736 results about "Variable stiffness" patented technology

A catheter system for localized or semi-localized administration of agents through the wall of a blood vessel is provided. Various catheter system constructions which use at least one expandable occluding device to create an isolated region are provided. Constructions using one catheter and one occlusion device are provided, along with constructions using two catheters and multiple occlusion devices. The catheter system may include a catheter with a variable stiffness along its length. The catheter system may also include a guide wire integrated with an inner catheter. The catheter can infuse the agent into the blood vessel in a pressure regulated manner. Methods for delivery and infusion of the agent within a blood vessel are also provided.

A reinforced catheter having a multi-layered structure suitable for medical uses comprising an inner liner, a braided reinforced layer adjacent to the inner liner, a first resin adjacent to the braided layer, and a harder second resin overlaying the first resin; wherein, the first resin and second resin taper inversely to one another along the length of the catheter, thereby forming a co-tapered soft tip that reduces body trauma.

A personal digital device comprises a variable stiffness screen capable of varying its display size by managing its stiffness, and a body carrying means for wireless communication and for storing and processing information. The functional flexibility of the screen allows for creating an adjustable visual interface between the user and the device: with the screen inside the device for compact storage, and with the screen extended to display high-quality graphics and images. In some particular embodiments the device incorporates a detachable audio unit allowing configuration of the user audio interface depending on the specifics of usage.

An embolic coil which may be placed at a preselected location within a vessel comprising a helically wound coil in which various combinations of adjacent turns are spot welded together to create a stretch resistant coil of a preselected flexibility.

A catheter comprising an outer shaft comprising a first section of electroactive polymer. The first section of electroactive polymer affecting either the flexibility of the catheter or the steerability of the catheter.

A variable stiffness screen for wearable electronic devices provides a viewable area that can be adjusted by managing the screen's physical properties. The screen incorporates a flexible electronic display, attached to a structural system, in which the physical properties can be changed from a flexible state to a rigid one to control the stiffness of the display.

Catheters having selectively insertable or selectively activatable and releasable stiffening mechanisms are provided. In general, the catheter is inserted, navigated and withdrawn from a subject in a relaxed, flexible condition and stiffening mechanisms are deployed to prevent the catheter from shifting during placement or operation of an accessory device or tool through the catheter. Stiffening members(s) may be inserted into and removed from one or more longitudinal channel(s) provided in proximity to the catheter wall and generally coaxial with the primary catheter lumen to change the stiffness properties of the catheter. The properties, configuration and size of the stiffening members and channels may be varied to vary the stiffness properties of the catheter and stiffening members may be constructed from materials having shape change properties or materials that change conformation or stiffness with application of heat, current or electrical field. Stiffening mechanisms may also employ energy absorbing and viscoelastic polymer materials having variable stiffness properties depending on ambient conditions.

A shaft for a medical device includes an outer sheath and a flexible spiral wrap therein. The flexibility of the spiral wrap is modified by changing the width of the wraps of a spiral, the thickness of the wraps of a spiral, or the gap spacing of the spiral. The spacing between wraps is maintained by attaching the spiral wrap to the cover sheath that surrounds the spiral wrap at two or more locations.

Embodiments of the present invention comprise a fiber optic guidewire having a hypotube with a plurality of openings that provide variable stiffness and tracking characteristics between at least one proximal segment and one distal segment of the guidewire. In some embodiments, the guidewire further comprises a mandrel disposed within the hypotube, the mandrel cooperating with the optical fibers to permit the distal end of the hypotube to be shaped as desired by a user. Methods of manufacturing and using the guidewire are also disclosed.

Tubular baseball bats comprised of an elongated handle portion and a striking or barrel portion wherein the barrel portion has variable stiffness along its length. One such bat has a circumferential low cost, low weight stiffener generally located in the sweetspot area designed to increase radial stiffness in a controlled manner which results in decreasing the bat performance to meet a changed bat performance standard and can be applied at low cost to both used field returned bats and bats being newly manufactured. Further, new tubular polymer composite bats can be designed with increased radial stiffness generally located in the sweetspot area or with radial stiffness graduated from highest, generally in the sweetspot area, to lowest at the barrel ends. All bats of the present invention result in calculated bat performance to meet applicable regulatory standards while also increasing the sweetspot size.

