Coated bipolar electrocautery

• US 5,693,052 A
• Filed: 09/01/1995
• Issued: 12/02/1997
• Est. Priority Date: 09/01/1995
• Status: Expired due to Fees

• Current Assignee: Megadyne Medical Products Incorporated (Johnson & Johnson)
• Original Assignee: Megadyne Medical Products Incorporated (Johnson & Johnson)
• Inventors: Weaver, Drew D.
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US08/523,087
• Time in Patent Office: 823 Days
• Field of Search: 606/45, 606/48, 606/49, 606/50, 606/51, 606/52
• US Class Current: 606/51
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1442 Probes having pivoting end effectors, e.g. forceps
• CPC Class Codes: A61B 2018/00005 Cooling or heating of the probe or tissue immediately surrounding the probe
• CPC Class Codes: A61B 2018/00095 high, i.e. heat conducting
• CPC Class Codes: A61B 2018/00107 Coatings on the energy applicator

Abstract

As electrosurgical instrument that has characteristics especially attractive in performing bipolar electrosurgery. It is believed that the relatively high current densities typically employed in using bipolar instruments result in very high incidents of sticking and other undesired characteristics when such instruments are coated with conventional coatings. A nickel-free high chromium content composite coating that manifests undesired characteristics when employed with monopolar electrosurgical implements has unexpectedly been discovered to embody very desirable characteristics when employed with bipolar instruments and is therefore efficaciously employed as a coating on bipolar implements.

Claims

1. A bipolar electrocautery implement comprising:

(a) a surgical instrument having

(i) a first electrode with a first working surface, said first electrode being adapted for interconnection with a first of two electrical terminals from a radio frequency electrocautery voltage source; and

(ii) a second electrode with a second working surface, said second electrode being adapted for interconnection with a second of two electrical terminals from a radio frequency electrocautery voltage source; and

(b) coating means for transferring radio frequency energy therethrough to effect cautery, said coating means being disposed on at least portions of said first and said second working surfaces meant to contact tissue, and wherein said coating means consists of a nickel-free high chromium composite having a thermal conductivity at least about twice that of surgical stainless steel.

2. The bipolar electrocautery implement according to claim 1 wherein said coating means is effective to transfer said energy therethrough at current densities ranging from 0.0001 to 10.0 amperes per square centimeter.

3. A bipolar electrocautery implement according to claim 1 wherein said coating means essentially covers said first and said second working surfaces.

4. A bipolar electrocautery implement according to claim 1 wherein thickness of said coating means lies within a range of from about 0.0001 to about 0.0005 inch.