Rod pressing method and rod pressing device

Abstract

The invention belongs to the field of medical instruments, and particularly relates to a rod pressing method and a rod pressing device, and the rod pressing device comprises a middle shell which is internally provided with a first space and is fixedly provided with an expansion piece; the connector has elasticity expanding outwards, a containing space is formed in the connector, and at least part of the expanding part extends into the containing space to push the connector to expand; a second space is formed in the outer shell, the outer shell is arranged on the outer sides of the middle shell and the connector in a relatively movable and sleeving mode in the extending direction and at least partially covers the connector, the front end of the outer shell also has elasticity expanding outwards, a second notch is formed in the front end of the outer shell, the front end of the middle shell and the second notch form a first channel, and the middle shell moves forwards to push the titanium rod to be combined with the screw; the first handle is connected with the connector; the second handle is pivotally connected with the first handle and is connected with the shell; and the third handle is pivotally connected with the first handle and is connected with the middle shell. The second handle and the third handle are pulled open and pressed down, so that the rod pressing efficiency is improved while the stability is guaranteed.

Description

Technical Field

[0001] This patent belongs to the field of medical devices, and specifically relates to a rod pressing method and a rod pressing device. Background Art

[0002] The screw plug parts in the traditional posterior nail rod fixing structure are small, which makes installation difficult and requires a certain amount of time and effort. In addition, the screw seat is large in size, which will interfere with and damage the soft tissue of the human body, prolonging the patient's recovery period. In the prior art, it is necessary to screw the screw into the corresponding bone position, adjust the curvature of the titanium rod to fit the bone, and then combine it with the screw. However, due to the limited space in the body, manual alignment and combination of the titanium rod and the screw are difficult, and the quality of the combination effect is affected by human factors. Therefore, a more stable and convenient combination method is needed. Summary of the invention

[0003] This patent is proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by this patent is to provide a rod pressing method and a rod pressing device to improve the efficiency of rod pressing while ensuring stability.

[0004] In order to solve the above problems, the technical solutions provided by this patent include:

[0005] A rod pressing method is provided, comprising:

[0006] The rod pressing process is performed by pulling the handle of the rod pressing device, and the rod pressing device comprises: a middle shell having a first space therein, and an expansion piece is fixedly arranged on the middle shell; a connecting head is relatively movably arranged in the first space along the extension direction, and is at least partially exposed outside the first space, the connecting head has the elasticity to expand outward, and is provided with a accommodating space therein, and the expansion piece at least partially extends into the accommodating space to promote the expansion of the connecting head; an outer shell having a second space therein, and is relatively movably arranged on the outer side of the middle shell and the connecting head along the extension direction, and at least partially covers the connecting head, the front end of the outer shell also has the elasticity to expand outward, and the front end of the outer shell is provided with a second notch, and the front end of the middle shell and the second notch form a first channel; a first handle is connected to the connecting head; a second handle is pivotally connected to the first handle and is connected to the outer shell; a third handle is pivotally connected to the first handle and is connected to the middle shell. Shell; pull the second handle and the third handle of the rod press to make the second handle and the third handle move away from the first handle, the outer shell moves upward, the middle shell moves downward, the expansion piece moves to the first position with the middle shell, and the connecting head is in an outward expansion state under the action of the expansion piece, and the expansion piece pushes the front end side wall of the outer shell to expand outward to provide space for connecting and accommodating some screws; press the third handle to move it in the direction close to the first handle, the expansion piece leaves the first position, the connecting head changes from expansion to a natural state, the outer shell changes to a natural state due to lack of supporting force, the connecting head clamps the screw, and the middle shell moves upward to push the titanium rod placed on the upper edge of the middle shell to move along the first channel toward the screw, thereby realizing pre-pressing of the titanium rod and the screw; press the second handle to move it in the direction close to the first handle, drive the outer shell to move downward, pull the screw to move downward accordingly, so that it combines with the screw to realize rod pressing.

[0007] After the above arrangement, the clamping end (connector and shell front end) can be opened and clamped by rotating the angle between the second handle and the first handle and the third handle and the first handle, and positioning can be achieved by clamping, and the titanium rod is pushed to the position of the screw through the middle shell, and the screw is pulled close to the titanium rod, so that the two are combined. The above arrangement ensures the accuracy of the connection and the convenience of operation.

