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CN-122006080-A - Integrated optical fiber pressure sensing guide wire based on Archimedes ring structure

CN122006080ACN 122006080 ACN122006080 ACN 122006080ACN-122006080-A

Abstract

The invention discloses an integrated optical fiber pressure sensing guide wire based on an Archimedes ring structure, which relates to the field of medical equipment, and comprises a proximal pushing section, a transition section and a head end sensing section which are sequentially arranged from a proximal end to a distal end, wherein a core wire is arranged inside the guide wire, and the integrated optical fiber pressure sensing guide wire also comprises an Archimedes spiral skeleton which is arranged on the head end sensing section; the invention can effectively eliminate the generation mechanism of the wall attachment artifact, improve the accuracy and reliability of blood pressure measurement, reduce the calibration times in operation and shorten the operation time by arranging an Archimedes spiral skeleton on a sensing section of the wire guiding end and fixing the optical fiber pressure sensor at the middle section of the skeleton.

Inventors

  • XIAO DISHENG

Assignees

  • 万漉医疗科技(江苏)有限公司

Dates

Publication Date
20260512
Application Date
20260309

Claims (10)

  1. 1. The utility model provides an integrated optic fibre pressure sensing seal wire based on archimedes ring structure, includes proximal end propelling movement section, changeover portion and the head end sensing section that sets gradually from the proximal end to the distal end, the seal wire inside is provided with the core silk, the core silk runs through proximal end propelling movement section with changeover portion, its characterized in that still includes: An archimedes spiral skeleton disposed on the head end sensing segment, the archimedes spiral skeleton being adapted to expand upon release into a blood vessel to adaptively position at least a portion of the head end sensing segment at a central region of the blood vessel by symmetrical radial elastic support forces thereof; an optical fiber pressure sensor fixed at the middle section of the Archimedes spiral skeleton for sensing the fluid pressure at the position; The composite probe is arranged at the most distal end of the guide wire and is used for sensing a three-dimensional contact force vector when the end of the guide wire head is in contact with tissues; The Archimedes spiral skeleton cooperates with the composite probe to provide spatial position information and mechanical contact state information of the guide wire head end in a blood vessel.
  2. 2. The integrated optical fiber pressure sensing guide wire based on an Archimedes loop structure according to claim 1, wherein the Archimedes spiral skeleton is made of super-elastic material, and the outer diameter of the free state of the Archimedes spiral skeleton is slightly larger than the expected diameter of a target blood vessel.
  3. 3. The integrated optical fiber pressure sensing guide wire based on the Archimedes loop structure of claim 2, wherein the Archimedes spiral skeleton is a two-dimensional plane spiral structure formed by a nickel-titanium alloy wire through a heat setting process, and the spiral plane is perpendicular to the axis of the guide wire.
  4. 4. The integrated optical fiber pressure sensing guide wire based on the Archimedes loop structure of claim 3, wherein the Archimedes spiral skeleton is fixedly connected with the core material of the transition section through the inner end of the Archimedes spiral skeleton, and the outer end of the Archimedes spiral skeleton is a free end.
  5. 5. The integrated optical fiber pressure sensing guide wire based on an Archimedes loop structure according to claim 1, wherein the optical fiber pressure sensor is an optical fiber F-P interference type sensor which is fixedly connected to the outer side of the middle ring of the Archimedes spiral framework through a biocompatible adhesive, and the plane of the pressure sensing membrane is parallel to the spiral plane and faces the blood flow direction.
  6. 6. The integrated optical fiber pressure sensing guide wire based on the Archimedes loop structure of claim 1, wherein the composite probe comprises a micro-cantilever beam formed at the end part of a single-mode fiber, and at least three fiber grating sensors arranged on the circumference of the root part of the micro-cantilever beam and used for resolving a three-dimensional force vector.
  7. 7. The integrated optical fiber pressure sensing guidewire based on the Archimedes loop structure of claim 1, wherein the outer surface of the proximal pushing section is provided with a hydrophilic coating.
  8. 8. The integrated optical fiber pressure sensing guidewire based on the Archimedes loop structure of claim 1 wherein the body of the head end sensing section is composed of a polymeric material.
  9. 9. The integrated optical fiber pressure sensing guide wire based on the Archimedes loop structure of claim 1 is characterized in that a streamline front guide head is arranged at the free end of the outermost ring of the Archimedes spiral skeleton, and the streamline front guide head is made of polyurethane.
  10. 10. The integrated optical fiber pressure sensing guide wire based on the Archimedes loop structure of claim 1, wherein the sensing optical fiber for connecting the optical fiber pressure sensor and the composite probe passes through the transition section and the channel inside the proximal pushing section from the head end sensing section and finally is led out from the proximal end of the guide wire.

