US5252301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the preparation of bone cement
Assignee: Cemvac System AB
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Filing: 1990-01-11
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Granted: 1993-10-12
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Expires: 2010-01-11
Abstract
Abstract The present invention relates to an arrangement for the manufacture of bone cement by mixing together its constituent components comprising a mixing cylinder (1) in the form of a tube with a bottom (2) and a lid (3) and inside the mixing cylinder an axially movable agitator (4). The agitator consists of a piston-like agitator disc (4a), which is perforated by channels (4a1), through which the components of the bone cement are caused to flow during the mixing procedure and an agitator rod (4b) resembling a piston rod operatively connected to the agitator disc (4a) and supported in the lid (3) in such a way that it is free to slide. The invention is characterized in that the agitator rod (4b) has an axial channel (4b1), which is closed off at the agitator disc (4a) in such a way that it is capable of being opened. The bottom (2) is so arranged, under the effect of an axial force, as to be displaced like a piston axially in the direction of the lid (3), in conjunction with which the bone cement flows out through the channel (4b1) after it has been opened.
Inventors
- 👤 Thomas Nilson
- 👤 Jan Thorling
- 👤 Staffan Smeds
- 👤 Soren Jonsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:52
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61B17/8805; A61B17/8825; B; B01; B01F; B01F31/00; B01F31/44; B01F31/441; B01F33/00; B01F33/50; B01F33/501; B01F33/5011; B01F35/00; B01F35/50; B01F35/514; B01F35/71; B01F35/713; B01F35/7137; B01F35/717; B01F35/7173; B01F35/71731; B01F35/75; B01F35/754; B01F35/75425; A61B17/8833; A61B2017/8838; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30561; A61F2/46; A61F2002/4685; A61F2250/00; A61F2250/0058; A61F2250/0071; B01F2101/00; B01F2101/20; B01F23/00; B01F23/50; B01F23/565; B01F33/70
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
An apparatus for manufacturing bone cement by mixing a plurality of constituent components, said apparatus comprising: a mixing cylinder having a bottom and a lid, said bottom being axially movable relative to said lid for expelling bone cement from said cylinder; an agitator axially movably disposed in said cylinder, said agitator including a perforated member; an elongated hollow tube connected to said agitator for guiding bone cement expelled from said cylinder, said tube axially slidably supported by said lid; channel means in said cylinder for drawing gas from said cylinder whereby said constituent components can be drawn into said cylinder; means for connecting said channel means to an evacuation source; and means for introducing said plurality of constituent components into said cylinder.
Claim 2
Independent Claim
122 words
An apparatus for manufacturing bone cement by mixing a plurality of constituent components, said apparatus comprising: a mixing cylinder having a bottom and a lid, said bottom being axially movable relative to said lid for expelling bone cement from said cylinder; an agitator axially movably disposed in said cylinder, said agitator including a perforated member; an elongated hollow tube connected to said agitator for guiding bone cement expelled from said cylinder, said tube axially slidably supported by said lid; channel means in said cylinder for drawing gas from said cylinder whereby said constituent components can be drawn into said cylinder; means for connecting said channel means to an evacuation source; and means for introducing said plurality of constituent components into said cylinder.
Claim 3
Dependent Claim
30 words
The apparatus according to claim 1 wherein said means for introducing is connected to said tube whereby said plurality of constituent components are introduced into said cylinder through said tube.
Claim 4
Dependent Claim
14 words
The apparatus according to claim 1 wherein said means for introducing comprises a funnel.
Claim 5
Dependent Claim
55 words
The apparatus according to claim 1 including closure means for said tube comprising an elongated rod having a sealing means at one end thereof for sealingly closing one end of said hollow tube whereby at least a partial vacuum can be generated in said cylinder to prevent formation of gas bubbles in said bone cement.
Claim 6
Dependent Claim
15 words
The apparatus according to claim 1 wherein said cylinder is composed of a transparent material.
Claim 7
Independent Claim
119 words
An apparatus for manufacturing bone cement by mixing a plurality of constituent components, said apparatus comprising: a mixing cylinder having a bottom and a lid, said bottom being axially movable relative to said lid for expelling bone cement from said cylinder; an agitator axially movably disposed in said cylinder, said agitator including a perforated member; an elongated hollow tube connected to said agitator for introducing constituent components into said cylinder and for guiding bone cement expelled from said cylinder, said tube axially slidably supported by said lid; channel means in said cylinder for drawing gas from said cylinder whereby said constituent components can be drawn into said cylinder; and means for connecting said channel means to an evacuation source.
Claim 8
Independent Claim
119 words
An apparatus for manufacturing bone cement by mixing a plurality of constituent components, said apparatus comprising: a mixing cylinder having a bottom and a lid, said bottom being axially movable relative to said lid for expelling bone cement from said cylinder; an agitator axially movably disposed in said cylinder, said agitator including a perforated member; an elongated hollow tube connected to said agitator for introducing constituent components into said cylinder and for guiding bone cement expelled from said cylinder, said tube axially slidably supported by said lid; channel means in said cylinder for drawing gas from said cylinder whereby said constituent components can be drawn into said cylinder; and means for connecting said channel means to an evacuation source.
Claim 9
Dependent Claim
20 words
The apparatus according to claim 6 including funnel means connected to said tube for guiding constituent components into said tube.
Claim 10
Dependent Claim
53 words
The apparatus according to claim 1 including closure means for said tube comprising an elongated rod having a sealing means at one end thereof for sealingly closing one end of said hollow tube whereby a partial vacuum can be generated in said cylinder to prevent formation of gas bubbles in said bone cement.
Claim 11
Independent Claim
126 words
An apparatus for manufacturing bone cement by mixing a plurality of constituent components, said apparatus comprising: a mixing cylinder having a bottom and a lid, said bottom being axially movable relative to said lid for expelling bone cement from said cylinder; a perforated agitator axially movably disposed in said cylinder; a rod disposed in said cylinder and having one end thereof secured to said agitator, said rod having another end thereof extending out of one end of said cylinder for axially moving said agitator; channel means in said cylinder for drawing air from said cylinder whereby constituent components can be drawn into said cylinder; means for connecting said channel means to an evacuation source; and means for indicating said plurality of constituent components into said cylinder.
Claim 12
Independent Claim
126 words
An apparatus for manufacturing bone cement by mixing a plurality of constituent components, said apparatus comprising: a mixing cylinder having a bottom and a lid, said bottom being axially movable relative to said lid for expelling bone cement from said cylinder; a perforated agitator axially movably disposed in said cylinder; a rod disposed in said cylinder and having one end thereof secured to said agitator, said rod having another end thereof extending out of one end of said cylinder for axially moving said agitator; channel means in said cylinder for drawing air from said cylinder whereby constituent components can be drawn into said cylinder; means for connecting said channel means to an evacuation source; and means for indicating said plurality of constituent components into said cylinder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |