A method of and a bar presser

Abstract

The patent belongs to the field of medical devices, and particularly relates to a titanium rod pressing method and a titanium rod presser, which comprises a middle shell with a first space in it, a dilatation part fixedly arranged on the middle shell, a connecting head with elasticity outwardly dilated and with a containing space in it, the dilatation part at least partially extending into the containing space to push the dilation of the connecting head, an outer shell with a second space in it, movably sleeved on the outside of the middle shell and the connecting head along the extending direction, and at least partially covering the connecting head, the front end of the outer shell also having elasticity outwardly dilated, the front end of the outer shell being provided with a second slot, the front end of the middle shell and the second slot forming a first channel, the front movement of the middle shell pushing the combination of the titanium rod and the screw, a first handle connected with the connecting head, a second handle pivotally connected with the first handle and connected with the outer shell, and a third handle pivotally connected with the first handle and connected with the middle shell. The second handle and the third handle are pulled apart and pressed down to realize the guarantee of stability and the improvement of the efficiency of the titanium rod pressing.

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 small size of the screw plug in the traditional posterior nail-rod fixation structure makes installation difficult and requires a considerable amount of time and effort. In addition, the large size of the screw seat can interfere with and damage the soft tissues of the human body, thus prolonging the patient's recovery period. In the existing technology, the screw needs to be screwed into the corresponding bone position, and the curvature of the titanium rod needs to be adjusted to fit the bone before it is combined with the screw. However, due to the limited space in the body, manual alignment and combination of the titanium rod and the screw is relatively 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 that 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 press, and the rod press 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, which is relatively movably arranged on the outside 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 is provided with a second notch at the front end of the outer shell, 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; the second handle is pivotally connected to the first handle and is connected to the outer shell; the 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 so that 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 connection and accommodation of 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 lacks supporting force and changes to a natural state, 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-compression 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, and pull the screw to move downward accordingly, so that it combines with the screw to realize rod pressing.

[0007] With the above arrangement, the clamping end (the connector and the front end of the housing) 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. Positioning is achieved through clamping, and the titanium rod is pushed toward the screw position through the middle housing, and the screw is pulled toward the titanium rod, completing the connection. This arrangement ensures connection accuracy and ease of operation.

[0008] The connector includes a base and two opposing support rods arranged on the base. The distance between the middle parts of the two support rods is less 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 rods, the two support rods will be relatively separated so that the diameter of the front end of the connector 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 to and spaced from each other. The shell 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 is expanded and inserted into the slit, and the other parts of the support rod other than those corresponding to the slit are at least partially covered on the shell side walls forming the second notch. During the expansion process of the connector, it abuts against the shell side walls and pushes the shell side walls to expand outward.

[0011] The above-mentioned specific structure enables the front end of the housing to expand under the drive of the connector.

[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 the 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, which makes it convenient to adjust the required state of the shell 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 upward relatively, and when the third handle moves away from the first handle, the outer shell moves downward, which facilitates adjusting the required state of the middle shell 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] The invention also provides a rod press, comprising: a middle shell having a first space therein, an expansion piece fixedly arranged on the middle shell; a connecting head arranged in the first space relatively movably along the extension direction and at least partially exposed outside the first space, the connecting head having elasticity to expand outwards, and a receiving space provided therein, the expansion piece at least partially extending into the receiving space to push the expansion of the connecting head; when the middle shell moves so that the expansion piece is located in a first position in the receiving space of the connecting head, the connecting head is in an outward expansion state; when the expansion piece is located in other positions of the receiving space, the connecting head is in a natural state; an outer shell having a second space therein, which is relatively movably arranged on the outside 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 having elasticity to expand outwards, and when the connecting head is in the expanded state, it pushes the outer shell to expand outwards. To provide space for connection and accommodating some screws; when the connecting head changes from an expanded state to a natural state, the shell returns to its natural state to clamp the screw; a second notch is provided at the front end of the 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; the second handle is pivotally connected to the first handle and connected to the shell, and by rotating the second handle close to or away from the first handle, the shell 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, 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 existing technology, this patent uses different handles to drive different components to move relative to other components, and realizes the change of clamping state and the position of titanium rod through movement. After clamping the screw to roughly determine the relative position of the screw and titanium rod, the titanium rod is pushed toward the screw, and the screw is pulled toward the titanium rod to achieve the connection between the two. In the above process, it is only necessary to pull different handles to adjust in different situations, thereby reducing human operation errors. While maintaining a stable connection, the time and energy consumed in the connection process are reduced, the surgical efficiency is improved, the surgical trauma is reduced, and the recovery time is shortened 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 this patent;

