摘要:
A tissue ablation apparatus comprises a first elongated delivery device including a lumen and an obturator with a tissue piercing distal end. The obturator is positionable in the lumen of the first elongated delivery device. A second elongated delivery device is positionable in the lumen of the first elongated delivery device. An energy delivery device is positionable in the second elongated delivery device. The energy delivery device includes at least a first and a second RF electrode each with a tissue piercing distal portion. The first and second RF electrodes are positionable in the second elongated delivery device in a compacted state and deployable from the second elongated delivery device with curvature in a deployed state. The first and second RF electrodes exhibit a changing direction of travel when advanced from the second elongated delivery device to a selected tissue site. At least one infusion port is coupled to one of the first elongated delivery device, the second elongated delivery device, the energy delivery device, the first RF electrode or the second RF electrode. An electrode advancement member is coupled to the first and second RF electrodes. The advancement member is configured to advance the RF electrode out of the elongated delivery device.
摘要:
A method of creating a lesion in tissue with infusion includes providing an apparatus comprising a first elongated delivery device with a lumen, an obturator with a second elongated delivery device and an energy delivery device positional in a lumen of the first elongated delivery device. The energy device includes at least a first and a second RF electrode each with a tissue piercing distal portion, the first and second RF electrodes being deployable from the first elongated delivery device with curvature in a deployed state. The energy delivery device includes an infusion lumen and at least one infusion port. The obturator and second delivery device are introduced to a selected tissue site. The obturator is removed from a lumen of the second delivery device and the first delivery device and energy delivery device are introduced into the lumen of the second delivery device. The first and second RF electrodes are advanced from the first delivery device to at least partially surround a target tissue site. The target tissue site is at least partially infused with an infusion fluid. Energy is delivered from the energy delivery device to the target tissue site and cell necrosis is created at the target tissue site.
摘要:
A communication cable includes at least a first and a second twisted pairs of conductors. The first twisted pair of conductors is covered by a first insulation material, and the second twisted pair of conductors is covered by a second insulation material that is different than the first insulation material. The second twisted pair of conductors has a signal phase delay that is substantially equal to the signal phase delay of the first twisted pair of conductors such that the skew of the cable is substantially zero. In certain embodiments, the first insulation material is a fluoropolymer. In such embodiments, the second insulation material may be a nonfluoropolymer. In addition, the twist lay of the first twisted pair of conductors may be different than the twist lay of the second twisted pair of conductors. Moreover, the thickness of the first insulation material may be different than the thickness of the second insulation material.
摘要:
An ablation apparatus has an expandable member that is inserted into an organ of a body and ablates all or a selected portion of the inner layer of the organ. Electrolytic solution fills the expandable member, and the expandable member includes a plurality of apertures from which electrolytic solution flows from the expandable member. First and second fluid conduits, which can be first and second conforming members, are in a surrounding relationship to the expandable member. The second conforming member, including a conductive surface, is made of a material that provides substantial conformity between the conductive surface and a shape of the inner layer of the organ. A plurality of electrodes is positioned between the two conforming members. The expandable member serves as an insulator to RF energy. Each electrode includes an insulator formed on a surface of the electrode positioned adjacent to the second conforming member. The combination of sandwiching the electrodes between the two conforming members, and the use of two insulators, one on the electrode and the other on the expandable member, provides selectable ablation of the inner layer of the organ. A feedback device is included and is responsive to a detected characteristic of the inner layer. The feedback device provides a controlled delivery of RF energy to the electrodes.
摘要:
The diagnostic unit 1 consists of a microprocessor-based control section 5, a data memory 6 and a pacemaker 7. The control section 5 monitors heart action using the intracardiac electrogram and a second signal representative of intracardiac pressure. It detects events of interest to clinicians including bradycardia, tachycardia, cardiac pauses, pressure pauses, interference and pacing pauses, and records the numbers of each type of event. Selective recordings of the waveforms of the sensed signals are made in memory within the unit whenever an event of interest is detected. The unit is worn by the patient for periods of up to three weeks, and the parameters of the events to be sensed can be programmed into the unit by the clinician using a computer 4. The same computer 4 is used to extract and display the recorded data.
摘要:
A tracking system for a solar collector is disclosed. The tracking system includes at least two polarization cameras and a tracking controller configured to: determine orientations of maximal intensity of polarized light received from the at least one heliostat mirror; generate radial lines based on the orientation of maximal intensity of polarized light from the at least one heliostat mirror; determine a position of the sun based on an intersection of the radial lines; and re-orient the at least one heliostat mirror based on the determined position of the sun. In the preferred embodiment, the sun position may be determined based on radial lines corresponding to three or more cameras mounted around the receiver aperture.
摘要:
Aspects of the present disclosure include a system comprising a computer-readable storage medium storing at least one program and a method for managing access permissions associated with data resources. Example embodiments involve evaluating user access permissions with respect to shared data resources of a group of network applications. The method includes receiving a request, from one of the network applications, to access a particular data resource. The request includes an identifier of a requesting user. The method further includes accessing a policy object associated with the data resource that includes policy information specifying operations the user is authorized to perform with respect to the data resource based on satisfaction of one or more conditions. The method further includes evaluating the user's access permissions with respect to the data resource based on the policy object, and communicating a response to the network application that includes the access permission of the user.
摘要:
The present invention relates to the use of a compound comprising a moiety of formula (I) as a reagent for protecting a thiol group in a thiol compound wherein X, X′ and Y are as defined herein. The protecting group methodology of the present invention allows straightforward and selective protection of thiol groups. Cleaving of the thiol group to regenerate the thiol functional group is also facile and controllable. The present invention further provides an analogous protecting group methodology directed to protection of disulfide groups.
摘要:
Techniques are disclosed for connecting a user to all of his resources (e.g. remote desktop or remote application) in a deployment of server farm(s). The user's client sends a message to the deployment requesting any disconnected resources for the user and/or any active resources communicating with a different client. The deployment determines what those resources are, then strips out redundant information (e.g. two resources are remote applications executing within the same session) and sends a stripped list to the client, which reconnects. The client first reconnects to a resource that is not a VM and stores any user input (e.g. credentials) prompted for during that log in. Then, it reconnects to the other resources in parallel, using in these later reconnections any input received from the client during the first reconnection.