CN113440235A - Rod pressing system and method for minimally invasive spine surgery - Google Patents
Rod pressing system and method for minimally invasive spine surgery Download PDFInfo
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- CN113440235A CN113440235A CN202110694421.9A CN202110694421A CN113440235A CN 113440235 A CN113440235 A CN 113440235A CN 202110694421 A CN202110694421 A CN 202110694421A CN 113440235 A CN113440235 A CN 113440235A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7041—Screws or hooks combined with longitudinal elements which do not contact vertebrae with single longitudinal rod offset laterally from single row of screws or hooks
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
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- Heart & Thoracic Surgery (AREA)
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Abstract
The patent discloses a bar pressing system and a method for minimally invasive spine surgery, and the system comprises: the rod pressing barrel comprises a barrel body, and the barrel body is provided with a circular cavity which penetrates through the barrel body up and down; a handle is fixedly arranged on the outer surface of the cylinder body; a lock catch is arranged on the cylinder body and slides between a first position and a second position; the top end of the extension cylinder is provided with a thread matched with the bottom end of the rod pressing cylinder, the middle of the extension cylinder is provided with a through hole which is communicated up and down, and the through hole accommodates the implantation rod and the plunger; the bottom end of the extension cylinder is engaged with a screw cap of an implantation screw so as to be fixed with the implantation screw in a position keeping manner in the vertical direction; the pressing rod comprises a rod body and a handle, and a limiting ring is arranged on the upper portion of the rod body. The plunger and the rod are implanted into the screw cap through the linkage effect of the rod pressing barrel and the rod pressing rod, then the rod pressing rod rotates the plunger to position the rod pressing rod, and therefore the long screw cap is not needed to be arranged to facilitate operation from the outside of the skin.
Description
Technical Field
The patent belongs to the technical field of medical instruments, and particularly relates to a rod pressing system and method for minimally invasive spine surgery.
Background
Minimally invasive surgery is a trend in surgical development. Compared with the conventional open surgery, the spine minimally invasive surgery has the advantages of small tissue trauma, small bleeding, quick postoperative recovery, low cost and the like, and is more easily accepted by patients. Spinal surgery typically employs nail and rod implants to immobilize a diseased segment of the spine. When the spinal column minimally invasive surgery is performed, the skin opening is small, the surgical field is poor, a plurality of surgical operations are difficult to perform compared with open surgery, and particularly, the spinal column minimally invasive surgery is difficult to install in place due to interference of factors such as subcutaneous tissues and the like in the installation process of the implanted rod, and the operation of pressing the rod is needed.
Aiming at the problem of the operation of the pressing rod in the spinal minimally invasive surgery, most of the methods adopted in the market are to change the structure of the screw, namely, on the premise of keeping an effective structure fixed in the screw, a structure auxiliary pressing rod is additionally added, the length of a screw cap at the tail part of the screw is typically prolonged, the thread of the screw cap is simultaneously prolonged, the rod is pressed into the screw cap along the same thread by a plunger, and the redundant length is broken off after the completion, as in the patent of CN 201721055619.8. Although this approach may relatively simplify the rod pressing operation, it is eventually necessary to break off the excess screw structure, and the fracture tends to be rough, which may cause strong irritation to the patient's tissue.
Disclosure of Invention
This patent is proposed based on the above-mentioned needs of the prior art, and this patent is to solve the technical problem including: the rod pressing device for minimally invasive spine surgery is provided, the screw structure is prevented from being changed, and meanwhile, the safety and simplicity of operation are guaranteed.
In order to solve the technical problem, the technical scheme provided by the patent comprises the following steps.
A compression bar system for minimally invasive spinal surgery, the system comprising: the rod pressing barrel comprises a barrel body, and the barrel body is provided with a circular cavity which penetrates through the barrel body up and down; a handle is fixedly arranged on the outer surface of the cylinder body; the cylinder is provided with a lock catch, one side of the lock catch extends out of the outer peripheral wall of one side of the cylinder, the other side of the lock catch is accommodated in a groove formed in the inner peripheral wall of the other side of the cylinder, a first longitudinal through hole is formed in the middle of the lock catch, the lock catch slides between a first position and a second position, and the overlapping area of the first through hole and the circular cavity at the first position is smaller than the overlapping area of the first through hole and the circular cavity at the second position; the bottom end of the rod pressing cylinder is provided with threads; the top end of the extension cylinder is provided with a thread matched with the bottom end of the rod pressing cylinder, the middle of the extension cylinder is provided with a through hole which is communicated up and down, and the through hole accommodates the implantation rod and the plunger; the bottom end of the extension cylinder is engaged with a screw cap of an implantation screw so as to be fixed with the implantation screw in a position keeping manner in the vertical direction; the rod pressing rod comprises a rod body and a handle, a limiting ring is arranged at the upper part of the rod body, the diameter of the limiting ring allows the limiting ring to pass through a space where the lock catch and the circular cavity are overlapped when the lock catch is located at the second position, and the limiting ring is limited from passing through a space where the lock catch and the circular cavity are overlapped when the lock catch is located at the first position; the top shape of the plunger rod is matched with that of the plunger.
