Medical catheter with coupling liquid compensation function

Abstract

The utility model belongs to the field of medical apparatus and instruments, disclose a kind of medical catheter with coupling liquid compensation function, comprising: catheter seat is equipped with containing cavity, and catheter seat is equipped with injection hole, air hole and first passage;One end of outer catheter is sealedly connected with catheter seat, other end is closed, and outer catheter is communicated with containing cavity and forms second passage;Retracement component is movably arranged in second passage;First sealing ring is arranged in containing cavity;Second sealing ring is arranged in containing cavity;Third sealing ring is fixedly arranged in the outside of retracement component, and first sealing ring and the closed end of outer catheter form first sealed cavity, and second sealed cavity is formed between first sealing ring and third sealing ring, and third sealed cavity is formed between second sealing ring and third sealing ring;Injection hole is communicated with first sealed cavity, and air hole is communicated with second sealed cavity and atmosphere;The both ends of first passage are communicated with first sealed cavity and third sealed cavity respectively.The utility model can avoid the air bubble or deflation in catheter when retracting.

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