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

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

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

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

[0030] Figure 6 This is a partial three-dimensional structural diagram of a stick press in an embodiment of this patent;

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

[0032] Figure 8 This is a schematic diagram of a partial three-dimensional structure from another angle of a rod 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 connecting hole; 7. Second connecting 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. Outer shell; 19. Middle shell; 20. First protrusion; 21. First preset opening; 22. First connecting 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] To make the purpose, technical solutions, and advantages of the embodiments of this patent more clear, the technical solutions 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 embodiments described 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 making creative efforts 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 expressly specified or 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. It can be 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 meaning of the above terms in this patent can be understood according to the specific circumstances.

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

[0038] To facilitate understanding of the embodiments of this patent, the following will be further explained with specific embodiments in conjunction with the accompanying 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 realized by a stick pressing device, which includes a handle mechanism and a transmission mechanism connected in sequence.

[0041] The handle mechanism includes 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 portion 5 is cylindrical, and the sidewalls of the inner core portion 5 are provided with a first movable hole 8, a second movable hole 9, and a first notch 10. The first movable hole 8 is elongated and extends in the same direction as the inner core portion 5. The first movable hole 8 is provided through the opposite sidewalls of the inner core portion 5, and its direction of penetration is the first direction. The second movable hole 9 is located above the first movable hole 8. The second movable hole 9 is elongated and extends in the same direction as the inner core portion 5. Similar to the first movable hole 8, it is provided through the opposite sidewalls of the inner core portion 5 along the first direction, and its extension length is shorter than that of the first movable hole 8. The first notch 10 is located at the upper end of the inner core portion 5. The depth of the first notch 10 is oriented in the extension direction of the handle portion 4. In addition, the first notch 10 extends in the first direction, and the distance between the upper portion of the first notch 10 and the corresponding sidewall is shorter than the distance between the lower portion and the corresponding sidewall.

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

[0046] The second handle 2 is provided with a first hole 14 and a second hole 15 arranged in an upper and lower 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 vertically. The second opening 17 is located above the first opening 16. The first opening 16 corresponds to the second connecting hole 7. A second pin is inserted through both the first opening 16 and the second connecting hole 7, allowing the first handle 1 and the third handle 3 to rotate relative to each other about the second pin. The second handle 2 and the third handle 3 are arranged opposite each other, one on each side 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 disposed at the outermost layer of the stick press. It has an internal storage space, into which the inner core 5 of the first handle 1 at least partially extends. The outer shell 18 is connected to the second handle 2. Specifically, the outer shell 18 covers the upper portion of the inner core 5. When the two are connected, the outer shell 18 is higher than the inner core 5 in the vertical direction. The space where the outer shell 18 is higher than the inner core 5 accommodates the connector 39.

