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Method and system for inserting spinal catheters

  • US 5,160,323 A
  • Filed: 03/25/1991
  • Issued: 11/03/1992
  • Est. Priority Date: 05/26/1989
  • Status: Expired due to Fees
First Claim
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1. A catheter system for the insertion of a flexible catheter through the epidural space and dura-arachnoid membrane into the subarachnoid space of the spine of a patient comprising:

  • (a) a hollow needle having a sharpened tip, for insertion into the epidural space, and an exit end having a hub;

    (b) a cannula with a blunt distal end adapted for placement into and for coaxial movement within the hollow needle, whereby said cannula can be advanced forwardly within the hollow needle for abutment of the blunt distal end against the dura-arachnoid membrane to place the dura-arachnoid membrane in tension;

    (c) securing means for engaging and restraining the cannula within the hollow needle from coaxial rearward movement therein; and

    (d) a flexible catheter having a wire therein for insertion through the cannula and for penetrating the dura-arachnoid membrane, whereby the distal end of the catheter can be inserted a predetermined distance through the dura-arachnoid membrane into the subarachnoid space, the cannula and the hollow needle retracted along the catheter, and the wire withdrawn from the catheter.

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