Closed blood sampling system with isolated pressure monitoring

A medical system for fluid sampling of a fluid system of a patient, comprising:

• a conduit line with a proximal segment adapted to be supplied with a physiological fluid and a distal segment adapted to be in communication with a fluid system of a patient;
• a control valve connected between the proximal segment and the distal segment of the conduit line;
• a fluid sampling port having a flow path therethrough whose opposite ends open to internal channels in the control valve;
• a reservoir in fluid communication with a reservoir port of the control valve manifold;
• the control valve further including a valve member movable into at least three positions:
• a first position that provides open fluid communication from the proximal segment through the control valve to the distal segment,
• a second position that provides open fluid communication from the proximal segment to the distal segment while bypassing the reservoir and sampling port, and
• a third position that provides open fluid communication from the distal segment to the sampling port but prevents communication between the sampling port and both the reservoir and the proximal segment.

A method of taking samples and measuring the pressure of a fluid system of a patient, comprising:

• providing a fluid sampling system with a conduit line and a reservoir connected thereto between a proximal segment adapted to be supplied with a physiological fluid and a distal segment adapted to be in communication with a fluid system of a patient;
• interposing a control valve between the reservoir and the conduit line having a movable valve member with a control handle, the valve member movable into at least a first position and a second position;
• providing a pressure transducer connected to the conduit line for sensing the pressure of the fluid therein;
• providing a fluid sampling port in the sampling system;
• selecting the first position of the valve member to provide open fluid communication from the proximal segment to the distal segment via the control valve and the reservoir, and creating a reduced pressure within the reservoir such that fluid flows from the distal segment through the control valve into the reservoir sufficient to draw fluid from the fluid system of the patient past the sampling port;
• and
• selecting the second position of the valve member to provide open fluid communication from the proximal segment to the distal segment via the control valve while bypassing the reservoir, and monitoring the pressure sensed by the pressure transducer.

A medical system for fluid sampling of a fluid system of a patient, comprising:

• a conduit line with a proximal end adapted to be supplied with a physiological fluid and a distal end adapted to be in communication with a fluid system of a patient;
• a pressure transducer connected to the conduit line for sensing the pressure of the fluid therein;
• a fluid sampling port having a sampling cavity;
• a control valve interposed between the conduit line and the sampling port and having a manifold defining an interior chamber, the manifold having a proximal port fluidly connected to the conduit line, a distal port fluidly connected to the conduit line, an outlet port, and an inlet port, wherein each of the manifold ports opens to the interior chamber,
• the control valve further including a valve member movable within the interior chamber and having channels therein that selectively communicate with the manifold ports, the valve member being movable into at least three positions:
• a first position that provides open fluid communication from the conduit line to the proximal port and the outlet port of the control valve to the sampling cavity, and to the inlet port and the distal port of the control valve to the conduit line,
• a second position that provides open fluid communication from the conduit line to the proximal port and through at least one channel in the valve member and back to the conduit line while bypassing the sampling port, such that the pressure of fluid within the conduit line exclusive of the sampling port can be sensed by the pressure transducer, and
• a third position that provides open fluid communication from the distal end of the conduit line through the control valve to the sampling port but prevents communication between the sampling port and the proximal end of the conduit line.