[0008] The connecting head includes a base and two opposing support rods arranged on the base, the distance between the middle parts of the two support rods is smaller than the outer diameter of the expander, and the distance between the two support rods at other positions is equal to the outer diameter of the expander; when the expander moves to the middle part of the support rod, the two support rods will be relatively separated so that the diameter of the front end of the connecting head increases; when the expander moves to other positions, the distance between the two support rods remains unchanged and is in a natural state.

[0009] The expansion of the connector is achieved through the above-mentioned specific structure.

[0010] The second notch at the front end of the shell is formed by the shell side walls that are opposite and spaced from each other, and the shell side walls have a gap extending along the extension direction, and the top end of the support rod is adapted to the gap; when the connector expands, the top end of the support rod is expanded and inserted into the gap, and the other parts of the support rod other than those corresponding to the gap at least partially cover the shell side walls that form the second notch, and during the expansion of the connector, it abuts against the shell side walls and pushes the shell side walls to expand outward.

[0011] The expansion of the front end of the housing driven by the connector is achieved through the above-mentioned specific structure.

[0012] The front end of the middle shell is provided with a notch, which is formed by a first side wall and a second side wall spaced apart on the middle shell. The notch is adapted to the support rod, so that the support rod of the connector crosses the middle shell and abuts against the outer shell in an expanded state.

[0013] Preferably, the second handle is provided with a first hole and a second hole, the first hole is located above the second hole; the second handle is connected to the shell through a first connecting module, one end of the first connecting module is pivotally connected to the second hole, and the other end of the first connecting module is pivotally connected to the lower end of the shell.

[0014] By driving the shell to move through the state of the second handle, when the second handle approaches the first handle, the shell moves downward relatively, and when the second handle moves away from the first handle, the shell moves upward, so that the required state of the shell can be adjusted according to actual conditions.

[0015] Preferably, a first protrusion is provided at the lower position of the shell, and a first preset opening is provided on the first protrusion; the first preset opening is opposite to the first corresponding opening on the other end of the first connecting module, and a third pin passes through the first preset opening and the first corresponding opening so that the two can be connected in relative rotation.

[0016] The above arrangement facilitates the connection between the housing and the second handle without affecting the relative movement of the components.

[0017] Preferably, the third handle is provided with a first opening and a second opening, the first opening is located below the second opening; the third handle is connected to the middle shell through a second connecting module, one end of the second connecting module is pivotally connected to the second opening, and the other end of the second connecting module is pivotally connected to the lower end of the middle shell.

[0018] By driving the middle shell to move through the state of the third handle, when the third handle approaches the first handle, the outer shell moves up relatively, and when the third handle moves away from the first handle, the outer shell moves down, so that the required state of the middle shell can be adjusted according to actual conditions.

[0019] Preferably, a second protrusion is provided at the lower position of the middle shell, and a second preset opening is provided on the second protrusion; the second preset opening corresponds to the first positioning opening on the other end of the second connecting module, and the sixth pin passes through the second preset opening and the first positioning hole so that the two can be connected in relative rotation.

[0020] The above arrangement facilitates the connection between the housing and the second handle without affecting the relative movement of the components.

[0021] Preferably, a first connecting hole and a second connecting hole are provided on the first handle; the first connecting hole corresponds to the first hole on the second handle, and the first pin passes through the first connecting hole and the first hole at the same time so that the two can rotate relative to each other; the second connecting hole corresponds to the first opening on the third handle, and the second pin passes through the first opening and the second connecting hole at the same time so that the two can rotate relative to each other.

