CN212416000U - Percutaneous intervertebral fusion system - Google Patents

Abstract

The utility model discloses a percutaneous intervertebral fusion system, include: the net bag is provided with at least one end fixedly connected to the variable-height supporting device, the net bag is wrapped outside the variable-height supporting device or is positioned between the variable-height supporting devices, the variable-height supporting device is detachably connected with the adjusting device, the adjusting device is operated to realize height change of the variable-height supporting device, and the filling material is implanted into the net bag through the adjusting device. The utility model provides a percutaneous interbody fusion system, its main technical scheme rely on variable high strutting arrangement expansion molding and implant bone filler material and realize this integration ware inflation, can adapt to different intervertebral disc space height and provide bigger size's vertebra body contact surface and provide good support, do benefit to the fusion of adjacent centrum.

Description

Percutaneous intervertebral fusion system

Technical Field

The utility model relates to a backbone interbody fusion field especially relates to a percutaneous interbody fusion system.

Background

Degenerative spinal diseases and structural damage are important causes of pain in the neck, shoulders, waist and legs, and impaired or even lost sensory and motor functions. In the last 50 s, Cloward first proposed posterior lumbar fusion PLIF, a technique developed as one of the basic surgical procedures for spinal surgery today. Badgy and Kuslich designed an interbody fusion Cage suitable for human in 1986, i.e., the BAK system. Since then, the interbody bone-grafting fusion technology has been greatly developed, and becomes a basic operation mode for treating spinal degenerative diseases and structural injuries.

The principle of the interbody fusion cage is that after the interbody fusion cage is implanted, the muscle, the fibrous ring and the anterior and posterior longitudinal ligaments of the fusion segment are in a continuous tension state by the distraction force, so that the fusion segment and the fusion cage achieve three-dimensional super-static fixation. And secondly, the intervertebral fusion cage recovers the stress and the stability of the front and middle columns of the spine, recovers and maintains the inherent physiological bulge of the spine, enlarges intervertebral foramen and relieves the pressure of the dural sac and nerve roots by recovering the height of the intervertebral space. The hollow structure of the intervertebral fusion cage provides a good mechanical environment for the fusion of the cancellous bone therein, thereby achieving the purpose of interface permanent fusion.

The existing conventional fusion cage is generally of a series of box-type structures with fixed shapes, adapts to different vertebral body gaps by means of a series of height models and cannot be completely matched with the vertebral body gaps of patients; in order to achieve a good supporting effect, the supporting surface needs to be as large as possible during design, so that an implantation channel is large, the injury to a patient is large, and the postoperative recovery is slow. The existing minimally invasive fusion cage can enter the intervertebral space of a patient through a small channel, but cannot provide a large support area, and the end plate is collapsed due to stress concentration; or like the mesh bag fusion cage can enter the way through a small channel and expand in the intervertebral space, a larger vertebral body contact surface and a fusion area are provided, but the mesh bag fusion cage is easy to be stressed and compressed, the height of the intervertebral space is lost, the fusion effect is influenced, and secondary damage is caused to a patient.

In summary, the existing minimally invasive fusion device can only realize the variable height direction or width direction in the aspect of mechanical structure, the height is increased and the contact area of the vertebral body cannot be compatible, and the mechanical structure limits the bone grafting space, thereby affecting the fusion effect; most of the existing fusion devices adopted in the intervertebral fusion operation are in a block shape with a fixed shape, have a large volume, need a large access channel when being implanted and have large injury to patients; in the existing minimally invasive mesh bag fusion cage, minimally invasive entry into the intervertebral space and expansion are realized in a mesh bag and filling material mode, although a larger vertebral body contact area and fusion area are provided, the fusion cage is possibly compressed when being stressed in normal activities of people, so that the intervertebral space is highly lost, and the fusion effect is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a percutaneous intervertebral fusion system which has a larger contact area and a fusion area with the upper and lower centrum and has a good supporting effect and can be implanted in a minimally invasive way.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a percutaneous intervertebral fusion system, including pocket, at least one variable high strutting arrangement, filler material and adjusting device, the pocket has at least one end fixed connection in on the variable high strutting arrangement, the pocket parcel is in the variable high strutting arrangement is outer or be located a plurality ofly between the variable high strutting arrangement, the variable high strutting arrangement with adjusting device can dismantle the connection, the operation adjusting device realizes variable high strutting arrangement's altitude variation, filler material passes through adjusting device implants in the pocket.

Further, the percutaneous intervertebral fusion system also comprises a support rod transversely contacted with the vertebral body surface, and the support rod is connected with the top end part of the variable high support device.

Further preferably, the supporting rod is composed of a plurality of rods, and the rods are connected to form a diamond-shaped supporting surface.

Further preferably, the support rod is rotatably hinged with the variable height support device.

Further preferably, the support rod and the variable height support device are of an integrated structure.

Further preferably, the support rod is provided with a protrusion or a barb structure.

Further, a one-way valve is arranged inside the proximal end of the variable height supporting device.

Further, an axial locking device is arranged inside the variable height supporting device, and the axial locking device can be an automatic axial locking device or a manual axial locking device.

Further preferably, the automatic axial locking device is a locking structure comprising at least one pair of catches, and the manual axial locking device is a threaded locking structure.

Further, the variable height support means comprises at least one multi-bar support structure arranged along an axis.

Further preferably, the multi-bar support structure comprises at least one pair of rotatable hinge bars that are axially compressed and radially expanded in an arcuate manner.

Further, the mesh bag is a porous bag structure, and the porous bag structure is a mesh bag structure formed by weaving or hot melting flexible materials.

Further preferably, the flexible material is a polymer material, a metal material or a mixture of the polymer material and the metal material.

Further preferably, the polymer material is a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, or a PGS material, and the metal material is titanium, nitinol, platinum, stainless steel, or cobalt chromium.

