Diaphragm-based reservoir for a closed blood sampling system
First Claim
1. A reservoir for use in a closed blood sampling system, the reservoir comprising:
- a rigid wall;
a flexible membrane overlying at least part of the rigid wall and sealingly secured thereto to define a variable volume chamber therebetween;
an inlet port and an exit port in fluid communication with the chamber;
the flexible membrane having a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position.
2 Assignments
0 Petitions
Accused Products
Abstract
A reservoir (10, 26, 80, 126, 226, 380) includes a rigid wall (12, 28, 82, 128, 228, 382), a flexible membrane (14, 34, 134, 234, 334) sealingly secured to the rigid wall (12, 28, 82, 128, 228, 382) to define a variable volume chamber (18, 38, 138, 238, 338), and inlet (40, 140, 240, 340) and exit (42, 142, 242, 342) ports in fluid communication with the chamber (18, 38, 138, 238, 338). A drive surface (24, 50, 150, 250, 350) engages the membrane (14, 34, 134, 234, 334) to position it adjacent the rigid wall (12, 28, 82, 128, 228, 382) to define a minimum volume position. The drive surface (24, 50, 150, 250, 350) may be moved so that the membrane (14, 34, 134, 234, 334) flexes out of the minimum volume position to an expanded volume position. The membrane (14, 34, 134, 234, 334) may be coupled to the drive surface (24, 50, 150, 250, 350) or be uncoupled from the drive surface (24, 50, 150, 250, 350). The reservoir (10, 26, 80, 126, 226, 326) may be included in a closed blood sampling system (88) for drawing a sample of whole blood.
140 Citations
114 Claims
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1. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a rigid wall;
a flexible membrane overlying at least part of the rigid wall and sealingly secured thereto to define a variable volume chamber therebetween;
an inlet port and an exit port in fluid communication with the chamber;
the flexible membrane having a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A closed blood sampling system comprising:
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tubing adapted to be coupled between a fluid supply and a circulatory system of a patient;
a reservoir disposed in the tubing comprising;
a rigid wall;
a flexible membrane overlying at least part of the rigid wall and sealingly secured thereto to define a variable volume chamber therebetween;
an inlet port and an exit port in fluid communication with the chamber, the flexible membrane having a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position; and
a sampling site disposed in the tubing intermediate the patient and the reservoir adapted to draw blood from the tubing. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. A method of sampling blood in a closed blood sampling system wherein the sampling system has tubing intermediate a fluid supply and the circulatory system of a patient, a reservoir disposed in the tubing having a rigid wall, a flexible membrane overlying at least part of the rigid wall and sealingly secured thereto to define a variable volume chamber therebetween, an inlet port and an exit port in fluid communication with the chamber, the flexible membrane with a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position, a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position, and a sampling site disposed in the tubing intermediate the patient and the reservoir adapted to draw blood from the tubing, the method comprising:
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flexing the membrane away from the minimum volume position to an expanded volume position so as to provide whole blood at the sampling site;
drawing whole blood from the sampling site; and
,flexing the membrane toward the minimum volume position so as to discharge fluid from the reservoir toward the patient. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66)
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67. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a lower housing having a rigid wall with an opening;
a flexible membrane sealingly secured to the lower housing and closing off the opening to define a variable volume chamber therebetween;
an inlet port and an exit port in fluid communication with the chamber;
an upper housing coupled to the lower housing;
the flexible membrane having a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port though the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
,a moveable plunger having a first portion received through the upper housing and having a drive surface fluidly isolated from the chamber, the drive surface being coupled to the flexible membrane, and a second portion for manipulation by a user, such that movement of the plunger in a first direction forcibly flexes the membrane toward the expanded volume position to draw fluid from a patient toward the reservoir so as to provide whole blood at a sampling site intermediate the patient and reservoir, and movement of the plunger in a second direction flexes the membrane toward the minimum volume position to discharge fluid from the reservoir toward the patient. - View Dependent Claims (68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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82. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a lower housing having a rigid wall with an opening;
a flexible membrane sealingly secured to the lower housing and closing off the opening to define a variable volume chamber therebetween;
an inlet port and an exit port in fluid communication with the chamber;
an upper housing coupled to the lower housing;
the flexible membrane having a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a moveable plunger having a first portion received through the upper housing and having a drive surface fluidly isolated from the chamber, and a second portion for manipulation by a user, such that movement of the plunger in a first direction flexes the membrane toward the expanded volume position under fluid pressure of a patient'"'"'s circulatory system so as to provide whole blood at a sampling site intermediate the patient and reservoir, and movement of the plunger in a second direction flexes the membrane toward the minimum volume position to discharge fluid from the reservoir toward the patient. - View Dependent Claims (83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94)
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95. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a lower housing having a rigid wall with an opening;
a flexible membrane sealingly secured to the lower housing and closing off the opening to define a variable volume chamber therebetween;
a channel formed in the rigid wall having an inlet port and an exit port, the channel in fluid communication with the chamber along at least a portion of the channel;
the flexible membrane having a minimum volume position with at least a portion of a lower surface of the membrane engaging the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position. - View Dependent Claims (96, 97, 98, 99, 100, 101, 102)
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103. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a lower housing having a rigid wall with an opening;
a flexible membrane sealingly secured to the lower housing and closing off the opening to define a variable volume chamber therebetween;
an inlet port and an exit port;
a channel in a surface of the rigid wall and extending between the inlet port and exit port, the channel being exposed to the chamber through an open top of the channel;
the flexible membrane having a minimum volume position closing off the open top of the channel without interfering flow between the inlet port and exit port through the channel, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position. - View Dependent Claims (104, 105, 106, 107)
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108. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a lower housing having a rigid wall with an opening;
a flexible membrane sealingly secured to the lower housing and closing off the opening to define a variable volume chamber therebetween;
an inlet port and an exit port;
a channel extending through the lower housing between the inlet port and exit port in fluid isolation from the chamber;
an access aperture in the rigid wall fluidly communicating between the channel and the chamber;
the flexible membrane having a minimum volume position sealing off the access aperture, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position thereby unsealing the access aperture; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position. - View Dependent Claims (109, 110, 111, 112)
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113. A reservoir for use in a closed blood sampling system, the reservoir comprising:
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a rigid wall;
a flexible membrane overlying at least part of the rigid wall and sealingly secured relative thereto to define a variable volume chamber therebetween;
an inlet port and an exit port in fluid communication with the chamber;
the flexible membrane having a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position; and
a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position.
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114. A method of sampling blood in a closed blood sampling system wherein the sampling system has tubing intermediate a fluid supply and the circulatory system of a patient, a reservoir disposed in the tubing having a rigid wall, a flexible membrane overlying at least part of the rigid wall and sealingly secured relative thereto to define a variable volume chamber therebetween, an inlet port and an exit port in fluid communication with the chamber, the flexible membrane with a minimum volume position spaced closely adjacent the rigid wall to define a minimum volume at which fluid still flows between the inlet port and exit port through the chamber, the flexible membrane being able to flex out of the minimum volume position to an expanded volume position, a drive surface adapted to engage against the flexible membrane to hold the membrane in the minimum volume position, and a sampling site disposed in the tubing intermediate the patient and the reservoir adapted to draw blood from the tubing, the method comprising:
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flexing the membrane away from the minimum volume position to an expanded volume position so as to provide whole blood at the sampling site;
drawing whole blood from the sampling site; and
,flexing the membrane toward the minimum volume position so as to discharge fluid from the reservoir toward the patient.
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Specification