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CN-115666702-B - Catheter tube

CN115666702BCN 115666702 BCN115666702 BCN 115666702BCN-115666702-B

Abstract

The present invention aims to provide an asymmetric curved catheter, wherein the curved shape of the distal part of the catheter is different from the curved shape of the distal part of the catheter. The catheter comprises a shaft, a 1 st wire and a 2 nd wire, a leaf spring configured to separate a lumen of the shaft into a 1 st portion configured by the 1 st wire and a 2 nd portion configured by the 2 nd wire, a support member, and a 1 st coil having a lumen configured by the 1 st wire, the 1 st coil being fixed to a proximal end side of the leaf spring at least two places, the 1 st coil having a total length L 1 in a natural state and a total length L C1 at a maximum compression, and a ratio L C1 /L 1 of them being 0.9 or more.

Inventors

  • Toshiya Musa

Assignees

  • 株式会社钟化

Dates

Publication Date
20260512
Application Date
20210527
Priority Date
20200604

Claims (15)

  1. 1. A catheter, characterized by comprising: A shaft having a distal end and a proximal end, and having a lumen extending in a length direction; A 1 st line and a 2 nd line, the 1 st line and the 2 nd line having a distal end and a proximal end, the distal end being fixed to the distal end of the shaft, the proximal end being disposed at the proximal end of the shaft, the 1 st line and the 2 nd line extending within the lumen of the shaft; A leaf spring disposed in the inner cavity of the shaft so as to separate the inner cavity of the shaft in the longitudinal direction into a 1 st portion in which the 1 st wire is disposed and a 2 nd portion in which the 2 nd wire is disposed; A support member extending in the longitudinal direction and having an inner cavity in which the 1 st and 2 nd wires are disposed, the support member fixing a proximal end of the leaf spring, the support member being disposed closer to a position side than the leaf spring, and A1 st coil having a lumen in which the 1 st wire is disposed, and disposed in the 1 st section on a distal side from a distal end of the support member, Wherein, the The 1 st coil is fixed to a proximal end side of the leaf spring at least at two places, the 1 st coil has a 1 st fixing portion as a portion fixing the 1 st coil to the leaf spring, a 2 nd fixing portion located closer to a position side than the 1 st fixing portion and as a portion fixing the 1 st coil to the leaf spring, and an intermediate non-fixing portion located between the 1 st fixing portion and the 2 nd fixing portion and as a portion not fixed to the leaf spring, The 1 st coil has a natural full length L 1 and a maximum compression full length L C1 , and a ratio L C1 /L 1 of them is 0.9 or more.
  2. 2. The catheter of claim 1, wherein the catheter is configured to receive a catheter, The support member is a proximal tube.
  3. 3. A catheter as claimed in claim 1 or 2, wherein, The 1 st coil is non-compressed.
  4. 4. A catheter as claimed in claim 1 or 2, wherein, The portion fixing the 1 st coil to the leaf spring is located on a surface of the 1 st coil facing one surface of the leaf spring.
  5. 5. A catheter as claimed in claim 1 or 2, wherein, The non-fixed portion of the 1 st coil, that is, the non-fixed portion having the longest length in the longitudinal direction is configured to have a length in the natural state of the longitudinal direction of 50% or more of the total length L 1 in the natural state of the 1 st coil.
  6. 6. A catheter as claimed in claim 1 or 2, wherein, The 1 st coil further has a distal-side non-fixing portion between a distal end of the 1 st coil and the 1 st fixing portion, the distal-side non-fixing portion having no fixing portion for fixing the 1 st coil to the leaf spring.
  7. 7. A catheter as claimed in claim 1 or 2, wherein, Further provided with a2 nd coil which is provided with a second coil, The 2 nd coil has a lumen in which the 1 st wire is disposed, and is disposed in the 1 st section at a position on a far side from the 1 st coil.
  8. 8. The catheter of claim 7, wherein the catheter is configured to receive a catheter, The 2 nd coil has a full length L 2 in natural state and a full length L C2 at maximum compression, and their ratio L C2 /L 2 is less than 0.9.
  9. 9. The catheter of claim 7, wherein the catheter is configured to receive a catheter, The bending rigidity of the 1 st coil is greater than the bending rigidity of the 2 nd coil, and the difference between the bending rigidity of the 1 st coil and the bending rigidity of the 2 nd coil is 50% or less.
  10. 10. The catheter of claim 7, wherein the catheter is configured to receive a catheter, The 1 st coil includes a1 st coil wire spirally wound, The 2 nd coil includes a2 nd coil wire spirally wound, The 1 st coil has a pitch interval smaller than that of the 2 nd coil.
  11. 11. The catheter of claim 10, wherein the catheter is configured to receive a catheter, The coil wire diameter and the coil diameter of the 1 st coil are the same as the coil wire diameter and the coil diameter of the 2 nd coil.
  12. 12. A catheter as claimed in claim 1 or 2, wherein, Further provided with a3 rd coil which is provided with a third coil, The 3 rd coil has an inner cavity in which the 2 nd wire is disposed, and is disposed in the 2 nd section.
  13. 13. The catheter of claim 12, wherein the catheter is configured to receive a catheter, The 3 rd coil has a full length L 3 in natural state and a full length L C3 at maximum compression, and their ratio L C3 /L 3 is less than 0.9.
  14. 14. A catheter as claimed in claim 1 or 2, wherein, The device comprises a2 nd coil, wherein the 2 nd coil is provided with an inner cavity for arranging the 1 st wire and is arranged at a position far away from the 1 st coil of the 1 st part, Comprises a3 rd coil, wherein the 3 rd coil is provided with an inner cavity for the 2 nd wire to be arranged and is arranged at the 2 nd part, The catheter further includes a protective tube having an inner cavity and disposed in the shaft inner cavity, and the leaf spring, the 1 st coil, the 2 nd coil, and the 3 rd coil are disposed in the inner cavity of the protective tube.
  15. 15. A catheter as claimed in claim 1 or 2, wherein, The 1 st coil fixes the 1 st fixing portion and the 2 nd fixing portion by welding, soldering, bonding or crimping.

