CN210250033U

CN210250033U - Elastic connecting rod

Info

Publication number: CN210250033U
Application number: CN201920283122.4U
Authority: CN
Inventors: 董谢平; 李青莉; 何伟义; 张元维
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2020-04-07
Anticipated expiration: 2029-03-06

Abstract

The utility model discloses a be applied to the medical treatment that uses in bone surgery and neurosurgery, specifically be exactly one kind both can be used to conventional open operation, also can be applied to among the present popular minimal access surgery, a pedicle screw elasticity connective bar that has fine motion attitude function, its characterized in that: the elastic connecting rod of the pedicle screw is arranged at two ends of a section of cylindrical spring and is respectively connected with a section of rigid metal round rod, and the outer diameter of the cylindrical spring is not more than that of the connected rigid metal round rod.

Description

Elastic connecting rod

Technical Field

The utility model relates to an use the medical treatment that uses in bone surgery and neurosurgery, especially one kind can use the elastic connection stick in the pedicle of vertebral arch nail stick system that is made according to "fixed" theory of non-fusion and has the fine motion attitude function in the current popular "wicresoft" operation.

Background

At present, in the field of bone surgery, the traditional scheme for treating herniated intervertebral disc and spinal stenosis is a pedicle screw-rod system which is matched with a rigid fixation fusion theory called gold law, wherein a connecting rod adopted in the system is called a rigid fixation connecting rod, and is called a fixation rod for short; with the development of clinical medicine, a new academic genre called "non-fusion fixation" theory was derived, which can realize the tiny swing of the fixed segment by connecting pedicle screws with elastic connecting rods, which are called "dynamic connecting rods", and are simply called "dynamic rods"; to achieve such a movable function, either the movable section is set to a larger outer diameter, as in patent No. CN 102475571a entitled "link structure"; or the whole rod is made into flexible rod, if the registration certificate number is: although the Dynesys system of the national instruments 20173460363 has good medical effect clinically, the dynamic segment of the Dynesys system can not pass through the U-shaped connecting groove on the nail seat of the pedicle nail in a minimally invasive state because the outer diameter of the dynamic segment is far larger than the connecting section connected with the pedicle nail, and can only swing in a certain plane range due to the structural characteristics of the Dynesys system, so that the Dynesys system can not well meet the clinical requirement; in the latter case, the rope is flexible and requires a cannula in operation, which is troublesome; therefore, the method cannot be applied to the minimally invasive surgery which gradually becomes popular at present, particularly cannot be applied to the minimally invasive surgery with more than two sections, and only can be applied to the traditional fully open surgery; in addition, because the movable sections of the two products have larger outer diameters, the psychological barrier of foreign body implantation is generated by a patient who increases the number of the patients, and the discomfort of pain and the like caused by muscle stimulation of the implant is also increased.

How to improve the dynamic rod which can only be applied to the fully open type operation into a problem which can be applied to the common fully open type operation and the minimally invasive operation and is a urgent need to be solved in clinic of the bone surgery.

Disclosure of Invention

The utility model provides a solution, namely, aiming at the defects that in the prior dynamic rod, the movable section has larger outer diameter and can not pass through the U-shaped open slot on the nail seat in the minimally invasive surgery, the dynamic rod can not be applied to the minimally invasive surgery and has single movable range, the utility model adopts a simple and feasible improvement, namely, a movable section which has the same function of life and can generate dynamic motion and the outer diameter of which is not more than the rigid sections at two ends is processed to replace the original movable section with larger outer diameter, so that the whole dynamic rod can be applied to the minimally invasive surgery; moreover, the movement has a larger movement range, namely the movement can not only swing on a plane, but also do conical swing and axial extension, thereby realizing the function of 'micro-motion state' in the real sense.

The technical scheme of the utility model as follows:

a metal wire with high elasticity is selected and wound into a small section of cylindrical spring, two ends of the small section of cylindrical spring are respectively welded with a section of rigid metal round bar, and the outer diameter of the cylindrical spring is not larger than the metal round bar. Preferably, one end of the rigid section is made into a conical shape, namely a head section, so that the rigid section is conveniently inserted into a U-shaped groove at the upper end of the pedicle screw; the opposite end is called the tail section.

