CN115836933A - Intervertebral fusion device - Google Patents
Intervertebral fusion device Download PDFInfo
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- CN115836933A CN115836933A CN202310129479.8A CN202310129479A CN115836933A CN 115836933 A CN115836933 A CN 115836933A CN 202310129479 A CN202310129479 A CN 202310129479A CN 115836933 A CN115836933 A CN 115836933A
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Abstract
The present invention provides an intervertebral cage comprising: a first support plate; the second supporting plate is arranged below the first supporting plate; the adjustable supporting structure is adjustably connected with the first supporting plate and the second supporting plate so that the first supporting plate has a pressing state close to the second supporting plate to move and a resetting state far away from the second supporting plate; the elastic resetting structure is arranged between the first supporting plate and the second supporting plate and applies resetting force to the first supporting plate; wherein, adjustable bearing structure is including setting up bracing piece and the support section of thick bamboo of setting in the second backup pad in the first backup pad, and the hole of a support section of thick bamboo is for the guiding hole with bracing piece interference fit, and one in bracing piece and the support section of thick bamboo is made for macromolecular material. The technical scheme of this application has solved the intervertebral fusion ware among the relevant art effectively and has born pressure or when impact load is great, the relatively poor problem of effect of shock attenuation and buffering.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to an intervertebral fusion cage.
Background
Degenerative disc disease, segment instability and the like are common spinal surgery diseases, seriously affect the life and work of patients, and patients with severe symptoms or patients who are ineffectual in standard conservative treatment need surgical treatment. Since the last 50 s Smith, robinson and clouward developed anterior cervical decompression bone fusion (ACDF), a large number of patients with cervical spondylosis benefited from this classical surgical procedure. With the development of internal fixation instruments, the bone grafting fusion between anterior cervical vertebral bodies with the assistance of an internal fixation system has become a main operation mode for treating spinal cervical spondylosis, so that the fusion rate is improved, and the height of cervical intervertebral space and physiological curvature can be well maintained. The intervertebral fusion device (Bagby and Kuslich, BAK) appeared first in the last 80 th century, and is widely applied after success in lumbar surgery. Since the 90 s, cervical Interbody Fusion Cage (CIFC) has been used in clinical practice and has achieved good results. The interbody fusion cage fuses the upper vertebral body and the lower vertebral body by removing the intervertebral disc of a human body, thereby realizing the functions of ensuring the mechanical stability of the vertebral column, relieving nerve compression and the like and obtaining remarkable effect clinically.
The related art intersomatic cage includes a first support plate, a second support plate, and a spring connected to the first support plate and the second support plate. When the interbody fusion cage bears the pressure, the first supporting plate moves close to the second supporting plate, and the spring is compressed. Since the spring follows Hooke's Law, the force experienced by the spring is linearly related to the amount of extension or compression of the spring. When the pressure or impact load born by the interbody fusion cage is larger, the spring is compressed to the limit position, the interbody fusion cage at the moment is approximately a rigid whole, the shock absorption and buffering effects are poorer, and the stress shielding phenomenon is easily generated near the interbody fusion cage (namely the elastic modulus of the interbody fusion cage is larger than that of human vertebrae at the moment, so that the interbody fusion cage and the bone near the interbody fusion cage are greatly stressed), so that the stress of the bone around the interbody fusion cage is increased, the osteoporosis and even the bone ablation around the interbody fusion cage are easily caused, and further the stability of the interbody fusion cage during use is influenced and the sliding of the interbody fusion cage is even caused.
Disclosure of Invention
The invention mainly aims to provide an interbody fusion cage to solve the problem that the interbody fusion cage in the related art has poor shock absorption and buffering effects when bearing large pressure or impact load.
