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CN-122005064-A - Small-view blind area high-frequency slitting knife based on cutter bar part insulation

CN122005064ACN 122005064 ACN122005064 ACN 122005064ACN-122005064-A

Abstract

The invention discloses a small-vision blind area high-frequency incision knife based on knife bar partial insulation, which belongs to the technical field of medical instruments and comprises an outer tube and a knife bar slidably arranged in the outer tube, wherein the far end of the knife bar can extend out of the far end of the outer tube, the knife bar is provided with an integral extending length from the far end face of the knife bar and a conductive working section positioned at the far end of the knife bar and used for tissue cutting, the integral extending length is 3.5mm to 4mm, the axial length of the conductive working section is limited to 1.5mm to 2mm, and an insulating layer is arranged on the part of the knife bar positioned at the near end side of the conductive working section. Meanwhile, the risks of excessive thermal damage, miscut or perforation of tissues possibly caused by overlong cutter bars are avoided.

Inventors

  • ZHANG CHAO
  • BAO WENDONG

Assignees

  • 江苏安特尔医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. A cutter bar part insulation-based low-vision blind area high-frequency cutting knife comprises an outer tube (100) and a cutter bar (200) slidably arranged in the outer tube (100), wherein the distal end of the cutter bar (200) can extend out of the distal end of the outer tube (100), The blade bar (200) has an overall extension (H) from its distal end face, and an electrically conductive working section (210) at its distal end for tissue cutting; The overall extension is 3.5mm to 4mm; The axial length of the conductive working section (210) is defined as 1.5mm to 2mm; The portion of the cutter bar (200) located at the proximal end side of the conductive working section (210) is provided with an insulating layer, so that after the cutter bar (200) is extended, only the conductive working section (210) is exposed for conductive cutting.
  2. 2. The knife bar portion insulation-based small-field blind area high frequency cutting knife according to claim 1, wherein the insulation layer is an insulation coating (310) applied to the surface of the knife bar (200).
  3. 3. The knife bar portion insulation-based small-field blind area high frequency cutting knife according to claim 2, wherein the insulation coating (310) is made of PTFE, FEP or PET.
  4. 4. The knife bar portion insulation-based small-field blind area high-frequency cutting knife according to claim 1, wherein the insulation layer is a heat shrink tube (320) sleeved on the knife bar (200).
  5. 5. The knife bar portion insulation-based small-view blind area high-frequency cutting knife according to claim 4, wherein a boss (220) for axially limiting the heat shrinkage tube (320) is provided on the knife bar (200).
  6. 6. The knife bar portion insulation based low field blind area high frequency cutting knife of claim 5, wherein the boss (220) is disposed 1.5mm to 2mm from the knife bar (200) distal end face.
  7. 7. The knife bar portion insulation-based small-field blind area high-frequency cutting knife according to claim 1, wherein the insulation layer is an insulation hard tube (330) sleeved on the knife bar (200).
  8. 8. The knife bar portion insulation-based small-view blind area high-frequency cutting knife according to claim 7, wherein the knife bar (200) has a stepped structure (230), and the insulation hard tube (330) is sleeved at the stepped structure (230) of the knife bar (200).
  9. 9. The knife bar portion insulation-based small-view blind zone high-frequency incision knife according to claim 8, wherein the proximal end of the knife bar (200) is connected with a traction wire (500) through a butt joint tube (400), and the rear end of the insulation hard tube (330) is abutted with the distal end of the butt joint tube (400).
  10. 10. The knife bar portion insulation-based small-view blind area high-frequency cutting knife according to claim 8, wherein the insulation hard tube (330) is made of ceramic or PTFE.

Description

Small-view blind area high-frequency slitting knife based on cutter bar part insulation Technical Field The invention relates to the technical field of medical equipment, in particular to a small-vision blind area high-frequency cutting knife based on cutter bar partial insulation. Background The high-frequency incision knife is an indispensable medical instrument in endoscopic submucosal dissection, and is mainly used for cutting lesions of digestive tract mucous membranes (such as gastric mucous membrane, colorectal mucous membrane and esophageal mucous membrane) by matching with high-frequency electricity. The working principle is that the cutter bar at the front end of the outer tube is extended through the control of the handle, high-frequency current is conducted to focus tissues through the cutter bar, and the tissues are carbonized and separated or hemostasis is achieved by utilizing high temperature generated by discharge, so that the electric cutting or electric coagulation function is realized. The main current high-frequency slitting knife in the market at present, such as a common T-shaped water injection high-frequency slitting knife, has a knife bar extending length which is usually designed to be 1.5mm or 2mm. The length of the conductive working area is controlled, safety during surgical cutting is ensured, and the risk of miscut of healthy tissues or perforation caused by overlong cutter bars is avoided. Therefore, the whole area extending out of the cutter bar is a conductive working area, namely, how long the cutter bar extends out, and how long the conductive working length is. However, the prior art scheme has the following limitation in practical clinical application that most areas of the cutter bar are easily shielded by the insulating seat under the view of the endoscope due to the short extension length of the cutter bar, so that a larger view blind area is formed. The doctor can not clearly observe the actual position of the cutter bar and the relative relation between the cutter bar and focus tissues, and can only judge by experience and hand feeling, so that great challenges are brought to accurate cutting of the focus edge and control of a cutting path. In addition, in some special surgical scenarios, such as where the cutting site is far from, deep in the organ folds, or partially obscured by other tissue, the existing short knife bar may not be able to effectively reach the target lesion, making cutting difficult, even requiring instrument replacement or surgical access changes, increasing the complexity and time costs of the procedure. In order to solve the problem of visual field blind areas, part of the existing designs attempt to improve visual angle by increasing the round angle of the insulating base, but are limited by the limitation of the whole size and structural strength of the product, and the improvement effect brought by the method is extremely limited and cannot radically eliminate the blind areas. If the visual field is improved simply by increasing the extension length of the cutter bar, the synchronous increase of the conductive working length is directly caused, so that a new potential safety hazard is caused, namely, the overlong conductive area is extremely easy to cause thermal damage to non-target tissues, and the risks of miscut and perforation are obviously increased. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a small-view blind area high-frequency cutting knife based on the insulation of a knife bar part, which aims to solve the problems in the background art. In order to achieve the above object, a first aspect of the present invention provides a small-view blind zone high-frequency cutting blade based on partial insulation of a blade bar, comprising an outer tube and a blade bar slidably disposed in the outer tube, a distal end of the blade bar being capable of protruding from a distal end of the outer tube; The overall extension is 3.5mm to 4mm; the axial length of the conductive working section is defined as 1.5mm to 2mm; And an insulating layer is arranged on the part, located at one side of the proximal end of the conductive working section, of the cutter bar, so that after the cutter bar extends out, only the conductive working section is exposed for conductive cutting. Optionally, the insulating layer is an insulating coating coated on the surface of the cutter bar. Optionally, the material of the insulating coating is PTFE, FEP or PET. Optionally, the insulating layer is a heat shrinkage tube sleeved on the cutter bar. Optionally, a boss for axially limiting the heat shrinkage tube is arranged on the cutter bar. Optionally, the boss is disposed 1.5mm to 2mm from the cutter bar distal end face. Optionally, the insulating layer is an insulating hard tube sleeved on the cutter bar. Optionally, the cutter bar has a step structure, and the insulating hard tub