Abstract:
A coordinate measuring system consists of multiple optical transceivers (transmitter-receivers) mounted onto a stable reference frame such as the walls of a room. The object to be measured is touched with a hand-held measuring probe. To measure, the probe triggers the transceivers to read the distance to two retroreflectors mounted on the probe. The location of the probe tip relative to the reference frame is computed from at least six transceiver readings (three for each retroreflector). The accurate determination of the distance between the transceivers and retroreflectors is done by measuring the phase shift of a high frequency modulation superimposed on light beams. To avoid ambiguity two high frequencies are used, one for coarse and one for fine resolution. The initial location of the transceivers can be found out by measuring an accurately known object and computing the transceiver locations. The transceivers include a beam steering device to track the position of the probe.
Abstract:
A light modulator capable of using large area light sources consists of a light source such as an arc lamp imaged on a two dimensional light valve, preferably of the deformable mirror type. The light valve is imaged onto a light sensitive material and this image is scanned along the light sensitive material. The information to be imaged on the light sensitive material is entered into the first row of the light valve and as the image of the light valve is scanned along the material, the information in the first row is transferred to subsequent rows at a direction and rate keeping the imaged data stationary relative to the exposed material. By using a large number of rows, high light collection efficiency, high resolution and high data rates can be achieved at the same time. This overcomes the low brightness limitations of large area light sources such as arc lamps and incandescent lamps.
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:
The invention uses a scanned two dimensional array of single mode laser diodes to generate a large number of beams scanning a large area of liquid photopolymer. The optical design is further simplified by using interleaved scanning generated by tilring a glass plate. Using a wavelength of 405-410nm allows the use of low cost laser diodes and a simplified optical design.
Abstract:
A perforated separator compartment or liquid permeable bag is attached to the input port in a regular syringe. The perforated compartment only allows liquids to exit the compartment into the main chamber of the syringe, restricting solid particles to the near proximity of the input port of the syringe. When the plunger of the syringe is pressed, the saline solution emerges from holes into the compartment, stirring up the settled particles. As the ejection continues, the compartment is compressed towards the input port by the plunger in order to eliminate any unused volume.
Abstract:
In medical procedures requiring access to the stomach, such as insertion of a nasogastric tube (also known as NG tube), verification is required that the tube has indeed reached the stomach and did not find its way into another organ such as the lungs. The invention provides a simple and foolproof way of establishing that the stomach was reached. The method does not require any additional training of the medical staff. The invention can be used in conjunction with an NG tube and provides feedback to the user when the NG tube is correctly inserted in the stomach by detecting the presence of Gastric acid.
Abstract:
An intra-cardiac mapping system is based on locating the ports through which blood flows in or out the heart chambers. For many procedures, such as ablation to cure atrial fibrillation, locating the pulmonary veins and the mitral valve accurately allows to perform a Maze procedure. The location of the ports and valves is based on using the convective cooling effect of the blood flow. The mapping can be performed by a catheter-deployed expandable net or a scanning catheter. The same net or catheter can also perform the ablation procedure.
Abstract:
A device positionable in a cavity of a bodily organ (e.g., a heart) may discriminate between fluid (e.g., blood) and non-fluid tissue (e.g., wall of heart) to provide information or a mapping indicative of a position and/or orientation of the device in the cavity. Discrimination may be based on flow, or some other characteristic, for example electrical permittivity or force. The device may selectively ablate portions of the non-fluid tissue based on the information or mapping. The device may detect characteristics (e.g., electrical potentials) indicative of whether ablation was successful. The device may include a plurality of transducers, intravascularly guided in an unexpanded configuration and positioned proximate the non-fluid tissue in an expanded configuration. Expansion mechanism may include helical member(s) or inflatable member(s).
Abstract:
The disclosed system improves urine flow by increasing the inside diameter of the urethra going through the prostate by eroding the urethral wall, rather than by reducing the prostate volume. This is done by a specially designed IRE electrode, which limits the penetration depth of the electric field to the urethral wall.
Abstract:
To reduce X-ray exposure while improving image quality, an area of interest is selected in the image. The image of the selected area is updated frequently, comparable to rate of updates used today for the whole image. The rest of the image is updated at a significantly lower rate. Since the area of interest normally is a small part of the overall area, the total exposure is reduced significantly. A fast X-ray shutter, placed near the X-ray source, blocks the radiation from areas outside the area of interest. The shutter automatically retracts when the complete image is updated. The area of interest can be selected by the user or automatically selected based on activity in the image. Since most of the exposures are taken at a reduced collimation angle, limited by the area of interest, the area of interest is imaged at reduced scatter and better quality.