CN112716582A

CN112716582A - Pedicle screw rod internal fixing device with positioning pin as inner core

Info

Publication number: CN112716582A
Application number: CN202011526472.2A
Authority: CN
Inventors: 谢子昂; 徐文斌; 宁磊; 范顺武
Original assignee: Affiliated Sir Run Run Shaw Hospital of School of Medicine Zhejiang University
Current assignee: Affiliated Sir Run Run Shaw Hospital of School of Medicine Zhejiang University
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-30
Anticipated expiration: 2040-12-22
Also published as: CN112716582B

Abstract

The invention discloses a pedicle screw rod internal fixing device taking a positioning pin as an inner core. The invention comprises a connecting rod, a pedicle screw body and a pin. The connecting rod is cylindrical; the side of the connecting rod is provided with scale marks. The pedicle screw main body comprises a separation part, a locking part and a screw part which are sequentially connected. The locking portion includes a locking disk and two locking ears. The two locking lugs are respectively connected with the edges of the two sides of the locking disc. After being installed on the human body, the connecting rod is positioned between the two locking lugs. The locking portion can be fixed and separated from different positions of the connecting rod. The outer end of the screw part is sharp. The main body of the pedicle screw is provided with a central hole which penetrates through the screw part and the locking disc and is used for being matched with the pin. The disengaging portion is separable from the locking portion.

Description

Pedicle screw rod internal fixing device with positioning pin as inner core

Technical Field

The invention belongs to the technical field of pedicle screws, and particularly relates to a pedicle screw and rod internal fixation system with a positioning pin as an inner core, which is mainly applied to orthopedic diseases requiring rod screw system internal fixation in operative treatment such as thoracolumbar fracture, intervertebral disc protrusion, spinal stenosis, spinal deformity, spinal infection, spinal tumor and the like.

Background

The pedicle screws which are used in the prior art at home and abroad are of two types: one is the conventional pedicle screw, such as GSS thoracolumbar internal fixation system, USS nail-bar system and Kohui, Wei high domestic system, etc., which are all solid screws, when PLIF, TLIF or MIS-TLIF minimally invasive surgery is adopted to place the pedicle screw, the guiding mark is lacked in the surgery, and C-arm X-ray machine is required to perform repeated fluoroscopy. The screw channel displacement is easy to occur when the screw is placed by hands, so that the track of the pedicle screw is deviated, and serious patients can generate spinal cord and nerve root stimulation symptoms due to the fact that the pedicle screw breaks into the vertebral canal, and disastrous consequences such as cerebrospinal fluid leakage, nerve root paralysis or paraplegia are caused. In addition, repeated intraoperative fluoroscopy results in prolonged overall surgical procedure time, increasing the risk of intraoperative infection; the other is a percutaneous inside fixation system of the Sextant pedicle screw produced by the overseas Shujiamo company, the pedicle screw part of the inside fixation system is designed to be hollow, but the U-shaped part at the top of the inside fixation system is shorter, so that the inside fixation system is not beneficial to the arrangement and the composition of a connecting rod.

Disclosure of Invention

The invention aims to provide a pedicle screw rod internal fixing system taking a positioning pin as an inner core.

The invention comprises a connecting rod, a pedicle screw body and a pin. The connecting rod is cylindrical; the side of the connecting rod is provided with scale marks. The pedicle screw main body comprises a separation part, a locking part and a screw part which are sequentially connected. The locking portion includes a locking disk and two locking ears. The two locking lugs are respectively connected with the edges of the two sides of the locking disc. After being installed on the human body, the connecting rod is positioned between the two locking lugs. The locking portion can be fixed and separated from different positions of the connecting rod. The outer end of the screw part is sharp. The main body of the pedicle screw is provided with a central hole which penetrates through the screw part and the locking disc and is used for being matched with the pin. The disengaging portion is separable from the locking portion.

Preferably, the disengagement part is arranged outside the locking part and comprises an outer fixing ring and two disengagement ears. The two disengaging lugs and the two locking lugs are respectively detachably connected.

Preferably, the inner ends of the two release lugs and the outer ends of the two locking lugs are screwed respectively, and the screw portion has a limit position in the rotation direction of the screw portion into the bone.

Preferably, the outer end rotary connection parts of the outer side surfaces of the two locking lugs are arranged in a concave manner; the inner rotary joint parts of the inner side surfaces of the two separation lugs are arranged in an inwards concave manner, so that the inner side surfaces and the outer side surfaces can be kept parallel and level when the locking lugs are in rotary joint with the separation lugs. Arc chutes are arranged at the inner concave parts of the outer ends of the outer side surfaces of the two locking lugs. The inner concave parts of the two inner side surfaces separated from the ears are provided with arc bulges. The two arc-shaped bulges which are separated from the lugs are respectively clamped into the arc-shaped sliding grooves corresponding to the locking lugs and can slide. The two arc chutes are provided with limiting blocks at the same ends of the pedicle screw main body in the circumferential direction. The limiting block can prevent the arc-shaped protrusion from continuing to rotate.

