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CN-121987125-A - Insertion tube assembly of flexible endoscope traction spring tube

CN121987125ACN 121987125 ACN121987125 ACN 121987125ACN-121987125-A

Abstract

The invention relates to an insertion tube assembly of a flexible endoscope traction spring tube, which comprises an insertion tube framework, and a bent angle traction unit and an operation handle connecting unit which are arranged at the head end and the tail end of the insertion tube framework, wherein the bent angle traction unit comprises an insertion tube front joint ring and an insertion tube rear joint ring which are arranged at the head end and the tail end of a woven tube, and the innovation point is that the insertion tube front joint ring is provided with elastic clamping heads symmetrically arranged along the insertion tube front joint ring, the free ends of the elastic clamping heads are provided with barb parts which extend outwards and are used for being assembled with bent angle snake bones, the insertion tube rear joint ring is provided with elastic clamping holes symmetrically arranged along the insertion tube rear joint ring, and the elastic clamping holes and the operation handle connecting unit form precise transition fit. The invention replaces the structure mode of welding into a whole in the prior art, can form quick positioning clamping with the snake bone and the connecting handle, not only improves the assembly efficiency and the assembly precision, but also facilitates the subsequent maintenance, reduces the maintenance cost and improves the maintenance efficiency.

Inventors

  • SHI JIAN
  • XIE MINZHENG
  • XIE MENGLEI

Assignees

  • 常州延顺光电科技有限公司

Dates

Publication Date
20260508
Application Date
20260323

Claims (11)

  1. 1. An insertion tube assembly of a flexible endoscope traction spring tube comprises an insertion tube framework, a bent angle traction unit and an operation handle connection unit which are arranged at the head end and the tail end of the insertion tube framework, The insertion tube framework comprises a spring tube (11), a woven net tube (12) and a flexible protection hose (13), the woven net tube (12) is arranged at the periphery of the spring tube (11), the flexible protection hose (13) is arranged at the periphery of the woven net tube (12), The bent angle traction unit comprises an insertion pipe front joint ring (21) and an insertion pipe rear joint ring (22) which are arranged at the head end and the tail end of the woven mesh pipe (12), a traction spring pipe (23) fixed on the insertion pipe front joint ring (21) penetrates out of the operation handle connecting unit through a spring pipe (11), The method is characterized in that: the insertion tube front joint ring (21) is provided with elastic clamping heads (211) symmetrically arranged along the insertion tube front joint ring, the free end of the elastic clamping heads (211) is provided with a barb part (212) which extends outwards and is used for being assembled with the bent angle snake bone, The insertion tube rear joint ring (22) is provided with elastic clamping holes (221) symmetrically arranged along the insertion tube rear joint ring, and the elastic clamping holes (221) and the operation handle connecting unit form precise transition fit.
  2. 2. The flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein the elastic clamping head (211) is provided with an elastic connecting arm (213) which is connected with the insertion tube front joint ring (21) into a whole and is integrally formed by machining, the free end of the elastic connecting arm (213) is provided with an outwards extending barb part (212), and the outer edge surface of the barb part (212) is in a guide arc-shaped structure capable of forming guide positioning fit with the bent snake bone.
  3. 3. The flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein the insertion tube front joint ring (21) is of a step-shaped structure formed by a bent angle connecting part (214) and an insertion connecting part (215), the outer diameter of the insertion connecting part (215) is larger than that of the bent angle connecting part (214), the bent angle connecting part (214) is used for forming a shaft hole matching structure with a bent angle snake bone, the bent angle connecting part (214) is provided with an elastic clamping head (211), and the insertion connecting part (215) is sleeved at the head end of the weaving net tube (12).
  4. 4. The flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein two or four spring tube fixing grooves (216) which are arranged at equal intervals along the circumferential direction and are used for positioning and fixing the traction spring tube (23) are arranged on the bent angle connecting part (214) of the insertion tube front connecting ring (21).
  5. 5. The flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein two spring tube fixing grooves (216) for positioning and fixing the traction spring tube (23) are formed in the bent corner connecting portion (214) of the insertion tube front joint ring (21), the elastic clamping head (211) and the spring tube fixing grooves (216) are arranged separately along the circumferential direction of the insertion tube front joint ring (21), and one of the spring tube fixing grooves (216) is offset from the central axis of the insertion tube front joint ring (21) by 3-7 degrees.
  6. 6. The flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein a limiting annular table (222) connected with the insertion tube rear joint ring (22) is arranged on the periphery of the insertion tube rear joint ring (22), and two elastic clamping holes (221) symmetrically arranged along the two limiting annular table (222) and four soldering tin holes (223) uniformly arranged along the circumferential direction of the two elastic clamping holes and used for forming fixed connection with the woven mesh tube (12) are respectively arranged on the two sides of the limiting annular table (222).
  7. 7. The flexible endoscope traction spring tube insertion tube assembly of claim 1, wherein the elastic clamping head (211) is of a T-shaped structure as a whole, and the barb part (212) is of a rectangular structure or a semicircular structure.
  8. 8. A flexible endoscope traction spring tube insertion tube assembly according to claim 3, wherein a solder hole for forming a weld with the woven mesh tube (12) is formed in the circumferential direction of said insertion connection portion (215).
  9. 9. The flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein the operation handle connection unit comprises a fixing nut (41), an elastic adapter seat (42), a sealing conical sleeve (43) and an embedded piece (44), the fixing nut (41) is sleeved on the periphery of the insertion tube rear connecting ring (22) and is detachably connected with the elastic adapter seat (42), a limit annular table (222) on the periphery of the insertion tube rear connecting ring (22) is abutted against the inner wall of the fixing nut (41), the elastic adapter seat (42) is in precise transition fit with the elastic clamping hole (221), the operation handle (5) is in sealing connection with the elastic adapter seat (42) through a radial screw and a sealing ring, the sealing conical sleeve (43) is sleeved on the periphery of the flexible protection hose (13), and meanwhile, the operation handle (5) is connected with the sealing conical sleeve (43) through the embedded piece (44).
  10. 10. The flexible endoscope traction spring tube insertion tube assembly of claim 9, wherein the end portion of the elastic adapter (42) is provided with elastic adapter hooks (421) symmetrically arranged along the elastic adapter hooks, and the elastic adapter hooks (421) are clamped in elastic clamping holes (221) of the insertion tube rear joint ring (22).
  11. 11. A flexible endoscope traction spring tube insertion tube assembly according to claim 1, wherein said spring tube (11) is formed by winding two sections of steel strips with different hardness, so that the spring tube (11) is provided with a front section (111) and a rear section (112) which are connected into a whole, the thickness of the steel strip is 0.07 mm-0.11 mm, the width is 1.3 mm-2.1 mm, the hardness of the front section (111) of the spring tube (11) is smaller than the hardness of the rear section (112), the pitch of the front section (111) is 1.7 mm-2.5 mm, the pitch of the rear section (112) is 2.8 mm-3.4 mm, The braided net tube (12) coated on the periphery of the rear section (112) is coated with plastic, a polyurethane layer is formed after liquid polyurethane is solidified, and a polyurethane film protective layer (14) is further arranged on the periphery of the flexible protective hose (13).

Description

Insertion tube assembly of flexible endoscope traction spring tube Technical Field The invention relates to an insertion tube assembly, in particular to an insertion tube assembly of a flexible endoscope traction spring tube, and belongs to the technical field of endoscopes. Background Medical electronic or fiber soft choledochoscope is a high-tech medical instrument for diagnosing or treating benign and malignant diseases in common bile duct by minimally invasive surgery. At present, the domestic soft choledochoscope is small in diameter for installing forceps channel pipes, has a channel aperture of instruments such as biopsy forceps and the like of ∅ 1.6.6 mm or less, can only use the biopsy forceps with an outer diameter of ∅ 1.2.2 mm or ∅ 1.5.5 mm or less, has small diameter for instrument accessories such as stone extraction blue and the like, is inconvenient to operate and use at times, and is difficult to extract stone. The prior choledochoscope insertion tube assembly has the defects that the outer diameter is thicker, the aperture is smaller, a thicker forceps channel tube cannot be installed, the hole of a working channel of a thinner forceps channel is smaller, a thicker minimally invasive surgical accessory of the related choledochoscope cannot pass through the working channel of the choledochoscope, a larger minimally invasive surgical instrument such as a choledochoscope cannot be used, a common bile duct and other positions cannot be entered, diseases in a biliary tract region are required to be rapidly checked and diagnosed, and the like are difficult to take out a larger choledocholelithiasis. And the connection between the angle bending unit and the front ring of the insertion tube and the connection between the rear ring of the insertion tube and the handle in the prior art, or the method of directly welding the angle bending unit and the front ring of the insertion tube and the rear ring of the insertion tube into a whole by adopting a steel sleeve ring, the method has the defects of more assembly and production labor, long production period, high production cost, long time for maintaining and disassembling the choledochoscope, high maintenance cost and the like. Disclosure of Invention The invention aims to provide the insertion tube assembly of the flexible endoscope traction spring tube, which replaces the welding integrated structure mode in the prior art, can form quick positioning clamping with the snake bone and the connecting handle, not only improves the assembly efficiency and the assembly precision, but also facilitates subsequent maintenance and reduces the maintenance cost. In order to achieve the aim, the technical proposal of the invention is that an insertion tube assembly of a flexible endoscope traction spring tube comprises an insertion tube framework, and a bent angle traction unit and an operation handle connecting unit which are arranged at the head end and the tail end of the insertion tube framework, The insertion tube framework comprises a spring tube, a woven net tube and a flexible protective hose, the woven net tube is arranged at the periphery of the spring tube, the flexible protective hose is positioned at the periphery of the woven net tube, The bent angle traction unit comprises an insert tube front joint ring and an insert tube rear joint ring which are arranged at the head end and the tail end of the woven mesh tube, a traction spring tube fixed on the insert tube front joint ring passes through the spring tube and penetrates out of the operation handle connecting unit, The innovation point is that: The front joint ring of the insertion tube is provided with elastic clamping heads which are symmetrically arranged along the front joint ring, the free ends of the elastic clamping heads are provided with barb parts which extend outwards and are used for being assembled with the bent angle snake bones, The rear joint ring of the insertion tube is provided with elastic clamping holes which are symmetrically arranged along the rear joint ring, and the elastic clamping holes and the operation handle connecting unit form precise transition fit. In the above technical scheme, the elastic clamping head is provided with an elastic connecting arm which is connected with the front connecting ring of the insertion tube into a whole and is integrally formed through machining, the free end of the elastic connecting arm is provided with an outwards extending barb part, and the outer edge surface of the barb part is in a guiding arc-shaped structure which can form guiding and positioning fit with the bent angle snake bone. In the above technical scheme, the insert tube front joint ring is a step-shaped structure formed by a bent angle connecting part and an insert connecting part, the outer diameter of the insert connecting part is larger than that of the bent angle connecting part, the bent angle connecting part is used for forming a shaft hole matching structure with