Abstract:
An elastic structure is introduced percutaneously into the left ventricle and attached to the walls of the ventricle. Over time the structure bonds firmly to the walls via scar tissue formation. The structure helps the ventricle expand and fill with blood during the diastolic period while having little affect on systolic performance. The structure also strengthens the ventricular walls and limits the effects of congestive heart failure, as the maximum expansion of the support structure is limited by flexible or elastic members.
Abstract:
Rapid heating of a lithographic printing plate is achieved by feeding the printing plate along a substantially curved path that is adjacent to one or more curved pads of an air bearing that is pressurized with heated air. The one or more curved pads are constructed such that the substantially curved path is curved with an axis of curvature substantially perpendicular to the feed direction of the printing plate. The plate is additionally elastically bent to follow and conform to the substantially curved path. The substantially curved path minimizes printing plate distortion during heating, and thus prevents the plate from being damaged from contact with any of the one or more curved pads. The one or more curved pads are also arranged to allow for exceptionally good heat transfer characteristics and thus more effective plate heating.
Abstract:
The invention can selectively heat a diseased area, such as a tumor, in the body while minimizing heating of healthy surrounding tissue. This is done by exposing the undesired tissue to a scanning focused ultrasound beam arriving from different angular directions at different times, all directions passing through the undesired tissue. The system can scan the target area with low power ultrasound, and then activate the higher power over the selected target areas.
Abstract:
A surgical instrument may be used to apply tension to a flexible suture to close and secure a broken or cut bone (e.g. a sternum following a sternotomy). The device preferably applies an adjustable tension to the flexible suture in order to secure the bone together. Multiple instruments may be used together to ensure the desired tension is applied to the entire bone structure being secured with the flexible sutures. Once the desired tension is achieved, the device preferably provides a mechanism to apply a uniform twist to the flexible suture to lock the flexible suture in place and maintain the tension previously achieved. The device may automatically cut the flexible suture, or the flexible suture may be cut by the surgeon once the twisting action has been performed.
Abstract:
A system for mechanically adjusting medical implants uses an external coil to set up a magnetic field. The magnetic field causes an actuator inside the implant to move in small steps, allowing fine adjustment. The element responding to the magnetic field can be magnetostrictive or SMA based. Large motions are made up from small steps by using two one-way clutches allowing the active element to move small increments in one direction. For SMA based devices, short burst of AC magnetic field are used. For magnetostrictive devices short pulse of unipolar magnetic field are used.
Abstract:
A self-powered pacemaker uses the variations of blood pressure inside the heart or a major artery to create a periodic change in the magnetic flux inside a coil. The pressure variations compress a bellows carrying a magnet moving inside a coil. The inside of the bellows is evacuated to a partial or full vacuum, and a spring restores the bellows to the desired equilibrium point, acting against the blood pressure. The current pulses are stored in a capacitor. Eliminating the battery allows dramatic miniaturization of the pacemaker to the point it can be implanted at the point of desired stimulation via a catheter. The invention includes means of compensating for atmospheric pressure changes.
Abstract:
A device for closing holes tissue is delivered via a catheter to the inside of a body lumen such as a heart. An elastic barbed clip is expanded, pulled into the tissue and released, pulling the tissue with it. The operation is fully reversible.
Abstract:
An apparatus for controlling droplets allows the phase difference between a calibration signal and its signature signal on a detector to be minimized, or the amplitude of the signature signal to be maximized, by adjusting the droplet charging means of the device, or the droplet generation means, and the signals on either. The apparatus converts a stream of fluid into a stream of droplets under the influence of a droplet stimulation signal imposed onto the droplet generating means. Droplets are subsequently signal-wise charged under the influence of a droplet charging signal imposed on the droplet charging means. The charged droplets are then deflected. The calibration signal is imposed onto the stream of droplets. The calibration signal has characteristics that do not appreciably affect the trajectory of the stream of droplets, thereby ensuring that the placement accuracy of the individual droplets is a maintained. The calibration signal further has a signal phase that is independent of the droplet charging signal. A charge detection means is used to extract a charge detection signal from the at least a part of the droplets. The charge detection signal is filtered to extract a signature signal of the calibration signal. The phase control system then varies at least one of the droplet generation means, droplet stimulation signal, droplet charging means and droplet charging signal until the phase between the signature signal and the calibration signal is minimized. A plurality of streams of droplets may be controlled by the method of the invention.
Abstract:
In an inkjet printer there is a trade off between speed and quality. Higher speed can be achieved at the expense of quality as inkjet droplets deposited are distorted in shape and or placement position if the relative velocity between the inkjet nozzles and the printing medium is simply increased. The velocity above which distortion occurs is termed threshold velocity. A feed mechanism that varies the printing medium advance rate to allow printing at below threshold velocity while maintaining a high average feed rate is described. By advancing the printing medium at a periodically varying velocity, with the printing medium velocity lower than the threshold velocity, the problem is avoided.
Abstract:
A deformable mirror element with a high natural frequency has elongate ribbons attached along a longitudinal portion thereof to a support. A reflective wing portion extends laterally from the support and is capable of deforming in response to a force applied to the wing. The deformable mirror element is used in a light valve for modulating one or more beams of light. The high natural frequency of the element ensures that the light valve is useful in applications requiring fast response time.