[0022] A rod press is also provided, comprising: a middle shell having a first space therein, an expansion piece fixedly arranged on the middle shell; a connecting head relatively movably arranged in the first space along an extension direction and at least partially exposed outside the first space, the connecting head having elasticity for outward expansion, and an accommodation space arranged therein, the expansion piece at least partially extending into the accommodation space to push the expansion of the connecting head; when the middle shell moves to make the expansion piece located at a first position in the accommodation space of the connecting head, the connecting head is in an outward expansion state; when the expansion piece is located at other positions of the accommodation space, the connecting head is in a natural state; an outer shell having a second space therein, relatively movably arranged on the outer side of the middle shell and the connecting head along an extension direction and at least partially covering the connecting head, the front end of the outer shell also having elasticity for outward expansion, and when the connecting head is in an expanded state, the outer shell is pushed to expand outward. to provide space for connecting and accommodating some screws; when the connecting head changes from an expanded state to a natural state, the outer shell returns to its natural state to clamp the screw; a second notch is provided at the front end of the outer shell, and the front end of the middle shell and the second notch form a first channel, and when the middle shell moves in its extension direction, it will push the titanium rod to move along the first channel, and the forward movement will push the titanium rod to combine with the screw; a first handle is connected to the connecting head; a second handle is pivotally connected to the first handle and connected to the outer shell, and by rotating the second handle close to or away from the first handle, the outer shell is driven to move along its extension direction to adjust the distance between the screw and the titanium rod for easy combination; a third handle is pivotally connected to the first handle and connected to the middle shell, and by rotating the third handle close to or away from the first handle, the middle shell is driven to move along its extension direction to change the position of the expander to adjust the clamping state of the rod press and / or push the titanium rod to combine with the screw.

[0023] Compared with the prior art, this patent uses different handles to drive different parts to move relative to other parts, and changes the clamping state and the position of the titanium rod through movement. After clamping the screw to roughly determine the relative position of the screw and the titanium rod, the titanium rod is pushed toward the screw, and the screw is pulled toward the titanium rod to achieve the combination of the two. In the above process, it is only necessary to pull different handles to adjust in different situations, which can reduce human operation errors. While maintaining a stable connection, it reduces the time and energy consumed in the connection process, improves surgical efficiency, reduces surgical trauma, and shortens recovery time to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of a stick press in an embodiment of the present patent;

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the first handle in the embodiment of the present patent;

[0027] Figure 3 This is a schematic diagram of a partial three-dimensional structure of a stick press excluding the outer shell in an embodiment of the present patent;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of a stick press excluding the outer shell and the middle shell in the embodiment of the present patent;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure near the connecting head of the rod press in the embodiment of the present patent;

[0030] Figure 6 It is a partial three-dimensional structural schematic diagram of a stick press in the embodiment of the present patent;

[0031] Figure 7 It is a schematic diagram of a partial three-dimensional structure of the stick press except the outer shell in the embodiment of the present patent;

[0032] Figure 8 This is a schematic diagram of a partial three-dimensional structure from another angle of a stick press in an embodiment of this patent.

[0033] Reference numerals:

[0034] 1. First handle; 2. Second handle; 3. Third handle; 4. Handle portion; 5. Inner core portion; 6. First connection hole; 7. Second connection hole; 8. First movable hole; 9. Second movable hole; 10. First notch; 11. First movable pin; 12. Second movable pin; 13. Elastic member; 14. First hole; 15. Second hole; 16. First opening; 17. Second opening; 18. Shell; 19. Middle shell; 20. First protrusion; 21. First preset opening; 22. First connection module; 23. First corresponding hole ; 24. Second corresponding hole; 25. First through hole; 26. Second notch; 27. Gap; 28. Second protrusion; 29. ​​Second preset opening; 30. First positioning hole; 31. Second positioning hole; 32. Second connecting module; 33. Second through hole; 34. Third through hole; 35. Third movable hole; 36. First side wall; 37. Second side wall; 38. Notch; 39. Connector; 40. Base; 41. Support rod; 42. Pedicle screw; 43. Titanium rod; 44. Third movable pin; 45. Clamping groove. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of this patent clearer, the technical solution in the embodiments of this patent will be clearly and completely described below in conjunction with the drawings in the embodiments of this patent. Obviously, the described embodiments are part of the embodiments of this patent, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0036] In the description of the embodiments of this patent, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0037] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0038] To facilitate the understanding of the embodiments of this patent, the following will be further explained with specific embodiments in conjunction with the drawings. The embodiments do not constitute a limitation on the embodiments of this patent.

[0039] This embodiment provides a rod pressing method and a rod pressing device, such as Figures 1 to 8 shown.

[0040] The stick pressing method is implemented by a stick pressing device, which comprises a handle mechanism and a transmission mechanism connected in sequence.

[0041] The handle mechanism comprises a second handle 2, a first handle 1 and a third handle 3 which are connected in sequence.

