Blood irrigated tip with internal rotating fluid control
Publication Date: 2007-Aug-31
The IP.com Prior Art Database
Millions of Americans suffer from cardiac arrhythmia (irregular heart rhythm). One of the first fully automated ablation system supporting an open-loop irrigated catheter is now available in the U.S is the system incorporates the Thermocool Irrigated Tip Catheter and Coolflow Pump from Biosense Webster, Inc., with the Stockert RF Generator. As an alternative to this existing technology, an ablation catheter design having an irrigation tip is disclosed to create successful ablations with fluid flow. By controlling a revolving auger inside the tip that in turn control the flow of fluid inside and outside the tip and in combination of regulating the wattage and in turn the energy (e.g., RF energy), you can create a lesion with the depth and breadth as required. What is unique to this design is that it does not use saline and it takes advantage of the fluid in the heart to cool the tip. Although open-ended irrigation catheters are currently the market (such as the Thermocool Catheter), there are other ways to make a cool tip catheter that will perhaps function easier and have equal, if not better results. Ways of controlling the flow of fluid that is not dependent on a pump and is simpler in function than the Thermocool. One method is the use of an auger in the tip that captures the blood/heart fluid and forces it out in a constant flow action that actually originates in the tip. In can be understood that the fluid is sucked from the proximal end of the tip then from there it is force out the multiple holes in the distal section of the tip. For clarity see attached drawings. Boston Scientific's Chilli II catheter uses fluid to cool the tip internally not externally. This design will cool the tip internally and externally and could prevent charring. But this design application is dependent on an outside reservoir. This design application uses what is in the body to cool the tip. The unique Irrigated Tip Catheter that this invention disclosure covers is designed to maintain safe tip-to-tissue temperatures using a revolving auger that circulates the blood around the tip at an extremely rapid rate to transfer the temperature to the blood. Ultimately reducing the risk of coagulum and char from high-temperature ablation. In contrast to the current invention, the Thermocool Catheter requires the Coolflow Pump and the Stockert RF Generator work in tandem allowing the physician to deliver desired power at a constant rate which could make it more cumbersome. The proposed auger design can increase or slow down the flow giving you greater temperature control. And it is not dependent on the pump and could be controlled independently. Conventional ablation catheters can reach temperatures as high as 65°C, representing a danger to patients. It can be seen that 65°C is considerably above 37°C. It can also be seen that 42°C is above 37°C. If the heat exchange can take advantages of the bodies natural temperature, adding saline to the body would not be required.