Fluid dispensing device
First Claim
1. A fluid dispensing device adapted for engaging a fluid-filled syringe to dispense fluid from the syringe at a slow, steady rate, said syringe being of the type comprising an elongate housing including a tubular wall having an open end and an end wall having an outlet opening at the end of the tubular wall opposite its open end, and a plunger having one end portion positioned within and sealing against the inner surface of said tubular wall and an opposite end portion projecting from the open end of said tubular wall, with the fluid being within said tubular wall between said end wall and said plunger, said device comprising:
- a hose assembly having first and second ends and defining a passageway between said ends, with at least a portion of said passageway being defined by a capillary tube having a diameter of less than about 0.02 cm and a length of at least 2 cm, and including a coupler at said first end adapted for releasably attaching said hose assembly to the housing of a said syringe with the outlet opening of the syringe communicating with said passageway;
a frame comprising support means adapted for engaging and supporting said coupler;
spring means adapted for applying a uniform force against the plunger of the syringe to cause fluid within said syringe to flow through said hose assembly; and
activating means for moving said spring means between a disengaged position spaced from the plunger of a said syringe attached to said coupler to afford insertion or removal of the syringe and said hose assembly, and an engaged position engaged with said plunger to apply said uniform force, said activating means including securing means for securing the syringe and the coupler of said hose assembly in said support means when said activating means positions said spring means in said engaged position.
1 Assignment
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Accused Products
Abstract
A dispensing device including a hose assembly adapted to be coupled to a conventional syringe, which hose assembly includes a length of capillary tubing through which the fluid must pass as it is delivered; and means for applying a uniform force to the plunger to provide fluid flow through the capillary tube at a slow, steady rate over a long period of time.
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Citations
9 Claims
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1. A fluid dispensing device adapted for engaging a fluid-filled syringe to dispense fluid from the syringe at a slow, steady rate, said syringe being of the type comprising an elongate housing including a tubular wall having an open end and an end wall having an outlet opening at the end of the tubular wall opposite its open end, and a plunger having one end portion positioned within and sealing against the inner surface of said tubular wall and an opposite end portion projecting from the open end of said tubular wall, with the fluid being within said tubular wall between said end wall and said plunger, said device comprising:
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a hose assembly having first and second ends and defining a passageway between said ends, with at least a portion of said passageway being defined by a capillary tube having a diameter of less than about 0.02 cm and a length of at least 2 cm, and including a coupler at said first end adapted for releasably attaching said hose assembly to the housing of a said syringe with the outlet opening of the syringe communicating with said passageway; a frame comprising support means adapted for engaging and supporting said coupler; spring means adapted for applying a uniform force against the plunger of the syringe to cause fluid within said syringe to flow through said hose assembly; and activating means for moving said spring means between a disengaged position spaced from the plunger of a said syringe attached to said coupler to afford insertion or removal of the syringe and said hose assembly, and an engaged position engaged with said plunger to apply said uniform force, said activating means including securing means for securing the syringe and the coupler of said hose assembly in said support means when said activating means positions said spring means in said engaged position. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. A hose assembly having first and second ends and defining a through passageway between said ends, said hose assembly comprising a hose extending between said first and second ends, a coupler fixed to said hose at said first end adapted for releasably attaching said hose to the housing of a syringe with an outlet opening of the syringe communicating with said hose, a capillary tube having an inside diameter of less than about 0.02 centimeters and a length of at least 2 centimeters within said hose at said second end, and sealing means for preventing movement of fluid through said hose around said capillary tube.
Specification