Abstract: Embodiments of the invention provide a system for temperature control of the human body. The system includes an indwelling catheter with a tip-mounted heat transfer element. The catheter is fluidically coupled to a console that provides a heated or cooled heat transfer working fluid to exchange heat with the heat transfer element, thereby heating or cooling blood. The heated or cooled blood then heats or cools the patient's body or a selected portion thereof. In particular, strategies for optimizing the rewarming of patients for various medical procedures are provided, including stroke, neurosurgery, and myocardial infarction.

Abstract: An IEEE 1394 compliant wireless bridge for connecting local area network segments in multiple rooms. A pair of transceiver units each comply with IEEE 1394 for connectivity and communication with local area network devices. The transceiver units operate using high frequencies and low power levels over very short ranges to communicate data and control signals between rooms. Transmissions are short range and highly directional and thereby do not interfere with other local transmissions.

Abstract: A method and apparatus for performing hypothermia of a selected organ without significant effect on surrounding organs or other tissues. A flexible coaxial catheter is inserted through the vascular system of a patient to place the distal tip of the catheter in an artery feeding the selected organ. A chilled perfluorocarbon fluid is pumped through an insulated inner supply conduit of the catheter to cool a flexible bellows shaped heat transfer element in the distal tip of the catheter. The heat transfer bellows cools the blood flowing through the artery, to cool the selected organ, distal to the tip of the catheter.

Abstract: To reduce power consumption of a communications interface between a network and a processor, a method for controlling the interface monitors data traffic from sides of the interface. Upon detecting a predetermined period of no data traffic on both sides, the method disables an auto-negotiation mode of the interface and forces the interface to operate at its lowest speed. Prior to changing speed, the method may briefly remove a link signal or electrically isolate the network and the network interface to allow a peer to adapt to a new speed. When in the low speed mode, the method monitors data on both the processor side and the network side. Upon detecting a predetermined and configurable amount of data, the method enables the auto-negotiate mode. Prior to increasing the speed, the method may briefly remove a link signal to allow a peer to adapt to the new speed. Hysteresis may be included to prevent a speed change if a predetermined period has not occurred since a last speed change.

Abstract: In a cable modem system, a method and apparatus is provided to reduce the time to ascertain modem failure by sensing ranging nonresponses and increasing the frequency of the ranging invitations upon detection of a predetermined number of nonresponses. The increased frequency of ranging invitations decreases the time required to ascertain modem failure, modem failure being defined to be a predetermined number of nonresponses, for instance 16. In so doing, a system is provided which minimizes the bandwidth necessary for rapid modem failure detection.

Abstract: A method and apparatus is provided for heating or cooling at least a selected portion of a patient's body. The method begins by inserting a catheter having a balloon into the colon or stomach of the patient. A heated or chilled fluid is conducted through a supply lumen of the catheter and into the balloon. The fluid is evacuated from the balloon through a return lumen of the catheter.

Abstract: A telephony system 10 having automatic timing adjustment for diverse routing of HFC systems has a signal stream routing through a signal line loop between a head-end 120 and at least one communication unit 16, i.e., a cable modem cable access unit (CAU). If a fault occurs within the signal line loop, recognized by the head-end 120 when a short uplink burst from the communication unit 16 does not align within a predetermined timing window based on a value in the database, the head-end will adjust the cycle through predetermined delay parameters, corresponding to various alternate signal line loops made up of redundant signal lines. An information processor is provided at the head-end 120 of the HFC system 10 for automatically adjusting the timing of the signal stream in order to maintain the database determined at the information processor at the head-end 120. The timing adjustment of the signal stream is communicated between the head-end 120 and the communication units, CAUs 16.

Abstract: An intravascular heat transfer device is provided with a mixing-inducing surface formed by an easily manufacturable process. The device can have a plurality of elongated, articulated segments, each having a mixing-inducing exterior surface. A flexible joint connects adjacent elongated, articulated segments. The device may be conveniently formed, e.g., by vapor deposition or molding, and further lacks undercuts so that the same may be conveniently removed from, e.g., a two-part mold.

Abstract: A catheter system and method are provided which change the temperature of a fluid, such as blood, by heat transfer. Selective cooling or heating of an organ may be performed by changing the temperature of the blood feeding the organ. The catheter system includes an inlet lumen and an outlet lumen structured and arranged to carry a working fluid having a temperature different from the adjacent blood. The outlet lumen is configured to induce turbulence in the adjacent fluid passing adjacent the outlet lumen.

Abstract: A heat transfer device has first and second elongated, articulated segments, each having a turbulence-inducing exterior surface. A flexible joint connects the first and second elongated, articulated segments. An inner coaxial lumen is disposed within the first and second elongated, articulated segments.

Abstract: A lightweight cathode ray tube is formed by reducing a cross-sectional area on the apeture grill tapes in the aperture grill. One exemplary embodiment of the reduced cross-sectional area aperture grill tape includes a central longitudinal channel in a side of the aperture grill tape that faces away from the screen. The reduction in cross-sectional area reduces a linear density of the tape thereby decreasing the tension required by the frame. As each of the aperture grill tapes includes this central longitudinal channel, the weight of the overall aperture grill is significantly reduced and the aperture grill frame weight is reduced due to the lower aperture grill tension. A method for producing the reduced cross-sectional area aperture grill tape is possible without significantly increasing the cost of manufacturing the aperture grill tape.

