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US 12,318,526 B2Granted
Syringe-based manual extracorporeal blood treatment systems and methods employing batch processing
AssigneeStavro Medical, Inc.
InventorLakhmir Singh Chawla
Life of this patent
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Abstract
The disclosure provides a manual blood or body fluid treatment system comprising first and second reservoirs for holding a batch of blood from a patient and a filter for performing an extracorporeal treatment on blood passing therethrough by removing waste molecules and/or fluid. The first reservoir is constructed to be displaced vertically relative to the second reservoir and vice versa, such that a height difference between the first and second reservoirs causes blood or body fluid to flow between the reservoirs due to gravity.
Claims12
A manual blood treatment system comprising:
- first and second reservoirs for holding a batch of blood from a patient;
- a first conduit for conveying blood from a vascular access of the patient during a first stage and for returning treated blood to the vascular access during a third stage, the first conduit having only a single lumen;
- a filter for performing, during a second stage, an extracorporeal treatment on blood passing therethrough by removing waste molecules and/or fluid;
- and
- a first syringe coupled to the first conduit via a first valve between the vascular access and the first reservoir,
- wherein fluid ports of the first and second reservoirs are connected to each other by a flow path through the filter such that the batch of blood can flow between the first and second reservoirs via the filter,
- the first reservoir is constructed to be displaced vertically relative to the second reservoir and vice versa, such that a height difference between the first and second reservoirs causes blood to flow between the reservoirs due to gravity;
- and
- a second syringe coupled to a drain line from the filter via a second valve,
- wherein the second syringe is configured to:
- apply a vacuum pressure to the filter when the second valve is in a first orientation, and
- apply a positive pressure to push effluent received from the filter along the drain line for disposal when the second valve is in a second orientation.
9 more elements
A manual blood treatment method comprising:
- (a) using a first syringe coupled to a first conduit by a first valve in a first orientation, applying a vacuum to a vascular access of a patient to withdraw a first volume of blood from a patient;
- (b) switching the first valve to a second orientation;
- (c) with the first valve in the second orientation, applying a positive pressure using the first syringe to convey the first volume of blood to a first reservoir;
- (d) changing respective heights of the first reservoir and a second reservoir, such that the first reservoir is higher than the second reservoir and such that blood in the first reservoir is conveyed to the second reservoir via a flowpath through a filter;
- (e) after (d), changing respective heights of the first and second reservoirs such that the second reservoir is higher than the first reservoir and such that blood in the second reservoir is returned to the first reservoir via the flowpath through the filter;
- (f) with the first valve in the second orientation, applying a vacuum using the first syringe to withdraw a second volume of blood from the first reservoir;
- (g) switching the first valve to the first orientation;
- (h) with the first valve in the first orientation, applying a positive pressure using the first syringe to convey the second volume of blood into the patient via the vascular access;
- and
- (i) during (d) and/or (e), using a second syringe coupled to a drain line of the filter by a second valve in a first orientation, applying a vacuum to the filter to withdraw effluent therefrom.
7 more elements
Dependencies are inferred from the claim text.