CN219021482U - Pedicle screw placement instrument and pedicle screw system - Google Patents

Abstract

The utility model discloses a pedicle screw placement instrument and a pedicle screw system, and belongs to the technical field of medical instruments, wherein the pedicle screw placement instrument comprises a screw feeding device for implanting a pedicle screw rod into a vertebral body, the screw feeding device comprises a driving screwdriver, the driving screwdriver comprises a driving rod, the front end of the driving rod is provided with a driving head and a nail head external holding, and the nail head external holding is provided with a longitudinal slot so that the front part of the nail head external holding is in split arrangement; the outer side of the outer clamp of the nail head is sleeved with an outer pipe which can axially move relative to the outer clamp of the nail head and can drive the outer clamp of the nail head to clamp the nail head of the pedicle screw rod in the axial movement process. The pedicle screw placement instrument and the pedicle screw system are suitable for pedicle screws of split structures, the screws are not easy to drop, and the operation is convenient.

Description

Pedicle screw placement instrument and pedicle screw system

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a pedicle screw placement instrument and a pedicle screw system.

Background

Spinal lesions are diseases that seriously affect the health of a patient, and can affect not only the mobility of the patient, but also the external appearance of the patient, and even paralysis in bed when the condition is serious. Spinal pathologies generally include various types of spinal arthritis, spinal fractures, scoliosis, and ankylosing spondylitis. The spinal fusion technology has obvious effects on treating spinal lesions, and has the advantages of little damage to the spinal column, keeping the activity and stability of the spinal column, reconstructing the biomechanical characteristics of the intervertebral disc, preventing and relieving the degeneration acceleration of the adjacent segment intervertebral disc, and the like, so that a plurality of hospitals have been adopted in recent years.

In the existing spine operation, doctors mostly adopt conventional pedicle screws to treat patients, the conventional pedicle screws generally comprise unidirectional nails and universal nails, a nail seat and a nail rod of the conventional pedicle screws are of an integrated structure or a connected structure, and when the nails are placed, the nail seat and the nail rod are required to be placed into an operation position at the same time, because the nails are attached, the volume is large, the visual field is narrow, the operation of placing the nails is inconvenient to observe in the operation, and the accuracy of placing the nails is low; in order to solve the problem, the prior art also provides a pedicle screw, wherein a screw seat and a screw rod are of a split structure, and when the screw is placed, the screw rod can be implanted onto a corresponding vertebral body first, and then the screw seat is installed.

For pedicle screws of an integral structure or a connection structure, more special nail placement machines are designed at present due to common use, however, for pedicle screws of a split structure, due to relatively fewer use, no special nail placement machine is currently used, the pedicle screws are still operated by using a conventional screwdriver, and the pedicle screws are easy to drop and inconvenient to operate.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a pedicle screw which is applicable to a split structure, is not easy to drop, and is convenient to operate.

In order to solve the technical problems, the utility model provides the following technical scheme:

in one aspect, a pedicle screw placement machine is provided, the pedicle screw includes nail seat and the nail pole that components of a whole that can function independently set up, the upper end of nail pole is equipped with the pin fin, pedicle screw placement machine is including being used for implanting the last nailing ware of pedicle screw nail pole into the centrum, it includes the drive screwdriver to go up nailing ware, the drive screwdriver includes the actuating lever, wherein:

the front end of the driving rod is provided with a driving head for driving the nail head of the pedicle screw rod and a nail head external clamp for clamping the nail head of the pedicle screw rod, and the nail head external clamp is provided with a longitudinal cutting groove extending along the length direction of the nail head external clamp, so that the front part of the nail head external clamp is in a split arrangement; the outer side of the outer clamp of the nail head is sleeved with an outer pipe which can axially move relative to the outer clamp of the nail head and can drive the nail head to clamp the nail head of the pedicle screw rod in the axial movement process.

Further, the nail head outer holding comprises a sleeve part fixedly arranged on the driving rod and a holding part positioned at the front end of the sleeve part, the longitudinal cutting groove is arranged on the holding part, and the outer tube is sleeved on the outer side of the sleeve part;

and/or the driving rod is provided with an adjusting device for driving the outer tube to axially move;

and/or the rear part of the driving rod is provided with a driving handle.

Further, the adjusting device comprises a locking block sleeved on the driving rod, the front part of the locking block is axially fixed and circumferentially rotatable and is in driving connection with the outer tube, and the rear part of the locking block is spirally assembled on the driving rod.

Further, the outer tube comprises a first tube part and a second tube part, wherein the first tube part is arranged at the front part and used for being sleeved outside the sleeve part, the second tube part is arranged at the rear part and used as a grab handle, the outer diameter of the second tube part is larger than that of the first tube part, and the front part of the locking block is axially fixed and rotationally driven and connected with the second tube part.

Further, an annular groove is formed in the rear end surface of the second pipe part, a pin hole is formed in the locking block at a position corresponding to the annular groove, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove;

and/or the middle part of the driving rod is provided with an annular boss, and the rear part of the locking block is spirally assembled on the annular boss;

and/or the sleeve part of the outer holding of the nail head is embedded and fixed on the driving rod, the inner diameter of the first pipe part is equal to the outer diameter of the driving rod, and the inner diameter of the second pipe part is larger than the outer diameter of the driving rod;

and/or the second pipe part is sleeved with an anti-skid sleeve;

and/or the driving handle is a ratchet wheel fast-assembling handle.

Further, the pedicle screw placement instrument further comprises a An Tou device for mounting the pedicle screw seat on the screw rod, the head mounting device comprises a sleeve and a core rod which is positioned in the sleeve and the front end of which passes out of the sleeve, wherein:

the front end of the core rod is provided with a guide positioning rod matched with the U-shaped groove of the pedicle screw seat, and the front end of the sleeve is provided with a thread section matched with the internal thread of the U-shaped groove of the pedicle screw seat at the rear of the guide positioning rod.

Further, the guide positioning rod is T-shaped;

and/or the rear end of the core bar is provided with a handle, and the rear end of the sleeve is axially fixed and circumferentially rotatably assembled on the handle;

and/or the front end of the sleeve is provided with a front expansion part at the rear of the threaded section, and the front end surface of the front expansion part forms a blocking surface for abutting against the upper end surface of the pedicle screw seat.

Further, the front end of handle is equipped with the spliced pole, sheathed tube rear end is equipped with back inflation portion, be equipped with in the back inflation portion with spliced pole matched with interface, wherein:

the outer surface of the rear expansion part forms a driving part for driving the sleeve to rotate;

and/or the plug-in column is provided with an annular groove, a pin hole is arranged at the position, corresponding to the annular groove, of the rear expansion part, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove.

On the other hand, a pedicle screw system is provided, including pedicle screw and above-mentioned pedicle screw nail instrument of putting, pedicle screw includes the nail seat and the nail pole that set up of components of a whole that can function independently, the nail seat has the U-shaped groove that is used for placing the connective bar, threaded connection has the plug screw in the U-shaped groove, the upper end of nail pole is equipped with the pin head.

Further, a gasket mounting hole communicated with the U-shaped groove is formed below the nail seat, a gasket capable of moving up and down is arranged in the gasket mounting hole, the gasket comprises an elastic mounting part positioned at the lower part and a connecting rod U-shaped bearing part positioned at the upper part, a ball socket matched with the nail head is arranged in the elastic mounting part, and a plurality of longitudinal grooves are formed in the elastic mounting part;

the gasket mounting hole comprises a gasket expansion groove and a gasket through hole positioned at the lower end of the gasket expansion groove, and the outer surface of the elastic mounting part comprises a clearance fit surface positioned at the upper part and matched with the gasket expansion groove and a locking fit surface positioned at the lower part and matched with the gasket through hole;

the lowest point of the groove of the U-shaped bearing part of the connecting rod is always higher than the lowest point of the groove of the U-shaped groove, the gasket moves downwards in the gasket mounting hole when the screw plug locks and fixes the connecting rod, and the ball socket of the elastic mounting part of the gasket covers the nail head, so that the nail head is locked and fixed in the ball socket of the elastic mounting part.

The utility model has the following beneficial effects:

the pedicle screw placing device comprises a driving screwdriver, wherein the driving screwdriver comprises a driving rod, a driving head for driving a screw head of a pedicle screw rod and a screw head external clamp for clamping the screw head of the pedicle screw rod are arranged at the front end of the driving rod, and a longitudinal cutting groove extending along the length direction of the screw head external clamp is arranged on the screw head external clamp, so that the front part of the screw head external clamp is in split arrangement; the outer side sleeve of the outer holding of the nail head is provided with an outer tube which can move axially relative to the outer holding of the nail head and can drive the outer holding of the nail head to hold the nail head of the pedicle screw rod in the axial movement process, so that the outer tube is driven to move axially relative to the outer holding of the nail head, the nail head can be used for holding the nail head of the pedicle screw rod outwards, the driving head of the driving screwdriver can be used for driving the nail head of the pedicle screw rod, so that the pedicle screw rod is implanted into a vertebral body, and the pedicle screw is suitable for pedicle screws in split structures, and the screw is not easy to drop and convenient to operate.

