CN210931752U

CN210931752U - Pedicle of vertebral arch minimal access surgery apparatus

Info

Publication number: CN210931752U
Application number: CN201921391886.1U
Authority: CN
Inventors: 牛国旗; 周乾坤; 杨德富; 周功; 陈扬; 聂丰; 聂虎; 刘涛; 丁祥; 蒋维利
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-07-07
Anticipated expiration: 2029-08-26

Abstract

The utility model provides a pedicle of vertebral arch wicresoft surgical instruments, its characterized in that: it comprises a pedicle screw and an embedding guide device correspondingly matched with the pedicle screw. The utility model discloses simple structure, convenient to use, can be fast accurate set up the passageway of putting into for solid pedicle of vertebral arch screw has overcome the defect that can only adopt hollow pedicle of vertebral arch screw in the current minimal access surgery in can applying the minimal access surgery.

Description

Pedicle of vertebral arch minimal access surgery apparatus

The technical field is as follows:

the utility model belongs to the technical field of surgical instruments and specifically relates to a pedicle of vertebral arch minimal access surgery instrument.

Background art:

with the development of society, the operation amount of thoracolumbar internal fixation in spinal surgery tends to increase year by year, and the demand of spinal pedicle screw fixation is increased, so that the spinal pedicle screw fixation is widely used for treating spinal degenerative diseases, spinal deformity, fracture, tumors, infection and the like. In order to pursue the precision and the minimally invasive of the spine surgery, the percutaneous minimally invasive pedicle screws are gradually applied to the clinic. The existing percutaneous minimally invasive pedicle screw is different from a screw in the traditional open operation, and is generally a hollow screw, while the screw in the hollow design can greatly reduce the bending or fatigue strength of the screw, so that the screw has the defects of insufficient fixing strength, limited orthopedic force and the like, the capability of recovering the height of a damaged vertebra, correcting the kyphosis and the like in the operation is inferior to that of a solid screw in the open operation, and the use of the screw is limited particularly when the pedicle of the upper thoracic vertebra is thin.

Therefore, the design of a solid pedicle screw and an implanting device thereof in percutaneous minimally invasive surgery is an urgent need.

The utility model has the following contents:

the utility model provides a minimally invasive solid pedicle screw and a minimally invasive surgical instrument composed of an embedded guiding device, aiming at overcoming the defects in the prior percutaneous minimally invasive hollow screw technology.

The application provides the following technical scheme:

a pedicle of vertebral arch minimal access surgery apparatus which characterized in that: the pedicle screw embedding guide device comprises a pedicle screw and an embedding guide device correspondingly matched with the pedicle screw, wherein the embedding guide device comprises a guide pillar, a central through hole is formed in the guide pillar, a first sleeve is sleeved on the guide pillar, a second sleeve is sleeved on the first sleeve, a third sleeve is sleeved on the second sleeve, a fourth sleeve is sleeved on the third sleeve, a pair of wing pieces are arranged at the upper end part of the fourth sleeve, and a group of sharp teeth are arranged at the lower end part of the fourth sleeve; the pedicle screw comprises a solid screw rod, a U-shaped screw seat is connected to the upper end of the screw rod, a cambered surface which corresponds to the inner wall of the fourth sleeve and is matched with the outer wall of the U-shaped screw seat is arranged on the outer wall of the U-shaped screw seat, tail wings are integrally connected to the top ends of the two walls of the U-shaped screw seat, and grooves are formed in the joints of the tail wings and the top ends of the two walls of the U-shaped screw seat.

On the basis of the technical scheme, the following further technical scheme can be provided:

the lower end of the guide post is provided with a conical narrowing part, the lower end of the first sleeve is provided with a first narrowing part, the lower end of the second sleeve is provided with a second narrowing part, the lower end of the third sleeve is provided with a third narrowing part, and the lower end of the fourth sleeve is provided with a fourth narrowing part.

And a reinforcing rib is arranged between the wing and the fourth sleeve.

The U-shaped nail seat bottom be equipped with the through-hole, be equipped with the cambered surface on the through-hole inner wall, the cover is equipped with the screw rod in the through-hole the screw rod top is equipped with and corresponds the complex bulb with the cambered surface, is equipped with the locking groove on the bulb, is equipped with corresponding complex in the U-shaped nail seat on the bulb and compresses tightly the piece, is equipped with on compressing tightly the piece outer wall and corresponds complex screw thread with U-shaped nail seat inner wall, is equipped with the hole of stepping down that corresponds with the locking groove on compressing tightly the piece.

