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Shape memory effect surgical needles

  • US 5,219,358 A
  • Filed: 08/29/1991
  • Issued: 06/15/1993
  • Est. Priority Date: 08/29/1991
  • Status: Expired due to Term
First Claim
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1. A method for introducing a curved needle to a surgical site in a patient, comprising the steps of(a) inserting a cannula into the patient to permit access from outside the patient to the surgical site,(b) providing a shape-metal-alloy needle that, having been formed into an arc shape and tempered at an elevated temperature, has been formed into an elongated shape while in a first, low-temperature state,(c) passing the elongated needle through the cannula, and(d) heating the needle to a temperature at which the alloy is converted to a second, high temperature state, thereby causing the needle to return to the arc shape.

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