In order to achieve the above object, the present invention provides an intervertebral cage comprising: a first support plate; the second supporting plate is arranged below the first supporting plate; the adjustable supporting structure is adjustably connected with the first supporting plate and the second supporting plate so that the first supporting plate has a pressing state moving close to the second supporting plate and a resetting state moving far away from the second supporting plate; the elastic resetting structure is arranged between the first supporting plate and the second supporting plate, and when the resetting force applied to the first supporting plate by the elastic resetting structure is greater than the pressure borne by the first supporting plate, the first supporting plate is switched from the extrusion state to the resetting state; the adjustable supporting structure comprises a supporting rod arranged on the first supporting plate and a supporting cylinder arranged on the second supporting plate, an inner hole of the supporting cylinder is a guide hole in interference fit with the supporting rod, and one of the supporting rod and the supporting cylinder is made of a high polymer material.
Further, the diameter of the guide hole is gradually reduced from the first support plate to the second support plate.
Furthermore, the adjustable supporting structure further comprises a first sleeve sleeved outside the supporting cylinder, and the first sleeve is arranged on the second supporting plate.
Furthermore, the adjustable supporting structure further comprises a second sleeve sleeved outside the first sleeve, the second sleeve is arranged on the first supporting plate, and the second sleeve is matched with the first sleeve in a guiding mode.
Further, be provided with the interface with the outside intercommunication of interbody fusion cage on the first backup pad, first sleeve and the sealed cooperation of second sleeve, the inside first confined space that forms of second sleeve, the inside of first backup pad is provided with the gas passage who communicates interface and first confined space.
Furthermore, the elastic reset structure comprises a reset piece, a first guide cylinder arranged on the first supporting plate and a second guide cylinder arranged on the second supporting plate, the reset piece is arranged between the second guide cylinder and the first supporting plate, the first guide cylinder is sleeved outside the second guide cylinder, the first guide cylinder is in sealing fit with the second guide cylinder, a second sealing space is formed inside the first guide cylinder, and the gas channel is communicated with the second sealing space.
Furthermore, the elastic reset structure comprises a reset piece, a first guide cylinder arranged on the first supporting plate and a second guide cylinder arranged on the second supporting plate, the second guide cylinder is nested and matched with the first guide cylinder in a guiding manner, and the reset piece is arranged between the second guide cylinder and the first supporting plate.
Furthermore, the elastic reset structure further comprises a positioning rod arranged on the first supporting plate, and the reset piece is sleeved outside the positioning rod.
Furthermore, the first sleeve is provided with first flanging towards first backup pad one end, and the second sleeve is provided with first flanging towards the one end of second backup pad, and first flanging can backstop the cooperation.
Furthermore, first guide cylinder sleeve is established in the outside of second guide cylinder, and first guide cylinder is provided with the second flanging towards the one end of second backup pad, and the one end of second guide cylinder towards first backup pad is provided with the second flanging, and the second flanging can backstop the cooperation with the second flanging.
By applying the technical scheme of the invention, the intervertebral fusion cage comprises: the support device comprises a first support plate, a second support plate, an adjustable support structure and an elastic reset structure. The second supporting plate is arranged below the first supporting plate. The adjustable support structure is adjustably coupled to the first support plate and the second support plate such that the first support plate has a squeezed state moving closer to the second support plate and a reset state moving away from the second support plate. The elastic reset structure is arranged between the first supporting plate and the second supporting plate. When the reset force applied to the first supporting plate by the elastic reset structure is greater than the pressure borne by the first supporting plate, the first supporting plate is switched to a reset state from an extrusion state. The first support plate and the second support plate are capable of supporting two adjacent vertebrae of a human body. When the interbody fusion cage bears pressure, the first supporting plate is in an extrusion state, and the adjustable supporting structure plays a role in shock absorption and buffering. When the pressure born by the interbody fusion cage disappears, the resetting force exerted by the elastic resetting structure