A holding instrument and fusion device assembly

Abstract

The present application relates to the field of medical devices, and in particular to a holding instrument and a fusion device assembly, wherein the holding instrument comprises an adjacent core shaft and a first drive assembly; the first drive assembly is adapted to drive the core shaft to rotate along its axial direction; further comprises a clamping portion and an inner tube adjacent in sequence; the inner tube is sleeved on the core shaft; further comprises a chuck, an outer tube, and a second drive assembly adjacent in sequence; the clamping portion is disposed in the chuck; the outer tube is sleeved on the inner tube; the second drive assembly can drive the outer tube to reciprocate relative to the extension direction of the inner tube; further comprises a positioning assembly, on which a bone surface positioning guide is provided. The present invention achieves fixation of the fusion device holder and the fusion device by connecting the core shaft to the fusion device, and prevents loosening of the core shaft connection during surgery by clamping the clamping portion; achieves positioning of the instrument during surgery by the positioning assembly, and controls the bending of the first flexible segment, the second flexible segment, and the third flexible segment by pulling the guide wire by the third drive assembly to adjust the placement angle of the fusion device.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a holding device and a fusion device assembly. Background Art

[0002] TLIF (Transforaminal Lumbar Interbody Fusion) refers to a transforaminal lumbar interbody fusion procedure. Because it is performed through a midline incision on the lateral side of the patient's spinal canal, this procedure significantly reduces the amount of muscle dissection required during surgery. TLIF also provides support and stability to the anterior column, reestablishing the normal anatomical curvature of the corresponding segment, thereby maintaining or restoring the overall physiological curvature of the lumbar spine.

[0003] With the development of 3D printing technology, personalized fusion devices are increasingly accepted by doctors. Their design matches the surface morphology of the upper and lower intervertebral end plates, increasing the contact area between the fusion device and the upper and lower intervertebral end plates, making the placement more stable. At the same time, the changes in the cone posture after placement of the fusion device can be consistent with the preoperative plan, thereby improving the surgical effect.

[0004] However, the fusion device and its holder currently used in TLIF surgery cannot achieve intraoperative positioning and angle adjustment of the fusion device, resulting in the final support position not fitting the end plate, poor stability, and failure to bring into play the advantages of personalized fusion devices. Some doctors swing the holder back and forth or tap the end of the fusion device during surgery to make the fusion device reach the ideal implantation position. The reciprocating swinging of the holder or tapping the end of the fusion device can easily cause damage to the nerve roots and dural sac, and make the TLIF surgery more complicated. In addition, because the cone end plates are concave, the gap between the two end plates is large in the center and small at the outer edges. For fusion devices whose height is greater than their width, it is easier to implant the fusion device by passing through the gap at the outer edges of the end plates in the width direction. However, after the fusion device is placed in the intervertebral space, it needs to be rotated 90° to be aligned. At this time, the fusion device may rotate relative to the fusion device holding instrument, causing the holding to become loose and the thread to slip.

[0005] In view of this, how to provide a holding instrument for achieving precise positioning of a personalized fusion device and stable holding during transforaminal lumbar interbody fusion surgery is the technical problem to be solved by the present invention. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a holding instrument and a fusion cage assembly to solve the problems in the existing surgery.

[0007] To achieve the above-mentioned purpose and other related purposes, the present application provides a holding instrument, on the one hand, comprising an adjacent core shaft and a first drive assembly; the first drive assembly is suitable for driving the core shaft to rotate along its axial direction; it also includes a clamping portion and an inner tube adjacent in sequence; the inner tube is sleeved on the core shaft; it also includes a chuck, an outer tube and a second drive assembly adjacent in sequence; the clamping portion is arranged in the chuck; the outer tube is sleeved on the inner tube; the second drive assembly can drive the outer tube to reciprocate relative to the extension direction of the inner tube, so that the clamping portion protrudes or retracts the chuck, and the clamping portion is configured to be suitable for opening when the chuck is protruding and closing when the chuck is retracted; it also includes a positioning assembly suitable for sliding in the axial direction relative to the outer tube, and the positioning assembly is provided with a bone surface positioning guide.

[0008] In some embodiments of the present invention, the positioning assembly includes a fifth slide rail provided on the surface of the outer tube and a third slider that can slide along the fifth slide rail. The third slider is provided with a connecting rod, and the connecting rod is hinged to the bone surface positioning guide.

[0009] In some embodiments of the present invention, the bone surface positioning guide includes a positioning rod and a bone surface matching portion; the positioning rod is hinged to the connecting rod, and a positioning tooth is provided at one end of the positioning rod close to the connecting rod, and a limiting rack is provided on the outer tube to cooperate with the positioning tooth.

[0010] In some embodiments of the present invention, the outer tube is provided with a distance mark indicating the sliding position of the positioning rod relative to the limiting rack.

[0011] In some embodiments of the present invention, the core shaft includes a first flexible section; the inner tube is provided with a second flexible section at one end close to the clamping portion; the outer tube is provided with a third flexible section at one end close to the chuck; the first flexible section, the second flexible section and the third flexible section cooperate with each other; and a third drive assembly is also included for driving the third flexible section and driving the first flexible section and the second flexible section to bend.