Drawings

FIG. 1 is a schematic view of the structure of the upper stapler of the pedicle screw stapling instrument of the utility model, wherein (a) is a front view, (b) is a side view, and (c) is a front sectional view;

FIG. 2 is a view showing the state of use of the upper stapler of the pedicle screw placement machine of the present utility model;

FIG. 3 is a schematic view of the structure of the An Tou instrument of the pedicle screw placement device of the utility model, wherein (a) is a front view, (b) is a side view, and (c) is a cross-sectional view;

FIG. 4 is a view showing the use of the An Tou instrument of the pedicle screw placement device of the utility model;

FIG. 5 is a schematic view of an exploded view of a pedicle screw in the pedicle screw system of the utility model;

FIG. 6 is an exploded cross-sectional view of a pedicle screw in the pedicle screw system of the utility model;

FIG. 7 is a schematic view of the structure of the pedicle screw holder of the pedicle screw system of the utility model, wherein (a) is a perspective view and (b) is a sectional view;

FIG. 8 is a schematic view of the structure of the shank of a pedicle screw in the pedicle screw system of the utility model, wherein (a) is a front view, (b) is a top view, and (c) is a line drawing of the outline;

fig. 9 is a schematic structural view of a washer of a pedicle screw in the pedicle screw system of the utility model, wherein (a) is a front view, (b) is a front sectional view, (c) is a side view, and (d) is a side sectional view.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

In one aspect, the present utility model provides a pedicle screw placement machine, as shown in fig. 1-9, the pedicle screw comprising a separately arranged nail seat 1 and a nail rod 2, the upper end of the nail rod 2 being provided with a nail head 21, the pedicle screw placement machine comprising an upper nailing device 8 for implanting the pedicle screw nail rod 2 into a vertebral body, the upper nailing device 8 comprising a driving screwdriver comprising a driving rod 81, wherein:

the front end of the driving rod 81 is provided with a driving head 83 for driving the nail head 21 of the pedicle screw rod 2 and a nail head outer holding member 84 for holding the nail head 21 of the pedicle screw rod 2, and the nail head outer holding member 84 is provided with a longitudinal cutting groove 843 extending along the length direction, so that the front part of the nail head outer holding member 84 is in a split arrangement; the outer tube 85 which can move axially relative to the outer nail-head clamp 84 and can drive the outer nail-head clamp 84 to clamp the nail head 21 of the pedicle screw rod 2 in the axial moving process is sleeved outside the outer nail-head clamp 84.

The pedicle screw placing device comprises a driving screwdriver, wherein the driving screwdriver comprises a driving rod, the front end of the driving rod is provided with a driving head for driving a nail head of a pedicle screw rod and a nail head external clamp for clamping the nail head of the pedicle screw rod, and the nail head external clamp is provided with a longitudinal cutting groove extending along the length direction of the nail head external clamp, so that the front part of the nail head external clamp is in split arrangement; the outer side cover that the pin head was embraced outward is equipped with can be relative the pin head and embraced axial displacement and can drive the pin head and embraced outward and hold the outer tube of pedicle screw nail pole pin head at axial displacement in-process, and the pin head of the pedicle screw nail pole is embraced outward to the pin head that drives outer tube like this and can make the pin head embraced outward and hold pedicle screw nail pole, utilizes the driving head of drive screwdriver can drive pedicle screw nail pole to implant the pedicle screw nail pole into the centrum, be applicable to split type structure's pedicle screw, the screw is difficult for dropping, convenient operation.

Further, the outer pin head holding member 84 may include a sleeve portion 841 fixedly provided on the driving rod 81 and a holding portion 842 provided at a front end of the sleeve portion 841, a longitudinal slot 843 is provided on the holding portion 842, and the outer tube 85 is sleeved outside the sleeve portion 841; specifically, the interior of the holding portion 842 may be in a ball-and-socket shape that is matched with the nail head 21 (specifically, may be in a ball shape, that is, a ball head) of the pedicle screw rod 2, so as to better hold the nail head 21 of the pedicle screw rod 2. The driving rod 81 may be provided with an adjusting means for driving the outer tube 85 to move axially so as to drive the outer tube 85 to move axially. The driving lever 81 may be provided at the rear thereof with a driving handle 82 to facilitate the operation of the driving lever 81.

The use process of the utility model can be referred to as follows:

when the screw driver is used, the external holding 84 of the front end of the driving rod 81 of the driving screwdriver is held on the nail head 21 of the pedicle screw rod 2, the driving head 83 of the front end of the driving rod 81 is inserted into the instrument driving groove (plum blossom driving groove) 27 of the pedicle screw rod 2, then the outer tube 85 is driven by the adjusting device to move towards the direction close to the holding part 842 relative to the sleeve part 841 of the external holding 84 of the nail head, the outer tube 85 is gradually close to the holding part 842, in the process, the external holding 84 of the nail head is elastically deformed under the action of the longitudinal cutting groove 843 to gradually hold the nail head 21 of the pedicle screw rod 2 until the outer tube 85 is in contact with the end surface (left end surface in the figure) of the holding part 842, the external holding 84 of the nail head completely holds the nail head 21 of the pedicle screw rod 2, and finally the driving handle 82 of the driving screwdriver is rotated to drive the pedicle screw rod 2 to a proper position/height on a vertebral body, so that the implantation of the pedicle screw rod 2 is completed; when the upper nailing device needs to be removed, the adjusting device is used for driving the sleeve part 841 of the outer tube 85 opposite to the outer pin head holding part 84 to move towards the direction away from the holding part 842, the outer tube 85 is gradually away from the holding part 842, in the process, the outer pin head holding part 84 elastically deforms under the action of the longitudinal cutting groove 843 to restore to gradually loosen the pin head 21 of the pedicle screw rod 2, and the upper nailing device can be removed.