to the first supporting plate is larger than the pressure born by the first supporting plate, and the first supporting plate is in a resetting state so as to reset the first supporting plate. The adjustable supporting structure comprises a supporting rod arranged on the first supporting plate and a supporting cylinder arranged on the second supporting plate. The inner hole of the supporting cylinder is a guide hole in interference fit with the supporting rod. Like this, because the guiding hole is for with bracing piece interference fit, when first backup pad was in the extrusion state, the bracing piece stretched into to the downthehole distance of guiding gradually increasing, the bracing piece received and the guiding hole between frictional force also gradually increase. The bigger the pressure or impact load that first backup pad received, the distance that the bracing piece stretched into in the guiding hole is bigger, and the resistance that the backup pad received is bigger, has improved the shock attenuation and the effect of buffering of interbody fusion cage when receiving great pressure or impact load. One of the support rod and the support cylinder is made of a polymer material. Due to the viscoelasticity of the high polymer material (namely, under the action of an external force, two deformation mechanisms of elasticity and viscosity of the high polymer material exist at the same time), the force borne by the adjustable supporting structure is in nonlinear correlation with the compression amount of the adjustable supporting structure, and the larger the force or load borne by the adjustable supporting structure is, the smaller the deformation amount of the adjustable supporting structure is. Therefore, when the force applied to the adjustable supporting structure is large, the deformation amount can be generated, and the effects of shock absorption and buffering are achieved. Moreover, because the response of the strain of the high polymer material to the stress is not instantly finished, a relaxation process is needed, so that the deformation of the interbody fusion cage after being stressed has a delayed process, which is closer to the actual reaction and function of the human body interbody, the interbody fusion cage can be deformed with the human body vertebral body simultaneously, and the shock absorption and buffering effects of the interbody fusion cage are further improved. Therefore, the technical scheme of the application effectively solves the problem that the effects of shock absorption and buffering are poor when the pressure or impact load born by the intervertebral fusion cage in the related technology is large.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
figure 1 shows a perspective view of an embodiment of an intervertebral cage according to the invention;
FIG. 2 shows a side view of the intervertebral cage of FIG. 1;
FIG. 3 shows a cross-sectional schematic view of the intervertebral cage of FIG. 1;
figure 4 shows an enlarged partial view at a of the intervertebral cage of figure 3;
figure 5 shows a schematic side view of an intervertebral cage according to the invention in cooperation with a semi-rigid rod-and-nail system.
Wherein the figures include the following reference numerals:
10. a first support plate; 11. a first plate body; 12. a first porous structure; 13. a gas channel; 14. an interface;
20. a second support plate; 21. a second plate body; 22. a second porous structure;
30. an adjustable support structure; 31. a first sleeve; 32. a second sleeve; 33. a support bar; 34. a support cylinder; 35. a guide hole; 36. a first inner flanging; 37. a first outward flange;
40. an elastic reset structure; 41. a first guide cylinder; 42. a second guide cylinder; 43. a reset member; 44. positioning a rod; 45. a second inner flanging; 46. a second outer flanging;
51. pedicle screws; 52. a rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 to 4, the intervertebral cage of the present embodiment includes: a first support plate 10, a second support plate 20, an adjustable support structure 30, and a resilient return structure 40. The second support plate 20 is disposed below the first support plate 10. The adjustable support structure 30 is adjustably coupled to the first support plate 10 and the second support plate 20 such that the first support plate 10 has a compressed state moving closer to the second support plate 20 and a reset state moving away from the second support plate 20. The elastic restoring structure 40 is disposed between the first support plate 10 and the second support plate 20. When the elastic restoring structure 40 applies a restoring force to the first support plate 10 that is greater than the pressure applied to the first support plate 10, the first support plate 10 is switched from the squeezed state to the restoring state. Wherein the adjustable support structure 30 comprises a support bar 33 arranged on the first support plate 10 and a support cylinder 34 arranged on the second support plate 20. The inner hole of the support cylinder 34 is a guide hole 35 which is in interference fit with the support rod 33, and one of the support rod 33 and the support cylinder 34 is made of a high polymer material.
