Devices and methods for delivering fluids to tissue during ablation therapy

Devices and methods for delivering fluid to tissue during ablation therapy are described herein. An example device can include an elongate body having an internal cavity, an outlet port, and an ablation element configured to heat tissue. The flow resistance of the elongated body can increase in a proximal-to-distal direction along a length of the elongated body containing the outlet port. This can be achieved, for example, by varying the size or relative spacing of the outlet ports, reducing the cross-sectional area of the inner cavity through which fluid can flow, or limiting the ratio between the total area of the outlet ports and the cross-sectional area of the inner cavity, by using a flow diverter or tapering the inner cavity sidewalls. Adjusting the flow resistance of the elongate body can provide a more uniform fluid distribution or a desired non-uniform distribution. 本文描述了用于在消融治疗期间将流体输送到组织的装置和方法。示例性装置能够包括具有内部腔体的细长主体、出口端口和被构造成加热组织的消融元件。细长主体的流动阻力能够沿着细长主体的包含出口端口的长度在从近侧向远侧的方向上增加。这能够例如通过如下方式来实现：改变出口端口的大小或相