[0012] In some embodiments of the present invention, a first transmission member and a second transmission member are further symmetrically distributed along the axis of the outer tube, and the third flexible section and the third drive assembly are connected via the first transmission member and the second transmission member.

[0013] In some embodiments of the present invention, the third drive assembly includes a disc and a third drive part hinged to the center of the disc, the disc is respectively provided with a first slide rail and a second slide rail symmetrical relative to the center of the disc, the third drive part is provided with a first slider that can slide along the first slide rail and a second slider that can slide along the second slide rail; the first slider is connected to the first transmission member; the second slider is connected to the second transmission member.

[0014] In some embodiments of the present invention, a first clamping hole is provided on the first sliding block, a first transmission retaining member is provided in the first clamping hole, the first transmission member is connected to the first transmission retaining member and is clamped through the first clamping hole; a third slide rail is also provided on the disc; the first transmission member can slide along the third slide rail with the first transmission retaining member.

[0015] In some embodiments of the present invention, a second clamping hole is provided on the second sliding block, a second transmission retaining member is provided in the second clamping hole, the second transmission member is connected to the second transmission retaining member and is clamped through the second clamping hole; a fourth slide rail is also provided on the disc, and the second transmission member can slide along the fourth slide rail along with the second transmission retaining member.

[0016] In some embodiments of the present invention, the disc is provided with angle scale markings.

[0017] In some embodiments of the present invention, a first transmission member passing hole and a second transmission member passing hole are respectively provided on the third flexible section and / or the outer tube.

[0018] In some embodiments of the present invention, a first threaded section is provided at one end of the core shaft away from the first drive assembly.

[0019] In some embodiments of the present invention, the clamping portion includes two oppositely disposed clamping arms; each of the clamping arms includes an adjacent transition arm and a gripping arm, and each of the transition arms is connected to the second flexible segment.

[0020] In some embodiments of the present invention, a gripping portion connected to the inner tube is further included; the gripping portion is provided with a core shaft passing hole.

[0021] In some embodiments of the present invention, the second driving assembly includes a second driving portion sleeved on the inner tube, and the second driving portion is connected to the outer tube.

[0022] In some embodiments of the present invention, a second threaded section is provided on the inner tube; and a first threaded hole matching the second threaded section is provided on the second driving portion.

[0023] In some embodiments of the present invention, the inner diameter of the second driving part is smaller than the outer diameter of the outer tube.

[0024] In some embodiments of the present invention, the inner diameter of the outer tube matches the outer diameter of the inner tube; and the inner diameter of the inner tube matches the outer diameter of the core shaft.

[0025] On the other hand, the present invention provides a fusion device assembly, comprising the holding instrument as described above and a fusion device that cooperates with the holding instrument. The fusion device comprises a fusion device body, which is provided with a clamping groove that cooperates with the clamping part and a second threaded hole that cooperates with the core shaft.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The gripping instrument and fusion device assembly provided in the embodiments of the present invention can ensure that the gripping instrument and fusion device are placed according to the depth and angle direction planned before surgery by positioning the bone surface through the positioning component; the angle of the intervertebral fusion device is adjusted by the third drive component, so that the fusion device can reach the ideal implantation position, the fusion device is better matched with the cone, the expansion effect of the fusion device is increased, and the patient's physiological curvature recovery effect is improved. The fusion device is fixed and placed by clamping and threaded connection. There is no need to over-tighten the threads to cause the risk of thread slippage, and the threads are prevented from loosening during use, reducing the risk of the fusion device not being able to be properly adjusted after implantation in the intervertebral space. This is especially true for some fusion devices whose width is smaller than their height. Since the cone end plates are concave, the gap between the two end plates is large and the gap at the outer edges is small. The doctor inserts the fusion device vertically between the vertebrae and then rotates it 90° to place it horizontally. With a single threaded connection, since there is no visual field between the vertebrae, it is impossible to effectively determine the rotational state of the fusion device between the vertebrae, and a 90° rotation may cause thread slippage and loosening. The grasping arm of the embodiment of the present invention limits the axial rotation of the fusion device relative to the fusion device holder, can clearly determine the state of the fusion device between the vertebrae, and can effectively prevent thread slippage or loosening. It has the advantages of stable holding, safety and effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the holding device of this application.

[0029] Figure 2 yes Figure 1 Magnified view of part A.

[0030] Figure 3 It is a schematic diagram of the structure of the handle of the present application from a bottom view.

[0031] Figure 4 yes Figure 3 Enlarged view of part B.

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the holding device of this application from one angle.

[0033] Figure 6 yes Figure 5 Enlarged view of part C.

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the clamp and the third flexible section of the present application.

[0035] Figure 8 It is a schematic diagram of the internal structure of the holding device of this application.

[0036] Figure 9 It is a schematic diagram of the main structure of the holding device of this application.

[0037] Figure 10 It is a schematic diagram of the split structure of the fusion device assembly of the present application.

[0038] Figure 11 This is a schematic diagram of the initial state structure of the fusion device assembly of the present application entering the intervertebral space.

[0039] Figure 12 It is a structural diagram of the fusion device assembly of the present application entering the intervertebral space to adjust the angle.

