Device and method for needle-less interstitial injection of fluid for ablation of cardiac tissue

A needle-less tissue ablative injector device for injecting a fluid into cardiac tissue, the device comprising:

• a housing having a lumen within for containing the fluid;
• a distal surface operably coupled to the housing for contacting cardiac tissue;
• at least one discharge orifice disposed near the distal surface and in fluid communication with the fluid lumen;
• a pressure applicator in communication with the fluid lumen for imparting sufficient pressure to the fluid lumen to inject the fluid into myocardium from an epicardial surface;
• a pressure applicator switch operably coupled to the pressure applicator for controllably imparting pressure from the pressure applicator to the fluid lumen when the pressure applicator switch is activated;
• a first electrode disposed to contact at least one of the tissue and the fluid lumen;
• an electrical connector in electrical continuity with the first electrode for providing ablative electrical energy to the cardiac tissue;
• an electrical switch operably coupled to the electrical connector for controllably providing the ablative electrical energy to the cardiac tissue when the electrical switch is activated;
• and
• a switch member operably configured to first activate the pressure applicator switch to cause fluid to be injected into the myocardium and subsequently to activate the electrical switch to cause ablative electrical energy to be provided to the cardiac tissue having the injected fluid within, wherein depressing a portion of the switch member to a first position activates the pressure applicator switch and further depressing the same portion of the switch member to a more depressed second position activates the electrical switch.