Further preferably, the porous capsular bag structure limits the shape of the mesh bag after intervertebral expansion molding by changing the knitting process, or by repeatedly knitting the periphery, or by changing the diameter of the knitting thread, or by the nature of the material.

Furthermore, adjusting device includes ejector sleeve, interior mounting, outer tube, adjustment handle, but variable high strutting arrangement's distal end with interior mounting distal end is dismantled fixed connection, operates adjustment handle, realizes variable high strutting arrangement's change.

The above technical scheme is adopted in the utility model, compared with the prior art, following technological effect has:

(1) rely on variable high strutting arrangement expansion and implantation bone filler material realize this system of fusing inflation, can adapt to different intervertebral space height, in addition, one of them preferred mode still includes the bracing piece with the horizontal contact of centrum face, in further preferred mode, set up the bracing piece into the rhombus holding surface that the multi-bar is connected, make this system of fusing provide bigger size's centrum contact surface at the postoperative, strengthen the compressive strength and the compression rigidity that fuse the ware, help in the intervertebral space height of adaptation difference, maintain intervertebral space height, provide good support, thereby reach better centrum and fuse the effect.

(2) Compare pure pocket and fuse the ware much but variable high strutting arrangement supports to set up adjusting device, the variable high strutting arrangement after the firm shaping, when stepless adaptation intervertebral disc space, can effectively prevent the loss of postoperative centrum height, do benefit to the centrum and fuse.

(3) The filling material of the percutaneous intervertebral fusion system is bone filling material, the contact area of the vertebral bodies is the fusion area, and the larger fusion area is beneficial to the fusion of the adjacent vertebral bodies;

(4) the fusion cage system is filled with bone filling materials with different structures and particle sizes according to the proportion, so that a better supporting effect and a better fusion effect can be provided;

(5) the side surface of the mesh bag in the preferable scheme used in the fusion device system can enhance the circumferential strength of the mesh bag through a specific weaving mode, and adverse events such as leakage of filling materials or fusion failure after operation are prevented; meanwhile, the forming form of the mesh bag is controlled, the potential safety hazard that peripheral tissues and nerves are extruded due to excessive expansion caused by the fact that the mesh bag is not limited in the forming process of the mesh bag in the operation is eliminated, and the safety of the forming process of the mesh bag in the operation is facilitated.

(6) The fusion device can pass through a surgical working channel with the diameter of 7mm or less, so that the wound of the vertebral body fusion surgery is smaller.

(7) In the preferred scheme, the mesh bag material is set to be the metal titanium wire, and has better biocompatibility due to the stable metal characteristics of high hardness, light weight, no rustiness, no deterioration and no allergy to human bodies. In the field of orthopedic implants, titanium has the functions of promoting bone fusion and bone repair and can enhance the fusion effect of the interbody fusion cage.

Drawings

FIG. 1 is a schematic view of the percutaneous intervertebral fusion system according to the present invention in an operational state;

FIG. 2 is a cross-sectional view of a single layer variable height support device of a percutaneous interbody fusion system of the present invention after formation;

FIG. 3 is a cross-sectional view of a post-formation multi-layered single variable height support device of a percutaneous interbody fusion system of the present invention;

FIG. 4 is a schematic view of a single variable height support device of a percutaneous interbody fusion system of the present invention formed by an adjustment device;

FIG. 5 is a cross-sectional view of a plurality of variable height struts of a percutaneous interbody fusion system of the present invention, shown after formation outside the mesh bag;

FIG. 6 is a cross-sectional view of a plurality of variable height struts of a percutaneous interbody fusion system of the present invention after formation in a mesh bag;

FIG. 7 is a schematic view of an axial locking device of a percutaneous interbody fusion system of the present invention outside the mesh bag;

FIG. 8 is a schematic view of an axial locking device of a percutaneous interbody fusion system of the present invention in a mesh bag;

FIG. 9 is a schematic view of another axial locking device of a percutaneous intervertebral fusion system of the present invention;

FIG. 10 is a schematic view of a percutaneous interbody fusion system of the present invention releasing a variable height support device from an axial locking device;

FIG. 11 is a schematic view of the formation of the variable height support device released by the percutaneous interbody fusion system shown in FIG. 10;

FIG. 12 is a schematic view of a percutaneous interbody fusion system of the present invention releasing a plurality of variable height support devices from an axial locking device;

FIG. 13 is a schematic illustration of the percutaneous interbody fusion system of FIG. 12 during formation of the release variable height support device;

FIG. 14 is a schematic view of an adjustment device of a percutaneous interbody fusion system of the present invention;

FIG. 15 is a schematic view of a protrusion or barb formed on a strut of a percutaneous interbody fusion system of the present invention;

FIG. 16 is a schematic view of a variable height support device of the present invention as viewed from a proximal end to a distal end after formation of a percutaneous interbody fusion system;

FIG. 17 is a schematic view of a mesh bag of a percutaneous interbody fusion system of the present invention;

FIG. 18 is a schematic view of another embodiment of a mesh bag of the percutaneous interbody fusion system of the present invention;

wherein the reference symbols are:

1-mesh bag, 2-variable height supporting device, 21-distal end head, 22-proximal end head, 3-filling material, 4-adjusting device, 41-push tube, 42-inner fixing piece, 43-outer tube, 44-adjusting handle, 5-support rod, 6-axial locking device, 61-buckle tube body, 62-clamping groove, 63-clamping block, 64-lining core and 65-thread sleeve.

Detailed Description

The utility model provides a percutaneous interbody fusion system, its main technical scheme rely on variable high strutting arrangement expansion and implant bone filler material and realize this fusion system inflation, can adapt to different intervertebral disc space height and provide the body contact surface of bigger size to provide good support, do benefit to the fusion of adjacent centrum.

Referring to fig. 1-3, the present embodiment provides a percutaneous intervertebral fusion system, comprising: the height-adjustable net bag comprises a net bag 1, at least one height-adjustable supporting device 2, a filling material 3 and an adjusting device 4, wherein at least one end of the net bag 1 is fixedly connected to the height-adjustable supporting device 2, the net bag 1 is wrapped outside the height-adjustable supporting device 2 or is positioned among a plurality of height-adjustable supporting devices 2, the height-adjustable supporting devices 2 are detachably connected with the adjusting device 4, the adjusting device 4 is operated to realize height change of the height-adjustable supporting devices 2, and the filling material 3 is implanted into the net bag 1 through the adjusting device 4.

As a preferred embodiment, referring to FIG. 1, the percutaneous intervertebral fusion system further comprises a support rod 5 transversely contacting the vertebral body surface, the support rod is connected with the top end part of the variable height support device 2; the supporting rod 5 and the variable height supporting device 2 are in rotatable hinge connection or integrated structure; the variable height support 2 comprises at least one multi-bar support structure arranged along an axis; the multi-bar support structure includes at least a pair of rotatable hinge bars that are axially compressed and radially expanded in an arcuate manner.

As shown in fig. 16, after the percutaneous intervertebral fusion system is formed, when the variable height support device 2 is pressed in a direction perpendicular to the contact surface of the vertebral body, the left and right ends of the support rod 5, which are opposite to the variable height support device 2, have inward-gathered tension parallel to the contact surface of the vertebral body, so that the compression resistance and the compression rigidity of the variable height support device 2 in the direction perpendicular to the contact surface of the vertebral body after being formed are enhanced, which is helpful for maintaining the intervertebral space height and is beneficial for the fusion effect.

As another preferred embodiment, the support bar 5 is composed of a plurality of bars connected to form a diamond-shaped support surface.

As another preferred embodiment, please refer to fig. 15, the support rod 5 is provided with a protrusion or a barb structure.

In a preferred embodiment, the variable height support device 2 is made of an implantable metal material or a polymer material, and is cut from a metal or polymer pipe, or is integrally injection-molded.

As a preferred embodiment, referring to fig. 1-6, the vertebral body contact surface of the expanded high support device 2 is curved or convex in a direction perpendicular to the vertebral body contact surface; the diameter of the variable-height supporting device 2 is gradually reduced from the near end to the far end, namely the far end pipe body of the variable-height supporting device 2 is thinner than the near end tank body, so that the far end pipe body is firstly expanded and formed under the condition that the near end of the variable-height supporting device 2 is axially stressed, and the implantation safety of the fusion cage is facilitated; or by the constraint of the outer tube 43, thereby shaping the distal end of the variable height support device 2.

As a preferred embodiment, with continuing reference to fig. 1, 7-9, the percutaneous intervertebral fusion system further comprises an axial locking device 6 for axially locking the expandable high support device 2 after expansion molding, wherein the axial locking device 6 is a snap locking structure or a screw locking structure; compare the pure pocket of tradition and fuse the ware, this percutaneous intervertebral fusion system has had more the support of variable high strutting arrangement 2 and bracing piece 5 to set up axial locking device 6, firm shaping can become high strutting arrangement, prevents effectively that the postoperative centrum height from losing, does benefit to the centrum and fuses.

Referring to fig. 5 to 8, the locking structure includes a locking tube 61 and a locking groove 62, the locking groove 62 is disposed at two ends of the variable height support device 2, the locking tube 61 is disposed in the variable height support device 2, and two ends of the locking tube 61 are respectively provided with a locking block 63 corresponding to the locking groove 62, so that the locking tube 61 and the locking groove 62 are automatically matched to achieve automatic axial locking during the expansion process of the variable height support device 2.

Referring to fig. 9, the screw locking mechanism is composed of a lining core 63 and a threaded sleeve 64, the lining core 63 is disposed in the variable height support device 2, the distal end of the lining core 63 is connected to the distal end of the variable height support device 2, the proximal end of the lining core is connected to the threaded sleeve 64 in a threaded manner, the threaded sleeve 64 is fixedly connected to the push tube 41, and during the expansion process of the variable height support device 2, the threaded sleeve 64 and the lining core 63 are connected in a threaded manner to achieve manual axial locking.

As another preferred embodiment, referring to fig. 14, the adjusting device includes a pushing tube 41, an inner fixing member 42, an outer tube 43, and an adjusting handle 44, the distal end of the variable height supporting device 2 is detachably and fixedly connected to the distal end of the inner fixing member 42, and the adjusting handle is operated to change the variable height supporting device 2. The inner fixing piece 42 is arranged in the variable height supporting device 2 in a penetrating way, and the far end of the inner fixing piece is detachably connected with the far end of the variable height supporting device 2; the push pipe 41 is sleeved outside the inner fixing member 42, and the distal end thereof is connected with the proximal end of the variable height supporting device 2; the outer tube 43 is sleeved outside the mesh bag 1, the variable-height supporting device 2 and the push tube 41, and the outer tube 43 can move along the length direction of the variable-height supporting device 2 to release the mesh bag 1 and the variable-height supporting device 2.

As a preferred embodiment, referring to fig. 5-7, the distal end of the variable height support device 2 is detachably connected to the distal end of the inner fixing element 42 through the distal tip 21; and the proximal end of the variable height support means 2 is connected to the distal end of the push tube 41 by a proximal head 22. The far end of the variable height supporting device 2 is far away from the operator and is connected with the far end head 21, the near end of the variable height supporting device 2 is connected with the near end head 22 communicated with the outside, the far end head 21 is provided with a connecting hole, and the far end of the inner fixing piece 42 is fixed in the connecting hole in a buckling mode.

As a preferred embodiment, and with continued reference to fig. 5 and 6, the two ends of the mesh bag 1 are respectively attached to the variable height support device 2 or the distal and proximal heads 21 and 22 by means of adhesive, binding wires, a collar or a press ring.

