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CN-122005989-A - ECMO arterial catheter for improving blood supply of distal limb

CN122005989ACN 122005989 ACN122005989 ACN 122005989ACN-122005989-A

Abstract

The invention discloses an ECMO arterial catheter for improving blood supply at a distal end of a limb, and relates to the technical field of medical appliances. The end opening of the circulation supporting cavity is used for supplying blood to the abdominal aorta, and the side wall of the distal perfusion cavity is provided with a side hole and supplies blood to the distal end of the limb. The outer wall of the catheter is provided with an annular blocking water bag which can be attached to the inner wall of a blood vessel after filling, and separates two blood flows to prevent backflow, so that the remote perfusion efficiency is improved. The external section is provided with a flow limiting device and a flow sensing device which are connected in series, so that the real-time monitoring and closed-loop regulation and control of the blood flow are realized. According to the invention, the circulatory support and the remote perfusion of the limb can be synchronously completed through single puncture, so that the puncture damage and operation risks are reduced, and the risk of lower limb ischemia caused by delayed indwelling of the remote perfusion tube due to untimely evaluation or incorrect evaluation is avoided. Effectively solves the problem of limb distal ischemia after ECMO tube placement.

Inventors

  • CHEN YI
  • XIE GUOJIN
  • Cen Xiangying

Assignees

  • 东莞市滨海湾中心医院

Dates

Publication Date
20260512
Application Date
20260320

Claims (10)

  1. 1. The ECMO arterial catheter for improving blood supply at the distal end of a limb is characterized by comprising a catheter main body (1), wherein the catheter main body (1) is of an integrated double-cavity separation design, a circulating supporting cavity (2) and a distal perfusion cavity (3) which are not communicated with each other are formed by axially and parallelly separating, an opening of the circulating supporting cavity (2) is arranged at the tail end of the catheter main body (1) and is used for reversely conveying blood flow towards the abdominal aorta direction, the opening of the distal perfusion cavity (3) is of a side hole structure and is formed in the side wall of the catheter main body (1), an annular blocking water bag (4) is fixedly assembled on the outer wall of the catheter main body (1) in the centripetal direction of the side hole, an independent water injection runner (5) is arranged in the blocking water bag (4), the water injection runner (5) extends to the outside of the body along a cavity wall interlayer of the catheter main body (1) and is connected with a special water injection interface, a flow limiting device and a flow sensing device which are connected with the distal perfusion cavity (3) in series are further arranged at the outer section of the catheter main body (1), and the flow sensing device establish signal linkage with the flow limiting device, and the distal perfusion cavity (3) form a three-way branch joint (2) through the branch joint.
  2. 2. The ECMO arterial catheter as claimed in claim 1, wherein the catheter body (1) is made of a material consistent with that of an original ECMO arterial end single-lumen catheter, and the separation wall of the circulation support cavity (2) and the distal perfusion cavity (3) is made of medical grade elastic materials.
  3. 3. The ECMO arterial catheter as claimed in claim 1, wherein the side holes of the distal perfusion lumen (3) are of a single-sided design, are arranged at a position 5cm away from the end of the catheter body (1), and the number of the side holes is adapted to clinical common blood flow requirements.
  4. 4. The ECMO arterial catheter as claimed in claim 1, wherein the annular water-blocking bag (4) is made of high-elasticity medical polyurethane material and is flatly attached to the outer wall of the catheter main body (1) in a non-water-injected state.
  5. 5. The ECMO arterial catheter as claimed in claim 1, wherein the annular water-blocking balloon (4) has a maximum radial expansion diameter of 8-12mm and an axial length of 1.5-2cm in the inflated state, and can completely fit the inner wall of the femoral vessel and separate the opening of the circulation supporting cavity (2) from the side hole of the distal perfusion cavity (3).
  6. 6. The ECMO arterial catheter as claimed in claim 1, characterized in that the water injection port is equipped with a sealing valve and is independent of the blood flow channel and is not in communication with the circulatory support chamber (2) or the distal perfusion chamber (3).
  7. 7. The ECMO arterial catheter as defined in claim 1, wherein the flow limiting device is an adjustable pressurizing valve structure, an elastic sealing valve core is arranged in the valve body, the pressurizing degree of the valve core to the pipeline can be changed by rotating an external adjusting knob, and the stepped adjustment of the pipe diameter of the distal perfusion cavity (3) is realized.
  8. 8. The ECMO arterial catheter of claim 1, wherein the flow sensor is a miniature ultrasonic flow sensor, and the sensor probe is attached to the inner wall of the distal perfusion lumen (3) and connected to the external display terminal through a wire.
  9. 9. The ECMO arterial catheter as defined in claim 1, wherein the circulation support chamber (2) is fixedly connected with the arterial output end of the ECMO host computer through a standard pipeline joint, the flow limiting device is fixedly connected with the flow sensing device through a medical grade pipeline joint, and each connecting part is reinforced by a medical grade sealing material.
  10. 10. ECMO arterial catheter as claimed in claim 1, characterized in that the outer wall of the catheter body (1) is provided with anti-slip markings for identifying the respective structural position.

