摘要:
A stiffenable balloon catheter assembly capable of being converted from an “over-the-wire” mode with respect to a guidewire extending therethrough to a “rapid-exchange” mode with respect to a guidewire extending therethrough, and vice versa. The catheter has a plurality of lumens, one lumen however, having a side opening with an obstructable galp, the orientation of which, determines the utilization “mode” of the catheter assembly. Stiffening stylets may be adjustably locked into the lumens, depending upon the “mode”, to control the stiffness of the catheter assembly during its utilization within a patient.
摘要:
Wires are used for conducting ultrasound energy. These wires achieve optimum properties by creating a multiple material coaxial construction. For example, in a particular embodiment it is desirable to have an elastic core (nitinol) for conducting axial vibrations (sonic or ultrasonic) and a thin stiff cladding (stainless steel) in order to minimize traverse vibrations which result in loss of energy.
摘要:
An acoustic imaging system for use within a heart has a catheter (6), an ultrasound device (10) incorporated into the catheter (6), and an electrode (300, 304, 334, 394) mounted on the catheter (6). The ultrasound device (10) directs ultrasonic signals toward an internal structure in the heart to create an ultrasonic image, and the electrode (300, 304, 334, 394) is arranged for electrical contact with the internal structure. A chemical ablation device (55, 86, 314, 396) mounted on the catheter (6) ablates at least a portion of the internal structure by delivery of fluid to the internal structure. The ablation device (55) may include a material that vibrates in response to electrical excitation, the ablation being at least assisted by vibration of the material. The ablation device may alternatively be a transducer (414) incorporated into the catheter (6), arranged to convert electrical signals into radiation and to direct the radiation toward the internal structure. The electrode may be a sonolucent structure (304, 334) incorporated into the catheter (6).
摘要:
An expansible balloon catheter has at least a first exterior surface with a given coefficient of friction and a second exterior surface with a greater coefficient of friction. In a compact form only the first exterior surface is exposed to produce a low coefficient of friction during transfer of the collapsed or uninflated balloon to and across a lesion. When inflated, the second surface dominates the first surface and produces an increased coefficient of friction overall thereby to stabilize the balloon in the lesion.
摘要:
A catheter device and method for heating tissue, the device having a catheter shaft constructed for insertion into a patient's body, and at least one chamber mounted on the catheter shaft. The catheter shaft has at least one lumen for fluid flow through the shaft. The chambers are defined by walls that are at least in part expandable. Fluid flows, through the lumens, between the chambers and a fluid source outside the body. The chambers can be filled with the fluid after they have been placed within the body. A heating device heats liquid within at least one of the chambers, so that heat is transmitted from the liquid to surrounding tissue by thermal conduction through the wall of the chamber. Means are provided for selectively directing heat transmission toward a selected portion of surrounding tissue. The chambers are fillable with fluid separately from each other, so that the chambers can occupy any of a plurality of possible total volumes. By selecting the total volume of chambers, compression of the tissue can be controlled, and hence the effectiveness of transfer of heat to the tissue can be controlled. According to the method, the catheter device is used to heat tissue from within a duct in a patient's body. The chambers are inserted into the duct and filled with fluid. Liquid is heated within at least one of the chambers, and heat is selectively directed toward a selected portion of surrounding tissue.
摘要:
A microbiological sampling device has inner and outer catheter tubes with a specimen sampling brush within the inner catheter body. A plug of water soluble material closes a distal end of the outer catheter body to prevent contamination of the inner catheter body and the brush during introduction into an organism, as for example, when placed in the lungs. The plug can be ejected and the sampling brush extended within the lungs to enable the brush to collect uncontaminated bacteria samples which are brushed into the inner body whereupon the entire assembly can be withdrawn. The plug protects the specimen sampling brush during introduction and is readily dissolvable avoiding unwanted biological problems, yet sealing the assembly against contamination.
摘要:
A stiffenable balloon catheter assembly capable of being converted from an “over-the-wire” mode with respect to a guidewire extending therethrough to a “rapid-exchange” mode with respect to a guidewire extending therethrough, and vice versa. The catheter has a plurality of lumens, one lumen however, having a side opening with an obstructable galp, the orientation of which, determines the utilization “mode” of the catheter assembly. Stiffening stylets may be adjustably locked into the lumens, depending upon the “mode”, to control the stiffness of the catheter assembly during its utilization within a patient.
摘要:
An electro-surgical device for performing tissue resection and cauterization includes an elongated body, a pair of arms extending from a distal end of the elongated body, and an electrode in communication with the pair of arms. The elongated body is adapted to be coupled to a source of energy at a proximal end. The electrode has a first region coated with an insulative coating and a second region for focusing energy emission. The coating can be a diamond-like carbon coating or other coating exhibiting resistance to cracking at high temperatures and high voltages. The coating can be deposited on a base section of a loop electrode while the end sections remain free of the coating. Alternatively, the coating can be unevenly deposited on the electrode. In other embodiments, the electrode can comprise a rollerball and the insulative coating can be deposited on selected or random portions of the rollerball. The insulative coating prevents energy loss to fluid and tissue during the operation, thus allowing resection and cauterization to be efficiently performed.
摘要:
An expansible balloon catheter with a stent thereon has at least a first exterior surface with a given coefficient of friction and a second exterior surface with a different coefficient of friction. In a compact form only the first exterior surface is exposed to produce one coefficient of friction during transfer of the collapsed or uninflated balloon and stent to and across a lesion. When inflated, the second surface dominates the first surface and produces a second coefficient of friction.
摘要:
A catheter for insertion into a bodily conduit, especially an artery. The catheter comprises a shaft (26) having at least one lumen (24) for delivery of a fluid inflation media and a double balloon (12) including an array (20) of a plurality of inflatable secondary chambers (22) radially disposed in a cylindrical array around an inflatable primary chamber (16). Each of the secondary chambers (22) shares a common wall (38) with adjacent secondary chambers (22) and a common wall (14) with the primary chamber (16). The secondary chambers (22) are inflated by an array of channels (32) which are separated from each other by webs (40). One or more of the secondary chambers (22) may be in communication with a pressure transducer for measurement of the resistance of, e.g., a stenosis to dilation by the balloon (12). Alternately, a triple balloon (60) has inner secondary chambers (22a) and outer secondary chambers (22b). Also alternately, one or more of the secondary chambers (22) may be adapted to dispense medication. A method for treating a constricted bodily conduit using the catheter is also disclosed.