Description

Catheter tube Technical Field The present invention relates to a catheter having a bendable distal end. Background For measuring the potential in the heart or performing pacing, an electrode catheter having a plurality of electrodes in a distal portion is used. In such catheters with electrodes, there are catheters in which the distal portion of the catheter can be bent by a handle operation so that the distal portion can be easily placed at a desired position in the heart. Such catheters are typically capable of bending the distal portion of the catheter by pulling a pull wire that is secured within the distal end of the catheter. In addition, a catheter having 2 wires for bending the catheter to one side or both sides of the other side around the longitudinal direction of the catheter has been proposed. For example, patent document 1 discloses a catheter having a tip capable of being biased to operate, which is provided with a plurality of operation tubes in which an operation wire is disposed in a lumen of a tube of the catheter, and the operation tube is divided into a plurality of partial tubes, whereby the tip portion of the catheter can be deformed into a smoothly curved shape that is not bent halfway. There have also been proposed catheters in which the distal end of the catheter can be biased to operate without bending the distal end of the catheter, a leaf spring disposed inside the distal end of the catheter, and a pull wire coming off (patent documents 2 and 3), and catheters in which the shape of the distal end is different from the shape of the distal end of the catheter. Patent document 1 Japanese patent application laid-open No. 2012-200445 Patent document 2 Japanese patent application laid-open No. 2010-75530 Patent document 3 Japanese patent application laid-open No. 2015-100515 Patent document 4 Japanese patent application laid-open No. 2012-147971 Patent document 5 Japanese patent application laid-open No. 2017-518122 In order to match the size and purpose of the heart, it is required to form an asymmetric bending type catheter in which the catheter distal portion is bent to either one side or the other side, and the bending diameters of the catheter distal portion are different from each other. In addition, by increasing the degree of asymmetry of the bending, the distal portion of the catheter can be easily delivered to a desired location. However, in the structures of patent documents 4 and 5, it is difficult to form a catheter having a higher degree of asymmetry of the bending diameter. Disclosure of Invention The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an asymmetric bending type catheter in which a distal portion of the catheter can be bent to either one side or the other side, and the bending shapes of the distal portion are different from each other. The catheter capable of solving the above problems is characterized by comprising a shaft having a distal end and a proximal end and having a lumen extending in a longitudinal direction; lines 1 and 2, the lines 1 and 2 having a distal end and a proximal end, the distal end being fixed to the distal end of the shaft, the proximal end being disposed at the proximal end of the shaft, the lines 1 and 2 extending within the lumen of the shaft; the compression spring comprises a leaf spring arranged in an inner cavity of a shaft so as to divide the inner cavity of the shaft into a 1 st part arranged by a 1 st line and a 2 nd part arranged by a 2 nd line in a longitudinal direction, a support member extending in the longitudinal direction and having an inner cavity arranged by the 1 st line and the 2 nd line, the support member fixing a proximal end of the leaf spring, the support member being arranged at a position closer to a position side than the leaf spring, and a 1 st coil having an inner cavity arranged by the 1 st line and being arranged in the 1 st part at a position farther from a distal end of the support member, wherein the 1 st coil has a 1 st fixing part as a part for fixing the 1 st coil to the leaf spring, a 2 nd fixing part as a part for fixing the 1 st coil to the leaf spring, and an intermediate non-fixing part as a part for non-fixing the 1 st coil, and the 1 st coil has a total length of 1 L and a total length of C1/L1 when the 1 st coil is compressed at least in a natural state of 5324 and a maximum L. Preferably, the support member is a proximal tube. Preferably, the 1 st coil is non-compressed. The portion where the 1 st coil and the leaf spring are fixed is preferably located on a surface of the 1 st coil facing one surface of the leaf spring. The non-fixed portion of the 1 st coil, that is, the non-fixed portion having the longest length in the longitudinal direction is preferably configured such that the length in the natural state of the 1 st coil is 50% or more of the total length L 1 in the natural state of the 1 st coil. The 1 st coil pr