The mesh bag 1 may be woven from implantable filaments, such as a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, a PGS material, titanium, nitinol, platinum, stainless steel, or cobalt chromium; it may also be a thin film mesh bag made of an implantable material, such as a sintered PTFE thin film mesh bag. Referring to fig. 17, the mesh bag 1 changes the knitting process during the knitting process to reduce the side aperture and the deformation, so as to increase the circumferential strength of the mesh bag 1 and to define the forming shape of the mesh bag 1. Alternatively, the mesh bag may be formed by repeating the weaving of the outer periphery to increase the strength of the outer periphery, so as to increase the strength of the mesh bag 1 in the circumferential direction and to define the shape of the mesh bag 1. Alternatively, referring to fig. 18, the mesh bag 1 adjusts the side gap by changing the diameter of the braided wire, so as to increase the circumferential strength of the mesh bag 1 and define the forming shape of the mesh bag 1. Or the mesh bag 1 is woven by selecting the weaving wire rod side surface with the elasticity modulus larger than that of the weaving wire rod of the vertebral body contact surface, so that the increase of the circumferential strength of the mesh bag 1 and the limitation of the forming shape of the mesh bag 1 are realized. By pushing the filling material 2 into the collapsible mesh bag 1, the fusion system can be made to adapt steplessly to different vertebral body spaces. The increase of the circumferential strength of the mesh bag can effectively prevent the risk of bone leakage after operation; the limitation of the forming shape of the mesh bag eliminates the potential safety hazard of extruding peripheral tissues and nerves due to over expansion caused by no limitation in the forming process of the mesh bag in the operation, and is favorable for the safety in the forming process of the mesh bag in the operation.

The utility model provides a percutaneous interbody fusion system is an interbody minimal access fusion cage with variable high strutting arrangement, variable high strutting arrangement 2 mainly includes single variable high strutting arrangement type and many variable high strutting arrangement types in own structure.

The utility model provides a percutaneous interbody fusion system is an interbody wicresoft fusion cage with variable high strutting arrangement, the shaping mode of variable high strutting arrangement 2 in the intervertebral space mainly includes following two kinds:

firstly, an outer tube limiting type: as shown in fig. 10 and 11, the variable-height supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, after the fusion system enters the intervertebral space through the working channel, the outer tube 43 is withdrawn backwards, a section of the tubular variable-height supporting device 2 is released, the variable-height supporting device 2 is axially pushed towards the far end through the push tube 41, so that a section of the variable-height supporting device 2 exposed outside the outer tube 43 is radially expanded, after the forming is finished, the outer tube 43 is continuously withdrawn, a section of the variable-height supporting device 2 is released, and the push tube 41 is used for radially expanding the variable-height supporting device 2; repeating the steps until the variable-height supporting device 2 of the fusion cage is completely molded;

secondly, designing the thickness of the variable-height supporting device rod: as shown in fig. 12 and 13, the variable height supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, after entering the intervertebral space through the working channel, the outer tube 43 is withdrawn backwards to completely release the tubular variable height supporting device 2, and then the pushing tube 41 axially pushes the variable height supporting device 2 towards the far end, so that the variable height supporting device 2 radially expands to be completely molded in the intervertebral space.

The present invention will be described in detail and specifically with reference to specific embodiments so as to provide a better understanding of the present invention, but the following embodiments do not limit the scope of the present invention. In various embodiments, the proximal end is the end closer to the operator and the distal end is the end farther from the operator, unless otherwise specified

Example 1

Single variable high strutting arrangement:

as shown in fig. 2, the percutaneous intervertebral fusion system is composed of a mesh bag 1, a variable height supporting device 2 and a filling material 3, wherein the mesh bag 1 is arranged on the variable height supporting device 2. The height-variable supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, the proximal end of the fusion device is contacted with the push tube 41, and the distal end is detachably connected with the inner fixing piece 42.

After entering the intervertebral space through the working channel, the outer tube 43 is withdrawn backwards, completely freeing the tubular variable height support device 2, as shown in figure 4. The push tube 41 is used for axially pushing the variable-height supporting device 2 to the far end, so that the radial expansion forming of the variable-height supporting device 2 is completed. After the variable height supporting device is formed, filling materials 3 are injected into the mesh bag until the mesh bag 1 is fully expanded and is attached to the contact surfaces of the upper vertebral body and the lower vertebral body.

The mesh bag 1 may be woven from implantable filaments, such as a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, a PGS material, titanium, nitinol, platinum, stainless steel, or cobalt chromium; it may also be a thin film mesh bag made of an implantable material, such as a sintered PTFE thin film mesh bag. Referring to fig. 17, the mesh bag 1 changes the knitting process during the knitting process to reduce the side aperture and the deformation, so as to increase the circumferential strength of the mesh bag 1 and to define the forming shape of the mesh bag 1. Alternatively, the mesh bag may be formed by repeating the weaving of the outer periphery to increase the strength of the outer periphery, so as to increase the strength of the mesh bag 1 in the circumferential direction and to define the shape of the mesh bag 1. Alternatively, referring to fig. 18, the mesh bag 1 adjusts the side gap by changing the diameter of the braided wire, so as to increase the circumferential strength of the mesh bag 1 and define the forming shape of the mesh bag 1. Or the mesh bag 1 is woven by selecting the weaving wire rod side surface with the elasticity modulus larger than that of the weaving wire rod of the vertebral body contact surface, so that the increase of the circumferential strength of the mesh bag 1 and the limitation of the forming shape of the mesh bag 1 are realized. By pushing the filling material 2 into the collapsible mesh bag 1, the fusion system can be made to adapt steplessly to different vertebral body spaces. The increase of the circumferential strength of the mesh bag can effectively prevent the risk of bone leakage after operation; the limitation of the forming shape of the mesh bag eliminates the potential safety hazard of extruding peripheral tissues and nerves due to over expansion caused by no limitation in the forming process of the mesh bag in the operation, and is favorable for the safety in the forming process of the mesh bag in the operation.

