Methods and apparatuses for joining a pumping cartridge to a pump drive
First Claim
1. A reusable pump drive system, the system comprising:
- a pump cartridge having a piston assembly and a cylinder assembly,the piston assembly comprising a connecting region and a body region, the connecting region of the piston assembly comprising a piston shaft, the body region of the piston assembly comprising a body having a side wall, a check valve,a fluid inlet extending from outside the cylinder assembly through the side wall of the body to the check valve for introducing a fluid into the pump cartridge,a piston having a sealing flange, andan annular groove in an outer surface of the cylinder assembly,a drive shaft adapter having an inner radial cavity to receive a portion of the piston shaft, a first end portion, a second end portion and one or more piston shaft retaining components,a fixed guide member having an inner radial passage extending therethrough, anda pump cartridge cylinder retaining component having a distal engagement pin with an inner end sized and positionable to engage the annular groove on the cylinder assembly,wherein in a first position the pump cartridge cylinder retaining component retains the cylinder assembly in the inner radial passage and in a second position the pump cartridge cylinder retaining component allows insertion of the cylinder assembly into the inner radial passage or removal of the cylinder assembly from the inner radial passage.
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Accused Products
Abstract
Embodiments are described for engaging a pumping cartridge with a pump drive. In certain embodiments, the cartridge, including a cylinder and a movable piston assembly, is initially assembled or subsequently positioned so that the distance between the attachment point on the piston assembly for coupling to a drive assembly, and a reference point on the cylinder, is greater than the maximal distance that will be encountered during normal oscillation of the piston during use. The cartridge, in certain embodiments, may be pressed into a drive assembly that immobilizes the cartridge and couples the piston assembly to the driveshaft. In certain embodiments, when the cartridge is fully inserted into the drive assembly, the piston is pressed into the cylinder sufficiently to establish a selected distance so that the piston shaft is in the proper position to engage with a coupling mechanism carried on the driveshaft.
260 Citations
18 Claims
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1. A reusable pump drive system, the system comprising:
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a pump cartridge having a piston assembly and a cylinder assembly, the piston assembly comprising a connecting region and a body region, the connecting region of the piston assembly comprising a piston shaft, the body region of the piston assembly comprising a body having a side wall, a check valve, a fluid inlet extending from outside the cylinder assembly through the side wall of the body to the check valve for introducing a fluid into the pump cartridge, a piston having a sealing flange, and an annular groove in an outer surface of the cylinder assembly, a drive shaft adapter having an inner radial cavity to receive a portion of the piston shaft, a first end portion, a second end portion and one or more piston shaft retaining components, a fixed guide member having an inner radial passage extending therethrough, and a pump cartridge cylinder retaining component having a distal engagement pin with an inner end sized and positionable to engage the annular groove on the cylinder assembly, wherein in a first position the pump cartridge cylinder retaining component retains the cylinder assembly in the inner radial passage and in a second position the pump cartridge cylinder retaining component allows insertion of the cylinder assembly into the inner radial passage or removal of the cylinder assembly from the inner radial passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A reusable pump drive system, the system comprising:
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a pump cartridge having a piston assembly and a cylinder assembly, the piston assembly comprising a connecting region and a body region, the connecting region of the piston assembly comprising a piston shaft, the body region of the piston assembly comprising a body having a side wall, a check valve, a fluid inlet extending from outside the cylinder assembly through the side wall of the body to the check valve for introducing a fluid into the pump cartridge, a piston having a sealing flange, and an annular groove in an outer surface of the cylinder assembly, a drive shaft adapter having an inner radial cavity to receive a portion of the piston shaft, a first end portion, a second end portion and one or more piston shaft retaining components, a fixed guide member having an inner radial passage extending therethrough, and a pump cartridge cylinder retaining component with an inner end sized and positionable to engage the annular groove on the cylinder assembly, wherein in a first position the pump cartridge cylinder retaining component retains the cylinder assembly in the inner radial passage and in a second position the pump cartridge cylinder retaining component allows insertion of the cylinder assembly into the inner radial passage or removal of the cylinder assembly from the inner radial passage, the pump cartridge cylinder retaining component axially reciprocates along its longitudinal axis between the first position and the second position.
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Specification