Puncture device and puncture apparatus

A puncture apparatus comprising:

• a puncture needle including a needle main body for puncturing a biological tissue, and an extension needle provided for movement relative to the needle main body along a longitudinal direction of the needle main body for puncturing the biological tissue, and extension means for moving the extension needle in a direction toward a distal end of the needle main body with respect to the needle main body to extend the puncture needle, wherein the needle main body and the extension needle each have a curved portion along a longitudinal direction of the needle main body and the extension needle, and the needle main body and the extension needle are individually provided for rotational movement;
• a urethral-insertion member of a longitudinal shape for being inserted into a urethra;
• and
• restriction means for restricting a positional relation between the puncture needle and the urethral-insertion member such that, when the puncture needle rotationally moves and punctures the biological tissue, a needle tip of the extension needle passes from a center of the rotational movement of the puncture needle beyond the urethral-insertion member.

A method of forming a path in living body tissue comprising:

• inserting a urethral-insertion member of a longitudinal shape inserted into a urethra;
• placing a puncture needle of a puncture device into a portion of a living body, the puncture needle including a needle main body for puncturing a biological tissue, and an extension needle having a needle tip, wherein the extension needle moves relative to the needle main body along a longitudinal direction of the needle main body for puncturing the biological tissue, and wherein the extension needle has a hollow portion extending to a proximal end of the needle tip of the extension needle, and the needle tip has an attachment portion formed over a circumference on an outer periphery of the proximal end of the needle tip such that the extension needle is configured to move integrally with the needle main body during an initial state and relative to the needle main body in an extension state, and wherein the needle main body and the extension needle each have a portion, which is curved in an arc along a longitudinal direction of the needle main body and the extension needle;
• restricting a positional relation between the puncture needle and the urethral-insertion member such that, when the puncture needle rotationally moves and punctures the biological tissue, the needle tip of the extension needle passes from a center of the rotational movement of the puncture needle beyond the urethral-insertion member;
• and
• pushing a distal end portion of the extension needle in a direction toward a distal end of the needle main body with respect to the needle main body to extend the extension needle into the living body, and wherein the extension needle moves integrally with the needle main body during the initial state and relative to the needle main body in the extension state.