Auxiliary device for fixing connecting rod

Abstract

The present invention discloses an auxiliary device for fixing a connecting rod, and relates to the technical field of medical devices. The auxiliary device for fixing the connecting rod comprises an outer sleeve, an inner sleeve, and an elastic member. The lower end of the outer sleeve is provided with a first bayonet; the lower end of the inner sleeve is provided with a second bayonet, and one side of the second bayonet is provided with a clamping section. The present invention can block the first bayonet of the outer sleeve through the clamping section of the inner sleeve, confine the connecting rod in the first bayonet, and prevent the first bayonet of the outer sleeve from coming out of the connecting rod when the screw plug is locked, thereby eliminating the shortcoming of the traditional auxiliary device for fixing the connecting rod that the connecting rod comes out when resisting the locking torque of the screw plug wrench, ensuring that the operation of the locking screw plug during surgery is safer and more reliable; the elasticity of the elastic member is used to make the inner sleeve automatically return to its original position after rotating to open the first bayonet, so that the second bayonet automatically closes the first bayonet, which is convenient for fixing the connecting rod, and makes the first bayonet and the second bayonet more reliable in restricting the connecting rod.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to an auxiliary device for fixing a connecting rod. Background Art

[0002] Posterior thoracic and lumbar transpedicular screw fixation is the most widely used internal fixation technique in spinal surgery. This fixation system, consisting of pedicle screws and connecting rods, offers significant biomechanical advantages, is technically mature, and has been widely used clinically. The connecting rods are typically made of stainless steel or titanium alloy.

[0003] During posterior thoracic and lumbar screw-rod fixation surgery, a connecting rod is inserted into the U-shaped groove at the end of the pedicle screw. The threads of the screw plug mate with those of the U-shaped groove at the end of the pedicle screw to lock the connecting rod, creating a stable fixation structure. The screw plug-locking and connecting rod-locking operation requires a screw plug locking wrench and a device for temporarily securing the connecting rod. This device, in conjunction with the connecting rod, counteracts the rotational force of the screw plug during tightening, preventing the rotational force from being transmitted through the pedicle screw to the patient's body and potentially disrupting the surgical reduction.

[0004] Currently, the auxiliary device commonly used in clinical practice to secure the connecting rod consists of a jacket and a handle, which are often assembled by welding. The jacket has a U-shaped opening on the lower edge. During the screw tightening process, the auxiliary device temporarily securing the connecting rod resists the tightening torque, which creates a risk of the connecting rod slipping out of the U-shaped opening. If this happens, the tightening torque of the screw wrench will be instantly transmitted to the patient's body, which could damage the patient's vertebral reduction and delay the surgery at best, or cause neurological damage and lead to surgical failure at worst. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an auxiliary device for fixing a connecting rod, so as to solve the problem that the connecting rod is easily separated from the outer casing during the fixing process of the connecting rod in the existing device.

[0006] An auxiliary device for fixing a connecting rod, comprising:

[0007] A jacket, wherein the lower end of the jacket is provided with two symmetrical first bayonet holes, and the lower ends of the first bayonet holes are provided with a first opening;

[0008] an inner sleeve rotatably disposed within the outer sleeve, wherein the lower end of the inner sleeve is provided with two symmetrical second bayonet holes, wherein the circumferential length of the second bayonet holes is greater than the circumferential length of the first bayonet holes, and a second opening is provided at the lower end of the second bayonet holes, wherein the circumferential length of the second opening is less than the circumferential length of the second bayonet holes, and a limiting section is provided on one side of the second opening, wherein the limiting section is capable of limiting downward movement of the connecting rod;

[0009] An elastic member connects the outer sleeve and the inner sleeve and is capable of driving the inner sleeve to rotate so that the limiting section is opposite to the first opening.

[0010] Preferably, in the above technical solution, the first bayonet is U-shaped, and the distance between the two parallel side walls of the first bayonet is equal to the diameter of the connecting rod.

