Vertebral canaloplasty device

Abstract

The present invention relates to a vertebral channel shaping device, comprising: a mounting sleeve; an external fixing member, which is sleeved in the mounting sleeve and can move along the length direction of the mounting sleeve; an internal fixing member, which is placed in the accommodating cavity and can move along the length direction of the external fixing member; a nesting component, comprising a sleeved outer sleeve and an inner sleeve, wherein the outer sleeve is connected to the external fixing member, the inner sleeve is connected to the inner fixing member, and the distal end of the outer sleeve is connected to the distal end of the inner sleeve, and one side of the circumferential surface of the inner sleeve forms a shrinkable structure that can shrink when subjected to pressure in the length direction to bend and deform the inner sleeve; the external fixing member and the internal fixing member can move in two opposite directions along the length direction of the mounting sleeve, respectively. This embodiment can ensure low leakage and reduce the amount of bone cement used.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, in particular to a vertebral channel shaping device. Background Art

[0002] When the human spine collapses and deforms, vertebroplasty surgery is required, which uses vertebroplasty tools to create a channel in the spine and inject bone cement into the channel.

[0003] In actual implementation, according to the actual situation of the patient, the operation types of using vertebroplasty tools to establish channels are generally divided into unilateral and bilateral approaches to establish channels. When the vertebral body collapses unilaterally, the unilateral approach is generally used, and when the vertebral body collapses as a whole, the bilateral approach is used. According to research, these two operation methods have their own advantages and disadvantages. Among them, in the unilateral approach operation method, since only one side is incised, the bone cement leakage rate is significantly lower than the bone cement leakage rate of the bilateral approach, and the operation time is short. However, since the channel formed is linear, some collapsed areas cannot be covered; in the bilateral approach, since the channel is set on both sides, it can cover all collapsed positions. However, the bilateral approach means that at least two incisions need to be made, the bone cement leakage rate is high, the operation time is long, and the opening of two incisions also brings greater trauma to the patient, and the postoperative recovery time is long. Summary of the invention

[0004] Based on this, it is necessary to provide a vertebral channel shaping device to address the problem that the traditional way of establishing a vertebral channel is difficult to ensure low leakage and low bone cement usage at the same time.

[0005] A vertebral canal shaping device, comprising:

[0006] Install the casing;

[0007] An external fixing member is sleeved in the installation sleeve and can move along the length direction of the installation sleeve, and the external fixing member is provided with a receiving cavity;

[0008] An internal fixing member, disposed in the accommodating cavity and movable along the length direction of the external fixing member;

[0009] A nesting assembly is sleeved in the accommodating cavity, comprising an outer sleeve and an inner sleeve sleeved in the outer sleeve, wherein the outer sleeve is connected to the outer fixing member, the inner sleeve is connected to the inner fixing member, and the distal end of the outer sleeve is connected to the distal end of the inner sleeve, and a contractible structure is formed on one side of the circumferential surface of the inner sleeve, and the contractible structure contracts when subjected to pressure in the length direction to bend and deform the inner sleeve;

[0010] The drive shaft is rotatably connected to the mounting sleeve, and the drive shaft is threadedly matched with the outer fixing member and the inner fixing member respectively, and when the drive shaft rotates around the axis, the outer fixing member and the inner fixing member are driven to move in two opposite directions along the length direction of the mounting sleeve respectively.

[0011] The above vertebral channel shaping device has at least the following beneficial technical effects:

[0012] This embodiment can form a curved vertebral channel along the collapsed part of the spine according to the distribution of the collapsed part and the deformity of the spine, and then fill the curved vertebral channel with bone cement. Since the unilateral approach only makes an incision on one side, the bone cement leakage rate is low, the operation time is saved, the trauma is less, and the patient recovers quickly after surgery; since a curved vertebral channel can be formed, the collapsed part of the spine can be effectively reached, so the treatment effect of the bilateral approach can be achieved with a unilateral approach, and the vertebral height can be restored and the vertebral body can be stabilized with the help of the balloon and bone cement.

[0013] A curved vertebral channel can be formed by operating the driving shaft. When the driving shaft rotates around the axis, it drives the outer sleeve and the inner sleeve to move relative to each other in opposite directions along the length direction of the mounting sleeve, respectively. Deformation is generated through the interaction between the inner and outer sleeves, and the relative movement speed of the inner and outer sleeves is relatively fast, which comprehensively improves the bending deformation speed of the nested components, shortens the operation time, improves the surgical operation efficiency, and reduces the pain suffered by the patient.

