摘要:
A catheter delivered device to close a septal defect, the device comprising a cylindrical shaft of metal or polymeric material with concentric parallel cuts through the wall of the device which create flattened support struts. The center of the support struts move radially away from the axis in a hinge like fashion in response to the movement of the device's proximal and distal ends toward the center of the device. This movement is reversibly effected through mechanical means. The device can be coated with growth factors, mitogenic factors or other determinants which can improve tissue growth such that tissue ingrowth can occur over a period of time. The catheter itself may be an ultrasonic imaging catheter.
摘要:
Percutaneous treatment of aortic aneurysms and like vascular anomalies by an apparatus and method wherein the apparatus is delivered via catheter and comprises a sleeve with at least one peripheral conduit which is caused to assume an expanded, rigid configuration by the introduction of a chemical or mechanical hardening means, whereby the sleeve is caused to assume an open cylindrical configuration for fluid flow therethrough.
摘要:
A catheter delivered device to close a septal defect, the device comprising a cylindrical shaft of metal or polymeric material with concentric parallel cuts through the wall of the device which create flattened support struts. The center of the support struts move radially away from the axis in a hinge like fashion in response to the movement of the device's proximal and distal ends toward the center of the device. This movement is reversibly effected through mechanical means. The device can be coated with growth factors, mitogenic factors or other determinants which can improve tissue growth such that tissue ingrowth can occur over a period of time. The catheter itself may be an ultrasonic imaging catheter.
摘要:
A balloon catheter is provided having an expandable distal portion and balloon protector means comprising a first removable sleeve having a variable inner diameter to ease sliding the first sleeve over the balloon, and an optional second removable (outer) sleeve positioned over the inner sleeve, the second (outer) sleeve having a constrictive relationship with the first (inner) sleeve, said first and second sleeves being removed prior to use of the catheter. A stent delivery system is provided to facilitate introduction and placement of a stent, and includes a catheter having an expandable distal portion constructed and arranged for expanding the outer diameter of the catheter from a contracted state to an expanded state, said distal portion further comprising a balloon and at least one dam over which the balloon extends, and a stent positioned around the distal portion of the catheter around the balloon or gripper linear control device, said stent having a contracted condition, being sized in the contracted condition to closely surround the balloon in the contracted state, and being expandable to an expanded condition; a first removable (inner) sleeve in the region of the distal portion of the catheter positioned around the stent (and between the dams where the device comprises two dams), said first sleeve comprising a first end, a second end and a variable inner diameter to ease sliding the sleeve over the balloon and stent; an optional second removable (outer) sleeve positioned over the stent, first sleeve and at least one dam, said second (outer) sleeve having a constrictive relationship with the first (inner) sleeve, whereby when compressed by the outer sleeve, the inner sleeve will have an inner diameter approximately equal to or less than the outer profile of the collapsed balloon over the at least one dam, said first and second sleeves being removed prior to use of the stent delivery system and release of the stent by expansion of the balloon.
摘要:
The present invention provides a method and apparatus in a memory controller coupled between a system bus and memory for independently supporting one of a Synchronous DRAM (SDRAM) and an Asynchronous DRAM (ADRAM) memory type via common signal pins. According to the preferred embodiment, the memory controller comprises memory control logic for generating both SDRAM and ADRAM memory interface signals and multiplexing means for selecting as output onto common signal pins either set of interface signals depending upon a memory type setting programmed within a configuration register. The memory control logic comprises at least a request processor in addition to two memory state machines, one for SDRAM and the other for ADRAM memory operations. When a system bus request is received by the request processor, it is assigned to a request state machine which interacts with both the SDRAM state machine and the ADRAM state machine to generate two sets of memory interface signals in addition to two sets of internal control signals. The sets of signals are input to a multiplexor provided for each type of control signals (i.e., memory interface and internal control), which multiplexors are controlled by the memory type select signal output from the configuration register. Based on the memory type setting programmed into the configuration registers, the appropriate sets of memory interface and internal control signals (i.e., either SDRAM or ADRAM) are selected for output to the memory array and to other units of the memory controller, respectively.
摘要:
Percutaneous treatment of aortic aneurysms and like vascular anomalies by an apparatus and method wherein the apparatus is delivered via catheter and comprises a sleeve with at least one peripheral conduit which is caused to assume an expanded, rigid configuration by the introduction of a chemical or mechanical hardening means, whereby the sleeve is caused to assume an open cylindrical configuration for fluid flow therethrough.
摘要:
A method of molding the main body of a Y-adapter that has a straight passageway extending from one extremity to the other and an arcuate passageway that is generated along the arc of a circle. Core pins for the straight and arcuate passageways are placed in a mold such that they merges together to form a single, smooth lumen in the Y-adapter. The arcuate core pin can be withdrawn from the finished Y-adapter as a result of its circular arc.
摘要:
A guide catheter in which the components of the hub include a ratchet mechanism that is operative to lock the hub components together and compress an integral flange of the catheter shaft therebetween to form a seal between the hub and catheter shaft without the use of bonding agents that will not become loosened accidently or inadvertently.
摘要:
A medical device has a catheter with a proximal portion, a distal portion, a shaft and an expandable member located at the distal portion. The expandable member is constructed and arranged for expanding the outer diameter of the catheter from a contracted state to an expanded state. A removable sleeve is positioned around the entire length of the expandable member. The sleeve has a first end and a second end, and an inner diameter that increases over the entire length of the sleeve.