CN211325540U

CN211325540U - Pedicle screw feeding device

Info

Publication number: CN211325540U
Application number: CN201922153129.7U
Authority: CN
Inventors: 魏会民; 陈继光; 赵光辉
Original assignee: Anyang Shengjie Technology Co ltd
Current assignee: Anyang Shengjie Technology Co ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-08-25
Anticipated expiration: 2029-12-05

Abstract

The utility model discloses a pedicle screw nailing device, which comprises an upper screw rod, wherein the head part of the upper screw rod is provided with an upper screw head, the tail part of the upper screw rod is fixedly connected with a quick-change connector, the upper screw rod is provided with a plurality of reducing parts, and the diameter of the reducing parts is smaller than that of the upper screw rod body; the screw thread overcoat is equipped with in last nail pole body overcoat, the coaxial grab handle that is provided with still in the outside of screw thread overcoat, the one end that the screw thread overcoat is close to last pin fin is provided with the external screw thread, the one end that the pin fin was kept away from to the screw thread overcoat is passed through bayonet lock fixedly connected with locking piece, set up locking device on the locking piece, the other end fixedly connected with nut of locking piece, the nut, the locking piece, the grab handle, the screw thread overcoat, go up the coaxial setting of nail pole, fixed connection forms rotatory whole between nut, the locking piece, the screw thread overcoat. The screw feeder has the characteristics of firm holding of the pedicle screws, convenience and universality, can obviously save operation time and cost, and reduces operation risks.

Description

Pedicle screw feeding device

Technical Field

The utility model particularly relates to a pedicle screw nailing device, which is mainly used in the posterior internal fixation operation of the spine and belongs to the technical field of orthopedic medical instruments.

Background

The spine is the middle shaft skeleton of human body, is located in the middle of the back, is connected with the skull at the upper end, reaches the tip of the coccyx at the lower end, can be divided into five sections of cervical vertebra, thoracic vertebra, lumbar vertebra, sacrum and coccyx, is the pillar of the body, and has the functions of loading, shock absorption, protection, movement and the like. The common clinical spine diseases comprise dislocation of vertebral bodies of the spine, scoliosis and the like, and if the spine diseases cannot be treated in time, serious pain, limb movement obstruction, visceral lesion and the like can be caused to a patient. The internal spinal fixation is usually adopted clinically, and during the operation, two rows of pedicle screws are usually screwed into the inner sides of a plurality of vertebral bodies respectively, and then the two rows of pedicle screws are connected by two connecting rods to form a screw rod system. The key implant pedicle screws are different in types required according to different disease conditions, the pattern difference is large, the pedicle screws can be divided into two categories, namely fixed uniaxial pedicle screws and multiaxial or universal pedicle screws, each category of screws can be divided into long-tail screws and short-tail screws according to the difference of tail nuts, doctors select the types of the pedicle screws according to the actual disease conditions in the operation process, sometimes the long-tail screws and the short-tail screws are required in the operation process, the existing screw feeding device cannot realize the universality between the long tail and the short tail, and the operation time is too long due to the fact that the doctors frequently replace screw feeding devices; simultaneously, the connection between the pedicle screw and the upper screw device is easy to loosen when the existing upper screw device is clinically used, so that the direction is easy to change when the pedicle screw is implanted, and the risk of an operation is increased.

Disclosure of Invention

The problem to prior art exists, the utility model provides a pedicle of vertebral arch screw goes up nail ware can solve prior art and go up the nail ware and control insecure easy not hard up to the pedicle of vertebral arch screw, to the not general problem of long tail and short-tailed pedicle of vertebral arch screw.

The technical scheme of the utility model is that: a pedicle screw nailing device comprises a cylindrical upper screw rod, wherein an upper screw head is arranged at the head of the upper screw rod, a quick-change connector is fixedly connected to the tail of the upper screw rod, a plurality of reducing parts with the same diameter are arranged on one side, close to the quick-change connector, of the upper screw rod, the reducing parts are arranged at intervals, and the diameter of each reducing part is smaller than that of the rod body of the upper screw rod; the screw thread outer sleeve is sleeved on the upper screw rod body between the upper screw head and the diameter reducing part closest to the upper screw head, the upper screw head extends out of the screw thread outer sleeve, an external screw thread is arranged at one end, close to the upper screw head, of the screw thread outer sleeve, one end, far away from the upper screw head, of the screw thread outer sleeve is fixedly connected with a locking block through a clamping pin, a locking device is arranged on the locking block, a screw cap is fixedly connected to the other end of the locking block, the diameter reducing parts on the upper screw rod penetrate through the locking block, and the tail part of the upper; the screw cap, the locking block, the thread outer sleeve and the upper nail rod are coaxially arranged, the screw cap, the locking block and the thread outer sleeve are fixedly connected to form a rotating whole, and the rotating whole can axially rotate around the upper nail rod or axially slide along the upper nail rod; the outer side of the thread outer sleeve is also coaxially provided with a grab handle, one end of the grab handle close to the upper nail head is rotatably connected with the thread outer sleeve through a snap spring, and the other end of the grab handle covers a bayonet lock on the locking block and is in clearance fit with the locking block.

