Fluid control devices and methods of using the same
An apparatus includes an inlet configured to be placed in fluid communication with a bodily fluid source and an outlet configured to be placed in fluid communication with a fluid collection device. A sequestration portion can be configured to receive an initial volume of bodily fluid. A flow controller disposed in the sequestration portion can be configured to transition from a first state to a second state in response to contact with the initial volume of bodily fluid. As the flow controller transitions, a negative pressure differential can be defined that is operable to draw the initial volume of bodily fluid into the sequestration portion. When the flow controller is in the second state, the negative pressure differential can be substantially equalized such that (1) the sequestration portion sequesters the initial volume and (2) a subsequent volume of bodily fluid can be transferred from the inlet to the outlet.
1 . An apparatus, comprising:
an inlet configured to be placed in fluid communication with a bodily fluid source;
an outlet configured to be placed in fluid communication with a fluid collection device;
a sequestration portion configured to be in fluid communication with the inlet, the sequestration portion including a vent configured to allow a flow of a gas out of the sequestration portion and a flow of a bodily fluid from the bodily fluid source into the sequestration portion; and
a flow controller disposed in the sequestration portion, the flow controller including an expandable hydrophilic material, a seal, and an extension extending from the seal, the expandable hydrophilic material configured to expand in response to contact with a portion of the bodily fluid to move the seal within the sequestration portion relative to the outlet thereby transitioning the flow controller from a first state such that the extension obstructs the outlet to a second state such that the outlet is unobstructed by the extension,
the flow controller configured to allow a negative pressure differential between the sequestration portion and the inlet as the flow controller transitions from the first state to the second state such that the negative pressure differential draws the flow of the bodily fluid from the inlet into the sequestration portion,
the flow controller in the second state configured to (i) allow the negative pressure differential to equalize, (ii) sequester the bodily fluid in the sequestration portion, and (iii) place the extension in a position in which a fluid flow path from the inlet to the outlet is unobstructed such that a sample volume of the bodily fluid is transferred from the inlet to the outlet via the fluid flow path.
2 . The apparatus of claim 1 , wherein the flow controller is configured to transition from the first state to the second state automatically.
3 . The apparatus of claim 1 , wherein the vent includes a selectively permeable material.
4 . The apparatus of claim 3 , wherein the vent is configured to allow the flow of the gas through the flow controller and to prevent a flow of the bodily fluid through the vent when the flow controller is in the first state.
5 . The apparatus of claim 4 , wherein the vent is configured to prevent a flow of the gas and the bodily fluid through the vent when the flow controller is in the second state.
6 . The apparatus of claim 1 , wherein the flow controller is configured to be placed in the second state in response to the portion of the bodily fluid saturating the expandable hydrophilic material.
7 . The apparatus of claim 1 , wherein the negative pressure differential is a first negative pressure differential, the fluid collection device being placed in fluid communication with the outlet operable to produce a second pressure differential between the outlet and the inlet when the flow controller is in the second state.
8 . The apparatus of claim 7 , wherein the fluid collection device is at least one of a syringe and a sample reservoir.
9 . The apparatus of claim 1 , wherein the extension extends in a distal direction from the seal.
10 . The apparatus of claim 1 , wherein expansion of the expandable hydrophilic material moves the seal through the sequestration portion in a proximal direction.
11 . An apparatus, comprising:
an inlet configured to be placed in fluid communication with a bodily fluid source;
an outlet configured to be placed in fluid communication with a fluid collection device;
a sequestration portion configured to be in fluid communication with the inlet and configured to receive a first volume of a bodily fluid from the inlet, the sequestration portion including a selectively permeable vent configured to at least temporarily vent the sequestration portion as the first volume of the bodily fluid flows from the bodily fluid source, through the inlet, and into the sequestration portion; and
a flow controller disposed in the sequestration portion and including an expandable hydrophilic material, a seal, and an extension extending from the seal, the expandable hydrophilic material configured to expand in response to contact with a portion of the first volume of the bodily fluid to move the seal within the sequestration portion relative to the outlet thereby transitioning the flow controller from a first state, in which the extension obstructs the outlet, to a second state, in which the flow controller places the extension in a position in which a fluid flow path from the inlet to the outlet is unobstructed by the extension such that a second volume of the bodily fluid flows from the inlet to the outlet via the fluid flow path,
the flow controller configured to produce a negative pressure differential between the sequestration portion and the inlet such that the sequestration portion receives the first volume of the bodily fluid, the negative pressure differential being equalized when the flow controller is in the second state.