Applying the technical solution of this embodiment, the intervertebral cage comprises: a first support plate 10, a second support plate 20, an adjustable support structure 30, and a resilient return structure 40. The second support plate 20 is disposed below the first support plate 10. The adjustable support structure 30 is adjustably coupled to the first support plate 10 and the second support plate 20 such that the first support plate 10 has a compressed state moving closer to the second support plate 20 and a reset state moving away from the second support plate 20. The elastic restoring structure 40 is disposed between the first support plate 10 and the second support plate 20. When the elastic restoring structure 40 applies a restoring force to the first support plate 10 that is greater than the pressure applied to the first support plate 10, the first support plate 10 is switched from the squeezed state to the restoring state. The first support plate 10 and the second support plate 20 can support two adjacent vertebrae of a human body. When the interbody fusion cage is under pressure, the first support plate 10 is in a compressed state, and the adjustable support structure 30 plays a role in shock absorption and buffering. When the pressure born by the interbody fusion cage disappears, and the resetting force exerted by the elastic resetting structure 40 on the first support plate 10 is larger than the pressure born by the first support plate 10, the first support plate 10 is in a resetting state, so that the first support plate 10 is reset. Wherein the adjustable support structure 30 comprises a support bar 33 disposed on the first support plate 10 and a support cylinder 34 disposed on the second support plate 20. The inner hole of the supporting cylinder 34 is a guide hole 35 which is in interference fit with the supporting rod 33. Thus, because the guide hole 35 is in interference fit with the support rod 33, when the first support plate 10 is in the extrusion state, the distance that the support rod 33 extends into the guide hole 35 gradually increases, and the friction between the support rod 33 and the guide hole 35 also gradually increases. When the pressure or impact load received by the first supporting plate 10 is larger, the distance that the supporting rod 33 extends into the guide hole 35 is larger, the resistance received by the supporting plate is larger, and the shock absorption and buffering effects of the intervertebral fusion device when the intervertebral fusion device receives larger pressure or impact load are improved. The support cylinder 34 is made of a polymer material. Due to the viscoelasticity of the polymer material (i.e., the polymer material has two deformation mechanisms of elasticity and viscosity under the action of an external force), the force applied to the adjustable support structure 30 is nonlinearly related to the compression amount of the adjustable support structure 30, so that the larger the force or load applied to the adjustable support structure 30, the smaller the deformation amount of the adjustable support structure 30. Thus, when the force applied to the adjustable support structure 30 is large, the deformation amount can be generated, and the functions of shock absorption and buffering can be achieved. Moreover, because the response of the strain of the high polymer material to the stress is not instantly finished, a relaxation process is needed, so that the deformation of the interbody fusion cage after being subjected to the pressure has a delayed process, which is closer to the actual reaction and function of the human body interbody, the interbody fusion cage can be deformed with the human body vertebral body at the same time, and the shock absorption and buffering effects of the interbody fusion cage are further improved. Therefore, the technical scheme of the embodiment effectively solves the problem that the effects of shock absorption and buffering are poor when the intervertebral fusion cage in the related art bears large pressure or impact load.
Further, the distance between the first support plate 10 and the second support plate 20 is set to L when the intervertebral cage is not subjected to an external force. The elastic modulus of the spring of the intervertebral fusion device in the related technology is similar to the average elastic modulus of the human vertebral body under normal stress, and the elastic modulus of the spring is a fixed value because the elastic modulus is the inherent characteristic of the spring. When the intervertebral cage of the related art is subjected to a pressure greater than the product of the elastic modulus of the spring and L, the spring is compressed to the limit position, and the effects of shock absorption and buffering are poor. The technical scheme of this embodiment is applied, the elastic modulus of adjustable support structure 30 is non-fixed value, not only be more similar to the change of the elastic modulus of human centrum when the atress is normal like this, and when the pressure that human centrum receives is greater than the product of the average elastic modulus and L of human centrum when the atress is normal, along with the crescent of the pressure that human centrum receives, the elastic modulus that adjustable support structure 30 corresponds reduces gradually, interbody fusion cage still can produce the deformation, can absorb impact energy better, in order to play the effect of shock attenuation and buffering, can protect near the sclerotin of interbody fusion cage, and avoid interbody fusion cage to take place the phenomenon of crackle or subsidence, improve interbody fusion cage's life.
In the present embodiment, the adjustable support structure 30 has viscoelasticity, and the strain curve between the force and the deformation of the adjustable support structure 30 is a viscoelasticity curve. Therefore, the elastic material can be matched with the viscoelasticity and the later mechanical property of the human intervertebral disc, and can better simulate the function of the human intervertebral disc so as to optimize the experience of the human body.