Description

ECMO arterial catheter for improving blood supply of distal limb Technical Field The invention relates to the technical field of medical appliances, in particular to an ECMO arterial catheter for improving blood supply of a distal end of a limb. Background ECMO (extracorporeal membrane oxygenation) technology is a common and effective treatment modality for oxygenation cycle support currently performed for a variety of respiratory cycle failure patients. In order to perform blood flow perfusion of an arterial system on a patient, a puncture catheter placement operation is required to be performed on the femoral artery of the patient, and blood flow is provided in the retrograde direction of the abdominal aorta by placing an arterial perfusion catheter so as to achieve the purpose of improving the arterial perfusion of the patient body. However, since the internal diameter of femoral artery vessel on one side of the patient is occupied by arterial perfusion tube after the arterial is placed, a considerable proportion of patients will suffer from insufficient blood supply to the distal vessel of the limb at the end of the vessel, which causes ischemia, circulatory disturbance and even limb necrosis of the affected limb, which requires the undesirable consequences of post amputation. Aiming at the situation, the traditional solution is to dynamically monitor the blood circulation condition of the lower limb after the tube placement, once the obvious ischemia of the lower limb is judged, the blood vessel behind the arterial infusion tube is additionally punctured by a blood vessel, a distal infusion tube is reserved, and the blood flow of the distal infusion tube is supplied by the three-way tube of the ECMO arterial infusion end in a shunting way, so that the purpose of providing the blood flow to the limb at the tube placement end is achieved. The traditional scheme can partially solve the problem of blood supply at the distal end of the catheterized limb, but has more defects that 1, repeated puncture operation work is added, and because ischemic blood vessels tend to have narrow tube diameters, the puncture failure probability is high. 2. Increased vascular injury, and increased risk of adverse events that may result in bleeding and hematoma from multiple puncture procedures. The ECMO arterial perfusion tube occupies femoral vascular space, but a gap through which blood can pass is reserved, and under the condition of limb distal ischemia, the distal blood supply resistance is increased, so that the blood flow of the distal perfusion tube flows back to the abdominal aorta direction due to pressure difference, and the distal limb cannot be effectively perfused. 4. The distal end perfusion tube of traditional scheme is through the three-way pipe reposition of redundant personnel supply distal end perfusion tube blood flow of ECMO artery perfusion end, and the flow is uncontrollable, and distal end perfusion effect is difficult to regulate and control. 5. At present, no widely accepted judging standard is obtained to confirm whether the lower limb ischemia exists, the cognitive difference of different institutions and individuals on the time for intervening in the lower limb perfusion is large, so that intervention delay occurs in a considerable proportion of cases, the lower limb ischemia necrosis is caused, and even the adverse consequences of amputation are needed. Aiming at the defects of the traditional scheme, the ECMO arterial perfusion tube is structurally redesigned, circulation support and distal perfusion blood flow are separated in the physical perfusion tube, a water blocking bag and a distal perfusion side hole are added, the aim that the ECMO arterial perfusion tube can simultaneously provide blood flow for the body circulation and the distal limb of a puncture part by using an ECMO system in one puncture operation is achieved, meanwhile, the two ends of the blood vessel are blocked by using the water bag, a flow limiting device is additionally arranged at the outer section of the tube body to adjust the distal perfusion blood flow, the distal perfusion effect of the body is further ensured, and the blood supply of the limb of a patient is effectively ensured. Disclosure of Invention The invention aims to solve the problems, and provides an ECMO arterial catheter for improving blood supply at the distal end of a limb, so as to solve the original problem of insufficient blood supply at the distal end of the limb after ECMO catheter placement in the prior art, and avoid the defects of difficult evaluation, puncture risk, hidden danger of backflow, flow out of control and the like of the traditional extra puncture scheme. The ECMO arterial catheter for improving blood supply at the distal end of a limb comprises a catheter main body, wherein the catheter main body is of an integrated double-cavity separation design, a circulation supporting cavity and a distal perfusion cavity which are not communi