摘要:
Apparatus and methods are provided for providing access to a body lumen. The apparatus includes a tubular member including a proximal end, a distal end sized for insertion into a body lumen, and a lumen extending therebetween. A pushable stiffening member extends from the distal end of the tubular member. An expandable sheath extends along at least a portion of the stiffening member, the sheath being expandable from a contracted condition to facilitate insertion into a body lumen, and an enlarged condition wherein the sheath at least partially defines a lumen communicating with the tubular member lumen. A distal portion of the sheath is steerable, e.g., using a pull wire disposed within a lumen of the sheath or within the stiffening member. In addition or alternatively, the stiffening member may be biased to a predetermined shape to facilitate introduction.
摘要:
A hub for a sheath, catheter, or other tubular device includes a first hub portion including a first hub lumen sized for receiving a medical device therethrough, and a second hub portion including a second hub lumen, the second hub portion coupled to the first hub portion such that the first and second hub lumens are aligned with one another and the first and second hub portions are spaced apart from one another to define a gap. A valve is secured within the gap between the first and second hub portions that includes a valve passage therethrough, e.g., for accommodating receiving a medical device through the first and second hub lumens into the tubular device, while providing a substantially fluid tight seal. For example, the valve passage may include a bore extending partially from a first end of the valve towards a second end of the valve, and a slit that extends from the end of the bore to the second end of the valve.
摘要:
Apparatus and methods are provided for substantially continuously forming thin-walled sleeves that may be incorporated into tubular devices sized for introduction into a patient. In one embodiment, a pair of sheets including coated surfaces oriented towards one another are directed through a cutting apparatus to cut the sheets into multiple pairs of strips. The pairs of strips are bonded together to create a plurality of sleeves having lumens defined by the coated surfaces. In another embodiment, a sheet having a coated surface is fed through a cutting tool to separate the sheet into a plurality of strips, and the strips are formed into sleeves, e.g., by feeding the strips through a die or mandrel using a substantially continuous process. Optionally, the sleeves may be subsequently cut into individual tubular devices and/or further processed, e.g., by providing one or more layers around the sleeves to create catheters, sheaths, or other apparatus.
摘要:
Apparatus and methods are provided for making coated liners and/or tubular devices including such coated liners. A sleeve may be provided that includes an outer first surface and an inner second surface extending between first and second ends thereof, and a hydrophilic or other coating may be applied to the first. The coated sleeve may be cut between the first and second ends to create opposing edges extending between the first and second ends, and the cut sleeve may be reversed such that the coated first surface defines an inner surface and the opposing edges are disposed adjacent one another, thereby providing a coated liner. Optionally, a tubular structure, e.g., one or more reinforcing layers and/or or outer layers may be attached around the coated liner, thereby providing a tubular device including an inner surface with a desired coating.
摘要:
Material transport catheters and methods for their use rely on rotation of an impeller within a catheter body and a clearing element for preventing buildup of materials at the opening of the catheter body. The impeller preferably comprises an inner tube or shaft having a helical rotor formed over an outer surface thereof. The clearing element may comprise a free end of a structure near the distal end of the catheter body for disrupting clot, wherein the free end of the structure extends into the distal opening of the catheter body to break up materials as the impeller is rotated. Alternatively, the clearing element may comprise a cutting member disposed at the distal opening of the catheter body.
摘要:
Apparatus and methods are provided for providing access to a body lumen. The apparatus includes a tubular member including a proximal end, a distal end sized for insertion into a body lumen, and a lumen extending between the proximal and distal ends. A pushable stiffening member extends from the distal end of the tubular member, the elongate member terminating in a distal tip. An expandable sheath extends along at least a portion of the stiffening member, the sheath being expandable from a contracted condition to minimize a profile of the sheath to allow insertion along with the stiffening member into a body lumen, and an enlarged condition wherein the sheath at least partially defines a lumen communicating with the tubular member lumen. In one embodiment, the sheath includes an outer lumen and an inner lumen floating within the outer lumen, and the stiffening member is carried in the inner lumen.
摘要:
A sheath for delivering a lead or other device into a body lumen is adapted to be removed from around the delivered lead or device via a longitudinally extending feature. This feature of the sheath may be a ripcord, a seam or interlocking features the releasably engage one another.
摘要:
A system and/or apparatus for delivering a medical device into a body includes an elongate tubular member and a valve fitted within a proximal end thereof. The valve preferably includes a tubular body and a flap, wherein the tubular body is engaged within the proximal end of the tubular member and has an open end approximately aligned with a proximal termination of the proximal end of the tubular member. The flap of the valve preferably extends over a hole formed in an end wall of the tubular body opposite a side of the end wall that faces a passage of the tubular body, which passage extends between the open end and the end wall. The hole communicates with the passage and with the lumen of the tubular member, and the flap is movable away from the hole when the device is introduced through the passage and the hole.
摘要:
Material transport catheters and methods for their use rely on rotation of an impeller within a catheter body. The impeller preferably comprises an inner tube or shaft having a helical rotor formed over an outer surface thereof. Optionally, in the case of a tubular shaft, a second helical rotor may be provided within the shaft lumen in order to induce flow in opposite or in the same direction as induced by the outer helical rotor. Catheters may further comprise structures near their distal ends for disrupting clot, and are preferably introduceable over guidewires where the helical rotors are rotated directly over the guidewire. The catheters may include two or more impellers or impellers having two or more rotors in order to provide for circulation of materials at a target site within a patient body lumen.
摘要:
Clot disruption and dissolution are achieved using a catheter having both an agitator and the ability to deliver a thrombolytic agent. The catheter is introduced to a target region with a blood vessel and the agitator manipulated to engage and disrupt a region of clot therein. The thrombolytic agent, such as tPA, streptokinase, or urokinase, is directly released into the clot at the point where the agitator is engaging the clot. In this way, the thrombolytic activity of the agent is enhanced and the dissolution of the clot is improved.