Description

Integrated optical fiber pressure sensing guide wire based on Archimedes ring structure Technical Field The invention relates to the technical field of medical instruments, in particular to an integrated optical fiber pressure sensing guide wire based on an Archimedes ring structure. Background In intravascular diagnosis and treatment processes such as percutaneous coronary intervention treatment, it is important to accurately acquire intravascular hemodynamic parameters in real time. For example, fractional coronary flow reserve measurements are gold criteria that assess the functional significance of coronary stenosis, which rely on accurate measurement of the distal and proximal pressures of the stenosis. Such as the dynamic and complex environment of the intracranial vessels, the periodic pulsations of the heart, the tortuous anatomy of the intracranial vessels, and the pulsatile nature of the blood flow, pose significant challenges to the measurement instruments placed therein. Currently, pressure guidewires used clinically often integrate miniature pressure sensors at their head ends, such as pressure guidewires based on fiber optic sensing technology. These sensors are typically directly exposed to the end surface of the spinneret and function by sensing the change in fluid pressure at the location of the sensor. To obtain accurate measurements, the operator needs to repeatedly adjust the guidewire position during operation, try to center the sensor in the lumen of the blood vessel and away from the vessel wall, and then perform a zeroing calibration operation. The prior art solutions focus mainly on miniaturization and sensitivity enhancement of the sensor, or on integrating a single type of fiber optic sensor on a coaxial structure. However, the pressure sensor at the top end of the existing guide wire is very easy to be abutted against the vessel wall in the pushing process or under the impact of blood flow due to the small diameter of the head end. When the sensor is in contact with the vessel wall, it is mechanically squeezed by the vessel wall, producing an artifact that is far higher than the true blood flow pressure, i.e. an adherence artifact. And further, the pressure measurement value is seriously distorted, so that an operator is forced to interrupt the operation flow, repeatedly adjust the guide wire and frequently execute zero-resetting calibration, the operation time is prolonged, the operation complexity is increased, and the accuracy of diagnosis and treatment decision can be possibly influenced. Second, the mechanical effects in the intracranial intravascular environment are multiple, and the spinneret end may be subjected to both axial pressure from the blood flow, radial compressive forces from the vessel wall, and shear forces due to motion. The traditional single-point or coaxial single-layer fiber bragg grating sensor is difficult to decouple the mechanical components which are co-point in space but have different directions, so that the feedback signal is blurred. The operator cannot accurately judge whether the guide wire head end is in an ideal free floating state or is propped against the vascular bifurcation or is rubbed with the vascular side wall, and the vector sensing capability of the interaction force between the guide wire tip and the tissue is lacked. Accordingly, there is a need for an improvement over the deficiencies of the prior art guidewires to address the above-described issues. Disclosure of Invention The invention overcomes the defects of the prior art, provides an integrated optical fiber pressure sensing guide wire based on an Archimedes loop structure, and realizes centralized space positioning through an Archimedes spiral skeleton, and is combined with multidimensional mechanical navigation information provided by a composite probe, so that the guide wire can clearly distinguish whether a sensor is positioned at a central position free from interference or not and a specific mechanical state when the guide wire head contacts a tissue, thereby realizing the two-dimensional accurate positioning and sensing of space and mechanics. In order to achieve the above purpose, the invention adopts the technical scheme that in the first aspect, the invention provides an integrated optical fiber pressure sensing guide wire based on an Archimedes loop structure, which comprises a proximal pushing section, a transition section and a head end sensing section which are sequentially arranged from a proximal end to a distal end, wherein a core wire is arranged in the guide wire, and penetrates through the proximal pushing section and the transition section, and the integrated optical fiber pressure sensing guide wire further comprises: An archimedes spiral skeleton disposed on the head end sensing segment, the archimedes spiral skeleton being adapted to expand upon release into a blood vessel to adaptively position at least a portion of the head end sensing segment at a