Further, locking device includes button and spring, is provided with the lockhole on the button, goes up the nail pole and passes from the lockhole, and the cross-section of lockhole includes orthodrome and small circle arc, and the cambered surface of orthodrome is supporting with last nail pole body, and the cambered surface of small circle arc is supporting with the undergauge portion, the button and the spring butt of small circle arc one side, and the button of orthodrome one side exposes outward.

Furthermore, the outer surface of the grab handle is provided with an anti-skidding groove, and the outer surface of the locking block is provided with an anti-skidding bulge.

Furthermore, the shape of the upper nail head and the external thread is matched with that of the corresponding pedicle screw.

Further, the number of the diameter reducing portions is two.

Has the advantages that: the shape of the upper nail head is matched with a single-shaft or multi-shaft pedicle screw to be used for fastening the screw, the external thread of the head part of the thread outer sleeve can be screwed into the internal thread of a pedicle screw nut to effectively hold the pedicle screw, and meanwhile, the reduced diameter part of the upper nail rod is clamped through the small arc of the button lock hole on the lock block to prevent the holding from loosening; when screws with different tail lengths, such as long-tail screws or short-tail screws, need to be implanted in an operation, the spring can be pressed, a proper diameter-reducing part enters the lock hole, the thread outer sleeve is axially extended or shortened, the position of the external thread at the head of the thread outer sleeve is adjusted relative to the position of the internal thread of the pedicle screw nut, and the screw feeder can be simultaneously suitable for the long-tail and short-tail pedicle screws, so that the universality is enhanced, the operation time and cost are saved, and the operation risk is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a left side view and a front view of the button.

FIG. 4 is a schematic view of a quincunx upper head.

The labels in the figure are: 1 go up the nail pole, 11 go up the pin fin, 12 first undergauge portion, 13 second undergauge portion, 2 screw thread overcoat, 21 external screw threads, 3 grab handles, 31 anti-skidding recess, 32 jump ring, 33 pin, 4 locking pieces, 41 anti-skidding arch, 42 buttons, 421 small circle arc, 422 orthodrome, 43 springs, 5 nuts, 6 quick change coupler.

Detailed Description

The present invention will be described in more detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, a pedicle screw nailing device comprises an upper screw rod 1, a thread outer sleeve 2 and a grab handle 3 from inside to outside in sequence; the upper nail rod 1 is cylindrical, an upper nail head 11 is arranged at the head of the upper nail rod 1, and a quick-change connector 6 is fixedly connected to the tail of the upper nail rod 1; the upper nail head can be inserted into the nail seat of the pedicle screw, the shape of the upper nail head is matched with that of the nail seat of the pedicle screw, and the upper nail head shown in the figures 1 and 2 is in a cylindrical surface T shape and can be matched with a single-shaft pedicle screw for use; the upper head may also be shaped as a quincunx as shown in fig. 4, which may be used with a polyaxial pedicle screw.

A first reducing part 12 and a second reducing part 13 are arranged on one side of the upper nail rod close to the tail quick-change connector 6, the first reducing part 12 and the second reducing part 13 are arranged at intervals, and the diameters of the reducing parts are the same but smaller than the diameter of the upper nail rod body.

The screw thread jacket 2 is sleeved on the upper screw rod body between the upper screw head 11 and the first diameter reducing part 12, the upper screw head 11 extends out of the screw thread jacket 2, an external screw thread 21 is arranged at one end of the screw thread jacket close to the upper screw head, the shape of the external screw thread 21 is matched with the shape of the internal screw thread of the screw cap of the pedicle screw, and the external screw thread 21 can be screwed into the matched screw cap of the pedicle screw.

One end of the thread outer sleeve 2 far away from the upper nail head is fixedly connected with a locking block 4 through a bayonet 33, an anti-skid bulge 41 is arranged on the outer surface of the locking block 4, and a locking device is arranged on the locking block 4 and comprises a button 42 and a spring 43; as shown in fig. 3, a locking hole is formed in the button, the upper nail rod penetrates through the locking hole, the section of the locking hole comprises a large arc 422 and a small arc 421, the arc surface of the large arc 422 is matched with the rod body of the upper nail rod, the arc surface of the small arc 421 is matched with the first or second reducing part, the button on one side of the small arc is abutted to the spring 43, and the button on one side of the large arc is exposed outside.

