Methods, devices, and systems for hemodilution
AssigneeNxStage Medical, Inc.
InventorsJames M. BRUGGER, Jeffrey H. BURBANK, Martin STILLIG
Life of this patent
Estimating the term…
Abstract
Devices, methods, and system that prevent clotting of blood during blood-processing procedures such as hemofiltration, hemodialysis, and hemodiafiltration are described. A filter with a cap has a housing that is shaped to receive a blood filter. The housing has an inlet for blood and may have an outlet for waste and ultrafiltrate. The cap is attached to the housing. The cap has an outlet for blood and a port adjacent the outlet for receiving dilution fluid. Methods of use during blood-processing procedures to provide immediate hemodilution to blood exiting entering and/or exiting a filter are also described.
Claims44
An extracorporeal blood filter, comprising:
- a housing having an interior volume separated by filter media into a non-blood part and blood part;
- the housing including a cap that defines a headspace, between the filter media and the cap, in fluid communication with the blood part;
- the cap having a blood port and a dilution fluid port, through which dilution fluid flows, opening directly to the headspace such that these ports are connected only through the headspace;
- at least one port connected to the non-blood part.
An extracorporeal blood filter, comprising:
- a housing having an interior volume separated by filter media into a non-blood part and blood part;
- the housing including a cap that defines a headspace, between the filter media and the cap, in fluid communication with the blood part;
- the cap having a blood port and dilution fluid port opening directly to the headspace such that blood flows through the blood port as dilution fluid enters the headspace and mixes with the blood;
- at least one port connected to the non-blood part.
A method for filtering blood, comprising:
- providing an extracorporeal blood filter, the filter comprising a housing having an interior volume separated by filter media into a non-blood part and blood part;
- the housing including a cap that defines a headspace, between the filter media and the cap, in fluid communication with the blood part;
- the cap having a blood port and a dilution fluid port, through which dilution fluid flows, opening directly to the headspace such that these ports are connected only through the headspace;
- and at least one port connected to the non-blood part;
- flowing blood through the blood part while simultaneously flowing blood in the headspace, flowing blood through the blood port, and flowing dilution fluid through the dilution fluid port into the headspace, such that dilution fluid is mixed with blood in the headspace.
A method for filtering blood, comprising:
- collecting blood flowing out of filter fiber membranes into a flow space;
- flowing a dilution fluid into the flow space such that the blood collected therein is swirled with the dilution fluid such that thrombus particles in the flow space are swept up by a swirling flow pattern.
Dependencies are inferred from the claim text.