Connecting rod of micro-trace spine orthopedic and internal fixation system

Abstract

The utility model relates to a connecting rod of a micro-trace spine orthopedic and internal fixation system, which is characterized by comprising a rod body which is connected with a nail seat of an encircling type locking system in a matching way and is used for preventing a ball nail on the nail seat from axially moving, and the rod body comprises a nail seat clamping part and an orthopedic reference part which are connected into a whole along the length direction of the rod body, the top of the shape-righting reference part is provided with a shape-righting reference surface arranged in the axial direction of the shape-righting reference part, and the shape-righting reference surface and the end face of the nail seat after nail locking are kept on the same plane. The connecting rod is used in cooperation with a surrounding type locking nail system, the bending rigidity of the connecting rod can be improved, the torsional rigidity can also be improved, an orthopedic instrument positioning datum plane and an orthopedic loading anchor point can be provided in the spine orthopedic process, the orthopedic position accuracy and the orthopedic efficiency are improved, the incisura after implantation is low, and the orthopedic effect is good. The irritation to surrounding tissues is reduced, and the postoperative pain of a patient is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a connecting rod, specifically to a connecting rod for micro trace spine orthopedic and internal fixation system belongs to orthopedics technical field. BACKGROUND

[0002] The structure of traditional spinal internal fixation system, spinal orthopedic fixation system includes nail seat, intermediate body, ball head screw and screw plug and connecting rod, the ball head of ball head screw is installed in nail seat, intermediate body is arranged in the inner hole of nail seat, connecting rod passes through the slot of nail seat and is located above intermediate body, and the screw plug is pressed into nail seat and is connected with connecting rod. It can be seen that the fixing mode of traditional pedicle screw is to use the inner thread of screw plug and nail seat to apply the force of torsion, so that the connecting rod, intermediate body and ball head screw are tightly locked to achieve the effect of locking and fixing.

[0003] It can be seen that the connecting rod used in the traditional spinal internal fixation system and spinal orthopedic fixation system has the following shortcomings:

[0004] Firstly, since the connecting rod is a columnar structure, and the connecting rod, screw plug and intermediate body are finally locked by point contact, the contact area of mutual locking is small, which directly causes poor locking effect, and the screw plug often slips and loosens, and it is also very inconvenient in the specific operation process.

[0005] Secondly, since the connecting rod with circular cross section has general bending resistance and torsion resistance, in the spinal orthopedic surgery, the bending and torsion strength of the connecting rod is required to be high due to the need to resist strong muscle strength, and the circular connecting rod is insufficient in strength in some specific cases, and the connecting rod with circular cross section cannot provide a good positioning reference surface for the orthopedic instrument (the circular surface instrument will slip), and the position contacted with the circular connecting rod cannot be maintained during the loading process of the orthopedic instrument, which will cause a certain slip and affect the orthopedic effect.

[0006] Thirdly, the columnar connecting rod used in the spinal internal fixation system and the orthopedic fixation system used in the clinic will cause high incision after implantation, which will irritate the surrounding tissues, increase the postoperative deformity and foreign body sensation of the patient, and even cause local swelling, pain and other inflammatory reactions, prolonging the postoperative recovery time. SUMMARY

[0007] The utility model discloses a purpose is: provide a kind of with the connection rod of micro trace spinal orthopedics and internal fixation system of ring type lock nail system matched use, not only can improve the bending stiffness of connection rod itself, can also improve torsional stiffness, and can provide orthopedic instrument positioning reference surface and orthopedic loading anchor point in the process of spinal orthopedics, improve the accuracy of orthopedic position and orthopedic efficiency, and incision is low after implantation, reduce the irritation generated to surrounding tissue, and reduce patient postoperative pain.

[0008] In order to achieve the above object, the technical scheme of the utility model is: a kind of micro trace spinal orthopedics and internal fixation system's connection rod, its innovation point is that: including with the nail seat of ring type locking system Forming cooperation connection and being used to prevent the axial movement of ball head nail on nail seat Rod body, the rod body includes nail seat clamping portion and orthopedic reference portion along its length direction and is integrated, the top of the orthopedic reference portion has orthopedic reference surface arranged along its axial direction, and orthopedic reference surface and the end surface of nail seat after locking nail remain on the same plane.

[0009] In the above technical scheme, the bottom of the nail seat clamping portion has the limiting flat surface that prevents the rotation of rod body in nail seat.

[0010] In the above technical scheme, the two sides of the orthopedic reference portion are provided with reference rib along its length direction and cooperate with the inclined surface of nail seat opening, and the junction of reference rib and nail seat clamping portion forms limiting groove that prevents the radial movement of rod body relative to nail seat, and the edge part of nail seat opening is clamped in limiting groove.