[0042] like Figure 2 As shown, the first handle 1 includes a handle portion 4 and an inner core portion 5 .

[0043] The handle portion 4 is provided with a first connection hole 6 and a second connection hole 7, which are used to connect the second handle 2 to the first handle 1 respectively.

[0044] The inner core part 5 is cylindrical, and the side wall of the inner core part 5 is provided with a first moving hole 8, a second moving hole 9 and a first notch 10. The first moving hole 8 is in the shape of an elongated strip, and has the same extension direction as the inner core part 5. The first moving hole 8 is arranged through the opposite side wall of the inner core part 5, and its penetration direction is the first direction. The second moving hole 9 is located above the first moving hole 8. The second moving hole 9 is in the shape of an elongated strip, and has the same extension direction as the inner core part 5. Its arrangement is similar to the first moving hole 8, and is arranged through the opposite side wall of the inner core part 5 along the first direction, and the length of the second moving hole 9 in the extension direction is less than the length of the first moving hole 8 in the extension direction. The first notch 10 is located at the upper end of the inner core part 5, and the depth of the first notch 10 is toward the extension direction of the handle part 4. In addition, the first notch 10 is through along the first direction, and the distance between the upper part of the first notch 10 and the corresponding side wall is less than the distance between the lower part and the corresponding side wall.

[0045] The inner core part 5 is provided with a first moving pin 11, a second moving pin 12 and an elastic member 13 arranged along the extension direction of the inner core part 5, and the elastic member 13 connects the first moving pin 11 and the second moving pin 12. The first moving pin 11 is arranged in the second moving hole 9, and the second moving hole 9 provides a moving space for the first moving pin 11 in the extension direction of the inner core part 5. The second moving pin 12 is arranged in the first moving hole 8, and the first moving hole 8 provides a moving space for the second moving pin 12 in the extension direction of the inner core part 5.

[0046] The second handle 2 is provided with a first hole 14 and a second hole 15 which are arranged in vertical arrangement, and the first hole 14 is located above the second hole 15 .

[0047] The first hole 14 corresponds to the first connecting hole 6 , and a first pin is used to pass through the first connecting hole 6 and the first hole 14 at the same time, so that the first handle 1 and the second handle 2 rotate relative to each other with the first pin as the axis.

[0048] The third handle 3 is provided with a second opening 17 and a first opening 16 arranged in a vertical arrangement, and the second opening 17 is located above the first opening 16. The first opening 16 corresponds to the second connecting hole 7, and a second pin is used to simultaneously pass through the first opening 16 and the second connecting hole 7, so that the first handle 1 and the third handle 3 rotate relative to each other with the second pin as the axis. The second handle 2 and the third handle 3 are arranged opposite to each other, and are respectively located on both sides of the first handle 1.

[0049] like Figure 1 As shown, the transmission mechanism includes an outer shell 18 and a middle shell 19 .

[0050] The outer shell 18 is cylindrical and is arranged at the outermost layer of the stick press, and has a receiving space inside. The inner core part 5 of the first handle 1 at least partially extends into the receiving space, and the outer shell 18 is connected to the second handle 2. Specifically, the outer shell 18 covers the upper part of the inner core part 5, and after the two are connected, the outer shell 18 is higher than the inner core part 5 in the vertical direction, and the space where the outer shell 18 is higher than the inner core part 5 accommodates the connector 39.

[0051] The end of the shell 18 close to the second handle 2 is provided with a first protrusion 20 protruding from the side wall of the shell 18 and extending outward, and the first protrusion 20 is provided with a first preset opening 21. The shell 18 and the second handle 2 are connected through a first connecting module 22, the first connecting module 22 is in a strip shape, has a certain curvature, and is bent toward the axial direction of the rod press. When the two ends of the first connecting module 22 are on the same vertical line, the distance between the middle of the first connecting module 22 and the axis is greater than the distance between the two ends and the axis. The first connecting module 22 is provided with a first corresponding hole 23 and a second corresponding hole 24 arranged up and down, the first corresponding hole 23 is located above the second corresponding hole 24, the first corresponding hole 23 and the first preset opening 21 are opposite, allowing the third pin to pass through, and the first connecting module 22 and the first protrusion 20 are rotatably connected. The second corresponding hole 24 and the second hole 15 are opposite, both of which allow the fourth pin to pass through, and the first connecting module 22 and the second handle 2 are rotatably connected with the fourth pin as the center. Furthermore, the first connection module 22 includes a first connection member and a second connection member which are arranged in parallel. The first connection member and the second connection member are respectively arranged on both sides of the first protrusion 20 , and are also respectively arranged on both sides of the second handle 2 .

