Powder-liquid bone cement mixer with compressed gas connection

Patent metadata

Field	Value
Publication number	US-11529600-B2
Application number	US-201816178188-A
Country	US
Kind code	B2
Filing date	Nov 1, 2018
Priority date	Nov 2, 2017
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A device and method for producing a bone cement paste from a monomer liquid and a cement powder, wherein the device comprises a cartridge with a cylindrical interior chamber for mixing the parent components, whereby the interior chamber of the cartridge is closed on the front side up to a delivery opening for expelling the bone cement paste from the interior chamber, a delivery plunger which is arranged in the interior chamber of the cartridge and which is supported in a linearly movable manner in the direction of the delivery opening, the cement powder, which is arranged in the interior chamber of the cartridge between the delivery opening and the delivery plunger, a monomer receptacle with an interior chamber in which a monomer liquid container containing the monomer liquid is contained, whereby in the monomer receptacle, a conveying plunger is arranged movable in the longitudinal direction of the monomer receptacle, a compressed gas connection, whereby the conveying plunger is arranged between the monomer liquid container and the compressed gas connection or the compressed gas line in the monomer receptacle.

First claim

The invention claimed is:

1. A device for producing a bone cement paste from a monomer liquid and a cement powder as parent components of the bone cement paste, the device comprising:
a cartridge with a cylindrical interior chamber for mixing the parent components, whereby the cylindrical interior chamber of the cartridge is closed on a front side up to a delivery opening for expelling the bone cement paste from the cylindrical interior chamber,
a delivery plunger which is arranged in the cylindrical interior chamber of the cartridge and which is supported in a linearly movable manner in a direction of the delivery opening,
the cement powder which is arranged in the cylindrical interior chamber of the cartridge between the delivery opening and the delivery plunger,
a monomer receptacle with an interior chamber in which a monomer liquid container containing the monomer liquid is contained, whereby in the monomer receptacle a conveying plunger is arranged that is movable in the longitudinal direction of the monomer receptacle,
a compressed gas connection which is directly connected or connected via a compressed gas line in a pressure-tight manner with the interior chamber of the monomer receptacle, whereby the conveying plunger is arranged between the monomer liquid container and the compressed gas connection or the compressed gas line in the monomer receptacle, and
a connection which connects the interior chamber of the monomer receptacle and the cylindrical interior chamber of the cartridge which is permeable to the monomer liquid but impermeable to the cement powder, whereby the monomer liquid container is arranged between the conveying plunger and the connection, wherein a movement of the conveying plunger presses the monomer liquid through the connection into the cylindrical interior chamber of the cartridge.

2. The device according to claim 1 , wherein
the conveying plunger is adapted to be pressed with a gas pressure that is guided via the compressed gas connection into the interior chamber of the monomer receptacle in the direction of the connection, and the monomer liquid container is adapted to be opened by the movement of the conveying plunger.

3. The device according to claim 1 , wherein
the conveying plunger is impermeable to gases and is sealed in a gas-tight manner against the interior walls of the monomer receptacle with at least one circumferential seal.

4. The device according to claim 1 , wherein
the connection comprises at least one passage inside the delivery plunger whereby the at least one passage is permeable with regard to the monomer liquid and gases, and is impermeable with regard to the cement powder, and
the surface of the delivery plunger is impermeable with regard to the cement powder.

5. The device according to claim 1 , wherein
the monomer liquid container, containing the monomer liquid, is arranged between the conveying plunger and the delivery plunger.

6. The device according to claim 1 , wherein
the device has a compressed gas cartridge which is connected or adapted to be connect in a pressure-tight manner to the compressed gas connection, whereby the compressed gas cartridge is a CO 2 cartridge.

7. The device according to claim 1 , wherein
the compressed gas connection comprises a valve or an opening device, whereby the opening device is adapted to open a closed compressed gas cartridge and produce a pressure-tight connection between the compressed gas connection and the compressed gas cartridge, and whereby the compressed gas cartridge and the opening device are supported in the device such that they are adapted to contact each other and the compressed gas cartridge is adapted to be opened in the device through the pushing together of the compressed gas cartridge and the opening device, so that compressed gas flows from the compressed gas cartridge into the interior chamber of the monomer receptacle.

8. The device according to claim 1 , wherein
the device further has a container for a compressed gas cartridge, whereby a compressed gas cartridge inserted into the container is adapted to be opened in the device by a movement of the compressed gas cartridge against the compressed gas connection such that the compressed gas flows out of the compressed gas cartridge into the compressed gas connection.

9. The device according to claim 1 , wherein
a discharge valve is located in the compressed gas connection or in the compressed gas line.

10. The device according to claim 1 , wherein
between the connection and the monomer liquid container, an elastically deformable spacer is arranged and separates the monomer liquid container from the connection by at least 3 mm.

11. The device according to claim 1 , wherein an additive conducting the monomer liquid is distributed in the cement powder.

12. The device according to claim 1 , wherein
the cylindrical interior chamber of the cartridge and the interior chamber of the monomer receptacle form a shared cylindrical interior chamber and align with each other, so that the delivery plunger is adapted to be driven forward with the conveying plunger in the cylindrical interior chamber of the cartridge and the delivery plunger adapted to be pressed into the cylindrical interior chamber of the cartridge.

13. The device according to claim 1 , wherein
on the compressed gas connection or in the compressed gas line a closed overpressure valve is arranged which is adapted to open the compressed gas connection or the compressed gas line to the environment when a threshold pressure is exceeded.

14. The device according to claim 1 , wherein
a rear side of the cartridge is connected with a front side of the monomer receptacle such that the cylindrical interior chamber of the cartridge aligns with the interior chamber of the monomer receptacle.

15. The device according to claim 1 , wherein
a ventilation opening is provided in the compressed gas connection or in the monomer receptacle, whereby the ventilation opening is adapted to be closed through a movement of the compressed gas connection or through a movement of a container for a compressed gas cartridge.

16. The device according to claim 1 , wherein,
on a front side of the delivery plunger facing towards the delivery opening, a hollow cylinder is arranged, whereby the hollow cylinder is open on its front side facing towards the delivery opening and the hollow cylinder extends from the front side of the delivery plunger at least 3 mm into the cylindrical interior chamber of the cartridge.

17. The device according to claim 1 , wherein
the cement powder rests against the full surface of the front side of the delivery plunger.

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• B01F35/7164

  the containers being placed in parallel before contacting the contents · CPC title

• B01F35/71745

  using pneumatic pressure, overpressure, gas or air pressure in a closed receptacle or circuit system · CPC title

• B01F35/7161

  the containers being connected coaxially before contacting the contents · CPC title

• A61L24/06

  obtained by reactions only involving carbon-to-carbon unsaturated bonds {(A61L24/043, A61L24/046 take precedence)} · CPC title

• B01F35/754251

  reciprocating in the mixing receptacle · CPC title