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Intraoperative blood salvaging system and method
| Details |
Inventors: Shettigar, U. Ramakrishna;
Assignee:
Primary Examiner: Kim; John
Assistant Examiner:
Attorney, Agent or Firm: Trask, Britt & Rossa
An apparatus is disclosed for salvaging a patient's own blood during intraoperative surgical procedures and reinfusing the blood, washed and filtered, to the patient substantially continuously, on-line and in real-time. The apparatus comprises suction means, admixing means for admixing aspirated blood with a washing fluid, filtering means for filtering the admixture through an emboli filter, monitoring means for measuring the amount of cellular component volume in the aspirated, filtered blood, filtration means for removing excess fluid and impurities from the blood, and reinfusion means for introducing the washed and filtered blood to the patient free of emboli. The apparatus is structured to introduce washing fluid to the aspirated blood in proportion to the measured hematocrit level of the blood that is aspirated. Methods are disclosed for priming of the system, cleaning and flushing the apparatus of blood clots and debris by means of reverse filtration and filtration of blood for reinfusion. Methods for automated control of the blood salvaging system and operation are also disclosed. |
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DETAILED DESCRIPTION In accordance with the present invention, an intraoperative blood salvaging and purification system removes blood from a wound or surgical site, filters and purifies the blood by the addition thereto of washing fluid at a rate determined by a selected hematocrit level detected in the blood, and returns the blood to the patient on a substantially continuous basis.
The intraoperative blood salvaging and purification system is structured to process large amounts of blood and to return the salvaged blood to the patient free of impurities larger than a selected molecular size, and free of emboli.
The filtration system of the present invention maintains filtration integrity by providing reverse filtration to flush out clogging impurities from the filtration membrane.
The intraoperative blood salvaging system generally comprises a means for removing blood from a wound site or from an operative or post-operative site and means for mixing the blood with a washing fluid prior to delivering the blood to an emboli filter for initial washing of the blood.
The system also includes means for further filtering the salvaged blood to remove impurities larger than a selected molecular size through use of a membrane filter having a selected maximum pore size.
The blood salvaging system further includes structural means for delivering filtered and purified blood back to the patient on a substantially continuous basis, free of emboli.
In the present invention, a cardiotomy filter and reservoir are positioned to receive aspirated blood from the wound site and serve to (i) de-aerate the aspirated blood under vacuum; (ii) remove particle emboli, blood clots and other matter larger than a selected micron size; (iii) provide a reservoir large enough to accommodate large volumes of aspirated blood and washing fluid, and maintain a continuous source of liquid for the membrane filter and reinfusion line, thereby eliminating air from entering the membrane filter and reinfusion line; and (iv) monitor the extent of dilution of the aspirated blood (i
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Liquid Purification 
