WO2014005378A1

WO2014005378A1 - Minimally invasive and percutaneous internal fixation device

Info

Publication number: WO2014005378A1
Application number: PCT/CN2012/081888
Authority: WO
Inventors: 谭军; 陶凯; 山卫东
Original assignee: 常州市康辉医疗器械有限公司
Priority date: 2012-07-06
Filing date: 2012-09-25
Publication date: 2014-01-09
Also published as: CN103519876A; CN103519876B

Abstract

Disclosed is a minimally invasive and percutaneous internal fixation device comprising a minimally invasive holding sleeve (2) and a minimally invasive pedicle screw (1); the minimally invasive holding sleeve (2) consists of a minimally invasive casing (21), a locking sleeve (22), a chute pin (23), a tightening screw(24) and an anti-rotation pin (25); the minimally invasive pedicle screw (1) consists of a nail cap (11), a nail body (12) and a compression gasket (13). A horizontal projection (216) at the front end of the inner wall of the minimally invasive holding sleeve (2) and the anti-rotation pin (25) are matched together with a cross slot (115,116) on the outside of the nail cap of the minimally invasive pedicle screw (1) to restrict the multi-directional movement of the screw; the elongate design of the minimally invasive pedicle screw nail cap (11) makes it possible to achieve bar-molding automatically and bar-threading easily during surgery; during use, the screw is locked tightly by an outside projection (213) of the minimally invasive holding sleeve (2) , with an elastic design, and finally the tightening screw (24) is used to fix the whole device in a strengthening manner. The unique design of the inner wall of the minimally invasive holding sleeve (2) is matched with the cross slot (115,116) on the outside of the nail cap (11) of the pedicle screw, thus nail-holding and -removing is easy, fast and effective; the front end of the holding sleeve is of a two-thin-wall design, thus the trauma to a tissue channel is small; and the problems of difficult bar-threading, complex locking and loading of the screw cap etc. can be solved during surgery.

Description

Minimally invasive percutaneous access internal fixation device

[Technical Field]

The present invention relates to the field of surgical medical device technology, and more particularly to a minimally invasive percutaneous access internal fixation device. 【Background technique】

With the continuous updating of surgical instruments, the emergence of advanced medical imaging equipment, and the application of intraoperative computer-assisted navigation, minimally invasive techniques have developed rapidly in spinal surgery. Minimally invasive refers to a procedure or examination that achieves optimal surgical outcome with minimal invasiveness and minimal physical interference. The most important feature is minimal trauma. Surgery As a planned trauma, the surgeon should strive to minimize the trauma of the operation and achieve minimally invasive purposes. Minimally invasive surgery reduces the time of surgery, reduces the incidence of complications, reduces intraoperative tissue damage and hemorrhage, shortens patient recovery time, and reduces surgical pain. It is a beautiful incision, shortens hospitalization and rehabilitation time, and reduces the economic cost of drug use and hospitalization. . In short, minimally invasive surgery meets the requirements of a harmonious society for public health and health from the aspects of medical professional attributes and social attributes. With the development of science and technology, spine minimally invasive techniques will become a part of traditional surgical techniques and become a technique for spinal internal fixation. A major trend in development.

Through the research on the minimally invasive system design of several well-known brands in the world, it is found that the tool design of the existing international related products can meet the basic requirements of minimally invasive spine, but the problem lies in the complicated design concept and the cumbersome operation process. Surgeons with high skill experience can successfully complete the operation, which greatly hinders the promotion and popularization of spinal minimally invasive surgery. On the other hand, for spinal minimally invasive implants, there are two general types of existing pedicle screws. One type is a common standard nail and the other type is a long tail nail. Ordinary standard nails are operated by connecting sleeves, at which point the size of the sleeve determines the size of the tissue wound; the long tail of the long tail itself acts as a sleeve The function is easy to use, but the tail that is particularly lengthened at the back needs to be broken and discarded during the operation, and the waste in the process is a waste of the material itself. Although it can meet the basic requirements of minimally invasive spinal cord when used with surgical tools, the problem is that the operation process is cumbersome, and there are problems such as difficulty in wearing the rod and complicated locking pressure of the nut. Therefore, it is very important to provide a minimally invasive spinal system with independent intellectual property rights to minimize minimally invasive surgery, simple operation and convenient and reliable tools.

[Summary of the Invention]

The object of the present invention is to provide a minimally invasive percutaneous access internal fixation device which is simple in operation, small in damage to the skin, and at the same time, can solve the problems of difficulty in wearing the rod and complicated locking pressure of the nut.

The object of the present invention is achieved by the following technical solutions:

A minimally invasive percutaneous access internal fixation device comprising a minimally invasive grasping sleeve and a minimally invasive pedicle screw, a minimally invasive grasping sleeve for use with a minimally invasive pedicle screw; a minimally invasive grasping of a horizontal projection of the inner wall of the front end of the sleeve The horizontal groove on the outer side of the nail cap of the minimally invasive pedicle screw is used to limit the axial movement of the minimally invasive pedicle screw; the anti-rotation pin of the inner wall of the minimally invasive sleeve is matched with the vertical long groove on the outer side of the nut, limiting micro The rotational movement of the pedicle screw around the axial direction; the lock purple sleeve of the minimally invasive holding sleeve is moved forward to lock the connection between the purple and the minimally invasive pedicle screw, and finally the lock purple by the minimally invasive holding sleeve The screw is used to strengthen and fix the minimally invasive holding sleeve, which is composed of a minimally invasive sleeve, a lock purple sleeve, a chute pin, a lock purple screw and an anti-rotation pin. The lock purple sleeve is sleeved outside the minimally invasive sleeve; the chute pin connects the lock purple sleeve with the minimally invasive sleeve, so that the lock purple sleeve can move in a limited range with the minimally invasive sleeve in the axial direction; The lock purple sleeve is fixed with the minimally invasive cannula; the anti-rotation pin is located at the front end of the minimally invasive cannula to limit the axial rotation of the pedicle screw connected to the minimally invasive cannula.

The minimally invasive sleeve is hollow; the front end is provided with a U-shaped long groove, and the U-shaped groove divides the front end of the sleeve into two sides; the outer side of the two side walls is provided with a gradual protrusion, and the purple purple sleeve is used to realize the elastic lock purple; The front end portion of the side wall is thinner, which can better reduce the trauma to the tissue; the two side walls are respectively provided with one or more rows of small holes for connecting with the anti-rotation pin to limit the axial rotation movement of the screw; It has a horizontal protrusion that fits the outer groove of the pedicle screw cap. To limit the axial movement of the screw; the oscillating sleeve is provided with two symmetrical long grooves to match the chute pin to move the lock purple sleeve up and down in the axial direction; the minimally invasive sleeve is provided with a slot III to match Used by other surgical tools.

The lock purple sleeve is hollow design, the front end is provided with a U-shaped groove III, and the U-shaped groove III divides the lock purple sleeve into two sides; the two side walls are respectively provided with a threaded hole I, which cooperates with the chute pin; Each side of the side is provided with a recess for holding; a front end and a rear end of the recess are respectively provided with a protrusion for convenient use, which is convenient for holding; a threaded hole II is arranged at the rear end of the lock purple, and is matched with the lock purple screw for fixing the lock Purple sleeve and minimally invasive cannula.

The chute pin has an external thread I at one end and a slot in the head; the other end is a cylinder III, and the front end is blunt.

The lock purple screw is provided with an external thread II, and one end is provided with a hexagon socket or a plum hole.

The anti-rotation pin is cylindrical IV and has a spherical shape at one end.

A minimally invasive holding sleeve, the assembly process is: inserting the anti-rotation pin into the small hole at the front end of the minimally invasive cannula, and welding with the minimally invasive cannula and grinding the surface; the lock purple sleeve is placed outside the minimally invasive cannula; The chute pin is screwed into the threaded hole on both sides of the lock purple sleeve, and the front end is inserted into the long groove of the minimally invasive sleeve, so that the lock purple sleeve is connected with the minimally invasive sleeve, and the lock purple sleeve can be axially oriented with the minimally invasive sleeve. Move on a limited range; screw the lock purple screw on the lock purple sleeve.

A minimally invasive grasping sleeve is used in conjunction with a minimally invasive pedicle screw.

The minimally invasive pedicle screw consists of a nail cap, a nail body, and a pressed purple pad. The nail body passes through the nail cap and is fixed by a pressure purple pad.

