Extended use medical device
First Claim
1. A medical device for administering drug therapy to a user over an extended period of use, said medical device comprising:
- a pump mechanism for administering a drug to the user;
first and second delivery cannulas for infusing said drug transdermally into the user at first and second infusion sites;
first and second mechanisms for separately controlling deployment of the first and second cannulas into said user at said first and second infusion sites; and
a flow sensing unit for detecting whether the first infusion site is no longer viable by sensing whether the first delivery cannula is blocked or otherwise incapable of delivering a desired flow of drug to the user;
wherein the first delivery cannula is retracted from the user when the flow sensing unit detects that the infusion site is no longer viable.
1 Assignment
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Accused Products
Abstract
Provided is an extended use self-contained, wearable medical device. The device is preferably configured with an infusion deployment mechanism for variably inserting and retracting an infusion needle to different depths, or completely retracting the infusion needle from the infusion site and then re-inserting the infusion needle after a predetermined period of time, throughout an infusion cycle for extending the viability of the infusion site. Another embodiment comprises dual needle deployment mechanisms which may also variably insert and retract the infusion needles. A flow sensor is preferably provided for detecting the stoppage of flow through the infusion cannula and signaling the needle deployment mechanism to attempt infusion at a different depth or to deploy a second infusion needle. A re-fillable reservoir assembly is preferably provided for supplying a drug over the extended use of the device. Another embodiment comprises a partially reusable and partially disposable medical device implementing the above features.
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Citations
17 Claims
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1. A medical device for administering drug therapy to a user over an extended period of use, said medical device comprising:
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a pump mechanism for administering a drug to the user; first and second delivery cannulas for infusing said drug transdermally into the user at first and second infusion sites; first and second mechanisms for separately controlling deployment of the first and second cannulas into said user at said first and second infusion sites; and a flow sensing unit for detecting whether the first infusion site is no longer viable by sensing whether the first delivery cannula is blocked or otherwise incapable of delivering a desired flow of drug to the user; wherein the first delivery cannula is retracted from the user when the flow sensing unit detects that the infusion site is no longer viable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A medical device for administering drug therapy to a user over an extended period of use, said medical device comprising:
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a pump mechanism for administering a drug to the user; a delivery cannula for infusing said drug transdermally into the user at an infusion site; and a mechanism for controlling deployment of the cannula into said user, wherein said mechanism is configured to variably move said cannula to a first depth in the user and a second depth in the user;
wherein the mechanism is adapted to move the cannula from said first depth to said second depth after said cannula has been at said first depth for at least one day. - View Dependent Claims (15, 16)
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17. A medical device for administering drug therapy to a user over an extended period of use, said medical device comprising:
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a pump mechanism for administering a drug to the user; a delivery cannula for infusing said drug transdermally into the user at an infusion site; and a mechanism for controlling deployment of the cannula into said user, wherein said mechanism is configured to automatically move said cannula from a first depth in the user to a second depth in the user.
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Specification