Preferably, the inner ends of the two disengaging lugs and the outer ends of the two locking lugs are integrally formed through fracture connecting parts respectively, and fracture grooves are formed on the outer sides of the fracture connecting parts.

Preferably, the pedicle screw body is matched with a locking screw. The length of the locking lug is greater than the diameter of the connecting rod. The opposite side surfaces of the two locking lugs are in the shape of circular arcs and are in the same cylindrical surface. The inner side surfaces of the two locking lugs and the two disengaging lugs are provided with internal threads on the same thread line. The internal thread matches with the external thread of the locking screw. The locking screw can extrude the connecting rod, and the connecting rod and the pedicle screw body are fixed relatively.

Preferably, the joint between the opposite sides of the two locking lugs and the locking disk forms a circular arc surface for accommodating the connecting rod.

Preferably, the scale marks are arranged in sequence along the length direction of the connecting rod, and the single scale mark is circular and surrounds the connecting rod for one circle.

Preferably, the connecting rod is provided with scale marks matched with the scale lines.

Preferably, one end of the pin is sharp.

The invention has the beneficial effects that:

1. the culvert type tail part of the pedicle screw is designed to be composed of the locking part and the disengaging part, so that the tail part of the pedicle screw is prolonged by a plurality of times compared with the U-shaped part used for arranging the connecting rod by the conventional pedicle screw, and compared with the U-shaped long tail design, the culvert type long tail design ensures that the connecting rod is arranged more accurately and only needs to be separated once, and is also convenient for an operator to arrange, reset, lock and break off the disengaging part under direct vision.

2. In the invention, as the screw connecting part of the pedicle screw and the middle of the culvert-shaped tail part are provided with the hollow hole, an operator can determine the position of the channel by placing the positioning pin under the perspective guidance of a C-arm X-ray machine, then the positioning pin is used as an inner core to guide the placement of the pedicle screw, and then the connecting rod is placed to achieve the purposes of resetting and fixing, so that the pedicle screw has the advantages of convenient and safe operation and placement: the complicated steps of pulling out the positioning pin, detecting the channel again, searching the channel inlet and the like are reduced, the injury is small, the number of times of perspective in the operation is small, medical care personnel are protected and the like, so that a beginner or a spinal surgeon with insufficient experience can operate more simply, conveniently and safely in the screw inserting process, and the learning curve of the low-age-funded spinal surgeon is shortened.

3. According to the connecting rod with the scale lines, the distance between the upper pedicle screw and the lower pedicle screw can be evaluated more visually and accurately according to the accurate medical concept, so that data support is provided for the subsequent operations of pressurization, distraction and the like of a spine surgeon, the damage and the perspective times in the operation are reduced, the operation time is shortened, and the operations of pressurization, distraction and the like are safer.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

FIG. 2 is a perspective view of the combination of the pedicle screw body and the pin in embodiment 1 of the invention;

FIG. 3 is a sectional view of the combination of the main body of the pedicle screw and the pin in the embodiment 1 of the invention;

fig. 4 is a schematic view of the screw-connection between the disengagement portion and the locking portion in embodiment 1 of the present invention (a partially enlarged view of a portion a in fig. 3);

FIG. 5 is a schematic view showing the main body of the pedicle screw in the process of separating the detachment part from the locking part in embodiment 1 of the invention;

FIG. 6 is a schematic view of embodiment 1 of the present invention after being mounted on a human body (with the detaching portion removed);

fig. 7 is a schematic view of the overall structure of embodiment 2 of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Example 1

As shown in figure 1, the pedicle screw rod internal fixing device with the positioning pin as the inner core comprises a connecting rod 1, two pedicle screw bodies 2, two locking screws 3 and two pins 4. When in use, the two pedicle screw bodies 2 are arranged on the connecting rod 1 at intervals and are fixed with the connecting rod 1 through the corresponding locking screws 3 respectively. The connecting rod 1 is cylindrical; the side surface of the connecting rod 1 is sequentially provided with a circular scale line 1-1 along the length direction, and is provided with scale marks, so that a doctor can conveniently and quickly read the distance between the two pedicle screw bodies 2. One end of the pin 4 is sharp and can be pre-punctured into the part of the patient needing to be implanted with the pedicle screw, so as to provide positioning for the pedicle screw main body 2.

