Pressing rod reset forceps

Abstract

The utility model provides a pair of press rod reset forceps, which comprises an inner sleeve component, an outer sleeve component and a sliding handle, the inner sleeve component and the outer sleeve component are both of hollow structures, the outer sleeve component is positioned on the outer surface of the inner sleeve component, and the outer sleeve component can slide along the outer surface of the inner sleeve component when the sliding handle is pressed. A pedicle screw assembly is fixedly arranged at the front end of the inner sleeve assembly. The problems that in an existing bone correction operation, when a connecting rod is locked, firstly, the connecting rod is primarily pressed through frog type reduction forceps, then a jackscrew is screwed in, and the connecting rod is locked, but due to the fact that a pedicle screw is screwed into a human body at the moment, the view field is limited, and the connecting rod is locked are solved. The problem that a connecting rod cannot be rapidly and accurately pressed due to the fact that a positioning structure matched with a nail cap in shape is not arranged at the pressing end of the front end of existing frog type reduction forceps, and the nail cap cannot be rapidly positioned is solved. The connecting rod compressing and resetting device can be widely applied to compressing and resetting of the connecting rod in the orthopedic surgery.

Description

Technical Field

[0001] The utility model relates to a medical pressing rod device, in particular to a pressing rod resetting forceps. Background Art

[0002] Pedicle screws and connecting rods are commonly used surgical instruments in orthopedic corrective surgery. They are easy to use, stable in structure, and highly safe, and they play a good guiding role in the patient's postoperative recovery.

[0003] During the operation, the doctor first drives the pedicle screw into the position of the adjacent diseased bone, and then places the connecting rod into the fixing groove on the screw cap. The inner surface of the fixing groove is provided with an internal thread, and then the connecting rod is screwed into the fixing groove through a top screw to lock the connecting rod. However, because the connecting rod needs to be bent according to the correction angle of the diseased bone before being placed, the bent connecting rod is difficult to place at the bottom of the fixing groove. At this time, if it is directly locked and fixed by the top screw, the connecting rod will cause shaking, resulting in an inaccurate correction angle.

[0004] The existing solution is to initially compress the connecting rod with a frog-type reduction forceps, and then screw in the top screw to lock the connecting rod. However, since the pedicle screw has been screwed into the human body at this time, the field of vision is limited, and the front compression end of the existing frog-type reduction forceps is not provided with a positioning structure that matches the shape of the screw cap, and the screw cap cannot be quickly positioned, resulting in the inability to quickly and accurately compress the connecting rod, which prolongs the overall progress of the operation. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a pressure rod reduction pliers, which can quickly position and install the nail cap and can quickly and accurately compress the connecting rod, thus shortening the overall operation time and promoting the patient's recovery after surgery.

[0006] To this end, the technical solution of the utility model is a pressure rod reset pliers, including an inner sleeve assembly, an outer sleeve assembly and a sliding handle. The interiors of the inner sleeve assembly and the outer sleeve assembly are both hollow structures. The outer sleeve assembly is located on the outer surface of the inner sleeve assembly. By pressing the sliding handle, the outer sleeve assembly can slide along the outer surface of the inner sleeve assembly.

[0007] The front end of the inner sleeve assembly is provided with an inner sleeve front end mounting and fixing section, the middle of the inner sleeve assembly is provided with an inner sleeve middle supporting section, and the rear end of the inner sleeve assembly is provided with an inner sleeve rear end limiting section;

[0008] A through hole is provided inside the front end mounting and fixing section of the inner sleeve, and elastic locking pieces are fixedly provided at the top and bottom positions of the front end of the inner sleeve mounting and fixing section respectively, and locking bosses are fixedly provided at the inner end surfaces of the two elastic locking pieces respectively, and a limiting support end surface vertically arranged relative to the inner sleeve assembly is provided at the rear end position of the locking boss, and U-shaped limiting grooves opening to the front end are symmetrically provided at the left and right sides of the front end of the front end mounting and fixing section of the inner sleeve;

[0009] A connecting support boss is fixedly provided at the top position of the middle support section of the inner sleeve, and a first positioning pin hole is provided on the connecting support boss;