The bottom of the U-shaped nail seat is provided with an integrally manufactured screw rod, the U-shaped nail seat is internally threaded with a gland, and the gland is provided with a locking hole.

Utility model advantage:

the utility model discloses simple structure, convenient to use, can be fast accurate for putting into solid pedicle of vertebral arch screw and provide operation passageway for solid pedicle of vertebral arch screw can be arranged in percutaneous wicresoft's operation, and then improves the intensity of percutaneous wicresoft screw by a wide margin, reduces the complication of operation, reduces patient's operation wound and the disconnected nail phenomenon of screw nail body, has important clinical meaning.

Description of the drawings:

FIG. 1 is a perspective view of a guiding device for insertion of the present invention;

FIG. 2 is a schematic structural view of the insertion guide device of the present invention;

FIG. 3 is a schematic view of the screw insertion of embodiment 1;

FIG. 4 is a schematic view of the screw insertion of embodiment 2;

FIG. 5 is an enlarged view of the line A in FIG. 4;

FIG. 6 is a schematic view of a pedicle screw in example 1;

FIG. 7 is a schematic view of a pedicle screw in example 2;

FIG. 8 is a schematic view of a pedicle screw in example 3;

FIG. 9 is an enlarged view of the line B in FIG. 8;

FIG. 10 is a schematic view of a ball 8a at the tip of the screw shaft 8 according to embodiment 3;

FIG. 11 is a schematic view of the screw insertion of embodiment 4.

The specific implementation mode is as follows:

example 1:

as shown in fig. 1-3 and fig. 6, a minimally invasive pedicle surgical instrument comprises a pedicle screw and an insertion guide device correspondingly matched with the pedicle screw, wherein the insertion guide device comprises a guide post 1, a conical narrowing part 1b coaxially distributed is arranged at the lower end part of the guide post 1, and a central through hole 1a is arranged on the guide post 1 and the narrowing part 1b along the axial line. The guide post 1 and the narrowing part 1b are of an integrated structure.

The outer side of the guide post 1 is inserted and sleeved with a first sleeve 2, and the lower end part of the first sleeve 2 is provided with a first conical narrowing part 2a which is coaxially distributed. The inner wall of the first sleeve 2 and the first sleeve 2 are coaxially distributed and axially penetrate through the first sleeve 2 and the first narrowing portion 2 a. The horizontal section of the inner cylinder wall of the first sleeve 2 is circular, and the diameter of the inner cylinder wall is slightly larger than that of the guide pillar 1. So that the first sleeve 2 and the first narrowing 2a can be threaded on the outer wall of the guide post 1 and can slide back and forth along the axial direction of the guide post 1. The first sleeve 2 and the first narrowing portion 2a are of an integral structure.

The length of the guide post 1 is larger than that of the first sleeve 2. After the first sleeve 2 is sleeved on the guide post 1, the upper end of the guide post 1 extends out of the upper end of the first sleeve 2, so that a doctor can draw out the guide post 1.

The second sleeve 3 is inserted and sleeved outside the first sleeve 2, and a second conical narrowing part 3a which is coaxially distributed is arranged at the lower end part of the second sleeve 3. The inner wall of the second sleeve 3 is coaxial with the second sleeve 3 and axially penetrates through the second sleeve 3 and the second narrowing portion 3 a. The horizontal section of the inner cylinder wall of the second sleeve 3 is circular and the diameter is slightly larger than that of the first sleeve 2. So that the second sleeve 3 and the second narrowing 3a can be threaded on the outer wall of the first sleeve 2 and can slide back and forth axially along the first sleeve 2. The second sleeve 3 and the second narrowing 3a are of an integral structure.

The length of the first sleeve 2 is greater than the length of the second sleeve 3. So that the upper end of the first sleeve 2 extends beyond the upper end of the second sleeve 3 after the second sleeve 3 is fitted over the first sleeve 2, so that the physician can withdraw the first sleeve 2 from the second sleeve 3.

A third sleeve 4 is inserted and sleeved outside the second sleeve 3, and a third conical narrowing part 4a which is coaxially distributed is arranged at the lower end part of the third sleeve 4. The inner wall of the third sleeve 4 and the third sleeve 4 are coaxially distributed and axially penetrate through the third sleeve 4 and the third narrowing portion 4 a. The horizontal section of the inner cylinder wall of the third sleeve 4 is circular, and the diameter of the inner cylinder wall of the third sleeve 4 is slightly larger than that of the second sleeve 3. So that the third sleeve 4 and the third narrowing 4a can be threaded over the outer wall of the second sleeve 3 and can slide axially back and forth along the second sleeve 3. The third sleeve 4 and the third narrowing portion 4a are of an integral structure.

The length of the second sleeve 3 is greater than the length of the third sleeve 4. After the third sleeve 4 is sleeved on the second sleeve 3, the upper end of the second sleeve 3 extends out of the upper end of the third sleeve 4, so that the doctor can withdraw the second sleeve 3 from the third sleeve 4.

A fourth sleeve 5 is inserted and sleeved outside the third sleeve 4, and a conical fourth narrowing part 5a is coaxially distributed at the lower end part of the fourth sleeve 5. The inner wall of the fourth sleeve 5 and the fourth sleeve 5 are coaxially distributed and axially penetrate through the fourth sleeve 5 and the fourth narrowing portion 5 a. The horizontal section of the inner cylinder wall of the fourth sleeve 5 is circular, and the diameter of the inner cylinder wall of the fourth sleeve 5 is slightly larger than that of the third sleeve 4. So that the fourth sleeve 5 and the fourth narrowing 5a can be threaded on the outer wall of the third sleeve 4 and can slide back and forth along the axial direction of the third sleeve 4.

A group of triangular sharp teeth 5b are uniformly distributed on the lower end part of the fourth narrowing part 5 a. A pair of horizontally distributed fins 6 are arranged at the upper end part of the fourth sleeve 5. A reinforcing rib 7 is arranged between each wing 6 and the outer wall of the fourth sleeve 5. The reinforcing rib 7 is of a right-angled triangle structure, hooks of the reinforcing rib 7 are fixedly welded with the fins 6, strands of the reinforcing rib 7 are fixedly welded with the outer wall of the fourth sleeve 5, and the string of the reinforcing rib 7 is an inwards concave arc 7 a. The fourth sleeve 5, the fourth narrowing portion 5a and the sharp teeth 5b are of an integral structure. The inner wall of the fourth sleeve 5 is also carved with vertically distributed height scale bars 5 c.

The length of the third sleeve 4 is greater than the length of the fourth sleeve 5. After the fourth sleeve 5 is sleeved on the third sleeve 4, the upper end part of the third sleeve 4 extends out of the upper end of the fourth sleeve 5, so that the doctor can draw out the third sleeve 4 from the fourth sleeve 5.

The pedicle screw comprises a solid screw rod 8, a U-shaped screw seat 9 is connected to the upper end of the screw rod 8, and the screw rod 8 and the U-shaped screw seat 9 are of an integrated structure.

The outer walls of the two sides of the U-shaped nail seat 9 are respectively provided with an arc surface 9a correspondingly matched with the inner wall of the fourth sleeve 5, and the distance between the arc tops of the two arc surfaces 9a is smaller than the diameter of the lower end of the fourth narrowing part 5 a. So that the fourth sleeve can be removed after the pedicle screw is placed in the bone.

The top ends of the outer walls of the two sides of the U-shaped nail seat 9 are integrally connected with tail fins 9b, and the joints of the tail fins 9b and the top ends of the outer walls of the two sides of the U-shaped nail seat 9 are provided with grooves 9 c. The groove 9c is an arc-shaped through groove, and the circle center of the groove is the same as that of the arc surface 9 a.

A gland 9d is arranged in the U-shaped nail seat 9, and the outer circular surface of the gland 9d is provided with threads correspondingly matched with the inner walls of the two sides of the U-shaped nail seat 9. A gland locking groove 9e is arranged on the gland 9d, and a pedicle screw locking groove 10 is arranged on the U-shaped nail seat 9 below the gland 9 d. The diameter of the gland locking groove 9e is larger than that of the pedicle screw locking groove 10.

Example 2:

as shown in fig. 1, 2, 4, 5 and 7, a minimally invasive pedicle surgical instrument comprises a pedicle screw and an insertion guide device correspondingly matched with the pedicle screw, wherein the insertion guide device comprises a guide post 1, conical narrowing portions 1b which are coaxially distributed are arranged at the lower end part of the guide post 1, and central through holes 1a are formed in the guide post 1 and the narrowing portions 1b along the axial line. The guide post 1 and the narrowing part 1b are of an integrated structure.

