Elastic fusion cage

Abstract

The utility model discloses an elastic fusion cage and relates to the field of medical instruments, the elastic fusion cage comprises an elastic middle body, wedge-shaped clamping grooves are formed in the upper end and the lower end of the middle body, an upper end body is riveted to the upper end of the middle body and located in the wedge-shaped clamping grooves, and a lower end body is riveted to the lower end of the middle body and located in the wedge-shaped clamping grooves. The opposite sides of the upper end body and the lower end body are each provided with a bone grafting bin used for being fused with an adjacent vertebral body, and bolts are arranged between the upper end body and the middle body and between the lower end body and the middle body in an inserted mode. The fusion cage is matched with bone growth to fix the position, elasticity is achieved, the vertebra distraction effect is guaranteed, the upper end body and the lower end body of the middle body are hard, the middle body is elastic, and an elastic activity space is provided for growth of bone tissue in a bone grafting bin.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a elastic fusion cage. BACKGROUND

[0002] After the nucleus pulposus, annulus fibrosus and cartilage plate of the lumbar intervertebral disc, especially the nucleus pulposus, have different degrees of degenerative changes, under the action of external force factors, the annulus fibrosus of the intervertebral disc is ruptured, and the nucleus pulposus tissue is protruded or prolapsed from the ruptured part to the rear or the spinal canal, causing bone and ligament compensation hyperplasia, intervertebral space narrowing and other pathological changes, which seriously affects the work and life of patients. Lumbar fusion is one of the effective methods for treating lower lumbar instability and lumbar spondylolisthesis, which can restore the physiological curvature of the spine and reconstruct the stability of the lumbar spine, but with the popularization and application of this technology, the existing intervertebral fusion cage products have exposed more and more application defects.

[0003] For example, in application No. CN201520781483.3, an elastic posterior lumbar interbody fusion cage, in actual use, still has the following shortcomings:

[0004] The device is placed between the intervertebral space of the patient's vertebrae, and the teeth surfaces at the upper and lower ends of the fusion cage are fixed with the vertebrae, and an elastic groove is formed in the fusion cage, but as the human vertebrae recover, the fusion cage body is subjected to extrusion from both the upper and lower ends, so that the fusion cage extrudes the elastic groove to deform, thereby losing the resilience, and the expansion effect cannot be effectively guaranteed, and the growth of bone tissue will cause the fusion cage to deviate, thereby affecting the recovery effect. Utility model content

[0005] In order to improve the poor fixation effect of the conventional fusion cage, which cannot maintain elasticity and thus cannot effectively expand the vertebrae, the present application provides an elastic fusion cage.

[0006] The elastic fusion cage provided by the present application adopts the following technical scheme:

[0007] An elastic fusion cage, comprising an intermediate body with elasticity, a wedge-shaped clamping groove is formed at the upper and lower ends of the intermediate body, an upper end body is riveted in the wedge-shaped clamping groove at the upper end of the intermediate body, a lower end body is riveted in the wedge-shaped clamping groove at the lower end of the intermediate body, a bone grafting chamber for fusion with adjacent vertebral bodies is formed at the opposite side of the upper end body and the lower end body, and a plug is inserted between the upper end body and the intermediate body and between the lower end body and the intermediate body.

[0008] By adopting the technical scheme, the two pins connect the upper end body, the lower end body and the middle body to form overall transverse fixation, and the wedge riveting of the upper end body, the lower end body and the middle body forms longitudinal fixation, so that the interbody fusion cage has good stability, thereby ensuring the distraction effect, and the elastic middle body is connected with the upper end body and the lower end body to provide an elastic movement space after the implant and the vertebral body are fused.

[0009] Preferably, the upper end body and the lower end body are each fixed with a wedge-shaped protrusion on the opposite side.

[0010] By adopting the technical scheme, the wedge-shaped protrusion is inserted into the wedge-shaped clamping groove, so that the middle body, the upper end body and the lower end body are longitudinally fixed as a whole to effectively prevent sliding.

[0011] Preferably, the upper end body and the lower end body are each provided with an abutting surface around the bone graft bin on the opposite side, and the two abutting surfaces are each in abutment with the adjacent vertebral body.

[0012] By adopting the technical scheme, the abutting surface is provided with multiple teeth, and when the upper end body and the lower end body are in abutment with the vertebrae, the abutting surface increases the friction force of contact to improve the installation stability.

[0013] Preferably, an auxiliary groove for increasing bone growth space is formed on the surface of the lower end body at the position of the abutting surface.

[0014] By adopting the technical scheme, the vertebrae are in contact with the abutting surface, so that the bone tissue of the vertebrae grows from the auxiliary groove into the bone graft bin, thereby providing more space for the growth of the bone tissue.

[0015] Preferably, a pin hole is formed through the surface of the upper end body and the lower end body at the abutting surface, and a fixing hole is formed on the upper end and the lower end of the middle body at the position of the pin hole.

[0016] By adopting the technical scheme, the pin hole and the fixing hole are provided for the subsequent insertion of the pins to reserve a fixing space and maintain the fixing effect.

