Delivering and/or receiving fluids
The present invention generally relates to receiving bodily fluid through a device opening. In one aspect, the device includes a flow activator arranged to cause fluid to be released from a subject. A deployment actuator may actuate the flow activator in a deployment direction, which may in turn cause fluid release from a subject. The flow activator may also be moved in a retraction direction by a retraction actuator. In one aspect, the device may include a vacuum source that may help facilitate fluid flow into the opening of the device and/or may help facilitate fluid flow from the opening to a storage chamber. In one aspect, a device actuator may enable fluid communication between the opening and the vacuum source and the flow activator may be actuated after the enablement of fluid communication.
1. A device for receiving fluid from a subject, comprising:
a device actuator;
a housing including an opening to receive fluid into the housing;
a vacuum source;
a flow path fluidly coupleable to the vacuum source to cause fluid to be drawn into the opening and along the flow path;
a membrane positioned along the flow path downstream of the opening that permits passage of air but prevents passage of liquids; and
one or more needles arranged to be inserted into a subject to cause fluid to be released from the subject.
2. The device of claim 1 , wherein actuating the device actuator enables fluid communication between the opening and the vacuum source.
3. The device of claim 2 , further comprising a flow control element that prevents fluid communication between the opening and the vacuum source, the flow control element being configured to enable fluid communication between the opening and the vacuum source after actuation of the device actuator.
4. The device of claim 1 , further comprising a deployment actuator configured to move the one or more needles in a deployment direction toward or through the opening, in response to actuation of the device actuator.
5. The device of claim 4 , wherein the deployment actuator includes a bistable element coupled to the one or more needles, the bistable element being arranged to move from a first stable state to a second stable state in response to actuation of the device actuator, wherein motion of the bistable element from the first stable state to the second stable state moves the one or more needles in a deployment direction toward or through the opening, and wherein the bistable element is incapable of moving from the second stable state to the first stable state in the absence of an external force on the bistable element.
6. The device of claim 4 , wherein the device actuator and the deployment actuator are arranged such that actuation of the device actuator causes the one or more needles to reach the subject after fluid communication between the opening and the vacuum source is enabled.
7. The device of claim 1 , further comprising a retraction actuator configured to move the one or more needles in a retraction direction away from the opening, in response to actuation of the device actuator.
8. The device of claim 7 , wherein the retraction actuator has stored potential energy prior to any deployment movement of the one or more needles.
9. The device of claim 7 , wherein the retraction actuator has a pre-deployment state prior to any deployment movement of the one or more needles and a post-retraction state after the retraction actuator has moved the one or more needles in the retraction direction away from the opening, and wherein stored potential energy of the retraction actuator is less in the post-retraction state than in the pre-deployment state.
10. The device of claim 9 , wherein a post-retraction distance of the one or more needles from the opening is greater than a post-deployment distance of the one or more needles from the opening.
11. The device of claim 9 , wherein the retraction actuator has decreased stored potential energy in the post-retraction state than in the pre-deployment state.
12. The device of claim 8 , wherein the stored potential energy increases as the one or more needles move toward a deployment direction toward or through the opening.
13. The device of claim 8 , wherein release of the stored potential energy causes movement of the one or more needles in the retraction direction.
14. The device of claim 7 , wherein the retraction actuator comprises a spring.
15. The device of claim 1 , wherein the flow path comprises a microfluidic channel.
16. The device of claim 1 , wherein the vacuum source comprises a vacuum chamber that is at a pressure less than ambient prior to actuation of the device actuator.
17. The device of claim 1 , wherein the membrane is positioned along the flow path upstream of the vacuum source.
18. The device of claim 16 , further comprising a storage chamber for receiving the fluid, wherein the membrane is positioned along the flow path downstream of the storage chamber and upstream of the vacuum chamber.
19. The device of claim 18 , wherein the vacuum chamber is spaced from the storage chamber.
20. The device of claim 16 , wherein the housing comprises a covering and base, and wherein the covering defines a portion of the vacuum chamber.
21. A device for receiving fluid from a subject, comprising:
a device actuator;
a housing including an opening to receive fluid into the housing;
a flow path fluidly coupleable to a vacuum source to cause fluid to be drawn into the opening and along the flow path;
a membrane positioned along the flow path downstream of the opening that permits passage of air but prevents passage of liquids; and
one or more needles that are configured to move relative to the housing to insert into a subject and cause fluid to be released from the subject.
22. The device of claim 21 , further comprising a deployment actuator configured to move the one or more needles in a deployment direction toward or through the opening in response to actuation of the device actuator.
23. The device of claim 22 , wherein the deployment actuator includes a bistable element coupled to the one or more needles, the bistable element being arranged to move from a first stable state to a second stable state in response to actuation of the device actuator, wherein motion of the bistable element from the first stable state to the second stable state moves the one or more needles in a deployment direction toward or through the opening, and wherein the bistable element is incapable of moving from the second stable state to the first stable state in the absence of an external force on the bistable element.
24. The device of claim 21 , further comprising a retraction actuator configured to move the one or more needles in a retraction direction away from the opening in response to actuation of the device actuator.
25. The device of claim 24 , wherein the retraction actuator has stored potential energy prior to any deployment movement of the one or more needles.
26. The device of claim 24 , wherein the retraction actuator has a pre-deployment state prior to any deployment movement of the one or more needles and a post-retraction state after the retraction actuator has moved the one or more needles in the retraction direction away from the opening, and wherein stored potential energy of the retraction actuator is less in the post-retraction state than in the pre-deployment state.
27. The device of claim 26 , wherein a post-retraction distance of the one or more needles from the opening is greater than a post-deployment distance of the one or more needles from the opening.
28. The device of claim 26 , wherein the retraction actuator has decreased stored potential energy in the post-retraction state than in the pre-deployment state.
29. The device of claim 25 , wherein the stored potential energy increases as the one or more needles move toward a deployment direction toward or through the opening.
30. The device of claim 25 , wherein release of the stored potential energy causes movement of the one or more needles in the retraction direction.
31. The device of claim 24 , wherein the retraction actuator comprises a spring.
32. The device of claim 21 , wherein the flow path comprises a microfluidic channel.