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Surgical aspirator and monitor
| Details |
Inventors: Lash, Robert; Hatfield, Gregory;
Assignee: MD Engineering (Hayward, CA)
Primary Examiner: Coven; Edward M.
Assistant Examiner: Citrin; Randy
Attorney, Agent or Firm: Zimmerman; Harris, Cohen; Howard
An apparatus for surgical aspiration and monitoring of the aspirated fluids includes a sealable aspiration bottle supported by an electronic weighing scale on a base stand. The bottle includes tubing connectors joined to a negative gauge pressure source and to an aspirating surgical instrument. A pair of electrodes extend into the bottle and are connected to an electronic circuit which measures the impedance of the fluid/tissue aspirate in the bottle. A microprocessor receives the impedance and net weight data of the aspirate, determines the relative amounts and net weights of fluid and tissue in the aspirate, and displays this information on a visual display. |
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DETAILED DESCRIPTION We claim: 1.
For use with an aspirating surgical instrument, apparatus including means for collecting aspirate from the surgical instrument, means for monitoring the weight of the aspirate as it is collected, means for determining the impedance characteristic of the aspirate as it is collected, means for calculating the relative amounts of tissue and physiological fluid in the aspirate based on the monitored weight and impedance characteristic, and means for displaying the weight and relative amounts of tissue and physiological fluid of the aspirate.
2.
The apparatus of claim 1, wherein said means for collecting the aspirate includes a collection bottle having means to connect to a vacuum source and to the aspirating surgical instrument.
3.
The apparatus of claim 2, wherein said collection bottle includes an opening, and further including a cap assembly for releasably sealing said opening.
4.
The apparatus of claim 3, wherein said cap assembly includes a pair of fluid flow channels extending therethrough, and further including a pair of electrodes extending downwardly from said cap assembly into said bottle and disposed to be immersed in the aspirate.
5.
The apparatus of claim 4, further including a pair of tubing nipples extending from said cap assembly and adapted to be connected to tubing members extending to said vacuum source and to said aspirating surgical instrument, said tubing nipples being formed of a conductive material, each of said pair of electrodes being electrically connected to one of said tubing nipples.
6.
The apparatus of claim 5, wherein said cap assembly includes a stopper portion received in said bottle opening, and a cap portion removably secured to said stopper portion, said cap portion including electrical contact means for engaging said tubing nipples exteriorly of said stopper portion in electrically conductive fashion.
7.
The apparatus of claim 6, further including an electrical cable extending from said electrical contact means to said means for calculating the relative amounts of tissue and physiologic fluid in the aspirate
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