The pedicle screw comprises a solid screw rod 8 and a U-shaped screw seat 9, the outer walls of two sides of the U-shaped screw seat 9 are respectively provided with an arc surface 9a correspondingly matched with the inner wall of the fourth sleeve 5, and the distance between the arc tops of the two arc surfaces 9a is smaller than the diameter of the lower end of the fourth narrowing portion 5 a. So that the fourth sleeve can be removed after the pedicle screw is placed in the bone.

The bottom of the U-shaped nail seat 9 is provided with a through hole 12, the inner wall of the through hole 12 is provided with a cambered surface, and a solid screw rod 8 is inserted into the through hole 12. The top end of the screw rod 8 is provided with a ball head 8a which is correspondingly matched with the cambered surface on the inner wall of the through hole 12, the top of the ball head 8a is provided with a sunken locking groove 8b, and the locking groove 8b is in a shape of a straight line, a cross, a square or a hexagonal prism. The ball head 8a and the screw rod 8 are of an integrated structure, and the screw pitch on the screw rod is wide.

A pressing piece 11 is arranged in the U-shaped nail seat 9 on the ball head 8a, the outer wall of the pressing piece 11 is provided with threads correspondingly matched with the inner wall of the U-shaped nail seat 9, and the bottom of the pressing piece 11 is provided with a spherical groove 11b capable of covering the upper end part of the ball head 8 a.

Be equipped with on the tank bottom of spherical groove 11b and lock groove 8b to the complex hole of stepping down 11a, the hole of stepping down 11a diameter be greater than the diameter of locking groove 8b, hole of stepping down 11a is hexagonal prism shape, is equipped with the sphere that corresponds the complex with bulb 8a at the lower extreme opening part.

The top ends of the outer walls of the two sides of the U-shaped nail seat 9 are integrally connected with tail fins 9b, and the joints of the tail fins 9b and the top ends of the outer walls of the two sides of the U-shaped nail seat 9 are provided with grooves 9 c. A gland 9d is arranged in the U-shaped nail seat 9 above the pressing piece 11, the outer circular surface of the gland 9d is provided with threads correspondingly matched with the inner walls of the two sides of the U-shaped nail seat 9, and a gland locking groove 9e is arranged on the gland 9 d. The diameter of the gland locking groove 9e is larger than that of the yielding hole 11a, and the diameter of the yielding hole 11a is larger than that of the locking groove 8 b.

Due to the existence of the ball head, the pedicle screw can obtain a larger swing angle, and the post-operation movement of a patient is more free.

Example 3:

as shown in fig. 1, 2, 8, 9 and 10, the minimally invasive pedicle surgical instrument comprises a pedicle screw and an embedding guide device correspondingly matched with the pedicle screw, wherein the embedding guide device comprises a guide post 1, conical narrowing portions 1b which are coaxially distributed are arranged at the lower end part of the guide post 1, and a central through hole 1a is formed in the guide post 1 and the narrowing portions 1b along the axial line. The guide post 1 and the narrowing part 1b are of an integrated structure.

The bottom of the U-shaped nail seat 9 is provided with a through hole 12, the inner wall of the through hole 12 is provided with a cambered surface, and a solid screw rod 8 is inserted into the through hole 12. Two arc-shaped sliding grooves 12a which are symmetrically distributed are arranged on the inner wall of the through hole 12, and the upper ends of the arc-shaped sliding grooves 12a are provided with openings so that a sliding block 8c mentioned below can be placed into the arc-shaped sliding grooves 12 a.

The top end of the screw rod 8 is provided with a ball head 8a which is correspondingly matched with the cambered surface on the inner wall of the through hole 12, the top of the ball head 8a is provided with a sunken locking groove 8b, and the locking groove 8b is in a shape of a straight line, a cross, a square or a hexagonal prism. The ball head 8a and the screw rod 8 are of an integrated structure, and the screw pitch on the screw rod is wide.

The spherical surfaces of the ball heads 8a at two sides of the locking groove 8b are respectively provided with a segment of slide blocks 8c distributed in an arc shape, and a certain distance is arranged between each slide block 8c and the corresponding locking groove 8 b. The slide block 8c is inserted into the arc chute 12a and can slide in the arc chute 12a, so that the screw rod 8 has a function of moving left and right along the arc chute 12 a.