As shown in fig. 2, 3, 4 and 5, the pedicle screw body 2 includes a detachment portion 5, a locking portion 6 and a screw portion 7. The locking portion 6 is composed of an integrally formed locking disk 6-1 and two locking lugs 6-2. The two locking lugs 6-2 are respectively connected with the edges of the two sides of the outer side surface of the locking disc 6-1. The length of the locking lug 6-2 is greater than the diameter of the connecting rod 1. The opposite sides of the two locking lugs 6-2 are circular arc-shaped and are in the same cylindrical surface. The joints of the opposite side surfaces of the two locking lugs 6-2 and the locking disc 6-1 are arc-shaped, and form an arc surface 6-3 for accommodating the connecting rod 1. The radius of the circular arc surface is equal to the radius of the connecting rod 1. So that the connecting rod 1 can be stably arranged between the two locking lugs 6-2 without shaking.

The screw portion 7 is coaxially provided on the inner side surface of the locking disk 6-1. The outer end of the screw portion 7 is sharp. The main body 2 of the pedicle screw is provided with a central hole which penetrates through a screw part 7 and a locking disc 6-1 and is used for matching with the pin 4. The diameter of the central hole of the pedicle screw body 2 is larger than or equal to the diameter of the pin 4.

The disengaging part 5 is arranged at the outer side of the locking part 6 and consists of an integrally formed outer fixing ring 5-1 and two disengaging lugs 5-2. The inner ends of the two disengaging lugs 5-2 are respectively screwed with the outer ends of the two locking lugs 6-2, and the screw part 7 has a limit position in the rotating direction of screwing into the bone. By rotating the disengaging portion 5 in the reverse direction, the disengaging portion 5 can be separated from the locking portion 6. The inner side surfaces of the two locking lugs 6-2 and the two disengaging lugs 5-2 are provided with internal threads on the same thread line. Which matches the external thread of the locking screw 3.

As an optional specific implementation manner of the invention: as shown in fig. 4 and 5, the outer end screwing part of the outer side surfaces of the two locking lugs 6-2 is arranged inwards; the inner end rotary connection parts of the inner side surfaces of the two separation lugs 5-2 are arranged in a concave manner, so that the inner side surfaces and the outer side surfaces can be kept flush when the locking lugs 6-2 are in rotary connection with the separation lugs 5-2. The outer end concave parts of the outer side surfaces of the two locking lugs 6-2 are both provided with arc chutes 6-4. The inner concave parts of the inner side surfaces of the two separation lugs 5-2 are both provided with arc-shaped bulges 5-3. The arc-shaped bulges 5-3 of the two disengaging lugs 5-2 are respectively clamped in the arc-shaped sliding grooves 6-4 of the corresponding locking lugs 6-2 and can slide. The two arc chutes 6-4 are provided with limiting blocks 6-5 at the same end of the pedicle screw main body 2 in the circumferential direction. The limiting block 6-5 can prevent the arc-shaped protrusion 5-3 from continuing to rotate. In the circumferential direction of the pedicle screw main body 2, the limiting block 6-5 is positioned at one side of the screwing direction (i.e. the screwing direction of the attacking bone) of the screw part 7 of the arc chute 6-4.

The using process of the invention is as follows:

firstly, a doctor taps two pilot channels for positioning the positioning pins at two positions where the pedicle screws need to be implanted.

Step two, the two pedicle screw main bodies 2 are sleeved at the tail ends of the two pins 4 with the screw parts 7 facing inwards; rotating the pedicle screw body 2 by using an electric tool so that the pedicle screw body 2 taps into the target position along the direction of the pin 4; the separation part 5 of the pedicle screw body 2 can prop open human tissues during the implantation process, so as to provide a visual field and an operation space for a doctor.

After the pedicle screw main bodies 2 are in place, the pins 4 are pulled out, and the connecting rods 1 are respectively inserted between the two separation lugs 5-2 of the two pedicle screw main bodies 2; the connecting rod 1 is then fed inwardly between the two locking lugs 6-2.

And step four, accurately adjusting the distance between the two pedicle screw bodies 2 to a required value by using the scale line 1-1 and scale representation on the connecting rod 1.

Fifthly, respectively screwing locking screws 3 into the outer ends of the two pedicle screw bodies 2; locking screw 3 extrudes connective bar 1, realizes the fixed of connective bar 1 and two pedicle of vertebral arch nail main parts 2.

Sixthly, as shown in fig. 5 and 6, rotating the detachment part 5 of the pedicle screw body 2 in the direction opposite to the screwing direction of the pedicle screw body 2 to complete the detachment of the detachment part 5 from the locking part 6.