Preferably, a concave groove or a spiral core shape matched with the cylindrical spring is processed at the joint of the metal round rod of the rigid section and the cylindrical spring, so that the firmness of welding with the cylindrical spring is increased, and the acting force of a rotating couple is transmitted; in clinical application, the rigid section is placed in a nail seat of the pedicle screw and is locked by the screw plug; the movable section is arranged between the upper and lower adjacent pedicle screws to form a movable area in which the rigid sections at the two ends move relatively.

Still further, the connecting area of the rigid section and the cylindrical spring, when exceeding two turns of the spring, can be additionally connected by a pin besides the welding connection.

Still further, the elastic connecting rod can be made into a single-section elastic rod suitable for single-section elastic fixation, a single-section elastic rod and a double-section elastic rod suitable for two adjacent sections to be fixed and a single-section elastic rod or a multi-section elastic rod which is suitable for adjacent multi-section or jump-shaped distribution multi-section fixation and elastic sections are distributed in different sections according to the clinical requirements of the number of the fixed sections and each fixed section on rigid fixation and elastic fixation.

The invention has the advantages of realizing multidirectional micromotion, and being convenient for realizing percutaneous minimally invasive implantation because no thick part exists on the whole rod circumference.

Drawings

The invention will be further described with reference to the following detailed description of embodiments and the accompanying drawings in which:

fig. 1 is a two-dimensional view of the present invention;

fig. 2 is an effect diagram and an exploded view of the present invention;

fig. 3 shows two embodiments of the present invention in which the rigid section is connected to the cylindrical spring;

FIG. 4 is a diagram illustrating the difference between the active state of the dynamic stick of the present invention and the active state of the conventional dynamic stick;

fig. 5 is a schematic view of an embodiment of the present invention;

wherein: a cylindrical spring 1; a rigid section (tail section) 2; a rigid section (head section) 3;

a contact surface 21 connecting the rigid section and the spring; a contact surface 31 connecting the rigid section with the spring;

Detailed Description

Whether the dynamic rod with good medical effect can be applied to the gradually popular minimally invasive surgery or not is the key point that whether the outer diameter of the movable section raised due to the structural characteristics in the traditional dynamic rod is improved to be not more than that of the connected rigid section or not is the key point; the utility model discloses the technical scheme who discloses is exactly with cutting of a rigid connective bar, then the concatenation is a small segment cylindricality spring 1, forms the utility model discloses shown elastic connection stick, as shown in the attached figure 1.

The whole elastic connecting rod can penetrate through the U-shaped open slot on the nail seat of a plurality of pedicle screws in a minimally invasive state and then is locked by the screw plug; under the state of completing the operation, each pedicle screw and the implanted vertebral body can move relatively through the movable section on the elastic connecting rod, so that the whole pedicle screw and rod system can also present the expected non-fusion fixed medical effect under the minimally invasive condition.

The technical features of the present invention can be more clearly seen from the effect diagram and the exploded view shown in fig. 2: the rigid section (tail section) 2 is shorter, while the rigid section (head section) 3 is longer, and the top end of the rigid section is provided with a taper; in the operation, a special tool is used, the rigid section (tail section) 2 is clamped, the rigid section (head section) 3 and the cylindrical spring 1 which plays a role of a movable section penetrate through a U-shaped open slot on a nail seat of each pedicle nail, and therefore, each pedicle nail is connected and fixed; from this point on, it can also be seen: because the U-shaped open slot on the pedicle screw is in clearance fit with the rigid section of the connecting rod, the clearance is very small, and the dynamic rod applied clinically at present cannot pass through the U-shaped opening in a minimally invasive state because the movable section of the dynamic rod is thick; or the Dynesys system can not be applied in a minimally invasive state due to the inherent characteristics of the soft cable and the sleeve, so a dynamic rod which can be applied in the minimally invasive surgery is clinically sought; the utility model perfectly solves the technical problem by using a simple technical scheme; this is sufficient to demonstrate that: the utility model discloses have novelty and creativity.

The working principle of the moving section, which is formed by a small section of cylindrical spring 1, is known as follows: due to the existence of the movable section shown in the utility model, the rigid section is no longer the movable range of the traditional dynamic rod and is limited to a certain plane (as shown in the upper effect diagram and the two-dimensional diagram of fig. 4); but not only can swing on any plane, but also can do conical swing and telescopic movement along the axial direction thereof, thereby greatly meeting the clinical requirement (as shown in the effect diagram of the utility model at the lower part of figure 4); this is again demonstrated: the utility model discloses a novelty and creative place.

In clinic, the diameter of the rigid section of the elastic connecting rod is 4-6.5 mm generally, and the diameter of the rigid section is 6mm mostly; when the utility model is developed, 1.8 mm-2 mm metal wires are selected and wound into 5 circles of cylindrical springs (dense shape) with the outer diameter of 5.8-6 mm, and two ends of the springs are respectively welded and fixed by a circle and a rigid section with the outer diameter of 6mm, as shown in 21 in the attached figure 2, namely, under the condition that three circles of springs are used as active sections, the springs are compared with dynamic connecting rods which are used only in full-open type operations and are used before counting the types, and all physical properties are basically the same; therefore, it can be considered that: the utility model discloses a have sufficient practicality.

As shown in fig. 3, the present invention is applicable to two embodiments of the process for permanently connecting the cylindrical spring 1 and the

rigid sections

2 and 3; as shown in the left side, 3/4 corresponding spiral concave grooves of the spring are processed on the rigid section, and then the spring is welded after butt joint; in another embodiment, the rigid section is processed into more than 1.5 circles of spiral bodies matched with the inner bore diameter of the spring, the spiral bodies are screwed into the inner cavity of the cylindrical spring 1, and then the spiral bodies are welded on the basis, so that the connection firmness can be effectively improved, as shown in the right side of the attached drawing 3.

The utility model discloses an in the development process discovery, each academic genre that is in exploring the stage for the adaptation is different to each physical index of clinical dynamic link stick, the utility model discloses also develop the elastic connection stick that differentiates equally, be exactly the line footpath through the wire of adjusting the coiling spring and the circle height and the number of turns of spring, also reach good effect, when the circle height of spring is greater than the line footpath, become "dredge the spring" form promptly, under this state, elastic connection stick's axial flexibility will be strengthened.

In addition, the rigid section can be pre-bent by a special tool, such as a rod bending machine, according to clinical needs so as to adapt to the curvature of the cone of the human body.

The above embodiments are the preferred embodiments of the present invention, and other principles and basic structures are the same as or similar to those of the present embodiment, and are within the protection scope of the present invention.

Claims

1. An elastic connecting rod, which is characterized in that: the elastic connecting rods are arranged at two ends of a section of cylindrical spring and are respectively connected with a section of rigid metal round rod, and the outer diameter of the cylindrical spring is not larger than that of the connected rigid metal round rod.

2. An elastic connector rod according to claim 1, wherein: the cylindrical spring is formed by winding a metal wire with high elasticity and is wound into a 'seal spring' form.

3. An elastic connector rod according to claim 1, wherein: the cylindrical spring is wound into a sparse spring form, and the clinical requirements are met by changing the parameters of the spring wire, such as wire diameter, coil height and the like.

4. An elastic connector rod according to claim 1, wherein: the end face of the rigid metal round rod connected with the cylindrical spring is processed into a concave groove or a spiral core shape matched with the spring, so as to be beneficial to welding after butt joint matching.

5. An elastic connector rod according to claim 1, wherein: the longer length of rigid metal rod is designed to be in a state similar to the spine of a human body and provided with a certain radian, and one end of the rigid metal rod is processed into a taper so as to be beneficial to leading in and penetrating through the U-shaped opening of each pedicle screw in the operation.