摘要:
Devices and methods are provided for the controlled release or exposure of reservoir contents. The device includes a substrate, a plurality of reservoirs in the substrate, reservoir contents disposed in the reservoirs, discrete reservoir caps covering each reservoir to seal the reservoir contents in the reservoirs, and control circuitry for selectively disintegrating the reservoir caps to release or expose the reservoir contents in vivo. At least one of the reservoir caps comprises a first electrically conductive layer coated with one or more protective layers. In one embodiment, the control circuitry comprises an electrical input lead and an electrical output lead connected to and directly contacting each of said reservoir caps and a source of electric power for applying an electrical current through each reservoir cap in an amount effective to rupture each of the reservoir caps.
摘要:
An implantable medical device is provided for controlled delivery or exposure of reservoir contents. The device may include a substrate; a plurality of discrete reservoirs in the substrate, wherein the reservoirs have interior walls and at least one opening in the substrate; reservoir contents disposed in the reservoirs; a reservoir cap closing the at least one opening of each of the reservoirs to seal the reservoir contents in each of the reservoirs; and control circuitry for selectively disintegrating the reservoir caps to release or expose the reservoir contents in vivo, wherein the interior walls of the reservoirs comprise a material to protect the substrate in vivo. For example, to enhance the resistance of the substrate to etching in vivo, the interior sidewalls of the reservoirs may include a protective coating (such as gold, platinum, carbon, silicon carbide, silicon dioxide, or platinum silicide), or the sidewalls may include a doped silicon.
摘要:
Devices, such as medical devices, are provided which include a body portion having at least one reservoir which has two or more openings, the two or more openings being defined in part by a reservoir cap support; reservoir contents, such as a drug formulation or sensor, disposed inside the reservoir; and a reservoir cap which closes off the two or more reservoir openings. The reservoir cap, which can be ruptured, controls release or exposure of the reservoir contents. In one embodiment, the device is an implantable medical device and provides for the controlled release of drug or exposure of a sensor.
摘要:
Methods and systems are provided for delivering drug to the eye. The method and system may include implanting into the eye a device which comprises two or more discrete reservoirs, each reservoir containing a drug; and directing focused light to the implanted device to open a first one of the reservoirs and thereby permit the drug to diffuse from the first reservoir to the patient's eye.
摘要:
Compression cold welding methods, joint structures, and hermetically sealed containment devices are provided. The method includes providing a first substrate having at least one first joint structure which comprises a first joining surface, which surface comprises a first metal; providing a second substrate having at least one second joint structure which comprises a second joining surface, which surface comprises a second metal; and compressing together the at least one first joint structure and the at least one second joint structure to locally deform and shear the joining surfaces at one or more interfaces in an amount effective to form a metal-to-metal bond between the first metal and second metal of the joining surfaces. Overlaps at the joining surfaces are effective to displace surface contaminants and facilitate intimate contact between the joining surfaces without heat input. Hermetically sealed devices can contain drug formulations, biosensors, or MEMS devices.
摘要:
Electrochemical sensor devices are provided, in various amperometric, potentiometric, and conductometric sensor device configurations. An amperometric sensor device may include a structural body which has at least one reservoir that has at least one opening; a working electrode located within the reservoir; analyte sensor chemistry located within the reservoir and deposited on at least the working electrode; an auxiliary electrode located outside of the reservoir; a reference electrode; at least one reservoir cap closing the opening to isolate the working electrode and analyte sensor chemistry within the reservoir and to prevent an analyte outside of the reservoir from contacting the analyte sensor chemistry; and means for rupturing or displacing the reservoir cap to permit the analyte from outside of the reservoir to contact the analyte sensor chemistry.
摘要:
Arrays of biosensors are provided along with methods for operating the arrays of biosensors. The array of biosensors may include a first reference electrode that is connected to an input of a first control amplifier; a first working electrode and a second working electrode in proximity with the first reference electrode; and a counter electrode that is connected to at least an output of the first control amplifier, where the first control amplifier is operative with the counter electrode to maintain a first specified voltage between the first working electrode and the first reference electrode, and between the second working electrode and the first reference electrode. The array of biosensors optionally may further include a second reference electrode that is connected to an input of a second control amplifier, where the second control amplifier is operative with the counter electrode to maintain a second specified voltage between the first working electrode and the second reference electrode, and between the second working electrode and the second reference electrode.
摘要:
A medical device is provided which may include a reservoir which has an opening and contains a sensor; a reservoir cap closing off the opening to isolate the sensor from an environmental component outside the reservoirs, the reservoir cap being impermeable to the environmental component and adapted to selectively undergo a phase change to disintegrate the reservoir cap and thereby expose the sensor to the environmental component. A method of use may include (i) selectively disintegrating a reservoir cap to expose a sensor which is disposed inside a reservoir of a device implanted in a patient, the disintegrating comprising inducing a phase change in the reservoir cap; and (ii) using the sensor to generate an output signal, wherein the output signal is recorded and stored in a writeable computer memory chips, directed to a microprocessor for immediate analysis and processing, or sent to a remote location away from the device.
摘要:
An implantable medical device is provided for use with an external detector to detect an analyte in vivo. In one embodiment, the device consisting essentially of a substrate; a plurality of discrete reservoirs located in the substrate, each reservoir having at least one opening; a reacting component contained in each reservoir; and at least one non-degradable barrier layer covering each reservoir opening, the barrier layer being permeable to an analyte to be detected, wherein the reacting component remains inside the reservoirs and can react with the analyte to be detected, and wherein the device is adapted for implantation into the body of a patient.
摘要:
Sensor devices and methods are provided for detecting the presence or concentration of an analyte in fluid. The device has a reservoir; a working electrode located within the reservoir, a catalyst covering at least part of the working electrode; an oxygen-generating auxiliary electrode in the reservoir; and a reservoir cap to isolate the working and auxiliary electrodes within the reservoir. The device further includes means for selectively rupturing the cap to permit analyte from outside the reservoir to contact the catalyst. The methods may include in vivo glucose monitoring and may include implanting the device in a patient; disintegrating a reservoir cap to permit glucose to enter the reservoir; generating oxygen using the oxygen-generating auxiliary electrode; and using a working electrode to oxidize hydrogen peroxide produced by the reaction of the oxygen with glucose in the presence of glucose oxidase, and thereby detecting endogenous glucose in the patient.