US4854716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for processing bone cement
Assignee: ALLO PRO AG A CORP OF SWITZERLAND
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Filing: 1988-05-09
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Granted: 1989-08-08
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Expires: 2008-05-09
Abstract
Abstract The device for processing bone cement includes a mixing station with a stirrer for mixing the components of the bone cement under vacuum. The device also includes a resting station in which the mixed ingredients may be stationed for a resting period, processing period and curing period. The temperature-dependent reaction time on the polarmarization reaction can be taken into account in determining the discrete time intervals by means of a temperature sensor for sensing ambient temperature. Acoustic and visual signal generating devices are also provided to indicate the end of each time intervals.
Inventors
- 👤 Edeltraud Ziemann
- 👤 Andreas Ziemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:38
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/48; B; B01; B01F; B01F35/00; B01F35/20; B01F35/22; B01F35/2201; B01F35/2209; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61B17/8833; A61B17/8836; A61B2017/883; A61F2/30; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30289; A61F2/46; A61F2002/4685; A61F2002/4688; A61F2002/4696; A61F2230/00; A61F2230/0063; A61F2230/0091; B01F2101/00; B01F2101/20; B01F33/00; B01F33/50; B01F33/501; B01F33/5011
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
84 words
A device for processing bone cement comprising a mixing arrangement including a mixing container for receiving bone cement ingredients, a stirrer for mixing the ingredients, and a motor for driving said stirrer; a vacuum pump for selectively evacuating said container; and a control means connected to said motor and said pump for controlling mixing of the ingredients in said container, said means including a time counter for monitoring time intervals during mixing and signal means for indicating the end of each said time interval.
Claim 2
Independent Claim
84 words
A device for processing bone cement comprising a mixing arrangement including a mixing container for receiving bone cement ingredients, a stirrer for mixing the ingredients, and a motor for driving said stirrer; a vacuum pump for selectively evacuating said container; and a control means connected to said motor and said pump for controlling mixing of the ingredients in said container, said means including a time counter for monitoring time intervals during mixing and signal means for indicating the end of each said time interval.
Claim 3
Dependent Claim
41 words
A device as set forth in claim 1 which further comprises a temperature sensor for sensing ambient temperature connected to said control means for changing the duration of at least some of said time intervals as a function of sensed temperature.
Claim 4
Dependent Claim
28 words
A device as set forth in claim 2 wherein said control means includes means for adjusting said time intervals in dependence on the ingredients for the bone cement.
Claim 5
Dependent Claim
15 words
A device as set forth in claim 1 wherein said motor is adjustable in speed.
Claim 6
Dependent Claim
13 words
A device as set forth in claim 1 wherein said motor is reversible.
Claim 7
Dependent Claim
33 words
A device as set forth in claim 1 which further comprises a pressure sensor connected to said vacuum pump to maintain a constant pressure differential relative to ambient pressure during discrete time intervals.
Claim 8
Dependent Claim
28 words
A device as set forth in claim 1 wherein said stirrer is of corkscrew shape having an outer diameter slightly less than an inner diameter of said container.
Claim 9
Dependent Claim
36 words
A device as set forth in claim 7 wherein said stirrer has a horizontally disposed scoop of V-shape encompassing a longitudinal axis of said stirrer and a tearing hook extending from said scoop towards said axis.
Claim 10
Dependent Claim
21 words
A device as set forth in claim 8 wherein said hook is disposed in a vertical plane parallel to said axis.
Claim 11
Dependent Claim
24 words
A device as set forth in claim 8 wherein said hook defines an angle of 60° with a horizontal plane perpendicular to said axis.
Claim 12
Dependent Claim
19 words
A device as set forth in claim 8 wherein said hook terminates at a point spaced from said axis.
Claim 13
Dependent Claim
66 words
A device as set forth in claim 1 wherein said control means includes a temperature sensor for sensing ambient temperature connected to said control means for changing the duration of at least some of said time intervals as a function of sensed temperature and a pressure sensor connected to said vacuum pump to maintain a constant pressure differential relative to ambient pressure during discrete time intervals.
Claim 14
Dependent Claim
56 words
A mixing arrangement for bone cement including a container for receiving bone cement ingredients; and a rotatable stirrer for mixing the ingredients in said container, said stirrer having a corkscrew shape with a horizontally disposed scoop of V-shape encompassing a longitudinal axis of said stirrer and a tearing hook extending from said scoop towards said axis.
Claim 15
Dependent Claim
56 words
A mixing arrangement for bone cement including a container for receiving bone cement ingredients; and a rotatable stirrer for mixing the ingredients in said container, said stirrer having a corkscrew shape with a horizontally disposed scoop of V-shape encompassing a longitudinal axis of said stirrer and a tearing hook extending from said scoop towards said axis.
Claim 16
Dependent Claim
27 words
A mixing arrangement as set forth in claim 13 which further comprises a vacuum pump for selectively evacuating said container during mixing of the bone cement ingredients.
Claim 17
Dependent Claim
37 words
A stirrer for mixing bone cement having a corkscrew shape extending along a longitudinal axis, a V-shaped scoop at one end extending perpendicularly of said axis and a tearing hook extending from said scoop towards said axis.
Claim 18
Dependent Claim
37 words
A stirrer for mixing bone cement having a corkscrew shape extending along a longitudinal axis, a V-shaped scoop at one end extending perpendicularly of said axis and a tearing hook extending from said scoop towards said axis.
Claim 19
Dependent Claim
20 words
A stirrer as set forth in claim 15 wherein said hook is disposed in a plane parallel to said axis.
Claim 20
Dependent Claim
24 words
A stirrer as set forth in claim 15 wherein said hook defines an angle of 60° with a horizontal plane perpendicular to said axis.
Claim 21
Independent Claim
82 words
A device for mixing bone cement comprising a mixing station including a rotatable stirrer for receiving a container having mixable bone cement ingredients therein; a vacuum pump means connected to said mixing station for maintaining a predetermined negative pressure in the container during mixing of the bone cement ingredients; and a resting station for receiving the container after mixing, said resting station being in selective communication with said vacuum pump means for evacuation of the container during curing of the bone cement.
Claim 22
Independent Claim
82 words
A device for mixing bone cement comprising a mixing station including a rotatable stirrer for receiving a container having mixable bone cement ingredients therein; a vacuum pump means connected to said mixing station for maintaining a predetermined negative pressure in the container during mixing of the bone cement ingredients; and a resting station for receiving the container after mixing, said resting station being in selective communication with said vacuum pump means for evacuation of the container during curing of the bone cement.
Claim 23
Dependent Claim
51 words
A device as set forth in claim 18 which further comprises a control means connected to said stirrer and said pump for sequentially operating said stirrer and pump to mix the bone cement ingredients and degassify the mixture under a negative pressure of approximately 500 mbar for a predetermined time interval.
Claim 24
Dependent Claim
60 words
A device as set forth in claim 19 wherein said control means includes a time counter for monitoring each of a rest period, processing period and curing period after said time interval and a temperature sensor for sensing ambient temperatures connected to said time counter for changing the duration of each of said periods as a function of sensed temperature.
References Cited (Backward Citations)
US3063813A
Cited
US3113169A
Cited
US3366369A
Cited
US3640510A
Cited
US4721390A
Cited
US4758096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |