A rotating labor-saving needle removal structure for radiofrequency ablation catheter

Abstract

The present invention provides a rotating, labor-saving needle removal structure for a radio frequency ablation catheter, which includes a handle cover, a gear pair, a rotating connecting rod, and an electrode needle connecting rod. The gear pair includes a gear and a rack. A gear column is arranged on the inner side of the handle cover. The rotating connecting rod is fixedly connected to the end face of the gear close to the tooth side. The gear is rotatably mounted on the gear column. The rotating connecting rod and the center of the gear column form a first force arm. The meshing portion of the gear pair and the center of the gear column form a second force arm. The length of the first force arm is at least twice the length of the second force arm. The rack is fixedly connected to the electrode needle connecting rod, thereby achieving a labor-saving and stable needle removal effect.

Description

Technical Field

[0001] The invention relates to the field of radiofrequency ablation, and in particular to a rotary, labor-saving needle removal structure of a radiofrequency ablation catheter for gastroesophageal reflux. Background Art

[0002] As a type of thermal ablation, radiofrequency technology has become a trend in the industry with the development of minimally invasive ablation. Gastroesophageal reflux is a common chronic upper gastrointestinal motility disorder, which is caused by pathological changes such as excessive relaxation of the lower esophageal sphincter, hiatal hernia and relaxation of the esophagogastric junction, either alone or together. Radiofrequency ablation technology has developed rapidly in the treatment of gastroesophageal reflux disease due to its advantages of minimal invasiveness and good efficacy.

[0003] Radiofrequency ablation catheter is an instrument that implements radiofrequency ablation technology. The current method of removing the electrode needle of the radiofrequency ablation catheter is to directly push / pull back the needle removal fixing mechanism with the thumb to achieve the needle removal / retraction process. This needle removal method is more laborious. According to statistics, during a radiofrequency ablation treatment operation for gastroesophageal reflux, the needle removal and retraction process is repeated about 40 times. The doctor's thumb will soon feel pain due to the continuous force of the repeated direct pushing / pulling back of the needle removal fixing structure. Moreover, the effort of pushing will affect the efficiency of the operation. Summary of the invention

[0004] The present invention provides a rotating labor-saving needle removal structure of a radiofrequency ablation catheter, which can realize a very labor-saving process of completing the electrode needle removal / retraction process, and has a simple and reliable structure.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is implemented as follows:

[0006] A rotating, labor-saving needle removal structure for a radiofrequency ablation catheter comprises a handle cover, a gear pair, a rotating connecting rod, and an electrode needle connecting rod, characterized in that the gear pair comprises a gear and a rack, a gear column is arranged on the inner side of the handle cover, the rotating connecting rod is fixedly connected to the end face of the gear close to the tooth side, the gear is rotatably mounted on the gear column, the rotating connecting rod and the center of the gear column form a first lever arm, the meshing portion of the gear pair and the center of the gear column form a second lever arm, the length of the first lever arm is at least twice the length of the second lever arm, and the rack is fixedly connected to the electrode needle connecting rod.

[0007] Furthermore, the gear comprises an assembly hole, a gear tooth portion, and a connecting rod assembly screw hole, and the assembly hole is rotatably mounted on the gear column.

[0008] Furthermore, the rotating connecting rod includes a screw through hole and a rotating force-bearing block, and the screw through hole is aligned with the connecting rod assembly screw hole in the upper and lower parts and is fixed by screws.

[0009] Furthermore, the rack includes an electrode needle connecting rod assembly hole and a rack tooth portion, and the gear tooth portion and the rack tooth portion move relative to each other.

[0010] Furthermore, at least two electrode needle connecting rod assembly holes are evenly arranged, the number of the electrode needle connecting rods is consistent with the number of the electrode needle connecting rod assembly holes, one end of the electrode needle connecting rod is fixedly connected through the electrode needle connecting rod assembly hole, and the other end of the electrode needle connecting rod is fixedly connected to the electrode needle.

[0011] Furthermore, the fixing connection method includes adhesive fixing, screw fixing and welding fixing.

[0012] Furthermore, the handle cover is provided with an arc-shaped through hole, and the rotating force-bearing block partially passes through the arc-shaped through hole.

[0013] Furthermore, the gear is a sector-shaped body, and the angle of the sector-shaped body is between 30-90 degrees.

[0014] Furthermore, the gear pair, rotating connecting rod and electrode needle connecting rod are assembled on one side of the handle cover, and a protruding structure for auxiliary support is correspondingly provided at the position where the rack and electrode needle connecting rod are placed inside the handle cover.

[0015] Working principle: Control the rotating force block of the rotating connecting rod to move forward and backward. The rotating connecting rod drives the gear to rotate along the center of the assembly column. The moving gear teeth contact the rack teeth, driving the rack to produce relative movement. The movement of the rack drives the movement of the electrode needle connecting rod connected to it, thereby driving the electrode needle to move. The rotating connecting rod and the center of the gear column form a first force arm, and the meshing part of the gear pair and the center of the gear column form a second force arm. The length of the first force arm is at least twice the length of the second force arm. The purpose of saving effort is achieved. When the gear and the rack are matched, the rack cannot drive the gear to rotate, and it has a self-locking function. In addition, at least two electrode needle connecting rods are set to ensure that the movement process of the electrode needle connecting rod is stable, and the electrode needle can be stably extended / retracted.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) Under the condition of the same moment, the force can be reduced by increasing the length of the lever arm;

[0018] (2) When the gear rack is matched, the self-locking function of the rack and the setting of more than two electrode needle connecting rods can achieve the purpose of stable transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal assembly of Example 1.

[0020] Figure 2It is a structural schematic diagram of the rotating connecting rod of Example 1.

[0021] Figure 3 It is a schematic diagram of the structure of the gear of Example 1.

[0022] Figure 4 It is a schematic diagram of the structure of the rack in Example 1.

[0023] Figure 5 This is the overall schematic diagram of Example 1

[0024] Description of main component symbols:

[0025] 1-electrode needle connecting rod; 2-rotating connecting rod; 3-gear pair; 4-handle cover; 21-screw through hole; 22-rotating force block; 31-gear; 32-rack; 311-assembly hole; 312-gear tooth; 313-connecting rod assembly screw hole; 321-electrode needle connecting rod assembly hole; 322-rack tooth; 41-left half handle cover; 42-right half handle cover; 43-assembly column.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. DETAILED DESCRIPTION

[0027] Example 1

[0028] A rotating, labor-saving needle removal structure for a radiofrequency ablation catheter, the structure consisting of an electrode needle (not shown), an electrode needle connecting rod 1, a rotating connecting rod 2, a gear pair 3, and a handle cover 4. The handle cover 4 is divided into a left half handle cover 41 and a right half handle cover 42, which can be snapped together. The electrode needle connecting rod 1, the rotating connecting rod 2, and the gear pair 3 are assembled in the left half handle cover 41.

[0029] The rotating connecting rod 2 is provided with a screw through hole 21 and a rotating force block 22. The gear pair 3 is composed of a gear 31 and a rack 32. The gear 31 is provided with an assembly hole 311, a gear tooth portion 312, and a connecting rod assembly screw hole 313. The rack 32 is provided with an electrode needle connecting rod assembly hole 321 and a rack tooth portion 322. The handle cover 4 is provided with an arc-shaped opening, and the upper part of the rotating force block 22 on the rotating connecting rod 2 extends to the outside of the handle cover 4 through the arc-shaped opening, which is convenient for subsequent use. The screw through hole 21 on the rotating connecting rod 2 is aligned with the connecting rod assembly screw hole 313 on the gear 31, and the screw is fixed by passing through the two holes in sequence. An assembly column 43 is fixedly provided inside the handle cover 4, and the assembly hole 311 on the gear 31 is rotatably mounted on the assembly column 43. The force block 22 is rotated by hand, and the connecting rod 2 rotates forward and backward, further driving the gear 31 to rotate along the assembly column 43. The rotation of the gear 31 causes the gear teeth 312 and the rack teeth 322 to move forward and backward relative to each other, further driving the electrode needle connecting rod 1 installed on the rack 32 to move forward and backward, thereby driving the electrode needle to be extended / retracted.

[0030] When the needle is extended / retracted, the force point of the gear 31 is at the position where the gear tooth portion 312 meshes with the rack tooth portion 322, which forms a torque with the center of the assembly column 43, and the force point of the gear 31 and the center of the assembly column 43 form a second force arm. The operator turns the force block 22 to form a first force arm with the center of the assembly column 43, and the length of the first force arm is at least twice the length of the second force arm.

[0031] In this structure, the rack 32 can only be driven to move by the gear 31. Therefore, as long as the gear 31 stops moving, the rack 32 will stop moving immediately, so the transmission is stable.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotating and labor-saving needle removal structure for a radiofrequency ablation catheter, comprising a handle cover, a gear pair, a rotating connecting rod, and an electrode needle connecting rod, characterized in that: The gear pair includes a gear and a rack. A gear column is arranged on the inner side of the handle cover. The rotating connecting rod is fixedly connected to the end face of the gear near the tooth side. The gear is rotatably mounted on the gear column. The rotating connecting rod and the center of the gear column form a first force arm. The meshing portion of the gear pair and the center of the gear column form a second force arm. The length of the first force arm is at least twice the length of the second force arm. The rack is fixedly connected to the electrode needle connecting rod. The gear includes an assembly hole, a gear tooth portion, and a connecting rod assembly screw hole. The assembly hole is rotatably mounted on the gear column. The rotating connecting rod includes a screw through hole and a rotating force block. The screw through hole is aligned with the connecting rod assembly screw hole up and down and is fixed by a screw. The rack includes an electrode needle connecting rod assembly hole and a rack tooth portion. The gear tooth portion and the rack tooth portion move relative to each other. At least two electrode needle connecting rod assembly holes are evenly arranged. The number of electrode needle connecting rods is consistent with the number of electrode needle connecting rod assembly holes. One end of the electrode needle connecting rod is fixedly connected through the electrode needle connecting rod assembly hole, and the other end of the electrode needle connecting rod is fixedly connected to the electrode needle.

2. The rotating labor-saving needle removal structure of the radiofrequency ablation catheter according to claim 1 is characterized in that: The fixing connection methods include gluing, screwing and welding.

3. The rotating labor-saving needle removal structure of the radiofrequency ablation catheter according to claim 1 is characterized in that: The handle cover is provided with an arc-shaped through hole, and the rotating force-bearing block partially passes through the arc-shaped through hole.

4. The rotating labor-saving needle removal structure of the radiofrequency ablation catheter according to claim 1 is characterized in that: The gear is a sector-shaped body, and the angle of the sector-shaped body is between 30 and 90 degrees.

5. The rotating labor-saving needle removal structure of the radiofrequency ablation catheter according to claim 1 is characterized in that: The gear pair, rotating connecting rod and electrode needle connecting rod are assembled on one side of the handle cover, and the position where the rack and electrode needle connecting rod are placed inside the handle cover is provided with a protruding structure for auxiliary support.

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