Infusion medium delivery system, device and method with needle inserter and needle inserter device and method

• US 20080051718A1
• Filed: 12/26/2006
• Published: 02/28/2008
• Est. Priority Date: 08/23/2006
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Kavazov, Julian D., Hanson, Ian B., Mounce, R. Paul
• Granted Patent: US 7,736,338 B2
• Time in Patent Office: Days
• US Class Current: 604/164.01
• CPC Class Codes: A61M 2005/14252 with needle insertion means
• CPC Class Codes: A61M 2005/1426 with means for preventing access to the needle after use
• CPC Class Codes: A61M 2005/14268 with a reusable and a disposable component
• CPC Class Codes: A61M 2005/1581 Right-angle needle-type devices
• CPC Class Codes: A61M 2005/1583 Needle extractors
• CPC Class Codes: A61M 2005/1585 Needle inserters
• CPC Class Codes: A61M 2005/1587 suitable for being connected to an infusion line after insertion into a patient
• CPC Class Codes: A61M 2005/3289 with rotation of the needle, e.g. to ease penetration
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• CPC Class Codes: A61M 5/14248 of the skin patch type
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
• CPC Class Codes: A61M 5/3287 Accessories for bringing the needle into the body; Automatic needle insertion A61M5/20, A61M5/31525 take precedence
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

An infusion medium delivery system, device and method for delivering an infusion medium to a patient-user, includes a needle inserter device and method for inserting a needle and/or cannula into a patient-user to convey the infusion medium to the patient-user. The needle inserter device and method operate to insert a needle and cannula into a patient-user'"'"'s skin and automatically withdraw the needle from the patient-user, leaving the cannula in place and in fluid flow communication with a reservoir. The delivery device may include a base portion and a durable portion connectable to the base portion, and wherein the base portion can be separated from the durable portion and disposed of after one or more specified number of uses. The base portion supports the reservoir and the needle inserter device, while the durable portion supports a drive device for selectively driving the infusion medium out of the reservoir and into the needle and/or cannula.

Claims

1. A needle injector device for connection in fluid-flow communication with the inlet or outlet port of a reservoir, the needle injector comprising:

a housing having a generally cylindrical interior surface surrounding a generally cylindrical hollow interior volume, the generally cylindrical interior surface having a central axis, an inner circumference, a first groove forming a generally spiral path around at least a portion of the inner circumference and a second groove extending in a generally linear path that is generally parallel to the central axis;

a moveable cam member supported for movement with in the interior volume of the housing between a retracted position and an extended position, the cam member having a projection for extending into the first and second grooves, the cam member for supporting a needle for movement with the cam member between the retracted position and extended position;

at least one bias member for imparting on the moveable cam member, a rotary force around the central axis and a linear force in a direction parallel to the central axis, when the moveable cam member is in the retracted position;

a stop structure for engaging and holding the moveable cam member in the retracted position;

wherein, when the moveable cam member is held in the retracted position by the stop surface, the moveable cam member is arranged relative to the generally cylindrical interior surface, to be selectively disengaged from the stop structure and moved from the retracted position to the extended position, in a rotary direction around the central axis and simultaneously in a direction generally parallel to the central axis, while the cam projection follows the spiral path of the first groove; and

wherein, when the moveable cam member is in the extended position, the moveable cam member is arranged relative to the generally cylindrical interior surface, to be moved from the extended position toward the retracted position, in a generally linear direction that is generally parallel to the central axis, while the cam projection follows the generally linear path of the second groove. linear

2. A device according to claim 1, wherein the housing has a first end and a second end and wherein the generally linear path connects to the generally spiral path adjacent the first end and adjacent the second end of the housing.

3. A device according to claim 2, wherein the generally linear path of the second groove has an extension portion that extends toward the first end of the housing a distance beyond the generally spiral path of the first groove and wherein the stop structure comprises a surface of the housing along the extension portion of the second groove.

4. A device according to claim 1, further comprising a needle having a shaft having a piercing end, the needle supported for movement with the cam member such that the piercing end of the needle extends out of the housing, when the cam member is in the extended position.

5. A device according to claim 1, wherein:

the housing has a base end for arranging adjacent a user'"'"'s skin;

the needle shaft has a sufficient length and width relative to a hollow cannula to extend through the hollow cannula and to extend the piercing end of the needle out one end of the cannula, while supporting the cannula on the needle for movement with the needle between the retracted position and the extended position, and to leave the cannula in the extended position in a user'"'"'s skin, when (i) the base end of the housing is arranged adjacent the user'"'"'s skin, (ii) the moveable needle and cannula are in the extended position and (iii) the moveable cam member is moved from the extended position toward the retracted position, while the cam projection follows the generally linear path of the second groove.

6. A device according to claim 1, wherein the at least one bias member comprises a coil spring.

7. A device according to claim 1, wherein the at least one bias member comprises a coil spring having a first end fixed relative to the cam member and a second end fixed relative to the housing, adjacent one end of the housing.

