Fluid conduit insertion devices
Disclosed herein are techniques related to insertion of a fluid conduit (e.g., tubing connected to a fluid reservoir or a cannula sharing a pre-assembled fluid pathway with such tubing). In some embodiments, an insertion mechanism may include one or more springs (e.g., a torsion spring or a compression spring). The one or more springs may cause a trocar or a trocar slider to pierce tissue and insert the fluid conduit. The one or more springs may further cause the trocar or the trocar slider to be removed from the tissue.
1. A torsional insertion mechanism, comprising:
a torsion spring configured to rotate a crank based on a difference between a first spring state and a second spring state; and
an insertion assembly including a conduit carrier and a trocar slider that is slidably disposed along the conduit carrier and configured to pierce tissue, wherein the conduit carrier comprises a first slot and the trocar slider comprises a second slot, wherein the crank is coupled to the conduit carrier and the trocar slider via the first and second slots such that the insertion assembly is configured to move from a first position to a second position in response to rotation of the crank,
wherein the crank is configured to decouple from the conduit carrier such that the trocar slider separates from the conduit carrier after piercing tissue.
2. The torsional insertion mechanism according to claim 1 , wherein the conduit carrier includes a flexible tube having a distal portion configured for insertion into tissue in response to rotational motion of the crank.
3. The torsional insertion mechanism according to claim 2 , wherein the insertion assembly further includes:
a fluid flow path that passes through the flexible tube in the conduit carrier, wherein the fluid flow path is configured for fluid communication between the distal portion of the flexible tube and a medicament reservoir.
4. The torsional insertion mechanism according to claim 1 , wherein the trocar slider is configured to pierce tissue in response to rotational motion of the crank.
5. The torsional insertion mechanism according to claim 1 , wherein the trocar slider includes a tab configured for moving the conduit carrier into the second position.
6. The torsional insertion mechanism according to claim 1 , further comprising a housing configured to retain a distal portion of the torsion spring, and wherein the torsion spring includes a proximal portion configured to engage with the crank and the second slot of the trocar slider.
7. The torsional insertion mechanism according to claim 1 , further comprising a trigger mechanism configured to selectively enable rotation of the crank.
8. The torsional insertion mechanism according to claim 1 , wherein the trocar slider and the conduit carrier are configured to move together from the first position to the second position.
9. The torsional insertion mechanism according to claim 1 , wherein the trocar slider is configured to return to the first position from the second position while the conduit carrier remains in the second position.
10. An infusion pump system, comprising:
a torsional insertion mechanism, including:
a torsion spring configured to rotate a crank based on a difference between a first spring state and a second spring state; and
an insertion assembly including a conduit carrier and a trocar slider that is slidably disposed along the conduit carrier and configured to pierce tissue, wherein the conduit carrier comprises a first slot and the trocar slider comprises a second slot, wherein the crank is coupled to the conduit carrier and the trocar slider via the first and second slots such that the insertion assembly is configured to move from a first position to a second position in response to rotation of the crank, wherein the crank is configured to decouple from the conduit carrier such that the trocar slider separates from the conduit carrier after piercing tissue.
11. The infusion pump system according to claim 10 , wherein the conduit carrier includes a flexible tube having a distal portion configured for insertion into tissue in response to rotational motion of the crank.
12. The infusion pump system according to claim 10 , wherein the trocar slider is configured to pierce tissue in response to rotational motion of the crank.
13. The infusion pump system according to claim 10 , wherein the trocar slider includes a tab configured for moving the conduit carrier into the second position.
14. The infusion pump system according to claim 10 , wherein the torsional insertion mechanism further includes a housing configured to retain a distal portion of the torsion spring, and wherein the torsion spring includes a proximal portion configured to engage with the crank and the second slot of the trocar slider.
15. The infusion pump system according to claim 10 , wherein the torsional insertion mechanism further includes a trigger mechanism configured to selectively enable rotation of the crank.
16. The infusion pump system according to claim 10 , wherein the trocar slider and the conduit carrier are configured to move together from the first position to the second position.
17. The infusion pump system according to claim 10 , wherein the trocar slider is configured to return to the first position from the second position while the conduit carrier remains in the second position.
18. A method for operating a torsional insertion mechanism of an insulin infusion system, the method comprising:
rotating a crank based on a difference between a first spring state and a second spring state of a torsion spring;
moving a trocar slider and a conduit carrier from a first position to a second position in response to rotation of the crank, wherein the conduit carrier comprises a first slot and the trocar slider comprises a second slot, and wherein the crank is coupled to the conduit carrier and the trocar slider via the first and second slots; and
returning the trocar slider to the first position while leaving the conduit carrier in the second position in response to continued rotation of the crank.
19. The method according to claim 18 , wherein moving the trocar slider and the conduit carrier from the first position to the second position comprises piercing tissue with at least the trocar slider.
20. The method according to claim 18 , wherein the first slot of the conduit carrier is open-ended, and wherein returning the trocar slider to the first position while leaving the conduit carrier in the second position comprises disengaging the crank from the conduit carrier via the first slot.