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CN-121987924-A - A adjustable curved hemostasis conveying sheath pipe for aortic arch portion interventional therapy

CN121987924ACN 121987924 ACN121987924 ACN 121987924ACN-121987924-A

Abstract

The invention provides an adjustable bending hemostasis conveying sheath tube for aortic arch interventional therapy, which comprises a catheter sheath and a control mechanism, wherein the control mechanism comprises a base, a driving assembly and a locking assembly, the driving assembly comprises a driving ring rotatably arranged on the base and a transmission sliding block in threaded fit with the driving ring, the transmission sliding block is fixedly connected with the proximal end of an adjusting wire and is limited to axially slide relative to the base, the locking assembly is arranged between the base and a connecting part, the locking assembly comprises a clamping block sleeved outside the adjusting wire and a sliding ring sleeved outside the clamping block in an axially sliding manner, and the clamping type friction force generated by a plurality of elastic clamping arms is extruded through the sliding ring, so that the adjusting wire can be locked extremely reliably.

Inventors

  • WANG LIXIN
  • FU WEIGUO
  • HUANG YULONG
  • XIE CHENGZHI
  • ZHANG YULI
  • Fang Hanji

Assignees

  • 上海浦东复旦大学张江科技研究院
  • 复旦大学附属中山医院

Dates

Publication Date
20260508
Application Date
20260410

Claims (8)

  1. 1. An adjustable bend hemostatic delivery sheath for aortic arch interventional procedures, comprising: The catheter sheath (100), the catheter sheath (100) comprises a sheath body (110) and a connecting part (120) which are connected, the sheath body (110) is connected with a catheter body (1001), and an adjusting wire (1002) is arranged in the catheter body (1001); A control mechanism (200), the control mechanism (200) being mounted to the connection portion (120) for controlling bending of the distal end of the catheter body (1001), the control mechanism comprising: -a base (210), said base (210) being provided with a channel (2101) for the passage of said adjusting wire (1002); -a drive assembly (220), said drive assembly (220) comprising a drive ring (223) rotatably mounted on said base (210) and a transmission slide (222) threadedly engaged with said drive ring (223), said transmission slide (222) being fixedly connected to a proximal end of said adjustment wire (1002) and being constrained to slide axially relative to said base (210); the locking assembly (230) is arranged between the base (210) and the connecting part (120), and the locking assembly (230) comprises a clamping block (234) sleeved outside the adjusting wire (1002) and a sliding ring (232) sleeved outside the clamping block (234) in an axially sliding manner; The inner diameter of the sliding ring (232) varies in the axial direction, when the sliding ring (232) moves in the direction toward the base (210), the clamping block (234) is pressed to radially contract to clamp the adjusting wire (1002), and when the sliding ring (232) moves reversely, the pressing is released to release the adjusting wire (1002).
  2. 2. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures of claim 1, wherein the drive assembly (220) further comprises a guide block (221) secured to the base (210), the guide block (221) having a guide chute (2211) thereon; and a limiting block (2222) which is in sliding fit with the guide chute (2211) is arranged on the transmission sliding block (222).
  3. 3. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures according to claim 2, wherein a guide slot (2201) is formed between two adjacent guide blocks (221); The transmission sliding block (222) is provided with a transmission block (2221) which is in sliding fit with the guide groove (2201); The driving ring (223) is rotatably sleeved outside the guide block (221), an inner thread is arranged on the inner wall of the driving ring (223), and an outer thread meshed with the inner thread is arranged on the outer side surface of the transmission block (2221).
  4. 4. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures of claim 1, wherein the locking assembly (230) further comprises a connection ring (231), the connection ring (231) being connected between the connection portion (120) and the base (210); An operation part (2321) is arranged on the periphery of the sliding ring (232), and a guide window (2312) which is in sliding fit with the operation part (2321) is arranged on the connecting ring (231).
  5. 5. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures as set forth in claim 4, wherein the operating portion (2321) is provided with an elastic protrusion (2322), and a groove (2313) is provided on a side wall of the guide window (2312) and mates with the elastic protrusion (2322).
  6. 6. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures of claim 1, wherein the clamp block (234) comprises a plurality of circumferentially distributed resilient clamp arms that collectively enclose a clamp hole (2341) for passing through the adjusting wire (1002).
  7. 7. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures of claim 1, further comprising a hemostatic assembly (300), the hemostatic assembly (300) disposed at a proximal end of the sheath body (110); The hemostatic assembly (300) includes a connector housing (310) coupled to the sheath body (110), and an annular balloon (320) disposed within the connector housing (310) and controllably expandable and contractible.
  8. 8. The adjustable bend hemostatic delivery sheath for aortic arch interventional procedures of claim 7, wherein the hemostatic assembly (300) further comprises a inflation and deflation channel (330) in communication with the balloon (320), the inflation and deflation channel (330) having a control valve (333) disposed thereon.

Description

A adjustable curved hemostasis conveying sheath pipe for aortic arch portion interventional therapy Technical Field The invention relates to the technical field of sheaths, in particular to an adjustable bending hemostatic delivery sheath for aortic arch interventional therapy. Background Endoluminal interventions have become an important treatment for aortic arch diseases (e.g. aortic dissection, aneurysms, etc.). In such procedures, it is often necessary to create a vascular access by percutaneous puncture and deliver devices such as thoracic aortic stents to the targeted lesion site through a delivery sheath. The core function of the delivery sheath is to provide access to the body for the interventional instrument and to provide the necessary support, guidance and protection during delivery. In the interventional therapy of complex anatomical regions such as aortic arch, it is generally necessary that the delivery sheath have the ability to controllably bend distally to conform to the natural curvature of the vessel, thereby enabling delivery and release of the interventional instrument. For example, chinese patent CN114177477B discloses a bending device that uses a pull wire to pull the distal end of the sheath to bend. Specifically, bending is achieved by manually pulling the pull wire from the outside, causing the pull wire to exert a lateral pulling force on the bendable section of the sheath. This solution relies on manual pulling of the pull wire for bending adjustment and the device lacks an effective locking mechanism to maintain the bent state after bending adjustment is completed. In the subsequent instrument conveying or adjusting process, the bending angle may be loosened or rebound due to push-pull of the instrument, blood flow impact or catheter tension release, so that the set shape cannot be maintained, and the stability is poor. Disclosure of Invention The invention aims at overcoming the defects in the prior art, and provides an adjustable bending hemostasis conveying sheath tube for aortic arch interventional therapy, so as to solve the problem of poor bending stability in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: An adjustable bend hemostatic delivery sheath for aortic arch interventional procedures, comprising: the catheter sheath comprises a sheath body and a connecting part which are connected, wherein the sheath body is connected with a catheter body, and an adjusting wire is arranged in the catheter body; the control mechanism is arranged on the connecting part and used for controlling the bending of the far end of the catheter body, and comprises: the base is provided with a channel for the adjusting wire to pass through; the driving assembly comprises a driving ring rotatably mounted on the base and a transmission sliding block in threaded fit with the driving ring, and the transmission sliding block is fixedly connected with the proximal end of the adjusting wire and is limited to axially slide relative to the base; The locking assembly is arranged between the base and the connecting part and comprises a clamping block sleeved outside the adjusting wire and a sliding ring sleeved outside the clamping block in an axially sliding manner; The inner diameter of the sliding ring is changed in the axial direction, when the sliding ring moves in the direction towards the base, the clamping block is pressed to be radially contracted to clamp the adjusting wire, and when the sliding ring moves reversely, the pressing is released to release the adjusting wire. As a preferred embodiment, the driving assembly further comprises a guide block fixed on the base, and a guide chute is arranged on the guide block; and a limiting block which is in sliding fit with the guide chute is arranged on the transmission sliding block. As a preferred embodiment, a guide groove is formed between two adjacent guide blocks; The transmission block is arranged on the transmission slide block and is in sliding fit with the guide groove; The driving ring is rotatably sleeved outside the guide block, an inner thread is arranged on the inner wall of the driving ring, and an outer thread meshed with the inner thread is arranged on the outer side surface of the transmission block. As a preferred embodiment, the locking assembly further comprises a connection ring connected between the connection portion and the base; the periphery of the sliding ring is provided with an operation part, and the connecting ring is provided with a guide window which is in sliding fit with the operation part. As a preferred embodiment, the operation part is provided with an elastic bulge, and the side wall of the guiding window is provided with a groove matched with the elastic bulge. As a preferred embodiment, the clamping block comprises a plurality of elastic clamping arms distributed along the circumferential direction, and the plurality of elastic clampin