[0052] When the second handle 2 rotates from far away to close to the first handle 1, the second hole 15 moves downward relative to the initial position of the movement process, driving the first connecting module 22 and the housing 18 to move downward.

[0053] The shell 18 is also provided with a first through hole 25 and a second notch 26. The first through hole 25 is relatively arranged to penetrate along the first direction, and the first through hole 25 is opposite to the second movable hole 9, and the second movable hole 9 covers the area passed by the first through hole 25 during the movement. The first through hole 25 is adapted to the first movable pin 11, and no additional space is provided in the first through hole 25 for the first movable pin 11 to move, so that when the shell 18 moves up and down, the first movable pin 11 follows the movement, and the first movable pin 11 slides in the second movable hole 9 during the movement. In other words, when the shell 18 moves within a certain range, it will not cause the movement of the inner core part 5. The second notch 26 is located at the top position of the shell 18, and is relatively arranged on the side wall of the shell 18 to penetrate along the first direction, and its depth extends toward the direction where the handle mechanism is located. Figure 8 As shown, two opposite side walls forming the second notch 26 are provided with gaps 27 extending in the same direction as the housing 18 .

[0054] like Figure 3 As shown, the middle shell 19 is cylindrical and is arranged inside the outer shell 18, and a receiving space is arranged therein. The inner core part 5 of the first handle 1 at least partially extends into the receiving space of the middle shell 19, and the middle shell 19 is connected to the third handle 3. Specifically, the middle shell 19 at least partially extends into the outer shell 18 to the receiving space, and the outer shell 18 covers the upper part of the middle shell 19, and after the two are connected, the outer shell 18 is higher than the middle shell 19 in the vertical direction. The middle shell 19 covers the upper part of the inner core part 5, and after the two are connected, the middle shell 19 is higher than the inner core part 5 in the vertical direction.

[0055] The middle shell 19 is provided with a second protrusion 28 protruding from the middle shell 19 at one end close to the third handle 3, and a second preset opening 29 is provided on the second protrusion 28. The middle shell 19 and the third handle 3 are connected through a second connecting module 32, which is in a strip shape and is provided with a first positioning hole 30 and a second positioning hole 31 arranged up and down, the first positioning hole 30 is located above the second positioning hole 31, the first positioning hole 30 and the second preset opening 29 are opposite, and the fifth pin is allowed to pass through, so that the second connecting module 32 and the second protrusion 28 are rotatably connected. The second positioning hole 31 is rotatably connected to the first pin. Further, the second connecting module 32 includes a third connecting member and a fourth connecting member arranged in parallel, and the third connecting member and the fourth connecting member are respectively arranged on both sides of the second protrusion 28, and are also respectively arranged on both sides of the third handle 3.

[0056] When the third handle 3 moves and rotates from the far side toward the first handle 1 , the first opening 16 moves upward relative to the open position, and the middle shell 19 moves upward accordingly.

[0057] The middle shell 19 is also provided with a second through hole 33, a third through hole 34 and a third movable hole 35 which penetrate along the first direction. The second through hole 33 is provided on the side wall of the middle shell 19, and is located in an inner position above the second preset opening 29, and the inner position is a position close to the axis of the first handle 1. The second through hole 33 is opposite to the first movable hole 8, and the first movable hole 8 covers the area where the second through hole 33 is located. The second movable pin 12 passes through the first movable hole 8 and the second through hole 33 at the same time. Since the shape of the second through hole 33 is consistent with the outer edge of the second movable pin 12, there is no interference that can produce relative movement when the second movable pin 12 is inserted into the second through hole 33. When the middle shell 19 moves, the second movable pin 12 follows the movement and moves relatively in the first movable hole 8, without affecting the state of the outer shell 18. The third through hole 34 is located near the top of the middle shell 19 and exposed in the second notch 26. The third moving pin 44 passes through the third through hole 34. The outer edges of the third through hole 34 and the third moving pin 44 are consistent, so that the two are relatively fixed when connected. When the middle shell 19 moves, the third moving pin 44 is driven to move with it. The third moving pin 44 will be used as an expansion piece. The third moving hole 35 is located between the second through hole 33 and the third through hole 34. The third moving hole 35 is in a long strip shape. The third moving hole 35 corresponds to the first through hole 25 and the second moving hole 9. The area covered by the first through hole 25 overlaps with the area covered by the third moving hole 35, and the first through hole 25 is within the area covered by the third moving hole 35. When the outer shell 18 moves, the first moving pin 11 fixed relatively to the first through hole 25 will move in the third moving hole 35 without affecting the position and state of the middle shell 19. The length of the third moving hole 35 in its extension direction is greater than the length corresponding to the second moving hole 9.