[0040] Component number description

[0041] 1. Holding the instrument

[0042] 11 Mandrel

[0043] 111 First flexible section

[0044] 112 first thread segment

[0045] 12. First drive assembly

[0046] 131 clamping part

[0047] 1311 Transition Arm

[0048] 1312 Grab Arm

[0049] 132 Second flexible section

[0050] 133 inner tube

[0051] 141 chuck

[0052] 142 Third flexible section

[0053] 143 outer tube

[0054] 15 Second drive assembly

[0055] 151 Second drive unit

[0056] 1511 First threaded hole

[0057] 152 Second thread segment

[0058] 16 Third drive assembly

[0059] 161 disc

[0060] 162 Third drive unit

[0061] 1631 First Slide

[0062] 1632 Second slide rail

[0063] 1641 First Slider

[0064] 1642 Second Slider

[0065] 1651 First card hole

[0066] 1652 Second card hole

[0067] 1661 First transmission retainer

[0068] 1662 Second transmission retainer

[0069] 1671 Third Slide Rail

[0070] 1672 Fourth Slide

[0071] 168 Angle scale mark

[0072] 17 Grip

[0073] 171 core shaft through hole

[0074] 181 First transmission member

[0075] 182 Second transmission member

[0076] 183 First transmission member through hole

[0077] 184 Second transmission member through hole

[0078] 19 Positioning components

[0079] 191 Fifth Slide

[0080] 192 Third Slider

[0081] 193 Bone Positioning Guide

[0082] 1931 Positioning Rod

[0083] 1932 Bone-Facial Matching Department

[0084] 194 connecting rod

[0085] 195 positioning tooth

[0086] 196 limit rack

[0087] 2 Fusion device

[0088] 21 Fusion device body

[0089] 22 card slots

[0090] 23 Second threaded hole DETAILED DESCRIPTION

[0091] In the description of this application, it should be noted that the devices, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not intended to limit the limitations of the implementation of this application. Therefore, they have no technical significance. Any modification of the device, change in proportion or adjustment of the size, without affecting the efficacy and purpose of this application, should still fall within the scope of the technical content disclosed in this application. At the same time, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0092] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0093] Furthermore, in the description of the present application, unless otherwise specified, “plurality” means two or more.

[0094] like Figures 1 to 12As shown, an embodiment of the present application provides a holding instrument on the one hand, comprising an adjacent core shaft 11 and a first drive assembly 12; the first drive assembly 12 is suitable for driving the core shaft 11 to rotate along its axial direction; it also includes a clamping portion 131 and an inner tube 133 adjacent in sequence; the inner tube 133 is sleeved on the core shaft 11; it also includes a chuck 141, an outer tube 143 and a second drive assembly 15 adjacent in sequence; the clamping portion 131 is arranged in the chuck 141; the outer tube 143 is sleeved on the inner tube 133; the second drive assembly 15 can drive the outer tube 143 to reciprocate relative to the extension direction of the inner tube 133, so that the clamping portion 131 protrudes or retracts the chuck 141, and the clamping portion 131 is configured to be suitable for opening when the chuck 141 is protruding and closing when the chuck 141 is retracted; it also includes a positioning assembly 19 suitable for sliding in the axial direction relative to the outer tube 143, and the positioning assembly 19 is provided with a bone surface positioning guide 193. Among them, the inner tube 133 and the outer tube 143 are both hollow structures, and are respectively axially penetrated. The inner tube 133 and the clamping part 131 are connected in the axial direction, so that the clamping part 131 can be clamped in conjunction with the clamp 141 to squeeze it. The present invention fixes the fusion device holder and the fusion device by connecting the core shaft 11 to the fusion device, and prevents the loosening of the core shaft connection during the operation by clamping the clamping part; and realizes the positioning of the instrument during the operation by the positioning part. For TLIF surgery, the personalized fusion device is grasped to complete stable and precise implantation, so that the personalized fusion device can reach the ideal implantation position and improve the postoperative recovery effect.

[0095] In the gripping instrument provided by the present invention, the positioning assembly 19 includes a fifth slide rail 191 provided on the surface of the outer tube 143 and a third slider 192 that can slide along the fifth slide rail 191. The third slider 192 is provided with a connecting rod 194, which is hingedly connected to the bone surface positioning guide 193. The fifth slide rail 191 is fixed to the surface of the outer tube 143 and slides along the fifth slide rail 191 through the third slider 192, thereby driving the bone surface positioning guide 193 toward the pre-positioned bone surface. The connecting rod 194 is hingedly connected to the positioning guide, which can further flexibly adjust the position of the bone surface positioning guide 193.

[0096] In the holding device provided by the present invention, Figures 3-5As shown in Figure 9, the bone surface positioning guide 193 includes a positioning rod 1931 and a bone surface matching portion 1932. The bone surface matching portion 1932 is suitable for matching bone surfaces during surgery, such as the transverse process surface. The positioning rod 1931 is hinged to the connecting rod 194, and the positioning rod 1931 is provided with a positioning tooth 195 at one end close to the connecting rod 194, and the outer tube is provided with a limiting rack 196 that matches the positioning tooth 195. The limiting rack 196 is fixed on the outer tube 143, and the extension direction of the limiting rack 196 is consistent with the extension direction of the fifth slide rail 191. In the present application, according to the actual situation of the patient, the depth and angle of the implantation are planned before the operation, and then the positioning component 19 can be personalized, for example, by 3D printing, wherein the bone surface matching portion 1932 is used to fit the transverse process surface. After the third slider 192 slides a certain distance relative to the fifth slide rail 191, the bone surface matching part 1932 is basically in contact with the transverse process surface. Due to the cooperation of the limiting rack 196 and the positioning tooth 195, the bone surface matching part no longer moves and can be well positioned.

[0097] In a preferred embodiment of the holding device provided by the present invention, as Figure 5 and 10 As shown, the fifth slide rail 191 includes two fifth sub-slide rails axially distributed along the outer tube 143. The third slider 192 includes two third sub-slide rails that can slide along the two fifth sub-slide rails, respectively. A connecting rod 194 is used to connect the two third sub-slide rails. The limiting rack 196 can be located between the two fifth sub-slide rails and extend in the same direction as the two fifth sub-slide rails.

[0098] In the holding instrument provided by the present invention, preferably, a distance mark indicating the sliding position of the positioning rod 1931 relative to the limiting rack 196 is provided on the outer tube 143 .

[0099] In the gripping instrument provided by the present application, in a preferred embodiment, the core shaft 11 includes a first flexible segment 111; the end of the inner tube 133 near the clamping portion 131 is provided with a second flexible segment 132; the end of the outer tube 143 near the clamping head 141 is provided with a third flexible segment 142; the first flexible segment 111, the second flexible segment 132, and the third flexible segment 142 cooperate with each other; and the core shaft 111 further includes a third driving assembly 16 for driving the third flexible segment 142 and causing the first flexible segment 111 and the second flexible segment 132 to bend. The cooperation between the first flexible segment 111, the second flexible segment 132, and the third flexible segment 142 specifically means that the second flexible segment 132 axially spans the first flexible segment 111, and the third flexible segment 142 axially spans the second flexible segment 132, so that the first flexible segment 111 and the second flexible segment 132 are driven to bend together with the third flexible segment 142 through the third driving assembly 16. The third driving assembly 16 controls the bending of the first flexible segment 111 , the second flexible segment 132 , and the third flexible segment 142 , thereby achieving adjustable angle of the fusion device.

[0100] In the holding device provided in this application, Figure 8 , further comprising a first transmission member 181 and a second transmission member 182 symmetrically distributed along the axis of the outer tube 143, wherein the third flexible section 142 and the third drive assembly 16 are connected via the first transmission member 181 and the second transmission member 182. Figure 7 The third flexible section 142 and / or the outer tube 143 are provided with first transmission member through holes 183 that cooperate with the first transmission member 181. The first transmission member 181 is connected to the third drive assembly 16 through each of the first transmission member through holes 183. The third flexible section 142 and / or the outer tube 143 are also provided with second transmission member through holes 184 that cooperate with the second transmission member 182. The second transmission member 182 is connected to the third drive assembly 16 through each of the second transmission member through holes 184.

[0101] In the holding device provided in this application, Figure 1 、 5 9, the third driving assembly 16 includes a disk 161 and a third driving portion 162 hinged to the center of the disk 161, as shown Figure 1 Or 5, the disc 161 is provided with a first slide rail 1631 and a second slide rail 1632 symmetrical with respect to the disc center, and the third driving portion 162 is provided with a first slider 1641 that can slide along the first slide rail 1631 and a second slider 1642 that can slide along the second slide rail 1632; Figure 8The first slider 1641 is connected to the first transmission member 181; the second slider 1642 is connected to the second transmission member 182. The first and second transmission members 181, 182 have opposite motion paths within the outer tube. The third driving unit 162 can drive the first and second transmission members 181, 182 to move in opposite directions, thereby controlling the bending of the third flexible segment 142 and causing the first and second flexible segments 111, 132 to bend along with the third flexible segment 142.

[0102] In some embodiments, as Figure 8 The first slider 1641 is provided with a first engaging hole 1651, the first engaging hole 1651 is provided with a first transmission retaining member 1661, the first transmission member 181 is connected to the first transmission retaining member 1661, and is engaged through the first engaging hole 1651; Figure 5 , a third slide rail 1671 is further provided on the disc 161 ; the first transmission member 181 can slide along the third slide rail 1671 along with the first transmission retaining member 1661 .

[0103] In some embodiments, as Figure 8 The second slider 1642 is provided with a second engaging hole 1652, and a second transmission retaining member 1662 is provided in the second engaging hole 1652. The second transmission member 182 is connected to the second transmission retaining member 1662 and is engaged through the second engaging hole 1652. Figure 11 and 12 The disc 161 is further provided with a fourth slide rail 1672 , and the second transmission member 182 can slide along the fourth slide rail 1672 along with the second transmission retaining member 1662 .

