Lumbar facet fusion screw fixation positioner and method of use thereof

Abstract

The invention discloses a lumbar vertebral facet fusion screw fixing positioner and a method of using the same, comprising: a positioner body, a positioning guide pin, a sighting sleeve and a sighting guide pin; the positioner body comprises a longitudinal connecting rod, a positioning guide pin connecting rod, a transverse connecting rod, a sighting sleeve bracket and a locking screw; the longitudinal connecting rod is movably connected with the transverse connecting rod and together forms a parallelogram structure; the sighting sleeve bracket is fixed to the lower end of the longitudinal connecting rod; the sighting sleeve is installed on the sighting sleeve bracket; the sighting sleeve is used to insert the sighting guide pin; the positioning guide pin connecting rod is movably connected with the transverse connecting rod; the positioning guide pin is installed in the positioning guide pin connecting rod; the end of the positioning guide pin connecting rod is provided with a fastening screw for fixing the positioning guide pin; the middle section of the needle body of the positioning guide pin is provided with a limit buckle. The invention has a simple structure, can accurately realize the screw implantation of minimally invasive surgery for intervertebral disc / space fusion, improves the operation efficiency, reduces the operation risk, avoids the damage to the nerves and blood vessels, and improves the intervertebral fusion effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to a lumbar facet fusion screw fixation positioner; in addition, the present invention also relates to a method for using the lumbar facet fusion screw fixation positioner. Background Art

[0002] Lumbar degenerative diseases such as lumbar disc herniation, lumbar instability, and lumbar spondylolisthesis account for a considerable proportion of current orthopedic outpatient clinics. Such diseases can cause patients persistent pain, inability to engage in physical labor, and other distress, seriously affecting their quality of life. This type of disease is currently treated clinically by intervertebral joint screw implantation and fusion. During this operation, the implantation and fixation of the screws in the intervertebral joint are the key to the entire operation. The current mainstream surgical method is percutaneous operation assisted by imaging. This surgical method has the advantages of small incisions, less tissue stripping, less bleeding, and fast recovery. However, how to quickly find the screw implantation point and implantation angle during screw implantation currently depends mainly on the surgeon's experience and repeated adjustments during the operation, which poses a considerable challenge to the doctor's professional experience and techniques. It also carries very high risks.

[0003] In order to assist the surgeon in finding the best path for screw implantation during surgery, Zeng Zhongyou invented a "lumbar vertebral lamina articular process screw aiming device" (patent number: ZL200920120264.5). Based on the principle of two points in a straight line, the device positioning rod and guide sleeve are adjusted by accurately measuring the lateral inclination angle of the lamina, the distance from the surface of the transverse process to the central axis of the lamina and the intersection of the transverse process, and the distance from the deep surface of the spinous process base to the central axis of the lamina and the intersection of the spinous process base, so as to determine the entry and exit points and implant the screws. The problem with this solution is that it requires more external measurement data, and the entry point also depends on the doctor's experience and intraoperative adjustment, which is prone to errors. The utility model patent of the University of South China, "Bilateral Positioning Pedicle Screw Aiming Device" (patent number ZL: 201621234335.0), uses a personalized body and guide sleeve based on the patient's detailed vertebral imaging data combined with auxiliary software algorithms to help doctors provide each patient with a "personalized screw aiming device". This device and method largely ensure the accuracy of the patient's screw placement, but the operation of this solution is relatively complex, with high requirements for software and image modeling, and high costs. Therefore, how to develop a lumbar facet fusion screw fixation and positioning device that can achieve accurate screw implantation in minimally invasive surgery to improve the doctor's surgical efficiency, reduce surgical risks and doctor experience thresholds, reduce production costs, and simplify the operation process is a direction that technicians in this field need to study. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lumbar facet fusion screw fixation positioner, which can realize accurate screw implantation in minimally invasive surgery, improve surgical efficiency, reduce surgical risks and doctor experience threshold, reduce production costs, and simplify the operation process. To this end, the present invention also provides a method for using the lumbar facet fusion screw fixation positioner.

[0005] In order to solve the above technical problems, the technical solutions adopted are as follows:

[0006] A lumbar vertebral articular process fusion screw fixation positioner, comprising: a positioner body, a positioning guide pin, a sighting device sleeve and a sighting guide pin; the positioner body comprises two longitudinal connecting rods, two positioning guide pin connecting rods, two transverse connecting rods, a sighting device sleeve bracket and a locking screw; the longitudinal connecting rod and the positioning guide pin connecting rod are arranged longitudinally; the transverse connecting rod and the sighting device sleeve bracket are arranged transversely; each of the longitudinal connecting rods is movably connected to each transverse connecting rod by a movable screw, and the two longitudinal connecting rods and the two transverse connecting rods together form a parallelogram structure; the sighting device sleeve bracket The frame is fixed to the lower ends of the two longitudinal connecting rods by movable screws; the sight sleeve is installed on the sight sleeve bracket; the sight sleeve is used to insert the aiming guide needle; an oblique connecting rod is also provided between the longitudinal connecting rods, and the locking screw is connected to the oblique connecting rod and is used to lock / loosen the oblique connecting rod; the positioning guide needle connecting rod is movably connected to the two transverse connecting rods respectively; the positioning guide needle connecting rod is a hollow structure and is used to install the positioning guide needle; the end of the positioning guide needle connecting rod is provided with a fastening screw for fixing the positioning guide needle; the middle section of the needle body of the positioning guide needle is provided with a limit buckle.

[0007] By adopting this technical solution: the locator body is composed of a "three horizontal and four vertical" plane structure consisting of a longitudinal connecting rod, a positioning guide needle connecting rod, a transverse connecting rod and a sight sleeve bracket. When the locator locking screw is not locked, the connecting rod can be adjusted around the movable screw to form a parallelogram with constantly changing angles. When the locator locking screw is not locked, the entire locator can be squeezed and stretched in the plane to form a parallelogram of different angles, which can provide a full range of aiming angle switching for the sight. After the angle adjustment is completed, only one locking screw needs to be tightened, and the entire locator cannot be relatively displaced, providing a fixed angle for the implantation of fusion needles and screws.

[0008] Preferably, in the above-mentioned lumbar facet fusion screw fixation positioner: the needle head of the positioning guide needle is provided with a fastening thread.

[0009] By adopting this technical solution: when the positioning guide needle is implanted, the structure of the needle head fastening thread can help the positioning guide needle head to be more easily implanted into the spinal surface, and during the subsequent locator adjustment and fusion needle positioning implantation operations, the position can be kept fixed, thereby improving the positioning accuracy of the fusion needle.

[0010] More preferably, in the above-mentioned lumbar facet fusion screw fixation positioner: the transverse connecting rod is provided with a sliding groove, and the positioning guide needle connecting rod is provided with a limiting screw passing through the sliding groove.

[0011] By adopting this technical solution: when the limit screw is loosened, the positioning guide needle can slide left and right in the sliding groove. The positioner can be suitable for patients with different intervertebral lengths, widths, and gaps. By adjusting the position of the movable positioning guide needle connecting rod, the fusion needle positioning and aiming of screw implantation can be provided for patients with different physiological characteristics.

[0012] Further preferably, in the above-mentioned lumbar facet fusion screw fixation positioner: a plurality of groups of mounting holes are provided on the rod body of the longitudinal connecting rod, and the sizes of the mounting holes correspond to the movable screws.

[0013] By adopting this technical solution: the locator cross-link can be installed in different mounting holes, and with positioning guide needles of different lengths and sizes, the locator can be applied to patients with different thicknesses of subcutaneous fat, muscle and tissue. For obese patients with thick subcutaneous fat, it is only necessary to install the second locator cross-link in the mounting hole at the upper part and select a matching longer positioning guide needle.

[0014] Based on the above device, the present invention also discloses a method for using a lumbar vertebral facet fusion screw fixation positioner, which comprises the following steps:

[0015] S1: Locate the center point of the spinous process, insert a positioning guide needle into the center point of the spinous process, and fix the positioning guide needle at the center point of the spinous process using the fastening thread on the head of the positioning guide needle;

[0016] S2: locate the center point of the inferior articular process and insert another positioning guide needle vertically percutaneously;

[0017] S3: adjusting the position of the movable positioning guide needle connecting rod in the positioning guide needle connecting rod sliding groove until the distance between the two positioning guide needle connecting rods is equal to the distance between the two positioning guide needles;

[0018] S4: Insert the two positioning guide needle connecting rods on the positioner body from the upper part of the two positioning guide needles;

[0019] S5: squeeze / stretch the positioner body, adjust the angles of the parallelograms in the positioner body, until the bottoms of the two positioning guide needle connecting rods respectively abut against the limit buckles of the two positioning guide needles;

[0020] S6: Tighten the fastening screw at the bottom of the positioning guide needle connecting rod to make the positioner body and the two positioning guide needles form a whole with a fixed relative position;

[0021] S7: Adjust the positioner body to a position that is convenient for subsequent surgical operations, adjust the locking screw, and lock the positioner body;

[0022] S8: Insert the aiming sleeve 3 into the aiming sleeve bracket, place the aiming sleeve head against the patient's skin, insert the aiming guide needle from the aiming sleeve, and insert it percutaneously into the patient's body.