The structure of the guiding device in the embodiment 3 is the same as that in the

embodiments

1 and 2, and the matching relationship of the pedicle screw and the guiding device is also the same, so that the schematic drawing of the embodiment 3 for inserting the screw is not shown in the drawing, and the skilled person can understand the structure by referring to the figures 3 and 4.

Example 4:

as shown in fig. 1, 2 and 11, a minimally invasive pedicle surgical instrument comprises a pedicle screw and an insertion guide device correspondingly matched with the pedicle screw, wherein the insertion guide device comprises a guide post 1, a conical narrowing part 1b which is coaxially distributed is arranged at the lower end part of the guide post 1, and a central through hole 1a is arranged on the guide post 1 and the narrowing part 1b along the axial line. The guide post 1 and the narrowing part 1b are of an integrated structure.

The pedicle screw comprises a solid screw shaft 8 and a staple holder 9. The top of the screw rod 8 is provided with an integrally formed conical screw cap 8a, and the top end of the conical screw cap 8a is provided with a pedicle screw locking groove 10.

The bottom of the U-shaped nail seat 9 is provided with a conical hole 13 correspondingly matched with the conical nail head 8a, so that the conical nail head 8a can be clamped in the conical hole 13, and the screw rod 8 and the conical hole 13 form coaxial rotating fit. The conical bore 13 prevents the conical nut 8a from escaping therefrom and ensures that the staple holder 9 and the screw shaft 8 rotate relative to one another.

A gland 9d is arranged in the U-shaped nail seat 9, and the outer circular surface of the gland 9d is provided with threads correspondingly matched with the inner walls of the two sides of the U-shaped nail seat 9. A gland locking groove 9e is provided on the gland 9 d. The diameter of the gland locking groove 9e is larger than that of the pedicle screw locking groove 10.

The above-mentioned embodiments are only several preferred embodiments of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and drawings of the present invention can be changed or directly or indirectly used in other related technical fields, and all the same principles are included in the protection scope of the present invention.

The use process comprises the following steps:

during operation, firstly, a trocar in the prior art is used for puncturing the body of a patient, so that a needle core reaches the vertebral pedicle, a sleeve is also inserted into the body together, then the needle core is extracted, then a guide wire is inserted into the body of the patient from one end of the sleeve, the guide wire is inserted into the vertebral pedicle, the operation position is marked, and finally the sleeve is removed. The trocar comprises a needle core and a sleeve which is sleeved outside the needle core, and the structure of the trocar is not described in detail since the trocar is the prior art.

The skin opening left by the removal cannula is then flared using a prior art surgical mouth gag. Then insert the guide wire upper end from the central through-hole of guide pillar for the guide pillar is worn on the guide wire, and then insert the constriction part downwards in the patient body, until the constriction part lower extreme reaches the pedicle of vertebral arch, and then wear the cover in first, two, three, four sleeves step by step outside the guide pillar, make the lower extreme of first, two, three, four constriction parts all reach the pedicle of vertebral arch. (the first, second, third, and fourth tapered portions of the cone shape also facilitate insertion into the skin and into the patient)

Because the diameters of the first sleeve, the second sleeve, the third sleeve and the fourth sleeve are gradually increased, the soft tissues of the body are expanded by gradually penetrating the first sleeve, the second sleeve, the third sleeve and the fourth sleeve. After the lower end of the fourth narrowed part reaches the pedicle of vertebral arch, the fourth sleeve is held by hand, and the tiger mouth part is contacted with the strings of the arc-shaped reinforcing ribs 7, so that the fourth sleeve is tightly held. And then a hammer is used for knocking the wing panel to drive the sharp teeth at the lower end part of the fourth narrowed part into the bone of the vertebral pedicle.

Then the guide wire, the guide pillar, the first, the second and the third sleeve are gradually drawn out from the inside to the outside, then the pedicle screw with the screw rod in the solid state is inserted into the inner cylinder wall of the fourth sleeve, at this time, the pedicle screw can directly fall to the operation position under the guidance of the inner cylinder wall of the fourth sleeve, then the pedicle screw with the screw rod in the solid state is screwed into the pedicle of vertebral arch through a special tool (the special tool is the existing pedicle screw T-shaped wrench, one end of the pedicle screw T-shaped wrench extends to form a plug-in part which is in plug-in fit with a locking groove of the pedicle screw), the screw rod is screwed into the pedicle of vertebral arch (in the embodiment 2, the screw rod is firstly screwed into the pedicle of vertebral arch through the special tool, then the pressing piece is screwed into the ball head, then the connecting rod is placed in the two adjacent U-shaped screw seats, and the two ends of the connecting, and then the tail wing is broken off through the groove, so that the connection of the two pedicle screws is completed.