Preferably, a transverse opening is formed in one side wall surface of the upper portion of the rod pressing cylinder, a transverse groove is further formed in the inner wall of the other side of the cylinder body corresponding to the transverse opening, an accommodating space is formed by the opening, the groove and a cavity formed in the upper portion of the rod pressing cylinder and communicated with the opening, and a lock catch is accommodated in the accommodating space.
Preferably, a spring is arranged at one end of the lock catch matched with the groove, and the elastic force direction of the spring points to the direction of the lock catch separated from the groove. One side of the lock catch, which corresponds to the open hole, is provided with a longitudinal second through hole, the press rod cylinder penetrates through the second through hole and is provided with a locking pin, the diameter of the locking pin is smaller than that of the second through hole, when the lock catch is positioned at a first position, the spring enables the inner wall of the second through hole of the lock catch to abut against the locking pin, the lock catch is locked at the first position, and the lock catch is allowed to be separated from the first position and enter a second position when the lock catch is pressed.
Preferably, the connection structure between the lock catch and the spring is preferably in a cylindrical manner, that is, a cylinder is arranged on the outer side of the lock catch, the spring is a solenoid spring, and the cylinder is arranged in a circle in the middle of the solenoid spring, so that the elastic force can be kept stable.
According to another aspect of the patent, a rod pressing method is further provided, which is characterized in that the method is realized by adopting the rod pressing system as described in any one of the above, and the rod pressing method comprises the following steps: step one, implanting a rod and a plunger of a nail rod system into a rod pressing cylinder, and meshing the bottom end of an extension cylinder with a nail cap of a screw in the nail rod system;
secondly, pressing a lock catch to the second position, placing a rod pressing rod into the rod pressing barrel, then loosening the lock catch to place a limiting ring of the rod pressing rod below the lock catch, and enabling the rod pressing rod to abut against the plunger;
rotating a handle of the rod pressing barrel to drive the rod pressing barrel downwards, and driving the rod pressing barrel to drive the rod pressing rod to press down a plunger and a rod of the nail rod system;
and step four, after the plunger moves downwards to contact with the screw cap of the screw, rotating the handle of the rod pressing rod to screw the plunger into the screw cap of the screw.
This patent is through a pressure excellent section of thick bamboo and the linkage effect of pressure excellent pole implant screw cap department with the stick earlier, then reuse pressure excellent pole rotating plunger will press excellent pole to go into the position, need not to set up very long nail cap like this in order to make things convenient for from the skin external operation, then need again after going into the position to cut the nail cap and cause the foreign matter to feel strong. In addition, the nail and rod system can be conveniently taken out in a minimally invasive mode when necessary through the reverse operation of the scheme.
Drawings
FIG. 1 is a schematic structural view of a rod pressing cylinder provided in an embodiment of the present patent;
FIG. 2 is a cross-sectional structural view of a rod pressing cylinder provided in an embodiment of the present patent;
FIG. 3 is a schematic view of a movable latch according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a plunger rod according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a plunger rod according to an embodiment of the present invention;
FIG. 6 is a schematic view of the engagement between the plunger barrel and the plunger rod in this embodiment of the present invention;
FIG. 7 is a schematic view of the engagement between the plunger barrel and the plunger rod in this embodiment of the present invention;
FIG. 8 is a schematic view of a partially enlarged structure of a plunger barrel according to an embodiment of the present invention;
FIG. 9 is an enlarged partial schematic view of a plunger rod according to an embodiment of the present invention;
FIG. 10 is an enlarged view of a portion of the connection process of the plunger barrel and plunger rod in accordance with an embodiment of the present invention;
FIG. 11 is a schematic view of the configuration of the extension barrel engaged with the screw cap according to the embodiment of the present patent.
Detailed Description
The following detailed description of the present patent application is provided in conjunction with the accompanying drawings, and it should be noted that this detailed description is only exemplary of the preferred embodiments of the patent, and should not be construed as limiting the scope of the patent.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.