[0011] In the above technical scheme, the reference rib is U-shaped rib.

[0012] In the above technical scheme, the cross section of the rod body is special-shaped cross section composed of inverted triangle and circle, wherein the cross section of the nail seat clamping portion is circular, and the cross section of the orthopedic reference portion is inverted triangle.

[0013] The utility model has the positive effect that: after using the connection rod of micro trace spinal orthopedics and internal fixation system of the utility model, because the utility model includes with the nail seat of ring type lock nail system Forming cooperation connection and being used to prevent the axial movement of ball head nail on nail seat Rod body, the rod body includes nail seat clamping portion and orthopedic reference portion along its length direction and is integrated, the top of the orthopedic reference portion has orthopedic reference surface arranged along its axial direction, and orthopedic reference surface and the end surface of nail seat after locking nail remain on the same plane,

[0014] When the connecting rod of the utility model is used in conjunction with the embracing locking system, and the embracing locking system comprises a locking seat, a nail seat and a ball head nail, the ball head of the ball head nail is connected with the ball hole of the nail seat, the locking seat is arranged on the outer periphery of the nail seat, the rod body is arranged in the nail seat, the nail seat is pulled to make the nail seat, the ball head nail and the rod body be locked as a whole,

[0015] The advantages of the design are as follows: first, the cross section of the nail seat clamping part and the orthopedic reference part is a special-shaped cross section composed of an inverted triangle and a circle, according to material mechanics and structural mechanics, the special-shaped cross section area is larger than the circular cross section, and the bending stiffness and torsional strength are strengthened;

[0016] Secondly, the orthopedic reference surface has a relatively wide plane and is in a flat shape, instead of a columnar structure in the prior art, which facilitates the connection and fixation of the orthopedic instrument, provides an orthopedic reference for the orthopedic instrument, and provides a stable attachment surface for the load of the orthopedic instrument, so that the orthopedic degree control is more accurate and precise;

[0017] Thirdly, when the utility model is used in conjunction with the nail seat, the friction force is relied on to support at multiple points, so that the contact area of mutual locking is increased, the locking effect is greatly improved, and the structure is more stable and firm than the traditional structure; meanwhile, the special-shaped cross section composed of an inverted triangle and a circle forms a limiting groove at the joint of the two shapes, so that the nail seat and the connecting rod are clamped and fixed, so that the traditional locking plug is not needed for fixation, the incision of the implant is reduced, the stimulation to the soft tissue such as muscle is reduced, and the postoperative discomfort of the patient is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of one specific embodiment of the utility model;

[0019] Figure 2 is a three-dimensional structural schematic diagram of the connecting rod of the utility model;

[0020] Figure 3 is a state diagram of the utility model used in conjunction with the embracing locking system. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the drawings and the embodiments given, but is not limited thereto.

[0022] As Figure 1 , 2,3, a connecting rod of a micro trace spinal orthopedic and internal fixation system, comprising a rod body 1 connected with a nail seat of a ring type locking nail system and used for preventing axial movement of a ball head nail on the nail seat, the rod body 1 comprising a nail seat clamping portion 11 and an orthopedic reference portion 12 integrated along the length direction, the top of the orthopedic reference portion 12 being provided with an orthopedic reference surface 13 arranged along the axial direction, and the orthopedic reference surface 13 and the end surface of the nail seat after locking are kept in the same plane.

[0023] Further, the nail seat clamping portion 11 and the orthopedic reference portion 12 combined constitute a special-shaped cross section, i.e. a special-shaped cross section composed of an inverted triangle and a circle.

[0024] As shown in Figure 1 , 2 , 3, further reducing the vertical direction notch, preventing the connecting rod and the ball head screw interference, the bottom of the nail seat clamping portion 11 is provided with a limiting flat surface 14 for preventing the rod body from rotating in the nail seat.

[0025] As shown in Figure 1 , 2 , 3, the two sides of the orthopedic reference portion 12 are provided with reference rib 15 connected with the inclined surface of the nail seat opening along the length direction, and the reference rib 15 and the connection part of the nail seat clamping portion 11 form a limiting groove 16 for preventing the rod body from moving radially relative to the nail seat, and the edge part of the nail seat opening is clamped in the limiting groove 16. The limiting groove 16 is used as the end surface of the nail seat clamping, and is designed in an arc shape, which is the transition part of the round rod and the top flat surface, can effectively reduce the stress concentration of the two end structures, and improve the bending stiffness and torsional strength of the rod body.

