Dosage device and method particularly useful for preparing liquid medications
First Claim
1. A dosage device for preparing a predetermined dosage of a liquid substance, comprising:
- a housing formed with a compartment;
a cylinder open at one end received in said compartment;
a piston movable within said cylinder and defining a dosage chamber with the opposite end of the cylinder for receiving a predetermined dosage of a liquid substance;
a dosage fixing assembly movable through said one end of the cylinder and defining a control chamber with respect to said piston; and
a fluid pressure source communicating with said control chamber between the piston and dosage fixing assembly, said fluid pressure source being controllable to increase the pressure in said control chamber to move the piston away from said dosage fixing assembly, and to decrease the pressure in said control chamber to move the piston towards and into contact with said dosage fixing assembly.
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Accused Products
Abstract
A dosage device for preparing a predetermined dosage of a liquid substance, particularly a liquid medication, includes: a housing format with a compartment; a cylinder open at one end and received in the compartment; a piston movable within the cylinder and defining a dosage chamber between one side of the piston and the second end of the cylinder for receiving a predetermined dosage of the liquid substance; a dosage fixing assembly movable through the one end of the cylinder and precisely controlled to fix the position of the dosage fixing assembly, and thereby the position of the piston when in contact with the dosage fixing assembly; the dosage fixing assembly when moving through the one end of the cylinder, closing the open end to define a control chamber with the other side of the piston; and a fluid pressure source communicating with the control chamber between the piston and dosage fixing assembly, the fluid pressure source being controllable to increase the pressure in the control chamber to move the piston away from the dosage fixing assembly, and to decrease the pressure in the control chamber to move the piston towards and into contact with the dosage fixing assembly. Also described is a method of preparing a predetermined dosage of a liquid medication substance utilizing the above-described dosage device.
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Citations
43 Claims
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1. A dosage device for preparing a predetermined dosage of a liquid substance, comprising:
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a housing formed with a compartment;
a cylinder open at one end received in said compartment;
a piston movable within said cylinder and defining a dosage chamber with the opposite end of the cylinder for receiving a predetermined dosage of a liquid substance;
a dosage fixing assembly movable through said one end of the cylinder and defining a control chamber with respect to said piston; and
a fluid pressure source communicating with said control chamber between the piston and dosage fixing assembly, said fluid pressure source being controllable to increase the pressure in said control chamber to move the piston away from said dosage fixing assembly, and to decrease the pressure in said control chamber to move the piston towards and into contact with said dosage fixing assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A dosage device for preparing predetermined dosages of a liquid medication, comprising:
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a housing having a compartment for receiving a removable cartridge unit including a cylinder open at one end and a piston movable therein, such that the piston defines with the opposite end of the cylinder a dosage chamber for receiving a liquid medication substance;
a dosage fixing assembly movable within said one end of the cylinder in sealed engagement to define a control chamber with said piston;
and a fluid pressure source communicating with said control chamber between said movable piston and said dosage fixing assembly, said fluid pressure source being controllable to increase the pressure in said control chamber to move the piston away from the dosage fixing assembly, and to decrease the pressure in said control chamber to move the piston towards and against said dosage fixing assembly, and thereby to precisely fix the volume of said dosage chamber. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A dosage device for preparing a predetermined dosage of a liquid substance, comprising:
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a housing format with a compartment;
a cylinder open at one end and received in said compartment;
a piston movable within said cylinder and defining a dosage chamber between one side of the piston and the opposite end of the cylinder for receiving a predetermined dosage of a liquid substance;
a plunger stem movable through said one end of the cylinder and precisely controlled to fix the position of the plunger stem, and thereby the position of the piston when in contact with the plunger stem;
said plunger stem when moving through said one end of the cylinder, closing said open end to define a control chamber with the other side of said piston;
and a fluid pressure source communicating with said control chamber between the piston and plunger stem, said fluid pressure source being controllable to increase the pressure in said control chamber to move the piston away from said plunger stem, and to decrease the pressure in said control chamber to move the piston towards and into contact with said plunger stem. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34)
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29. A dosage device for preparing predetermined dosages of a liquid medication, comprising:
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a housing having a compartment for receiving a removable cartridge unit including a cylinder open at one end and a piston movable therein, such that the piston defines with the opposite end of the cylinder a dosage chamber for receiving the liquid medication substance;
a dosage fixing assembly movable through said one end of the cylinder and precisely controlled to fix the position of the dosage fixing assembly, and thereby the position of said piston when in contact with the dosage fixing assembly;
said dosage fixing assembly when moving through said one end of the cylinder, closing said open end to define a control chamber with the other side of said piston;
and a fluid pressure source communicating with said control chamber between the piston and dosage fixing assembly, said fluid pressure source being controllable to increase the pressure in said control chamber to move the piston away from said dosage fixing assembly, and to decrease the pressure in said control chamber to move the piston towards and into contact with said dosage fixing assembly;
said dosage fixing assembly including a fluid passageway therethrough for communicating said fluid pressure source with said control chamber between said piston and dosage fixing assembly.
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35. A method of preparing a predetermined dosage of a liquid medication, comprising:
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vertically coupling to a device including a plunger stem, a cylinder having a piston defining a dosage chamber with an upper end of said cylinder;
elevating said plunger stem by a motor included in said device, to enter in sealed engagement through a wide opening of a lower end of said cylinder to define a control chamber inside said cylinder between said plunger stem and said piston;
further moving said plunger stem inside said cylinder towards said piston while decreasing the volume of said control chamber and expelling the air from said control chamber to the atmosphere through a passageway included within said plunger stem until said plunger stem engages and further moves said piston along said cylinder to a predetermined location defining a measured volume of said dosage chamber;
coupling a supply container with a medication substance into said device while forming a pathway between said supply container and said dosage chamber inside said cylinder;
connecting said control chamber to a pressure source contained in said device through said passageway in said plunger stem;
increasing the pressure inside said control chamber by said pressure source to drive said piston away from said plunger stem until said piston is stopped at said upper end of said cylinder, while transferring a fluid contents of said measured volume of said dosage chamber into said supply container with said medication substance;
and decreasing the pressure inside said control chamber by said pressure source to move said piston towards and into contact with said plunger stem, thereby drawing a dosage of a liquid medication substance wherein the volume of the dosage is defined by said predetermined location of said plunger stem. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
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Specification