In the embodiment not shown in the figures, the support rods are made of polymer material. The polymer material is preferably latex, resin, rubber, or polyethylene. One of the support rod and the support cylinder may also be made of a viscous liquid material.
Further, the diameter of the guide hole 35 is gradually reduced from the first support plate 10 toward the second support plate 20. In this way, due to the matching of the guide holes 35 of the support cylinder 34 and the support rod 33, when the first support plate 10 moves close to the second support plate 20, the friction force between the support rod 33 and the guide holes 35 further increases gradually to offset a part of the larger pressure or impact load applied to the first support plate 10, so as to achieve the functions of shock absorption and buffering.
As shown in fig. 1 to 4, the adjustable supporting structure 30 further includes a first sleeve 31 sleeved outside the supporting cylinder 34, and the first sleeve 31 is disposed on the second supporting plate 20. The first sleeve 31 is provided to stably mount the support cylinder 34 on the second support plate 20, so that the guide hole 35 of the support cylinder 34 is engaged with the support rod 33, thereby making the movement of the first support plate 10 closer to or farther from the second support plate 20 more stable. The end surface of the support cylinder 34 facing the first support plate 10 is flush with the end surface of the first sleeve 31 facing the first support plate 10.
As shown in fig. 1 to 4, the adjustable supporting structure 30 further includes a second sleeve 32 sleeved outside the first sleeve 31. The second sleeve 32 is disposed on the first support plate 10, and the second sleeve 32 is in guiding fit with the first sleeve 31. The second sleeve 32 is provided to make the relative movement between the first sleeve 31 and the second sleeve 32 smoother so that the guide hole 35 and the support bar 33 can make the relative movement in the direction of the guide hole 35. Moreover, the arrangement of the first sleeve 31 and the second sleeve 32 isolates the support tube 34 and the support bar 33 from human tissues, thereby avoiding the situation that the growth of the human tissues hinders the relative movement between the support tube 34 and the support bar 33.
As shown in fig. 1 to 4, the first support plate 10 is provided with a port 14 communicating with the outside of the intersomatic cage. The first sleeve 31 is in sealing engagement with the second sleeve 32, and the interior of the second sleeve 32 forms a first sealed space. The first support plate 10 is internally provided with a gas passage 13 communicating the interface 14 with the first sealed space. Thus, when it is required to place the intersomatic cage between two adjacent vertebrae of the human body, air in the first sealed space is evacuated through the air passage 13 from the interface 14 to make the first sealed space a vacuum environment, and at this time, the first support plate 10 is moved close to the second support plate 20 due to air pressure to shorten the distance between the first support plate 10 and the second support plate 20, thereby facilitating the placement of the intersomatic cage between two adjacent vertebrae of the human body. After the intersomatic cage is placed between the adjacent two vertebrae of the human body, the first sealed space is communicated with the atmosphere through the gas passage 13, and the first support plate 10 is moved away from the second support plate 20 by the atmospheric pressure in the first sealed space, so that the distance between the first support plate 10 and the second support plate 20 is increased to facilitate the support of the intersomatic cage to the adjacent two vertebrae of the human body.
As shown in fig. 1 to 4, the elastic restoring structure 40 includes a restoring member 43, a first guide cylinder 41 disposed on the first support plate 10, and a second guide cylinder 42 disposed on the second support plate 20. The reset piece 43 is arranged between the second guide cylinder 42 and the first support plate 10, and the first guide cylinder 41 is sleeved outside the second guide cylinder 42. The restoring member 43 is provided to facilitate the application of restoring force to the first support plate 10. The arrangement of the first guide cylinders 41 and the second guide cylinders 42 makes the movement of the restoring member 43 closer to or farther from the second support plate 20 more smooth when it is rebounded and compressed. Moreover, the arrangement of the first guide cylinder 41 and the second guide cylinder 42 enables the restoring member 43 to be isolated from the human tissue, thereby avoiding the situation that the human tissue grows to block the compression and rebound of the restoring member 43. The first guide cylinder 41 and the second guide cylinder 42 are in sealing fit, a second sealed space is formed inside the first guide cylinder 41, and the gas passage 13 is communicated with the second sealed space. Thus, when it is required to place the intersomatic cage between two adjacent vertebrae of the human body, air in the second sealed space is evacuated through the air passage 13 from the interface 14 to make the second sealed space a vacuum environment, and at this time, the first support plate 10 is moved close to the second support plate 20 due to air pressure to shorten the distance between the first support plate 10 and the second support plate 20, thereby facilitating the placement of the intersomatic cage between two adjacent vertebrae of the human body. After the intersomatic cage is placed between the adjacent two vertebrae of the human body, the second sealed space is communicated with the atmosphere through the gas passage 13, and the first support plate 10 is moved away from the second support plate 20 by the atmospheric pressure in the second sealed space, so that the distance between the first support plate 10 and the second support plate 20 is increased to facilitate the support of the intersomatic cage to the adjacent two vertebrae of the human body. The second sealed space is provided so that when air is drawn from the mouthpiece 14 through the air passage 13, the first support plate 10 is further facilitated to move closer to the second support plate 20.
