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Catheter tube coupling assembly and methods

  • US 4,772,276 A
  • Filed: 07/27/1987
  • Issued: 09/20/1988
  • Est. Priority Date: 06/18/1987
  • Status: Expired due to Term
First Claim
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1. A barbless catheter tube coupling assembly comprising:

  • a first hollow fluid flow-accommodating rigid tubular member comprising an exposed synthetic resinous material comprising an elongated gripping exterior surface highly resistant to frictional displacement of other synthetic materials along said surface and having a predetermined outside maximum transverse dimension;

    a catheter tube of synthetic resinous material comprising opposed ends, one end telescopically and compressively contiguously superimposed upon substantially the entirety of the gripping surface and comprising outside and inside stressed transverse dimensions, the inside stressed transverse dimension of the one end of the catheter tube along substantially the entirety of the gripping surface of the tubular member being materially greater than the unstressed inside and outside transverse dimensions of said one end with the stressed inside transverse dimension of the assembled one end of the catheter tube being substantially the same as the outside transverse dimension of the first tubular member;

    a relative short flexible sleeve of synthetic resinous material telescopically and compressively contiguously superimposed upon the one end of the catheter tube, the flexible sleeve comprising outside and inside stressed transverse dimensions, the inside and outside flexible sleeve transverse dimensions in the stressed state being materially greater than the unstressed inside and outside transverse dimensions of the sleeve, with the stressed inside transverse dimension of the assembled sleeve being substantially the same as the one end of the catheter tube;

    the first tubular member, the enlarged one end of the catheter tube and the enlarged sleeve, when assembled, forming a secure ultra strong coupling, stable against inadvertent separation under normal stress conditions, the one end of the catheter tube imposing a substantial compressive memory stress upon the first tubular member, the sleeve imposing a substantial compressive memory stress upon the one end of the catheter tube and through the enlarged proximal end of the catheter tube upon substantially the entirety of the gripping surface of the stem and the gripping surface substantially restraining the one end of the catheter tube against axial displacement relative to the tubular member;

    whereby the one end of the catheter tube is reliably secured to the first tubular member against both axial and blow off separation.

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