[0051] The end of the housing 18 near the second handle 2 is provided with a first protrusion 20 extending outward from the sidewall of the housing 18. The first protrusion 20 is provided with a first predetermined opening 21. The housing 18 and the second handle 2 are connected by a first connecting module 22. The first connecting module 22 is strip-shaped and has a certain curvature, bending toward the axial direction of the rod press. When the two ends of the first connecting module 22 are aligned 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. The first connecting module 22 is provided with a first corresponding hole 23 and a second corresponding hole 24 arranged in a vertical arrangement. The first corresponding hole 23 is located above the second corresponding hole 24. The first corresponding hole 23 and the first predetermined opening 21 are opposite to each other, 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 to each other, both of which allow the fourth pin to pass through, and the first connecting module 22 and the second handle 2 are rotatably connected around the fourth pin. Furthermore, the first connecting module 22 includes a first connecting member and a second connecting member arranged in parallel. The first connecting member and the second connecting 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 a far position toward 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 set 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 the first through hole 25 does not provide additional space for the movement of the first movable pin 11, 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. That is to say, 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 set on the side wall of the shell 18 penetrating along the first direction, and its depth extends toward the direction where the handle mechanism is located. As 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 disposed within the outer shell 18. A storage space is defined therein. The inner core 5 of the first handle 1 at least partially extends into the storage space of the middle shell 19. The middle shell 19 is connected to the third handle 3. Specifically, the middle shell 19 at least partially extends into the storage space of the outer shell 18, and the outer shell 18 covers the upper portion of the middle shell 19. When the outer shell 18 and the outer shell 18 are connected, the outer shell 18 is vertically higher than the middle shell 19. The middle shell 19 covers the upper portion of the inner core 5. When the outer shell 18 and the outer shell 18 are connected, the middle shell 19 is vertically higher than the inner core 5.

[0055] A second protrusion 28 protruding from the middle shell 19 is provided at one end of the middle shell 19 near the third handle 3. A second predetermined opening 29 is provided on the second protrusion 28. The middle shell 19 and the third handle 3 are connected via a second connecting module 32. The second connecting module 32 is strip-shaped and has a first positioning hole 30 and a second positioning hole 31 arranged vertically thereon. The first positioning hole 30 is located above the second positioning hole 31. The first positioning hole 30 and the second predetermined opening 29 are opposite each other and allow a fifth pin to pass through, thereby rotatably connecting the second connecting module 32 and the second protrusion 28. The second positioning hole 31 is rotatably connected to the first pin. Furthermore, the second connecting module 32 includes a third connecting member and a fourth connecting member arranged in parallel. The third connecting member and the fourth connecting member are respectively provided on either side of the second protrusion 28 and, similarly, on either side 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 extending 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. A third movable pin 44 passes through the third through-hole 34. The outer edges of the third through-hole 34 and the third movable pin 44 coincide, ensuring a relatively fixed connection between the two. When the middle shell 19 moves, the third movable pin 44 moves with it, acting as an expansion member. The third movable hole 35 is located between the second through-hole 33 and the third through-hole 34. The third movable hole 35 is elongated and corresponds to the first through-hole 25 and the second movable hole 9. The area covered by the first through-hole 25 overlaps with the area covered by the third movable hole 35, and the first through-hole 25 is within the area covered by the third movable hole 35. When the outer shell 18 moves, the first movable pin 11, which is fixed relative to the first through-hole 25, moves within the third movable hole 35 without affecting the position and state of the middle shell 19. The length of the third movable hole 35 along its extension direction is greater than the corresponding length of the second movable 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 that protrude in the extension direction and are arranged opposite each other to form a notch 38. The first side wall 36 and the second side wall 37 are evenly spaced and both are at least partially covered by the third through hole 34. The upper edges of the first and second side walls 36 and 37 are curved, and in a cross-section perpendicular to the first direction, the upper ends of the first and second side walls are shorter than the lower ends. This arrangement allows the titanium rod 43 to be placed horizontally, with its side walls snapping onto the curved edges of the first and second side walls. The spacing between the upper and lower side walls of the middle shell 19 provides freedom for the connector 39 to open.