In the present embodiment, the first support plate 10, the inner side wall of the second sleeve 32 and the end surface of the first sleeve 31 facing the first support plate 10 are enclosed to form a first sealed space. The first support plate 10, the inner side wall of the first guide cylinder 41, and the end surface of the second guide cylinder 42 facing the first support plate 10 are enclosed as a second sealed space. When the distance between the first support plate 10 and the second support plate 20 is the shortest, the stopper is used to block the interface 14 so that the first support plate 10 can be maintained in a state of the shortest distance from the second support plate 20 when the intersomatic cage is placed between two adjacent vertebrae of a human body. The return member 43 is preferably a compression spring.
As shown in fig. 1 to 4, the elastic restoring structure 40 includes a restoring member 43, a first guide cylinder 41 disposed on the first support plate 10, and a second guide cylinder 42 disposed on the second support plate 20, the second guide cylinder 42 is nested and guided with the first guide cylinder 41, and the restoring member 43 is disposed between the second guide cylinder 42 and the first support plate 10. The restoring member 43 is provided to facilitate the application of restoring force to the first support plate 10. The arrangement of the first guide cylinders 41 and the second guide cylinders 42 makes the movement of the restoring member 43 closer to or farther from the second support plate 20 more smooth when it is rebounded and compressed. Moreover, the arrangement of the first guide cylinder 41 and the second guide cylinder 42 enables the restoring member 43 to be isolated from the human tissue, thereby avoiding the situation that the human tissue grows to block the compression and rebound of the restoring member 43.
It should be noted that, the nesting and guiding cooperation between the second guide cylinder 42 and the first guide cylinder 41 means that the first guide cylinder 41 is sleeved outside the second guide cylinder 42, and the inner side wall of the first guide cylinder 41 is in contact with the outer side wall of the second guide cylinder 42 and can move back and forth along the axial direction of the second guide cylinder 42. Or the second guide cylinder is sleeved outside the first guide cylinder, and the inner side wall of the second guide cylinder is in contact with the outer side wall of the first guide cylinder and can move back and forth along the axial direction of the first guide cylinder.
As shown in fig. 1 to 4, the elastic restoring structure 40 further includes a positioning rod 44 disposed on the first support plate 10, and the restoring member 43 is sleeved outside the positioning rod 44. The positioning rod 44 is convenient for the resetting piece 43 to be in rebound and compressed states, and the position of the resetting piece 43 can be fixed, so that the deviation of the position of the resetting piece 43 is avoided, and the first support plate 10 can move more stably when approaching or being far away from the second support plate 20. In the present embodiment, the positioning rod 44 and the supporting rod 33 are preferably made of metal materials, such as TC4 titanium alloy and tantalum metal.
As shown in fig. 1 to 4, the first sleeve 31 is provided with a first outward flange 37 at an end facing the first support plate 10, and the second sleeve 32 is provided with a first inward flange 36 at an end facing the second support plate 20. The first inner flange 36 and the first outer flange 37 can be matched in a stop mode. The arrangement of the first inner flange 36 and the first outer flange 37 can limit the displacement between the first sleeve 31 and the second sleeve 32, and when the first inner flange 36 is matched with the first outer flange 37 in a stop way, the distance between the first support plate 10 and the second support plate 20 is the largest, so that the over-adjustment of the intervertebral fusion device is prevented.