[0011] The above technical solution is preferred, in which an outwardly protruding mounting portion is provided on the side wall of the outer sleeve, and a mounting groove is provided in the mounting portion for placing the elastic member, and a protrusion is provided on the inner sleeve, and the protrusion extends into the mounting groove, one end of the elastic member abuts against the inner wall of the mounting groove, and the other end abuts against the protrusion, and the elastic member applies an elastic force along the circumference of the outer sleeve to the protrusion, which can make the second opening on the inner sleeve move away from the first opening along the circumference of the outer sleeve, and make the limiting section opposite to the first opening.

[0012] Preferably, the above technical solution is that the elastic member is a spring.

[0013] Preferably, the above technical solution is that the mounting groove is a groove arranged along the circumference of the outer sleeve.

[0014] Preferably, the upper end of the mounting portion is an open structure, and a cover plate is connected to the upper opening of the mounting portion to limit the protrusion and the spring from falling out of the upper end of the mounting portion.

[0015] Preferably, the above technical solution is provided with a handle connected to the outer jacket.

[0016] Preferably, the length direction of the handle is perpendicular to the axial direction of the outer sleeve.

[0017] Preferably, the above technical solution is such that the upper end of the inner sleeve extends out of the outer sleeve, and a rotary handle is provided at the upper end of the inner sleeve.

[0018] Preferably, the outer diameter of the inner sleeve is equal to the inner diameter of the outer sleeve.

[0019] The advantages and positive effects of the present invention are as follows: the present invention provides an auxiliary device for fixing a connecting rod, comprising an outer sleeve, an inner sleeve and an elastic member, which structurally provides a design for preventing the rod from being dislodged. The inner sleeve is rotated so that the limiting section of the second bayonet of the inner sleeve cooperates with the first bayonet. The limiting section of the inner sleeve can block the first bayonet of the outer sleeve, limiting the connecting rod in the first bayonet, preventing the first bayonet of the outer sleeve from being dislodged from the connecting rod when the screw plug is locked, thereby eliminating the disadvantage of the traditional auxiliary device for fixing the connecting rod that the connecting rod is dislodged when resisting the locking torque of the screw plug wrench, ensuring that the operation of the locking screw plug during surgery is safer and more reliable; the elasticity of the elastic member is utilized to enable the inner sleeve to automatically return to its original position after rotating to open the first bayonet, so that the limiting section automatically closes the first bayonet, facilitating the fixing of the connecting rod, and making the restriction of the connecting rod by the first bayonet and the second bayonet more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic structural diagram of an auxiliary device for fixing a connecting rod provided by one embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Exploded diagram;

[0022] Figure 3 is a top view of an auxiliary device for fixing a connecting rod provided by one embodiment of the present invention;

[0023] Figure 4 yes Figure 3 AA section view;

[0024] Figure 5 yes Figure 4 BB cross-sectional view;

[0025] Figure 6 yes Figure 5 A partial enlarged view of point C in the middle;

[0026] Figure 7 1 is a schematic diagram of a closed state of an auxiliary device for fixing a connecting rod provided by an embodiment of the present invention;

[0027] Figure 8 1 is a schematic diagram of an auxiliary device for fixing a connecting rod provided by an embodiment of the present invention in an open state.

