Patent ID: 9511186
Filing Date: 2016-12-06
CPC Classification: A61M,F04C

Claim Text:
1. A disposable pump cartridge for a medical injection system, the cartridge comprising: a shell including a first sidewall, a second sidewall opposite the first sidewall, a perimeter wall extending between the first and second sidewalls, a first opening extending through the first sidewall, a second opening extending through the second sidewall, a fill port, and an injection port, the ports being formed in the perimeter wall, and the shell being configured for the cartridge to be removably assemblable into a hull of the injection system such that the first opening, the second opening, the fill port, and the injection port each align with corresponding hull openings; a piston contained within the shell and including a first side, a second side opposite the first side, an outer perimeter edge extending from the first side to the second side, and an inner perimeter edge forming a bore of the piston that extends from the first side to the second side, the inner perimeter edge including a first portion and a second portion, the first portion being configured to engage with a fixed gear of the injection system, the first opening of the shell allowing insertion of the gear through the first opening of the shell and through the corresponding hull opening for the engagement, and the second portion being configured to engage with a drive member of the injection system, the second opening of the shell allowing insertion of the drive member through the second opening of the shell and through the corresponding hull opening for the engagement with the second portion of the piston inner perimeter edge; and a pressure seal including a first seal ring, a second seal ring, a first seal strip, and a second seal strip, the first seal ring extending about a perimeter of the first side of the piston, in proximity to the outer perimeter edge, the second seal ring extending about a perimeter of the second side of the piston, in proximity to the outer perimeter edge, the first seal strip extending from the first seal ring to the second seal ring along the outer perimeter edge, and the second seal strip extending from the first seal ring to the second seal ring along the outer perimeter edge and being generally opposite the first seal strip; wherein, when the disposable pump cartridge is assembled into the hull of the injection system, the fill port of the shell and a fill tubing line of the injection system are coupled together through the corresponding hull opening, and the injection port of the shell and an injection tubing line of the injection system are coupled together through the corresponding hull opening; wherein, when the fixed gear and the drive member of the injection system engage with the piston to move the piston within the shell, an expanding cavity and a contracting cavity are formed within the shell, the expanding cavity being in fluid communication with the fill port, and the contracting cavity being in fluid communication with the injection port; and the first seal ring is in sliding and sealing engagement with an inner surface of the first sidewall of the shell to seal the expanding and contracting cavities from one another and from the first opening of the shell, the second seal ring is in sliding and sealing engagement with an inner surface of the second sidewall of the shell to seal the expanding and contracting cavities from one another and from the second opening of the shell, and the first and second seal strips are in sliding and sealing engagement with an inner surface of the perimeter wall of the shell to seal the expanding and contracting cavities from one another.