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AssigneeHer Majesty the Queen in right of Canada, as represented by the National Research Council
InventorGavin McGregor
Estimating the term…
An apparatus for injecting liquids into a body without using hypodermic needles, the liquid being ejected from a small orifice in a probe at a velocity which will penetrate the surface of a body against which the probe is placed. The apparatus ejects a specific small volume of the liquid under a very high initial velocity and pressure followed by the ejection of the main charge of liquid at a lower velocity so that the liquid flows into the channel caused by the initial penetration without penetrating to a greater depth. The probe is connected to a hand-held portion whose other end is attached via a flexible tube containing a suitable hydraulic fluid to two remote pressure intensifiers, one of which creates the required high initial pressure for a short period of time and the other of which provides the pressure necessary to eject the main charge of liquid at a lower velocity. The second intensifier is synchronized electronically or mechanically to follow the initial pulse when its pressure decays to the main charge injection pressure. The pressures created by the high pressure intensifier and second pressure intensifier are individually adjustable for various type of situations, such as depth of penetration or skin conditions.
An apparatus for injecting liquid into a body through a penetrable skin thereof, comprising a slim hand-held portion having a restricted orifice in a tip at its free end and its other end connected to a high pressure flexible tube containing hydraulic fluid, said flexible tubing being connected to remote pressure intensifier means, said hand-held portion comprising a first cylinder within said hand-held portion communicating with said orifice, a first piston movable in said first cylinder, movement of the first piston towards said orifice ejecting any liquid placed in the first cylinder out through the orifice, a second cylinder in said hand-held portion co-axial with said first cylinder, a second piston movable in said second cylinder and connected to said first piston, the second piston being spring-biased towards said other end and communicating with the hydraulic fluid in said flexible tube;
Dependencies are inferred from the claim text.