MINIATURE DISPOSABLE OR PARTIALLY REUSABLE DOSING PUMP
First Claim
1. A dosing pump that can be worn on the body of a patient for subcutaneously delivering liquid with centi-micro liter accuracy to the body of said patient, said dosing pump comprising:
- A. a pump unit comprising;
i) a pump block comprising;
a.) a pump chamber with a pump diaphragm stretched across its entrance;
b.) a pump pin cylinder extending from the exterior of said pump block to said entrance to said pump chamber;
c.) an inlet chamber with an inlet diaphragm stretched across its entrance;
d.) an outlet chamber with an outlet diaphragm stretched across its entrance; and
e.) several channels to provide fluid communication between said pump, inlet, and outlet chambers and the outside of said pump block;
ii) a pump pin comprising a rounded distal end that is located in said pump pin cylinder;
iii) a motor unit comprising;
a.) a motor; and
b.) a gear system comprising a plurality of gears arranged to transfer the rotary motion of the shaft of said motor to an output axle coupled to said pump pin;
B. an internal control unit; and
C. a reservoir containing said liquid;
wherein, when said motor is activated, the rotational motion of said motor and the gears in said gear system is transformed into cyclic back and forth linear motion of said pump pin in said pin cylinder;
wherein, as said pump pin is pushed forward, its rounded distal end pushes against said pump diaphragm causing said pump diaphragm to stretch and move forward, reducing the volume of said pump chamber, increasing the pressure on liquid located in said pump chamber causing said outlet diaphragm to stretch into said outlet chamber, thereby allowing said liquid to flow out of said pump block through said outlet chamber; and
, when said pump pin is pulled backward, the internal forces created in said pump diaphragm by stretching it will act to return said pump diaphragm to its minimum energy position, thereby increasing the volume of said pump chamber, reducing the pressure in said pump chamber below atmospheric pressure causing said inlet diaphragm to stretch into said inlet chamber, thereby allowing said liquid to be sucked out of said reservoir via said inlet chamber into said pump chamber.
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Accused Products
Abstract
The invention is a dosing pump that can be worn on the body of a patient for subcutaneously delivering liquid with centi-micro liter accuracy to his/her body. The dosing pump comprises a pump unit, an internal control unit; and a reservoir containing the liquid. The pump unit comprises a pump block (12) comprising a pump chamber (118) with a pump diaphragm (107) stretched across its entrance and a pump pin cylinder (110) extending from the exterior of the pump block to the entrance to the pump chamber; a pump pin (20) that is located in the pump pin cylinder and a motor unit comprising a motor and gear system. When the motor is activated, the rotational motion of the motor and the gears in the gear system is transformed into cyclic back and forth linear motion of the pump pin in the pin cylinder pumping the liquid from the reservoir into the patient. Unlike standard piston pumps, the pump diaphragm is not attached to the pump pin and the only force required to be exerted by the motor is to move the pin back and forth and not to pull the diaphragm back, i.e. in the present invention the force required to create the suction is provided by the internal energy stored in the stretched diaphragm and not by the mechanism that moves the piston.
23 Citations
27 Claims
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1. A dosing pump that can be worn on the body of a patient for subcutaneously delivering liquid with centi-micro liter accuracy to the body of said patient, said dosing pump comprising:
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A. a pump unit comprising; i) a pump block comprising; a.) a pump chamber with a pump diaphragm stretched across its entrance; b.) a pump pin cylinder extending from the exterior of said pump block to said entrance to said pump chamber; c.) an inlet chamber with an inlet diaphragm stretched across its entrance; d.) an outlet chamber with an outlet diaphragm stretched across its entrance; and e.) several channels to provide fluid communication between said pump, inlet, and outlet chambers and the outside of said pump block; ii) a pump pin comprising a rounded distal end that is located in said pump pin cylinder; iii) a motor unit comprising; a.) a motor; and b.) a gear system comprising a plurality of gears arranged to transfer the rotary motion of the shaft of said motor to an output axle coupled to said pump pin; B. an internal control unit; and C. a reservoir containing said liquid; wherein, when said motor is activated, the rotational motion of said motor and the gears in said gear system is transformed into cyclic back and forth linear motion of said pump pin in said pin cylinder;
wherein, as said pump pin is pushed forward, its rounded distal end pushes against said pump diaphragm causing said pump diaphragm to stretch and move forward, reducing the volume of said pump chamber, increasing the pressure on liquid located in said pump chamber causing said outlet diaphragm to stretch into said outlet chamber, thereby allowing said liquid to flow out of said pump block through said outlet chamber; and
, when said pump pin is pulled backward, the internal forces created in said pump diaphragm by stretching it will act to return said pump diaphragm to its minimum energy position, thereby increasing the volume of said pump chamber, reducing the pressure in said pump chamber below atmospheric pressure causing said inlet diaphragm to stretch into said inlet chamber, thereby allowing said liquid to be sucked out of said reservoir via said inlet chamber into said pump chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification