52 results about "Atherectomy procedure" patented technology

The invention provides a rotational atherectomy device having, in various embodiments, a flexible, elongated, rotatable drive shaft with at least one flexible eccentric enlarged abrading head attached thereto. In other embodiments, the eccentric abrading head is not flexible or partially flexible. At least part of the eccentric enlarged cutting head has a tissue removing surface—typically an abrasive surface. In certain embodiments, the abrading head will be at least partially hollow. When placed within an artery against stenotic tissue and rotated at sufficiently high speeds the eccentric nature of the enlarged cutting head causes the cutting head and drive shaft to rotate in such a fashion as to open the stenotic lesion to a diameter substantially larger than the outer diameter of the enlarged cutting head. Preferably the eccentric enlarged cutting head has a center of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to open the stenotic lesion to a diameter substantially larger than the outer diameter of the enlarged cutting head when operated at high speeds.

Apparatus and method for maximizing efficiency of tissue removal from body passageways is provided. A rotational atherectomy device comprises, inter alia, an elongated, flexible and rotatable drive shaft with an enlarged cutting surface disposed thereon, guide wire and catheter. The distal end of catheter may have a cutting surface cleaner, either attached thereto or integrated therein. The cleaner may be outwardly radially flexible and biased against the drive shaft. The cleaner may be opened to accommodate the enlarged cutting surface for cleaning particles trapped therein as a consequence of abrading as it is either advanced distally over the drive shaft and/or the drive shaft is retracted proximally toward the cleaner to accommodate the diameter of the enlarged cutting section. The cleaner comprises an inner surface having an abrasive surface for mechanically scraping and dislodging material trapped in the enlarged cutting head tissue removing surface.

The invention provides a rotational atherectomy device having, in various embodiments, a flexible, elongated, rotatable drive shaft with at least one asymmetric and at least partially spherical abrading element attached thereto, which comprises an abrasive surface. The abrading element comprises more mass above the drive shaft than below and comprises a flattened side or transverse surface which creates hard cutting edges and spaces the center of mass radially from the rotational axis of the drive shaft. Thus the center of mass is moved vertically and transversely by the structure of the abrading element, conferring geometric and mass eccentricity upon the element. When placed against stenotic tissue and rotated at high speed, the eccentric nature of the abrading element moves along an orbital path, opening the lesion to a diameter larger than the resting diameter of the abrading element.

The invention provides a rotational atherectomy device having, in various embodiments, a flexible, elongated, rotatable drive shaft with at least one flexible or inflexible eccentric enlarged abrading and cutting head attached thereto which comprises an abrasive surface. When placed against stenotic tissue and rotated at high speed, the eccentric nature of the abrading and cutting head moves along an orbital path, opening the lesion to a diameter larger than the resting diameter of the enlarged abrading and cutting head. Preferably the abrading and cutting head has a center of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to travel along an orbital path. The abrading and cutting head comprises proximal and/or distal radiused surfaces that facilitate cutting difficult stenosis material while minimizing trauma to the vessel. In some cases, the abrading and cutting head is made from a relatively dense metal.

A surgical apparatus for removing deposits from an interior of a vessel including an outer member and a rotatable shaft having a lumen to receive a guidewire. The lumen has a cross-sectional dimension to enable fluid injection between an inner diameter of the shaft and an outer diameter of the guidewire. A tip is mounted to the shaft for rotation about its longitudinal axis and mounted such that the distal opening of the shaft is axially spaced from a distal internal surface of the tip such that fluid injected through the lumen of the shaft contacts the distal internal surface of the tip and is redirected proximally to direct in a proximal direction deposits removed by the rotational movement of the shaft. The tip includes including a guidewire lumen for receiving a guidewire to enable over the wire insertion of the apparatus.

Various embodiments of devices and systems comprising a polymer driveshaft for use in high-speed rotational medical procedures, e.g., atherectomy, are disclosed. Generally, the primary driveshaft for transferring torque and activating rotation of a tool attached thereto, e.g., an abrasive element, is constructed with at least a polymer outer and inner surface. In certain embodiments, the polymer driveshaft may comprise a metallic band for fixed attachment of a structure, e.g., an abrasive element, thereto. Various embodiments may comprise a coupler that connects a drive shaft connected with a prime mover, e.g., a turbine or electric motor, with the polymer drive shaft, the coupler comprising openings through the coupler wall to the inner diameter of the coupler to allow fluid flow to the inner diameter of the coupled polymer drive shaft.

An atherectomy device for removing deposits such as plaque from an interior of a vessel including an outer member, an inner member and a rotatable shaft positioned for rotational movement within the inner member. The outer and inner members are fixed axially. A rotatable tip is mounted to the distal region of the rotatable shaft for rotation about its longitudinal axis upon rotation of the shaft to remove deposits from the vessel.