[0014] In one embodiment, the external fixing member is provided with a driving cavity and a receiving cavity in sequence from the proximal end to the distal end, the first circumferential surface external thread of the driving shaft placed in the driving cavity cooperates with the inner wall thread of the driving cavity, the second circumferential surface external thread of the driving shaft placed in the receiving cavity cooperates with the inner thread of the internal fixing member, and the inner wall thread of the driving cavity and the inner thread of the internal fixing member have opposite rotation directions.

[0015] In one embodiment, the vertebral canaloplasty device further comprises a measurement structure, wherein the measurement structure comprises:

[0016] A positioning hole is formed on the surface of the mounting sleeve along the length direction of the mounting sleeve;

[0017] A positioning pin is connected to the external fixing member and passes through the positioning hole.

[0018] In one of the embodiments, a stop pin is provided on the mounting sleeve, and a limiting groove is provided around the circumferential surface of the drive shaft. The stop pin is embedded in the limiting groove to limit the movement of the drive shaft relative to the mounting sleeve along the length direction.

[0019] In one embodiment, the inner cross-section of the mounting sleeve and the outer cross-section of the external fixing member are both non-circular and have matching sizes, thereby limiting the relative rotation between the mounting sleeve and the external fixing member.

[0020] In one embodiment, the inner cross-section of the accommodating cavity and the outer cross-section of the inner fixing member are both non-circular shapes and have matching sizes, thereby limiting the relative rotation between the outer fixing member and the inner fixing member.

[0021] In one of the embodiments, one side of the circumferential surface of the inner sleeve is provided with a plurality of first grooves distributed along the length direction, or one side of the circumferential surface of the inner sleeve is missing and the distal end of the inner sleeve is pre-bent toward the missing side, thereby forming the retractable structure.

[0022] In one embodiment, the notch of the first groove is inclined toward the proximal end of the vertebral canaloplasty device.

[0023] In one of the embodiments, a stretchable structure is provided on the circumferential surface of the outer sleeve at a portion corresponding to the axial position of the contractible structure.

[0024] In one embodiment, the extendable structure comprises a second groove, the circumferential phase of the second groove on the outer sleeve is opposite to the circumferential phase of the contractible structure on the inner sleeve, or the extendable structure comprises a spiral groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a vertebral channel shaping device provided in one embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of a mounting sleeve in a vertebral canaloplasty device;

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional shape;

[0028] Figure 4 for Figure 1 A schematic diagram of an external fixator in a vertebral canaloplasty device;

[0029] Figure 5 for Figure 4 Left view of;

[0030] Figure 6 for Figure 1 A schematic diagram of an internal fixation member in a vertebral canaloplasty device;

[0031] Figure 7 for Figure 1Schematic diagram of a drive shaft in a vertebral canaloplasty device;

[0032] Figure 8 for Figure 1 Schematic diagram of nested components in a vertebroplasty device;

[0033] Fig. 9 for Figure 8 The curved state diagram of nested components;

[0034] Fig.10 A schematic diagram of a nested component provided for another embodiment of the present invention;

[0035] Fig.11 for Fig.10 Sectional view along the axis;

[0036] Fig.12 A schematic diagram of a nested component provided for yet another embodiment of the present invention;

[0037] Fig.13 for Fig.12 Sectional view along the axis;

[0038] In the figure, 100, installation sleeve; 110, stop pin;

[0039] 200, external fixing member; 210, driving cavity; 211, inner wall thread; 220, accommodating cavity; 230, positioning hole; 240, positioning cavity;

[0040] 300, internal fixing member; 310, internal thread;

[0041] 400, nested component; 410, outer component; 411, stretchable structure; 4111, second groove; 420, inner component; 421, retractable structure; 4211, first groove; 430, connector; 431, blind hole;

[0042] 500, driving shaft; 510, external thread on first circumferential surface; 520, external thread on second circumferential surface; 530, limiting groove; 540, handle;

[0043] 600, measuring structure; 610, positioning hole; 620, positioning pin;

[0044] 410', outer set; 411', spiral groove; 420', inner set; 421', retractable structure; 4211', first groove;

[0045] 410", outer set; 411", spiral groove; 420", inner set; 421", retractable structure. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] To facilitate understanding of the present invention, various embodiments defined by the claims of the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are given in the drawings, which contain various specific details to assist in this understanding, but these details should be regarded as exemplary only. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Accordingly, those of ordinary skill in the art will recognize that changes and improvements may be made to the various embodiments described herein without departing from the scope of the present invention defined by the appended claims. In addition, for the sake of clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0048] It will be apparent to those skilled in the art that the following description of various embodiments of the present invention is provided for illustrative purposes only and not for the purpose of limiting the invention as defined by the appended claims.

[0049] Throughout the specification and claims of this application document, the words "include" and "comprise" and variations of the words, such as "include" and "include" mean "including but not limited to", and are not intended to (and will not) exclude other components, integers or steps. Features, integers or characteristics described in conjunction with a particular aspect, embodiment or example of the present invention will be understood to be applicable to any other aspect, embodiment or example described herein, unless incompatible therewith.

[0050] It should be understood that the singular forms "a", "an", and "the" include plural references unless the context clearly dictates otherwise. The expressions "including" and / or "may include" used in the present invention are intended to indicate the presence of corresponding functions, operations, or elements, and are not intended to limit the presence of one or more functions, operations, and / or elements. In addition, in the present invention, the terms "including" and / or "having" are intended to indicate the presence of characteristics, quantities, operations, elements, and components, or combinations thereof, disclosed in the application documents. Therefore, the terms "including" and / or "having" should be understood as additional possibilities of one or more other characteristics, quantities, operations, elements, and components, or combinations thereof.

[0051] In the present invention, the expression "or" includes any or all combinations of the words listed together. For example, "A or B" may include A or B, or may include both A and B.

[0052] It should be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intervening element; when an element is considered to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or there can also be an intervening element.

[0053] The terms “upper”, “lower”, “left”, “right”, etc. mentioned in the text are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the context of the relevant field and this specification, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0055] In the following description, Figure 1 The right end (i.e., the end that extends into the patient's body) is the distal end, Figure 1 The left end (i.e., the end away from the patient and close to the operator) is taken as the proximal end. It is worth noting that the definition of the relevant orientation is only for the convenience of description and is not intended to limit the present invention.

[0056] like Figure 1 and Figure 8 As shown, in one embodiment of the present invention, a vertebral channel shaping device is provided, comprising:

[0057] Install the casing 100;

[0058] The external fixing member 200 is sleeved in the installation sleeve 100 and can move along the length direction of the installation sleeve 100. The external fixing member 200 is provided with a receiving cavity 220;

[0059] The inner fixing member 300 is disposed in the accommodating cavity 220 and can move along the length direction of the outer fixing member 200;

[0060] The nesting assembly 400 is sleeved in the accommodating cavity 220, and includes an outer sleeve 410 and an inner sleeve 420 sleeved in the outer sleeve 410, wherein the outer sleeve 410 is connected to the outer fixing member 200, and the inner sleeve 420 is connected to the inner fixing member 300, and the distal end of the outer sleeve 410 is connected to the distal end of the inner sleeve 420, and a contractible structure 421 is formed on one side of the circumferential surface of the inner sleeve 420, and the contractible structure 421 contracts when subjected to pressure in the length direction to bend and deform the inner sleeve 420;

[0061] The drive shaft 500 is rotatably connected to the mounting sleeve 100. The drive shaft 500 is threadedly matched with the external fixing member 200 and the internal fixing member 300 respectively, and can drive the external fixing member 200 and the internal fixing member 300 to move in two opposite directions along the length direction of the mounting sleeve 100 when the drive shaft 500 rotates around the axis. During specific operation, the installation sleeve 100 is held and the distal end of the nesting component 400 is inserted into the vertebral body through the incision. When the collapsed part needs to be bent, the driving shaft 500 is operated to rotate. Since the driving shaft 500 is threadedly matched with the external fixer 200 and the internal fixer 300 respectively and the driving shaft 500 rotates in situ, the driving shaft 500 can drive the external fixer 200 and the internal fixer 300 to move in opposite directions along the length direction of the installation sleeve 100 respectively. When the external fixer 200 moves toward the proximal end and the internal fixer 300 moves toward the distal end, the outer kit 410 connected to the external fixer 200 and the inner kit 420 connected to the internal fixer 300 move toward the proximal end and the distal end respectively, and the distal end of the outer kit 410 applies pressure along the length direction to the distal end of the inner kit 420, which causes the contractile structure 421 to contract and then causes the inner kit 420 to bend and deform, thereby forming a curved channel in the vertebral body along the collapsed part. After the curved channel is formed, the driving shaft 500 is operated in reverse to restore the nested component 400 to its original shape and the nested component 400 is withdrawn. Then, a balloon is inserted into the channel along the curved channel to expand the channel and fill it with bone cement to complete the vertebroplasty operation.

[0062] This embodiment can form a curved vertebral channel along the collapsed part of the spine according to the distribution of the collapsed part and the condition of the spinal deformity, and then fill the curved vertebral channel with bone cement. Although the unilateral approach only makes an incision on one side, since a curved vertebral channel can be formed to effectively reach the collapsed part, the unilateral approach surgery can achieve the effect of the bilateral approach, thereby more effectively strengthening and stabilizing the vertebral body, restoring the mechanical balance of the vertebral body, and relieving the patient's short-term and long-term pain.

[0063] Since only one side incision is required, the operation time is saved, the patient suffers less trauma, the postoperative recovery is quicker, and the bone cement leakage rate is lower.

[0064] A curved vertebral channel can be formed by operating the driving shaft 500. When the driving shaft 500 rotates around the axis, it drives the outer sleeve 410 and the inner sleeve 420 to move relative to each other in opposite directions along the length direction of the mounting sleeve 100, respectively. Deformation is generated through the interaction between the inner and outer sleeves, and the relative movement speed of the inner and outer sleeves is relatively fast, which comprehensively improves the bending deformation speed of the nested component 400, shortens the operation time, improves the surgical operation efficiency, and reduces the pain suffered by the patient.

[0065] In some embodiments, the inner cross-section of the mounting sleeve 100 and the outer cross-section of the external fixture 200 are both non-circular and have matching sizes, thereby limiting the relative rotation between the mounting sleeve 100 and the external fixture 200. Figure 3 and Figure 5 The non-circular shape may be an ellipse, a square, a hexagon, etc. Since these shapes are not perfect circles, it is possible to prevent the external fixing member 200 from rotating around the axis simultaneously with the driving shaft 500 and failing to move normally along the length direction of the installation sleeve 100 when the driving shaft 500 rotates, thereby ensuring normal operation. Of course, in other embodiments, the installation sleeve 100 and the external fixing member 200 may also be limited in relative rotation by other structures such as a slide rail.

[0066] In some embodiments, the inner cross-section of the accommodating cavity 220 and the outer cross-section of the inner fixing member 300 are both non-circular shapes and have matching sizes, thereby limiting the relative rotation between the outer fixing member 200 and the inner fixing member 300. Specifically, the non-circular shape can be an ellipse, a square, a hexagon, etc. Since these shapes are not perfect circles, they can limit the free rotation of the inner fixing member 300 in the outer fixing member 200, and can ensure that the inner fixing member 300 and the inner kit 420 can move normally along the length direction when the drive shaft 500 rotates, and ensure that the nested component 400 can bend normally. Of course, in other embodiments, the relative rotation between the accommodating cavity 220 and the inner fixing member 300 can also be limited by other structures such as slide rails.

[0067] refer to Figure 1 In some embodiments, the first circumferential surface external thread 510 of the drive shaft 500 disposed at the drive cavity 210 cooperates with the inner wall thread 211 of the drive cavity 210, and the second circumferential surface external thread 520 of the distal end of the drive shaft 500 cooperates with the inner thread 310 of the internal fixture 300, and the inner wall thread 211 of the drive cavity 210 and the inner thread 310 of the internal fixture 300 have opposite rotation directions. Specifically, since the inner wall thread 211 of the drive cavity 210 and the inner thread 310 of the internal fixture 300 have opposite rotation directions, when the drive shaft 500 rotates, the outer fixture 200 and the inner fixture 300 can be driven to move in opposite directions along the length direction of the installation sleeve 100, thereby realizing the outer set 410 and the inner set 420 to move toward the proximal end and the distal end, respectively. Furthermore, the inner wall thread 211 of the drive cavity 210 and the inner thread 310 of the internal fixing member 300 can be designed as threads with different pitches, so that the outer kit 410 and the inner kit 420 can move different distances when the drive shaft 500 rotates according to actual needs, thereby optimizing the surgical operation and providing flexible adjustment methods.

[0068] In other embodiments, the external fixing member 200 does not form the driving cavity 210, and the internal thread of the driving shaft 500 cooperates with the external thread of the external fixing member 200, and / or the internal thread of the driving shaft 500 cooperates with the external thread of the internal fixing member 300. That is, the driving shaft 500 only needs to be threadedly engaged with the external fixing member 200 and the internal fixing member 300, and there is no limitation on whether it is outside or inside.

[0069] refer to Figure 1 In some embodiments, the vertebral channel shaping device further comprises a measuring structure 600, wherein the measuring structure 600 comprises:

[0070] A positioning hole 610 is formed on the surface of the installation sleeve 100 along the length direction of the installation sleeve 100;

[0071] The positioning pin 620 is connected to the external fixing member 200 and passes through the positioning hole 610 .

[0072] Specifically, in the initial state, the positioning pin 620 is located at the far end of the positioning hole 610. When bending is required, the driving shaft 500 is operated to rotate so that the external fixing member 200 and the outer sleeve 410 move toward the proximal end, and the positioning pin 620 moves toward the proximal end along the positioning hole 610. The bending degree of the inner sleeve 420 can be determined according to the position of the positioning pin 620 in the positioning hole 610, and a scale can be set along the extending direction of the positioning hole 610.

[0073] In actual operation, an in vitro test may be performed in advance to understand the degree of bending of the inner sleeve 420 itself when the positioning pin 620 is at different positions in the positioning hole 610. In this embodiment, the degree of bending of the inner sleeve 420 can be determined by observing the position of the positioning pin 620 in the positioning hole 610, thereby facilitating the understanding and control of the bending deformation degree of the nesting component 400, which is more convenient to use.

[0074] Furthermore, it is preferred to limit the movement of the drive shaft 500 in the length direction. To prevent the drive shaft 500 from moving in the length direction when rotating, thereby causing the nesting assembly 400 to be unable to be normally driven to bend to a preset degree, refer to Figure 1 In some embodiments, a stop pin 110 is provided on the surface of the mounting sleeve 100, and a limiting groove 530 is provided around the circumferential surface of the drive shaft 500. The stop pin 110 passes through the mounting sleeve 100 and is embedded in the limiting groove 530, so as to limit the movement of the drive shaft 500 relative to the mounting sleeve 100 along the length direction. Specifically, the stop pin 110 is provided on the surface of the mounting sleeve 100, and when it is embedded in the limiting groove 530, it can limit the movement of the drive shaft 500 relative to the mounting sleeve 100 along the length direction, so that the nesting assembly 400 can be bent to a desired degree by rotating normally.

[0075] refer to Figure 8 In some embodiments, the distal end of the inner set 420 and the distal end of the outer set 410 are connected by a connector 430. Specifically, the connection by the connector 430 can facilitate the disassembly and assembly of each component, and when a component is damaged, it can be directly replaced without replacing the entire nesting assembly 400, saving costs. Furthermore, the connector 430 includes a blocking pin, which has a low cost and is easy to fix and install.

[0076] Of course, in some other embodiments, the distal end of the inner kit 420 and the distal end of the outer kit 410 can be directly connected together, which is not limited here.

[0077] refer to Figure 4 In some embodiments, the distal end of the external fixing member 200 extends distally to form a positioning cavity 240 that is connected to the accommodating cavity 220 and matches the size of the outer peripheral surface of the nested component 400. The positioning cavity 240 is used for the nested component 400 to pass through to position the nested component 400. Specifically, the nested component 400 can extend from the positioning cavity 240 at the distal end of the external fixing member 200 into the accommodating cavity 220. Since the positioning cavity 240 matches the size of the outer peripheral surface of the nested component 400, the nested component 400 will not shake radially in the accommodating cavity 220, which can ensure the stability of the position of the nested component 400; and the positioning cavity 240 extends distally, and the contact distance with the nested component 400 in the length direction is longer, which provides better support for the nested component 400. In particular, when the length of the nested component 400 is large, the longer support distance of the nested component 400 can prevent the nested component 400 from accidentally breaking under the action of the bending moment. The nested component 400 can also be fixed in the positioning cavity 240 by welding, bonding, snap-fitting, etc., and the fixing method is not limited.

[0078] refer to Figure 7 In some embodiments, a handle 540 is provided at the proximal end of the drive shaft 500. The handle 540 can facilitate the handheld operation of rotating the drive shaft 500, thereby making it easier to implement.

[0079] refer to Figure 8 In some embodiments, the outer sleeve 410 is an outer sleeve, the inner sleeve 420 is an inner sleeve, and a plurality of first grooves 4211 are provided on one side of the circumferential surface of the inner sleeve along the length direction, thereby forming the shrinkable structure 421. The "groove" here refers to the lack of part of the material on one side of the circumferential surface of the inner sleeve, and its form is not particularly limited. For example, when the inner sleeve 420 is a hollow tube, the "groove" can be hollowed out, that is, the lack of part of the tube wall. When the inner sleeve 420 is a solid rod, the "groove" can be a cut, etc.

[0080] Specifically, when the outer sleeve and the inner sleeve move toward the proximal end and the distal end respectively, the distal end of the outer sleeve applies pressure along the length direction to the distal end of the inner sleeve, and the pressure reduces the spacing between adjacent first grooves 4211, and then the inner sleeve deforms toward the side where the first groove 4211 is located, so that the outer sleeve and the inner sleeve are bent as a whole. The first groove 4211 is easy to form, which can effectively reduce costs.

[0081] Furthermore, the notch of the first groove 4211 is inclined toward the proximal end of the vertebral channel forming device. During the surgical approach, the edge of the notch contacts the human tissue part in the forward direction and will not be blocked by the human tissue, which is more conducive to the entry of the entire nested component 400. Furthermore, the inclination angle of the notch is 5-35°. According to experiments, the use of this angle can maximize the speed of entering the vertebral body. The inclination angle of the notch here refers to the angle between the inclination direction of the notch and the direction perpendicular to the axial direction.

[0082] In some embodiments, the circumferential surface of the outer sleeve at the corresponding axial position of the shrinkable structure 421 is provided with an elongated structure 411, and the elongated structure 411 includes a second groove 4111, and the circumferential phase of the second groove 4111 on the outer sleeve is opposite to the circumferential phase of the first groove 4211 on the inner sleeve. Here, "circumferential phase" refers to the position on the circumference, and "opposite circumferential phase" means that the positions on the circumference are opposite across the center of the circle.

[0083] When the outer sleeve and the inner sleeve move toward the proximal end and the distal end respectively, the distal end of the outer sleeve applies pressure along the length direction to the distal end of the inner sleeve to make the inner sleeve bend toward the side where the first groove 4211 is located; at the same time, under the interaction of forces, the distal end of the inner sleeve applies a thrust toward the distal end to the distal end of the outer sleeve, and the thrust increases the spacing between adjacent second grooves 4111, so that the outer sleeve bends to the other side opposite to the side where the second groove 4111 is located. Since the circumferential phase of the second groove 4111 on the outer sleeve 410 is opposite to the circumferential phase of the first groove 4211 on the inner sleeve 420, the outer sleeve bends to the side where the first groove 4211 is located. When the outer sleeve bends, it squeezes the inner sleeve at the same time to promote the inner sleeve to bend to the side where the first groove 4211 is located. Fig. 9 .

[0084] In this embodiment, the circumferential phase of the second groove 4111 of the outer sleeve on the outer sleeve is opposite to the circumferential phase of the first groove 4211 on the inner sleeve, which is beneficial to the bending deformation of the outer sleeve. After the outer sleeve is bent, it also promotes the deformation of the inner sleeve toward the side where the first groove 4211 is located, making the nested assembly 400 easier to bend as a whole and more convenient to operate.

[0085] refer to Fig.10 and Fig.11 In other embodiments, the outer set 410' is an outer sleeve, and the inner set 420' is an inner rod, and a plurality of first grooves 4211' are distributed along the length direction on one side of the circumferential surface of the inner rod, thereby forming a contractible structure 421'; and a spiral groove 411' is provided on the circumferential surface of the outer sleeve at a position corresponding to the axial position of the contractible structure 421'.

[0086] Specifically, when the outer sleeve and the inner sleeve rod move toward the proximal end and the distal end respectively, the distal end of the outer sleeve will apply pressure along the length direction to the distal end of the inner sleeve, and the pressure reduces the distance between adjacent first grooves 4211', so that the inner sleeve rod is deformed toward the side where the first grooves 4211' are located; at the same time, under the interaction of forces, the distal end of the inner sleeve applies a thrust toward the distal end to the distal end of the outer sleeve, and since the circumferential surface of the outer sleeve corresponding to the axial position of the contractible structure 421' is provided with a spiral groove 411', the size of the spiral groove 411' changes when subjected to force, and the outer sleeve and the inner sleeve rod are deformed in coordination, so that the outer sleeve and the inner sleeve are in a bent state as a whole.

[0087] In this embodiment, the maximum bending degree of the inner sleeve rod can be controlled by designing the width of the first groove 4211'; the design of the spiral groove 411' can ensure the bending freedom of the outer sleeve, and when the channel is established and the drive shaft is operated in the reverse direction to restore the nested component to a natural state and withdraw the nested component from the vertebral body, the spiral groove 411' has a spring-like function, which can promote the nested component to return to its initial state, facilitate the withdrawal of the nested component, avoid damage to surrounding tissues and jamming when withdrawing from the vertebral body, and can be used multiple times after returning to the initial state.

[0088] Furthermore, the outer sleeve is made of 06Cr19Ni10 stainless steel, and the inner sleeve is made of nickel-titanium alloy. 06Cr19Ni10 stainless steel can avoid corrosion and has strong resilience, which is conducive to the shape recovery of the outer sleeve; nickel-titanium alloy is light in weight and convenient for actual surgical operations.

[0089] refer to Fig.12 and Fig.13In some further embodiments, the outer sleeve 410" is an outer sleeve, the inner sleeve 420" is an inner sleeve rod, one side of the circumferential surface of the inner sleeve 420" is defaulted and the distal end of the inner sleeve 420" is pre-bent toward the default side, thereby forming the contractile structure 421"; and a spiral groove 411" is provided on the circumferential surface of the outer sleeve at a portion corresponding to the axial position of the contractile structure 421", or a groove is provided on the side opposite to the circumferential phase of the default side of the inner sleeve 420". Specifically, when the outer sleeve and the inner sleeve rod move toward the proximal end and the distal end respectively, the distal end of the outer sleeve will apply pressure along the length direction to the distal end of the inner sleeve rod. Since one side of the circumferential surface of the inner sleeve rod is defaulted and the distal end of the inner sleeve 420" is pre-bent toward the default side, the pressure of the outer sleeve on the distal end of the inner sleeve rod causes the inner sleeve rod to bend and deform toward the default side; at the same time, under the interaction of forces, the distal end of the inner sleeve rod applies a thrust toward the distal end to the distal end of the outer sleeve. Since one side of the inner sleeve rod is defaulted, the thrust of the inner sleeve rod on the distal end of the outer sleeve is offset to the other side opposite to the default side, that is, the thrust is not in a straight line with the axis of the outer sleeve. The offset thrust causes the outer sleeve to bend and deform toward the default side of the inner sleeve rod, and the deformation further applies pressure to the distal end of the inner sleeve rod to cause the inner sleeve rod to bend and deform toward the default side.

[0090] Preferably, a curved or inclined blind hole 431 is provided in the connector 430 such as a plug. When the inner sleeve 420" moves toward the distal end, it will be inserted into the blind hole 431. At this time, the curved or inclined blind hole 431 can guide the inner sleeve 420" to bend.

[0091] In this embodiment, the inner sleeve rod and the outer sleeve exert force on each other and bend and deform toward the default side at the same time. The inner sleeve rod with one side defaulted is conducive to the bending deformation of the outer sleeve, and the bending of the outer sleeve also has a significant promoting effect on the deformation of the inner sleeve toward the default side, making the nested assembly easier to bend as a whole and more convenient to operate; the inner sleeve rod has one side defaulted, so it has a greater degree of bending; the design of the spiral groove 411" can ensure the bending freedom of the outer sleeve, and when the channel is established and the drive shaft is reversed to restore the nested assembly to a natural state and the nested assembly is pulled out of the vertebral body, the spiral groove 411" has a spring-like function, which can promote the nested assembly to return to its initial state, which is conducive to the extraction of the nested assembly, avoiding damage to surrounding tissues and jamming when it is pulled out of the vertebral body, and it can be used multiple times after returning to the initial straight state.

[0092] In other embodiments, the shrinkable structure may also be a foldable structure (such as a structure similar to a folding bellows), a compressible structure (such as an elastic material or a material with voids inside), etc., as long as it can shrink under pressure in the length direction.

[0093] Likewise, the stretchable structure may also be a foldable structure, a compressible structure, etc., as long as it can be stretched under tension in the length direction.

[0094] Of course, in addition to the above embodiments, in other embodiments, the inner and outer sets described above can be combined and matched in any way, and are not limited here. And it can be understood that the circumferential surface of the outer set may not be provided with an elongated structure, and when the inner set is bent, the outer set can be deformed simultaneously with it.

[0095] In the above description, although expressions such as "first" and "second" may be used to describe various elements of the present invention, they are not intended to limit the corresponding elements. For example, the above expressions are not intended to limit the order or importance of the corresponding elements. The above expressions are used to distinguish one component from another component.