[0028] Among them: 1. outer sleeve; 2. inner sleeve; 3. cover plate; 4. rotary handle; 5. handle; 6. spring; 7. connecting rod; 11. first bayonet; 12. mounting portion; 121. mounting groove; 21. second bayonet; 211. limiting section; 22. protrusion. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] like Figure 1-8As shown, this embodiment provides an auxiliary device for securing a connecting rod. This device is used to temporarily secure the connecting rod and apply a rotational force to it while the connecting rod is being secured with a screw plug, preventing rotation of the connecting rod from affecting the patient. The auxiliary device for securing a connecting rod comprises an outer sleeve 1, an inner sleeve 2, and an elastic member. The lower end of the outer sleeve 1 is provided with two symmetrical first retaining notches 11, each with a first opening at its lower end. The inner sleeve 2 is rotatably mounted within the outer sleeve 1. The lower end of the inner sleeve 2 is provided with two symmetrical second retaining notches 21. The circumferential length of the second retaining notches 21 is greater than that of the first retaining notches 11. The lower end of the second retaining notches 21 is provided with a second opening, which is less than the circumferential length of the second retaining notches 21. A stopper 211 is provided on one side of the second opening to limit downward movement of the connecting rod 7. The elastic member connects the outer sleeve 1 and the inner sleeve 2 and can drive the inner sleeve 2 to rotate so that the stopper 211 faces the first opening. Specifically, the two first bayonet holes 11 are symmetrically arranged about the axis of the outer sleeve 1 , and the two second bayonet holes 21 are symmetrically arranged about the axis of the inner sleeve 2 .

[0034] During use, the auxiliary device for fixing the connecting rod rotates the inner sleeve 2 and the outer sleeve 1 relative to each other under the action of external force and compresses the elastic member, so that the limit section 211 is away from the first opening and the first opening and the second opening are opposite to each other. The first bayonet 11 and the second bayonet 21 of the auxiliary device are simultaneously clamped on the connecting rod 7, and the external force is released. Under the action of the elastic member, the inner sleeve 2 and the outer sleeve 1 rotate relative to each other in opposite directions, and the limit section 211 is opposite to the first opening. The limit section 211 can limit the connecting rod 7 from falling out of the first opening. Therefore, the auxiliary device for fixing the connecting rod can ensure that the connecting rod 7 is stable and reliable when the screw plug fixes the connecting rod 7, and the problem of the connecting rod 7 falling out is not easy to occur.

[0035] The first bayonet 11 is U-shaped, including two parallel side walls and a semicircular connecting wall, wherein the two ends of the connecting wall are tangent to the two parallel side walls respectively, wherein the diameter of the connecting wall is equal to the diameter of the connecting rod 7, and the distance between the two side walls of the first bayonet 11 is equal to the diameter of the connecting rod 7.

[0036] The second bayonet 21 is opened along the circumference of the inner sleeve 2 . One end of the second bayonet 21 having a limiting section 211 and the connection between the limiting section 211 are in an arc shape, and the curvature radius of the arc is the same as that of the connecting rod 7 .

[0037] The sidewall of the outer sleeve 1 is provided with an outwardly protruding mounting portion 12, specifically disposed on the sidewall at the top of the outer sleeve 1. A mounting groove 121 is defined within the mounting portion 12 for accommodating an elastic member. A protrusion 22 is provided on the inner sleeve 2, which extends into the mounting groove 121. One end of the elastic member abuts against the inner wall of the mounting groove 121, while the other end abuts against the protrusion 22. The elastic member applies a circumferential elastic force to the protrusion 22, which causes the second opening of the inner sleeve 2 to move away from the first opening along the circumference of the outer sleeve 1. The mounting groove 121 is a groove disposed circumferentially along the outer sleeve 1. The protrusion 22 is movable within the mounting groove 121 and can compress the elastic member. In this embodiment, the mounting groove 121 is in the shape of a quarter of a circle. After the connecting rod 7 is located in the first bayonet 11 and the second bayonet 21, the external force is removed and the elasticity of the elastic member is used to rotate the inner sleeve 2 relative to the outer sleeve 1. When one end of the connection limit section 211 is against the connecting rod 7, the limit section 211 is opposite to the first opening, which can limit the connecting rod 7 from being separated from the first opening. This process is completed automatically, which simplifies the operation and saves surgical time.