[0104] In some embodiments, the first transmission member 181 and the second transmission member 182 may be, for example, first and second guidewires symmetrically distributed along the axial direction of the outer tube 143. One end of the first and second guidewires are symmetrically secured to the end of the first flexible segment 111 near the chuck 141. The first transmission member 181, such as the first guidewire, then passes through the third flexible segment 142 and the first transmission member through-hole 183 in the outer tube 143 to connect with the first transmission retainer 1661 at the other end. The second transmission member 182, such as the guidewire, passes through the third flexible segment 142 and the second transmission member through-hole 184 in the outer tube 143 to connect with the second transmission retainer 1662 at the other end. The first transmission retainer 1661 may be, for example, a first steel ball. The first steel ball is engaged with the first slider 1641 of the third drive unit 162 through the first engaging hole 1651. The second transmission retainer 1662 may be, for example, a second steel ball. The second steel ball is engaged with the second slider 1642 of the third drive unit 162 through the second engaging hole 1652. The third driving portion 162 can be, for example, an operating handle. For example, when the operating handle is pushed to move away from the chuck, the first slider 1641 can slide clockwise along the first slide rail 1631. Simultaneously, the first engaging hole 1651 pushes the first steel ball to slide clockwise on the third slide rail 1671. The first steel ball is fixed to the first guide wire. When the first steel ball slides, it pulls the first guide wire away from the chuck. Simultaneously, the second slider 1642 can slide clockwise along the second slide rail 1632. Simultaneously, the second engaging hole 1652 pushes the second steel ball to slide clockwise on the fourth slide rail 1672. The second steel ball is fixed to the second guide wire. When the second steel ball slides, the second guide wire moves toward the chuck. That is, the first guide wire and the second guide wire move in opposite directions within the outer tube. Thus, the first and second guide wires can be used to control the bending of the third flexible segment 142, thereby driving the first flexible segment 111 and the second flexible segment 132 to bend along with the third flexible segment 142.

[0105] Preferably, the first slide rail 1631, the second slide rail 1632, the third slide rail 1671, and the fourth slide rail 1672 are all arc-shaped slide rails, and are all concentric with the disc 161. The first slide rail 1631 may include two first sub-slide rails, and the first slider 1641 is clamped between the two first sub-slide rails, and the first slider 1641 can slide along the two first sub-slide rails. Similarly, the second slide rail 1632 may also include two second sub-slide rails, and the second slider 1642 is clamped between the two second sub-slide rails, and the second slider 1642 can slide along the second sub-slide rails. More preferably, the third slide rail 1671 is arranged between the two first sub-slide rails, spaced apart from the two first sub-slide rails, and the extension direction is consistent with the two first sub-slide rails. The fourth slide rail 1672 is arranged between the two second sub-slide rails, spaced apart from the two second sub-slide rails, and the extension direction is consistent with the two second sub-slide rails.

[0106] In the gripping device provided herein, the inner diameter of the first engaging hole 1651 is larger than the outer diameter of the first guidewire, the inner diameter of the second engaging hole 1652 is larger than the outer diameter of the second guidewire, the inner diameter of the first engaging hole 1651 is smaller than the diameter of the first steel ball, and the inner diameter of the second engaging hole 1652 is smaller than the diameter of the second steel ball. The inner diameters of the first engaging hole 1651 and the second engaging hole 1652 can be, for example, 0.5 mm to 2 mm. The outer diameters of the first and second guidewires can be 0.5 mm to 2 mm. The diameters of the first and second steel balls can be 0.8 mm to 2.4 mm.

[0107] The first transmission member passes through the hole 183 and docks with the end of the third slide rail 1671 away from the chuck 141, forming a continuous path for the installation and sliding of the first guide wire. The second transmission member passes through the hole 184 and docks with the end of the fourth slide rail 1672 away from the chuck 141, forming a continuous path for the installation and sliding of the second guide wire. The distance that the first steel ball slides on the third slide rail 1671 is the length of the first guide wire pulled and slid, and the distance that the first steel ball slides on the third slide rail 1671 is the product of the angle of rotation of the operating handle around the disk 161 and the radius of the third slide rail 1671. The distance that the second steel ball slides on the fourth slide rail 1672 is the length of the second guide wire pulled and slid, and the distance that the second steel ball slides on the fourth slide rail 1672 is the product of the angle of rotation of the operating handle around the disk 161 and the radius of the fourth slide rail 1672.

[0108] In the holding device provided in this application, Figure 9 The disc 161 is provided with an angle scale mark 168 for marking the bending angle of the third flexible section 142 .

[0109] In the holding device provided in this application, Figure 7 The third flexible section 142 is composed of 3-8 cylindrical thin sheets connected by springs, with the length of the springs perpendicular to the plane of the pair of guidewires. This ensures stable and reliable bending, and the normal to the plane of the outer tube 143's axis remains parallel to the normal to the plane of the two guidewires after bending. The length of the third flexible section can be, for example, 5 mm to 15 mm.

[0110] In some embodiments, the length of the second flexible segment 132 may be, for example, 8 mm to 20 mm. The length of the first flexible segment 111 may be, for example, 10 mm to 25 mm.

[0111] In the holding device provided in this application, Figure 1A first threaded segment 112 is provided on the end of the mandrel 11 away from the first drive assembly 12. The first threaded segment 112 engages with the second threaded hole 23 in the fusion device, thereby connecting the gripping device 1 to the fusion device. The length of the first threaded segment 112 can be, for example, 5 mm to 15 mm, 5 mm to 10 mm, or 10 mm to 15 mm.

