NGAS powered self-resetting needle-less hypodermic jet injection apparatus and method
First Claim
1. A needle-less hypodermic jet injection device comprising:
- a hand piece assembly having a body for holding a drug injection cartridge with medication cylinder, injection nozzle, and drug-injection piston;
said hand piece assembly defining a first bore within said body for movably receiving a gas-power piston, a gas power piston movably received in said bore and having a ram portion extending into said drug injection cartridge to abut with said drug-injection piston, said body and gas-power piston cooperating to define a first variable-volume chamber in said first bore;
said body also defining an elongate second bore in gas communication with said first bore and separated therefrom by a center wall portion of said body, said body carrying a sealing member circumscribing said second bore and disposed along the length thereof so as to be sealingly engageable with a cylindrical gas capsule when said capsule is received into said second bore, said gas capsule having a penetrable wall section disposed toward said center wall, and said sealing member cooperating with said gas capsule to define a second variable-volume chamber in said second bore the volume of which varies in response to movement of said gas capsule in said body relative to said center wall;
said center wall carrying a penetrator means to penetrate said penetrable wall section of said gas capsule, and said hand piece assembly carrying a discharge mechanism including a trigger outwardly disposed on said body and a hammer movable in said body in response to actuation of said trigger to forcefully move said gas capsule in said second bore so as to impale said gas capsule at said penetrable wall section thereof upon said penetrator and to communicate pressurized gas to said first chamber;
whereby, said pressurized gas in said first chamber drives said gas-power piston to effect a hypodermic jet injection from said drug injection cartridge, and pressurized gas communicated from said gas capsule into said second chamber moves said gas capsule sealingly relative to said sealing member to push back said hammer and reset said trigger.
6 Assignments
0 Petitions
Accused Products
Abstract
A needle-less hypodermic jet injection device includes a hand-held injector, and a drug injection cartridge which provides a cylinder of liquid medication to be injected, an injection orifice, and an injection piston forceful movement of which in the cylinder causes an injection jet of medication to be expelled from the orifice. The injection device also includes a gas pressure capsule which powers the jet injection and which also automatically resets the injection device during an injection in order to prepare it for a subsequent injection. A multi-function component of the device is effective to place it in a safe condition allowing the device to be prepared for a next injection, and to place the device in a ready condition for allowing a jet injection to be conducted by use of the device.
215 Citations
19 Claims
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1. A needle-less hypodermic jet injection device comprising:
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a hand piece assembly having a body for holding a drug injection cartridge with medication cylinder, injection nozzle, and drug-injection piston;
said hand piece assembly defining a first bore within said body for movably receiving a gas-power piston, a gas power piston movably received in said bore and having a ram portion extending into said drug injection cartridge to abut with said drug-injection piston, said body and gas-power piston cooperating to define a first variable-volume chamber in said first bore;said body also defining an elongate second bore in gas communication with said first bore and separated therefrom by a center wall portion of said body, said body carrying a sealing member circumscribing said second bore and disposed along the length thereof so as to be sealingly engageable with a cylindrical gas capsule when said capsule is received into said second bore, said gas capsule having a penetrable wall section disposed toward said center wall, and said sealing member cooperating with said gas capsule to define a second variable-volume chamber in said second bore the volume of which varies in response to movement of said gas capsule in said body relative to said center wall; said center wall carrying a penetrator means to penetrate said penetrable wall section of said gas capsule, and said hand piece assembly carrying a discharge mechanism including a trigger outwardly disposed on said body and a hammer movable in said body in response to actuation of said trigger to forcefully move said gas capsule in said second bore so as to impale said gas capsule at said penetrable wall section thereof upon said penetrator and to communicate pressurized gas to said first chamber; whereby, said pressurized gas in said first chamber drives said gas-power piston to effect a hypodermic jet injection from said drug injection cartridge, and pressurized gas communicated from said gas capsule into said second chamber moves said gas capsule sealingly relative to said sealing member to push back said hammer and reset said trigger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A needle-less hypodermic jet injection device for use with a drug injection cartridge having a cylinder for receiving liquid medication, an orifice for forming the liquid into a high-velocity hypodermic injection jet, and an injection piston sealingly movable in said cylinder to displace said liquid medication via said orifice;
- said needle-less injection device comprising;
an injector hand piece including an injection piston ram defining an end abutment surface for abutting with an opposing end surface of said injection piston of said drug cartridge, said injection ram piston in response to communication of pressurized gas thereto forcefully driving the injection piston to form an injection jet of liquid medication held in said cylinder of said drug cartridge; said injection device including a body defining a pair of bores one of which sealingly and movably receives said injection ram piston, and the other of which sealingly and movably receives a pressurized gas capsule, a penetrator confronting a penetrable wall section of said pressurized gas capsule, and a hammer movable in said body to impale said pressurized gas capsule upon said penetrator, a resilient member for driving said hammer to a position impaling said pressurized gas capsule upon said penetrator, and a trigger device for releasing said hammer to be moved by said resilient member; said body cooperating with said pressurized gas capsule to define a chamber receiving pressurized gas from said capsule, and communication of pressurized gas from said capsule to said chamber moving said pressurized gas capsule to retract said hammer to store energy in said resilient member preparatory to a next subsequent release of said hammer member.
- said needle-less injection device comprising;
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17. A method of operating a needle-less hypodermic jet injection device using an injection cartridge having a cylinder for receiving liquid medication, an orifice for forming the liquid into a high-velocity hypodermic injection jet, and an injection piston movable sealingly in said cylinder to displace said liquid medication via said orifice;
- said method including steps of;
providing said device with a body defining a bore therein into which is sealingly and movably received a pressurized gas capsule; utilizing said body and said pressurized gas capsule to define a variable-volume chamber; and utilizing communication of pressurized gas from said pressurized gas capsule into said variable-volume chamber to move said pressurized gas capsule in order to movably prepare said jet injection device for a next successive injection. - View Dependent Claims (18, 19)
- said method including steps of;
Specification