SURGICAL ASPIRATING CANNULA

• US 3,810,471 A
• Filed: 03/22/1972
• Issued: 05/14/1974
• Est. Priority Date: 03/22/1972
• Status: Expired due to Term

• Current Assignee: Andrew Truhan
• Original Assignee: Andrew Truhan
• Inventors: Truhan, Andrew
• Primary Examiner(s): Rosenbaum, Charles F.
• Application Number:
  US05/236,947
• Time in Patent Office: 783 Days
• Field of Search: 128/276-278,240-241,350,184
• US Class Current: 604/45
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208
• CPC Class Codes: Y10S 604/902 Suction wands

Abstract

A surgical aspirating or draining device having means maintaining a zone of contamination free gas about the surgical site to reduce a minimum introduction of contaminated particulate and gaseous matter into the surgical site, cavity or wound.

Claims

1. A surgical aspirating or draining device comprising a first aspirating cannula, means connecting one end of said first cannula to a source of reduced pressure, the other end of said aspirating cannula being open to its environment at a surgical site, a second cannula fixed relative to the first cannula in substantially parallel relationship therewith, means connecting one end of the second cannula to a source of pressurized contamination-free gas at a pressure greater than the pressure of the environment of the open end of the first aspirating cannula, a plurality of outlets for the pressurized gas, at least one of the outlets being adjacent the zone of the surgical site of the open end of the first cannula whereby the zone of aspiration of said first aspirating cannula is bathed in gas issuing from said second cannula to thereby reduce introduction of contaminated particulate and gaseous matter into the surgical site.

2. A surgical aspirating or draining device comprising a first aspirating cannula, means connecting one end of said first cannula to a source of reduced pressure, the otheR end of said aspirating cannula being open to its environment at a surgical site, a second cannula maintained in proximity to the first cannula, means connecting one end of the second cannula to a source of pressurized contamination-free gas at a pressure greater than the pressure of the environment of the open end of the first aspirating cannula, a plurality of outlets for the pressurized gas, at least one of the outlets being adjacent the zone of the environment of the surgical site of the open end of the first cannula whereby the zone of aspiration of said first aspirating cannula is bathed in gas issuing from said second cannula to thereby reduce introduction of contaminated particulate and gaseous matter into the surgical site, the first and second cannulae having concentric bores.

3. A surgical aspirating or draining device as defined in claim 1 wherein the area of the outlets in the second cannula progressively decrease in size from adjacent the open end of the first cannula toward said one end thereof.