[0112] In the holding device provided in this application, Figure 1 The first driving assembly 12 includes a first driving portion. Preferably, the first driving portion can be, for example, a rotating nut.

[0113] In the holding device provided in this application, Figure 1 The clamping portion 131 includes two clamping arms arranged opposite to each other. Each clamping arm includes a connected transition arm 1311 and a grasping arm 1312. Each transition arm 1311 is connected to the second flexible section 132. The transition arm 1311 cooperates with the extrusion surface of the clamp 141, which can squeeze the transition arm 1311. The grasping arm 1312 cooperates with the clamping groove 22 of the fusion device. The angle between the two transition arms 1311 can be, for example, 30° to 120°, 30° to 60°, 60° to 90°, or 90° to 120°. The angle of the clamp 141 can be 25° to 110°, 25° to 55°, 55° to 85°, or 85° to 110°.

[0114] In the holding device provided in this application, Figure 1 , further comprising a grip portion 17 connected to the inner tube 133. In some embodiments, the grip portion 17 is disposed at an end of the inner tube 133 away from the clamping portion 131. The grip portion 17 may generally extend at an angle to the direction of extension of the inner tube 133, for example, perpendicular to the direction of extension of the inner tube 133. The grip portion 17 facilitates gripping.

[0115] In the holding device provided in this application, Figure 1 The grip portion 17 is provided with a core shaft through hole 171. The core shaft through hole 171 is connected to the hollow cavity of the inner tube 133. The core shaft through hole 171 facilitates the passage of the core shaft 11.

[0116] In the holding device provided in this application, Figure 1The second drive assembly 15 includes a second drive portion 151, which is sleeved outside the inner tube 133 and connected to the outer tube 143. During use, the second drive portion 151 drives the outer tube 143 to move relative to the inner tube 133 toward the clamping portion 131. During this movement, the chuck 141 squeezes the clamping portion 131, causing the angle of the clamping portion 131 to gradually decrease, thereby controlling the closure of the clamping portion 131. The second drive portion 151 drives the outer tube 143 assembly to move relative to the inner tube 133 away from the clamping portion 131, thereby resetting the chuck 141 and the clamping portion 131.

[0117] In the holding device provided in this application, Figure 1 The inner tube 133 is provided with a second threaded segment 152, and the driving portion is provided with a first threaded hole 1511 that cooperates with the second threaded segment 152. By rotating the second driving portion 151 through the cooperation between the first threaded hole 1511 and the second threaded segment 152, the second driving portion 151 can drive the outer tube 143 to reciprocate relative to the extension direction of the inner tube 133. In some embodiments, the length of the second threaded segment 152 can be, for example, 10 mm to 30 mm, 10 mm to 20 mm, or 20 mm to 30 mm. The length of the first threaded hole 1511 can be, for example, 5 mm to 25 mm, 5 mm to 15 mm, or 15 mm to 25 mm.

[0118] In the holding device provided in the present application, the clamping portion 131 is configured to be suitable for opening when the clamp 141 is protruding and closing when the clamp 141 is retracted. Specifically, the clamping portion 131 opens when not under force and clamps when under force. In one embodiment, the size of the clamp 141 generally gradually increases from the end connected to the outer tube 143 toward the end away from the outer tube 143, forming a flared structure. The clamp 141 includes two extrusion surfaces, and the angle formed by the extension of the two extrusion surfaces is the angle of the clamp 141. The clamping portion 131 includes two clamping arms, and the angle between the two clamping arms is the angle of the clamping portion 131.

[0119] In the gripping device provided herein, the inner diameter of the second driving portion 151 is smaller than the outer diameter of the outer tube 143. In some embodiments, the outer diameter of the outer tube 143 can be, for example, 4 mm to 10 mm, 4 mm to 6 mm, 6 mm to 8 mm, or 8 mm to 10 mm. The inner diameter of the second driving portion 151 can be, for example, 3 mm to 8 mm, 3 mm to 5 mm, or 5 mm to 8 mm.

[0120] In the gripping instrument provided herein, the inner diameter of the outer tube 143 matches the outer diameter of the inner tube 133. Specifically, the inner diameter of the outer tube 143 is slightly larger than the outer diameter of the inner tube 133. The inner diameter of the inner tube 133 matches the outer diameter of the core shaft 11. Specifically, the inner diameter of the inner tube 133 is slightly larger than the outer diameter of the core shaft 11. The inner diameter of the outer tube 143 can be 3mm to 9mm, 3mm to 6mm, or 6mm to 9mm. The outer diameter of the inner tube 133 can be 3mm to 9mm, 3mm to 6mm, or 6mm to 9mm. The outer diameter of the core shaft 11 can be 2mm to 5mm, 2mm to 3mm, 3mm to 4mm, or 4mm to 5mm.

