Syringe actuation system
First Claim
1. A portable syringe filling apparatus for drawing and dispensing controlled or variable amounts of liquid, comprising:
- (a) a double acting cylinder, having a body, and a rod slidably disposed within the body;
(b) a front bulkhead, fixed to the front of the body of the double acting cylinder, having a curved channel for gripping the barrel portion of a hypodermic syringe;
(c) a rear bulkhead, fixed to the rear end of the body of the double acting cylinder, having a curved channel for gripping the barrel portion of a hypodermic syringe, with a flange slot;
(d) a slider, attached to the double acting cylinder rod end, having a sufficient internal diameter that allows the slider to move over the body of the double acting cylinder;
(e) a thumb plate gripper, fixed to the slider, and having a groove for receiving a syringe thumb plate;
(f) a valve assembly, having an actuating switch lever, so that when moved it is able to actuate one of two three way valves;
(g) a draw line, connected to a three way valve in the valve assembly and to a first port on the double acting cylinder body;
(h) a dispense line, connected to a three way valve in the valve assembly and to a second port on the double acting cylinder body.
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Accused Products
Abstract
A portable and hand held syringe filling device, having a frame that forms a curved channel, and one or more bulkheads fixed to the frame, that grip the barrel and flanges of a hypodermic syringe. A double acting air cylinder is fixed to one of the bulkheads, and is positioned within the frame channel, with the moving rod portion fixed to a slider having a thumb plate gripper that grips the thumb plate and plunger of a hypodermic syringe. The amount of air pressure and flow rate of the air pressure is specifically tailored to actuate the double action air cylinder, to provide an exact draw and dispense force on the syringe plunger. An adjustable stop is used to allow the syringe filling device to act as a pump, that delivers metered portions of liquid to target containers.
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Citations
13 Claims
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1. A portable syringe filling apparatus for drawing and dispensing controlled or variable amounts of liquid, comprising:
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(a) a double acting cylinder, having a body, and a rod slidably disposed within the body; (b) a front bulkhead, fixed to the front of the body of the double acting cylinder, having a curved channel for gripping the barrel portion of a hypodermic syringe; (c) a rear bulkhead, fixed to the rear end of the body of the double acting cylinder, having a curved channel for gripping the barrel portion of a hypodermic syringe, with a flange slot; (d) a slider, attached to the double acting cylinder rod end, having a sufficient internal diameter that allows the slider to move over the body of the double acting cylinder; (e) a thumb plate gripper, fixed to the slider, and having a groove for receiving a syringe thumb plate; (f) a valve assembly, having an actuating switch lever, so that when moved it is able to actuate one of two three way valves; (g) a draw line, connected to a three way valve in the valve assembly and to a first port on the double acting cylinder body; (h) a dispense line, connected to a three way valve in the valve assembly and to a second port on the double acting cylinder body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of drawing and dispensing controlled or variable amounts of liquid, to avoid cavitation, comprising the steps of:
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(a) fitting a syringe, that is fitted to a source liquid, onto a syringe filling apparatus, by pushing the syringe barrel into the curved channels of the front and rear bulkheads, and positioning the thumb plate into the thumb plate gripper on an apparatus comprising a double acting cylinder, having a body, and a rod slidably disposed within the body;
a front bulkhead, fixed to the front of the body of the double acting cylinder, having a curved channel for gripping the barrel portion of a hypodermic syringe;
a rear bulkhead, fixed to the rear end of the body of the double acting cylinder, having a curved channel for gripping the barrel portion of a hypodermic syringe, with a flange slot;
a slider, attached to the double acting cylinder rod end, having a sufficient internal diameter that allows the slider to move over the body of the double acting cylinder;
a thumb plate gripper, fixed to the slider, and having a groove for receiving a syringe thumb plate gripper;
a valve assembly, having an actuating switch lever, so that when moved it is able to actuate one of two three way valves;
a draw line, connected to a three way valve in the valve assembly and to a first port on the double acting cylinder body;
a dispense line, connected to a three way valve in the valve assembly and to a second port on the double acting cylinder body;(b) setting pressure in the draw line so that it is lower than the pressure in the dispense line; (c) moving the actuating switch lever from an original position to an aft position, so that pressure from the draw line urges the double acting cylinder rod outward from the body, which moves the syringe plunger backwards, so that fluid can move into the syringe barrel; (d) allowing desired amount of fluid to enter the syringe; (e) moving the actuating switch lever back to the original position, and allowing pressure in the double acting cylinder to vent; (f) moving the actuating switch lever to a forward position, so that pressure from the dispense line urges the double acting cylinder rod back into the body, pushing the plunger forward in the syringe barrel to dispense fluid; (g) moving the actuating switch lever back to the original position, once the desired amount of fluid has been dispensed, causing all pressure in the double acting cylinder to vent.
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Specification