[0026] Further, in order to make the structure more reasonable, the reference rib 15 is a U-shaped rib.

[0027] Further, in order to improve the bending stiffness and torsional strength of the rod body, the cross section of the rod body 1 is a special-shaped cross section composed of an inverted triangle and a circle, wherein the cross section of the nail seat clamping portion 11 is a circle, and the cross section of the orthopedic reference portion 12 is an inverted triangle.

[0028] As shown in Figure 3 , the utility model is used with the ring type locking nail system, and the ring type locking nail system comprises a locking nail seat 2, a nail seat 3 and a ball head nail 4, the ball head of the ball head nail 4 is connected with the ball hole of the nail seat 3, the locking nail seat 2 is arranged on the outer periphery of the nail seat 3, the rod body 1 is arranged in the nail seat 3, the locking nail seat 2 is pulled to lock the nail seat 3, the ball head nail 4 and the rod body 1 as a whole, and the orthopedic reference surface 13 and the end surface of the nail seat 3 are kept in the same plane, in the orthopedic surgery, the orthopedic reference surface 13 is used as the supporting surface of the orthopedic puller top rod, and plays the roles of positioning and pressure loading surface.

[0029] Therefore, the structure has the advantages that:

[0030] Firstly, the nail seat clamping part and the orthopedic reference part are composed of a special-shaped section combined by an inverted triangle and a circle, according to material mechanics and structural mechanics, the special-shaped section area is larger than the circular section, and the bending stiffness and torsional strength are strengthened;

[0031] Secondly, the orthopedic reference surface has a relatively wide plane, and the whole is flat, not a columnar structure in the prior art, which facilitates the connection and fixation of the orthopedic instrument, not only provides an orthopedic reference for the orthopedic instrument, but also provides a stable attachment surface for the orthopedic instrument loading force, so that the orthopedic degree control is more accurate and accurate;

[0032] Thirdly, when the utility model is used in matching with the nail seat, the contact area of mutual locking is increased by relying on frictional force multi-point support, so that the locking effect is greatly improved, and the traditional structure is more stable and more firm; at the same time, the special-shaped section combined by the inverted triangle and the circle forms a limiting groove at the joint of the two shapes, so that the nail seat and the connecting rod are clamped and fixed, so that the traditional locking plug is not needed for fixation, the incision of the implant is reduced, the stimulation to the muscle and other soft tissues is reduced, and the postoperative discomfort of the patient is reduced.

[0033] In summary, the utility model not only can improve the bending stiffness of the connecting rod itself, but also can improve the torsional stiffness, and the orthopedic reference surface (the upper end surface) is a flat surface, which can provide an orthopedic instrument positioning reference surface and an orthopedic loading anchor point during the spine orthopedic process, improve the accuracy of the orthopedic position and the orthopedic efficiency.

[0034] Based on the above ideal embodiments of the utility model, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A connecting rod for a micro trace spinal orthopedic and internal fixation system, characterized in that: The rod (1) is connected with the peg seat of the ring-shaped locking system in a matching way and is used to prevent the axial movement of the peg shaft on the peg seat, the rod (1) comprises a peg seat clamping part (11) and an orthopedic reference part (12) which are integrated along the length direction, the top of the orthopedic reference part (12) is provided with an orthopedic reference surface (13) arranged along the axial direction, and the orthopedic reference surface (13) is kept in the same plane with the end surface of the peg seat after locking.

2. The connecting rod of the micro-trace spinal orthopedic and internal fixation system according to claim 1, characterized in that: The bottom of the peg seat clamping part (11) is provided with a limiting flat surface (14) for preventing the rotation of the rod in the peg seat.

3. The connecting rod of the micro-trace spinal orthopedic and internal fixation system according to claim 1, characterized in that: The two sides of the orthopedic reference part (12) are provided with reference ribbons (15) which are connected with the inclined surface of the opening of the peg seat along the length direction, and the reference ribbons (15) and the peg seat clamping part (11) form a limiting groove (16) for preventing the radial movement of the rod relative to the peg seat at the joint part, and the edge part of the opening of the peg seat is clamped in the limiting groove (16).

4. The connecting rod of the micro-trace spinal orthopedic and internal fixation system according to claim 3, characterized in that: The reference ribbons (15) are U-shaped ribbons.

5. The connecting rod of the micro-trace spinal orthopedic and internal fixation system according to claim 1, characterized in that: The cross section of the rod (1) is a special-shaped cross section composed of an inverted triangle and a circle, wherein the cross section of the peg seat clamping part (11) is a circle, and the cross section of the orthopedic reference part (12) is an inverted triangle.

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