Temperature responsive systems

• US 7,607,402 B2
• Filed: 11/20/2007
• Issued: 10/27/2009
• Est. Priority Date: 03/23/2001
• Status: Active Grant

• Current Assignee: Dennis N. Petrakis
• Original Assignee: Dennis N. Petrakis
• Inventors: Petrakis, Dennis N.
• Primary Examiner(s): SMITH, RICHARD A
• Application Number:
  US11/984,680
• Publication Number:
  US 20080282962A1
• Time in Patent Office: 707 Days
• Field of Search: 116/216, 116/221, 116/200, 116/207, 116/214, 222/54, 374/106, 374/160, 374/162
• US Class Current: 116/216
• CPC Class Codes: A61M 2205/0266 Shape memory materials
• CPC Class Codes: A61M 31/002 Devices for releasing a drug at a continuous and controlled rate for a prolonged period of time artificial gland structures or devices A61F2/022; intra-uterine contraceptive devices A61F6/14; tampons for introducing into the vagina A61F13/20, A61L15/00; suppositories or bougies for intra-vaginal or intra-uterine application A61K9/02; physical forms of medicinal preparations for sustained or differential drug release A61K9/20, A61K9/50
• CPC Class Codes: G01K 5/483 using materials with a configuration memory, e.g. Ni-Ti alloys

Abstract

A shape memory material activated device of the present invention uses a shape memory material activator to create a path through a shell wall of the device. The path through the shell wall may release a substance contained in the shell or allow a substance to enter the shell. The path may be created by fracturing, puncturing, exploding, imploding, peeling, tearing, stretching, separating, debonding, abrading or otherwise opening the shell and, may be permanent or reversible. The substance may be released in one location while the device is stationary or along a path while it is traveling, self-powered by the shape memory material activator. In addition, the substance may be delivered to an object upon contact with its surface. The self powering abilities allow these devices to be used as substance delivery devices as well as actuators, transporters, and energy conversion systems with modular characteristics and growth potential. The devices may be armed, prior to the beginning of their service life, to be placed in a state of readiness to release their substances once the path is created. Prior to arming they may be maintained at any temperature, incapable of releasing their substances. The devices according to the present invention may be used as temperature sensors or warning devices, drug delivery devices, and the like.

Claims

1. A shape memory material activated device for stimulating the senses, the device comprising:

a shell containing a substance;

a shape memory material activator normally unresponsive to temperature changes thereby creating a dormant state; and

means for deforming the activator in situ by only a single irreversible action while the activator is within a predetermined temperature range,

whereby the device is transformed from a dormant state to an active state wherein the activator responds to temperature changes to create a path through the shell to deliver the substance effectively stimulating at least one of the senses.