[0010] A fixed end face is provided at the top position of the rear end limiting section of the inner sleeve, and a supporting spring sheet is fixedly provided on the fixed end face, and the middle position of the fixed end face and the supporting spring sheet is fixedly connected, and the front end position and the rear end position of the supporting spring sheet are bent upwards respectively, and rack fixing support plates are symmetrically provided at the two sides of the fixed end face, and second positioning pin holes are symmetrically provided on the two rack fixing support plates, and a limiting rack is provided between the two rack fixing support plates, and the limiting rack is vertically arranged upward, and a limiting tooth is provided on the end face of the limiting rack, and a third positioning pin hole is provided through the lower position of the limiting rack, and the third positioning pin hole and the second positioning pin hole are internally fixedly connected with a positioning pin, and the limiting rack and the rack fixing support plate are rotationally fixedly connected by the positioning pin, and the bottom end position of the limiting rack is fixedly connected to the rear end upper surface position of the supporting spring sheet;

[0011] The front end position of the outer sleeve assembly is provided with an outer sleeve front end locking section, the rear end position of the outer sleeve assembly is provided with an outer sleeve rear end supporting section, the front end of the outer sleeve front end locking section is symmetrically provided with locking limit arc grooves opening to the front end at the left and right sides of the front end, and the bottom position of the rear end supporting section of the outer sleeve is provided with a sliding fixed support seat, and the sliding fixed support seat is provided with a penetrating sliding limit pin hole;

[0012] The front end fixing brackets of the sliding handle are symmetrically fixed on the left and right sides of the front end position of the sliding handle, the front end fixing brackets of the two sliding handles are symmetrically provided with fourth positioning pin holes passing through near the top end, and the front end fixing brackets of the two sliding handles are symmetrically provided with fifth positioning pin holes passing through near the bottom end. The upper positions of the front end fixing brackets of the two sliding handles are located on both sides of the connecting support boss, and the front end fixing brackets of the two sliding handles and the connecting support boss are rotatably fixedly connected by positioning pins passing through the fourth positioning pin holes and the first positioning pin holes, and the lower positions of the front end fixing brackets of the two sliding handles are located on both sides of the sliding fixed support seat, and the front end fixing brackets of the two sliding handles and the sliding fixed support seat are slidably and rotatably connected by positioning pins passing through the fifth positioning pin holes and the sliding limit pin holes;

[0013] A rear end limit slot of the sliding handle is provided at the rear end of the sliding handle;

[0014] A supporting spring sheet sliding groove surface is provided at the bottom position of the sliding handle, and the supporting spring sheet sliding groove surface and the front end position of the supporting spring sheet are in contact with each other;

[0015] A pedicle screw assembly is arranged inside the front end mounting and fixing section of the inner sleeve, an externally threaded screw rod is arranged at the front end of the pedicle screw assembly, a screw cap is fixedly arranged at the rear end of the externally threaded screw rod, the internal shape of the front end mounting and fixing section of the inner sleeve matches the external shape of the screw cap, the screw cap is inserted into the interior of the front end mounting and fixing section of the inner sleeve, and is fixedly connected to the inner surface of the front end mounting and fixing section of the inner sleeve;

[0016] The nail cap is a U-shaped structure. The inner surface of the U-shaped nail cap is provided with an internal thread. A connecting rod fixing groove is provided in the middle position of the U-shaped nail cap. The connecting rod fixing groove and the U-shaped limiting groove are arranged on the same side. A connecting rod is arranged in the connecting rod fixing groove. Locking positioning slots are provided on both sides of the outer surface of the U-shaped nail cap. The nail cap is inserted into the interior of the fixing section at the front end of the inner sleeve. After contacting the limiting support end face, the locking positioning slot and the locking boss are locked with each other, and the connecting rod is located in the internal position of the U-shaped limiting slot.

[0017] Preferably, a guiding slope is provided at the front end of the locking boss.

[0018] Preferably, a threaded hole is provided at the top end of the rear end limiting section of the inner sleeve at the position of the fixed end face, and a through hole is provided on the supporting spring piece at a position fixed to the fixed end face. The supporting spring piece is threadedly connected to the threaded hole at the top end of the rear end limiting section of the sleeve through a locking screw passing through the through hole on the supporting spring piece and the threaded hole at the top end of the rear end limiting section of the sleeve, thereby fixing the supporting spring piece and the fixed end face at the top end of the rear end limiting section of the inner sleeve.

[0019] Preferably, a penetrating weight-reducing observation hole is provided on the locking section at the front end of the outer sleeve.

[0020] Preferably, a sliding avoidance groove is provided at the top position of the rearmost end of the rear end support section of the outer sleeve.

[0021] Preferably, an anti-slip convex strip is provided on the outer surface of the top end of the sliding handle.

[0022] Preferably, the diameter of the locking and limiting arc groove is smaller than the outer diameter of the connecting rod.

[0023] The beneficial effects of the utility model are:

[0024] 1. Since the shape of the front end mounting section of the inner sleeve matches the external shape of the nail cap, and the connecting rod fixing groove and the U-shaped limiting groove are arranged on the same side, during the operation, the doctor can quickly align the nail cap and insert it. Moreover, since the top and bottom positions of the front end mounting section of the inner sleeve are respectively fixed with elastic locking plates, the inner end surfaces of the two elastic locking plates are respectively fixed with locking bosses. After the nail cap is inserted into the interior of the front end mounting section of the inner sleeve and contacts the limiting support end surface, the nail cap and the front end mounting section of the inner sleeve can be quickly locked through the locking positioning slot and the locking boss. The whole operation process is simple and quick, and the overall operation time is shortened.

[0025] 2. By setting a sliding handle, during the operation, the sliding handle is pressed and the outer sleeve assembly is pushed using the lever principle to position and tighten the front connecting rod, which greatly reduces the fatigue of the doctor's hands and further ensures the smooth progress of the operation.

[0026] 3. By providing a rear end limit slot of the sliding handle at the rear end position of the sliding handle and a limit rack on the rear end limit section of the inner sleeve, during the operation, when the front end of the outer sleeve assembly is pressed and fixed to the connecting rod, the rear end limit slot of the sliding handle and the limit teeth on the limit rack are locked and positioned with each other, so as to prevent the sliding handle from rebounding upward after the front end of the outer sleeve assembly is pressed and fixed to the connecting rod, causing the outer sleeve assembly to slide backward, resulting in repeated loosening of the connecting rod during the surgical operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the utility model;

[0028] Figure 2 It is another stereogram of the utility model;

[0029] Figure 3 It is the front view of the utility model;

[0030] Figure 4 This utility model Figure 3 Middle AA section view;

[0031] Figure 5 It is a three-dimensional diagram of the inner sleeve assembly of the utility model;

[0032] Figure 6 It is a stereogram of the outer sleeve assembly of the utility model;

[0033] Figure 7 This utility model Figure 1 Enlarged view of point B in the middle;

[0034] Figure 8 This utility model Figure 1 Enlarged view of point C in the middle;

[0035] Fig. 9 This utility model Figure 4 Enlarged view of point D in the middle;

[0036] Fig.10 It is a stereoscopic diagram of the pedicle screw assembly of the utility model;

[0037] Fig.11 It is a three-dimensional diagram of the limit rack of the utility model;

[0038] Fig.12 It is a three-dimensional diagram of the sliding handle of the utility model.

[0039] Explanation of symbols in the figure:

[0040] 1. Inner sleeve assembly; 101. Front end mounting fixed section of inner sleeve; 10101. Elastic locking piece; 10102. U-shaped limiting groove; 10103. Locking boss; 10104. Limiting support end surface; 102. Middle support section of inner sleeve; 10201. Connecting support boss; 10202. First positioning pin hole; 103. Rear end limiting section of inner sleeve; 10301. Fixed end surface; 10302. Rack fixing support plate; 10303. Second positioning pin hole; 2. Outer sleeve assembly; 201. Front end locking section of outer sleeve; 20101. Weight reduction observation hole; 20102. Locking limiting arc groove; 202. Rear end supporting section of outer sleeve; 20201. Sliding fixed support seat; 202 02. Sliding avoidance groove; 20203. Sliding limit pin hole; 3. Pedicle screw assembly; 301. Externally threaded screw; 302. Nail cap; 30201. Locking positioning slot; 30202. Internal thread; 303. Connecting rod fixing groove; 4. Connecting rod; 5. Sliding handle; 501. Front end fixing bracket of sliding handle; 502. Rear end limit slot of sliding handle; 503. Support spring piece sliding groove surface; 504. Anti-slip convex strip; 505. Fourth positioning pin hole; 506. Fifth positioning pin hole; 6. Limiting rack; 601. Limiting tooth; 602. Third positioning pin hole; 7. Positioning pin; 8. Support spring piece; 9. Locking screw; 10. Through hole; 11. Threaded hole; 12. Guide slope. DETAILED DESCRIPTION

[0041] The utility model is further described below in conjunction with embodiments.

[0042] pass Figure 1-Figure 12 It can be seen that the pressure rod reset pliers include an inner sleeve assembly 1, an outer sleeve assembly 2 and a sliding handle 5. The interiors of the inner sleeve assembly 1 and the outer sleeve assembly 2 are both hollow structures. The outer sleeve assembly 2 is located on the outer surface of the inner sleeve assembly 1. By pressing the sliding handle 5, the outer sleeve assembly 2 can slide along the outer surface of the inner sleeve assembly 1.

[0043] An inner sleeve front end mounting fixing section 101 is provided at the front end of the inner sleeve assembly 1, an inner sleeve middle supporting section 102 is provided at the middle position of the inner sleeve assembly 1, and an inner sleeve rear end limiting section 103 is provided at the rear end of the inner sleeve assembly 1.

[0044] A through hole 10 is provided inside the fixing section 101 at the front end of the inner sleeve, and a top screw can pass through the through hole 10 and be threadedly connected with the connecting rod fixing groove 303 on the nail cap 302 to lock and fix the connecting rod 4.

[0045] The front end fixing section 101 of the inner sleeve is installed and fixed with elastic locking pieces 10101 at the top and bottom positions near the front end respectively, and the inner end surfaces of the two elastic locking pieces 10101 are fixed with locking bosses 10103 respectively. The locking bosses 10103 can fix and lock the nail cap 302 on the pedicle screw assembly 3. The rear end position of the locking boss 10103 is provided with a limiting support end surface 10104 vertically arranged relative to the inner sleeve assembly 1. The front end fixing section 101 of the inner sleeve is installed and installed, and the left and right sides of the front end are symmetrically provided with U-shaped limiting grooves 10102 open to the front end. The U-shaped limiting grooves 10102 can limit the connecting rod. The top position of the middle supporting section 102 of the inner sleeve is fixedly provided with a connecting support boss 10201, and the connecting support boss 10201 is provided with a first positioning pin hole 10202 penetrating therethrough.

[0046] A fixed end face 10301 is provided at the top position of the rear end limit section 103 of the inner sleeve, and a supporting spring piece 8 is fixedly provided on the fixed end face 10301. The fixed end face 10301 and the middle position of the supporting spring piece 8 are fixedly connected, and the front end position and the rear end position of the supporting spring piece 8 are bent upward respectively. Rack fixing support plates 10302 are symmetrically provided at the two sides of the fixed end face 10301, and second positioning pin holes 10303 are symmetrically provided on the two rack fixing support plates 10302. A limit rack 6 is provided between 10302, and the limit rack 6 is vertically arranged upward. A limit tooth 601 is provided on the end face of the limit rack 6. A third positioning pin hole 602 is provided through the lower position of the limit rack 6. The third positioning pin hole 602 and the second positioning pin hole 10303 are internally fixedly connected with a positioning pin 7. The limit rack 6 and the rack fixing support plate 10302 are rotationally fixedly connected by the positioning pin 7, and the bottom end position of the limit rack 6 is fixedly connected to the upper surface position of the rear end of the supporting spring piece 8.

[0047] The front end position of the outer sleeve assembly 2 is provided with an outer sleeve front end locking section 201, and the rear end position of the outer sleeve assembly 2 is provided with an outer sleeve rear end supporting section 202. The left and right sides of the front end of the outer sleeve front end locking section 201 are symmetrically provided with locking limiting arc grooves 20102 opening to the front end. By setting the locking limiting arc groove 20102, during operation, the front end locking section 201 of the outer sleeve slides forward, and when the connecting rod 4 is pressed, the locking limiting arc groove 20102 contacts the outer surface of the connecting rod 4, and the arc structure of the locking limiting arc groove 20102 plays a role of tightening and limiting the arc surface of the connecting rod 4. If the front end of the outer sleeve front end locking section 201 is set as a straight face structure, when the connecting rod 4 is tightened During timing, the connecting rod 4 is prone to slide along the straight surface. A sliding fixed support seat 20201 is provided at the bottom position of the rearmost end of the outer sleeve rear end support section 202. A sliding limit pin hole 20203 is provided on the sliding fixed support seat 20201. The sliding limit pin hole 20203 is a long hole and is arranged in the vertical direction relative to the outer sleeve assembly 2. The sliding handle 5 is pressed, and the lever principle between the front end fixed bracket 501 of the sliding handle and the connecting support boss 10201 and the sliding fixed support seat 20201 is utilized to push the outer sleeve assembly 2 to slide forward along the outer surface of the inner sleeve assembly 1. When the outer sleeve assembly 2 slides forward, the positioning pin 7 slides synchronously from bottom to top in the sliding limit pin hole 20203.

[0048] The front end fixing brackets 501 of the sliding handle are symmetrically fixed on the left and right sides of the front end position of the sliding handle 5, the fourth positioning pin holes 505 are symmetrically provided near the top positions of the two sliding handle front end fixing brackets 501, and the fifth positioning pin holes 506 are symmetrically provided near the bottom positions of the two sliding handle front end fixing brackets 501. The upper positions of the two sliding handle front end fixing brackets 501 are located on both sides of the connecting support boss 10201, and the two sliding handle front end fixing brackets 501 and the connecting support boss 10201 are rotationally fixedly connected by the positioning pin 7 passing through the fourth positioning pin hole 505 and the first positioning pin hole 10202, and the lower positions of the two sliding handle front end fixing brackets 501 are located on both sides of the sliding fixed support seat 20201, and the positioning pin 7 passing through the fifth positioning pin hole is between the two sliding handle front end fixing brackets 501 and the sliding fixed support seat 20201. 506 is slidably and rotatably connected with the sliding limit pin hole 20203. A rear end position of the sliding handle is provided with a rear end limit slot 502 of the sliding handle. When the sliding handle 5 is pressed, the rear end limit slot 502 of the sliding handle slides along the limit tooth 601 on the end face of the limit rack 6. When pressed to tighten and fix the connecting rod 4, the sliding handle 5 is loosened, and the rear end limit slot 502 of the sliding handle is inserted into the tooth groove of the limit tooth 601 to lock and fix the sliding handle 5, so as to avoid the sliding handle 5 rebounding upward after the front end of the outer sleeve assembly 2 is pressed and fixed to the connecting rod, causing the outer sleeve assembly 2 to slide backward, causing the connecting rod to repeatedly loosen during the surgical operation. A supporting spring piece sliding groove surface 503 is provided at the bottom position of the sliding handle 5. The supporting spring piece sliding groove surface 503 and the front end position of the supporting spring piece 8 are in contact with each other. When the sliding handle 5 is pressed, the supporting spring piece 8 can slide along the supporting spring piece sliding groove surface 503 to support.

[0049] The front end of the inner sleeve is provided with a pedicle screw assembly 3 inside the fixing section 101, the front end of the pedicle screw assembly 3 is provided with an externally threaded screw 301, and the rear end of the externally threaded screw 301 is fixedly provided with a nail cap 302. The internal shape of the front end of the inner sleeve is matched with the external shape of the nail cap 302. The nail cap 302 is inserted into the interior of the front end of the inner sleeve and fixedly connected with the inner surface of the front end of the inner sleeve. The nail cap 302 is a U-shaped structure. The inner surface of the nail cap 302 of the U-shaped structure is provided with an internal thread 30202. The nail cap 302 of the U-shaped structure A connecting rod fixing groove 303 is provided in the middle position of the cap 302. The connecting rod fixing groove 303 and the U-shaped limiting groove 10102 are arranged on the same side direction. A connecting rod 4 is provided in the connecting rod fixing groove 303. Locking positioning slots 30201 are provided on both sides of the outer surface of the U-shaped nail cap 302. The nail cap 302 is inserted into the interior of the fixing section 101 installed at the front end of the inner sleeve. After contacting the limiting support end face 10104, the locking positioning slot 30201 and the locking boss 10103 are locked with each other, and the connecting rod 4 is located in the internal position of the U-shaped limiting groove 10102.

[0050] Since the shape of the fixing section 101 installed at the front end of the inner sleeve matches the external shape of the nail cap 302, and the connecting rod fixing groove 303 and the U-shaped limiting groove 10102 are arranged on the same side, during the operation, the doctor can quickly align the nail cap 302 and insert it. In addition, since the top and bottom positions of the fixing section 101 installed at the front end of the inner sleeve are respectively fixed with elastic locking plates 10101, and the inner end surfaces of the two elastic locking plates 10101 are respectively fixed with locking bosses 10103, after the nail cap 302 is inserted into the interior of the fixing section 101 installed at the front end of the inner sleeve and contacts with the limiting support end surface 10104, the nail cap 302 and the fixing section 101 installed at the front end of the inner sleeve can be quickly locked through the locking positioning slot 30201 and the locking boss 10103. The whole operation process is simple and quick, shortening the overall operation time.

[0051] A guiding slope 12 is provided at the front end of the locking boss 10103, which can play a good guiding role when the nail cap 302 is inserted into the front end installation fixing section 101 of the inner sleeve. During the operation, the doctor can easily install the nail cap 302 to the bottom of the front end installation fixing section 101 of the inner sleeve. At the same time, it can reduce the fatigue of the doctor's hands, shorten the overall operation time, and ensure the smooth progress of the operation.

[0052] A threaded hole 11 is provided at the top of the rear end limiting section 103 of the inner sleeve, located at the position of the fixed end face 10301, and a through hole is provided on the support spring piece 8, located at a position fixed to the fixed end face 10301. The support spring piece 8 is threadedly connected to the threaded hole 11 at the top of the rear end limiting section 103 of the sleeve through a locking screw 9 that passes through the through hole on the support spring piece 8 and the threaded hole 11 at the top of the rear end limiting section 103 of the sleeve, thereby fixing the support spring piece 8 and the fixed end face 10301 at the top of the rear end limiting section 103 of the inner sleeve.

[0053] The supporting spring piece 8 and the fixed end face 10301 at the top of the rear end limiting section 103 of the inner sleeve are fixedly connected by the locking screw 9. When the supporting spring piece 8 needs to be disassembled and replaced, only the locking screw 9 needs to be removed to quickly disassemble and assemble the supporting spring piece 8. The operation is simple and convenient, saving operation time.

[0054] A penetrating weight-reducing observation hole 20101 is provided on the front end locking section 201 of the outer sleeve. There are multiple weight-reducing observation holes 20101, which are respectively distributed at the front end, middle end and rear end of the front end locking section 201 of the outer sleeve. On the one hand, the weight-reducing observation hole 20101 can reduce the overall weight of the pressure rod reduction forceps, thereby reducing the weight borne by the doctor's hand when holding the pressure rod reduction forceps, and the doctor can complete the pressure rod reduction work more easily. On the other hand, through the weight-reducing observation hole 20101 located at the front end of the front end locking section 201 of the outer sleeve, the whole process of the top screw being screwed into the nail cap 302 can be viewed in real time, and without removing the pressure rod reduction forceps, the final locking state of the top screw on the connecting rod 4 can be intuitively seen. When a locking abnormality occurs, it can be discovered and resolved in time, avoiding the discovery of the abnormal locking of the top screw on the connecting rod 4 after the pressure rod reduction forceps are taken out, and the need to use the pressure rod reduction forceps again for operation, which leads to an extension of the overall operation time.

[0055] A sliding avoidance groove 20202 is provided at the top position of the rearmost end of the outer sleeve rear end support section 202, which can prevent the rearmost end position of the top of the outer sleeve rear end support section 202 and the connecting support boss 10201 from colliding with each other when the outer sleeve rear end support section 202 slides backward due to the sliding handle 5 opening upward at too large an angle, causing the outer sleeve rear end support section 202 or the connecting support boss 10201 to be broken, resulting in the pressure rod reset pliers being unable to be used normally.

[0056] The top outer surface of the sliding handle 5 is provided with an anti-skid convex strip 504 , which can increase the friction between the sliding handle 5 and the hand when the sliding handle 5 is pressed, so that the doctor can better press the sliding handle 5 .

