Patch-like infusion device

Abstract

A system and method for a patch-like, self-contained substance infusion device (700) which provides hidden patient needles (760) that includes a rigid bladder (712) used with a non-distensible bladder film (740), such as a metallized film. The device (700) can be attached to skin via an adhesive surface and a push button (780) activation assembly can be used to remove an interlock (730), allowing a disk, or Belleville spring (735) assembly to apply constant pressure to a fluid reservoir assembly (710). The push button (780) assembly allows the release of one or more spring-loaded patient needles (760) into the skin, and establishes a fluid path between the patient needles (760) and the pressurized fluid reservoir thereby delivering an infusion into the skin. The push button (780) activation assembly further allows the release of safety mechanisms (794) which are driven by spring (793) and released by trap-door (790).

Description

technical field [0001] The present invention relates generally to substance delivery devices with improved valves, springs and safety mechanisms, and also to tablet form, self-contained substance delivery devices that can be used to deliver various substances or drugs to patients. This application claims priority under 35 U.S.C. §119(e) over U.S. Provisional Patent Application Serial No. 60 / 494,286, filed August 12, 2003, by Chris Cindrich et al., entitled "Patch-Like Infusion Device," and Priority to U.S. Provisional Patent Application Serial No. 60 / 558,611, entitled "Patch-Like Infusion Device With Improved Valve, Spring And Safety Mechanisms," filed April 2, 2004 by Chris Cindrich et al., incorporated herein by reference, per The entire content of the said patent. This application contains subject matter related to U.S. Nonprovisional Patent Application Serial No. 10 / 623,702, filed July 22, 2003, by Charles D. Shermer et al., entitled "Patch-Like Infusion Device," incorpor...

AI Technical Summary

Problems solved by technology

These devices are simple and inexpensive to use, but they require needle insertion for each injection, usually three to four times a day

Second mode infusion pump therapy, which requires the purchase of an expensive pump that lasts about three years

In theory, this type of device offers many of the advantages of an infusion pump without the added cost and inconvenience

Unfortunately, however, many of these devices suffer from discomfort including (due to the gauge and / or length of the injection needle used), the substance to be delivered and the materials used in the construction of the infusion set. Disadvantages such as compatibility and interaction between devices, and possible malfunction if improperly activated by the user (e.g. "wet" injection due to premature activation of the device)

Difficulties were also encountered in manufacturing and controlling needle penetration depth, especially when using shorter and / or finer gauge needles

The potential for needle sticks to injure people who come into contact with the device used is also a concern

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