Infusion pump retraction mechanism

A retraction mechanism for an infusion system having a chassis, a pumping mechanism assembly mounted to a pumping mechanism assembly support, and a flow path therethrough, to move the pumping mechanism assembly into an engaged position in engagement with the flow path and into a retracted position out of engagement with the flow path, said retraction mechanism comprising:

• a linearly movable assembly fixable to the pumping mechanism assembly support and linearly movable coupled to the chassis for linear movement in a first direction and an opposite direction, whereby the pumping mechanism assembly support is movable with said linearly movable assembly in said first direction into the engaged position and in said opposite direction into the retracted position;
• a toggle linkage comprising:
• a connecting link, a first toggle link, and a second toggle link, said connecting link and said first and second toggle links being rotatably coupled at first ends thereof to define a first rotation axis through said first ends of said connecting link, said first toggle link, and said second toggle link,
• an opposite end of said first toggle link being rotatably coupled to the chassis to define a second rotation axis, and
• an opposite end of said second toggle link being rotatably coupled to said linearly movable assembly to define a third rotation axis, whereby said third rotation axis is linearly movable in said first and opposite directions;
• and
• a retraction assembly linearly movably and rotatably coupled to the chassis for linear motion and rotation about a fourth axis parallel to said first and opposite directions, an opposite end of said connecting link being coupled to said retraction assembly at a point radially spaced from said fourth axis for movement radially about said fourth axis;
• whereby rotation of said retraction assembly provides translational motion of said connecting link, and the translation of said connecting link provides rotation of said first and second toggle links about said first, second, and third axes and linear motion of said third axis, and the linear motion of said third axis provides linear motion of said linearly movable assembly in said first and opposite directions.

A retraction mechanism for an infusion system having a pump mechanism and a pumping mechanism assembly support, comprising:

• a chassis;
• a pull rod assembly comprising:
• a pull rod brace fixed to said chassis, and
• a linearly movable assembly comprising a support arm having a slot therethrough, said support arm fixable to the pumping mechanism assembly support and coupled to said pull rod brace for linear movement in a direction, whereby the pumping mechanism assembly support is movable with said linearly movable assembly in said direction;
• a toggle linkage comprising:
• a connecting link, a first toggle link, and a second toggle link, said connecting link and said first and second toggle links being rotatably coupled at first ends thereof to define a first rotation axis,
• an opposite end of said first toggle link being rotatably coupled to said chassis to define a second rotation axis,
• an opposite end of said second toggle link being rotatably coupled to said linearly movable assembly to define a third rotation axis, whereby said third rotation axis is linearly movable in said direction, and
• said connecting link being disposed through said slot of said support arm;
• and
• a retraction assembly comprising:
• retraction brace fixed to said chassis,
• a retraction rod coupled to said retraction brace for linear motion and rotation about a fourth axis parallel to said direction, and
• a retraction link fixedly coupled to said retraction rod for rotation with said rod, an opposite end of said connecting link being coupled to said retraction link;
• whereby rotation of said retraction link provides translational motion of said connecting link, and the translation of said connecting link provides rotation of said first and second toggle links about said first, second, and third axes and linear motion of said third axis, and the linear motion of said third axis provides linear motion of said linearly movable assembly in said direction.

A retraction mechanism for an infusion system having a pump mechanism and a pumping mechanism assembly support, comprising:

• a chassis;
• a pull rod assembly comprising:
• a pull rod brace fixed to said chassis, and
• a linearly movable assembly fixable to the pumping mechanism assembly support and coupled to said pull rod brace for linear movement in a direction, whereby the pumping mechanism assembly support is movable with said linearly movable assembly in said direction;
• a toggle linkage comprising:
• a connecting link, a first toggle link, and a second toggle link, said connecting link and said first and second toggle links being rotatably coupled at first ends thereof to define a first rotation axis,
• an opposite end of said first toggle link being rotatably coupled to said chassis to define a second rotation axis, and
• an opposite end of said second toggle link being rotatably coupled to said linearly movable assembly to define a third rotation axis, whereby said third rotation axis is linearly movable in said direction;
• and a retraction assembly comprising:
• a retraction brace fixed to said chassis,
• a retraction rod coupled to said retraction brace for linear motion and rotation about a fourth axis parallel to said direction,
• a retraction link fixedly coupled to said retraction rod for rotation with said rod, an opposite end of said connecting link being coupled to said retraction link,
• an engaged position stop on said retraction brace and a corresponding engaged position stop on said retraction link positioned to abut said retraction brace engaged position stop in an engaged position to prevent rotation of said retraction rod about said fourth axis,
• a retracted position stop on said retraction brace, offset from said retraction brace engaged position stop, and a corresponding retracted position stop on said retraction link positioned to abut said retraction brace retracted position stop in a retracted position to prevent rotation of said retraction rod about said fourth axis, and
• a face adjacent and orthogonal to said retraction brace retracted position stop, and a corresponding surface on said retraction link positioned to abut said face in the retracted position to prevent linear motion of said retraction rod in said direction;
• whereby rotation of said retraction link provides translational motion of said connecting link, and the translation of said connecting link provides rotation of said first and second toggle links about said first, second, and third axes and linear motion of said third axis, and the linear motion of said third axis provides linear motion of said linearly movable assembly in said direction.