The nail cap and the tail end of the nail cap are provided with an elongated portion than the standard nail, and the self-pressing rod can be realized during the operation, and the wearing rod is simple; the U-shaped groove I is provided at one end, and the inner wall of the U-shaped groove I is provided with an internal thread I. The inner wall body is a cylinder I, and the upper side walls are provided with a groove I and a groove perpendicular to the axial direction of the nail cap; the other end is provided with a spherical cup I and a through hole I; Or a plurality of horizontal grooves for use with the surgical tool to limit the axial up and down movement of the screw; the outer side of the nail cap is provided with one or more vertical long grooves in the middle of the two sides along the axial direction thereof, for use with the surgical tool To limit the rotational movement of the screw about the axial direction; the horizontal groove and the longitudinal length of the crisscross outer side of the nut cap The groove design is matched with the surgical tool, the nailing operation is simple and convenient, the tissue passage is small, and the wound mold section is small. The head of the nail body is provided with a spherical body and a hexagonal hole i, and the end of the spherical body is provided with a plurality of steps, the spherical body of the head of the nail body and the spherical cup I and the pressure pad on the nail cap The upper spherical cup II is matched; the body of the nail body is provided with a reducing thread, the diameter of the proximal end of the head is larger, the diameter of the distal end of the head is smaller, and the tip is gradually smaller, which increases the holding force of the screw. The thread of the body of the nail is a multi-threaded thread, which can increase the holding force of the screw and the nail is fast; the nail body is hollow.

The pressure purple pad is provided with a through hole III, and one end is provided with a groove type II, and the two edge protrusions are stuck at the groove I of the inner wall of the nail cap for limiting, and the lower end of the pressed purple pad is provided with a spherical cup. II. The outer body of the pressed purple pad is a cylinder II, which matches the cylinder I of the inner wall of the nail cap.

The pedicle screw assembly process is as follows: First, the nail body is passed through the through hole I of the nail cap, and the ball head body is matched with the spherical cup I of the nail cap; then the pressed purple pad is stuck, the padded The spherical cup II cooperates with the spherical body of the nail body, and the two edge protrusions are caught at the groove I of the nail cap; after assembly, the nail body and the pressed purple pad are not able to escape from the nail cap.

The pedicle screw cap extension allows the pedicle screw to be inserted into the plunger after the intraoperative rod is implanted. The locking screw can be directly screwed into the pressure bar for easy operation. The part was broken later in the operation.

The invention can be used for minimally invasive surgery, and can also be used for open surgery and spinal orthopedic surgery.

In use, the minimally invasive holding sleeve is inserted into the outer side of the nut from above, and the horizontal protrusion of the inner wall of the front end of the sleeve cooperates with the outer groove of the pedicle screw cap to limit the axial movement of the screw; the anti-rotation pin of the inner wall of the device is matched with the nut The vertical long slot on the outside limits the rotational movement of the screw about the axis. At the same time, by utilizing the elasticity of the front end structure of the minimally invasive cannula, the connection between the lock purple and the pedicle screw is moved forward by the lock purple sleeve, and finally the fixation can be strengthened by the lock purple screw. When the microspin is removed, the sleeve is slightly invasive and can be pulled out from the pedicle screw.

Compared with the prior art, the positive effects of the present invention are:

(1) The unique minimally invasive sleeve inner wall anti-rotation pin and horizontal convex design cooperate with the outer cross groove of the pedicle screw nut to limit its movement in multiple directions. It is easy to use during operation, nailing and removal. The operation is fast and efficient. (2) The invention adopts the convexity and elastic design of the outer side of the minimally invasive sleeve, and cooperates with the lock purple sleeve to lock the purple, which is convenient and effective.

(3) The present invention is connected to the pedicle screw through the two thin walls at the front end, and the tissue passage is small in trauma, and in particular, the wound mold section is greatly reduced compared with the prior art.

(4) The unique vertical cross groove design on the side of the pedicle screw cap of the present invention has simple nail holding operation;

(5) The pedicle screw cap of the present invention is extended with a surgical tool using a locking screw to achieve self-pressurization of the rod, and the wearing rod is simple;

(6) The utility model has the advantages that the utility model can increase the holding force of the screw and the speed of the nail insertion;

(7) The pedicle screw body of the present invention has a hollow design and can be used for minimally invasive surgery, and can also be used for open surgery and spinal orthopedic surgery.

[Description of the Drawings]

Figure 1 is a three-dimensional schematic view of a spinal minimally invasive percutaneous access internal fixation device;

Figure 2 is a three-dimensional schematic view of the assembly of the present invention - a minimally invasive grip sleeve;

Figure 3 shows the assembly of the present invention - a minimally invasive gripping sleeve exploded view;

Figure 4A is a front elevational view of the minimally invasive cannula of the present invention;

Figure 4B is a top cross-sectional view of the minimally invasive sleeve of the assembly of the present invention;

Figure 4C is a three-dimensional schematic view of the minimally invasive cannula of the present invention

Figure 5A is a front elevational cross-sectional view of the assembly lock purple sleeve of the present invention;

Figure 5B is a left side view of the component lock purple sleeve of the present invention;

Figure 5C is a top view of the component lock purple sleeve of the present invention;

Figure 5D is a three-dimensional schematic view of the component lock purple sleeve of the present invention; Figure 6A is a front elevational view of the component chute pin of the present invention;

Figure 6B is a top view of the component chute pin of the present invention;

Figure 7A is a front view of the assembly lock purple screw of the present invention;

Figure 7B is a top view of the component lock purple screw of the present invention;

Figure 8A is a front view of the assembly anti-spinning pin of the present invention;

Figure 8B is a top view of the assembly anti-rotation pin of the present invention;

Figure 8C is a three-dimensional view of the assembly of the present invention;

Figure 9 is a three-dimensional schematic view of a minimally invasive hollow pedicle screw of the assembly of the present invention;

Figure 10A is a front view of the minimally invasive hollow pedicle screw of the assembly of the present invention;

Figure 10B is a left side view of the minimally invasive hollow pedicle screw of the assembly of the present invention;

Figure 11A is a cross-sectional view showing the assembly of the present invention;

Figure 11B is an assembled left side view of the present invention.

The reference numerals in the drawings are: 1, hollow pedicle screw, 11, nut, 111, U-shaped groove 1, 112, internal thread, 113, spherical cup I, 114, through hole I, 115, horizontal groove , 116, Longitudinal slot, 117, cylinder I, 118, slot I, 119, slot II, 1110, extension, 12, nail, 121, spherical body, 122, step, 123, hexagon socket I, 124 , Reducing multi-start thread, 125, through hole II, 13, pressing purple pad, 131, cylinder II, 132, U-groove II, 133, through hole III, 134, spherical cup II, 135, projection I, 2, minimally invasive holding sleeve, 21, minimally invasive casing, 211, U-shaped long groove, 212, through hole IV, 213, graded protrusion, 214, front end low-cut thin wall, 215, inner wall cylinder, 216, Horizontal projection, 217, small hole, 218, long groove, 219, groove III, 22 lock purple sleeve, 221, through hole V, 222, U-shaped groove III, 223, threaded hole I, 224, groove, 225, Raised II, 226, raised III, 227 threaded hole II, 23, chute pin, 231, cylindrical III, 232 male thread I, 233, slotted, 24, lock purple screw, 241, external thread II, 242 , Hexagonal hole II, 25 anti-rotation pin, 251, cylindrical IV, 252, hemisphere. 【detailed description】

DETAILED DESCRIPTION OF THE INVENTION A specific embodiment of a spinal percutaneous access internal fixation device of the present invention is provided below. Example 1

1 is a three-dimensional schematic view of a spinal percutaneous internal fixation device of the present invention; FIG. 2, FIG. 3, FIG. 4A, FIG. 4B, FIG. 4C, FIG. 5A, FIG. 5B, FIG. 5C, FIG. 5D, FIG. 6B, FIG. 7A, FIG. 7B, FIG. 8A, FIG. 8B, FIG. 8C is a schematic view of the minimally invasive holding sleeve of the assembly of the present invention, FIG. 9 and FIG. 10A, FIG. 10B is a schematic view of the minimally invasive pedicle screw of the present invention, FIG. 11A, Figure 11B is a two dimensional schematic view of the assembly of the present invention.

A minimally invasive percutaneous access internal fixation device comprising a minimally invasive grasping sleeve 2 and a minimally invasive pedicle screw 1 .

A minimally invasive grip sleeve 2 consisting of a minimally invasive sleeve 21, a lock violet sleeve 22, a chute pin 23, a lock violet screw 24 and an anti-rotation pin 25. The lock purple sleeve 22 is sleeved outside the minimally invasive sleeve 21; the chute pin 23 connects the lock purple sleeve 22 with the minimally invasive sleeve 21, so that the lock purple sleeve 22 can be in a limited range with the minimally invasive sleeve 21 in the axial direction. Movement; the lock purple sleeve 22 can be fixed to the minimally invasive cannula 21 by the lock purple screw 24; the anti-rotation pin 25 is connected to the front end of the minimally invasive cannula 21 for limiting the pedicle screw 1 connected to the minimally invasive cannula 21 Axial rotation.

The minimally invasive sleeve 21 is a hollow design 212; the front end is provided with a U-shaped long groove 211, and the U-shaped groove 211 divides the front end of the sleeve into two sides; the outer side of the two side walls is provided with a gradation protrusion 213, which is matched with the lock purple sleeve. The elastic locking purple is realized; the thin wall 214 at the front end portion of the side wall can better reduce the trauma to the tissue; the inner side of the front end of the two side walls is a columnar shape 215, which matches the outer side of the pedicle screw nail cap; The protrusion 216 is matched with the outer groove of the pedicle screw cap to limit the axial movement of the screw; the front ends of the two side walls are respectively provided with one or more rows of small holes 217 for connecting with the anti-rotation pin; 21 is provided with two symmetrical long grooves 218 to cooperate with the chute pin 23 to move the lock purple sleeve 22 up and down in the axial direction; the minimally invasive sleeve 21 is provided with a groove 111219 for use with other surgical tools.

The lock purple sleeve 22 is a hollow design 221, and the front end is provided with a U-shaped groove 222, and the U-shaped groove 222 is locked with a purple sleeve. 22 is divided into two sides; the two side walls are respectively provided with a threaded hole 1223, which cooperates with the chute pin 23; the outer side of the lock purple sleeve 22 is provided with a concave portion 224 for holding; the front end and the rear end of the concave portion 224 are respectively provided with a protrusion 225 226, for convenient use, is favorable for holding; the rear end of the lock purple device is provided with a threaded hole 11227, which cooperates with the lock purple screw 24 to fix the lock purple sleeve 22 and the minimally invasive sleeve 21.

The chute pin 23 has an external thread 1232 at one end, and the head is provided with a slot 233; the other end is a cylinder 111231, and the front end is round and blunt.

The lock purple screw 24 has an external thread 11241 and a hexagon socket 11242 at one end.

The anti-rotation pin 25 has a cylindrical shape 251 and a spherical shape 252 at one end.

A minimally invasive holding sleeve 2 is assembled by inserting an anti-rotation pin 25 into the small hole 217 at the front end of the minimally invasive cannula 21, and welding it with the minimally invasive cannula 21 and grinding the surface; Outside the minimally invasive sleeve 21; screw the chute pin 23 into the threaded hole 223 on both sides of the lock purple sleeve 22, and insert the front end into the long groove 218 of the minimally invasive sleeve, thereby connecting the lock purple sleeve 22 with the minimally invasive sleeve 21 And the lock purple sleeve can move with the minimally invasive sleeve 21 in a limited range in the axial direction; the lock purple screw 24 is screwed into the lock purple sleeve 22.

A minimally invasive grasping sleeve 2 is used in combination with a minimally invasive pedicle screw 1 . A minimally invasive pedicle screw is composed of a nail cap 11 , a nail body 12 , and a pressing pad 13 , and the nail body 12 passes through the nail cap 11 . , and fixed by the pressure purple pad 圏 13 limit.

The nail cap 11 and the tail end of the nail cap are provided with an elongated portion 1110 compared with the standard nail, and the self-pressing rod can be realized during the operation, and the rod is simple to be worn; the U-shaped groove 1111 is provided at one end, and the inner wall of the open end of the U-shaped groove 1111 is provided therein. Thread 1112; the inner wall body is a cylinder 1117, the upper side walls of the upper side are provided with a groove 1118 and a groove II119 perpendicular to the axial direction of the nail cap; the other end is provided with a spherical cup 1113 and a through hole 1114; There is a horizontal groove 115 for use with the surgical tool to limit the axial up and down movement of the screw; the outer side of the nail cap is provided with a vertical long groove 116 in the middle of the axial direction of the nail cap, which is used in conjunction with the surgical tool to limit the screw winding. Axial rotary motion; the wedge-shaped groove 115 and the longitudinal long groove 116 on the outer side of the nail cap are designed to match the surgical tool, and the nailing operation is simple and convenient, and the tissue is organized. The channel has little trauma, especially the small cross section of the wound.

The head of the nail body 12 is provided with a spherical body 3 body 121 and a hexagonal hole 1123, and the spherical body is provided with a plurality of steps 122, a spherical body 121 of the nail body head and a spherical cup on the nail cap. I 113 is matched with the spherical cup II 134 on the pressed purple pad; the body of the nail is provided with the reducing thread 124, the diameter of the proximal end of the head is larger, the diameter of the distal end of the head is smaller, and the tip is gradually Smaller; the body of the nail is a multi-start thread 124; the multi-start thread and the reduced-diameter thread design of the nail body can increase the holding force of the screw and the nail is fast; the nail body has a hollow design 125.

The pressing pad 13 is provided with a through hole 11133, and a U-shaped groove 11132 is opened at one end, and the two edge protrusions 1135 are stuck at the groove 1118 of the inner wall of the nail cap for limiting, and the lower end of the pressing purple pad is provided with a spherical shape. The cup II 134, the outer body of the pressed purple pad is a cylinder 11131, which is matched with the inner wall main body 1117 of the nail cap.

The assembly process of the minimally invasive pedicle screw 1 is as follows: First, the nail body 12 is passed through the through hole 1114 of the nail cap 11, and the ball head body 121 is matched with the spherical cup I 113 of the nail cap; The 圏13 is snapped in, and the spheroidal cup II 134 of the pad fits with the spherical body 121 of the nail body, and the two edge protrusions 135 are caught at the groove 1118 of the nail cap. After assembly, the nail body 12 and the pressed purple pad 13 cannot be released from the nail cap 11.

In use, the minimally invasive grip sleeve 2 is inserted from the upper end of the nail cap 11, and the horizontal protrusion 216 of the inner wall of the front end of the minimally invasive sleeve is matched with the outer groove 115 of the pedicle screw cap to limit the axial movement of the screw; The anti-rotation pin 25 of the inner wall of the sleeve cooperates with a vertical long groove 116 on the outer side of the nut to limit the rotational movement of the screw about the axial direction. At the same time, by utilizing the elasticity of the front end structure of the minimally invasive cannula 21, the connection between the lock purple and the pedicle screw 1 is moved forward by the lock purple sleeve 22, and finally the fixation can be strengthened by the lock purple screw 24. When the micro-rotation device is removed, it can be pulled out from the pedicle screw.

Claims

1. A minimally invasive percutaneous access internal fixation device comprising a minimally invasive grasping sleeve and a minimally invasive pedicle screw, a minimally invasive grasping sleeve for use with a minimally invasive pedicle screw; characterized in that a minimally invasive gripping sleeve The horizontal protrusion of the inner wall of the front end cooperates with the horizontal groove on the outer side of the nail of the minimally invasive pedicle screw to limit the axial movement of the minimally invasive pedicle screw; the anti-rotation pin of the inner wall of the minimally invasive sleeve is matched with the outer side of the nut Straight long trough, limiting the rotational movement of the minimally invasive pedicle screw in the axial direction; through the minimally invasive holding of the sleeve of the lock purple sleeve to move the lock between the purple and its minimally invasive pedicle screw, and finally through the micro The locking purple screw of the holding sleeve is strengthened and fixed.

2. The minimally invasive percutaneous access internal fixation device according to claim 1, wherein the minimally invasive holding sleeve comprises a minimally invasive sleeve, a lock purple sleeve, a chute pin, and a lock purple screw. And the anti-rotation pin is composed; the lock purple sleeve is sleeved outside the minimally invasive sleeve; the chute pin connects the lock purple sleeve with the minimally invasive sleeve; the lock purple sleeve can be fixed with the minimally invasive sleeve by the lock purple screw book; Located at the front of the minimally invasive cannula to limit the axial rotation of the pedicle screw attached to the minimally invasive cannula.

3. The minimally invasive percutaneous access internal fixation device according to claim 2, wherein the minimally invasive sleeve is hollow; the front end is provided with a U-shaped long groove, and the U-shaped groove is a sleeve The front end is divided into two sides; a gradual protrusion is arranged on the outer side of the two side walls, and the purple lock is used to realize the elastic lock purple; the front end portion of the side wall is thin; the two side walls are respectively provided with one or more rows of small holes, and the anti-spinning pin Connecting, limiting the axial rotation of the screw; the inner side of the two side walls is provided with a horizontal protrusion, which cooperates with the outer groove of the pedicle screw cap to limit the axial movement of the screw; the symmetrical sleeve is provided with two symmetrical The long groove is matched with the chute pin to move the lock purple sleeve up and down in the axial direction; the minimally invasive sleeve is provided with the groove III.

4. The minimally invasive percutaneous access internal fixation device according to claim 2, wherein the lock purple sleeve is hollow, and the front end is provided with a U-shaped groove III, and the U-shaped groove III will lock the purple The sleeve is divided into two sides; the two side walls are respectively provided with a threaded hole I to cooperate with the chute pin; the outer side of the lock purple sleeve is provided with a concave portion; the front end and the rear end of the concave portion are respectively provided with a protrusion; the rear end of the lock purple device is provided with a thread Hole II, matched with the lock purple screw, to fix the lock purple sleeve and the minimally invasive sleeve.

5. A minimally invasive percutaneous access internal fixation device according to claim 2, wherein said chute Pin, one end is provided with external thread I, and the head is provided with a slot; the other end is cylinder III, the front end is round and blunt; the lock purple screw is provided with external thread II, and one end is provided with a hexagonal hole or a plum blossom hole;

The anti-rotation pin is cylindrical IV and has a spherical shape at one end.

6. A minimally invasive holding sleeve, characterized in that the assembly process is: inserting the anti-rotation pin into the small hole at the front end of the minimally invasive cannula, and welding with the minimally invasive cannula and grinding the surface; Outside the casing; screw the chute pin into the threaded hole I on both sides of the lock purple sleeve, insert the front end into the long groove of the minimally invasive casing, and connect the lock purple sleeve to the minimally invasive casing; screw in the lock purple sleeve Lock the purple screw.

7. The minimally invasive percutaneous internal fixation device according to claim 1, wherein the minimally invasive pedicle screw is composed of a nail cap, a nail body, and a pressed purple pad, and the nail body passes through. Nail caps, and fixed by the pressure purple pad 圏 limit.

8. The minimally invasive percutaneous access internal fixation device according to claim 7, wherein the nail cap and the nail cap are provided with an elongated portion than the standard nail; and one end is provided with a U-shaped groove I, U. The inner wall of one end of the opening of the groove I is provided with an internal thread; the main body of the inner wall is a cylinder I, the upper side of the side wall is provided with a groove I and a groove perpendicular to the axial direction of the nail cap; the other end is provided with a spherical cup I and a through hole I; One or more horizontal grooves are respectively disposed at the outer middle portions of the two ends of the nail cap; the outer side of the nail cap is provided with one or more vertical long grooves in the middle of the two sides in the axial direction thereof.

9. The minimally invasive percutaneous access internal fixation device according to claim 7, wherein the nail body is provided with a spherical body and a hexagonal hole ι, and the spherical body is provided with a plurality of ends. Step, the spherical body of the head of the nail body is matched with the spherical cup I on the nail cap and the spherical cup II on the pressed purple pad; the body of the nail body is provided with a reducing thread, and the diameter of the proximal end of the head is relatively smaller. Large, the distal end of the head has a smaller diameter and the tip is gradually smaller; the body of the nail has a multi-thread; the body is hollow;

The pressure purple pad is provided with a through hole III, and one end is provided with a groove type II, and the two edge protrusions are stuck at the groove I of the inner wall of the nail cap for limiting, and the lower end of the pressure purple pad is provided with a spherical cup II. The outer body of the pressed purple pad is a cylinder II, which is matched with the main body cylinder I of the inner wall of the nail cap.

10. A minimally invasive pedicle screw, characterized in that the assembly process is: first, the nail body is passed through the through hole of the nail cap, and the ball head body is matched with the spherical cup I of the nail cap; The pressed purple pad is stuck, the spherical cup II of the pad is matched with the spherical body of the nail body, and the two edge protrusions are stuck at the slot I of the nail cap; after assembling, the nail body and the pressed purple pad cannot be attached from the nail cap Come out.