Sequence valve for piggyback IV administration
First Claim
1. A sequence valve having a first state in which a first flexible tube is occluded and a second flexible tube is not and a second state in which the second tube is occluded and the first tube is not, the sequence valve being manually settable to the first state and switching to the second state in response to a control signal, the sequence valve comprising:
- a base;
a crank pivotally connected to the base for movement between first and second crank positions, in which the sequence valve has the first state when the crank is in the first crank position and has the second state when the crank is in the second crank position;
bias means for providing a bias force to the crank which urges the crank toward the second crank position;
occluder means connected to a first end of the crank for occluding the first flexible tube when the crank is in the first crank position, and for occluding the second flexible tube when the crank is in the second crank position;
manually movable means connected to the crank for moving the crank to the first crank position;
a latch pivotally connected to the base, the latch having an arm and having a latch tooth for engaging a second end of the crank when the crank is moved to the first crank position by the manually movable means; and
a solenoid having a plunger which engages the arm of the latch to hold the latch tooth in engagement with the second end of the crank when the crank is in the first crank position, the solenoid being responsive to the control signal to move the plunger out of engagement with the arm to allow rotation of the latch and thereby allow the bias force to rotate the crank from the first crank position to the second crank position, wherein the solenoid is normally deenergized when the sequence valve is in the first state and when the sequence valve is in the second state, and is energized by the control signal to cause a transition from the first to the second state.
2 Assignments
0 Petitions
Accused Products
Abstract
A piggyback IV administration system uses a solenoid actuated sequence valve to control the flow of fluid from a pair of IV fluid sources to the inlet of an IV pump or controller. The sequence valve pinches off a first tube while allowing fluid to flow through the second tube and then, in response to a control signal, changes state so that the second tube is pinched off and fluid can flow through the first tube unimpeded.
83 Citations
29 Claims
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1. A sequence valve having a first state in which a first flexible tube is occluded and a second flexible tube is not and a second state in which the second tube is occluded and the first tube is not, the sequence valve being manually settable to the first state and switching to the second state in response to a control signal, the sequence valve comprising:
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a base; a crank pivotally connected to the base for movement between first and second crank positions, in which the sequence valve has the first state when the crank is in the first crank position and has the second state when the crank is in the second crank position; bias means for providing a bias force to the crank which urges the crank toward the second crank position; occluder means connected to a first end of the crank for occluding the first flexible tube when the crank is in the first crank position, and for occluding the second flexible tube when the crank is in the second crank position; manually movable means connected to the crank for moving the crank to the first crank position; a latch pivotally connected to the base, the latch having an arm and having a latch tooth for engaging a second end of the crank when the crank is moved to the first crank position by the manually movable means; and a solenoid having a plunger which engages the arm of the latch to hold the latch tooth in engagement with the second end of the crank when the crank is in the first crank position, the solenoid being responsive to the control signal to move the plunger out of engagement with the arm to allow rotation of the latch and thereby allow the bias force to rotate the crank from the first crank position to the second crank position, wherein the solenoid is normally deenergized when the sequence valve is in the first state and when the sequence valve is in the second state, and is energized by the control signal to cause a transition from the first to the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A sequence valve having a first state in which a first flexible tube is occluded and a second flexible tube is not and a second state in which the second tube is occluded and the first tube is not, the sequence valve being manually settable to the first state and switching to the second state in response to a control signal, the sequence valve comprising:
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a base; a pivotable tube pincher connected to the base, having means for pinching off the first tube when the valve is in the first state and the tube pincher is in a first position and then the second flexible tube when the valve is in the second state and the tube pincher is in a second position; bias means for applying a bias force to the tube pincher in a direction toward the second position; manually movable means connected to the tube pincher for moving the tube pincher against the bias force to the first position in which the first tube in pinched off; pivotable latch means for engaging and holding the tube pincher in the first position in which the first tube is pinched off, wherein the latch has a latch tooth and an arm, the latch having a first latch position in which the latch tooth holds the tube pincher and having a second latch position in which the latch tooth is out of engagement with the tube pincher; and solenoid means which releases the latch in response to the control signal to permit the latch to pivot out of engagement with the tube pincher and thereby allow the bias force to pivot the tube pincher to a position in which the second tube is pinched off, wherein the solenoid has a plunger for engaging the arm of the latch in the first latch position to hold the latch and for moving out of engagement with the arm in response to the control signal to release the latch, wherein the solenoid is normally deenergized when the sequence valve is in the first state and when the sequence valve is in the second state, and is energized by the control signal to cause a transition from the first to the second state. - View Dependent Claims (14, 15, 16, 17)
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18. An IV administraion system comprising:
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a first source of a first IV fluid; a second source of a second IV fluid; an IV control device having an inlet and an outlet for delivering IV fluids; a first flexible tube connected between the first source and the inlet; a second flexible tube connected between the second source and the inlet; a sequence valve having a first state in which a first flexible tube is occluded and a second flexible tube is not and a second state in which the second tube is occluded and the first tube is not, the sequence valve being manually settable to the first state and switching to the second state in response to a control signal, valve comprising; a base; a crank pivotally connected to the base for movement between first and second crank positions; bias means for providing a bias force to the crank which urges the crank toward the second crank position; occluder means connected to a first end of the crank for occluding the first flexible tube when the crank is in the first crank position, and for occluding the second flexible tube when the crank is in the second crank position; manually movable means connected to the crank for moving the crank to the first crank position; a latch pivotally connected to the base, the latch having an arm and having a latch tooth for engaging a second end of the crank when the crank is moved to the first crank position by the manually movable means; a solenoid having a plunger which engages the arm of the latch to hold the latch tooth in engagement with the second end of the crank when the crank is in the first crank position, the solenoid being responsive to the control signal to move the plunger out of engagement with the arm to allow rotation of the latch and thereby allow the bias force to rotate the crank from the first crank position to the second crank position, wherein the solenoid is normally deenergized when the sequence valve is in the first state and when the sequence valve is in the second state, and is energized by the control signal to cause a transition from the first to the second state; and means for providing the control signal to the sequence valve. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An IV administration system comprising:
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a first source of a first IV fluid; a second source of a second IV fluid; an IV control device having an inlet and an outlet for delivering IV fluids; a first flexible tube connected between the first source and the inlet; a second flexible tube connected between the second source and the inlet; a sequence valve having a first state in which a first flexible tube is occluded and a second flexible tube is not and a second state in which the second tube is occluded and the first tube is not, the sequence valve being manually settable to the first state and switching to the second state in response to a control signal, the sequence valve comprising; a base; a pivotable tube pincher connected to the base, having means for pinching off the first tube when the valve is in the first state and the tube pincher is in a first position and then the second tube when the valve is in the second state and the tube pincher is in a second position; bias means for applying a bias force to the tube pincher in a direction toward the second position; manually movable means connected to the tube pincher for moving the tube pincher against the bias force to the first position in which the first tube in pinched off; pivotable latch means for engaging and holding the tube pincher in the first position in which the first tube is pinched off, wherein the latch has a latch tooth and an arm, the latch having a first latch position in which the latch tooth holds the tube pincher and having a second latch position in which the latch tooth is out of engagement with the tube pincher; and solenoid means which releases the latch in response to the control signal to permit the latch to pivot out of engagement with the tube pincher and thereby allow the bias force to pivot the tube pincher to a position in which the second tube is pinched off, wherein the solenoid has a plunger for engaging the arm of the latch in the first latch position to hold the latch and for moving out of engagement with the arm in response to the control signal to release the latch; and means for providing the control signal to the sequence valve.
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Specification