The variable height support device 2 is an implantable metal material or a polymer material, and the variable height support device 2 is a deformable structure which is tubular in an initial state and can be radially expanded through axial compression. As shown in fig. 2, the variable height support means 2 has a single variable height support means single layer structure, and as shown in fig. 3, the variable height support means 2 has a single variable height support means multi-layer structure. As shown in fig. 2 and 3, the molded vertebral body contact surface of the variable height support device 2 is curved or flat in a direction perpendicular to the vertebral body contact surface.

The filling material 3 is a bone filling material, such as autologous bone, allogeneic bone or artificial bone. The mechanical property of the filling material 2 is similar to that of a vertebral body bone, after the mesh bag 1 is filled with the filling material 3, stable support can be provided between the upper vertebral body and the lower vertebral body, a large fusion area is provided, and the filling material is filled according to the proportion by using bone filling materials with different structures and particle sizes, so that a better support effect and a better fusion effect can be provided.

Example 2

The outer pipe of the multi-variable-height supporting device is limited, and the buckle is locked axially:

as shown in fig. 5, the percutaneous intervertebral fusion system is composed of a mesh bag 1, a variable height supporting device 2 and a filling material 3, wherein the mesh bag 1 is arranged on the variable height supporting device 2, and an axial locking device 6 is arranged in the variable height supporting device 2. The height-variable supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, the proximal end of the fusion device is contacted with the push tube 41, and the distal end is detachably connected with the inner fixing piece 42.

After entering the intervertebral space through the working channel, the outer tube 43 is withdrawn backwards, freeing a length of the tubular variable height support device 2, as shown in figure 10. As shown in fig. 11, the variable-height supporting device 2 is axially pushed to the far end by the pushing tube 41, so that a section of the variable-height supporting device 2 exposed outside the outer tube 43 is radially expanded, after the forming is finished, the outer tube 43 is continuously withdrawn, a section of the variable-height supporting device 2 is released, the variable-height supporting device 2 is radially expanded by the pushing tube 41, and the steps are repeated until the fusion cage variable-height supporting device 2 is completely formed, as shown in fig. 7, the axial locking device 6 is an automatic locking snap locking mechanism, and the axial locking is finished when the variable-height supporting device is formed. After the variable height supporting device is formed, filling materials 3 are injected into the mesh bag until the mesh bag 1 is fully expanded and is attached to the contact surfaces of the upper vertebral body and the lower vertebral body.

The mesh bag 1 may be woven from implantable filaments, such as a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, a PGS material, titanium, nitinol, platinum, stainless steel, or cobalt chromium; it may also be a thin film mesh bag made of an implantable material, such as a sintered PTFE thin film mesh bag. Referring to fig. 17, the mesh bag 1 changes the knitting process during the knitting process to reduce the side aperture and the deformation, so as to increase the circumferential strength of the mesh bag 1 and to define the forming shape of the mesh bag 1. Alternatively, the mesh bag may be formed by repeating the weaving of the outer periphery to increase the strength of the outer periphery, so as to increase the strength of the mesh bag 1 in the circumferential direction and to define the shape of the mesh bag 1. Alternatively, referring to fig. 18, the mesh bag 1 adjusts the side gap by changing the diameter of the braided wire, so as to increase the circumferential strength of the mesh bag 1 and define the forming shape of the mesh bag 1. Or the mesh bag 1 is woven by selecting the weaving wire rod side surface with the elasticity modulus larger than that of the weaving wire rod of the vertebral body contact surface, so that the increase of the circumferential strength of the mesh bag 1 and the limitation of the forming shape of the mesh bag 1 are realized. By pushing the filling material 2 into the collapsible mesh bag 1, the fusion system can be made to adapt steplessly to different vertebral body spaces. The increase of the circumferential strength of the mesh bag can effectively prevent the risk of bone leakage after operation; the limitation of the forming shape of the mesh bag eliminates the potential safety hazard of extruding peripheral tissues and nerves due to over expansion caused by no limitation in the forming process of the mesh bag in the operation, and is favorable for the safety in the forming process of the mesh bag in the operation.

The variable height support device 2 is an implantable metal material or a polymer material, and the variable height support device 2 is a deformable structure which is tubular in an initial state and can be radially expanded through axial compression. As shown in fig. 5, the variable height supporting device 2 is disposed outside the mesh bag 1, and as shown in fig. 6, the variable height supporting device 2 is disposed inside the mesh bag 1. As shown in fig. 5 and 6, the molded vertebral body contact surface of the variable height support device 2 is curved or flat in a direction perpendicular to the vertebral body contact surface.

The filling material 3 is a bone filling material, such as autologous bone, allogeneic bone or artificial bone. The mechanical property of the filling material 2 is similar to that of a vertebral body bone, after the mesh bag 1 is filled with the filling material 3, stable support can be provided between the upper vertebral body and the lower vertebral body, a large fusion area is provided, and the filling material is filled according to the proportion by using bone filling materials with different structures and particle sizes, so that a better support effect and a better fusion effect can be provided.

As shown in fig. 7, the axial locking device 6 is a snap locking structure, and includes a snap tube 61, the snap tube 61 is disposed inside the variable-height supporting device 2, after the variable-height supporting device 2 is molded, a fixture block 63 on the snap tube 61 contacts with a matched fixture groove 62, so as to axially lock the axial direction of the variable-height supporting device 2, so that the fusion cage variable-height supporting device 2 is more structurally stable, and a good fusion environment is created.