The central hole diameter of the locking block 4 is large so as to accommodate the upper nail rod, the first diameter-reducing part 12 and the second diameter-reducing part 13 on the upper nail rod penetrate through the locking block, in order to prevent the locking block from shaking, the other end of the locking block 4 is fixedly connected with a screw cap 5, the central hole diameter of the screw cap 5 is small so as to play a role in stabilizing the upper nail rod, and the tail part of the nail rod penetrates out of the screw cap; the outer side of the thread outer sleeve 2 is also coaxially provided with a grab handle 3, the outer surface of the grab handle 3 is provided with an anti-skidding groove 31, one end of the grab handle close to the upper nail head is rotatably connected with the thread outer sleeve 2 through a clamp spring 32, and the other end of the grab handle 3 covers a clamp pin 33 on the locking block and is in clearance fit with the locking block 4. The screw cap 5, the locking block 4, the grab handle 3, the threaded outer sleeve 2 and the upper nail rod 1 are coaxially arranged.

The motion principle is as follows: the screw cap 5, the locking block 4 and the thread outer sleeve 2 are fixedly connected to form a rotating whole, and the rotating whole can axially rotate around the upper screw rod or axially slide along the upper screw rod; the grab handle 3 is limited by the clamp spring and can only rotate around the threaded outer sleeve; the button is pressed, the spring is compressed, the large arc moves towards the axis direction of the upper nail rod, the limit of the upper nail rod can be released, the upper nail rod can freely slide along the axial direction, the button is loosened, the spring jacks up the button, the small arc is abutted against the reducing part, and the rotation of the thread outer sleeve is limited.

When the pedicle screw is used in an operation, firstly, the type of the pedicle screw is selected according to an operation scheme, and a screw feeder matched with a rod head is selected; then the upper rod head is inserted into the nail seat of the pedicle screw, the grab handle is held, the button is pressed, the locking block is rotated, the external thread at the head part of the thread outer sleeve is screwed into the internal thread of the pedicle screw nut to effectively hold the pedicle screw, the button is loosened, the first or second diameter reducing part of the upper rod is clamped by the small arc of the button lockhole, the holding looseness is prevented, the clamped first or second diameter reducing part is matched with the long tail or the short tail of the pedicle screw nut, and the universality of the instrument is enhanced; then the quick-change connector at the tail part of the screw feeder is inserted into the driving handle, so that the pedicle screw can be accurately implanted into a body according to a specific direction under the rotation of the driving handle. After the implantation is finished, the spring is pressed, and the locking block is rotated to enable the external thread of the thread outer sleeve to be separated from the nut of the pedicle screw. Therefore, the screw feeder has the characteristics of firm holding of the pedicle screws, convenience and universality, can obviously save operation time and cost, and reduces operation risks.

Claims

1. The utility model provides a pedicle of vertebral arch screw goes up nail ware which characterized in that: the nail comprises a cylindrical upper nail rod, wherein an upper nail head is arranged at the head of the upper nail rod, a quick-change connector is fixedly connected to the tail of the upper nail rod, a plurality of diameter-reducing parts with the same diameter are arranged on one side, close to the quick-change connector at the tail, of the upper nail rod, and the diameter of each diameter-reducing part is smaller than that of the rod body of the upper nail rod; the screw thread outer sleeve is sleeved on the upper screw rod body between the upper screw head and the diameter reducing part closest to the upper screw head, the upper screw head extends out of the screw thread outer sleeve, an external screw thread is arranged at one end, close to the upper screw head, of the screw thread outer sleeve, one end, far away from the upper screw head, of the screw thread outer sleeve is fixedly connected with a locking block through a clamping pin, a locking device is arranged on the locking block, a screw cap is fixedly connected to the other end of the locking block, the diameter reducing parts on the upper screw rod penetrate through the locking block, and the tail part of the upper; the screw cap, the locking block, the thread outer sleeve and the upper nail rod are coaxially arranged, the screw cap, the locking block and the thread outer sleeve are fixedly connected to form a rotating whole, and the rotating whole can axially rotate around the upper nail rod or axially slide along the upper nail rod; the outer side of the thread outer sleeve is also coaxially provided with a grab handle, one end of the grab handle close to the upper nail head is rotatably connected with the thread outer sleeve through a snap spring, and the other end of the grab handle covers a bayonet lock on the locking block and is in clearance fit with the locking block.

2. A pedicle screw driver according to claim 1, wherein: locking device includes button and spring, is provided with the lockhole on the button, goes up the nail pole and passes from the lockhole, and the cross-section of lockhole includes orthodrome and small circle arc, and the cambered surface of orthodrome is supporting with last nail pole body, and the cambered surface of small circle arc is supporting with undergauge portion, the button and the spring butt of small circle arc one side, and the button of orthodrome one side exposes outward.

3. A pedicle screw driver according to claim 1, wherein: the outer surface of the grab handle is provided with an anti-skidding groove, and the outer surface of the locking block is provided with an anti-skidding bulge.

4. A pedicle screw driver according to claim 1, wherein: the shapes of the upper nail head and the external thread are matched with the corresponding pedicle screws.

5. A pedicle screw driver according to claim 1, wherein: the number of the diameter reducing parts is two.