[0058] like Figure 7 As shown, the front end of the middle shell 19 has a first side wall 36 and a second side wall 37 protruding from the extension direction and arranged opposite to each other to form a notch 38. The first side wall 36 and the second side wall 37 are evenly arranged at intervals, and both are at least partially covered by the third through hole 34. The upper edges of the first side wall 36 and the second side wall 37 are arc-shaped, and the upper end lengths of the first and second side walls are shorter than the lower end lengths in the cross section perpendicular to the first direction. Through the above arrangement, after the titanium rod 43 is placed horizontally, its side walls can be clamped at the arc-shaped edges of the first and second side walls, and the interval between the two side walls on the middle shell 19 provides freedom for the opening of the connector 39.

[0059] like Figure 4 and Figure 5As shown, the rod press also includes a connector 39, which includes a base 40 and two opposite support rods 41 arranged on the base 40. The base 40 has a hollow space, and its extension direction is the same as the extension direction of the accommodating space of the outer shell 18 and the middle shell 19. In the second direction, the length of the middle part of the base 40 is less than the length of the lower part of the base 40, the length of the lower part of the base 40 is less than the length of the upper part of the base 40, and the length of the upper part of the base 40 is equal to the length of the inner core part 5. The plane formed by the second direction and the first direction is perpendicular to the extension direction of the inner core part 5. The lower part of the base 40 is adapted to the lower part of the first notch 10, the middle part of the base 40 is adapted to the upper part of the first notch 10, and the upper part of the base 40 covers the upper part of the inner core part 5. Through the above arrangement, the inner core part 5 and the connector 39 are relatively fixedly plugged in, and when the inner core part 5 moves in its extension direction, the connector 39 will follow the movement. The length of the support rod 41 in the extension direction is greater than the depth of the second notch 26, so that part of the support rod 41 is hidden inside the housing 18; in the cross section perpendicular to the second direction, the width of the top of the support rod 41 is relatively narrow, and its width gradually increases as it extends toward the bottom, and the top of the support rod 41 is adapted to the gap 27 on the side wall of the housing 18 forming the second notch 26, and the support rod 41 at least partially covers the side wall forming the second notch 26. A groove is provided on the inner side of the support rod 41 to weaken the rigidity of the support rod 41 and facilitate the deformation of the support rod 41. A clamping groove 45 is provided on the top of the support rod 41, and the clamping grooves 45 on the two support rods 41 are arranged oppositely, and the grooves are recessed in the direction away from each other. The clamping groove 45 is used to clamp the nail cap of the screw. The distance between the two support rods 41 in the middle of the connector 39 is shorter than the distance between other positions, and the distance between the two support rods 41 in the middle of the connector 39 is smaller than the diameter of the third movable pin 44, and the distance between the two support rods 41 in other positions of the connector 39 is equal to the diameter of the third movable pin 44, so that when the third movable pin 44 is located in the middle of the connector 39, the two support rods 41 move away from each other to open the connector 39; when the third movable pin 44 moves to other positions, the two support rods 41 remain in a natural state. By moving the third movable pin 44, the distance between the two support rods 41 is changed, including when the third movable pin 44 is moved to the middle of the connector 39, the two support rods 41 gradually open, the distance between the two clamping grooves 45 becomes larger to clamp the nail cap, and after clamping, the third movable pin 44 is moved to other positions, the two support rods 41 return to the natural state, and the clamping groove 45 clamps the nail cap relatively.