The adjusting device can take various structural forms which are easily conceivable by those skilled in the art, for example, the adjusting device is a handle fixedly arranged on the side surface of the outer tube; however, to precisely adjust the axial movement of outer tube 85 relative to sleeve portion 841 of stud-holding member 84, the present utility model preferably takes the form of:

as shown in fig. 1, the adjusting device may include a locking block 86 sleeved on the driving rod 81, a front portion of the locking block 86 is axially fixed, circumferentially rotatable, and driving-coupled outer tube 85, and a rear portion of the locking block 86 is screw-fitted on the driving rod 81. At this time, the locking block 86 is driven to rotate, and the locking block 86 can drive the outer tube 85 to precisely adjust the outer tube 85 to axially move relative to the sleeve portion 841. The outer surface of the locking block 86 may be provided with longitudinal ribs to increase friction and facilitate hand-held operation.

Further, the outer tube 85 may include a first tube portion 851 located at the front portion and used for being sleeved outside the sleeve portion 841, and a second tube portion 852 located at the rear portion and used as a handle, the outer diameter of the second tube portion 852 is larger than that of the first tube portion 851, and the front portion of the locking block 86 is axially fixed and rotationally driven to connect with the second tube portion 852, so that an operator can hold the second tube portion 852 with one hand and rotate the driving handle 82 of the driving screwdriver with the other hand, and the pedicle screw rod 2 is driven into a suitable position/height on the vertebral body, and the second tube portion 852 can play a role of assisting in holding and fixing, so that the operation process is more stable. The outer surface of the first tube part 851 may be provided with a window 855 to facilitate viewing of the sleeve part 841 position and to reduce friction when the first tube part 851 moves.

In order to axially fix the front portion of the locking block 86 and rotationally drive the second pipe portion 852, the present utility model preferably adopts the following structure:

as shown in fig. 1, the rear end surface of the second pipe portion 852 may be provided with an annular groove, a pin hole is provided at a position corresponding to the annular groove on the locking block 86, a pin 853 is provided in the pin hole, and the end of the pin 853 extends into the annular groove.

In order to screw the rear portion of the locking block 86 to the driving rod 81, the middle portion of the driving rod 81 may be provided with an annular boss 811, and the rear portion of the locking block 86 is screw-fitted to the annular boss 811. Sleeve portion 841 of pin head outer holding 84 can be embedded and fixed on driving rod 81, the inner diameter of first tube portion 851 is equal to the outer diameter of driving rod 81, the inner diameter of second tube portion 852 is greater than the outer diameter of driving rod 81, so that in the axial moving process of outer tube 85 relative to sleeve portion 841 driven by locking block 86, only first tube portion 851 is in contact/sliding fit with driving rod 81, second tube portion 852 is not in contact with driving rod 81, friction force is reduced, and axial moving of outer tube 85 relative to sleeve portion 841 is facilitated. The second pipe 852 may be sleeved with an anti-slip sleeve 854 (made of POM or PPSU) to increase friction force, so as to facilitate hand-held operation.

The driving handle 82 is preferably a ratchet wheel fast-assembling handle, so that in the process of rotating the driving handle 82 to place nails, the driving handle 82 can only drive the driving rod 81 to rotate towards the screwing direction of the pedicle screw rod 2, the reverse direction is convenient to operate, the operation is convenient, the operation is detachable, the placement and the carrying are convenient, and other screwdriver tools with similar fast-assembling interfaces can be matched. 821 is the ratchet quick-assembly structure of the handle.

As shown in fig. 3-4, the pedicle screw placement instrument may further comprise a head rest 9 for mounting the pedicle screw holder 1 on the screw rod 2, the An Tou rest 9 comprising a sleeve 91 and a core rod 92 located within the sleeve 91 with a front end penetrating out of the sleeve 91, wherein:

the front end of the core rod 92 is provided with a guide positioning rod 93 matched with the U-shaped groove 11 of the pedicle screw holder 1, and the front end of the sleeve 91 is provided with a thread 95 section matched with the internal thread of the U-shaped groove 11 of the pedicle screw holder 1 at the rear of the guide positioning rod 93.

