Patent AU-2016200505-A1 (AU)
Title: Dispensing device with spring tongues for cement cartridges
Inventor: VOGT SEBASTIAN
IPC: A61F2/46
Filed: 2016-01-28
Abstract: DISPENSING DEVICE WITH SPRING TONGUES FOR CEMENT Dispensing device (1) for cement cartridges for polymethylmethacrylate bone cements comprising at least one manually actuatable operating element (4), an adapter (44) for a cement cartridge, and a clamping rod (2) that can be propelled in the direction of the adapter (44), whereby at least one propulsion body (24) is arranged to be touching against the clamping rod (2) and is shiftable in the dispensing device (1) in axial direction with respect to the axle of the clamping rod (2), whereby the at least one propulsion body (24) comprises multiple elastic spring tongues (50), whereby the spring tongues (50) each comprise a cutting edge (54), whereby the spring tongues (50) touch against the clamping rod (2) by means of the cutting edge (54), whereby the cutting edges (54) of the spring tongues (50) or the entire spring tongues (50) are harder than the clamping rod (2), and whereby the spring tongues (50) of the propulsion body (24) are inclined appropriately with respect to the clamping rod (2) such that, upon a motion of the propulsion body (24) in the propulsion direction of the clamping rod (2), the cutting edges (54) of the propulsion body (24) engage the clamping rod (2), and such that, upon a motion of the propulsion body (24) opposite to the propulsion direction of the clamping rod (2), the spring tongues (50) of the propulsion body (24) can be elastically deformed appropriately such that the cutting edges (54) slide over the clamping rod (2), whereby a spring element (40) pushes with an elastic force, at least for part of the time, onto the at least one propulsion body (24) opposite to the propulsion direction of the clamping rod (2), whereby a force can be exerted on the at least one propulsion body (24) in the propulsion direction of the clamping rod (2) by means of the operating element (4), whereby the propulsion body (24) and the clamping rod (2) can be propelled forward relative to the adapter (44) against the elastic force of the spring element (40) by means of said force, whereby a securing element (34), against which the propulsion body (24) is supported such as to be mobile, touches against the clamping rod (2), whereby the securing element (34) comprises multiple elastic spring tongues (52), whereby the spring tongues (52) each comprise a cutting edge (56), whereby the spring tongues (52) touch against the clamping rod (2) by means of the cutting edge (56), whereby at least the cutting edges (56) of the spring tongues (52) or the entire spring tongues (52) are harder than the clamping rod (2), and whereby the spring tongues (52) are inclined appropriately with respect to the clamping rod (2) such that, upon a motion of the clamping rod (2) opposite to the propulsion direction, the cutting edges (56) of the securing element (34) engage the clamping rod (2), and such that, upon a motion of the clamping rod (2) in the propulsion direction, the spring tongues (52) of the securing element (34) can be elastically deformed appropriately such that the cutting edges (56) slide over the clamping rod (2). 44 42 2 6 4028 26 24 2 8 46 1