Example 3

The thickness of the variable high supporting device of the multi-variable high supporting device is as follows, the buckle is locked axially:

as shown in fig. 5, the percutaneous intervertebral fusion system is composed of a mesh bag 1, a variable height supporting device 2 and a filling material 3, wherein the mesh bag 1 is arranged on the variable height supporting device 2, and an axial locking device 6 is arranged in the variable height supporting device 2. The height-variable supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, the proximal end of the fusion device is contacted with the push tube 41, and the distal end is detachably connected with the inner fixing piece 42.

After entering the intervertebral space through the working channel, the outer tube 43 is withdrawn backwards, completely freeing the tubular variable height support device 2, as shown in figure 12; as shown in fig. 13 and 14, the pushing tube 41 is used to axially push the variable-height supporting device 2 towards the distal end, the variable-height supporting device 2 exposed outside the outer tube 43 is radially expanded, and since the middle section of the variable-height supporting device near the distal end is thinner than the middle section of the variable-height supporting device near the proximal end, when the pushing tube 41 is used to axially push the variable-height supporting device 2 towards the distal end, the variable-height supporting device at the distal end is formed first, and the pushing tube 41 is continuously used to axially push the variable-height supporting device 2 towards the distal end until the fusion cage variable-height supporting device 2 is completely formed. As shown in fig. 7, the axial locking device 6 is a snap locking structure with automatic axial locking, and the axial locking is completed when the variable height support device 2 is molded. After the variable height supporting device 2 is formed, the filling material 3 is injected into the mesh bag until the mesh bag 1 is fully expanded and is jointed with the contact surfaces of the upper and lower vertebrae.

The mesh bag 1 may be woven from implantable filaments, such as a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, a PGS material, titanium, nitinol, platinum, stainless steel, or cobalt chromium; it may also be a thin film mesh bag made of an implantable material, such as a sintered PTFE thin film mesh bag. Referring to fig. 17, the mesh bag 1 changes the knitting process during the knitting process to reduce the side aperture and the deformation, so as to increase the circumferential strength of the mesh bag 1 and to define the forming shape of the mesh bag 1. Alternatively, the mesh bag may be formed by repeating the weaving of the outer periphery to increase the strength of the outer periphery, so as to increase the strength of the mesh bag 1 in the circumferential direction and to define the shape of the mesh bag 1. Alternatively, referring to fig. 18, the mesh bag 1 adjusts the side gap by changing the diameter of the braided wire, so as to increase the circumferential strength of the mesh bag 1 and define the forming shape of the mesh bag 1. Or the mesh bag 1 is woven by selecting the weaving wire rod side surface with the elasticity modulus larger than that of the weaving wire rod of the vertebral body contact surface, so that the increase of the circumferential strength of the mesh bag 1 and the limitation of the forming shape of the mesh bag 1 are realized. By pushing the filling material 2 into the collapsible mesh bag 1, the fusion system can be made to adapt steplessly to different vertebral body spaces. The increase of the circumferential strength of the mesh bag can effectively prevent the risk of bone leakage after operation; the limitation of the forming shape of the mesh bag eliminates the potential safety hazard of extruding peripheral tissues and nerves due to over expansion caused by no limitation in the forming process of the mesh bag in the operation, and is favorable for the safety in the forming process of the mesh bag in the operation.

The variable height support device 2 is an implantable metal material or a polymer material, and the variable height support device 2 is a deformable structure which is tubular in an initial state and can be radially expanded through axial compression. As shown in fig. 5, the variable height supporting device 2 is disposed outside the mesh bag 1, and as shown in fig. 6, the variable height supporting device 2 is disposed inside the mesh bag 1. As shown in fig. 5 and 6, the molded vertebral body contact surface of the variable height support device 2 is curved or flat in a direction perpendicular to the vertebral body contact surface.

The filling material 3 is a bone filling material, such as autologous bone, allogeneic bone or artificial bone. The mechanical property of the filling material 2 is similar to that of a vertebral body bone, after the mesh bag 1 is filled with the filling material 3, stable support can be provided between the upper vertebral body and the lower vertebral body, a large fusion area is provided, and the filling material is filled according to the proportion by using bone filling materials with different structures and particle sizes, so that a better support effect and a better fusion effect can be provided.

As shown in fig. 7, the axial locking device 6 is a snap locking structure, and includes a snap tube 61, the snap tube 61 is disposed inside the variable-height supporting device 2, after the variable-height supporting device 2 is molded, a fixture block 63 on the snap tube 61 contacts with a matched fixture groove 62, so as to axially lock the axial direction of the variable-height supporting device 2, so that the fusion cage variable-height supporting device 2 is more structurally stable, and a good fusion environment is created.

Example 4

The outer pipe of the multi-variable-height supporting device is limited, and the threads are axially locked:

as shown in fig. 5, the percutaneous intervertebral fusion system is composed of a mesh bag 1, a variable height supporting device 2 and a filling material 3, wherein the mesh bag 1 is arranged on the variable height supporting device 2, and a lining core 64 is arranged in the variable height supporting device 2. The far end of the lining core 64 is fixedly connected with the far end of the variable height supporting device and sleeved outside the inner fixing piece 42, the variable height supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, the near end of the fusion device is contacted with the push tube 41, and the far end is detachably connected with the inner fixing piece 42.

After entering the intervertebral space through the working channel, the outer tube 43 is withdrawn backwards, releasing the length of tubular variable height support device 2, as shown in figure 10; as shown in fig. 11, the variable-height supporting device 2 is axially pushed towards the far end by the pushing tube 41, so that a section of the variable-height supporting device 2 exposed outside the outer tube 43 is radially expanded, after the formation is finished, the outer tube 43 is continuously withdrawn, a section of the variable-height supporting device 2 is released, the pushing tube 41 is used for radially expanding the variable-height supporting device 2, and the steps are repeated until the fusion cage variable-height supporting device 2 is completely formed. As shown in fig. 9, after the variable height support device 2 is molded, the threaded sleeve 65 screwed into the axial locking device 6 performs axial locking. And finally, filling the filling material 3 into the mesh bag until the mesh bag 1 is fully expanded and is attached to the contact surfaces of the upper and lower vertebrae.

