Intra-operative blood recovery system
Inventors
KRENSKY, Robert • Matsuura, David G. • Simpson, Philip J.
Assignees
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Publication Number
US-10039867-B2
Publication Date
2018-08-07
Expiration Date
Abstract
A method for recovering blood from a blood-laden surgical sponge for autologous reinfusion, the method comprising the steps of: conveying negative pressure to a housing with the blood-laden surgical sponge; applying a predetermined force to draw the blood from the surgical sponge; and collecting the recovered blood.
Core Innovation
The invention describes an intra-operative autologous blood recovery system for autologous reinfusion in which blood from a surgical site is absorbed by a blood-laden surgical sponge and recovered using a sealed housing. The housing includes a strainer or perforated base that receives the blood-laden sponge, and the system uses a source of negative pressure to create a partial vacuum within the housing.
A diaphragm, flexible membrane, or piston mechanism is moved by the negative pressure, and in some embodiments both negative pressure and positive pressure, to collapse a flexible component and apply a predetermined force to compress the blood-laden sponge. Blood is forced to egress from the sponge and flow through apertures in the strainer for collection in a reservoir associated with the vessel.
Multiple embodiments are described, including arrangements where piston heads with a large diameter section and a small diameter lower section interact to provide mechanical pressure intensification, including a double high-pressure phenomenon and a pressure multiplication factor of at least two. The system can use filtration and anti-clotting, and can include measures to suppress hemolysis by selecting or configuring a pressure level in a predetermined pressure range and by monitoring blood loss via indicia or volume for transfer to downstream processing devices.
Claims Coverage
The partial content includes three independent claims. Across these claims, the coverage centers on absorbing blood with a blood absorbent structure or surgical sponge, placing the structure in a perforated strainer with a small diameter lower section joined to a large diameter upper section, and conveying pressure to a piston to force blood egress through perforations to a reservoir, with dependent refinements tying pressure selection to minimizing hemolytic effects.
Recovering autologous blood using a piston-driven perforated strainer geometry
Absorbing blood from a surgical site associated with the patient with a blood absorbent structure; introducing the blood absorbent structure into a perforated strainer received by a vessel; conveying pressure to the vessel to apply a force on a member movable within the perforated strainer to contact the blood absorbent structure and cause egress of the blood from the blood absorbent structure to flow through the perforated strainer for collection; wherein the strainer comprises a small diameter lower section joined to a large diameter upper section, the small diameter lower section having a base with a plurality of apertures, and the blood absorbent structure rests on said base; and wherein the member is a piston comprising an upper piston head for engaging the large diameter upper section and a lower piston head for engaging the small diameter lower section.
Recovering autologous blood using a surgical sponge and piston force into a reservoir
Absorbing blood from a surgical site associated with the patient with a surgical sponge; introducing the surgical sponge into a perforated strainer received by a vessel; conveying pressure to the vessel to apply a force on a piston to act on the surgical sponge and cause egress of the blood from the surgical sponge to flow through the perforated strainer into a reservoir; wherein the perforated strainer comprises a small diameter lower section joined to a large diameter upper section, the small diameter lower section having a base with a plurality of apertures; and wherein the piston comprises an upper piston head for engaging the large diameter upper section and a lower piston head for engaging the small diameter lower section.
Device using negative-pressure-driven piston action to expel sponge blood through a perforated strainer
A vessel for receiving a surgical sponge for absorbing blood from a surgical site associated with said patient; a perforated strainer received by said vessel; a piston; a source of pressure coupled to said vessel; whereby said piston is caused to travel within said strainer by a force provided by negative pressure; whereby said piston acts on said surgical sponge to cause egress of said blood from said surgical sponge to flow through said perforated strainer into a reservoir associated with said vessel; wherein said strainer comprises a body having a small diameter lower section joined to a large diameter upper section, said small diameter lower section having a base with a plurality of apertures, wherein said surgical sponge rests on said base; and wherein said piston comprises an upper piston head for engaging said large diameter upper section and a lower piston head for engaging said small diameter lower section.
Across the independent claims, the common inventive structure is the combination of a perforated strainer having a small diameter lower section joined to a large diameter upper section and a piston with an upper piston head and a lower piston head that engages the respective sections. Pressure is conveyed to cause blood egress from the absorbent structure through the perforated strainer into a reservoir, with dependent refinements further specifying pressure sources, mechanical advantage and pressure multiplication, sealing, and pressure level selection to minimize hemolytic effects.
Stated Advantages
Minimize hemolytic effects on blood components of the absorbed blood by selecting a pressure parameter.
Documented Applications
Intra-operative autologous blood recovery for autologous reinfusion into a patient.
Transfer of recovered blood to downstream processing devices including a cell saver machine and a cardiopulmonary bypass (CPB) machine.
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