Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including internal mixing or stirring means
Patent
1991-10-30
1993-10-12
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Including internal mixing or stirring means
422224, 366242, 366255, 366256, 366267, 366269, A61B 1756, A61L 2500, A61F 246
Patent
active
052523012
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder in the form of a tube with a bottom and a lid and inside the mixing cylinder an axially movable agitator in the form of a piston-like agitator disc, which is perforated by channels, through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod resembling a piston rod operatively connected to the agitator disc and supported in the lid in such a way that it is free to slide.
Bone cement is used in hip-joint operations, for example. When manufacturing bone cement, for which purpose a component in the form of a powder and a liquid component require to be mixed, it is important that the mixture should be as homogeneous as possible, and that gases which occur during the mixing procedure are removed to the greatest extent possible. Any lack of homogeneity and gas inclusions have the effect of reducing the strength of the bone cement, which can result in a shorter service life for the implanted prosthesis. Furthermore, the gases which occur during manufacture are unhealthy, for which reason steps must be taken to ensure that they do not escape into the operating theatre.
The object of the present invention is to make available a preparation apparatus for bone cement, which is intended to be disposable and capable of being manufactured efficiently and at a low cost, and which also contributes to meeting the requirements stipulated above in respect of the prepared bone cement.
This object is met in that the agitator rod exhibits an axial channel, which is closed off at the agitator disc, and in that the bottom is so arranged, under the effect of an axial force, as to be displaced like a piston axially in the direction of the lid, in conjunction with which the bone cement flows out through the channel after it has been opened.
BRIEF DESCRIPTION OF THE DRAWINGS
Additional advantages of the invention can be appreciated from the accompanying dependent claims and from the following description with reference to the accompanying drawing, in which
FIGS. 1a and 1b illustrate schematically in longitudinal section a mixing cylinder with a bottom and an agitator supported in a lid in such a way that it is free to slide, in accordance with a first embodiment of the preparation arrangement in accordance with the invention.
FIG. 1c illustrates an agitator disc in accordance with the invention viewed from below.
FIG. 2 is a longitudinal section through an arrangement in accordance with the aforementioned first embodiment, and
FIG. 3 illustrates in detail the penetration of a sealing membrane.
FIG. 4 illustrates how the aforementioned first embodiment of the preparation arrangement in accordance with the present invention is used as a bone cement syringe.
FIG. 5 is a longitudinal section through a second embodiment of the preparation arrangement in accordance with the invention.
DETAILED DESCRIPTION OF THE INVENTION
The designation 1 is used in the drawing for a mixing cylinder, and 2 for a bottom which is inserted in a sealing fashion into one end of the mixing cylinder 1. The mixing cylinder 1 is preferably made from a transparent material, and the bottom 2, which, for reasons which will become clear later, is made from a rubber-like elastic material, is formed with a projecting stud 2a facing towards the inside of the cylinder and has an annular flange-like projection 2b which engages in a corresponding groove 1a in the inner wall of the mixing cylinder 1.
The preparation arrangement in accordance with the invention also includes a lid 3 with an agitator 4 capable of axial movement therein. This comprises a piston-like agitator disc 4a and an agitator rod 4b supported in the lid 3 in such a way that it is free to slide. The lid is sealed against the inner wall of the mixing cylinder 1 and against the agitator rod 4b by means of `O`-rings 5 and 6. The lid 3 also exhibits an evacuation channel 3a, which, via a line 7,
REFERENCES:
patent: 2580316 (1951-12-01), Peebles et al.
patent: 4208133 (1980-06-01), Korte-Jungermann
patent: 4676406 (1987-06-01), Frischmann et al.
patent: 4799801 (1989-01-01), Bruning
patent: 4973168 (1990-11-01), Chan
International Search Report for International Application No. PCT/SE 90/00018.
Jonsson Soren
Nilson Thomas
Smeds Staffan
Thorling Jan
Cemvac System AB
Smith Stephanie
Warden Robert J.
LandOfFree
Apparatus for the preparation of bone cement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for the preparation of bone cement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for the preparation of bone cement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1902598