[0038] Based on the structural dimensions of the first and second bayonet holes 11 and 21, it can be seen that when the auxiliary device is clamped to the connecting rod 7, the connecting rod 7 will not wobble or move within the auxiliary device, ensuring the stability of the connecting rod 7 during surgery and facilitating a smooth surgical procedure. In this embodiment, the specific shapes and dimensions of the first and second bayonet holes 11 and 21 can also be adapted to changes in the external shape of the connecting rod 7.

[0039] In order to fit the protrusion 22 of the inner sleeve 2 into the mounting groove 121, the upper end of the mounting portion 12 is an open structure, which enables the protrusion 22 to fit into the mounting groove 121 when the inner sleeve 2 is inserted into the outer sleeve 1 from the top end. In order to prevent the protrusion 22 and the spring 6 from falling out at the upper end of the mounting portion 12, a cover plate 3 is connected to the upper end opening of the mounting portion 12. Specifically, the cover plate 3 is welded to the upper end of the outer sleeve 1. The cover plate 3 includes a collar and a convex plate, wherein the convex plate covers the upper end opening of the mounting portion 12, and the shape of the convex plate is adapted to the outer shape of the upper end of the mounting portion 12. The collar is welded to the other parts of the top end of the outer sleeve 1, and the inner diameter of the collar is the same as the outer diameter of the outer sleeve 1.

[0040] In this embodiment, the elastic member is a spring 6. In other embodiments, the elastic member can also be an elastic element in other forms.

[0041] In this embodiment, in order to facilitate hand-holding of the auxiliary device, a handle 5 is connected to the jacket 1. Specifically, the handle 5 is arranged below the mounting portion 12 and near the top end of the jacket 1, which can prevent the handle 5 from being too close to the human body and interfering with the human body.

[0042] In this embodiment, the length direction of the handle 5 is perpendicular to the axial direction of the outer sleeve 1 . Specifically, the length direction of the handle 5 is perpendicular to the length direction of the fixed connecting rod 7 .

[0043] In this embodiment, the upper end of the inner sleeve 2 extends beyond the top of the outer sleeve 1. A handle 4 is provided at the top of the inner sleeve 2. The handle 4 has a diameter larger than that of the outer sleeve 1, facilitating relative movement between the inner sleeve 2 and the outer sleeve 1. Furthermore, the outer surface of the handle 4 is provided with anti-slip stripes to prevent slipping. The inner sleeve 2 and the handle 45 are connected by welding or a clamping connection.

[0044] The outer diameter of the inner sleeve 2 is equal to the inner diameter of the outer sleeve 1, which can ensure effective cooperation between the inner sleeve 2 and the outer sleeve 1, avoid other relative movements between the inner sleeve 2 and the outer sleeve 1 except relative rotation, thereby avoiding the movement of the connecting rod 7 and ensuring the effect of fixing the connecting rod 7 by the screw plug.

[0045] The assembly process of the auxiliary device for fixing the connecting rod in this embodiment is as follows: the outer sleeve 1 is welded and assembled with the handle 5; the inner sleeve 2 is inserted into the outer sleeve 1 from the top end of the outer sleeve 1, so that the protrusion 22 on the outer wall of the inner sleeve 2 is installed in the installation groove 121 of the outer sleeve 1; the spring 6 is installed into the installation groove 121, so that one end is against the inner wall of the installation groove 121 and the other end is against the protrusion 22, and when the protrusion 22 compresses the spring 6 under the action of external force, the second opening of the second bayonet 21 moves toward the first opening, and after the external force is withdrawn, the inner sleeve 2 rotates in the opposite direction, so that the second opening moves away from the first opening and the limiting section 211 approaches the first opening; the cover plate 3 is passed through the inner sleeve 2 to cover the end face of the outer sleeve 1 and welded and assembled; the rotary handle 45 is welded and assembled to the inner sleeve 2.

