Abstract:
A fluid injection line contamination inhibitor (30) for an intravascular catheter system (10) includes a first check valve (34A) that is in fluid communication with a fluid source (16). The first check valve (34A) is configured to inhibit contaminants in a fluid injection line (28) from moving upstream to near a subcooler (26). The first check valve (34A) is positioned along the fluid injection line (28) downstream from the subcooler (26). The first check valve (34A) can be positioned between a connection port (36) and the subcooler (26), including near the connection port (36) or at the connection port (36). The fluid injection line contamination inhibitor (30) may further include a second check valve (34B) that is in fluid communication with the fluid source (16). The second check valve (34B) is positioned along the fluid injection line (28) downstream from the subcooler (26) and the first check valve (34A).
Abstract:
Cryotherapeutic systems and cryotherapeutic-system components configured for renal neuromodulation are disclosed herein. A cryotherapeutic system configured in accordance with a particular embodiment of the present technology can include a console having a cartridge housing, a cartridge connector adjacent to the cartridge housing, and a supply passage fluidly connected to the cartridge connector. The console can further include a supply valve along the supply passage and a control assembly including a supply-valve actuator and a user interface. The supply-valve actuator can be operably connected to the supply valve, and the control assembly can be configured to signal the supply-valve actuator to open the supply valve in response to a signal from the user interface.
Abstract:
Die vorliegende Erfindung betrifft ein elektrochirurgisches Gerät zur Devitalisierung von Gewebe. Das elektrochirurgische Gerät umfasst einen Sondenkörper, der mit mindestens einer Elektrode und einer Kühleinrichtung ausgestattet ist. Dieser Sondenkörper ist dazu geeignet, mittels eines HF-Stroms ein Wärmeverteilungsfeld zur Devitalisierung des Gewebes zu generieren. Die Kühleinrichtung verhindert eine Karbonisierung des Gewebes nahe dem Sondenkörper, da hier die maximale Stromdichte auftritt. Erfindungsgemäß wird das elektrochirurgische Gerät derart modifiziert, dass es ermöglicht wird, die Wärmeverteilung über den Sondenkörper einzustellen. Vorzugsweise erfolgt diese Einstellung bzw. Positionierung einer maximalen Kühlzone über das Regeln des Zulaufdrucks, der das elektrochirurgische Gerät mit Kältemittel versorgt.
Abstract:
A cryoprobe for surgical and other treatments. The cryoprobe comprises an expandable section that performs displacement of a distal cryotip forwards when there is elevation of the operation pressure in the interior of the cryoprobe. Needle-wise metal elements are installed on the external side of the cryotip. These needle-wise elements are deflecting outwards by a deflecting member fastened on the distal edge of an external shaft of the cryoprobe. This allows a significant enlargement of the frozen volume of the treated tissue with the same operation temperature and the outer diameter of the cryoprobe. In another embodiment, the needle elements are formed in a displaceable metal sheath and a distal section of a cryotip and/or special protrusions on this distal section act as the deflecting member.
Abstract:
An elongated catheter device with a distal balloon assembly is adapted for endovascular insertion. Coolant injected through the device may, in different embodiments, directly cool tissue contacting the balloon, or may cool a separate internal chamber. Plural balloons may be provided, wherein a secondary outer balloon surrounds a primary inner balloon, the primary balloon being filled with coolant and acting as the cooling chamber, the secondary balloon being coupled to a vacuum return lumen to serve as a robust leak containment device and thermal insulator around the cooling chamber. One or more sensors may be disposed between the balloons or the vacuum return lumen, to detect leaks and control the flow of fluid through the device. Examples of sensors include pressure and temperature sensors, optical sensors, magnetic flow switches and flow meters.
Abstract:
An elongated catheter device with a distal balloon assembly is adapted for endovascular insertion. Coolant injected through the device may, in different embodiments, directly cool tissue contacting the balloon, or may cool a separate internal chamber. In the first case, the coolant also inflates the balloon, and spent coolant is returned to the handle via a return passage extending through the body of the catheter.Plural balloons may be provided, wherein a secondary outer balloon surrounds a primary inner balloon, the primary balloon being filled with coolant and acting as the cooling chamber, the secondary balloon being coupled to a vacuum return lumen to serve as a robust leak containment device and thermal insulator around the cooling chamber. Various configurations, such as surface modification of the balloon interface, or placement of particles, coatings, or expandable meshes or coils in the balloon interface, may be employed to achieve this function.
Abstract:
A method and apparatus for inflating a balloon (14) at a distal portion of an elongated delivery catheter (12) to contact surrounding biological tissue, and expanding a refrigerant adjacent the balloon to cool the biological tissue to render it non-viable. The inflation of the balloon can be accomplished with the expanded refrigerant of with a separate pressurized fluid. The balloon can act as a heat transfer element, or there can be a separate heat transfer element (30) on the catheter adjacent the balloon. The apparatus can be used to perform a dilation procedure, such as angioplasty, in conjunction with cooling of the surrounding tissue.
Abstract:
A method of creating a lesion in cardiac tissue where the method includes deploying a distal treatment section of an ablation catheter into a heart chamber and manipulating the distal treatment section against the cardiac tissue and into a curved shape that encloses a plurality of vessel entries in the heart chamber. The method further includes commencing a first application of ablation energy from the distal treatment section to the cardiac tissue and halting the first application of ablation energy to the cardiac tissue. The first application of ablation energy causes formation of a first continuous lesion in the cardiac tissue that encloses the plurality of vessel entries.
Abstract:
An endovascular near critical fluid based cryoablation catheter for creating an elongated lengthwise-continuous lesion in tissue comprises an elongated shaft, a flexible distal tissue treatment section, and a distal tip. A plurality of flexible tubes extend through the distal treatment section to transport a near critical fluid to and from the distal tip, The distal treatment section is controUably articulated to match the contour of an anatomical region to be treated. In embodiments the distal treatment section includes a superelastic material and assumes a pre-set shape when released from an outer sleeve member. When the catheter is activated, heat is transferred between a target tissue and the distal treatment section of the catheter thereby creating the elongated lengthwise-continuous lesion in the tissue.
Abstract:
A cryoablation apparatus includes a distal energy delivery section to facilitate energy transfer to the tissue, resulting in faster achievement of tissue target temperatures. The energy delivery section includes a first heat exchange region and a second heat exchange region having a different heat exchange efficiency than the first heat exchange region. The first heat exchange region may comprise an increased surface area along a radial portion or length of the cryoprobe in contact with surrounding tissue. The heat exchange region may include ridges, texture, threads, and microtubes which serve to increase the thermal-contacting surface area and provide enhanced cryoenergy to the tissue.