Distraction fusion cage with memory alloy structure

Abstract

The invention relates to the field of fusion devices, in particular to an expandable fusion device with a memory alloy structure, which comprises a fusion device main body, a memory alloy plate and a lifting adjusting component which are rotationally connected, and the memory alloy plate is arranged on the outer end surface of the fusion device main body; the two ends of the memory alloy plate are attached to the side end face of the fusion cage body in the cooling state, a sleeve is arranged in the fusion cage body, the lifting adjusting assembly comprises a limiting block, a driving rod, a turbine and a worm, the upper end and the lower end of the driving rod are arranged in the sleeve in a threaded fit mode, and the middle of the driving rod is sleeved with the limiting block. The limiting block is arranged on the end face of the sleeve in an up-down sliding mode, the turbine is fixedly arranged in the middle of the driving rod and located in the limiting block, and the worm is rotationally arranged in the limiting block and connected with the turbine in a meshed mode. By adjusting the distraction angle of the fusion cage, the fusion cage can be better fused with the spinal gap.

Description

Technical Field

[0001] The invention relates to the field of fusion devices, in particular to an expandable fusion device with a memory alloy structure. Background Art

[0002] For patients with congenital spinal diseases, degenerative diseases, benign and malignant tumors, spinal fractures, and thoracic, lumbar, and cervical intervertebral fusion problems, surgery is performed to implant a fusion device in the intervertebral disc or between vertebrae to form bony fusion between the vertebrae, thereby achieving the therapeutic effect. The minimally invasive spinal surgery methods that have emerged in the past decade have greatly shortened the surgical healing period and effectively reduced the surgical risks. Surgical treatment methods are divided into open internal fixation treatment and minimally invasive surgery methods. Among them, open internal fixation treatment causes large surgical incisions, a long recovery period, and patients experience more pain. The minimally invasive spinal surgery methods that have emerged in the past decade have greatly shortened the surgical healing period and effectively reduced the surgical risks; therefore, how to minimize the cross-sectional area of ​​the fusion device implant to reduce the surgical incision and increase the patient's recovery speed is a problem that needs to be solved at present.

[0003] The existing fusion devices have a single end face shape and cannot be adapted according to the intervertebral disc space of different races, populations, and segments (cervical, thoracic, and lumbar vertebrae). At the same time, the height and angle of the existing fusion devices are fixed, and the upper and lower fitting final plate area is small, which is not conducive to the patient's rapid recovery. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides an expandable fusion device with a memory alloy structure.

[0005] The objectives of the present invention can be achieved through the following technical solutions: An expandable fusion device with a memory alloy structure comprises: two groups of rotatably connected fusion device bodies, memory alloy plates and lifting and lowering adjustment components, wherein the memory alloy plates are arranged on the outer end surface of the fusion device body, and the two ends of the memory alloy plates are fitted on the side end surfaces of the fusion device body in a cooled state, and a threaded sleeve is arranged inside the fusion device body, and the lifting and lowering adjustment component comprises a limit block, a drive rod, a turbine and a worm, and the upper and lower ends of the drive rod are threadedly arranged in the sleeve, the middle part of the limit block is sleeved in the middle part of the drive rod, and the limit block is slidably arranged on the end surface of the sleeve, the turbine is fixedly arranged in the middle part of the drive rod and is located inside the limit block, and the worm is rotatably arranged in the limit block and meshed with the turbine.

[0006] As a further improvement, vertical sliding grooves are symmetrically arranged on the outer side of the sleeve, and guide sliding strips cooperating with the vertical sliding grooves are symmetrically arranged on the upper and lower sides of the limit block.

[0007] As a further improvement, the driving rod includes a screw rod portion, an internal thread groove is provided inside the sleeve, and the screw rod portion and the internal thread groove are cooperatively connected.

[0008] As a further improvement, the drive rod is provided with a limit groove 1 located on the upper and lower sides of the turbine, the limit block is provided with an inner cylinder limit groove 1 matching with the limit groove 1, the middle part of the worm is provided with a hexagonal groove, the outer end of the worm is provided with a limit groove 2, the limit block is provided with a worm accommodating groove, and the end of the worm accommodating groove is provided with an inner cylinder limit groove 2 matching with the limit groove 2.