8. A needle injector device for connection in fluid-flow communication with the inlet or outlet port of a reservoir, the needle injector comprising:

a housing having a generally cylindrical interior surface surrounding a generally cylindrical hollow interior volume, the generally cylindrical interior surface having a central axis and an inner circumference;

a moveable cam member supported for movement within the interior volume of the housing between a retracted position and an extended position, wherein either one of the interior surface of the housing or the cam member has a groove and the other has a projection for extending within the groove, and wherein the groove or projection on the interior surface of the housing forms a generally spiral first path around at least a portion of the inner circumference of the interior surface of the housing and a generally linear second path that is generally parallel to the central axis;

at least one bias member for imparting on the moveable cam member, a rotary force around the central axis and a linear force in a direction parallel to the central axis, when the moveable cam member is in the retracted position;

a stop structure for engaging and holding the moveable cam member in the retracted position;

wherein, when the moveable cam member is held in the retracted position by the stop surface, the moveable cam member is arranged relative to the generally cylindrical interior surface, to be selectively disengaged from the stop structure and moved from the retracted position to the extended position, in a rotary direction around the central axis and simultaneously in a direction generally parallel to the central axis, while the groove or projection on the cam member follows the spiral first path; and

wherein, when the moveable cam member is in the extended position, the moveable cam member is arranged relative to the generally cylindrical interior surface, to be moved from the extended position toward the retracted position, in a generally linear direction that is generally parallel to the central axis, while the groove or projection on the cam member follows the generally linear second path.

9. A device as recited in claim 8, wherein the cam member has the projection and the interior surface of the housing has the groove and wherein the first path comprises a generally spiral-shaped groove in the interior surface of the housing and the second path comprises a generally linear groove in the interior surface of the housing.

10. A device as recited in claim 9, wherein the generally linear groove connects to the generally spiral groove adjacent each end of the housing.

11. A device as recited in claim 8, wherein the generally linear second path connects to the generally spiral first path adjacent each end of the housing.

12. A device according to claim 8, further comprising a needle having a shaft having a piercing end, the needle supported for movement with the cam member such that the piercing end of the needle extends out of the housing, when the cam member is in the extended position.

13. A device according to claim 8, wherein:

the housing has a base end for arranging adjacent a user'"'"'s skin;

the needle shaft has a sufficient length and width relative to a hollow cannula to extend through the hollow cannula and to extend the piercing end of the needle out one end of the cannula, while supporting the cannula on the needle for movement with the needle between the retracted position and the extended position, and to leave the cannula in the extended position in a user'"'"'s skin, when (i) the base end of the housing is arranged adjacent the user'"'"'s skin, (ii) the moveable needle and cannula are in the extended position and (iii) the moveable cam member is moved from the extended position toward the retracted position.

14. A device according to claim 8, wherein the at least one bias member comprises a coil spring.

15. A device according to claim 8, wherein the at least one bias member comprises a coil spring having a first end fixed relative to the cam member and a second end fixed relative to the housing, adjacent one end of the housing.

16. A needle injector device for connection in fluid-flow communication with the inlet or outlet port of a reservoir, the needle injector comprising:

a housing having a generally cylindrical interior surface surrounding a generally cylindrical hollow interior volume, the generally cylindrical interior surface having a central axis and a generally linear channel extending in a direction generally parallel to the central axis;

a rotary cam member supported for rotary movement about the central axis within the interior volume of the housing, the rotary cam member having a cam surface that is arranged at an obtuse angle relative to the central axis;

a needle having a shaft providing with a piercing end and a second, opposite end, the second end of the needle arranged to abut the cam surface, during rotary movement of the cam member about the central axis, wherein the needle is arranged relative to the generally linear channel, to be guided by the generally linear channel for movement between a retracted position and an extended position upon rotation of the rotary cam member; and

a bias member operatively connected to the rotary cam member, to impart a rotational force on the rotary cam member, to selectively move the needle between the retracted position and the extended position.

17. A device according to claim 16,

a releasable lock structure arranged to hold at least one of the bias member and the rotary cam member against the rotational force of the bias member and to be selectively released to allow the bias member to rotate the rotary cam member about the central axis.

18. A device according to claim 16, wherein the housing has a base having an aperture through which the needle extends, when the needle is in the extended position.

19. A device according to claim 16, wherein:

the housing has a base end for arranging adjacent a user'"'"'s skin;

the needle head is secured to the cam surface; and

the needle shaft has a sufficient length and width relative to a hollow cannula to extend through the hollow cannula and to extend the piercing end of the needle out one end of the cannula, while supporting the cannula on the needle for movement with the needle between the retracted position and the extended position, and to leave the cannula in the extended position in a user'"'"'s skin, when (i) the base end of the housing is arranged adjacent the user'"'"'s skin, (ii) the moveable needle and cannula are in the extended position and (iii) the rotary cam member is rotated to pull the needle from the extended position to ward the retracted position.

20. A device according to claim 16, wherein the bias member comprises a coil spring.

21. A device according to claim 16, wherein the bias member comprises a coil spring having a first end fixed relative to the rotary cam member and a second end that is fixed relative to the housing.