Methods and Apparatus For Leak Detection in Blood Processing Systems
First Claim
Patent Images
1. A flow control valve, comprising:
- a flexible ring-shaped structure defining a central opening surrounded by non non-wetted surface thereof;
said ring-shaped structure having a wetted surface therewithin in fluid communication with multiple flow ports;
an actuator having a pivoting element with two ends, that fits within said ring-shaped structure;
said actuator having fixed elements that with edges that oppose said two ends on respective sides such that when said pivoting element is pivoted in a first direction, it pinches a first two portions of said ring-shaped structure against a first two of said edges, said first two portions corresponding to a first two flow passages of said ring-shaped structure and such that when said pivoting element is pivoted a second direction, it pinches a second two portions of said ring-shaped structure against a second two of said edges, said second two portions corresponding to a second two flow passages of said ring-shaped structure, a configuration of said ports being such that communication between a first two of said flow ports is blocked while fluid communication between a second two of said flow ports is permitted when said pivoting element is pivoted in said first direction while communication between a second two of said flow ports is blocked while fluid communication between a first two of said flow ports is permitted when said pivoting element is pivoted in said second direction.
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Abstract
A blood processing system includes a flow reversing device with at least an air sensor in the venous line located near the patient. During treatment, blood flow is reversed to cause air to infiltrate the blood lines if any disconnections or breaks in the blood line are present. One means for placing the sensor close to the patient is to provide the flow switching device aid sensors in a small lightweight module that can be located close the treatment machine. Another is to provide a module with just the sensors near the access.
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Citations
15 Claims
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1. A flow control valve, comprising:
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a flexible ring-shaped structure defining a central opening surrounded by non non-wetted surface thereof; said ring-shaped structure having a wetted surface therewithin in fluid communication with multiple flow ports; an actuator having a pivoting element with two ends, that fits within said ring-shaped structure; said actuator having fixed elements that with edges that oppose said two ends on respective sides such that when said pivoting element is pivoted in a first direction, it pinches a first two portions of said ring-shaped structure against a first two of said edges, said first two portions corresponding to a first two flow passages of said ring-shaped structure and such that when said pivoting element is pivoted a second direction, it pinches a second two portions of said ring-shaped structure against a second two of said edges, said second two portions corresponding to a second two flow passages of said ring-shaped structure, a configuration of said ports being such that communication between a first two of said flow ports is blocked while fluid communication between a second two of said flow ports is permitted when said pivoting element is pivoted in said first direction while communication between a second two of said flow ports is blocked while fluid communication between a first two of said flow ports is permitted when said pivoting element is pivoted in said second direction. - View Dependent Claims (2)
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3. A flow control valve, comprising:
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a flexible valve body linking together, for fluid communication, fluid ports fluidly connected by said valve body; said valve body forming a structure that surrounds a first portion of an actuator with at least one first pinching element; a second portion of said actuator that slides relative to said first portion; said valve body being at least partly confined within; second portion having at least one second pinching element opposing said at least one first pinching element; in a first configuration, said actuator pinching said valve body such that a first pair of said fluid ports are linked for fluid communication while a second pair is blocked; in a second configuration, said actuator pinching said valve body such that a second pair of said fluid ports are linked for fluid communication while said first pair is blocked. - View Dependent Claims (4)
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5. A blood flow reversing device for blood processing, comprising:
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a pair of patient-side ports for connection to a patient access; a pair of treatment-side ports for connection a blood processing machine; a reversing valve configured to allow blood to flow between said patient-side and said treatment-side ports in two selected directions of flow in said patient-side ports, such that blood flow from said patient-side ports and said patient access is selectively reversible; a controller configured to control said reversing valve and to reverse said blood flow for a first interval at a first frequency and for second interval on at a second frequency, said first frequency being greater than said second frequency. - View Dependent Claims (6, 7, 8, 9)
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10. A blood flow reversing device for blood processing, comprising:
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a reversing valve configured to reverse blood flow between a treatment apparatus and a patient access; a controller configured to control said reversing valve and to reverse said blood flow for a first interval at a first frequency and for second interval on at a second frequency, said first frequency being greater than said second frequency. - View Dependent Claims (11)
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12. A flow control valve, comprising:
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a flexible valve body linking together, for fluid communication, fluid ports fluidly connected by said valve body; an actuator having first and second clamp elements that are mutually selectively movable in first and second directions; said actuator pinching said valve body such that a first pair of said fluid ports are linked for fluid communication while a second pair is blocked when said first and second clamp element are mutually moved in said first direction; said actuator pinching said valve body such that a second pair of said fluid ports are linked for fluid communication while said first pair is blocked when said first and second clamp element are mutually moved in said second direction. - View Dependent Claims (13, 14, 15)
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Specification