Distraction device for thoracolumbar posterior surgery

Abstract

The utility model relates to a distractor for thoracolumbar posterior surgery, which comprises a parallel distracting forceps body and two distracting forceps heads connected with the parallel distracting forceps body, and each distracting forceps head is composed of a leading-in end and a distracting arm. The parallel opening forceps body comprises two forceps handles which are hinged with each other and two push rods which are hinged with each other in a crossed manner; the upper parts of the forceps handles are respectively hinged with distraction arms for distraction of the forceps heads, and each distraction arm is also provided with a chute; one end of the push rod is in sliding fit with the sliding groove of one distraction arm, and the other end of the push rod is hinged to the other distraction arm. A reed is arranged between the two forceps handles, and a limiting regulator for controlling the opening forceps head to move is further arranged between the two forceps handles. The intervertebral space distraction device has the advantages that the intervertebral space distraction device is simple in structure, convenient and fast to operate and capable of effectively distraction intervertebral space, provides a good and wide operation space for intervertebral space operation, and improves accuracy and safety during intervertebral disc resection and fusion cage implantation.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a distractor used for posterior thoracic and lumbar spine surgery. Background Art

[0002] Nowadays, the incidence of degenerative thoracolumbar diseases such as herniated disc and spinal stenosis is increasing. PLIF and TLIF are the main surgical methods for treating these degenerative thoracolumbar diseases. The specific method is to implant pedicle screws during the operation, and then use molds, cut rods, bend rods, and install rods to expand the intervertebral space. Lumbar interbody fusion is one of the methods for treating spinal diseases. Every year, more and more people receive interbody fusion treatment.

[0003] Currently, after the rod is fixed, the connecting rod is above the intervertebral space. When the intervertebral fusion device is implanted, the position of the rod results in insufficient operating space when the device is implanted, which greatly hinders the implantation of the intervertebral fusion device and increases the risk of accidental nerve injury, especially for the implantation of kidney-shaped fusion devices. If the rod is not pre-installed to expand the intervertebral space, the intervertebral space cannot be effectively expanded, resulting in a smaller implanted fusion device, the height of the intervertebral space cannot be effectively restored, and the postoperative symptom relief is unsatisfactory.

[0004] In addition, existing posterior lumbar distractors generally use arc-plate sleeves with symmetrical ends to support the lumbar spine with the arc surface, but the operating space is small, which affects the operation of other instruments. In addition, it is inconvenient to carry, which increases the workload of users and affects the efficiency of medical surgery.

[0005] Therefore, in summary, there is an urgent need for a dilator for posterior thoracic and lumbar spine surgery that can solve the compatibility between the intervertebral fusion device and the upper and lower vertebrae, effectively open the intervertebral space, provide a good and wide operating space for intervertebral space surgery, and improve the safety and effectiveness of the surgery. Summary of the invention

[0006] The purpose of the utility model is to solve the above problems. To this end, a distractor for posterior thoracic and lumbar spine surgery is provided.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A dilator for posterior thoracolumbar surgery, comprising a parallel dilating pliers body and two dilating pliers heads connected to the parallel dilating pliers body, wherein the dilating pliers heads are composed of an introduction end and a dilating arm, and the introduction end is located at the front end of the dilating arm; correspondingly, the parallel dilating pliers body comprises two mutually hinged pliers handles and two mutually cross-hinged push rods; wherein the upper part of the pliers handle is respectively hingedly connected to the dilating arms of the dilating pliers heads, and a slide groove is also provided on each of the dilating arms;

[0009] Correspondingly, one end of the push rod is slidably matched with the sliding groove of one of the spreading arms, and the other end is hinged to the other spreading arm; a spring is arranged between the two clamp handles, and a limit adjuster for controlling the movement of the spreading clamp head is also arranged between the two clamp handles.

[0010] The expander for posterior thoracic and lumbar spine surgery provided by the utility model may also have the following technical features: the cross-sectional shape of the introduction end is a flat rectangle, and a notch is provided at its head end; correspondingly, a circular chamfer is provided at the connection between the expansion arm and the introduction end, and the introduction end portion and the expansion arm have a smooth transition.