[0121] like Figure 10 As shown, on the other hand, the present application provides a fusion device assembly, including the holding instrument 11 described in the first aspect of the present application and a fusion device 2 that cooperates with the holding instrument 11, the fusion device 2 includes a fusion device body 21, and the fusion device body 21 is provided with a clamping groove 22 that cooperates with the clamping portion 131 and a second threaded hole 23 that cooperates with the core shaft 11. For intervertebral fusion surgery, the holding device 2 passes through the gap at the outer edge of the end plate in the width direction, and can stably rotate between vertebrae to achieve the ideal implantation position of the fusion device 2, thereby improving the postoperative recovery effect. The present invention is aimed at TLIF surgery, and the holding instrument 1 can be used to complete the stable implantation of the fusion device, and can adjust the angle of the fusion device between the cones to achieve the ideal implantation position of the fusion device, thereby improving the postoperative recovery effect.

[0122] In the fusion device assembly provided in the present application, the diameter of the second threaded hole 23 can be, for example, 2 mm to 5 mm, 2 mm to 3 mm, 3 mm to 4 mm, or 4 mm to 5 mm.

[0123] Typically, the depth and angle of implantation are planned before surgery based on the patient's actual situation, and then, for example, the positioning component 19 can be personalized through 3D printing. All parts except the positioning component are universal components.

[0124] The use process of the fusion device assembly of this application:

[0125] In the fusion device assembly provided in this application, Figures 10-12When in use, first rotate the second drive assembly 15 to push the outer tube 143 toward the clamping part 131, so that the clamp 141 squeezes the clamping part 131 and contracts inward, and the clamping part 131 docks with the clamping groove 22 of the fusion device to form a clamp; then rotate the first drive assembly 12 to screw the first threaded section 112 of the core shaft 11 into the second threaded hole 23 of the fusion device, thereby connecting the fusion device and the holding instrument. The third slider 192 slides along the fifth slide rail 191, thereby driving the bone surface positioning guide plate 193 to move toward the predetermined bone surface, so that the bone surface matching portion 1932 fits the transverse process surface, and at the same time, the cooperation of the limiting rack 196 and the positioning tooth 195 makes the bone surface matching portion no longer move, and unique positioning can be achieved. After the fusion device is placed in the target intervertebral space, the operating handle is pushed through the third drive assembly 16, and the first slider 1641 can slide along the first slide rail 1631. At the same time, the first clamping hole 1651 pushes the first transmission retainer 1661 to slide on the third slide rail 1671. The first transmission member 181 is fixed on the first transmission retainer 1661. When the first transmission retainer 1661 slides, it pulls the first transmission member 181 to move, and the second slider 1642 can slide along the second slide rail 1632, while the second engaging hole 1652 pushes the second transmission retainer 1662 to slide on the fourth slide rail 1672. The second transmission member 182 is fixed to the second transmission retainer 1662. When the second transmission retainer 1662 slides, the second transmission member 182 and the first transmission member 181 move in opposite directions. For example, when the first transmission member 181 moves away from the chuck, the second transmission member 182 moves toward the chuck. Thus, the first transmission member 181 and the second transmission member 182 can control the bending of the third flexible segment 142, driving the first flexible segment 111 and the second flexible segment 132 to bend together with the third flexible segment 142, thereby adjusting the placement angle of the fusion device to the angle planned before surgery, thereby achieving the ideal implantation position of the fusion device. When withdrawing, first reversely rotate the first drive assembly 12 so that the second threaded segment 152 of the core shaft 11 withdraws from the second threaded hole 23 of the fusion device, then reversely rotate the second drive assembly 15, loosen the grasping arm 1312, release the fusion device, and finally straighten the first flexible segment 111, the second flexible segment 132, and the third flexible segment 142 of the fusion device holder through the third drive assembly 16 and withdraw from the affected intervertebral space. The bone surface matching portion 1932 of the positioning assembly 19 also leaves the bone surface during this process.

[0126] In summary, the holding instrument provided in the embodiment of the present invention can ensure that the holding instrument and the fusion device are placed according to the depth and angle direction planned before surgery by positioning the bone surface through the positioning component 19; the angle of the intervertebral fusion device is adjusted by the third drive component, so that the fusion device can reach the ideal implantation position, the fusion device is better matched with the cone, the expansion effect of the fusion device is increased, and the patient's physiological curvature recovery effect is improved. The fusion device is fixed and placed by clamping and threaded connection. There is no need to over-tighten the threads to cause the risk of thread slippage, and the threads are prevented from loosening during use, reducing the risk of the fusion device not being able to be properly adjusted after implantation in the intervertebral space. This is especially true for some fusion devices whose width is smaller than their height. Since the cone end plates are concave, the gap between the two end plates is large and the gap at the outer edges is small. The doctor inserts the fusion device vertically between the vertebrae and then rotates it 90° to place it horizontally. With a single threaded connection, since there is no visual field between the vertebrae, it is impossible to effectively determine the rotational state of the fusion device between the vertebrae, and a 90° rotation may cause thread slippage and loosening. The grasping arm of the embodiment of the present invention limits the axial rotation of the fusion device relative to the fusion device holder, can clearly determine the state of the fusion device between the vertebrae, and can effectively prevent thread slippage or loosening. It has the advantages of stable holding, safety and effectiveness.

