fixation device in this application can be made of metal or a polymeric absorbable material. The polymeric absorbable material can also be a citric acid-based biocomposite material primarily comprising poly(glycol) citrate polymers and their derivatives, and hydroxyapatite. Poly(glycol) citrate polymers and their derivatives include poly(1,8-octanediol-co-citric acid) and poly(1,6-hexanediol-co-citric acid).

[0039] During supramalleolar osteotomy, the distal tibia is osteotomized to correct the angle between the tibia and the medial malleolus of the distal tibia. Fixation is then performed. The correction creates a V-shaped opening between the upper and lower osteotomy surfaces, opening toward the medial side of the tibia. The support body 100 provided by the present invention is implanted into this opening for support and fixation.

[0040] The distal medial tibial plate 200 adjusts the force lines of the tibia and the distal medial malleolus respectively, thereby reducing joint pressure, slowing down or partially reversing the progression of arthritis, and can achieve a good bone setting effect when installed on the tibia cut during open distal tibial osteotomy. The plate 200 fits on the surface of the tibia, and the support body 100 fits on the inner surface of the bone setting opening (i.e., the osteotomy surface), achieving multi-directional fitting and fixation, which can better match the ankle joint and make the fixation more stable and reliable. The plate 200 is an integral plate-like structure with a simple structure. During surgery, the plate 200 is fitted to the bone surface and then tightened to complete the installation, which is easy to operate. The plate 200 is provided with a universal hole, and during surgery, fasteners can be implanted from multiple directions according to actual needs, making the operation more convenient. Furthermore, the support body 100 is provided to respectively support the two osteotomy surfaces of the tibia, and can also stretch the bone plate 200 and reduce the pressure on the distal end of the tibia, so that the mechanical properties of the support body 100 are more stable and the fixation is more stable and reliable.

[0041] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scope based on the concept of the present invention. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of the present invention.

Claims

1. A supramalleotomy support, characterized in that: The supramalleotomy support body (100) is block-shaped and has two first side surfaces (140), a distal end (120) and a proximal end (110), and a longitudinal axis extending between the distal end (120) and the proximal end (110), wherein the two first side surfaces (140) are arranged opposite to each other and are respectively used to support the two osteotomy surfaces, and a through groove (160) is provided between the two first side surfaces (140), the proximal end (110) is the implant end, and a through hole (150) is provided on the end face of the distal end (120), and the through hole (150) is connected to the through groove (160); the support body (100) is made of a citric acid-based biocomposite material.

2. The supramalleolar osteotomy support according to claim 1, characterized in that: The two first side surfaces (140) in the direction of the longitudinal axis gradually approach each other in a direction from the distal end (120) to the proximal end (110).

3. The supramalleolar osteotomy support according to claim 2, characterized in that: The inner wall of the through hole (150) is provided with threads.

4. The supramalleolar osteotomy support according to claim 3, characterized in that: The supramalleolar osteotomy support body (100) further comprises two second side surfaces (130) arranged relatively parallel to each other, and the second side surfaces (130) are connected to the distal end (120) via an arc transition.

5. The supramalleolar osteotomy support according to claim 4, characterized in that: The acute angle α between the planes where the two first side surfaces (140) are located satisfies the following condition: 0≤α≤60°.

6. The supramalleolar osteotomy support according to claim 5, characterized in that: The distance between the two second side surfaces (130) is 7 to 20 mm.

7. A supramalleolar osteotomy fixation device, characterized in that: The present invention comprises a supramalleolar osteotomy support body (100) as described in any one of claims 1 to 6, and further comprises a bone plate (200), a bone screw (300) and a fixing nail (400), wherein a fixing hole (210) is provided in the middle of the bone plate (200), and a plurality of locking holes (220) are symmetrically provided on both sides, the fixing nail (400) is passed through the fixing hole (210) and the through hole (150), and the bone screw (300) is passed through the locking hole (220).

8. The supramalleolar osteotomy fixation device according to claim 7, characterized in that: The locking hole (220) is a universal hole.

9. The supramalleolar osteotomy fixation device according to claim 8, characterized in that: The bone plate (200), bone screw (300) and fixing nail (400) are made of metal material or polymer absorbable material.

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