[0011] The expander for posterior thoracic and lumbar spine surgery provided by the utility model may also have the following technical features: the expander arm is integrally connected to the introduction end, and the connection between the expander arm and the introduction end is arranged to be inclined; and the introduction end is arranged in an "H"-shaped structure as a whole.

[0012] The distractor for posterior thoracic and lumbar spine surgery provided by the utility model may also have the following technical features: the clamp handles are provided with grooves for placing the limit adjusters; a rotating shaft is provided in the groove of one of the clamp bodies; one end of the limit adjuster is rotatably connected to the rotating shaft in the groove; and teeth are also provided on the limit adjuster;

[0013] Correspondingly, a groove of the other clamp handle is provided with limit groove teeth corresponding to the teeth on the limit adjuster; and the limit groove teeth move in coordination with the teeth on the limit adjuster.

[0014] The distractor for posterior thoracic and lumbar spine surgery provided by the utility model may also have the following technical features: hand-held grooves for auxiliary grasping are arranged on both sides of the clamp body, and the hand-held grooves are designed in accordance with ergonomics.

[0015] The utility model has the advantages that:

[0016] 1. The utility model has a simple structure and is easy to operate. It can effectively open the intervertebral space, provide a good and wide operating space for intervertebral space surgery, and increase the accuracy and safety of disc removal and fusion device implantation. At the same time, good opening stability avoids interference and damage to the spinal cord and nerve roots caused by frequent slippage of conventional openers, thereby improving the safety of surgery.

[0017] 2. The setting of the limit adjuster in the utility model can accurately adjust the spreading distance of the two spreading arms, improve the convenience of the operator's surgical operation, and ensure the effectiveness of the operation. It can greatly improve the convenience of the operator's surgical operation and ensure the safety and effectiveness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] AttachedFigure 1 It is a schematic structural diagram of a distractor for posterior thoracic and lumbar spine surgery according to an embodiment of the utility model.

[0019] Attached Figure 2 It is a structural schematic diagram of the clamp head and the push rod in the embodiment of the utility model.

[0020] Attached Figure 3 It is a result schematic diagram of the clamp head in the embodiment of the utility model.

[0021] Attached Figure 4 It is a structural schematic diagram of the clamp handle and the limit adjustment rod in the embodiment of the utility model.

[0022] Attached Figure 5 It is a schematic diagram of the use state in an embodiment of the utility model.

[0023] Attached Figure 6 It is a real product picture in the embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the contents recorded in the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0025] The reference numerals and components involved in the drawings are as follows:

[0026] 1. Open the pliers body in parallel;

[0027] 11. Pliers handle;

[0028] 12. Putting;

[0029] 13. Reed;

[0030] 14. Turn the anchor;

[0031] 15. Limit adjuster;

[0032] 16. Handheld slot;

[0033] 17. Groove;

[0034] 18. Rotation axis;

[0035] 19. Teeth;

[0036] 191, limit groove teeth;

[0037] 2. Open the pliers head;

[0038] 21. Import terminal;

[0039] 22. Stretch your arms;

[0040] 23. Notch;

[0041] 24. Chute;

[0042] Example

[0043] Please attend the attached Figure 1-5 As shown; attached Figure 1 Schematic diagram of the structure of the expander for posterior thoracic and lumbar spine surgery in the embodiment of the utility model; Figure 2 Schematic diagram of the structure of the clamp head and the push rod in the embodiment of the utility model; Figure 3 Schematic diagram of the clamp head in the embodiment of the utility model; Figure 4 Schematic diagram of the structure of the clamp handle and the limit adjustment rod in the embodiment of the utility model; Figure 5 Schematic diagram of the use state of the embodiment of the utility model; Figure 5 It is a real product picture in the embodiment of the present utility model.