[0096] The terminology used in the specification of the present invention herein is only for the purpose of describing specific embodiments and is not intended to limit the present invention. A singular expression includes a plural expression unless there is a significant difference in context or scheme therebetween.

[0097] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

[0098] Those skilled in the art will understand that the various technical features of the above-described embodiments may be omitted, added or combined in any manner accordingly. To make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, and the simple transformation methods that can be thought of by those skilled in the art and the solutions for making adaptive and functional structural transformations to the prior art should be considered to be within the scope of this specification.

[0099] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that although the present invention has been shown and described with reference to various embodiments, for ordinary technicians in the field, various deformations and improvements in several forms and details can be made without departing from the concept of the present invention, and without departing from the scope of the present invention defined by the attached claims, all of which belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A vertebral canal shaping device, characterized in that: include: Install the casing; An external fixing member is sleeved in the installation sleeve and can move along the length direction of the installation sleeve, and the external fixing member is provided with a receiving cavity; An internal fixing member, disposed in the accommodating cavity and movable along the length direction of the external fixing member; A nesting assembly is sleeved in the accommodating cavity, comprising an outer sleeve and an inner sleeve sleeved in the outer sleeve, wherein the outer sleeve is connected to the outer fixing member, the inner sleeve is connected to the inner fixing member, and the distal end of the outer sleeve is connected to the distal end of the inner sleeve, and a contractible structure is formed on one side of the circumferential surface of the inner sleeve, and the contractible structure contracts when subjected to pressure in the length direction to bend and deform the inner sleeve; A drive shaft is rotatably connected to the mounting sleeve, the drive shaft is threadedly matched with the outer fixing member and the inner fixing member respectively, and when the drive shaft rotates around the axis, the outer fixing member and the inner fixing member are driven to move in two opposite directions along the length direction of the mounting sleeve respectively; The circumferential surface of the outer sleeve corresponding to the axial position of the contractible structure is provided with an elongatable structure; The external fixing member is provided with a driving cavity and a receiving cavity in sequence from the proximal end to the distal end. The external thread of the first circumferential surface of the driving shaft placed in the driving cavity matches with the inner wall thread of the driving cavity. The external thread of the second circumferential surface of the driving shaft placed in the receiving cavity matches with the inner thread of the internal fixing member, and the inner wall thread of the driving cavity and the inner thread of the internal fixing member have opposite rotation directions.

2. The vertebral body channel shaping device according to claim 1, characterized in that: The vertebral channel shaping device also includes a measurement structure, and the measurement structure includes: A positioning hole is formed on the surface of the mounting sleeve along the length direction of the mounting sleeve; A positioning pin is connected to the external fixing member and passes through the positioning hole.

3. The vertebral canal shaping device according to claim 1, characterized in that: The mounting sleeve is provided with a stop pin, and the drive shaft is provided with a limit groove around the circumferential surface. The stop pin is embedded in the limit groove to limit the movement of the drive shaft relative to the mounting sleeve along the length direction.

4. The vertebral body channel shaping device according to claim 1, characterized in that: The inner circumferential cross section of the installation sleeve and the outer circumferential cross section of the external fixing member are both non-circular shapes and have matching sizes, thereby limiting the relative rotation between the installation sleeve and the external fixing member.

5. The vertebral body channel shaping device according to claim 1, characterized in that: The inner circumferential cross section of the accommodating cavity and the outer circumferential cross section of the inner fixing member are both non-circular shapes and have matching sizes, thereby limiting the relative rotation between the outer fixing member and the inner fixing member.

6. The vertebral body channel shaping device according to claim 1, characterized in that: One side of the circumferential surface of the inner sleeve is provided with a plurality of first grooves distributed along the length direction, or one side of the circumferential surface of the inner sleeve is missing and the distal end of the inner sleeve is pre-bent toward the missing side, thereby forming the retractable structure.

7. The vertebral canaloplasty device according to claim 6, characterized in that: The notch of the first groove is inclined toward the proximal end of the vertebral channel shaping device.

8. The vertebral body channel shaping device according to claim 1, characterized in that: The extendable structure comprises a second groove, the second groove having a circumferential phase on the outer sleeve opposite to the circumferential phase of the contractible structure on the inner sleeve, or the extendable structure comprises a helical groove.

9. The vertebral body channel shaping device according to claim 1, characterized in that: The outer sleeve is an outer sleeve, and the inner sleeve is an inner sleeve rod.

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