The present invention discloses a pressure-depending clutching device for locating and safely positioning a needle in a body cavity. The device is capable of automatically engaging and disengaging the needle from a driving force depending on the pressure experienced by needle. The device has a body with an interior space, a pressure-sensing element disposed in the body defining a portion of a pressure chamber, and a force-receiving element operatively connected to the pressure-sensing element. The force-receiving element has a shape complimentary to a portion of a force-sending element operatively connected to a force-applying structure such as a handle for a user to apply a driving force. The pressure-sensing element, the force-receiving element, and the complementary force-sending element form a driving force engaging mechanism for coupling the force-applying structure to the needle during operation. Before the needle reaches the target body cavity, the pressure in the needle causes the clutching device to assume an &ldquoengaged&rdquo state, coupling the driving force to the needle. When the needle reaches the body cavity, the change in pressure causes the clutching device to assume a &ldquodisengaged&rdquo state, disengaging the driving force from the needle, thereby, automatically positioning the needle in the cavity to avoid overshooting. Also provided are needle-and-syringe assemblies incorporating the disclosed clutching devices, methods for manufacturing the disclosed clutching devices, as well as methods for safely locating and positioning needles in the body cavity utilizing a needle-and-syringe assembly incorporating the disclosed clutching devices.