12 . The apparatus of claim 11 , wherein the selectively permeable vent is configured to transition from a first state in which the selectively permeable vent allows a flow of a gas through the selectively permeable vent and prevents a flow of the first volume of the bodily fluid through the selectively permeable vent, to a second state in which the selectively permeable vent is configured to prevent a flow of the gas and the first volume of the bodily fluid through the selectively permeable vent.
13 . The apparatus of claim 12 , wherein the selectively permeable vent is configured to be placed in the second state in response to the portion of the first volume of the bodily fluid saturating the selectively permeable vent.
14 . The apparatus of claim 11 , wherein the selectively permeable vent is configured to vent the sequestration portion such that a pressure within the sequestration portion is less than a pressure within the fluid flow path defined between the inlet and the outlet.
15 . The apparatus of claim 11 , wherein the flow controller is configured to automatically transition from the first state to the second state in response to the expandable hydrophilic material being placed in contact with the portion of the first volume of the bodily fluid.
16 . The apparatus of claim 11 , wherein the extension extends distal to the seal.
17 . The apparatus of claim 11 , wherein expansion of the expandable hydrophilic material moves the seal through the sequestration portion in a proximal direction.
18 . A method of using a flow control device to obtain a bodily fluid sample with reduced contamination, the method comprising:
establishing fluid communication between a bodily fluid source and an inlet of the flow control device;
venting a sequestration portion of the flow control device to produce a negative pressure differential between the sequestration portion and the inlet;
receiving a first volume of a bodily fluid from the inlet and into the sequestration portion in response to the negative pressure differential;
transitioning a flow controller disposed in the sequestration portion from a first state to a second state in response to the flow controller being placed in contact with a portion of the first volume of the bodily fluid, the flow controller including an expandable hydrophilic material, a seal, and an extension extending from the seal, the expandable hydrophilic material configured to expand in response to contact with the portion of the first volume of the bodily fluid to move the seal within the sequestration portion relative to an outlet of the flow control device thereby transitioning the flow controller from the first state such that the extension obstructs the outlet to the second state such that the extension is placed in a position in which a fluid flow path from the inlet to the outlet is unobstructed by the extension, the negative pressure differential being equalized when the flow controller is in the second state;
sequestering the first volume of the bodily fluid in the sequestration portion when the flow controller is in the second state; and
transferring, via the fluid flow path, a second volume of the bodily fluid from the inlet to a fluid collection device in fluid communication with the outlet when the flow controller is in the second state.
19 . The method of claim 18 , wherein the sequestration portion includes a selectively permeable vent.
20 . The method of claim 19 , wherein the selectively permeable vent is configured to vent the sequestration portion such that a pressure within the sequestration portion is less than a pressure within a fluid flow path defined between the inlet and the outlet.
21 . The method of claim 19 , wherein the selectively permeable vent is configured to transition from a first state in which the selectively permeable vent is configured to allow a flow of a gas through the selectively permeable vent and to prevent a flow of the first volume of the bodily fluid through the selectively permeable vent, to a second state in which the selectively permeable vent is configured to prevent a flow of the gas and the first volume of the bodily fluid through the selectively permeable vent.
22 . The method of claim 18 , wherein the flow controller is configured to automatically transition from the first state to the second state in response to the expandable hydrophilic material being placed in contact with the portion of the first volume of the bodily fluid.
23 . The method of claim 18 , wherein the sequestering includes sequestering the bodily fluid as a result of the expandable hydrophilic material absorbing the portion of the first volume of the bodily fluid.
24 . The method of claim 18 , wherein the expandable hydrophilic material is configured to absorb at least the portion of the first volume of the bodily fluid to transition the flow controller from the first state to the second state.
25 . The method of claim 18 , wherein the sequestration portion is filled when the first volume of the bodily fluid is in the sequestration portion.
26 . The method of claim 18 , wherein the sequestering of the first volume of the bodily fluid sequesters contaminants within the sequestration portion such that the second volume of the bodily fluid has reduced contamination.
27 . The method of claim 18 , further comprising:
establishing fluid communication between the outlet and the fluid collection device after the sequestering of the second volume of the bodily fluid.
28 . The method of claim 18 , wherein expansion of the expandable hydrophilic material moves the seal through the sequestration portion in a proximal direction.