[0017] Preferably, the two pins are inserted into the two pin holes and the two fixing holes, respectively.

[0018] By adopting the technical scheme, the pins are inserted into the pin holes and the fixing holes, respectively, so that the middle body, the upper end body and the lower end body are transversely fixed as a whole.

[0019] Preferably, a threaded opening is formed on one side of the outer surface of the middle body, and a mechanical clamp is connected to the threaded opening for holding the interbody fusion cage.

[0020] By adopting the technical scheme, the threaded opening is fixed with the external mechanical clamp, and personnel can take the intermediate body through the mechanical clamp, thereby assisting in the unfolding of the operation.

[0021] Preferably, the width of the intermediate body on the side close to the threaded opening is greater than the width on the side away from the threaded opening.

[0022] By adopting the technical scheme, the width of the front end of the intermediate body is greater than the width of the rear end, so that the overall shape fits the shape of the vertebra, and the recovery growth of the vertebra after the installation of the fusion cage is facilitated.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. Two pins are inserted into the insertion hole and the fixing hole respectively to form a transverse fixation, and the wedge-shaped protrusion is inserted into the wedge-shaped clamping groove to form a longitudinal fixation, so that the intermediate body, the upper end body and the lower end body are fixed as a whole, and the intermediate body has a certain elasticity, which not only ensures the distraction effect of the fusion cage, but also allows the vertebra to have elastic movement.

[0025] 2. Two abutting surfaces abut against adjacent vertebrae, thereby increasing the stability of the fusion cage, and the bone grafting bin abuts against the vertebrae, and when the vertebrae grow, the bone grafting bin is fixed, providing growth space for the recovery of bone tissue, and preventing the fusion cage from slipping. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective view of the present application;

[0027] Figure 2 is a perspective view of the present application;

[0028] Figure 3 is a perspective view of the present application;

[0029] Figure 4 is a perspective view of the present application.

[0030] Reference signs: 1, intermediate body; 2, upper end body; 3, lower end body; 4, abutting surface; 5, bone grafting bin; 6, auxiliary groove; 7, wedge-shaped protrusion; 8, wedge-shaped clamping groove; 9, pin hole; 10, fixing hole; 11, pin; 12, threaded opening. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying Figures 1-4 The present application will be further described in detail.

[0032] The present application discloses an elastic fusion cage.

[0033] The "up, down, left and right" perspective of the present device is based on the Figure 4 The direction of the drawing is the reference

[0034] Refer to Figure 1 , Figure 3 , Figure 4 The elastic fusion cage comprises a middle body 1, the front end of the outer surface of the middle body 1 is wider than the rear end, so that the shape of the middle body 1 approaches the outer surface of the vertebra, the middle body 1 is made of a composite polylactic acid material, has a certain elasticity and can be degraded and absorbed by the human body, wedge-shaped clamping grooves 8 are formed in the upper and lower ends of the middle body 1, and wedge-shaped protrusions 7 are riveted in the two wedge-shaped clamping grooves 8, upper end bodies 2 and lower end bodies 3 are fixedly arranged at the ends of the wedge-shaped protrusions 7 away from the middle body 1, and the shapes of the upper end bodies 2 and the lower end bodies 3 are consistent with that of the middle body 1.

[0035] It should be noted that a threaded hole 12 is formed in the middle of the wider side of the outer surface of the middle body 1, and the threaded hole 12 is fixedly connected with an external mechanical clamp or the like, and personnel move the middle body 1 by means of the mechanical clamp, so as to facilitate holding and taking the whole fusion cage.

[0036] The two wedge-shaped protrusions 7 are transversely inserted into the wedge-shaped clamping grooves 8, and the wedge-shaped protrusions 7 and the wedge-shaped clamping grooves 8 form a T shape as a whole, so that the upper end bodies 2 and the lower end bodies 3 are connected with the middle body 1 as a whole, forming longitudinal fixation, and the upper end bodies 2 and the lower end bodies 3 are made of titanium metal material, having good fatigue resistance, corrosion resistance and biocompatibility, the upper end bodies 2 and the lower end bodies 3 abut against the adjacent two vertebrae, and cooperate with the middle body 1 to connect the upper end bodies 2 and the lower end bodies 3, so as to ensure the distraction effect and make the fusion cage have a certain elastic movement.

[0037] Refer to Figure 2 , Figure 3 , Figure 4 The surfaces of the upper end bodies 2 and the lower end bodies 3 away from the middle body 1 are provided with abutting surfaces 4, the two abutting surfaces 4 are composed of a plurality of pointed protrusions, so as to form a tooth shape, and bone grafting bins 5 are formed in the middle of the two abutting surfaces 4, the lower end body 3 is provided with an auxiliary groove 6 on the surface of the abutting surface 4, the auxiliary groove 6 is in communication with the tooth-shaped groove of the abutting surface 4, and pin holes 9 are formed in the surfaces of the upper end bodies 2 and the lower end bodies 3 and penetrate the abutting surface 4, and fixing holes 10 are formed in the positions of the two pin holes 9 at the upper and lower ends of the middle body 1, and two insertion pins 11 are respectively inserted into the two pin holes 9, and the two insertion pins 11 penetrate the two pin holes 9 and the two fixing holes 10.