In addition, the screwing depth of the pedicle screw can be accurately mastered by observing the position change between the upper end of the empennage and the scales in the process of screwing the pedicle screw into the pedicle screw.

Through this technical scheme for the pedicle of vertebral arch screw that the screw pole is solid state can apply to among the minimal access surgery, because this application provides the operation passageway that the accuracy reachd the operation position for the pedicle of vertebral arch screw of solid state for the screw pole. Because the pedicle screw with the screw rod in a solid state has higher strength, the fracture of the screw body can be realized, the operative wound of a patient is reduced, and the operative complications are reduced, so that the quick recovery speed of the operation is greatly improved.

The guiding of the inner cylinder wall of the fourth sleeve also avoids the situation that the pedicle screws are screwed askew in the operation, greatly improves the success rate of the pedicle screw implantation, shortens the operation time, reduces the operation difficulty of doctors, and improves the operation success rate.

The guide device of the present application may also be used in conjunction with solid pedicle screws as found in the prior art.

Claims

1. A pedicle of vertebral arch minimal access surgery apparatus which characterized in that: the pedicle screw embedding guide device comprises a pedicle screw and an embedding guide device correspondingly matched with the pedicle screw, wherein the embedding guide device comprises a guide pillar (1), a central through hole (1 a) is formed in the guide pillar (1), a first sleeve (2) is sleeved on the guide pillar (1), a second sleeve (3) is sleeved on the first sleeve (2), a third sleeve (4) is sleeved on the second sleeve (3), a fourth sleeve (5) is sleeved on the third sleeve (4), a pair of wing pieces (6) is arranged at the upper end part of the fourth sleeve (5), and a group of sharp teeth (5 b) is arranged at the lower end part of the fourth sleeve (5); the pedicle screw comprises a solid screw rod (8), a U-shaped screw seat (9) is connected to the upper end of the screw rod (8), a cambered surface (9 a) matched with the inner wall of the fourth sleeve (5) is arranged on the outer wall of the U-shaped screw seat (9), a tail wing (9 b) is integrally connected to the top ends of the two walls of the U-shaped screw seat (9), and a groove (9 c) is formed in the joint of the tail wing (9 b) and the top ends of the two walls of the U-shaped screw seat (9).

2. A pedicle minimally invasive surgical instrument as claimed in claim 1, wherein: the lower end of the guide post (1) is provided with a conical narrowing part (1 b), the lower end of the first sleeve (2) is provided with a first narrowing part (2 a), the lower end of the second sleeve (3) is provided with a second narrowing part (3 a), the lower end of the third sleeve (4) is provided with a third narrowing part (4 a), and the lower end of the fourth sleeve (5) is provided with a fourth narrowing part (5 a).

3. A pedicle minimally invasive surgical instrument as claimed in claim 1, wherein: and a reinforcing rib (7) is also arranged between the fin (6) and the fourth sleeve (5).

4. A pedicle minimally invasive surgical instrument as claimed in claim 1, wherein: u-shaped nail seat (9) bottom be equipped with through-hole (12), be equipped with the cambered surface on through-hole (12) inner wall, the cover is equipped with screw rod (8) in through-hole (12) top be equipped with the cambered surface correspond complex bulb (8 a), be equipped with locking groove (8 b) on bulb (8 a), be equipped with in U-shaped nail seat (9) on bulb (8 a) and correspond complex piece (11) that compresses tightly, be equipped with on compressing tightly (11) outer wall and correspond complex screw thread with U-shaped nail seat (9) inner wall, be equipped with on compressing tightly (11) and step down hole (11 a) corresponding with locking groove (8 b).

5. A pedicle minimally invasive surgical instrument as claimed in claim 1, wherein: the screw rod (8) is integrally arranged at the bottom of the U-shaped nail seat (9), a gland (9d) is connected with the inner thread of the U-shaped nail seat (9), and a locking hole (12 a) is formed in the gland (9 d).