[0127] In summary, the present application effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0128] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A holding device, characterized in that: It comprises an adjacent core shaft (11) and a first drive assembly (12); the first drive assembly (12) is suitable for driving the core shaft (11) to rotate along its axial direction; The invention also includes a clamping portion (131) and an inner tube (133) adjacent to each other in sequence; the inner tube (133) is sleeved on the core shaft (11); and further includes a chuck (141), an outer tube (143) and a second drive assembly (15) adjacent to each other in sequence; the clamping portion (131) is arranged in the chuck (141); the outer tube (143) is sleeved on the inner tube (133); the second drive assembly (15) can drive the outer tube (143) to reciprocate relative to the extension direction of the inner tube (133), so that the clamping portion (131) protrudes or retracts into the chuck (141), and the clamping portion (131) is configured to be suitable for opening when the chuck (141) is protruded and closing when the chuck (141) is retracted; It also includes a positioning assembly (19) adapted to slide in the axial direction relative to the outer tube (143), wherein the positioning assembly (19) is provided with a bone surface positioning guide plate (193); The positioning assembly (19) includes a fifth slide rail (191) provided on the surface of the outer tube (143) and a third slider (192) that can slide along the fifth slide rail (191); the third slider (192) is provided with a connecting rod (194); the connecting rod (194) is hinged to the bone surface positioning guide plate (193); The bone surface positioning guide plate (193) comprises a positioning rod (1931) and a bone surface matching portion (1932); the positioning rod (1931) is hinged to the connecting rod (194); one end of the positioning rod (1931) close to the connecting rod (194) is provided with a positioning tooth (195); and the outer tube (143) is provided with a limiting rack (196) that matches the positioning tooth (195); A first threaded section (112) is provided at one end of the core shaft (11) away from the first drive assembly (12).

2. The holding device according to claim 1, wherein: The outer tube (143) is provided with a distance mark indicating the sliding position of the positioning rod (1931) relative to the limiting rack (196).

3. The holding device according to claim 1, wherein: The core shaft (11) includes a first flexible section (111); a second flexible section (132) is provided at one end of the inner tube (133) close to the clamping portion (131); a third flexible section (142) is provided at one end of the outer tube (143) close to the clamping head (141); the first flexible section (111), the second flexible section (132) and the third flexible section (142) cooperate with each other; and a third driving assembly (16) is also included for driving the third flexible section (142) and causing the first flexible section (111) and the second flexible section (132) to bend.

4. The holding device according to claim 3, wherein: It also includes a first transmission member (181) and a second transmission member (182) symmetrically distributed along the axial direction of the outer tube (143), and the third flexible section (142) and the third drive assembly (16) are connected via the first transmission member (181) and the second transmission member (182); And / or, the third flexible section (142) and / or the outer tube (143) are respectively provided with a first transmission member through hole (183) and a second transmission member through hole (184).

5. The holding device according to claim 4, wherein: The third driving assembly (16) includes a disc (161) and a third driving portion (162) hinged to the center of the disc (161); the disc (161) is provided with a first slide rail (1631) and a second slide rail (1632) symmetrical with respect to the center of the disc; the third driving portion (162) is provided with a first slider (1641) that can slide along the first slide rail (1631) and a second slider (1642) that can slide along the second slide rail (1632); the first slider (1641) is connected to the first transmission member (181); and the second slider (1642) is connected to the second transmission member (182).

6. The holding device according to claim 5, wherein: The first slider (1641) is provided with a first engaging hole (1651), a first transmission retaining member (1661) is provided in the first engaging hole (1651), the first transmission member (181) is connected to the first transmission retaining member (1661) and is engaged through the first engaging hole (1651); the disc (161) is further provided with a third slide rail (1671); the first transmission member (181) can slide along the third slide rail (1671) along with the first transmission retaining member (1661); And / or, a second engaging hole (1652) is provided on the second sliding block (1642), a second transmission retaining member (1662) is provided in the second engaging hole (1652), the second transmission member (182) is connected to the second transmission retaining member (1662) and is engaged through the second engaging hole (1652); a fourth slide rail (1672) is further provided on the disc (161), and the second transmission member (182) can slide along the fourth slide rail (1672) along with the second transmission retaining member (1662); And / or, the disc (161) is provided with an angle scale mark (168).

7. The holding device according to claim 1, wherein: The clamping portion (131) comprises two clamping arms arranged opposite to each other; each clamping arm comprises an adjacent transition arm (1311) and a gripping arm (1312), and each transition arm (1311) is connected to the inner tube (133). And / or, the holding device further comprises a holding portion (17) connected to the inner tube (133); the holding portion (17) is provided with a core shaft through hole (171); And / or, the second drive assembly (15) comprises a second drive portion (151) sleeved on the inner tube (133), and the second drive portion (151) is connected to the outer tube (143).

8. The holding device according to claim 7, wherein: The inner tube (133) is provided with a second threaded section (152); the second driving portion (151) is provided with a first threaded hole (1511) that matches the second threaded section (152); And / or, the inner diameter of the second driving part (151) is smaller than the outer diameter of the outer tube (143).

9. A fusion cage assembly, characterized in that: The invention comprises a holding instrument (1) as claimed in any one of claims 1 to 8 and a fusion device (2) matched with the holding instrument (1), wherein the fusion device (2) comprises a fusion device body (21), and the fusion device body (21) is provided with a clamping groove (22) matched with the clamping portion (131) and a second threaded hole (23) matched with the core shaft (11).

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