Example one
The embodiment provides a rod pressing system for minimally invasive spine surgery, which is mainly used for performing rod pressing operation on a titanium rod to fix the titanium rod in place when a screw rod system, such as a pedicle screw, the titanium rod and a plunger, is implanted in the posterior path of the thoracolumbar spine. In the embodiment, the rod pressing system of the minimally invasive spine surgery acts on the nail rod system arranged on the spine through the cooperation of the three parts of the rod pressing cylinder 1, the rod pressing rod 2 and the extension cylinder 3 so as to complete the rod pressing operation.
In the present embodiment, the structure of the plunger barrel is shown in fig. 1 and 2.
The rod pressing barrel comprises a barrel body 10, wherein the barrel body is integrally cylindrical and is provided with a hollow cylindrical cavity 11. The cavity penetrates through the barrel body. In this embodiment, the diameter of the cavity is gradually increased from top to bottom. Preferably, the pore size is three-stage, i.e., the diameter of the uppermost cavity is smallest, the diameter of the middle cavity is centered, and the diameter of the lowermost cavity is largest. The provision of the above-described diameter structure can facilitate the fitting operation of the plunger cylinder with the plunger rod, which will be described later in this embodiment.
The lower end of the plunger barrel is preferably provided with a thread 12, which may be an internal thread or an external thread, by means of which the plunger barrel can be connected to the extension barrel 3. The extension cylinder has a structure as shown in fig. 8, and in the present embodiment, as shown in fig. 11, the extension cylinder includes a cylinder body having a passage 31 formed therethrough in the upper and lower direction at the center thereof, and a screw thread 32 formed at the top end thereof and engaged with the screw thread 12 formed at the bottom end of the plunger cylinder, thereby guiding the plunger cylinder to move up and down with respect to the extension cylinder when the plunger cylinder is rotated based on a handle operation. The bottom end of the extension barrel is provided with a nut engaging portion 33 which engages with a nut of a screw of the nail rod system, and the top of the nut engaging portion has a blocking step 34 to abut against the top surface of the nut. Thus, after the extension barrel is engaged with the nail cap, the positions of the extension barrel and the nail cap in the vertical direction can be relatively fixed.
In this embodiment, the outer surface of the plunger barrel is also formed in a stepped shape, i.e. the upper part 13 of the plunger barrel has a first outer diameter and the lower part 14 of the plunger barrel has a second outer diameter, wherein the outer diameter of the upper part 13 is larger than the outer diameter of the lower part 14. By the above structure, a step-like structure is formed at the junction of the upper portion 13 and the lower portion 14, so that a step is formed at the junction between the two same bodies.
A rotary handle 15 is provided on the lower portion 13, the rotary handle comprising a sleeve 151 and a grip provided on the peripheral wall of the sleeve, the grip preferably being provided along the diameter of the sleeve and, preferably, being provided with a texture to be non-slip and stable when operated by a person. In the present embodiment, the size of the handle is set according to the size of the palm of the human hand, so as to facilitate the operation of the human hand. The rotating handle 14 is fixed with the plunger barrel, and particularly preferably, the rotating handle is arranged on the part of the periphery of the plunger barrel corresponding to the second step inside the plunger barrel. In this way, since the diameter of the second step is smaller, the side wall is thicker at this position so that a longer fixing pin 15 can be installed, thereby fixing the rotating handle on the rod pressing cylinder, and when the rotating handle is operated, the rod pressing cylinder can synchronously rotate to complete corresponding operation of the nail rod system. Besides the structure of the fixing pin, in this embodiment, alternatively, a plurality of connection modes such as a screw, a bolt, or welding, clamping, etc. may be adopted, and the connection mode provided at the position corresponding to the second step may also provide stable support for the operation of the rotating handle due to the thicker wall.
A transverse opening is formed in one side wall surface of the upper portion 13 of the rod pressing barrel, a transverse groove is formed in the inner wall of the other side of the barrel body corresponding to the transverse opening, a containing space is formed by the opening 17, the groove 18 and a cavity formed in the upper portion of the rod pressing barrel and communicated with the opening 17, the groove 18 and the cavity, and the lock catch 16 is contained in the containing space.
In this embodiment, the lock catch is configured as shown in fig. 3, the lock catch is a sheet, and may be made of metal or plastic with high strength, and the middle of the lock catch is provided with a first through hole 161, and preferably, the diameter of the through hole is the same as that of the through hole in the upper portion of the rod pressing barrel, so that in the first position, the two through holes are overlapped to facilitate the rod pressing rod 2 to pass through.