[0023] Compared with the prior art, the present invention has a simple structure, is easy to operate, and has a low reliance on the doctor's experience and technique. Based on minimally invasive surgery, it can assist the surgeon to quickly, accurately, and safely insert the fixing screw, accurately pass it from the base of the spinous process to the inferior articular process of the opposite side and then to the superior articular process of the inferior vertebra, and achieve a good biomechanical effect. It improves surgical efficiency, reduces surgical risks, avoids damage to peripheral nerves and blood vessels, and improves the intervertebral fusion effect. The present invention has a simple structure, low manufacturing cost, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0025] Figure 1 It is a structural schematic diagram of Example 1;

[0026] Figure 2 It is a schematic diagram of the principle that the top ends of the two positioning guide needles of the positioning device of the present invention and the aiming guide needle at this time are located on the same straight line;

[0027] The corresponding relationship between the reference numerals and component names is as follows:

[0028] 1. Locator body; 2. Positioning guide pin; 3. Sighting sleeve; 4. Aiming guide pin;

[0029] 11. Longitudinal connecting rod; 12. Positioning guide pin connecting rod; 13. Horizontal connecting rod; 14. Sighting device sleeve bracket; 15. First movable screw; 16. Locking screw; 17. Second movable screw; 21. Limit buckle; 22. Fastening thread; 131. Sliding groove; 122. Limit screw; 111. Mounting hole; 121. Fastening screw; 161. Oblique connecting rod. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solution of the present invention, further description will be given below in conjunction with various embodiments.

[0031] like Figure 1 Shown is embodiment 1 of the present invention:

[0032] A lumbar vertebral articular process fusion screw fixation positioner comprises: a positioner body 1, a positioning guide pin 2, a sighting device sleeve 3 and a sighting guide pin 4.

[0033] Among them, the locator body 1 includes two longitudinal connecting rods 11, two positioning guide needle connecting rods 12, two transverse connecting rods 13, a sighting sleeve bracket 14 and a locking screw 16; the longitudinal connecting rods 11 and the positioning guide needle connecting rod 12 are arranged in the longitudinal direction; the transverse connecting rod 13 and the sighting sleeve bracket 14 are arranged in the transverse direction; each of the longitudinal connecting rods 11 is movably connected with each transverse connecting rod 13 through a plurality of first movable screws 15, and the two longitudinal connecting rods 11 and the two transverse connecting rods 13 intersect to form a parallelogram structure; the sighting sleeve bracket 14 is fixed to the lower ends of the two longitudinal connecting rods 11 through two second movable screws 17; the sighting sleeve 3 is installed on the sighting sleeve bracket 14, and the sighting sleeve 3 is connected to one end of the sighting sleeve bracket 14; the sighting sleeve 3 is used to insert the aiming guide needle 4; an oblique connecting rod 161 is also provided between the longitudinal connecting rods 11, and the locking screw 16 Connecting the oblique connecting rod 161, used for locking / loosening the oblique connecting rod 161; the two positioning guide needle connecting rods 12 are movably connected with the two transverse connecting rods 13 respectively; the two positioning guide needle connecting rods 12 intersect with the two transverse connecting rods 13 to form a parallelogram structure; the positioning guide needle connecting rod 12 is a hollow structure, used for installing the positioning guide needle 2; the end of the positioning guide needle connecting rod 12 is provided with a fastening screw 121 for fixing the positioning guide needle 2; the middle section of the needle body of the positioning guide needle 2 is provided with a limit buckle 21.

[0034] The needle head of the positioning guide needle 2 is provided with a fastening thread 22. The fastening thread 22 is used to fix the positioning needle head at the center of the spinous process point.

[0035] In this example, the horizontal connecting rod 13 is provided with a sliding groove 131, and the positioning guide needle connecting rod 12 is provided with a limit screw 122 passing through the sliding groove 131. The positioning guide needle connecting rod 12 can slide in the sliding groove 131. A plurality of mounting holes 111 are provided at the intersection of the rod body of the longitudinal connecting rod 11 and the horizontal connecting rod 13, and the size of the mounting holes 111 corresponds to the first movable screw 15.

[0036] In practice, the working process is as follows:

[0037] S1: The doctor first locates the center point of the spinous process with the assistance of C-arm X-ray images, inserts a positioning guide needle 2, and fixes the positioning guide needle 2 at the center point of the spinous process using the fastening thread 22 on its head;

[0038] S2: The center of the inferior articular process is located with the assistance of C-arm X-ray imaging, and another positioning guide needle 2 is inserted vertically percutaneously;

[0039] S3: adjusting the position of the movable positioning guide needle connecting rod 12 in the positioning guide needle 2 connecting rod sliding groove 131 until the distance between the two positioning guide needle connecting rods 12 is equal to the distance between the two positioning guide needles 2;

[0040] S4: insert the two positioning guide needle connecting rods 12 on the positioner body 1 from the upper part of the two positioning guide needles 2;

[0041] S5: squeeze / stretch the locator body 1, and adjust the angles of the parallelograms in the locator body 1 until the bottoms of the two positioning guide needle connecting rods 12 respectively abut against the limit buckles 21 of the two positioning guide needles 2;

[0042] S6: Tighten the fastening screw 121 at the bottom of the positioning guide needle connecting rod 12, so that the positioner body 1 and the two positioning guide needles 2 form a whole with a fixed relative position;

[0043] S7: Adjust the positioner body 1 to a position that is convenient for subsequent surgical operations, adjust the locking screw 16, and lock the positioner body 1;

[0044] S8: Insert the aiming sleeve 3 into the aiming sleeve bracket 14, with the head of the aiming sleeve 3 against the patient's skin, insert the aiming guide needle 4 from the aiming sleeve 3, and insert it percutaneously into the patient's body.

[0045] like Figure 2 As shown, the lumbar vertebral facet fusion screw fixation positioner body of the present invention has been strictly limited to the "three horizontal and four vertical" plane structure when it is designed and manufactured. The horizontal bars are parallel to each other, the vertical bars are also parallel to each other, and the length of each connecting rod is also strictly limited. Figure 2 As shown, AB is parallel and equal to CD (strictly restricted during design and manufacture), so ACDB is a parallelogram, and BD is parallel to AC. AB is parallel and equal to EF (strictly restricted during design and manufacture), so AEFB is a parallelogram, and BF is parallel to AC (AC and AE are on the same straight line). AB is parallel and equal to GH (strictly restricted during design and manufacture), so AGHB is a parallelogram, and BH is parallel to AC (AC and AG are on the same straight line). It can be seen that BD, BF, and BH are all parallel to AC. In a plane, there is only one straight line parallel to another straight line through a point, so B, D, F, and H are on the same straight line, that is, the top of the two positioning guide needle heads and the aiming guide needle at this time are on the same straight line.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be subject to the scope of the claims.

Claims

1. A lumbar vertebral facet fusion screw fixation positioner, characterized in that: include: A locator body (1), a locating guide pin (2), a sighting sleeve (3) and a sighting guide pin (4); The positioner body (1) comprises two longitudinal connecting rods (11), two positioning guide needle connecting rods (12), two transverse connecting rods (13), a sighting sleeve bracket (14) and a locking screw (16); the longitudinal connecting rods (11) and the positioning guide needle connecting rods (12) are arranged in the longitudinal direction; the transverse connecting rods (13) and the sighting sleeve bracket (14) are arranged in the transverse direction; each of the longitudinal connecting rods (11) is movably connected to each transverse connecting rod (13) via a movable screw (15), and the two longitudinal connecting rods (11) and the two transverse connecting rods (13) are movably connected to each other via a movable screw (15). The transverse connecting rods (13) together form a parallelogram structure; the sight sleeve bracket (14) is respectively fixed to the lower ends of the two longitudinal connecting rods (11) through movable screws (15); the sight sleeve (3) is installed on the sight sleeve bracket (14); the sight sleeve (3) is used to insert the aiming guide needle (4); an oblique connecting rod (161) is also provided between the longitudinal connecting rods (11), and the locking screw (16) is connected to the oblique connecting rod (161) and is used to lock / loosen the oblique connecting rod (161); The positioning guide needle connecting rod (12) is movably connected to the two transverse connecting rods (13) respectively; the positioning guide needle connecting rod (12) is a hollow structure and is used to install the positioning guide needle (2); the end of the positioning guide needle connecting rod (12) is provided with a fastening screw (121) for fixing the positioning guide needle (2); the middle section of the needle body of the positioning guide needle (2) is provided with a limit buckle (21); The needle head of the positioning guide needle (2) is provided with a fastening thread (22); A plurality of groups of mounting holes (111) are provided on the rod body of the longitudinal connecting rod (11), and the sizes of the mounting holes (111) correspond to the movable screws (15).

2. The lumbar vertebral facet fusion screw fixation positioner according to claim 1, characterized in that: The transverse connecting rod (13) is provided with a sliding groove (131), and the positioning guide needle connecting rod (12) is provided with a limiting screw (122) passing through the sliding groove (131).

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