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KR-20260062978-A - CATHETER SYSTEM AND INTRAVASCULAR BLOOD PUMP COMPRISING SAID CATHETER SYSTEM

KR20260062978AKR 20260062978 AKR20260062978 AKR 20260062978AKR-20260062978-A

Abstract

The present invention relates to a catheter (20) which may be part of an intravascular blood pump, wherein the catheter includes a kink sensor that extends along the entire length of the catheter and includes an optical fiber (28A). The optical fiber is connected to an evaluation device (100), and the evaluation device evaluates a preset amount of light induced through the optical fiber to detect whether a portion of the amount of light is coupled and separated from the optical fiber along the length of the optical fiber. This is interpreted and indicated as a twist event. The optical fiber used in the kink sensor is preferably an optical fiber of an optical pressure sensor.

Inventors

  • 스패니어, 게르트
  • 지이스, 토르스텐

Assignees

  • 아비오메드 유럽 게엠베하

Dates

Publication Date
20260507
Application Date
20130425
Priority Date
20120427

Claims (10)

  1. A system comprising a catheter (10; 26) having a kink sensor (28A, 100), The above system is part of an intravascular blood pump, and the kink sensor comprises at least one optical fiber (28A), the optical fiber (28A) is part of an optical pressure sensor (30-34), and the kink sensor has a sensor head (30) firmly connected to the blood pump, and the optical fiber (28A) of the catheter (10; 26) determines whether a portion of a preset amount of light is coupled out from the optical fiber along the length of the optical fiber. Attached to an evaluation device (100) arranged to evaluate the amount of light transmitted through the optical fiber (28A) above System.
  2. In claim 1, the kink sensor extends along the entire length of the catheter (10; 26). A system that is extended and positioned to detect kinking of the catheter along the entire length of the catheter.
  3. In claim 1 or 2, the optical fiber is a system having segments having different optical transmission characteristics.
  4. In claim 1 or 2, the kink sensor is a system having a plurality of optical fibers of different lengths.
  5. In any one of claims 1 to 4, the optical fiber (28A) comprises a glass fiber. A system having a diameter of 120㎛ or less.
  6. In any one of claims 1 to 4, the optical fiber (28A) comprises a plastic fiber and has a diameter of 250 μm or less.
  7. In any one of claims 1 to 6, the optical fiber (28A) is freely movable in a lumen (20; 27) made of a material including a shape-memory alloy. Deployed system.
  8. A system according to any one of claims 1 to 6, wherein the optical fiber (28A) is freely movably disposed in a lumen (20; 27) made of a polymer material with an internal wear-resistant coating.
  9. In any one of claims 1 to 8, the pressure sensor (30-34) is disposed on a soft flexible tip (55) at the end of the catheter (10). A system having a sensor head (30).
  10. In any one of claims 1 to 9, the evaluation device (100) is a system configured to generate an alarm when the combined separated portion of the light amount reaches or exceeds a preset limit value.

Description

Catheter system and intravascular blood pump comprising said catheter system The present invention generally relates to a system comprising a catheter, in particular a pressure measuring catheter, and in particular to an intravascular blood pump having such a catheter system. WO 2011/039091 A1 describes a pressure measuring catheter having a catheter hose and a pressure sensor for measuring pressure at the end of the catheter hose in connection with a cardiac support system. Specifically, such a pressure measuring catheter is equipped with an optical pressure sensor and a long tube made of metal or high-strength plastic, e.g., PEEK, through which a loosely laid optical fiber of the optical pressure sensor extends. At the tip (end) of the pressure measuring catheter, according to the Fabry-Perot principle A sensor head that operates accordingly is positioned. This sensor head has a cavity that is terminated by a thin pressure-sensing glass film on one side and through which the end of an optical fiber protrudes on the other. This pressure-sensing glass film deforms according to the magnitude of the pressure applied to the sensor head. Through reflection from the glass film, light emanating from the optical fiber is modulated and reflected back to the optical fiber. An evaluation device equipped with an integrated CCD camera is positioned at the proximal end of the optical fiber, which The light acquired in the form of an interference pattern is evaluated. Accordingly, In this regard, a pressure-dependent electrical signal is generated. Therefore, overall, this is a photoelectric pressure sensor. Pressure measuring catheters are employed in connection with intravascular cardiac support systems, such as intra-arterial balloon pumps (IABPs) or intravascular rotary blood pumps, to first deliver the associated cardiac support system to a desired location within the patient's vascular system, namely, the aorta or heart chamber, for example, via a catheter hose. A pressure measuring catheter, comprising a tube enclosing an optical fiber, is movable along its length relative to the catheter hose, then guided into the lumen of the catheter hose, proceeds through the catheter hose, and exits from its end. Once the sensor head reaches the intended measurement position, the tube of the pressure measuring catheter can be withdrawn, but it may also remain permanently in place on the pressure measuring catheter. In relation to a rotary blood pump, it has been proposed to push the pressure measuring catheter past the pump mechanism of the rotary blood pump far beyond the end of the catheter hose, pass through the aortic valve, and protrude its sensor head into the left ventricle to measure ventricular pressure. Within the vascular system by a catheter The problem during navigation is the intersection of curvatures, vessel branchings, or obstacles, such as cardiac valves, for example. In such places, the catheter advances forward Instead, blocked by his musicality and on its own It can bend. This is known as "kinking." The doctor performing the procedure is not always aware of such kinking. Because the physiological pressure signals transmitted by the pressure sensor are often unclear, the doctor may not recognize a catheter misplacement but mistakenly believe that the catheter has reached the desired position. It can be estimated. Hereinafter, the present invention will be described by example with reference to the attached drawings. Figure 1 illustrates a blood pump installed through the aorta, which extends to the left ventricle through the aortic valve and has an integrated pressure and kink sensor. Figure 2 illustrates an optical pressure sensor having an optical fiber. FIG. 1 shows a catheter (10) inversely connected to the descending aorta (11). An intravascular blood pump is introduced. The descending aorta is a part of the aorta (12) that first ascends from the heart and then descends, and has an aortic arch (14). An aortic valve (15) is positioned at the beginning of the aorta (12), which connects the left ventricle (16) to the aorta (12), through which the intravascular blood pump extends. The intravascular blood pump includes, in addition to the catheter (10), a flow cannula (53) having a suction port (54) positioned at its end and protruding from the inlet end of the pump section (52), as well as a rotary pumping device (50) having a motor section (51) and a pump section (52) fixed to the end of the catheter hose (20) and positioned at a certain distance axially from it. At the end of the suction port (54), a soft flexible tip (55) is provided, and this The tip may be configured, for example, as a "pigtail" or in a J shape. Different lines and devices extend through the catheter hose (20), which are important for operating the pumping device (50). Of course, FIG. 1 only shows two optical fibers (28A, 28B) attached to the evaluation device (100) at their ends. These optical fibers (28A, 28B) are each part of an o