In an embodiment not shown in the drawings, the inner edge of the first inner flange is provided with a first sealing ring, and the first sealing ring abuts against the outer side wall of the first sleeve, so that the first sleeve and the second sleeve can be better in sealing fit. Or, the outer edge of the first flanging is provided with a second sealing ring which abuts against the inner side wall of the second sleeve, so that the first sleeve and the second sleeve can be better in sealing fit.
As shown in fig. 1 to 4, the first guide cylinder 41 is sleeved outside the second guide cylinder 42, and a second inward flange 45 is disposed at one end of the first guide cylinder 41 facing the second support plate 20. The end of the second guide cylinder 42 facing the first support plate 10 is provided with a second flanging 46, and the second flanging 45 and the second flanging 46 can be matched in a stopping manner. The second inner flange 45 and the second outer flange 46 are arranged to limit the displacement between the first guide cylinder 41 and the second guide cylinder 42, and when the second inner flange 45 is matched with the second outer flange 46 in a stopping way, the distance between the first support plate 10 and the second support plate 20 is the largest, so that the over-adjustment of the intervertebral fusion device is prevented. In the embodiment not shown in the figures, the inner edge of the second inner flange is provided with a third sealing ring, and the third sealing ring abuts against the outer side wall of the second guide cylinder, so that the first guide cylinder and the second guide cylinder can be better in sealing fit. Or, the outer edge of the second flanging is provided with a fourth sealing ring which abuts against the inner side wall of the first guide cylinder, so that the first guide cylinder and the second guide cylinder can be better in sealing fit.
In the present embodiment, the first support plate 10 comprises a first plate body 11 and a first porous structure 12, the first porous structure 12 being arranged on the surface of the first plate body 11 facing away from the second support plate 20, and the gas channels 13 being arranged in the first plate body 11. The second support plate 20 comprises a second plate body 21 and a second porous structure 22, the second porous structure 22 being arranged on a surface of the second plate body 21 facing away from the first support plate 10. The first porous structure 12 and the second porous structure 22 are arranged such that after the intervertebral cage is placed between two adjacent vertebrae of a human body, the first porous structure 12 and the second porous structure 22 of the intervertebral cage can be combined with the vertebrae of the human body to promote bone ingrowth between the vertebrae and the intervertebral cage to improve stability of the intervertebral cage. The first plate body 11 and the second plate body 21 are arranged to ensure the mechanical properties and rigidity of the first support plate 10 and the second support plate 20, so that the first support plate and the second support plate are not easy to bend and deform under load or pressure. In the present embodiment, the adjustable supporting structures 30 and the elastic restoring structures 40 are multiple, and the multiple adjustable supporting structures 30 and the elastic restoring structures 40 are arranged on the first supporting plate 10 and the second supporting plate 20 at equal intervals, so that the stress of the first supporting plate 10 and the second supporting plate 20 is more uniform, and the distance between the first supporting plate 10 and the second supporting plate 20 can be self-adjusted when the intervertebral fusion device is under pressure, so as to simulate the height adjusting function of the vertebral body of the human body, and provide supporting force and rigidity. The range of adjustment of the distance between the first support plate 10 and the second support plate 20 can be adjusted according to the specific dimensions and properties of the adjustable support structure 30 and the resilient return structure 40.
In this embodiment, the intervertebral cage cooperates with a rod and staple system for fixation between two adjacent vertebrae of a human body, as shown in figure 5. The rod-nail system includes pedicle screws 51 fixed to two adjacent vertebrae of the human body and a rod 52 connected to the two pedicle screws 51.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An intervertebral cage, comprising:
a first support plate (10);
a second support plate (20) disposed below the first support plate (10);
an adjustable support structure (30) adjustably connected to the first support plate (10) and the second support plate (20) so that the first support plate (10) has a squeezed state moving closer to the second support plate (20) and a reset state moving away from the second support plate (20);
the elastic resetting structure (40) is arranged between the first supporting plate (10) and the second supporting plate (20), and when the resetting force applied to the first supporting plate (10) by the elastic resetting structure (40) is greater than the pressure applied to the first supporting plate (10), the first supporting plate (10) is switched from the extrusion state to the resetting state;
wherein, adjustable bearing structure (30) are including setting up bracing piece (33) on first backup pad (10) and setting up support section of thick bamboo (34) on second backup pad (20), the hole of support section of thick bamboo (34) be with bracing piece (33) interference fit's guiding hole (35), bracing piece (33) with one in the support section of thick bamboo (34) is made by macromolecular material.
