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Method and surgical instrument for treating prostate tissue including a surgical instrument having a main body, a needle deployment port, a needle, first and second handles and a lockout release mechanism to limit needle extension. Additionally, a kit includes the surgical instrument, together with

Method and surgical instrument for treating prostate tissue including a surgical instrument having a main body, a needle deployment port, a needle, first and second handles and a lockout release mechanism to limit needle extension. Additionally, a kit includes the surgical instrument, together with a cystoscope, and optionally a syringe and reservoir of ethanol. The method includes needle-less injection and visualizing the ethanol injection by delivering both an echogenic agent and ethanol either by needle or needle-less injection or by providing an ultrasonically visible marker near the tip of the ethanol delivery cannula. The method also includes extending the needle transversely of the instrument housing using a link assembly.

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1. A method of injecting a drug into prostate tissue comprisinga. positioning a distal end of an injection head of a surgical instrument adjacent a region of prostate tissue into which it is desired to inject the drug; and b. emitting a high pressure stream of the drug from a aperture in the distal

1. A method of injecting a drug into prostate tissue comprisinga. positioning a distal end of an injection head of a surgical instrument adjacent a region of prostate tissue into which it is desired to inject the drug; and b. emitting a high pressure stream of the drug from a aperture in the distal end of the surgical instrument using needle-less injection and c. injecting echogenic bubbles along with the drug into the prostate tissue, wherein the injection head has a first inlet connected to a high pressure source of the drug and a second inlet connected to a gas delivery tube.2. The method of claim 1 further comprising limiting pressure in the surgical instrument using a pressure of the drug sensitive diaphragm having one side responsive to the drug pressure in the surgical instrument and another side vented to atmosphere and selectively blocking delivery of the drug when the drug pressure exceeds a predetermined level.3. The method of claim 2 further comprising biasing the diaphragm to a predetermined pressure by a spring.4. The method of claim 3 further comprising making the predetermined pressure adjustable.5. The method of claim 1 further comprising indicating when a predetermined pressure is exceeded in the surgical instrument by extending a visually perceptible indicator when the pressure in the instrument exceeds a predetermined level such that the appearance of the indicator corresponds to a pressure in excess of the predetermined level.6. The method of claim 5 wherein the indicator includes a piston and a cylinder and the method further comprises receiving the piston in the cylinder wherein the cylinder has a groove beginning at a starting point and extending a distance along the cylinder such that the drug will leak past the piston via the groove when a predetermined maximum pressure level is reached within the cylinder causing the piston to move past the starting point of the groove.7. The method of claim 1 wherein the drug comprises ethanol and the comprises transurethrally inserting the surgical instrument in step a.8. The method of claim 7 wherein step b further comprises switching between the echogenic bubbles and ethanol.9. The method of claim 7 herein step b further comprises simultaneously delivering the echogenic bubbles and the ethanol via a Y-connection.10. The method of claim 1 further comprising:providing an ultrasonically visible marker near a distal end of a delivery cannula of the surgical instrument for delivering ethanol to the prostate tissue; and observing the marker using ultrasound to position the cannula for delivery of ethanol to a desired location with respect to the prostate tissue. 11. The method of claim 10 wherein step a comprises providing at least one roughened band at the distal end of the cannula.12. The method of claim 10 further comprising providing a resistor located at the distal end of the cannula to provide a temperature signal indicative of the position of the distal end of the cannula.13. The method of claim 10 further comprising providing a piezo oscillator to produce an ultrasonic beacon at the distal end of the cannula.14. The method of claim 1 further comprising forming at least a portion of the injection head of a clear polymer.15. The method of claim 14 further comprising locating an ultrasonically visible marker on the head.