[0038] When the upper end body 2 and the lower end body 3 abut against adjacent vertebrae, the two bone grafting bins 5 face the surface of the vertebrae, leaving space for the growth of the bone tissue of the vertebrae, and the upper end body 2 and the lower end body 3 are connected with the middle body 1 to receive the elasticity of the middle body 1, so that there is still an elastic range of movement between the vertebral bodies after the vertebral bodies and the upper end body 2 and the lower end body 3 fuse. The two bone grafting bins 5 can be added with autologous bone, allogeneic bone and artificial bone and other materials to assist the recovery and growth of the bone tissue, the auxiliary slot 6 is located on the abutment surface of the lower end body 3 and the vertebrae, which provides more space for the growth of the bone tissue, facilitates recovery, and the two plugs 11 are respectively inserted into the two fixing holes 10 from the two pin holes 9 to form the overall transverse fixation of the upper end body 2, the lower end body 3 and the middle body 1, and cooperate with the longitudinal fixation formed by the wedge riveting to effectively prevent the slippage during the installation of the fusion cage.

[0039] The implementation principle of the elastic fusion cage is as follows: when the fusion cage is used, the fixed end of the mechanical clamp is turned into the threaded port 12, thereby completing the fixation of the mechanical clamp and the fusion cage, and then the bone material that is helpful for recovery is placed in the bone grafting bin 5, and then the personnel hold the mechanical clamp to stretch the fusion cage into the vertebrae from the surgical opening of the patient, so that the two abutment surfaces 4 abut against the surfaces of the two adjacent vertebrae, thereby preliminarily completing the fixation of the fusion cage.

[0040] When the fusion cage is located between the two vertebrae of the patient, the two vertebrae continuously apply pressure to the upper end body 2 and the lower end body 3, at this time the middle body 1 applies a reverse thrust to the upper end body 2 and the lower end body 3 to form a rebound elasticity, thereby receiving the pressure applied by the bending of the vertebrae when the patient's body moves, and at the same time the two wedge-shaped protrusions 7 are transversely inserted into the wedge-shaped clamping grooves 8 to form the longitudinal fixation of the middle body 1, the upper end body 2 and the lower end body 3, and cooperate with the two plugs 11 respectively inserted into the two fixing holes 10 from the two pin holes 9 to form the transverse fixation of the middle body 1, the upper end body 2 and the lower end body 3, thereby ensuring the overall stability of the fusion cage, and having a certain rebound elasticity while having a distraction effect on the two adjacent vertebrae.

[0041] With the recovery of the patient's body, the bone tissue of the vertebrae first grows into the bone grafting bin 5, and then grows by being covered by the upper end body 2 and the lower end body 3, thereby fixing the fusion cage between the bone tissue, effectively preventing the problem of slippage.

[0042] The above is only an optional embodiment of the present disclosure and is not used to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An elastic fusion device, characterized by: The utility model provides a kind of fusion cage, including the intermediate body (1) with elasticity, wedge-shaped clamping slot (8) is set in the upper and lower ends of the intermediate body (1), the upper end of the intermediate body (1) is riveted with upper end body (2) in wedge-shaped clamping slot (8), the lower end of the intermediate body (1) is riveted with lower end body (3) in wedge-shaped clamping slot (8), the upper end body (2) and lower end body (3) are set with bone grafting bin (5) for and adjacent vertebral body fusion in opposite side, the upper end body (2) and intermediate body (1) and lower end body (3) and intermediate body (1) are inserted and connected with bolt (11) between.

2. An elastic fusion device according to claim 1, characterized in that: The opposite side of the upper end body (2) and lower end body (3) is fixed with wedge-shaped lug (7), two wedge-shaped lugs (7) are respectively inserted with two wedge-shaped clamping slots (8) one by one.

3. An elastic fusion device according to claim 1, wherein: The opposite side of the upper end body (2) and lower end body (3) is set with abutment face (4) around bone grafting bin (5) protruding, two abutment faces (4) are all abutted with adjacent vertebral body.

4. An elastomeric cage according to claim 3, wherein: The surface of the lower end body (3) is set with auxiliary slot (6) for increasing bone growth space in the position of abutment face (4).

5. An elastic fusion device according to claim 1, wherein: The surface of the upper end body (2) and lower end body (3) is set with pinhole (9) through abutment face (4), the upper and lower ends of the intermediate body (1) are set with fixing hole (10) in the position of pinhole (9).

6. An elastic fusion device according to claim 1, wherein: The top of two bolts (11) is inserted with two pinholes (9) one by one, and the bottom of two bolts (11) is inserted with two fixing holes (10) one by one.

7. An elastic fusion device according to claim 1, wherein: The outer surface of the intermediate body (1) is set with screw thread mouth (12) on one side, the screw thread mouth (12) is connected with mechanical forceps in the utility model for holding and taking fusion cage.

8. An elastic fusion device according to claim 7, wherein: The width of the outer surface of the intermediate body (1) is greater on the side close to screw thread mouth (12) than on the side away from screw thread mouth (12).

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