Cold snare

Patent metadata

Field	Value
Publication number	US-2023310023-A1
Application number	US-202318332537-A
Country	US
Kind code	A1
Filing date	Jun 9, 2023
Priority date	Dec 15, 2020
Publication date	Oct 5, 2023
Grant date	—

Abstract

A cold snare includes a spring tube, a drive wire, and a loop. The cable passes through the spring tube, and can perform reciprocating motion in a direction of a longitudinal axis of the spring tube. The loop is fixedly connected to a distal end of the drive wire. Therefore, when the drive wire performs reciprocating motion in the direction of the longitudinal axis of the spring tube, the loop synchronously performs reciprocating motion in the direction of the longitudinal axis of the spring tube along with the drive wire to achieve the purpose of controlling the loop to enter and exit the spring tube by the drive wire. By using a spring tube as an outer tube, the strength of the spring tube is higher than that of a plastic outer tube of an existing cold snare, which is helpful for the loop to cut when grabbing large polyps.

First claim

What is claimed is:

1 . A cold snare, comprising:
a spring tube ( 111 ); a drive wire ( 130 ), passing through the spring tube ( 111 ), and performing a reciprocating motion in a direction of a longitudinal axis ( 170 ) of the spring tube ( 111 ); and a loop ( 140 ), fixedly connected to a distal end of the drive wire ( 130 ), and motion of the drive wire ( 130 ) being used to manipulate the loop ( 140 ) to enter and exit the spring tube ( 111 ).

2 . The cold snare according to claim 1 , wherein the cold snare ( 100 ) further comprises an end member ( 150 ) fixedly connected to a distal end of the spring tube ( 111 ), the end member ( 150 ) has an inner hole ( 151 ) in communication with the spring tube ( 111 ); the loop ( 140 ) enters and exits the spring tube ( 111 ) through the inner hole ( 151 ).

3 . The cold snare according to claim 2 , wherein a proximal end of the end member ( 150 ) holds the distal end of the spring tube ( 111 ) and a distal end of the end member ( 150 ) is a contraction port.

4 . The cold snare according to claim 2 , wherein a distance between a merger point ( 148 ) and an opening ( 149 ) of the loop ( 140 ) is 5-15 mm.

5 . The cold snare according to claim 2 , wherein the end member ( 150 ) has a distal end face ( 153 ) and an inner circumferential surface corresponding to the inner hole ( 151 ), and a round corner ( 152 ) is arranged between the distal end face ( 153 ) and the inner circumferential surface.

6 . The cold snare according to claim 2 , wherein the end member ( 150 ) is made of a metal.

7 . The cold snare according to claim 1 , wherein the loop ( 140 ) is made of a nickel-titanium alloy.

8 . The cold snare according to claim 7 , wherein the loop ( 140 ) is a single wire structure.

9 . The cold snare according to claim 8 , wherein the wire has a round, square or flat cross section.

10 . The cold snare according to claim 7 , wherein the loop ( 140 ) comprises a first ring segment ( 143 ), a necking segment ( 144 ) and a second ring segment ( 145 ) connected sequentially; the first ring segment ( 143 ) has a first intersection point ( 146 ) connected with the necking segment ( 144 ), and the first ring segment ( 143 ) is in a streamlined shape with smooth transition from a proximal end of the first ring segment ( 143 ) to the first intersection point ( 146 ); the second ring segment ( 145 ) has a second intersection point ( 147 ) connected with the necking segment ( 144 ), and the second ring segment ( 145 ) is in a streamlined shape with smooth transition from a proximal end of the second ring segment ( 145 ) to the second intersection point ( 147 ).

11 . The cold snare according to claim 7 , wherein the loop ( 140 ) is in water drop or oval shape.

12 . The cold snare according to claim 1 , wherein the cold snare ( 100 ) further comprises a riveted tube ( 160 ), an outer circumferential surface of the riveted tube ( 160 ) is a cylindrical surface, the distal end of the drive wire ( 130 ) is fixedly connected into the riveted tube ( 160 ), and a proximal end of the loop ( 140 ) is fixedly connected into the riveted tube ( 160 ).

13 . The cold snare according to claim 1 , wherein the cold snare ( 100 ) further comprises an outer skin ( 112 ) cladding on outside of the spring tube ( 111 ).

14 . The cold snare according to claim 13 , wherein the outer skin ( 112 ) comprises a polymer tube.

15 . The cold snare according to claim 1 , wherein a distal end of the spring tube ( 111 ) is further provided with a scale ( 113 ) for measuring a size of a polyp to be cut.

16 . The cold snare according to claim 1 , wherein the spring tube ( 111 ) comprises a flexible metal tube or an elastic metal tube.

17 . The cold snare according to claim 16 , wherein the flexible metal tube or the elastic metal tube comprises any one of a metal wire wound spring tube ( 1111 ) and a spirally cut metal tube such as a spirally cut stainless steel tube ( 1112 ), or a combination of them.

Assignees

• Micro Tech Nanjing Co Ltd

Inventors

• Wei Jianyu
• Shen Zhenghua
• Zhang Feng
• Ll Changqing
• Leng Derong
• Haack Scott
• Tang Zhi
• Hou Zhengping
• Wu Lei
• Jin Hongyan

Classifications

• A61B17/32056 Primary

  Surgical snare instruments (for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26) · CPC title

• A61B17/320016 Primary

  Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes (A61B10/0233, A61B17/29, A61B17/3207 take precedence) · CPC title

• A61B2017/00269

  endoscopic mucosal resection EMR · CPC title