[0009] As a further improvement, a buckle is provided on the end surface of the fusion device body, and a snap-fitting groove matching the buckle is provided at the lower end of the memory alloy plate, and the snap-fitting groove is used to assemble memory alloy plates of different specifications.

[0010] As a further improvement, two groups of buckles are symmetrically arranged on each group of the fusion device body, and the end faces of the buckles are semi-T-shaped cross-sections.

[0011] As a further improvement, the memory alloy bars on the upper and lower groups of the memory alloy plates are arranged alternately, and the memory alloy bars are provided with tooth-shaped memory alloy parts.

[0012] As a further improvement, the interior of the fusion device body is hollow, and the end surface of the fusion device body is provided with a through hole connected to the memory alloy plate.

[0013] Compared with the prior art, the expandable fusion device with a memory alloy structure of the present invention has the following beneficial effects:

[0014] 1. Choose the appropriate size of memory alloy plates according to the intervertebral space of different races, populations, and segments (cervical, thoracic, and lumbar vertebrae), and replace them flexibly, which significantly improves the matching degree and restores the physiological and anatomical morphology, bringing significant clinical significance;

[0015] 2. Through the use of memory alloy plates and fusion devices, the memory alloy plates are placed in cold water before surgery to deform on both sides, which is beneficial to reduce the implant volume of the fusion device, reduce the surgical wound and improve the patient's recovery speed; after the implantation position, the shape is restored and expanded, and the upper and lower end surfaces of the fusion device are further expanded to fit the end plate area, reducing the risk of settlement;

[0016] 3. The worm gear cooperates with the threaded connection structure of the drive rod and the sleeve to adjust the opening angle and height of the fusion device, so that the fusion device and the spinal space can be better integrated. At the same time, the adjustment of the worm gear has self-locking property to ensure the stability of the fusion device opening.

[0017] 4. After inserting the memory alloy plate, the final plate area is further enlarged to reduce the risk of settlement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the present invention

[0019] Figure 2 The structural schematic diagram of the closed state of the present invention

[0020] Figure 3 A schematic diagram of the internal structure of the present invention

[0021] Figure 4 This is a structural diagram of a local position of the lifting and adjusting component in the present invention.

[0022] Figure 5 This is a structural diagram of the local position 2 of the lifting and adjusting component in the present invention.

[0023] Figure 6 The schematic diagram of the structure of the memory alloy plate in the present invention is as follows:

[0024] In the figure, 1-fusion device body, 11-sleeve, 111-vertical slide groove, 12-internal thread groove, 13-buckle, 2-memory alloy plate, 21-clamping groove, 22-memory alloy strip, 23-toothed memory alloy part, 3-lifting adjustment component, 31-limiting block, 311-inner cylinder limiting groove one, 312-worm accommodating groove, 313-inner cylinder limiting groove two, 32-driving rod, 33-turbine, 34-worm, 341-inner hexagonal groove, 342-limiting groove two, 35-screw part, 36-limiting groove one, 37-guide slide bar, 4-through hole. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Below is a combination of the embodiments and the attached Figures 1 to 6 , the technical solution of the present invention is further elaborated.

[0028] Example 1

[0029] A expandable fusion device with a memory alloy structure comprises: two groups of rotatably connected fusion device bodies 1, memory alloy plates 2 and a lifting and adjusting assembly 3, wherein the memory alloy plates 2 are arranged on the outer end surface of the fusion device body 1, and both ends of the memory alloy plates 2 are fitted on the side end surfaces of the fusion device body 1 in a cooled state, and a threaded sleeve 11 is provided inside the fusion device body 1, and the lifting and adjusting assembly 3 comprises a limit block 31, a drive rod 32, a turbine 33 and a worm 34, and the upper and lower ends of the drive rod 32 are threadedly arranged in the sleeve 11, the middle part of the limit block 31 is sleeved in the middle part of the drive rod 32, and the limit block 31 is slidably arranged on the end surface of the sleeve 11 up and down, the turbine 33 is fixedly arranged in the middle part of the drive rod 32 and is located inside the limit block 31, and the worm 34 is rotatably arranged in the limit block 31 and meshed with the turbine 33.