The mesh bag 1 may be woven from implantable filaments, such as a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, a PGS material, titanium, nitinol, platinum, stainless steel, or cobalt chromium; it may also be a thin film mesh bag made of an implantable material, such as a sintered PTFE thin film mesh bag. Referring to fig. 17, the mesh bag 1 changes the knitting process during the knitting process to reduce the side aperture and the deformation, so as to increase the circumferential strength of the mesh bag 1 and to define the forming shape of the mesh bag 1. Alternatively, the mesh bag may be formed by repeating the weaving of the outer periphery to increase the strength of the outer periphery, so as to increase the strength of the mesh bag 1 in the circumferential direction and to define the shape of the mesh bag 1. Alternatively, referring to fig. 18, the mesh bag 1 adjusts the side gap by changing the diameter of the braided wire, so as to increase the circumferential strength of the mesh bag 1 and define the forming shape of the mesh bag 1. Or the mesh bag 1 is woven by selecting the weaving wire rod side surface with the elasticity modulus larger than that of the weaving wire rod of the vertebral body contact surface, so that the increase of the circumferential strength of the mesh bag 1 and the limitation of the forming shape of the mesh bag 1 are realized. By pushing the filling material 2 into the collapsible mesh bag 1, the fusion system can be made to adapt steplessly to different vertebral body spaces. The increase of the circumferential strength of the mesh bag can effectively prevent the risk of bone leakage after operation; the limitation of the forming shape of the mesh bag eliminates the potential safety hazard of extruding peripheral tissues and nerves due to over expansion caused by no limitation in the forming process of the mesh bag in the operation, and is favorable for the safety in the forming process of the mesh bag in the operation.

The variable height support device 2 is an implantable metal material or a polymer material, and the variable height support device 2 is a deformable structure which is tubular in an initial state and can be radially expanded through axial compression. As shown in fig. 1, the variable height supporting device 2 is disposed outside the mesh bag 1, and as shown in fig. 3, the variable height supporting device 2 is disposed inside the mesh bag 1. As shown in fig. 3 and 4, the molded vertebral body contact surface of the variable height support device 2 is curved or flat in a direction perpendicular to the vertebral body contact surface.

The filling material 3 is a bone filling material, such as autologous bone, allogeneic bone or artificial bone. The mechanical property of the filling material 2 is similar to that of a vertebral body bone, after the mesh bag 1 is filled with the filling material 3, stable support can be provided between the upper vertebral body and the lower vertebral body, a large fusion area is provided, and the filling material is filled according to the proportion by using bone filling materials with different structures and particle sizes, so that a better support effect and a better fusion effect can be provided.

As shown in fig. 9, the axial locking device 6 is a threaded axial locking device, and is composed of a lining core 64 and a threaded sleeve 65, and the threaded sleeve 65 is in threaded fit with the proximal end of the lining core 64 arranged in the variable-height supporting device 2 to axially lock the variable-height supporting device 2, so that the variable-height supporting device 2 of the fusion cage is more structurally stable, and a good fusion environment is created.

Example 5

The thickness of the multi-variable-height supporting device is variable, and the threads are axially locked:

as shown in fig. 5, the mesh bag fusion cage with the variable height supporting device is composed of a mesh bag 1, a variable height supporting device 2 and a filling material 3, wherein the mesh bag 1 is arranged on the variable height supporting device 2, and an inner lining core 64 is arranged in the variable height supporting device 2. The far end of the lining core 64 is fixedly connected with the far end of the variable height supporting device and sleeved outside the inner fixing piece 42, the variable height supporting device 2 and the mesh bag 1 are pre-contracted in the outer tube 43, the near end of the fusion device is contacted with the push tube 41, and the far end is detachably connected with the inner fixing piece 42.

After entering the intervertebral space through the working channel, as shown in fig. 12, the outer tube 43 is withdrawn backwards, the tubular variable height support device 2 is completely released, as shown in fig. 13 and 14, the variable height support device 2 is pushed axially towards the distal end by the push tube 41, the variable height support device 2 exposed outside the outer tube 43 expands radially, because the middle section of the variable height support device near the distal end is thinner than the middle section of the variable height support device near the proximal end, when the push tube 41 pushes the variable height support device 2 axially towards the distal end, the variable height support device at the distal end is formed first, and the push tube 41 continues to push the variable height support device 2 axially towards the distal end until the fusion cage variable height support device 2 is completely formed. As shown in fig. 9, after the variable height support device 2 is molded, the threaded sleeve 65 screwed into the axial locking device 6 performs axial locking. Finally, filling material 3 is injected into the mesh bag until the mesh bag 1 is fully expanded and is attached to the contact surfaces of the upper and lower vertebrae.

The mesh bag 1 may be woven from implantable filaments, such as a PET wire, a PP material, a PEEK material, a PTFE material, an ultra-high molecular polyethylene, a PGA material, a PLA material, a PCL material, a PGS material, titanium, nitinol, platinum, stainless steel, or cobalt chromium; it may also be a thin film mesh bag made of an implantable material, such as a sintered PTFE thin film mesh bag. Referring to fig. 17, the mesh bag 1 changes the knitting process during the knitting process to reduce the side aperture and the deformation, so as to increase the circumferential strength of the mesh bag 1 and to define the forming shape of the mesh bag 1. Alternatively, the mesh bag may be formed by repeating the weaving of the outer periphery to increase the strength of the outer periphery, so as to increase the strength of the mesh bag 1 in the circumferential direction and to define the shape of the mesh bag 1. Alternatively, referring to fig. 18, the mesh bag 1 adjusts the side gap by changing the diameter of the braided wire, so as to increase the circumferential strength of the mesh bag 1 and define the forming shape of the mesh bag 1. Or the mesh bag 1 is woven by selecting the weaving wire rod side surface with the elasticity modulus larger than that of the weaving wire rod of the vertebral body contact surface, so that the increase of the circumferential strength of the mesh bag 1 and the limitation of the forming shape of the mesh bag 1 are realized. By pushing the filling material 2 into the collapsible mesh bag 1, the fusion system can be made to adapt steplessly to different vertebral body spaces. The increase of the circumferential strength of the mesh bag can effectively prevent the risk of bone leakage after operation; the limitation of the forming shape of the mesh bag eliminates the potential safety hazard of extruding peripheral tissues and nerves due to over expansion caused by no limitation in the forming process of the mesh bag in the operation, and is favorable for the safety in the forming process of the mesh bag in the operation.