[0046] The auxiliary device for fixing the connecting rod in this embodiment is used as follows: before use, the limiting section 211 provided on the inner sleeve 2 is opposite to the first opening of the outer sleeve 1, and the auxiliary device cannot be stuck on the connecting rod 7. By rotating the handle 45, the protrusion 22 on the outer wall of the inner sleeve 2 can be driven to compress the spring 6. Figure 8 As shown, the second opening on the inner sleeve 2 is aligned with the first opening on the outer sleeve 1 so that the connecting rod 7 can enter the first bayonet 11 of the outer sleeve 1. Then, after the handle 45 is loosened, the spring 6 pushes the protrusion 22 on the outer wall of the inner sleeve 2 to move in the opposite direction, so that the inner sleeve 2 rotates in the opposite direction relative to the outer sleeve 1, as shown in FIG. Figure 7 As shown, the limiting section 211 of the inner sleeve 2 will be opposite to the first opening of the outer sleeve 1, thereby confining the connecting rod 7 in the first bayonet 11 of the outer sleeve 1. The operator holds the handle 5 to fix the connecting rod 7 to facilitate the locking of the screw plug. After the screw plug locks the connecting rod 7, the operator first removes the screw plug wrench and then manually rotates the handle 45 so that the protrusion 22 on the outer wall of the inner sleeve 2 compresses the spring 6 again, thereby opening the first bayonet 11 of the outer sleeve 1 and the connecting rod 7, and the auxiliary device is removed from the connecting rod 7.

[0047] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An auxiliary device for fixing a connecting rod, characterized in that: include: A jacket (1), wherein the lower end of the jacket (1) is provided with two symmetrical first bayonet holes (11), and the lower end of the first bayonet holes (11) is provided with a first opening; An inner sleeve (2) is rotatably arranged inside the outer sleeve (1); the lower end of the inner sleeve (2) is provided with two symmetrical second bayonet holes (21); the circumferential length of the second bayonet holes (21) is greater than the circumferential length of the first bayonet holes (11); the lower end of the second bayonet holes (21) is provided with a second opening; the circumferential length of the second opening is less than the circumferential length of the second bayonet holes (21); a limiting section (211) is provided on one side of the second opening; the limiting section (211) is capable of limiting the downward movement of the connecting rod (7); an elastic member connecting the outer sleeve (1) and the inner sleeve (2) and capable of driving the inner sleeve (2) to rotate so that the limiting section (211) is opposite to the first opening; An outwardly protruding mounting portion (12) is provided on the side wall of the outer sleeve (1), and a mounting groove (121) is provided in the mounting portion (12) for placing the elastic member. A protrusion (22) is provided on the inner sleeve (2), and the protrusion (22) extends into the mounting groove (121). One end of the elastic member abuts against the inner wall of the mounting groove (121), and the other end abuts against the protrusion (22). The elastic member applies an elastic force along the circumference of the outer sleeve (1) to the protrusion (22), so that the second opening on the inner sleeve (2) is away from the first opening along the circumference of the outer sleeve (1), and the limiting section (211) is opposite to the first opening.

2. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The first bayonet (11) is U-shaped, and the distance between two parallel side walls of the first bayonet (11) is equal to the diameter of the connecting rod (7).

3. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The elastic member is a spring (6).

4. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The installation groove (121) is a groove arranged along the circumference of the outer sleeve (1).

5. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The upper end of the mounting portion (12) is an open structure, and a cover plate (3) is connected to the upper opening of the mounting portion (12) to prevent the protrusion (22) and the elastic member from falling out of the upper end of the mounting portion (12).

6. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The outer jacket (1) is connected to a handle (5).

7. The auxiliary device for fixing the connecting rod according to claim 6, characterized in that: The length direction of the handle (5) is perpendicular to the axial direction of the outer sleeve (1).

8. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The upper end of the inner sleeve (2) extends out of the outer sleeve (1), and a rotary handle (4) is provided at the upper end of the inner sleeve (2).

9. The auxiliary device for fixing the connecting rod according to claim 1, characterized in that: The outer diameter of the inner sleeve (2) is equal to the inner diameter of the outer sleeve (1).

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