System and method for a constant force syringe pump accomodating syringes of different sizes

A constant force syringe pump assembly accommodating syringes of different sizes comprising:

• an expandable base having a proximal end and a distal end, the base comprising:
• a first base section and a second base section, wherein the first base section is in sliding engagement with the second base section such that the first base section and the second base section are slidably movable relative to each other between a compacted position and an expanded position, wherein the base in the expanded position is adapted to seat a syringe having a plunger slidably disposed within a chamber having an outlet, the chamber having a length and a diameter, the plunger having a head;
• a pusher in sliding engagement with the base, wherein the pusher is dimensioned to contact the head of the plunger;
• a puller in sliding engagement with the base;
• a sizer structured and arranged to determine the size of the chamber;
• an adjustable driver structured and arranged to provide a constant force between the pusher and the puller, the constant force adjustably selected by the size of the chamber;
• whereby slidably moving the puller distally when the syringe is seated in the base causes the pusher to contact and exert a substantially constant force specific for the size of the chamber on the head of the plunger, the constant force sufficient to move the plunger of the syringe;
• and
• an expandable cover pivotally connected to the proximal end of the base, a linkage pivotally coupled between the cover and the puller and structured and arranged to translate the opening of the cover to the movement of the puller and pusher towards the proximal end, and the closing of the cover when the syringe has been disposed engages the pusher against the plunger and moves the puller towards the distal end and engages the adjustable driver.

A constant force syringe pump assembly accommodating syringes of different sizes comprising:

• a base having a proximal end and a distal end, the base structured and arranged to receive a syringe having a plunger slidably disposed within a chamber having an outlet, the chamber having a length and a diameter, the plunger having a head;
• a pusher in sliding engagement with the base, the pusher structured and arranged to contact the head of the plunger;
• a puller in sliding engagement with the base;
• a sizer structured and arranged to determine the size of the chamber;
• a plurality of different springs, each spring having a first end and a second end, the first end of each spring connected to the pusher, the second end of each spring selectively attached to the puller, the selection of at least one selectively attached spring from the plurality of springs based on the size of the chamber;
• whereby slidably moving the puller distally when the syringe is seated in the base causes the pusher to contact and exert a substantially constant force specific for the size of the chamber on the head of the plunger, the constant force sufficient to move the plunger of the syringe;
• and
• a cover pivotally connected to the proximal end of the base, a linkage pivotally coupled between the cover and the puller and structured and arranged to translate the opening of the cover to the movement of the puller and pusher towards the proximal end, and the closing of the cover when the syringe has been disposed engages the pusher against the plunger and moves the puller towards the distal end and tensions the at least one selectively attached spring;
• wherein the base and cover enclose the chamber body, the at least one selectively attached spring, puller and pusher are structured and arranged to provide the constant force specific to the size of the chamber to the plunger of the syringe providing a pressure pump.

A method for using a constant force syringe pump enclosure assembly accommodating syringes of different sizes to dispense a solution from a syringe, comprising:

• providing a pump enclosure comprising:
• a base having a proximal end and a distal end, the base structured and arranged to receive a syringe having a plunger slidably disposed within a chamber having an outlet, the chamber having a length and a diameter, the plunger having a head;
• a pusher in sliding engagement with the base, the pusher structured and arranged to contact the head of the plunger;
• a puller in sliding engagement with the base, the puller structured and arranged to receive a syringe having a plunger set to extrude a liquid from a chamber, the chamber having a length and a diameter;
• a sizer structured and arranged to determine the size of the chamber;
• an adjustable driver structured and arranged to provide a constant force between the pusher and the puller, the constant force adjustably selected by the size of the chamber;
• whereby slidably moving the puller distally when the syringe is seated in the base causes the pusher to contact and exert a substantially constant force specific for the size of the chamber on the head of the plunger, the constant force sufficient to move the plunger of the syringe;
• and
• an expandable cover connected to the proximal end of the base, a linkage coupled between the cover and the puller and structured and arranged to translate the opening of the cover to the movement of the puller and pusher towards the proximal end, and the closing of the cover when the syringe has been disposed engages the pusher against the plunger and moves the puller towards the distal end and engages the adjustable driver;
• wherein the expandable base and expandable cover enclose the chamber body, the adjustable driver, puller and pusher are structured and arranged to provide force specific to the length of the chamber to the plunger of the syringe providing a pressure pump;
• opening the expandable cover of the pump enclosure;
• seating a selected syringe within the expandable base, the sizer determining a size of the selected syringe, the determined size selectively engaging adjustable driver;
• and
• closing the expandable cover to engage the pusher against the plunger of the selected syringe.

A method for using a constant force syringe pump enclosure assembly accommodating syringes of different sizes to dispense a solution from a syringe, comprising:

• providing a pump enclosure comprising:
• a base having a proximal end and a distal end, the base structured and arranged to receive a syringe having a plunger slidably disposed within a chamber having an outlet, the chamber having a length and a diameter, the plunger having a head;
• a pusher in sliding engagement with the base, the pusher structured and arranged to contact the head of the plunger;
• a puller in sliding engagement with the base, the puller structured and arranged to receive a syringe having a plunger set to extrude a liquid from a chamber, the chamber having a length and a diameter;
• a sizer structured and arranged to determine the size of the chamber;
• a plurality of different springs, each spring having a first end and a second end, the first end of each spring connected to the pusher, the second end of each spring selectively attached to the puller, the selection of at least one selectively attached spring from the plurality of springs based on the length of the chamber;
• whereby slidably moving the puller distally when the syringe is seated in the base causes the pusher to contact and exert a substantially constant force specific for the size of the chamber on the head of the plunger, the constant force sufficient to move the plunger of the syringe;
• and
• an expandable cover pivotally connected to the proximal end of the base, a linkage pivotally coupled between the cover and the puller and structured and arranged to translate the opening of the cover to the movement of the puller and pusher towards the proximal end, and the closing of the cover when the syringe has been disposed engages the pusher against the plunger and moves the puller towards the distal end and tensions the at least one selectively attached spring;
• wherein the expandable base and expandable cover enclose the chamber body, the at least one selectively attached spring, puller and pusher are structured and arranged to provide force specific to the length of the chamber to the plunger of the syringe providing a pressure pump;
• opening the expandable cover of the pump enclosure;
• seating a selected syringe within the expandable base, the sizer determining a size of the selected syringe, the determined size selectively engaging at least one spring from the plurality of springs;
• and
• closing the expandable cover to engage the pusher against the plunger of the selected syringe.