In this embodiment, a longitudinal second through hole 162 is formed in one side of the lock catch corresponding to the opening, the second through hole is located in a side portion and corresponds to a longitudinal blind hole 19 formed in the upper surface of the rod pressing cylinder, when the lock catch is located at the second position, the second through hole 162 is communicated with the blind hole, and a fixing pin 163 is arranged in the blind hole from top to bottom. So as to lock the relative position of the lock catch and the press rod cylinder at the second position. The diameter of the second through hole is larger than that of the blind hole, so that the lock catch can slide between the first position and the second position in the accommodating space. And a spring 164 is arranged at one end of the lock catch matched with the groove, and the elastic force direction of the spring points to the direction of the lock catch separated from the groove. Thus, in the second position, the elastic force of the spring drives a sidewall of the second through hole of the latch to abut against the locking pin 163, thereby fixing the latch in the second position.
The side of the latch adjacent to the opening 17 is disposed to protrude from the outer sidewall of the plunger so that the latch can be pushed from the second position to the first position by pressing the latch.
The connection between the latch and the spring 164 is preferably in the form of a cylinder, i.e. a cylinder 165 is provided on the outside of the latch, the spring is a solenoid spring, and the cylinder is disposed in a circle in the middle of the solenoid spring, so that the elastic force is kept stable.
In the present embodiment, the rod pressing system for minimally invasive spine surgery further comprises a rod pressing rod 2, the structure of the rod pressing rod 2 is shown in fig. 4 and 5, and the rod pressing rod comprises an outer rod 21 and an inner rod 22.
Said outer rod 21 is arranged externally, in which a cavity is provided, in which the inner rod is partially arranged. In the present embodiment, the outer lever includes a tube portion 26 and a handle portion 23, and a handle is provided on an outer periphery of the handle portion 23, and an operator operates the plunger lever by operating the handle. In this embodiment, a tube portion extends downward from a lower portion of the handle portion. The upper portion position of the pipe portion is provided with a limiting ring 24, the limiting ring is fixedly arranged on the pipe portion, the limiting ring 24 and the rod pressing barrel act together, and the rod pressing barrel is operated to drive the limiting ring 24 downwards in a mode of abutting against the limiting ring 24 so as to drive the rod pressing rod to move downwards to achieve rod pressing action. A plurality of positioning posts 25 are also provided around the periphery of the tube, and the positioning posts are of a relatively large diameter, so that the inner rod can be held at a relatively central position in the tube.
As shown in fig. 6, 7, 8 and 10, in the present embodiment, when the lock catch of the plunger is located at the first position, i.e. the pressed-down position, the overlapping area of the first through hole in the lock catch and the through hole in the plunger is large, so that a channel is formed, and the channel allows the stop collar 24 of the outer rod to pass through the channel and enter the inside of the plunger.
As shown in fig. 10, after the plunger rod enters the inside of the plunger barrel, the lock catch is released, and the lock catch is in the second position, at which the overlapping area between the lock catch and the through hole in the plunger barrel is small, so that the stop collar 24 is not allowed to pass through the overlapping area. At the moment, when the rod pressing barrel moves downwards under the driving of the handle, the lower surface of the lock catch of the rod pressing barrel drives the limiting ring to move downwards synchronously, so that the rod pressing rod is driven to move downwards, and the action of pressing the rod downwards is realized.
Example two
The present embodiment provides a rod pressing method, which is implemented by using the rod pressing system as described in the first embodiment or any one of the summary of the invention in the specification.
The method comprises the following steps:
step one, implanting a rod and a plunger of the nail rod system into the rod pressing barrel, and engaging the bottom end of the extension barrel with a screw cap of a screw in the nail rod system.
In this step, the rod pressing operation is mainly prepared, at this time, the plunger and the rod body are implanted in the rod pressing barrel, so that the subsequent rod pressing operation is facilitated, and the bottom end of the extension barrel is meshed with the top end of the screw cap, namely, the extension barrel and the screw cap of the screw are relatively fixed in position.
And secondly, pressing the lock catch, implanting the rod pressing rod into the rod pressing barrel, then loosening the lock catch to place the limiting ring of the rod pressing rod below the lock catch, and enabling the rod pressing rod to abut against the plunger.
And step three, rotating a handle of the rod pressing barrel to drive the rod pressing barrel downwards, and driving the rod pressing barrel to drive the rod pressing rod to press down the plunger and the rod of the nail rod system.
And step four, after the plunger moves downwards to contact with the screw cap of the screw, rotating the handle of the rod pressing rod to screw the plunger into the screw cap of the screw.
