TORSIONAL INSERTION DEVICES
This disclosure relates to a detachable insertion mechanism that includes a torsion spring configured to impart rotational motion to a rotatable assembly and rotate the rotatable assembly between a first position and a second position in response to the rotational motion and a piston mechanism connected to a distal portion of the torsion spring and configured to move from a first insertion position to a second insertion position in response to the motion of the rotatable assembly. The piston mechanism includes a captive introducer needle disposed thereon. The captive introducer needle is configured to pierce tissue.
1 .- 20 . (canceled)
21 . A method for operating an infusion pump system, the method comprising:
inserting a cannula carrier into a disposable patch pump assembly in response to rotational motion of a rotatable structure, wherein the rotatable structure rotates in response to motion of a torsional spring;
forming an environmental and a fluid path seal in response to the cannula carrier being inserted into the patch pump assembly;
inserting a cannula and an introducer needle into subcutaneous tissue in response to rotational motion of the rotatable structure between a first position and a second position; and
retracting the introducer needle in response to rotational motion of the rotatable structure between the second position and a third position.
22 . The method of claim 21 , wherein the cannular carrier, the cannula, and the introducer needle are arranged on a piston mechanism configured to move linearly in response to rotational motion of the rotatable structure.
23 . The method of claim 22 , wherein the piston mechanism comprises a slot configured to receive a boss of the rotatable structure.
24 . The method of claim 23 , wherein the rotatable structure comprises a recess configured to receive a stop member.
25 . The method of claim 24 , further comprising disengaging the stop member to allow rotational motion of the rotatable structure in response to motion of the torsional spring.
26 . The method of claim 21 , wherein the disposable patch pump assembly further comprises a medical reservoir configured for holding a medicament.
27 . The method of claim 26 , wherein the cannula is configured for fluid communication with the medical reservoir of the disposable patch pump assembly.
28 . The method of claim 27 , further comprising dispensing the medicament through the cannula.
29 . A method for operating an infusion pump system, the method comprising:
inserting a cannula carrier into a patch pump assembly in response to rotational motion of a rotatable structure, wherein the rotatable structure rotates in response to motion of a torsional spring;
forming a seal around the canula carrier in response to the cannula carrier being inserted into the patch pump assembly;
inserting a cannula and an introducer needle into subcutaneous tissue in response to rotational motion of the rotatable structure;
retracting the introducer needle in response to further rotational motion of the rotatable structure after insertion of the introducer needle; and
dispensing a medicament through the cannula.
30 . The method of claim 29 , wherein the cannula carrier, the cannula, and the introducer needle are arranged on a piston mechanism configured to move linearly in response to rotational motion of the rotatable structure.
31 . The method of claim 29 , wherein inserting the cannula and the introducer needle into subcutaneous tissue comprises moving the cannula between a first cannula position and a second cannula position in response to rotational motion of the rotatable structure.
32 . The method of claim 29 , further comprising disengaging a stop to allow rotational motion of the rotatable structure in response to motion of the torsional spring.
33 . The method of claim 32 , wherein the rotatable structure comprises a recess configured to selectively receive the stop.
34 . The method of claim 29 , wherein the patch pump assembly is a disposable patch pump assembly retained in the infusion pump system by a latch assembly.
35 . The method of claim 34 , further comprising releasing the patch pump assembly from infusion pump system by actuating the latch assembly.
36 . A method for operating an infusion pump system, the method comprising:
disengaging a stop member from a stop recess of a rotatable structure to enable rotation of the rotatable structure;
rotating the rotatable structure via a torsion spring;
actuating a cannula carrier in response to rotation of the rotatable structure, wherein the cannula carrier has a cannula and an introducer needle disposed thereon, wherein the introducer needle is configured to pierce tissue;
inserting the cannula and the introducer needle into subcutaneous tissue with actuation of the cannula carrier; and
retracting the introducer needle with further actuation of the cannula carrier.
37 . The method of claim 36 , wherein the cannula carrier, the cannula, and the introducer needle are configured to move linearly in response to rotational motion of the rotatable structure.
38 . The method of claim 36 , wherein inserting the cannula and the introducer needle into subcutaneous tissue occurs in response to rotational motion of the rotatable structure between a first position and a second position.
39 . The method of claim 36 , wherein retracting the introducer needle occurs in response to rotational motion of the rotatable structure between the second position and a third position.
40 . The method of claim 36 , further comprising dispensing a medicament through the cannula after retracting the introducer needle.