Abstract: A catheter system and method are provided which change the temperature of a fluid, such as blood, by heat transfer. Selective cooling or heating of an organ may be performed by changing the temperature of the blood feeding the organ. The catheter system includes an inlet lumen and an outlet lumen structured and arranged to carry a working fluid having a temperature different from the adjacent blood. The outlet lumen is configured to induce turbulence in the adjacent fluid passing adjacent the outlet lumen.

Abstract: A heat transfer device has first and second elongated, articulated segments, each having a turbulence-inducing exterior surface. A flexible joint connects the first and second elongated, articulated segments. An inner coaxial lumen is disposed within the first and second elongated, articulated segments. The inner coaxial lumen is capable of transporting a pressurized working fluid to a distal end of the first elongated, articulated segment.

Abstract: A catheter system and method are provided which change the temperature of a fluid, such as blood, by heat transfer. Selective cooling or heating of an organ may be performed by changing the temperature of the blood feeding the organ. The catheter system includes an inlet lumen and an outlet lumen structured and arranged to carry a working fluid having a temperature different from the adjacent blood. The outlet lumen is configured to induce turbulence in the adjacent fluid passing adjacent the outlet lumen.

Abstract: A depression in the windings of a horizontal coil at a predetermined location in a deflection yoke of a cathode ray tube corrects for multiple types of mis-convergence. In particular, the depression in the windings is disposed in a “neck” portion of the deflection yoke, which incorporates a horizontal deflection coil disposed on a saddle type mold die. A deflection yoke for deflecting electron beams of a color CRT includes a horizontal deflection coil disposed on a saddle type mold die that has a funnel section and a neck section connected along a horizontal axis parallel to the centerline of the deflection yoke. A portion of the neck section of the deflection yoke includes an offset relative to the profile (relative to the horizontal axis) of the windings of the horizontal coil that creates a depressed area in the windings of the horizontal deflection coil.

Abstract: A high gain wide-band width RF amplifier 120 with automatic bias supply regulation. The load supply is actively adjusted in response to the amplifier's output signal level. At small output signals effective load supply voltage is minimum and at larger output signals the effective load supply voltages is maximized. The amplifier 120 includes a differential pair of field effect transistors (FETs) 102, 104 connected at common source connection 106 and biased by current bias FET 108 which is connected between common source connection 106 and amplifier signal input RFIN. A bias voltage (VB1) is applied to the gate of bias device 108 and an automatic gain control voltage (VAGC) is applied to the gates of differential FET pair 102, 104. The automatic bias supply circuit 122 is an active load and includes resistors 124, 126, capacitor 128 and a differential amplifier 130. Capacitor 128 is connected between the negative input 132 and the output 134 of differential amplifier 130.

Abstract: The present invention provides an enhanced method and device to inhibit or reduce the rate of restenosis following angioplasty or stent placement. The invention involves placing a balloon tipped catheter in the area treated or opened through balloon angioplasty immediately following angioplasty. The balloon, which can have a dual balloon structure, may be delivered through a guiding catheter and over a guidewire already in place from a balloon angioplasty. A fluid such as a perfluorocarbon may be flowed into the balloon to freeze the tissue adjacent the balloon, this cooling being associated with reduction of restenosis. The catheter may also be used to reduce atrial fibrillation by inserting and inflating the balloon such that an exterior surface of the balloon is in contact with at least a partial circumference of the portion of the pulmonary vein adjacent the left atrium.

Abstract: The invention provides a method and device for selectively controlling the temperature of a selected organ of a patient for performance of a specified application. The method includes introducing a guide catheter into a blood vessel. The guide catheter may have a soft tip and a retaining flange, and may be used to provide treatments such as administration of thrombolytic drug therapies, stenting procedures, angiographic procedures, etc. A supply tube is provided having a heat transfer element attached to a distal end thereof. The heat transfer element having a plurality of exterior surface irregularities, these surface irregularities having a depth greater than the boundary layer thickness of flow in the feeding artery of the selected organ. The supply tube and heat transfer element may be inserted through the guide catheter to place the heat transfer element in the feeding artery of the selected organ.

Abstract: A comparator (30) is connected through switches (13, 14 and 15) with two or more drive-only pins, and the comparator 30 is shared by two or more drive-only pins by changing the switches (13, 14 and 15). The switches are changed one by one and the signal judgment system deskew is carried out on the drive-only pin, which is connected with the comparator. Then, the switches are changed one by one similarly and the signal supply system deskew is carried out using the result of the signal judgment system deskew. Even if the semiconductor IC tester has the drive-only tester pins, the timing adjustment can be performed by carrying out the signal judgment system deskew and the signal supply system deskew.

Abstract: A method for providing real-time multimedia conferencing services is described over a hybrid network, consisting of packet-switched nonguaranteed quality of service local area networks and a cell-switched wide area network having a multimedia bridge connected to the wide area network. The local area networks and the multimedia bridge are interconnected to the wide area network via routers. New architectural entities within the multimedia bridge execute a multimedia performance and resource analysis algorithm and determine whether the network and the bridge have sufficient resources to satisfy the requirements of the multimedia conference call. If sufficient resources are not available, it is determined whether the requirements for the higher priority services can be provided by preempting the lower priority resources.