Cryotherapy catheter and cryotherapy system

Abstract

The invention provides a cryotherapy catheter and a cryotherapy system. The cryotherapy catheter comprises a delivery pipe, wherein a blood leading-out channel, a blood leading-in channel and a balloon pressure control channel are formed in the delivery pipe; the delivery pipe is provided with a balloon for blocking blood circulation, the balloon is arranged close to the delivery tail end of the delivery pipe; the delivery pipe is provided with an autologous blood leading-out cavity opening, the autologous blood leading-out cavity opening is positioned at one side, far from the delivery tail end, of the balloon, and the autologous blood leading-out cavity opening communicates with the blood leading-out channel; the blood leading-in channel communicates with the delivery tail end of the delivery pipe from the delivery starting end of the delivery pipe; and the balloon pressure control channel communicates with a balloon inner cavity. The cryotherapy catheter is provided with the blood leading-out channel and the blood leading-in channel at the same time, so that the catheter can perform conveying and pump drainage synchronously, only an intervention wound needs to be opened on a human body, and the pain of a patient and the operation difficulty of medical staff are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of biomedical devices, in particular to a low temperature treatment catheter and a low temperature treatment system. Background technique [0002] Hypothermia as a method of neuroprotection has been used clinically since the 1960s, and a large number of basic and clinical studies at home and abroad have also confirmed that hypothermia has obvious neuroprotective effects. Studies have shown that mild hypothermia (33-35°C) can prevent high fever caused by brain damage, reduce the oxygen consumption of brain cells after cerebral hemorrhage or cerebral ischemia, improve the tolerance of brain cells to hypoxia, and It can reduce the basal metabolism of brain tissue, reduce the degree of acidosis of brain tissue after brain injury, protect the blood-brain barrier, reduce and prevent the occurrence and development of cerebral edema, reduce intracranial pressure, reduce the destruction of nerve cell structure, promo...

AI Technical Summary

Problems solved by technology

Compared with perfusing low-temperature autologous blood or low-temperature solution, cooling through heat exchange has slow cooling speed, low efficiency and poor temperature controllability. This is because the materials generally used to make interventional catheters are polymer materials, and their thermal conductivity is relatively low Low, and for the sake of sealing, pressure, and leakage prevention, the tube wall has a certain thickness, the heat exchange effect is poor, and the low temperature speed is slow, it is difficult to make the target area reach the required low temperature in a short time

At the same time, when the balloon is used for heat exchange, the diameter of the balloon is generally large and most of them are multi-balloon structures; due to the limitation of the structure, the area where the catheter can be used is limited, and the distance that the catheter can be inserted into the blood vessel is short, and it is difficult to reach the internal carotid branch arteries or even The intracranial artery area cannot effectively achieve more precise targeted cooling inside the brain tissue

In addition, the existing autologous blood cooling technology needs to open two interventional wounds in the human body to realize the functions of blood extraction and cooling blood introduction respectively, which increases the suffering of patients and the risk of infection, and also increases the difficulty of surgery for doctors.

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