[0030] like Figure 1 to Figure 6 As shown, the use principle of the present invention is as follows: the rear end sides of the upper and lower parts of the fusion device body 1 are connected and matched by pins, and are placed in ice water before surgery to produce deformation. The two ends of the upper and lower memory alloy plates 2 are fitted and arranged on the side end faces of the fusion device body 1, which is conducive to reducing the implant volume of the fusion device. After implantation between the vertebrae, the temperature is restored, and the shapes of the upper and lower memory alloy plates 2 are restored; the worm 34 in the rotating limit block 31 can be used to drive the turbine 33 to rotate, and the rotation of the turbine 33 drives the driving rod 32 to rotate. Since the upper and lower ends of the driving rod 32 are threadedly connected to the sleeve 11, and the limit block 31 is slidably arranged on the end face of the sleeve 11, the height of the sleeve 11 on the driving rod 32 can be adjusted, and finally the height of the fusion device body 1 can be adjusted to achieve expansion.

[0031] The memory alloy plate 2 is used in conjunction with the fusion device and is folded in cold water before surgery, which is beneficial to reducing the implant volume of the fusion device, reducing the surgical wound and improving the patient's recovery speed; the shape is restored and expanded after implantation to achieve sufficient mechanical stability and a better biological bone grafting fusion environment; the fusion device expansion angle is adjusted by the threaded connection of the turbine worm gear and the drive rod and the sleeve, so that the fusion device and the spinal space can be better integrated, and the adjustment of the turbine worm gear is self-locking, which ensures the stability of the fusion device expansion.

[0032] As a further preferred embodiment, a vertical sliding groove 111 is symmetrically arranged on the outer side of the sleeve 11 , and a guide sliding strip 37 cooperating with the vertical sliding groove 111 is symmetrically arranged on the upper and lower sides of the limit block 31 .

[0033] like Figure 4 As shown, the guide slide bar 37 cooperates with the vertical slide groove 111 to limit the rotation of the limit block 31.

[0034] As a further preferred embodiment, the driving rod 32 includes a screw rod portion 35 , an internal thread groove 12 is provided inside the sleeve 11 , and the screw rod portion 35 and the internal thread groove 12 are cooperatively connected.

[0035] As a further preferred embodiment, the driving rod 32 is provided with a limit groove 36 located on the upper and lower sides of the turbine 33, the limit block 31 is provided with an inner cylinder limit groove 311 cooperating with the limit groove 36, the middle part of the worm 34 is provided with a hexagonal groove 341, the outer end of the worm 34 is provided with a limit groove 2 342, the limit block 31 is provided with a worm accommodating groove 312, and the end of the worm accommodating groove 312 is provided with an inner cylinder limit groove 2 313 cooperating with the limit groove 2 342.

[0036] like Figure 4 and Figure 5 As shown, the inner cylinder limit groove 1 311 of the limit block 31 cooperates with the limit groove 1 36 of the driving rod 32, which can constrain the vertical and horizontal freedom of the limit block 31 and allow the driving rod 32 to rotate; the inner cylinder limit groove 2 313 of the limit block 31 cooperates with the limit groove 2 342 of the worm 34, which can constrain the vertical and horizontal freedom of the limit block 31 and allow the worm 34 to be rotated and adjusted, and the hexagonal groove 341 facilitates the adjustment of the rotation of the worm 34, so that the turbine 33 matched with the worm 34 rotates.

[0037] As a further preferred embodiment, a buckle 13 is provided on the end surface of the fusion device body 1, and a snap groove 21 matching the buckle 13 is provided at the lower end of the memory alloy plate 2, and the snap groove 21 is used to assemble memory alloy plates 2 of different specifications.

[0038] like Figure 6 As shown, the buckle 13 of the fusion device body 1 allows the memory alloy plate 2 to be inserted and slidably fitted along the snap-in groove 21. The memory alloy plate has different widths and surface conditions and different models and specifications, and is easy to replace.