[0044] This device mainly solves the problem of the fit between the intervertebral fusion device and the upper and lower vertebrae, and prevents the intervertebral fusion device from protruding after surgery due to patient activity or inappropriate size of some intervertebral fusion devices (because once the intervertebral fusion device protrudes after surgery, it will compress the patient's nerves at the corresponding stage, which can easily lead to a secondary operation, thereby refilling the intervertebral fusion device or inserting it to its original position); based on this, the present application mainly relates to a dilator used for posterior thoracic and lumbar surgery to effectively dilate the intervertebral space and provide a good and wide operating space for intervertebral space surgical operations.

[0045] like Figure 1 , Figure 2 , Figure 3 As shown, the device includes a parallel spreading clamp body 1 and two spreading clamp heads 2 connected to the parallel spreading clamp body 1, wherein the spreading clamp head 2 is composed of an introduction end 21 and a spreading arm 22, and the introduction end 21 is located at the front end of the spreading arm 22; and in the embodiment, the spreading arm 22 is connected to the introduction end 21 in an integral manner, and the connection between the spreading arm 22 and the introduction end 21 is set to be inclined, and correspondingly, the inclination angle at the introduction end 21 and the horizontal plane of the spreading arm 22 can be 0-45°, and this design ensures that the clamp head of the spreader can fit tightly with the upper and lower vertebrae regardless of front or rear pressure, maintain the intervertebral height, and prevent sliding. And the introduction end 21 is set in an "H"-shaped structure as a whole, which can facilitate the intervertebral fusion device to fit between the upper and lower vertebrae, thereby promoting the fusion of the upper and lower vertebrae.

[0046] Correspondingly, in order to provide patients with a better user experience, the cross-sectional shape of the introduction end 21 is set to a flat rectangle, and a notch 23 is provided at its head end; correspondingly, a circular chamfer is provided at the connection between the expansion arm 22 and the introduction end 21, and the introduction end portion and the expansion arm have a smooth transition.

[0047] In this embodiment, the parallel spreading pliers body 1 comprises two mutually hinged pliers handles 11 and two mutually cross-hinged push rods 12; wherein the upper part of the pliers handles 11 is respectively hingedly connected to the spreading arms 22 of the pliers head, and a slide groove 24 is also provided on each spreading arm 22;

[0048] Correspondingly, one end of the push rod 12 is slidably matched with the slide groove 24 of one spreading arm 22, and the other end is hinged with the other spreading arm 22; and a spring 13 is arranged between the two clamp handles 11, and a limit regulator 15 for controlling the movement of the clamp head is also arranged between the two clamp handles 11. This setting adopts the traditional rotating anchor 14 to hinge and fix with the clamp handle 11 and the spreading arm 22, so as to realize rotation; correspondingly, by squeezing the clamp handle 11 inward, the push rod 12 and the spreading arm 22 can be driven to move outward respectively; and the moving position can be fixed by controlling the limit regulator 15; at the same time, the teeth on the limit regulator 3 can be matched with the limit groove teeth in the clamp handle groove; thereby completing the spreading operation of the spreader; and the hinged setting between the various components in this device are all existing mature technologies, and are relatively common in current life, so no further elaboration is required here.

[0049] like Figure 4 As shown, hand-grip grooves 16 for assisting gripping are provided on both sides of the parallel-open pliers body 1, and the hand-grip grooves 16 conform to the ergonomic design of human hands, which can improve the user experience of the operator when in use.

[0050] In addition, in the present embodiment, grooves 17 for placing the limit adjusters 15 are provided on the clamp handles 11; a rotating shaft 18 is provided in the groove 17 of one of the clamp handles; and one end of the limit adjuster 15 is rotatably connected to the rotating shaft 18 in the groove; and teeth 19 are also provided on the limit adjuster; correspondingly; a limit groove tooth 191 corresponding to the teeth on the limit adjuster is provided in the groove of the other clamp handle; and the limit groove tooth 191 cooperates with the teeth 19 on the limit adjuster to move. Therefore, when opening, it is only necessary to squeeze the clamp handle 11, and under the cooperation of the spring 13 and the two push rods hinged to each other, the limit adjuster 15 located on the limit tooth groove 17 will slowly move to one side with the squeezing, thereby driving the push rod 12 and the opening clamp head 2 to move slowly outward respectively, effectively opening the intervertebral space, and providing a good and wide operating space for intervertebral space surgery; and under the setting of the limit adjuster 15, the opening distance of the two clamp handles can be accurately adjusted and fixed, thereby improving the success rate and safety of the operation.

