Patent ID: 11969582
Assignee: BAYER AKTIENGESELLSCHAFT
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 13:
14. A fluid injection system comprising:
a powered fluid injector head comprising at least one piston; and
at least one syringe engaged with the at least one piston of the powered fluid injector head,
wherein the syringe comprises:
a barrel defining an inner wall; and
a plunger located within the inner wall of the barrel, the plunger comprising:
a support ring comprising a first conical cap;
a cover disposed over and coupled to the support ring, wherein the cover comprises a second conical cap and a cylindrical side wall sidewall, wherein the cylindrical sidewall comprises at least one annular rib; and
an air cavity defined between the first conical cap and the second conical cap, the air cavity defining a predetermined compliance volume such that when the plunger undergoes injection pressurization, the cover deforms and flexes into the compliance volume,

wherein a distal portion of the first conical cap forms an angle with a proximal portion of the second conical cap, and
wherein, due to the deforming and flexing of the cover, the angle between the distal portion of the first conical cap and the proximal portion of the second conical cap is smaller when the plunger is under operating pressure than when the plunger is not under pressure, and wherein the at least one annular rib is radially outwardly deflected against the inner wall of the barrel when the angle is smaller.