[0039] As a further preferred embodiment, two groups of buckles 13 are symmetrically arranged on each group of the fusion device body 1, and the end surface of the buckle 13 is a semi-T-shaped cross section. The buckle 13 with a semi-T-shaped cross section can be replaced with memory alloy plates 2 of different widths according to needs.

[0040] As a further preferred embodiment, the memory alloy strips 22 on the memory alloy plate 2 are arranged in a staggered manner, and the memory alloy strips 22 are provided with tooth-shaped memory alloy portions 23 .

[0041] like Figure 2As shown, in the cooling state, the memory alloy strips 22 on the memory alloy plates 2 are fitted at both ends of the fusion device body 1, and the memory alloy strips 22 on the upper and lower groups of memory alloy plates 2 are staggered and mutually staggered, which is beneficial to reduce the insertion width; the tooth-shaped memory alloy parts 23 arranged at intervals are beneficial to implantation between vertebrae and prevent sliding.

[0042] As a further preferred embodiment, the fusion device body 1 is hollow inside, and the end face of the fusion device body 1 is provided with a through hole 4 connected to the memory alloy plate 2, and a blood supply hole is provided through the through hole 5 to promote bone growth and improve the fusion effect.

[0043] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A expandable fusion device with a memory alloy structure. It is characterized in that include: Two groups of rotatably connected fusion device bodies, memory alloy plates and lifting and lowering adjustment components, the memory alloy plate is arranged on the outer end surface of the fusion device body, and the two ends of the memory alloy plate are fitted on the side end surfaces of the fusion device body in a cooled state. A threaded sleeve is provided inside the fusion device body, and the lifting and lowering adjustment component includes a limit block, a drive rod, a turbine and a worm. The upper and lower ends of the drive rod are threadedly arranged in the sleeve, the middle part of the limit block is sleeved in the middle part of the drive rod, the limit block is slidably arranged on the end surface of the sleeve up and down, the turbine is fixedly arranged in the middle part of the drive rod and is located inside the limit block, and the worm is rotatably arranged in the limit block and meshed with the turbine.

2. The expandable fusion device with a memory alloy structure according to claim 1, It is characterized in that The outer side of the sleeve is symmetrically provided with vertical sliding grooves, and the limit block is symmetrically provided with guide sliding strips matched with the vertical sliding grooves up and down.

3. The expandable fusion device with a memory alloy structure according to claim 1, It is characterized in that The driving rod comprises a screw rod portion, an internal thread groove is arranged inside the sleeve, and the screw rod portion and the internal thread groove are matched and connected.

4. The expandable fusion device with a memory alloy structure according to claim 1, It is characterized in that The driving rod is provided with a limiting groove 1 located on the upper and lower sides of the turbine, the limiting block is provided with an inner cylinder limiting groove 1 matched with the limiting groove 1, the middle part of the worm is provided with an inner hexagonal groove, the outer end of the worm is provided with a limiting groove 2, the limiting block is provided with a worm accommodating groove, and the end of the worm accommodating groove is provided with an inner cylinder limiting groove 2 matched with the limiting groove 2.

5. The expandable fusion device with a memory alloy structure according to claim 1, It is characterized in that A buckle is provided on the end surface of the fusion device body, and a clamping groove matching the buckle is provided at the lower end of the memory alloy plate, and the clamping groove is used to assemble memory alloy plates of different specifications.

6. The expandable fusion device with a memory alloy structure according to claim 5, It is characterized in that There are two groups of buckles on each group of the fusion device body symmetrically arranged, and the end surface of the buckle is a semi-T-shaped cross-section.

7. The expandable fusion device with a memory alloy structure according to claim 5, It is characterized in that The memory alloy bars on the upper and lower groups of memory alloy plates are arranged alternately, and tooth-shaped memory alloy parts are provided on the memory alloy bars.

8. The expandable fusion device with a memory alloy structure according to claim 1, Features The interior of the fusion device body is hollow, and the end surface of the fusion device body is provided with a through hole connected to the memory alloy plate.

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