[0051] The method of using the utility model is as follows: when using the utility model, the patient takes a prone position after anesthesia, the skin, subcutaneous tissue and muscle layer are routinely cut, the bilateral vertebral plates and the pedicle screw entry points of the surgical segment are exposed, the pedicle screws are routinely implanted, and after the pedicle screws are well positioned in the perspective, the pedicle screws on one side are installed with rods, nuts are installed, and tightened, and then the surgeon holds the pliers handle and inserts the introduction end on the pliers head into the slipped intervertebral space. When introducing, the head side working surface of the spreader arm should correspond to the head side vertebra a (lateral slipped vertebra), and the caudal side working surface should correspond to the caudal side vertebra b (such as Figure 5 As shown in the figure, hold the pliers handle tightly, and the pliers heads will open in parallel under the action of the spreading arms and the push rod. When the intervertebral space is spread to a satisfactory degree, the pliers handle is locked by the limit adjuster.

[0052] It should be noted that: the utility model has a simple structure and is easy to operate, and can effectively open the intervertebral space, providing a good and wide operating space for intervertebral space surgery, and increasing the accuracy and safety of disc removal and fusion device implantation; at the same time, good opening stability avoids interference and damage to the spinal cord and nerve roots caused by frequent slippage of conventional openers, thereby improving the safety of surgery; and the setting of the limit adjuster can accurately adjust the opening distance of the two opening arms, thereby improving the convenience of the operator's surgical operation and ensuring the effectiveness of the surgery; in addition, the clamping device for posterior thoracic and lumbar surgery applied in the present device has been internally produced and used in the current clinic (such as Figure 6 As shown), a very good user experience was achieved.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A distractor for posterior thoracolumbar surgery, characterized in that: Including parallel expansion clamp body and parallel The two opening pliers heads connected to the opening pliers body, wherein the opening pliers head is composed of an introduction end and an opening arm, the introduction end Located at the front end of the spreading arm; Correspondingly, the parallel spreading pliers body comprises two mutually hinged pliers handles and two mutually cross-hinged push rods; wherein, The upper part of the pliers handle is respectively hingedly connected to the opening arms for opening the pliers head, and a slide groove is also arranged on each of the opening arms; Correspondingly, one end of the push rod is slidably matched with the slide groove of one of the spreading arms, and the other end is slidably matched with the slide groove of the other spreading arm. A spring is provided between the two clamp handles, and a control mechanism for opening the clamp head is provided between the two clamp handles. Movable limit adjuster; The cross-sectional shape of the introduction end is a flat rectangle, and a notch is provided at the head end; correspondingly, the expansion arm and the guide The connection of the entry end is provided with a circular chamfer, and the entry end part and the expansion arm have a smooth transition; The spreading arm is connected to the introduction end in one piece, and an inclined position is arranged at the connection between the spreading arm and the introduction end. and the inclination angle is 0-45°, and the introduction end is arranged in an "H"-shaped structure as a whole.

2. The distractor for posterior thoracolumbar surgery according to claim 1, characterized in that: The pliers handle A groove for placing a limit adjuster is provided; a rotating shaft is provided in the groove of one of the pliers bodies; the limit adjuster One end of the joint is rotatably connected to the rotating shaft in the groove; and teeth are also provided on the limit adjuster; Correspondingly, a groove of the other clamp handle is provided with limit groove teeth corresponding to the teeth on the limit adjuster; The limit groove teeth move in coordination with the teeth on the limit adjuster.

3. The distractor for posterior thoracolumbar surgery according to claim 1, characterized in that: The two sides of the pliers body A hand-held slot is also provided on the side to assist in grasping, and the hand-held slot is designed in accordance with ergonomics.

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