Intra-operative blood recovery system
Inventors
KRENSKY, Robert • Matsuura, David G. • Simpson, Philip J.
Assignees
Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-9199009-B2
Publication Date
2015-12-01
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 patent describes intra-operative autologous blood recovery from a blood-laden surgical sponge. Blood is recovered by compressing the sponge with a vacuum/negative-pressure system that drives the sponge against a perforated structure, so blood flows out of the sponge into a reservoir associated with the apparatus for collection.
The apparatus includes a vessel and a cylindrical strainer having a small diameter lower section joined to a large diameter upper section by a first flange. A piston is received within the strainer with an upper piston head for engaging the large diameter upper section and a lower piston head for engaging the small diameter lower section, and negative pressure is coupled to the vessel so that the piston travels within the strainer and acts on the sponge on the perforated base.
The patent further describes monitoring and integration aspects related to recovered blood. One embodiment includes a double-disc piston arrangement that intensifies force on the sponges to reduce hemolysis while lowering required negative pressure. The recovered blood can be drained to a cell saver/CPB and blood loss can be monitored by measuring reservoir volume or other reservoir indicia.
Claims Coverage
The document provides four independent claims covering a negative-pressure apparatus and method for recovering fluid with a cylindrical strainer and piston, an apparatus and method specifically for recovering blood from a sponge using a sponge retaining housing with a perforated base and pistons, and a method for monitoring blood loss by measuring blood in a reservoir after sponge extraction and pressure-driven blood egress. In total, these independent claims define inventive features centered on the strainer geometry, piston-driven sponge compression, pressure coupling, and reservoir collection and measurement.
Negative-pressure vessel and cylindrical strainer with piston-actuated egress via apertures
An apparatus for recovering fluid from a fluid retaining structure with a vessel including a port coupled to a source of negative pressure; a cylindrical strainer having a small diameter lower section with a base having a plurality of apertures joined to a large diameter upper section; and a piston with an upper piston head and a lower piston head that travels within the strainer under negative pressure to act on the fluid retaining structure so that fluid exits into a reservoir via the apertures.
Strainer-piston force application for egress into an associated reservoir
A method for recovering fluid from a fluid retaining structure and collecting the fluid in a vessel, including introducing a cylindrical strainer with a small diameter lower section having a base with a plurality of apertures and a large diameter upper section with a mouth defined by a first rim; introducing a piston with an upper piston head and a lower piston head; introducing the fluid retaining structure into the strainer; applying a force to cause the piston to travel within the strainer; and causing egress of the fluid from the fluid retaining structure into a reservoir associated with the vessel via the plurality of apertures.
Sponge retaining housing with perforated base and piston-forced blood flow for collection
An apparatus for recovering blood from a sponge containing the blood with a receptacle defining an internal chamber; a sponge retaining housing having a perforated base received by the receptacle; the sponge retaining housing including a body with a lower section having a small cross-sectional area joined to an upper section having a large cross-sectional area by a first flange, with the lower section base having a plurality of apertures; at least one piston received by the sponge retaining housing with a shaft separating an upper piston head for engaging the upper section and a lower piston head for engaging the lower section; the piston advancing and forcing the sponge against the perforated base so that blood is forced out of the sponge and flows through the perforated base for collection.
Monitoring blood loss by pressure-driven sponge-to-reservoir transfer and reservoir measurement
A method for monitoring blood loss including absorbing blood from a site with a surgical sponge; removing the surgical sponge from the site; introducing the sponge into a cylindrical strainer received by a vessel with a small diameter lower section having a base with a plurality of apertures and a large diameter upper section having a mouth defined by a first rim; introducing a piston into the strainer with an upper piston head and a lower piston head; coupling the vessel to a source of pressure and operating the pressure source to convey pressure to the vessel such that pressure causes piston travel and piston action on the sponge to cause egress of blood into a reservoir associated with the vessel via the plurality of apertures; and measuring the amount of blood in the reservoir.
Across the independent claims, the inventive coverage is defined by a geometric strainer arrangement with a small-diameter lower section and a perforated base, a piston whose travel is driven by pressure, and the resulting egress of blood or other fluid from a fluid retaining structure into a reservoir for collection. A further independent claim adds monitoring blood loss by measuring the amount of blood in the reservoir after the pressure-driven transfer.
Stated Advantages
Reduce hemolysis while lowering required negative pressure.
Documented Applications
Intra-operative autologous reinfusion/autotransfusion using recovered blood from a blood-laden surgical sponge.
Drainage of recovered blood to a cell saver/CPB machine.
Monitoring blood loss by measuring the amount of blood in a reservoir associated with the vessel after sponge-based blood egress.
Interested in licensing this patent?