2. Intervertebral cage according to claim 1, characterized in that the diameter of the guide holes (35) decreases progressively in the direction from the first support plate (10) to the second support plate (20).
3. The intersomatic cage according to claim 1, characterized in that the adjustable support structure (30) further comprises a first sleeve (31) which is sleeved outside the support cylinder (34), the first sleeve (31) being arranged on the second support plate (20).
4. An intersomatic cage according to claim 3, characterized in that the adjustable support structure (30) further comprises a second sleeve (32) which is sleeved outside the first sleeve (31), the second sleeve (32) being provided on the first support plate (10), the second sleeve (32) being in guiding engagement with the first sleeve (31).
5. Intersomatic cage according to claim 4, characterized in that the first support plate (10) is provided with a port (14) communicating with the outside of the intersomatic cage, the first sleeve (31) being in sealing engagement with the second sleeve (32), the interior of the second sleeve (32) forming a first sealed space, the interior of the first support plate (10) being provided with a gas channel (13) communicating the port (14) with the first sealed space.
6. The intersomatic cage according to claim 5, wherein the elastic restoring structure (40) includes a restoring member (43), a first guiding cylinder (41) disposed on the first support plate (10), and a second guiding cylinder (42) disposed on the second support plate (20), the restoring member (43) is disposed between the second guiding cylinder (42) and the first support plate (10), the first guiding cylinder (41) is sleeved outside the second guiding cylinder (42), the first guiding cylinder (41) is in sealing fit with the second guiding cylinder (42), a second sealing space is formed inside the first guiding cylinder (41), and the gas channel (13) is communicated with the second sealing space.
7. Intervertebral cage according to claim 1, characterized in that the elastic reduction structure (40) comprises a reduction element (43), a first guide cylinder (41) arranged on the first support plate (10) and a second guide cylinder (42) arranged on the second support plate (20), the second guide cylinder (42) being nested and guided in cooperation with the first guide cylinder (41), the reduction element (43) being arranged between the second guide cylinder (42) and the first support plate (10).
8. The intersomatic cage according to claim 7, characterized in that the elastic restoring structure (40) further comprises a positioning rod (44) disposed on the first support plate (10), the restoring member (43) being sleeved outside the positioning rod (44).
9. Intervertebral cage according to claim 4, characterized in that the first sleeve (31) is provided with a first flanging (37) towards the end of the first support plate (10), and the second sleeve (32) is provided with a first inner flanging (36) towards the end of the second support plate (20), the first inner flanging (36) being in stop-fit with the first flanging (37).
10. The intervertebral fusion cage according to claim 7, characterized in that the first guide cylinder (41) is sleeved outside the second guide cylinder (42), a second inward flange (45) is arranged at one end of the first guide cylinder (41) facing the second support plate (20), a second outward flange (46) is arranged at one end of the second guide cylinder (42) facing the first support plate (10), and the second inward flange (45) and the second outward flange (46) can be in stop fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129479.8A CN115836933B (en) | 2023-02-17 | 2023-02-17 | Intervertebral fusion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129479.8A CN115836933B (en) | 2023-02-17 | 2023-02-17 | Intervertebral fusion device |
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| CN115836933A true CN115836933A (en) | 2023-03-24 |
| CN115836933B CN115836933B (en) | 2023-09-01 |
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Cited By (1)
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| CN117204990A (en) * | 2023-11-09 | 2023-12-12 | 北京爱康宜诚医疗器材有限公司 | Atlantoaxial lateral mass joint fusion device |
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| CN115836933B (en) | 2023-09-01 |
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