When the screw seat is used, the handle 94 of the head setting device 9 is held by hand, the guide positioning rod 93 at the front end of the core rod 92 is inserted into the opening of the U-shaped groove 11 of the pedicle screw seat 1, so that the rotational freedom degree of the pedicle screw seat 1 can be limited, then the threaded section 95 at the front end of the sleeve 91 is aligned with the opening of the U-shaped groove 11 of the pedicle screw seat 1 and drives the sleeve 91 to rotate, the threaded section 95 at the front end of the sleeve 91 is meshed with the internal thread 16 of the U-shaped groove 11, so that all the freedom degrees of the pedicle screw seat 1 can be limited, the pedicle screw seat 1 is firmly held and taken, and finally an operator can transversely or vertically hold the handle 94 to buckle the pedicle screw seat 1 on the nail head 21 of the nail rod 2, so that the assembly of the nail seat 1 and the nail rod 2 is completed. The head mounting device 9 in this embodiment has a compact and lightweight overall design size, is convenient to operate, and is designed with a core rod 92 and a handle 94 as a whole, so that when the nail seat 1 and the nail rod 2 in the surgical operation have interference, appropriate knocking can be performed.

Further, the guiding and positioning rod 93 may be T-shaped to better limit the rotational freedom of the pedicle screw holder 1. The rear end of the core 92 may be provided with a handle 94, and the rear end of the sleeve 91 is axially fixed and circumferentially rotatably fitted on the handle 94 to facilitate the hand-held operation of the core 92.

Further, the front end of the sleeve 91 may be provided with a front expansion portion 911 at the rear of the threaded section 95, and a blocking surface 912 for abutting against the upper end surface of the pedicle screw seat 1 is formed on the front end surface of the front expansion portion 911 to limit the screwing depth of the threaded section 95, so that the pedicle screw seat 1 can be firmly held and taken when the blocking surface 912 is attached to the upper end surface of the pedicle screw seat 1 during operation, and the stress of the threaded section 95 can be dispersed, so as to avoid deformation failure caused by overlarge stress of the threaded section 95. The outer surface of the sleeve 91 may be provided with a window 916 to facilitate viewing the position of the core pin 92 and to reduce friction during rotation of the sleeve 91.

In order to allow the rear end of the sleeve 91 to be axially fixed and circumferentially rotatably fitted to the handle 94, the present utility model preferably adopts the following configuration:

as shown in fig. 3, the front end of the handle 94 may be provided with a plug 941, the rear end of the sleeve 91 is provided with a rear expansion portion 913, a plug 914 matching with the plug 941 is provided in the rear expansion portion 913, an annular groove is provided on the plug 941, a pin hole is provided at a position corresponding to the annular groove on the rear expansion portion 913, a pin 915 is provided in the pin hole, and the end of the pin 915 extends into the annular groove. The outer surface of the rear expansion 913 may form a driving portion for driving the rotation of the sleeve 91 so as to facilitate the rotation of the sleeve 91. The outer surface of the driving part can be provided with longitudinal ribs so as to increase friction force and facilitate handheld operation.

In another aspect, the present utility model provides a pedicle screw system, as shown in fig. 1-9, comprising a pedicle screw and the pedicle screw placement device described above, the pedicle screw comprising a separately arranged screw seat 1 and a screw rod 2, the screw seat 1 having a U-shaped groove 11 for placing a connecting rod (titanium rod), the U-shaped groove 11 being internally threaded with a screw plug (not shown), the upper end of the screw rod 2 being provided with a screw head 21. The structure of the pedicle screw placement device is the same as that of the pedicle screw placement device, so that the details are not repeated here.

The pedicle screw system comprises a pedicle screw loading device, wherein the pedicle screw loading device comprises a driving screwdriver, the driving screwdriver comprises a driving rod, a driving head for driving a screw head of a pedicle screw rod and a screw head external clamp for clamping the screw head of the pedicle screw rod are arranged at the front end of the driving rod, and a longitudinal cutting groove extending along the length direction of the screw head external clamp is formed in the screw head external clamp, so that the front part of the screw head external clamp is in split arrangement; the outer side sleeve of the outer holding of the nail head is provided with an outer tube which can move axially relative to the outer holding of the nail head and can drive the outer holding of the nail head to hold the nail head of the pedicle screw rod in the axial movement process, so that the outer tube is driven to move axially relative to the outer holding of the nail head, the nail head can be used for holding the nail head of the pedicle screw rod outwards, the driving head of the driving screwdriver can be used for driving the nail head of the pedicle screw rod, so that the pedicle screw rod is implanted into a vertebral body, and the pedicle screw is suitable for pedicle screws in split structures, and the screw is not easy to drop and convenient to operate.

