Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1998-06-17
2000-06-06
Capossela, Ronald
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
2104161, 210436, 2105121, 422122, 604319, 604406, F04B 4308
Patent
active
060710950
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the art of articles for the collection and discharge of fluids. In particular, the invention relates to a disposable container for the collection of physiological fluids and transfer of the fluids to another container.
BACKGROUND
It is known to collect fluids, such as blood, from surgical sites with the use of vacuum pressures. The blood thus collected is often treated to remove air and particulate contaminates. Known filters for physiological fluids typically employ such features as a tubular inlet directed tangential to a cylindrical inlet chamber to generate centrifugal forces for separating the air from collected liquid and physical filters for further removal of particulate contaminates. These devices, however, do not lend themselves to easy discharge of the collected fluids and do not provide for effective treatment of the collected blood with anticoagulants, and the like.
SUMMARY OF THE INVENTION
In accordance with the invention, a blood collection chamber includes a vacuum chamber for accumulating a collected fluid, such as blood or other physiological fluids. An integral portion of the container forms at least a portion of a pump for discharging the collected fluid from the container. In the preferred embodiment, the chamber is used in a system for vacuum collection of blood and other physiological products from a surgical site.
The container is divided into upper and lower chambers. The upper chamber is cylindrical and receives the fluid from the surgical site and performs an initial separation of air and debris from the fluid. The initial separation is accomplished by directing the fluid into the chamber to form a vortex. The fluid is then passed through a filter between the upper and lower chambers for further cleaning. In the preferred embodiment, the vortex is created by introducing the fluids in a direction tangent to the upper chamber. A vacuum port communicates with the lower chamber to create a pressure differential that draws fluids from the surgical site into the upper chamber and then from the upper chamber into the lower chamber with the assistance of gravity.
The upper chamber is provided with a port for admitting a second fluid to be mixed with the collected fluids. In the preferred embodiment, the second fluid is an anticoagulant. The amount of anticoagulant drawn into the chamber is a function of the level of the vacuum pressure. Accordingly, more anticoagulant is drawn in as more fluid is drawn in, which tends to maintaining the proportion of the anticoagulant to that of the fluid collected in the container. This obviates the need for a separate pump or metering device for the anticoagulant.
An additional feature of the invention is the means by which the collected fluids are discharged from the container. Because the container is under negative pressure, the collected fluids must be pumped out of the container. A known type of pump is a roller pump, and the bottom of the lower chamber is formed into a platen for such a roller pump. The outlet tube is positioned adjacent the platen such that it will be pushed against the platen by the rollers when the chamber is placed onto the roller. Thus, the roller pump will be automatically loaded with the tubing and will be capable of operation immediately after the chamber is placed on the support containing the roller.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a chamber in accordance with the invention.
FIG. 2 is a transverse cross section of the chamber shown in FIG. 1 and installed on a roller pump base.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to FIG. 1, a chamber 400 in accordance with the invention comprises an upper element 402 that is attached to a lower element 404. The upper element includes an outer wall 406 and an inner wall 408, which form a generally cylindrical upper chamber, and a fluid inlet 410. The floor of the upper chamber includes a particulate filter 412 having openings in the range of 400.mu. to 600.mu.. A vacuum po
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patent: 5458567 (1995-10-01), Cathcart
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Capossela Ronald
Harvest Technologies Corporation
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