[0059] like Figure 4 and Figure 5As shown, the rod press also includes a connector 39, which includes a base 40 and two opposing support rods 41 disposed on the base 40. The base 40 has a hollow space, and its extension direction is the same as the extension direction of the accommodation space of the outer shell 18 and the middle shell 19. In the second direction, the length of the middle portion of the base 40 is less than the length of the lower portion of the base 40, the length of the lower portion of the base 40 is less than the length of the upper portion of the base 40, and the length of the upper portion of the base 40 is equal to the length of the inner core portion 5. The plane formed by the second direction and the first direction is perpendicular to the extension direction of the inner core portion 5. The lower portion of the base 40 is adapted to the lower portion of the first notch 10, the middle portion of the base 40 is adapted to the upper portion of the first notch 10, and the upper portion of the base 40 covers the upper portion of the inner core portion 5. Through the above arrangement, the inner core portion 5 and the connector 39 are relatively fixedly connected, and when the inner core portion 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. 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 deformation of the support rod 41. A clamping groove 45 is provided at the top of the support rod 41. The clamping grooves 45 on the two support rods 41 are arranged opposite to each other, and the grooves are recessed in a 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 them at other locations. The distance between the two support rods 41 in the middle of the connector 39 is less than the diameter of the third movable pin 44. The distance between the two support rods 41 at other locations of the connector 39 is equal to the diameter of the third movable pin 44. This means that when the third movable pin 44 is 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 is moved to other locations, the two support rods 41 remain in their natural state. The distance between the two support rods 41 is changed by moving the third movable pin 44. This includes moving the third movable pin 44 toward the middle of the connector 39, which gradually opens the two support rods 41 and increases the distance between the two clamping grooves 45 to accommodate the nail cap. After clamping, the third movable pin 44 is moved to another location, and the two support rods 41 return to their natural state, with the clamping grooves 45 clamping the nail cap relative to each other.

[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 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, pulling the second connecting module 32 downward, thereby driving the middle shell 19 to move downward, and the third movable pin 44 moves to the middle of the connecting head 39. The distance between the two support rods 41 increases, and the second notch 26 supporting the shell 18 expands to adapt to the pedicle screw 42. The nail cap of the pedicle screw 42 is inserted into the clamping groove 45.

[0062] Press the third handle 3 toward the first handle 1 to shorten the distance between them, driving the second connecting module 32 upward, causing the third movable pin 44 to move upward. After the third movable pin 44 leaves the middle of the connector 39, the two support rods 41 return to a natural state, shortening the distance between them. The housing 18 clamps the cap of the pedicle screw 42. Place the titanium rod 43 into the remaining space in the second notch 26, that is, the space between the pedicle screw 42 and the top of the middle housing 19. Continue to press the third handle 3 toward the first handle 1. Pushed by the top of the middle housing 19, the titanium rod 43 presses against the pedicle screw 42 to achieve preload. Press the second handle 2 toward the first handle 1. The first connecting module 22 drives the housing 18 and the pedicle screw 42 connected thereto downward, connecting them to the titanium rod 43 and inserting the titanium rod 43 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 intended 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 press, characterized in that: include: a middle shell having a first space therein and an expansion member fixedly disposed on the middle shell; The connector is relatively movably disposed in the first space along the extension direction and at least partially exposed outside the first space. The connector has elasticity to expand outward and has an accommodation space disposed therein. The expansion member at least partially extends into the accommodation space to promote expansion of the connector. When the intermediate shell moves so that the expansion member is located in a first position in the connector accommodation space, the connector is in an outwardly expanded state; when the expansion member is located in other positions in the accommodation space, the connector is in a natural state. The outer shell has a second space therein and is relatively movably arranged on the outside 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. When the connecting head is in an expanded state, it pushes the outer shell 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 pushes the titanium rod to move along the first channel, and the movement pushes the titanium rod to engage with the screw; The first handle is connected to the connector; The second handle is pivotally connected to the first handle and is connected to the housing. By rotating the second handle 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 engagement; The third handle is pivotally connected to the first handle and is 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 expander, adjust the clamping state of the rod press and / or push the titanium rod to combine with the screw.

2. The stick press 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 less 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 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 stick press 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 apart from each other, the housing side walls having a slit extending along the extension direction, the top end of the support rod being 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 outside the gap at least partially cover the side wall of the shell forming the second slot. During the expansion process 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 stick press 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 the expanded state.

5. The stick press 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 stick press 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 stick press 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 stick press 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 stick press according to claim 1, characterized in that: 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.

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