Field-effect transistor and method for manufacturing the same

A method for manufacturing a field-effect transistor includes the steps of forming a source electrode and a drain electrode each containing hydrogen or deuterium; forming an oxide semiconductor layer in which the electrical resistance is decreased if hydrogen or deuterium is added; and, causing hydrogen or deuterium to diffuse from the source electrode and the drain electrode to the oxide semiconductor layer.

INITIATING MEDICAL SYSTEM COMMUNICATIONS

A medical system includes a body-contacting signal source adapted to transmit an oscillatory signal though a body to a transducer of a device implanted therein. A detector that is coupled to the transducer, upon detection of a response of the transducer to the signal, activates a radio-frequency (RF) telemetry component of the device.

Rotary shaver with improved connection between flexible and rigid rotatable tubes

An rotary shaver having an attachment device for coupling a flexible transmission shaft to rigid ends. In at least one embodiment, the rotary shaver may be a curved rotary shaver. The inner shaft may be formed from rigid ends connected together with the flexible transmission shaft via an attachment device. The attachment device may include a collar protruding from an outer surface to penetrate an inner surface of the flexible transmission shaft. The attachment device may also include one or more grooves or protrusions for the transmission of torque.

Valve prosthesis fixation techniques using sandwiching

A prosthesis is provided for implantation at a native semilunar valve of a native valve complex. The prosthesis includes a distal fixation member, configured to be positioned in a downstream artery, and shaped so as to define exactly three proximal engagement arms that are configured to be positioned at least partially within respective ones of semilunar sinuses, and, in combination, to apply, to tissue that defines the semilunar sinuses, a first axial force directed toward a ventricle. The prosthesis further includes a proximal fixation member coupled to the distal fixation member, the proximal fixation member configured to be positioned at least partially on a ventricular side of the native semilunar valve, and to apply, to the ventricular side of the native valve complex, a second axial force directed toward the downstream artery, such that application of the first and second forces couples the prosthesis to the native valve complex.

Valve fixation member having engagement arms

Apparatus is provided including a prosthesis for implantation at a native semilunar valve of a native valve complex of a subject, the native valve complex having semilunar sinuses, the prosthesis including a valve prosthesis support, which includes a support structure including at least two engagement arms. Upon implantation of the prosthesis, each of the engagement arms is at least partially disposed within a respective one of the semilunar sinuses. A shape of at least one of the engagement arms is generally characterized by a function z″(r)>=0, where z is a height of any given point on the at least one engagement arm measured along a longitudinal axis of the prosthesis, and r is a distance from the longitudinal axis to the given point. Other embodiments are also described.

Leaflet-sensitive valve fixation member

A prosthesis is provided for implantation at a native semilunar valve of a native valve complex. The prosthesis includes a distal fixation member, configured to be positioned in a downstream artery, and to apply a first axial force directed toward a ventricle. The prosthesis further includes a proximal fixation member coupled to the distal fixation member, the proximal fixation member configured to be positioned at least partially on a ventricular side of the native valve complex, and to apply a second axial force directed toward the downstream artery, such that application of the first and second forces couples the prosthesis to the native valve complex by axially sandwiching the native valve complex from a downstream side and the ventricular side thereof. The prosthesis is configured, upon implantation thereof, to embrace, without squeezing, leaflets of the native semilunar valve. Other embodiments are also described.

Axial-force fixation member for valve

A prosthesis is provided for implantation at a native semilunar valve of a native valve complex. The prosthesis includes a distal fixation member, configured to be positioned in a downstream artery, and to apply a first axial force directed toward a ventricle. The prosthesis further includes a proximal fixation member coupled to the distal fixation member, the proximal fixation member configured to be positioned at least partially on a ventricular side of the native valve complex, and to apply a second axial force directed toward the downstream artery, such that application of the first and second forces couples the prosthesis to the native valve complex by axially sandwiching the native valve complex from a downstream side and the ventricular side. A ratio of the first axial force to a radial force applied outwardly by the prosthesis against the native semilunar valve is greater than 1.5:1. Other embodiments are also described.

Valve prosthesis implantation techniques

A method is provided, including providing a semilunar valve prosthesis, and implanting the prosthesis without using any imaging techniques. Another method is provided, including providing a semilunar valve prosthesis, placing the prosthesis in a body of a subject, and determining a correct rotational disposition of the prosthesis with respect to a semilunar valve site based on tactile feedback. Other embodiments are also described.

Sinus-engaging valve fixation member

A prosthesis is provided for implantation at a native semilunar valve of a native valve complex, the native valve complex having three semilunar sinuses and three native commissures. The prosthesis includes a valve prosthesis support, which comprises a support structure comprising exactly three engagement arms that meet one another at three respective junctures. The engagement arms are shaped so as define three peak complexes at the three respective junctures, and three trough complexes, each of which is between two of the peak complexes. Upon implantation of the prosthesis, each of the engagement arms is at least partially disposed within a respective one of the semilunar sinuses, such that each of the peak complexes is disposed distal to and in rotational alignment with a respective one of the native commissures, and each of the trough complexes is disposed at least partially within the respective one of the semilunar sinuses.

Transcutaneous analyte sensor

The present invention relates generally to systems and methods for measuring an analyte in a host. More particularly, the present invention relates to systems and methods for transcutaneous measurement of glucose in a host.