[0060] Use the rod press to perform the following operations to achieve rod pressing:

[0061] When the second handle 2 is pulled away from the first handle 1 so that the distance between them is maximized, the first connecting module 22 is pushed to move upward, and the shell 18 moves upward accordingly. The third handle 3 is pulled away from the first handle 1 so that the distance between them is maximized, and the second connecting module 32 is pulled downward, thereby driving the middle shell 19 to move downward. The third movable pin 44 moves to the middle of the connecting head 39, and the distance between the two support rods 41 increases. The second notch 26 supporting the shell 18 expands to adapt to the pedicle screw 42, and the nail cap of the pedicle screw 42 is inserted into the clamping groove 45.

[0062] The third handle 3 is pressed down in the direction of the first handle 1 to shorten the distance between them, and the second connecting module 32 is driven to move upward, so that the third movable pin 44 moves upward. After the third movable pin 44 leaves the middle of the connecting head 39, the two support rods 41 become natural, and the distance between them is shortened. The shell 18 clamps the nail cap of the pedicle screw 42. The titanium rod 43 is placed in the remaining space of the second notch 26, that is, the space between the pedicle screw 42 and the top of the middle shell 19, and the third handle 3 is continued to be pressed toward the first handle 1. Under the push of the top of the middle shell 19, the titanium rod 43 is pressed toward the pedicle screw 42 to achieve pre-compression. The second handle 2 is pressed down in the direction of the first handle 1, and the first connecting module 22 drives the shell 18 and the pedicle screw 42 connected thereto downward, and connects with the titanium rod 43, and the titanium rod 43 is clamped into the pedicle screw 42. The third handle 3 and the second handle 2 are pulled apart to the farthest distance from the first handle 1 , and the assembled pedicle screw 42 and titanium rod 43 are separated from the rod presser.

[0063] The specific implementation methods described above further explain in detail the purpose, technical solutions and beneficial effects of this patent. It should be understood that the above description is only the specific implementation method of this patent and is not used to limit the scope of protection of this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

Claims

1. A rod pressing method, characterized in that: include: The stick pressing process is performed by pulling the handle of the stick pressing device, and the stick pressing device comprises: A middle shell, which has a first space therein, and an expansion piece is fixedly arranged on the middle shell; a connecting head, which is relatively movably arranged in the first space along the extension direction and at least partially exposed outside the first space, and the connecting head has elasticity to expand outward, and is provided with a receiving space therein, and the expansion piece at least partially extends into the receiving space to promote the expansion of the connecting head; an outer shell, which has a second space therein, is relatively movably arranged on the outer side of the middle shell and the connecting head along the extension direction, and at least partially covers the connecting head, and the front end of the outer shell also has elasticity to expand outward, and the front end of the outer shell is provided with a second notch, and the front end of the middle shell and the second notch form a first channel; a first handle, which is connected to the connecting head; a second handle, which is pivotally connected to the first handle and connected to the outer shell; a third handle, which is pivotally connected to the first handle and connected to the middle shell; The second handle and the third handle of the rod press are pulled to move the second handle and the third handle away from the first handle, the outer shell moves upward, the middle shell moves downward, the expansion piece moves to the first position with the middle shell, the connector is in an outward expansion state under the action of the expansion piece, and the expansion piece pushes the front end side wall of the outer shell to expand outward to provide space for connection and accommodating some screws; The third handle is pressed to move toward the direction close to the first handle, the expansion piece leaves the first position, the connector changes from expansion to natural state, the shell changes from lack of support force to natural state, the connector clamps the screw, and the middle shell moves upward to push the titanium rod placed on the upper edge of the middle shell to move along the first channel toward the direction close to the screw, thereby achieving pre-compression of the titanium rod and the screw; Pressing the second handle makes it move toward the direction close to the first handle, driving the shell to move downward, pulling the screw to move downward accordingly, and combining it with the screw to realize pressing the rod.

2. A rod pressing method according to claim 1, characterized in that: The connector includes a base and two opposing support rods arranged on the base, wherein the distance between the middle portions of the two support rods is smaller than the outer diameter of the expansion piece, and the distance between the two support rods at other positions is equal to the outer diameter of the expansion piece; When the expansion piece moves to the middle of the support rod, the two support rods will move relatively away from each other so that the diameter of the front end of the connector increases; when the expansion piece moves to other positions, the distance between the two support rods remains unchanged and is in a natural state.

