Patent ID: 6755563
Filing Date: 2004-06-29
Classification: A61B,A61F,B01F,B05C

Abstract:
Preparation and application device (20) for materials which are to be prepared immediately before use as a paste-like, flowable mass from at least one powder or granulate component and one liquid component, especially bone cement, with an elongated mixing cylinder (22) for receiving the components to be mixed, comprising in one end region a sealable through-opening (26) that can optionally be provided with a discharge unit for the paste-like material to be prepared, and a piston (30) which can be inserted into the other, opposite, open end, which piston is displaceable in the cylinder (22) and seals against the inner wall of the cylinder, the piston being penetrated by an elongated mixing shaft (34) sealed against the piston (30), with a mixing mechanism (36) disposed at the cylinder inside-end of the mixing shaft and a handle (38) disposed at the cylinder outside-end of the mixing shaft, wherein the open end of the cylinder (22) located opposite the through-opening (26) and receiving the piston (30) is additionally provided with a removable sealing cap (32) that can be attached to and removed from the cylinder or piston and has a through-opening (72) for the mixing shaft (34), wherein the piston (30) on the side of the sealing cap has a vacuum fitting (48) adapted for connection to a vacuum source, which vacuum source can produce a vacuum in the interior of the cylinder through a passageway provided in the piston, wherein the sealing cap includes a through-opening (74) through which through-opening the vacuum line connected to the vacuum source can be connected to the vacuum fitting in the piston (30), characterized in thatthe sealing cap (32), which can be placed over the edge of the open end of the cylinder (22), is movably connected to two elongated locking element 78 having flat sides located in a plane which are pre-mounted in a corresponding through-opening (84) of the piston (30), with the through-opening penetrating the piston (30) perpendicular to its longitudinal center axis and being complementary to the cross-section of the locking brackets (78), that in an edge region of the open end of the cylinder (22) there are provided open-ended recesses (86) with a narrowed mouth for receiving the locking brackets (78), and that in the intended locking position of the piston (30) the locking brackets (78) can be elastically pressed together in the transverse direction in the region located at the open end of the cylinder (22) and thereby be inserted in the cylinder (22) through the narrowed mouth of the recesses (86) disposed in the cylinder (22) and openings (84) provided in the piston (30), so as to hold the sealing caps (32) and the cylinder (22) on or in the open end region of the cylinder (22).