The invention provides a system, device and method for localized application of therapeutic agents within a biological conduit. A preferred biological conduit comprises a blood vessel. A preferred device comprises a high-speed rotational atherectomy device having, in various embodiments, a flexible, elongate non-rotatable therapeutic agent delivery sheath having a lumen therethrough and a flexible, elongated, rotatable, drive shaft with at least one flexible eccentric enlarged abrading head disposed within lumen of the delivery sheath. The operator may actuate a controlled amount or dose of one or more therapeutic agents to release from the distal end of the delivery sheath lumen during high-speed rotation of the drive shaft. The therapeutic agent(s) is thus released into a turbulent fluidic environment resulting from high-speed rotation and orbital motion of the eccentric abrading head, which aids to drivingly urge the therapeutic agent(s) radially through the boundary layer of fluid flow in the conduit and into the target region of the conduit wall.

A device for modifying a body lumen of a mammal in need thereof is provided, comprising a helically-cut tube comprising cutting teeth, said helically-cut tube substantially coaxial with the longitudinal axis of said device, a ramp wire that is displaced from the longitudinal axis of said device over at least a portion of said ramp wire and is enclosed by said helically-cut tube over at least a part of the length of said ramp wire, a drive rod wherein the broach may be moved proximally, distally, and/or radially via proximal, distal, and radial motions, respectively, of the drive rod. Also provided are methods for using the device.

An atherectomy device with an exchangeable drive shaft is disclosed, having a drive shaft gear at a distal end of the exchangeable drive shaft for meshing engagement with a prime mover gear on the output shaft of the prime mover. The exchangeable drive shaft is inserted into an opening at the distal end of the handle housing and moved axially in a proximal direction. Surface features on at least the prime mover housing and the engageable drive shaft help to align the drive shaft gear with the prime mover gear for meshing engagement.

The present invention is directed in various methods, devices and systems relating to rotational atherectomy. More specifically, an oscillating driver is connected to a drive shaft, or torque transfer tube, with abrasive element mounted thereon. The result provides a rotational working diameter for the rotating abrasive element that is larger than its resting diameter. Generally, the preferred abrasive element is concentric in profile and/or with center of mass collinear with the drive shaft's rotational axis. However, eccentric abrasive elements, both in terms of offsetting center of mass and/or geometric eccentricity may also be employed.

An atherectomy device with an exchangeable drive shaft is disclosed, having a drive shaft gear at a distal end of the exchangeable drive shaft for meshing engagement with a prime mover gear on the output shaft of the prime mover. The exchangeable drive shaft is inserted into an opening at the distal end of the handle housing and moved axially in a proximal direction. Surface features on at least the prime mover housing and the engageable drive shaft help to align the drive shaft gear with the prime mover gear for meshing engagement.

An atherectomy device with an exchangeable drive shaft is disclosed, having a drive shaft gear at a distal end of the exchangeable drive shaft for meshing engagement with a prime mover gear on the output shaft of the prime mover. The exchangeable drive shaft is inserted into an opening at the distal end of the handle housing and moved axially in a proximal direction. Surface features on at least the prime mover housing and the engageable drive shaft help to align the drive shaft gear with the prime mover gear for meshing engagement.

The present invention is directed in various methods, devices and systems relating to rotational atherectomy. More specifically, an oscillating driver is connected to a drive shaft, or torque transfer tube, with abrasive element mounted thereon. The result provides a rotational working diameter for the rotating abrasive element that is larger than its resting diameter. Generally, the preferred abrasive element is concentric in profile and/or with center of mass collinear with the drive shaft's rotational axis. However, eccentric abrasive elements, both in terms of offsetting center of mass and/or geometric eccentricity may also be employed.

An atherectomy device for removing deposits such as plaque from an interior of a vessel including an outer member and a rotatable shaft positioned for rotational movement within the outer member. The outer member is fixed axially. A rotatable tip is mounted to the distal region of the rotatable shaft for rotation about its longitudinal axis upon rotation of the shaft. The rotatable shaft includes a guidewire lumen for receiving a guidewire to enable over the wire insertion of the device.

The present system is directed in various embodiments to methods, devices and systems for rotational atherectomy procedures. More specifically, embodiments comprise a rotational driver with rotational drive shaft and abrasive element attached thereto, the rotational driver being controlled by the rotational controller to rotate at unsustained low rotational speeds and/or rotational direction.

An atherectomy device with an exchangeable drive shaft is disclosed, having a drive shaft gear at a distal end of the exchangeable drive shaft for meshing engagement with a prime mover gear on the output shaft of the prime mover. The exchangeable drive shaft is inserted into an opening at the distal end of the handle housing and moved axially in a proximal direction. Surface features on at least the prime mover housing and the engageable drive shaft help to align the drive shaft gear with the prime mover gear for meshing engagement.