3. The rod pressing method according to claim 2, characterized in that: The second notch at the front end of the housing is formed by the housing side walls that are opposite and spaced from each other, the housing side walls have a slit extending along the extension direction, and the top end of the support rod is adapted to the slit; When the connector expands, the top end of the support rod expands and is inserted into the gap, and the other parts of the support rod other than those corresponding to the gap at least partially cover the side wall of the shell forming the second notch. During the expansion of the connector, it abuts against the side wall of the shell and pushes the side wall of the shell to expand outward.

4. The rod pressing method according to claim 2, characterized in that: The front end of the middle shell is provided with a notch, which is formed by a first side wall and a second side wall spaced apart on the middle shell. The notch is adapted to the support rod, so that the support rod of the connector crosses the middle shell and abuts against the outer shell in an expanded state.

5. The rod pressing method according to claim 1, characterized in that: The second handle is provided with a first hole and a second hole, wherein the first hole is located above the second hole; The second handle is connected to the shell through a first connecting module, one end of the first connecting module is pivotally connected to the second hole, and the other end of the first connecting module is pivotally connected to the lower end of the shell.

6. The rod pressing method according to claim 5, characterized in that: A first protrusion is provided at a lower position of the housing, and a first preset opening is provided on the first protrusion; The first preset opening is opposite to the first corresponding opening on the other end of the first connecting module, and the third pin passes through the first preset opening and the first corresponding opening so that the two can be connected in a relatively rotatable manner.

7. The rod pressing method according to claim 1, characterized in that: The third handle is provided with a first opening and a second opening, wherein the first opening is located below the second opening; The third handle is connected to the middle shell via a second connecting module, one end of the second connecting module is pivotally connected to the second opening, and the other end of the second connecting module is pivotally connected to the lower end of the middle shell.

8. The rod pressing method according to claim 7, characterized in that: A second protrusion is provided at a lower position of the middle shell, and a second preset opening is provided on the second protrusion; The second preset opening corresponds to the first positioning opening on the other end of the second connecting module, and the sixth pin passes through the second preset opening and the first positioning hole so that the two can be connected in a relatively rotatable manner.

9. The rod pressing method according to claim 1, characterized in that: The first handle is provided with a first connecting hole and a second connecting hole; the first connecting hole corresponds to the first hole on the second handle, and the first pin passes through the first connecting hole and the first hole at the same time so that the two can rotate relative to each other; the second connecting hole corresponds to the first opening on the third handle, and the second pin passes through the first opening and the second connecting hole at the same time so that the two can rotate relative to each other.

10. A rod press, characterized in that: include: A middle shell having a first space therein, and an expansion piece is fixedly arranged on the middle shell; The connector is relatively movably arranged in the first space along the extension direction and at least partially exposed outside the first space. The connector has elasticity to expand outwards and is provided with a receiving space. The expansion piece at least partially extends into the receiving space to promote the expansion of the connector. When the middle shell moves to make the expansion piece located at a first position in the receiving space of the connector, the connector is in an outward expansion state; when the expansion piece is located at other positions of the receiving space, the connector is in a natural state. The outer shell has a second space therein, and is relatively movably sleeved on the outer side of the middle shell and the connecting head along the extension direction, and at least partially covers the connecting head. The front end of the outer shell also has elasticity to expand outward. When the connecting head is in an expanded state, the outer shell is pushed to expand outward to provide space for connection and accommodating some screws; when the connecting head changes from the expanded state to the natural state, the outer shell returns to the natural state to clamp the screws; the front end of the outer shell is provided with a second notch, and the front end of the middle shell and the second notch form a first channel. When the middle shell moves in its extension direction, it will push the titanium rod to move along the first channel, and the forward movement will push the titanium rod to combine with the screw; A first handle, connected to the connector; The second handle is pivotally connected to the first handle and connected to the housing. By rotating the second handle to move closer to or away from the first handle, the housing is driven to move along its extension direction to adjust the distance between the screw and the titanium rod for easy combination; The third handle is pivotally connected to the first handle and connected to the middle shell. By rotating the third handle closer to or away from the first handle, the middle shell is driven to move along its extension direction to change the position of the expansion piece, adjust the clamping state of the rod press and / or push the titanium rod to combine with the screw.

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