Device for mixing and storing polymethylmethacrylate bone cement

Patent metadata

Field	Value
Publication number	US-2016354129-A1
Application number	US-201615171460-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 3, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

A device and methods mix polymethylmethacrylate bone cement and/or store the starting components of the bone cement. The device comprising: a cartridge with an internal space for mixing the bone cement that is closed on one side by means of a mobile dispensing plunger; a monomer container for a monomer liquid and/or a connector for attachment of a monomer container for a monomer liquid such that the monomer container can be opened appropriately in the device such that the monomer liquid flows from the monomer container into the device; a connecting conduit through which the monomer liquid can be guided into the internal space of the cartridge. A first hollow cylinder is connected to the connecting conduit and a second hollow cylinder is connected, via a vacuum conduit, to the internal space of the cartridge, whereby a pumping plunger is shiftable axially in the first hollow cylinder and is arranged in the first hollow cylinder and a vacuum plunger that is shiftable axially in the second hollow cylinder is arranged in the second hollow cylinder, whereby the pumping plunger and the vacuum plunger may be moved simultaneously.

First claim

1 . A device for the mixing of polymethylmethacrylate bone cement and/or for storage of the starting components of the bone cement, the device comprising:
a cartridge ( 1 , 101 , 201 , 301 ) with an internal space ( 24 , 124 , 224 , 324 ) for mixing the bone cement that is closed on one side by means of a mobile dispensing plunger ( 2 , 102 , 202 , 302 ); a monomer container ( 60 , 160 , 260 , 360 ) for a monomer liquid and/or a connector ( 20 , 120 , 220 , 320 ) for attachment of a monomer container ( 60 , 160 , 260 , 360 ) for a monomer liquid such that the monomer container ( 60 , 160 , 260 , 360 ) is openable appropriately in the device such that the monomer liquid flows from the monomer container ( 60 , 160 , 260 , 360 ) into the device; and a connecting conduit ( 38 , 138 , 238 , 338 ) through which the monomer liquid can be guided into the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ), wherein a first hollow cylinder ( 42 , 142 , 242 , 342 ) is connected to the connecting conduit ( 38 , 138 , 238 , 338 ) and a second hollow cylinder ( 12 , 112 , 212 , 312 ) is connected, via a vacuum conduit ( 17 , 117 , 217 , 317 ), to the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ), wherein a pumping plunger ( 44 , 144 , 244 , 344 ) that can be shifted axially in the first hollow cylinder ( 42 , 142 , 242 , 342 ) is arranged in the first hollow cylinder ( 42 , 142 , 242 , 342 ) and a vacuum plunger ( 47 , 147 , 247 , 347 ) that can be shifted axially in the second hollow cylinder ( 12 , 112 , 212 , 312 ) is arranged in the second hollow cylinder ( 12 , 112 , 212 , 312 ), wherein the pumping plunger ( 44 , 144 , 244 , 344 ) and the vacuum plunger can be moved simultaneously ( 47 , 147 , 247 , 347 ).

2 . The device according to claim 1 , wherein the pumping plunger ( 44 , 144 , 244 , 344 ) and the vacuum plunger ( 47 , 147 , 247 , 347 ) are connected to each other appropriately or are moved by means of a shared operating element ( 315 ) such that, when the pumping plunger ( 44 , 144 , 244 , 344 ) is being slid into the first hollow cylinder ( 42 , 142 , 242 , 342 ), the vacuum plunger ( 47 , 147 , 247 , 347 ) in the second hollow cylinder ( 12 , 112 , 212 , 312 ) moves away from the connection to the vacuum conduit ( 17 , 117 , 217 , 317 ), wherein the volume between the vacuum plunger ( 47 , 147 , 247 , 347 ) and the connection 52 , 152 , 252 , 352 ) to the vacuum conduit ( 17 , 117 , 217 , 317 ) in the second hollow cylinder ( 12 , 112 , 212 , 312 ) preferably enlarges such that the negative pressure arising in the second hollow cylinder ( 12 , 112 , 212 , 312 ) causes a gas to flow from the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ) through the vacuum conduit ( 17 , 117 , 217 , 317 ) into the second hollow cylinder ( 12 , 112 , 212 , 312 ).