Through the mode, the plunger and the rod are implanted into the screw cap firstly under the linkage action of the rod pressing barrel and the rod pressing rod in the embodiment, then the rod pressing rod is rotated by the plunger rod pressing rod, so that the long screw cap is not required to be arranged to facilitate the operation from the outside of the skin, and the screw cap is required to be cut off after the position is placed, so that the foreign body sensation is strong. In addition, the nail and rod system can be conveniently taken out in a minimally invasive mode when necessary through the reverse operation of the scheme.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (5)
1. A compression bar system for minimally invasive spinal surgery, the system comprising:
the rod pressing barrel comprises a barrel body, and the barrel body is provided with a circular cavity which penetrates through the barrel body up and down; a handle is fixedly arranged on the outer surface of the cylinder body; the cylinder is provided with a lock catch, one side of the lock catch extends out of the outer peripheral wall of one side of the cylinder, the other side of the lock catch is accommodated in a groove formed in the inner peripheral wall of the other side of the cylinder, a first longitudinal through hole is formed in the middle of the lock catch, the lock catch slides between a first position and a second position, and the overlapping area of the first through hole and the circular cavity at the first position is smaller than the overlapping area of the first through hole and the circular cavity at the second position; the bottom end of the rod pressing cylinder is provided with threads;
the top end of the extension cylinder is provided with a thread matched with the bottom end of the rod pressing cylinder, the middle of the extension cylinder is provided with a through hole which is communicated up and down, and the through hole accommodates the implantation rod and the plunger; the bottom end of the extension cylinder is engaged with a screw cap of an implantation screw so as to be fixed with the implantation screw in a position keeping manner in the vertical direction;
the rod pressing rod comprises a rod body and a handle, a limiting ring is arranged at the upper part of the rod body, the diameter of the limiting ring allows the limiting ring to pass through a space where the lock catch and the circular cavity are overlapped when the lock catch is located at the second position, and the limiting ring is limited from passing through a space where the lock catch and the circular cavity are overlapped when the lock catch is located at the first position; the top shape of the plunger rod is matched with that of the plunger.
2. The rod pressing system for minimally invasive spine surgery as claimed in claim 1, wherein a transverse opening is formed in one side wall surface of the upper portion of the rod pressing cylinder, a transverse groove is formed in the inner wall of the other side of the cylinder body corresponding to the transverse opening, the groove and a cavity formed in the upper portion of the rod pressing cylinder and communicated with the opening form a containing space, and a lock catch is contained in the containing space.
3. The rod pressing system for minimally invasive spine surgery as claimed in claim 2, wherein a spring is disposed at one end of the lock catch, which is engaged with the groove, and the elastic force direction of the spring points to the direction in which the lock catch is disengaged from the groove. One side of the lock catch, which corresponds to the open hole, is provided with a longitudinal second through hole, the press rod cylinder penetrates through the second through hole and is provided with a locking pin, the diameter of the locking pin is smaller than that of the second through hole, when the lock catch is positioned at a first position, the spring enables the inner wall of the second through hole of the lock catch to abut against the locking pin, the lock catch is locked at the first position, and the lock catch is allowed to be separated from the first position and enter a second position when the lock catch is pressed.
4. The rod pressing system for minimally invasive spine surgery as recited in claim 3, wherein the connection structure between the lock and the spring is preferably in a cylindrical manner, that is, a cylinder is arranged on the outer side of the lock, the spring is a solenoid spring, and the cylinder is arranged in a circle in the middle of the solenoid spring, so that the elastic force can be kept stable.
5. A rod pressing method, characterized in that the method is realized by the rod pressing system according to any one of claims 1-4, and the rod pressing method comprises the following steps: step one, implanting a rod and a plunger of a nail rod system into a rod pressing cylinder, and engaging the bottom end of an extension cylinder with a screw cap of a screw in the nail rod system;
secondly, pressing a lock catch to the second position, placing a rod pressing rod into the rod pressing barrel, then loosening the lock catch to place a limiting ring of the rod pressing rod below the lock catch, and enabling the rod pressing rod to abut against the plunger;
rotating a handle of the rod pressing barrel to drive the rod pressing barrel downwards, and driving the rod pressing barrel to drive the rod pressing rod to press down a plunger and a rod of the nail rod system;
and step four, after the plunger moves downwards to contact with the screw cap of the screw, rotating the handle of the rod pressing rod to screw the plunger into the screw cap of the screw.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110694421.9A CN113440235B (en) | 2021-06-22 | 2021-06-22 | Rod pressing system and method for minimally invasive spine surgery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110694421.9A CN113440235B (en) | 2021-06-22 | 2021-06-22 | Rod pressing system and method for minimally invasive spine surgery |
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| CN113440235A true CN113440235A (en) | 2021-09-28 |
| CN113440235B CN113440235B (en) | 2023-02-24 |
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