[0057] The diameter of the locking and limiting arc groove 20102 is smaller than the outer diameter of the connecting rod 4, so that the locking and limiting arc groove 20102 can form a two-point symmetrical positioning and locking on the outer surface of the connecting rod 4, further increasing the stability of the locking section 201 at the front end of the outer sleeve tightening the connecting rod 4.

[0058] When using the pressure rod reduction pliers, first drive the pedicle screw into the diseased bone, put the connecting rod 4 into the connecting rod fixing groove 303 on the nail cap 302, hold the pressure rod reduction pliers, align the front end mounting fixing section 101 of the inner sleeve with the nail cap 302 and insert it, when a "click" sound is heard, it means that the front end mounting fixing section 101 of the inner sleeve and the nail cap 302 are locked in place, at this time, the locking positioning slot 30201 on the nail cap 302 and the locking boss 10103 on the front end mounting fixing section 101 of the inner sleeve are locked with each other, and then, press the sliding handle 5, and use the lever principle between the front end fixing bracket 501 of the sliding handle and the connecting support boss 10201 and the sliding fixed support seat 20201 to push the outer sleeve assembly 2 to slide forward along the outer surface of the inner sleeve assembly 1 until the front end locking section 20 1, the locking limit arc groove 20102 at the front end of the connecting rod 4 is tightened and then stopped. At this time, the limit groove 502 at the rear end of the sliding handle is inserted into the tooth groove of the limit tooth 601 to lock and fix the sliding handle 5 to prevent the sliding handle 5 from rebounding upward. Next, the top screw is passed through the through hole 10 inside the inner sleeve assembly 1, and is screwed into the inside of the connecting rod fixing groove 303 on the nail cap 302 until the connecting rod 4 is tightened. At this time, the final locking state of the top screw on the connecting rod 4 can be checked through the weight-reducing observation hole 20101 located at the front end of the locking section 201 at the front end of the outer sleeve. If the locking is not in place, the top screw can be directly locked repeatedly to avoid finding that the top screw is not locked in place on the connecting rod 4 after the pressure rod reset pliers are taken out, and the pressure rod reset pliers need to be used again for repeated operations, which prolongs the overall operation time.

[0059] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A pressure rod reduction forceps, characterized by: It includes an inner sleeve assembly, an outer sleeve assembly and a sliding handle, wherein the inner sleeve assembly and the outer sleeve assembly are both hollow structures, and the outer sleeve assembly is located on the outer surface of the inner sleeve assembly. When the sliding handle is pressed, the outer sleeve assembly can slide along the outer surface of the inner sleeve assembly. The front end of the inner sleeve assembly is provided with an inner sleeve front end mounting and fixing section, the middle of the inner sleeve assembly is provided with an inner sleeve middle supporting section, and the rear end of the inner sleeve assembly is provided with an inner sleeve rear end limiting section; A through hole is provided inside the front end mounting and fixing section of the inner sleeve, and elastic locking sheets are fixedly provided at the top and bottom positions of the front end of the inner sleeve front end mounting and fixing section respectively, and locking bosses are fixedly provided at the inner end surfaces of the two elastic locking sheets respectively, and a limiting support end surface vertically arranged relative to the inner sleeve assembly is provided at the rear end position of the locking boss, and U-shaped limiting grooves opening to the front end are symmetrically provided at the left and right sides of the front end of the front end mounting and fixing section of the inner sleeve; A connecting support boss is fixedly provided at the top position of the middle support section of the inner sleeve, and a first positioning pin hole is provided on the connecting support boss; The top position of the rear end limit section of the inner sleeve is provided with a fixed end face, and a supporting spring piece is fixedly provided on the fixed end face, and the fixed end face and the middle position of the supporting spring piece are fixedly connected, and the front end position and the rear end position of the supporting spring piece are bent upwards respectively, and rack fixing support plates are symmetrically provided at the two sides of the fixed end face, and second positioning pin holes are symmetrically provided on the two rack fixing support plates, and a limiting rack is provided between the two rack fixing support plates, and the limiting rack is vertically arranged upward, and a limiting tooth is provided on the end face of the limiting rack, and a third positioning pin hole is penetrated by the lower position of the limiting rack, and a positioning pin is fixedly connected inside the third positioning pin hole and the second positioning pin hole, and the limiting rack and the rack fixing support plate are rotatably fixedly connected by the positioning pin, and the bottom end position of the limiting rack is fixedly connected to the rear end upper surface position of the supporting spring piece; The front end position of the outer sleeve assembly is provided with an outer sleeve front end locking section, the rear end position of the outer sleeve assembly is provided with an outer sleeve rear end supporting section, the front end left and right sides of the outer sleeve front end locking section are symmetrically provided with locking limit arc grooves opening to the front end, the bottom position of the rear end of the outer sleeve rear end supporting section is provided with a sliding fixed support seat, and the sliding fixed support seat is provided with a penetrating sliding limit pin hole; The front end fixing brackets of the sliding handle are symmetrically fixed on the left and right sides of the front end position of the sliding handle, and the two front end fixing brackets of the sliding handle are symmetrically provided with fourth positioning pin holes passing through near the top end, and the two front end fixing brackets of the sliding handle are symmetrically provided with fifth positioning pin holes passing through near the bottom end. The upper positions of the two front end fixing brackets of the sliding handle are located on both sides of the connecting support boss, and the two front end fixing brackets of the sliding handle and the connecting support boss are rotatably fixedly connected by positioning pins passing through the fourth positioning pin holes and the first positioning pin holes, and the lower positions of the two front end fixing brackets of the sliding handle are located on both sides of the sliding fixed support seat, and the two front end fixing brackets of the sliding handle and the sliding fixed support seat are slidably and rotatably connected by positioning pins passing through the fifth positioning pin holes and the sliding limit pin holes; A rear end limit slot of the sliding handle is provided at the rear end of the sliding handle; A supporting spring sheet sliding groove surface is provided at the bottom position of the sliding handle, and the supporting spring sheet sliding groove surface and the front end position of the supporting spring sheet are in contact with each other; A pedicle screw assembly is provided inside the front end mounting and fixing section of the inner sleeve, an externally threaded screw is provided at the front end of the pedicle screw assembly, a screw cap is fixedly provided at the rear end of the externally threaded screw, the internal shape of the front end mounting and fixing section of the inner sleeve matches the external shape of the screw cap, the screw cap is inserted into the interior of the front end mounting and fixing section of the inner sleeve, and is fixedly connected to the inner surface of the front end mounting and fixing section of the inner sleeve; The nail cap is a U-shaped structure, and the inner surface of the nail cap of the U-shaped structure is provided with an internal thread. A connecting rod fixing groove is provided in the middle position of the nail cap of the U-shaped structure. The connecting rod fixing groove and the U-shaped limiting groove are arranged on the same side direction. A connecting rod is provided in the connecting rod fixing groove. Locking positioning slots are provided on both sides of the outer surface of the nail cap of the U-shaped structure. After the nail cap is inserted into the interior of the fixing section installed at the front end of the inner sleeve and contacts the limiting support end face, the locking positioning slot and the locking boss are locked with each other, and the connecting rod is located in the internal position of the U-shaped limiting slot.

2. The pressure rod reduction forceps according to claim 1, characterized in that: A guiding inclined surface is arranged at the front end of the locking boss.

3. The pressure rod reduction forceps according to claim 1, characterized in that: A threaded hole is provided at the top of the rear end limiting section of the inner sleeve at the position of the fixed end face, and a through hole is provided on the supporting spring piece at a position fixed to the fixed end face. The supporting spring piece is threadedly connected to the threaded hole at the top of the rear end limiting section of the sleeve through a locking screw passing through the through hole on the supporting spring piece and the threaded hole at the top of the rear end limiting section of the sleeve, thereby fixing the supporting spring piece and the fixed end face at the top of the rear end limiting section of the inner sleeve.

4. The pressure rod reduction forceps according to claim 1, characterized in that: A penetrating weight-reducing observation hole is provided on the front end locking section of the outer sleeve.

5. The pressure rod reduction forceps according to claim 1, characterized in that: A sliding avoidance groove is provided at the top position of the rear end of the rear end support section of the outer sleeve.

6. The pressure rod reduction forceps according to claim 1, characterized in that: The outer surface of the top end of the sliding handle is provided with an anti-slip convex strip.

7. The pressure rod reduction forceps according to claim 1, characterized in that: The diameter of the locking and limiting arc groove is smaller than the outer diameter of the connecting rod.

Images