3 . The device according to claim 1 , wherein the first hollow cylinder ( 42 , 142 , 242 , 342 ) is connected to the monomer container ( 60 , 160 , 260 , 360 ) and/or the connector for attachment of a monomer container ( 60 , 160 , 260 , 360 ) in appropriate manner such that the monomer liquid flows from the opened monomer container ( 60 , 160 , 260 , 360 ) or an opened attached monomer container ( 60 , 160 , 260 , 360 ) into the first hollow cylinder ( 42 , 142 , 242 , 342 ) and such that the connecting conduit ( 38 , 138 , 238 , 338 ) connects the first hollow cylinder ( 42 , 142 , 242 , 342 ) to the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ) in appropriate manner such that the pumping plunger ( 44 , 144 , 244 , 344 ) can be used to push monomer liquid from the first hollow cylinder ( 42 , 142 , 242 , 342 ) through the connecting conduit ( 38 , 138 , 238 , 338 ) into the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ) by actuating the pumping plunger ( 44 , 144 , 244 , 344 ).

4 . The device according to claim 1 , wherein the first hollow cylinder ( 42 , 142 , 242 , 342 ) is arranged between the monomer container ( 60 , 160 , 260 , 360 ) or the connector ( 20 , 120 , 220 , 320 ) for the monomer container ( 60 , 160 , 260 , 360 ) and the internal wall ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ) is arranged in the connecting conduit ( 38 , 138 , 238 , 338 ) between the monomer container ( 60 , 160 , 260 , 360 ) or the connector ( 20 , 120 , 220 , 320 ) for the monomer container ( 60 , 160 , 260 , 360 ) and the internal wall ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ).

5 . The device according to claim 1 , wherein the pumping plunger ( 44 , 144 , 244 , 344 ) and the first hollow cylinder ( 42 , 142 , 242 , 342 ) comprise a smaller cross-sectional area than the vacuum plunger ( 47 , 147 , 247 , 347 ) and the second hollow cylinder ( 12 , 112 , 212 , 312 ), or the vacuum plunger ( 47 , 147 , 247 , 347 ) and the second hollow cylinder ( 12 , 112 , 212 , 312 ) comprise a cross-sectional area at least twice as large as the pumping plunger ( 44 , 144 , 244 , 344 ) and the first hollow cylinder ( 42 , 142 , 242 , 342 ).

6 . The device according to claim 1 , wherein the pumping plunger ( 44 , 144 , 244 , 344 ) and the vacuum plunger ( 47 , 147 , 247 , 347 ) are connected to each other, are affixed to each other or are designed as a single part.

7 . The device according to claim 6 , wherein the side of the vacuum plunger ( 47 , 147 , 247 ) facing the vacuum conduit ( 17 , 117 , 217 ) is arranged on the rear side of the pumping plunger ( 44 , 144 , 244 ) and, correspondingly, the side of the pumping plunger ( 44 , 144 , 244 ) facing the connecting conduit ( 38 , 138 , 238 ) is arranged on the rear side of the vacuum plunger ( 47 , 147 , 247 ).

8 . The device according to claim 1 , wherein the vacuum conduit ( 17 , 117 , 217 , 317 ) is connected to the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ) by means of the dispensing plunger ( 2 , 102 , 202 , 302 ), wherein the dispensing plunger ( 2 , 102 , 202 , 302 ) has a filter ( 328 ) or a screen arranged in it by means of which the vacuum conduit ( 17 , 117 , 217 , 317 ) is connected to the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ).

9 . The device according to claim 1 , wherein the monomer container ( 60 , 160 , 260 , 360 ) is arranged or arrangeable in a flexible ampoule container ( 21 , 121 , 221 ), wherein it provides at least one ventilation opening ( 223 ) in the ampoule container ( 21 , 121 , 221 ).

10 . The device according to claim 1 , wherein a mixing facility ( 26 , 126 , 226 , 326 ) that can be operated from outside is arranged in the cartridge ( 1 , 101 , 201 , 301 ), wherein the mixing facility ( 26 , 126 , 226 , 326 ) can be operated by means of a mixing rod ( 4 , 104 , 204 , 304 ) that is guided through a feed-through in the dispensing plunger ( 2 , 102 , 202 , 302 ) into the interior of the cartridge ( 1 , 101 , 201 , 301 ) and is supported such as to be mobile.

11 . The device according to claim 1 , wherein the internal space ( 24 , 124 , 224 , 324 ) of the cartridge ( 1 , 101 , 201 , 301 ) contains the cement powder.

12 . The device according to claim 1 , wherein a filter ( 32 , 132 , 232 , 332 ) that is impermeable for the cement powder and permeable for the monomer liquid is arranged between the connecting condui

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• B29K2033/12

  Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate · CPC title

• A61L27/16

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• A61L2430/02

  for reconstruction of bones; weight-bearing implants · CPC title

• B29B7/74 Primary

  using other mixers or combinations of {mixers, e.g. of} dissimilar mixers {; Plant} · CPC title

• A61B2017/8838

  for mixing bone cement or fluid fillers · CPC title