Aiming at the specific structure of the pedicle screw, the utility model preferably adopts the following structural form:

as shown in fig. 7 and 9, a washer mounting hole 12 communicated with the U-shaped groove 11 may be arranged below the nail seat 1, a washer 5 capable of moving up and down is arranged in the washer mounting hole 12, the washer 5 comprises an elastic mounting part 51 positioned at the lower part and a connecting rod U-shaped bearing part 52 positioned at the upper part, a ball socket 53 matched with the nail head 21 is arranged in the elastic mounting part 51, and a plurality of longitudinal grooves 54 are arranged on the elastic mounting part 51;

the gasket mounting hole 12 includes a gasket expansion groove 121 and a gasket through hole 122 located at a lower end of the gasket expansion groove 121 (the gasket 5 is assembled into the gasket mounting hole 12 from bottom to top), the outer surface of the elastic mounting portion 51 includes a clearance fit surface 511 located at an upper portion to be fitted with the gasket expansion groove 121 and a lock fit surface 512 located at a lower portion to be fitted with the gasket through hole 122, and the gasket expansion groove 121 plays a role in buffering and avoiding the gasket 5;

the lowest point of the groove of the U-shaped bearing part 52 of the connecting rod is always higher than the lowest point of the groove of the U-shaped groove 11, when the screw plug locks and fixes the connecting rod, the gasket 5 moves downwards in the gasket mounting hole 12 and the ball socket 53 of the elastic mounting part 51 of the gasket 5 covers the nail head 21, so that the nail head 21 is locked and fixed in the ball socket 53 of the elastic mounting part 51.

When the screw driver is used in operation, the screw driver 8 is used for holding the screw rod 2 to implant the screw rod 2 on a corresponding vertebral body, after the screw placement is finished, the head setting device 9 is used for holding the screw seat 1 assembled with the washer 5, the screw seat 1 is buckled on the screw head 21 at the upper end of the screw rod 2, the connecting rod is placed in the U-shaped groove 11 of the screw seat 1, then the holding screw plug is screwed in along the U-shaped groove 11, along with the continuous screwing in of the screw plug, the lower end face of the screw plug is gradually attached to and presses the connecting rod, the connecting rod presses the U-shaped bearing part 52 of the connecting rod of the washer 5, the washer 5 moves downwards in the washer mounting hole 12, the elastic mounting part 51 of the washer 5 is gradually close to the screw head 21 of the screw rod 2 and transmits force in the direction of the screw head 21, the washer expansion groove 121 is propped open by the screw head 21, the elastic mounting part 51 wraps 21 to form a matched structure, the matched structure is continuously screwed in the screw plug, the locking face 512 of the elastic mounting part 51 is gradually close to the through hole 122 and is matched with the inner surface of the through hole 122, the connecting rod is pressed and the connecting rod is tightly locked in the U-shaped groove 53 when the screw is tightly attached to the screw head 11, and the screw is fixed in the screw groove is tightly attached to the screw head 11, and the screw is fixed in the vertebral body, and the screw is tightly fixed.

Compared with the prior art, the U-shaped bearing part 52 of the connecting rod in the embodiment can bear the pressure on the connecting rod after the screw plug is locked and fixed, and the pressure is uniformly transmitted to the washer 5 and the screw rod 2, so that the whole product reaches a good state, and the connecting rod is suitable for orthopedic operation. The longitudinal grooves 54 in this embodiment allow only elastic deformation of the gasket 5 without damage thereto.

Further, as shown in fig. 9 (b), the distance L from the lowest point of the groove of the connecting rod U-shaped carrier portion 52 to the opening end face thereof is preferably smaller than the diameter of the connecting rod to be connected, that is, the distance from the lowest quadrant point of the groove of the connecting rod U-shaped carrier portion 52 to the U-shaped opening end face thereof is smaller than the diameter of the connecting rod to be connected.

As shown in fig. 7 and 9, the side surface of the connection rod U-shaped bearing part 52 may be provided with a guide anti-rotation table 521, the side surface of the U-shaped groove 11 is provided with a guide anti-rotation groove 13 for vertically accommodating the guide anti-rotation table 521, the outer diameter of the connection rod U-shaped bearing part 52 at the guide anti-rotation table 521 is larger than the inner diameter of the gasket through hole 122, the connection rod U-shaped bearing part 52 can be obliquely installed into the gasket through hole 122, the guide anti-rotation table 521 and the guide anti-rotation groove 13 enable the gasket 5 to axially move up and down, the rotation of the gasket is prevented from affecting the final press bar locking, and the number of the guide anti-rotation tables 521 may be a pair and be located at both sides of the connection rod U-shaped bearing part 52.

The inner surface of the washer via 122 may include a straight surface at the lower portion and a tapered surface at the upper portion, i.e., the washer via 122 is a tapered hole with a straight surface; the locking joint surface 512 may be a conical surface matched with a conical surface at the upper part of the washer via hole 122, the conical surfaces of the washer via hole 122 and the locking joint surface 512 may have conical degrees of 15-40 degrees, such as 15 degrees, 35 degrees, 36 degrees, 38 degrees and 39 degrees, so as to improve the extrusion fit effect of the locking joint surface 512 of the elastic mounting portion 51 and the inner surface of the washer via hole 122, and further facilitate the ball socket 53 to hold/lock the fixing nail head 21, thereby ensuring the safety and reliability of the washer 5 and the nail head 21 of the nail rod 2 during the assembly process and the post-operation pedicle screw.