A squeeze film damper assembly having a variable stiffness and damping control. The squeeze film damper includes a damper chamber formed by two flexible bellows chambers of the sides. A first pressure source is applied to the damper chamber to regulate the damping. A second pressure source is applied to the flexible bellows chambers to vary the stiffness of the damper. The flexible bellows chambers are secured between an outer member and an inner member of the damper assembly and form the sealed damper chamber. A pressure ratio between the bellows chambers and the damper chamber can vary to control the stiffness of the squeeze film damper.

An intravascular delivery catheter includes a middle member or manipulator to ameliorate the effect of buckling of the graft cover during the tracking or positioning of the delivery device within a body flow lumen to deploy an exclusion device, such a stent graft. The delivery device/catheter includes a region or regions of lower resistance to bending than other portions of the delivery device, which are positioned, within the delivery device, to preferentially bend the delivery system at locations where buckling will have minimal effect upon the deployment of the exclusion device from the delivery system. The preferential bending is accomplished, by providing a middle member/manipulator that is a rod with laterally oriented slots, having different depth and spacing configurations, or by using a wire coil as a portion of the middle member where the variable stiffness is created either by providing a variable/multiple coil diameter or by using a wire having a variable diameter along its length while the wire coil diameter is relatively uniform.

The present invention relates to a disposable absorbent article comprising a chassis defining a front waist region, a back waist region, and a crotch region disposed between the front waist region and back waist region. The article includes a fastening system that includes one or more fastening devices, each having at least one tab member configured to releasably connect to a slot member when, for instance, fastening the article to the body of the wearer. A variable stiffness member is associated with at least a portion of the fastening device that, in response to a predetermined external stimulus, reduces its stiffness to correspondingly reduce the stiffness of the fastening device.

A vibration-based power generator has a variable stiffness oscillator connected to a base. The oscillator comprises an inertial mass moving relative to the base in response to vibrations. The oscillator has a neutral position corresponding to a position of the oscillator when no vibrations are transmitted to the base. The oscillator has a first position where the mass is at a first distance and a second position where the inertial mass is at a second distance from a position of the mass when the oscillator is in neutral position. The second distance is greater than the first distance. A stiffness of the oscillator at the second position is greater than a stiffness of the oscillator at the first position. A transducer generating electric power in response to movement of the inertial mass is associated with the oscillator. A method of optimizing a vibration-based power generator is also presented.

The invention discloses a variable stiffness lower limb external skeleton robot which comprised a back plate, a flexible waist adjusting mechanism, hip joint mechanisms, thighs, knee joint mechanisms,shanks, ankle joint mechanisms, two driving degrees of freedom and three driven degrees of freedom. A driving control system is arranged on the back plate, the flexible waist adjusting mechanism is fixed with the back plate and connected with the thighs through the hip joint mechanisms, and the thighs are connected with the shanks and the ankle joint mechanisms through the knee joint mechanisms.According to the variable stiffness lower limb external skeleton robot, driving is performed by the aid of a variable stiffness driver, so that the robot is smooth in movement and high in safety, physical structures of lower limbs of human bodies can be effectively fitted by the aid of the two driving degrees of freedom and the three driven degrees of freedom, length adjusting mechanisms are arranged at the waists, the thighs and the shanks, so that the robot can adapt to physical sizes of different users, and the robot is wearable and has flexibility in the movement by the aid of the flexiblewaist adjusting mechanism. The robot can be applied and popularized in aspects of rehabilitation training, boosting and the like.

A catheter having an elongated shaft and a balloon on a distal shaft section, the elongated shaft comprising an outer tubular member, and an inner tubular member which has a bonded portion along which an outer surface of the inner tubular member is bonded to an inner surface of the outer tubular member. The inner tubular member has a proximal portion proximal to the bonded portion, and a distal portion distal to the bonded portion with higher axial compression stiffness and column strength than the proximal portion thereof. The catheter has improved traceability, axial collapse resistance, pushability, and crossability, for improved ability to position the balloon at a desired location in a patient's body lumen.