The variable height support device 2 is an implantable metal material or a polymer material, and the variable height support device 2 is a deformable structure which is tubular in an initial state and can be radially expanded through axial compression. As shown in fig. 1, the variable height supporting device 2 is disposed outside the mesh bag 1, and as shown in fig. 3, the variable height supporting device 2 is disposed inside the mesh bag 1. As shown in fig. 3 and 4, the molded vertebral body contact surface of the variable height support device 2 is curved or flat in a direction perpendicular to the vertebral body contact surface.

The filling material 3 is a bone filling material, such as autologous bone, allogeneic bone or artificial bone. The mechanical property of the filling material 2 is similar to that of a vertebral body bone, after the mesh bag 1 is filled with the filling material 3, stable support can be provided between the upper vertebral body and the lower vertebral body, a large fusion area is provided, and the filling material is filled according to the proportion by using bone filling materials with different structures and particle sizes, so that a better support effect and a better fusion effect can be provided.

As shown in fig. 9, the axial locking device 6 is a threaded axial locking device, and is composed of a lining core 64 and a threaded sleeve 65, and the threaded sleeve 65 is in threaded fit with the proximal end of the lining core 64 arranged in the variable-height supporting device 2 to axially lock the variable-height supporting device 2, so that the variable-height supporting device 2 of the fusion cage is more structurally stable, and a good fusion environment is created.

The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims (16)

1. A percutaneous intervertebral fusion system comprising: mesh bag (1), at least one variable height strutting arrangement (2), filler material (3) and adjusting device (4), mesh bag (1) have at least one end fixed connection in variable height strutting arrangement (2) are last, mesh bag (1) parcel is in variable height strutting arrangement (2) are outer or be located a plurality of variable height strutting arrangement (2) between, variable height strutting arrangement (2) with adjusting device (4) can be dismantled and be connected, operate adjusting device (4), realize the radial height change of variable height strutting arrangement (2), filler material (3) pass through adjusting device (4) are implanted in mesh bag (1).

2. The percutaneous intervertebral fusion system according to claim 1, further comprising a support rod (5) in lateral contact with the vertebral body plane, the support rod (5) being connected to a tip portion of the variable height support device (2).

3. Percutaneous intervertebral fusion system according to claim 2, characterized in that the support rod (5) consists of a plurality of rods connected to form a diamond-shaped support surface.

4. Percutaneous intervertebral fusion system according to claim 2, characterized in that the support rod (5) is rotatably hinged to the variable height support device (2).

5. The percutaneous intervertebral fusion system of claim 2, wherein the support rod (5) is a unitary structure with a variable height support device.

6. Percutaneous intervertebral fusion system according to claim 2, characterized in that the support rods (5) are provided with a protuberance or barb structure.

7. Percutaneous intervertebral fusion system according to claim 1, characterized in that the proximal end of the variable high support device (2) is internally provided with a one-way valve.

8. Percutaneous intervertebral fusion system according to claim 1, characterized in that an axial locking device (6) is provided inside the variable height support device (2), the axial locking device (6) being an automatic axial locking device or a manual axial locking device.

9. The percutaneous intervertebral fusion system of claim 8 wherein the automatic axial locking device is a locking structure comprising at least a pair of snaps and the manual axial locking device is a threaded locking structure.

10. Percutaneous intervertebral fusion system according to claim 1, characterized in that the variable height support device (2) comprises at least one multi-rod support structure arranged along an axis.

11. The percutaneous intervertebral fusion system of claim 10 wherein the multi-rod support structure comprises at least one pair of rotatable hinge rods that are axially compressed and radially expanded in an arcuate shape.

12. The percutaneous intervertebral fusion system of claim 1, wherein the mesh bag (1) is a porous capsular bag structure, which is a woven or hot-melt formed mesh bag structure of a flexible material.

13. The percutaneous intervertebral fusion system of claim 12 wherein the flexible material is a polymeric material, a metallic material, or a hybrid material of both.

14. The percutaneous intervertebral fusion system of claim 13, wherein the polymer material is a PET wire, a PP material, a PEEK material, a PTFE material, an ultra high molecular polyethylene, a PGA material, a PLA material, a PCL material, or a PGS material, and the metal material is titanium, nitinol, platinum, stainless steel, or cobalt chromium.

15. The percutaneous interbody fusion system of claim 12, wherein the porous capsular bag structure restricts the shape of the mesh bag (1) after intervertebral expansion molding by changing a knitting process, or by repeating the knitting process on the periphery, or by changing the diameter of the knitting thread, or by the nature of the material itself during the knitting process.

16. The percutaneous intervertebral fusion system as claimed in claim 1, wherein the adjusting device (4) comprises a push tube (41), an inner fixing member (42), an outer tube (43) and an adjusting handle (44), the distal end of the variable-height supporting device (2) is detachably and fixedly connected with the distal end of the inner fixing member (42), and the adjusting handle (44) is operated to realize radial height change of the variable-height supporting device (2).

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