Example 2

As shown in fig. 7, the present embodiment is different from embodiment 1 in that: the detachment part 5 of the pedicle screw body 2 is not connected with the locking part 6 in a screwing manner. The disengaging part 5 is arranged at the outer side of the locking part 6 and consists of an integrally formed outer fixing ring 5-1 and two disengaging lugs 5-2. The inner ends of the two separation lugs 5-2 and the outer ends of the two locking lugs 6-2 are respectively integrally formed through the fracture connecting part 2-1. A breaking groove is formed in the outer side of the breaking mark connecting part 2-1; the doctor can break the connection between the disengaging part 5 and the locking part 6 by pressing from the outside.

Claims

1. A pedicle screw rod internal fixing device taking a positioning pin as an inner core comprises a connecting rod (1) and a pedicle screw main body (2); the method is characterized in that: also comprises a pin (4); the connecting rod (1) is cylindrical; scale marks (1-1) are arranged on the side surface of the connecting rod (1); the pedicle screw main body (2) comprises a separation part (5), a locking part (6) and a screw part (7) which are sequentially connected; the locking part (6) comprises a locking disc (6-1) and two locking lugs (6-2); the two locking lugs (6-2) are respectively connected with the edges of the two sides of the locking disc (6-1); the joint of the opposite side surfaces of the two locking lugs (6-2) and the locking disc (6-1) forms a circular arc surface (6-3) for placing the connecting rod (1); after being mounted on a human body, the connecting rod (1) is positioned between the two locking lugs (6-2); the locking part (6) can be fixed and separated from different positions of the connecting rod (1); the outer end part of the screw part (7) is sharp; the pedicle screw main body (2) is provided with a center hole which penetrates through a screw part (7) and the locking disc (6-1) and is used for being matched with the pin (4); the disengaging portion (5) is separable from the locking portion (6).

2. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 1, wherein: the separation part (5) comprises an outer fixing ring (5-1) and two separation lugs (5-2); the two disengaging lugs (5-2) are respectively detachably connected with the two locking lugs (6-2).

3. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 2, wherein: the inner ends of the two disengaging lugs (5-2) are respectively screwed with the outer ends of the two locking lugs (6-2), and a limit position is arranged in the rotating direction of the screw part (7) screwed into the skeleton.

4. A pedicle screw rod internal fixation device with a locating pin as an inner core as claimed in claim 3, wherein: the outer end rotary joint parts of the outer side surfaces of the two locking lugs (6-2) are arranged inwards; the inner end rotary connection parts of the inner side surfaces of the two separation lugs (5-2) are arranged in a concave manner, so that the inner side surfaces and the outer side surfaces can be kept flush when the locking lugs (6-2) are in rotary connection with the separation lugs (5-2).

5. A pedicle screw rod internal fixation device with a positioning pin as an inner core according to claim 4, wherein: arc chutes (6-4) are respectively arranged at the inner concave parts of the outer ends of the outer side surfaces of the two locking lugs (6-2); the inner concave parts of the inner side surfaces of the two separation lugs (5-2) are respectively provided with an arc-shaped bulge (5-3); the arc-shaped bulges (5-3) of the two disengaging lugs (5-2) are respectively clamped into the arc-shaped sliding grooves (6-4) of the corresponding locking lugs (6-2) and can slide; the two arc chutes (6-4) are provided with limiting blocks (6-5) at the same end of the pedicle screw main body (2) in the circumferential direction; the limiting block (6-5) can prevent the arc-shaped protrusion (5-3) from continuing to rotate.

6. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 2, wherein: the inner ends of the two separation lugs (5-2) and the outer ends of the two locking lugs (6-2) are respectively integrally formed through the fracture connecting part (2-1); the outer side of the fracture connecting part (2-1) is provided with a fracture groove.

7. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 2, wherein: the pedicle screw body (2) is matched with a locking screw (3); the length of the locking lug (6-2) is larger than the diameter of the connecting rod (1); the opposite side surfaces of the two locking lugs (6-2) are arc-shaped and are in the same cylindrical surface; the inner side surfaces of the two locking lugs (6-2) and the two disengaging lugs (5-2) are provided with internal threads on the same thread line; the internal thread is matched with the external thread of the locking screw (3); the locking screw (3) can extrude the connecting rod (1) to realize the relative fixation of the connecting rod (1) and the pedicle screw main body (2).

8. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 1, wherein: the scale marks (1-1) are sequentially arranged along the length direction of the connecting rod (1), and a single scale mark is circular and surrounds the connecting rod (1) for a circle.

9. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 1, wherein: the connecting rod (1) is provided with scale marks matched with the scale marks (1-1).

10. A pedicle screw rod internal fixation device with a locating tip as an inner core as claimed in claim 1, wherein: one end of the pin (4) is sharp.