To prevent the washer 5 from backing out of the washer via 122, the minimum inside diameter of the washer via 122 is preferably smaller than the maximum outside diameter of the resilient mounting portion 51 when the washer 5 is not spread. The middle of the washer 5 may be provided with a tool through hole 55 to facilitate the passage of tools, to facilitate the adjustment of the pedicle screw having placed the seat 1 on the rod 2 during surgery, including adjusting the height of the pedicle screw or removing the pedicle screw from the vertebral body, etc.

As shown in fig. 9, the inner surface of the ball socket 53 of the elastic mounting portion 51 may be provided with a plurality of transverse grooves 531, and the contact position between the transverse grooves 531 and the nail head 21 may be provided with a chamfer, so that a tool for machining the transverse grooves 531 can be saved in the machining process, burrs of products can be avoided, subsequent deburring treatment is omitted, machining cost is saved, and meanwhile, the transverse grooves 531 are matched with a three-line spiral groove structure or a parallel groove structure on the nail head 21 of the nail rod 2, so that optimal static friction force and balance can be achieved.

As shown in fig. 7, the outer surface of the lower end of the nail seat 1 can be a guiding cambered surface 14 designed by circular arc ending, so that the irritation damage to the tissue at the incision part can be reduced in the operation process of the product. The upper end of the nail seat 1 can be provided with a pair of lifting grooves 15 on two side walls of the U-shaped groove 11 so as to be matched with a lifting tool, and the distances from the pair of lifting grooves 15 to the upper end face of the nail seat 1 are the same for ensuring the unification of the tools.

As shown in fig. 8, the pin head 21 may be provided with a three-wire spiral groove structure or a parallel groove structure to increase friction between the pin head 21 and the ball socket 53, and to improve the firmness of the overall structure after the pedicle screw is finally locked. The threads 22 on the shank 2 are preferably of a double-thread configuration, which increases the speed of the shank 2 in the vertebral body during surgery.

As shown in fig. 8 (c), the large diameter profile and the small diameter profile of the thread 22 on the shank 2 may be in a shuttle structure, the shuttle structure includes a first tapered section 23 near the tip of the nail, a straight section 24 in the middle, and a second tapered section 25 near the head 21, where the first tapered section 23 and the second tapered section 25 are both gradually widened from the tip of the nail to the direction of the head 21, i.e., a shuttle structure of "taper+straight+taper", so that the thread of the first tapered section 23 of the shank 2 can be quickly screwed in when it enters the vertebral body, and the speed of the thread of the straight section 24 is gentle when it enters the vertebral body, and after the shank 2 is screwed in place, the thread of the second tapered section 25 can increase the pull-out resistance of the shank 2 in the vertebral body. The nail tip part of the nail rod 2 can be provided with a self-tapping groove 26, so that bone fragments can be conveniently discharged, and the nail placing speed is increased. The nail head 21 of the nail rod 2 can be provided with an instrument driving groove (plum blossom driving groove) 27 so as to facilitate the driving of the instrument, and compared with other driving modes, the plum blossom driving groove is uniformly contacted with the instrument, and the driving force is more stable and safer. The threads 16 in the U-shaped groove 11 of the cartridge 1 may be negative angle threads or hook lock threads.

In conclusion, the pedicle screw is a modularized series pedicle screw for spinal surgery, is a modularized split screw (in a reverse-installation mode), namely, the screw seat and the screw rod are in a non-connection structure before use, and the pedicle screw has a simple structure and high mechanical verification safety performance, and greatly improves the reduction of stock, lean production and management in the production process. The pedicle screw operation process is simple and convenient to operate, the screw placement accuracy is high, the observation is convenient in the operation, the repetition times in the operation process can be reduced or avoided, the screw seat with a short tail or a long tail can be selected according to the actual position in the operation when the screw is placed, the needs of minimally invasive operation or osteoporosis patients can be met, great convenience and safety assurance and more choices are brought to doctors in the operation process, the universal screw can be switched to the unidirectional screw in the operation, the screw placement operation device is convenient for the observation in the operation, the screw placement device is suitable for orthopedic operation, the incision height is low, and the incision diameter is small.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. Pedicle screw puts nail instrument, pedicle screw includes nail seat and the nail pole that the components of a whole that can function independently set up, the upper end of nail pole is equipped with the pin fin, pedicle screw puts nail instrument is including being used for implanting the last nail ware of pedicle screw nail pole into the centrum, its characterized in that, go up the nail ware including drive screwdriver, drive screwdriver includes the actuating lever, wherein:

the front end of the driving rod is provided with a driving head for driving the nail head of the pedicle screw rod and a nail head external clamp for clamping the nail head of the pedicle screw rod, and the nail head external clamp is provided with a longitudinal cutting groove extending along the length direction of the nail head external clamp, so that the front part of the nail head external clamp is in a split arrangement; the outer side of the outer clamp of the nail head is sleeved with an outer pipe which can axially move relative to the outer clamp of the nail head and can drive the nail head to clamp the nail head of the pedicle screw rod in the axial movement process.

2. The pedicle screw placement device according to claim 1, wherein the outer pin head embraces a sleeve part fixedly arranged on the driving rod and a holding part positioned at the front end of the sleeve part, the longitudinal cutting groove is arranged on the holding part, and the outer pipe is sleeved outside the sleeve part;

and/or the driving rod is provided with an adjusting device for driving the outer tube to axially move;

and/or the rear part of the driving rod is provided with a driving handle.

3. The pedicle screw placement device as claimed in claim 2, wherein the adjustment means comprises a locking block sleeved on the drive rod, the front part of the locking block being axially fixed, circumferentially rotatable in driving connection with the outer tube, the rear part of the locking block being screw-fitted on the drive rod.

4. A pedicle screw placement device as claimed in claim 3, wherein the outer tube comprises a first tube part at the front for being sleeved outside the sleeve part and a second tube part at the rear for being used as a handle, the outer diameter of the second tube part being larger than the outer diameter of the first tube part, the front part of the locking block being axially fixed, circumferentially rotatable in driving connection with the second tube part.

5. The pedicle screw placement device as claimed in claim 4, wherein the rear end surface of the second pipe part is provided with an annular groove, the locking block is provided with a pin hole at a position corresponding to the annular groove, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove;

and/or the middle part of the driving rod is provided with an annular boss, and the rear part of the locking block is spirally assembled on the annular boss;

and/or the sleeve part of the outer holding of the nail head is embedded and fixed on the driving rod, the inner diameter of the first pipe part is equal to the outer diameter of the driving rod, and the inner diameter of the second pipe part is larger than the outer diameter of the driving rod;

and/or the second pipe part is sleeved with an anti-skid sleeve;

and/or the driving handle is a ratchet wheel fast-assembling handle.

6. The pedicle screw placement instrument of claim 1, further comprising a An Tou device for mounting a pedicle screw seat on a rod, the headguard comprising a sleeve and a mandrel located within the sleeve and having a forward end passing out of the sleeve, wherein:

the front end of the core rod is provided with a guide positioning rod matched with the U-shaped groove of the pedicle screw seat, and the front end of the sleeve is provided with a thread section matched with the internal thread of the U-shaped groove of the pedicle screw seat at the rear of the guide positioning rod.

7. The pedicle screw placement device of claim 6, wherein the guide positioning rod is T-shaped;

and/or the rear end of the core bar is provided with a handle, and the rear end of the sleeve is axially fixed and circumferentially rotatably assembled on the handle;

and/or the front end of the sleeve is provided with a front expansion part at the rear of the threaded section, and the front end surface of the front expansion part forms a blocking surface for abutting against the upper end surface of the pedicle screw seat.

8. The pedicle screw placement device of claim 7, wherein the front end of the handle is provided with a plug post, the rear end of the sleeve is provided with a rear expansion portion, the rear expansion portion is internally provided with a plug interface matched with the plug post, wherein:

the outer surface of the rear expansion part forms a driving part for driving the sleeve to rotate;

and/or the plug-in column is provided with an annular groove, a pin hole is arranged at the position, corresponding to the annular groove, of the rear expansion part, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove.

9. A pedicle screw system, comprising a pedicle screw and the pedicle screw placement device of any one of claims 1-8, the pedicle screw comprising a separately arranged nail seat and a nail rod, the nail seat having a U-shaped groove for placing a connecting rod, the U-shaped groove being internally threaded with a plug screw, the upper end of the nail rod being provided with a nail head.

10. The pedicle screw system of claim 9, wherein a washer mounting hole communicating with the U-shaped groove is provided below the screw seat, a washer capable of moving up and down is provided in the washer mounting hole, the washer comprises a lower elastic mounting part and an upper connecting rod U-shaped bearing part, a ball socket matched with the screw head is provided in the elastic mounting part, and a plurality of longitudinal grooves are provided in the elastic mounting part;

the gasket mounting hole comprises a gasket expansion groove and a gasket through hole positioned at the lower end of the gasket expansion groove, and the outer surface of the elastic mounting part comprises a clearance fit surface positioned at the upper part and matched with the gasket expansion groove and a locking fit surface positioned at the lower part and matched with the gasket through hole;

the lowest point of the groove of the U-shaped bearing part of the connecting rod is always higher than the lowest point of the groove of the U-shaped groove, the gasket moves downwards in the gasket mounting hole when the screw plug locks and fixes the connecting rod, and the ball socket of the elastic mounting part of the gasket covers the nail head, so that the nail head is locked and fixed in the ball socket of the elastic mounting part.

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