Device for storing and mixing bone cement

Patent metadata

Field	Value
Publication number	US-9840029-B2
Application number	US-201414317113-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Jul 8, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A device stores, mixes, and applies polymethylmethacrylate bone cement. The device comprises a first container for a first pasty component of the bone cement, a dispensing plunger arranged in the first container such that it can be shifted and serves for pressing the content of the first container out of a dispensing opening, a mixing facility for mixing the content of the first container, whereby the mixing facility is arranged in the first container and the mixing facility can be moved in the first container from outside for mixing, and at least one second container for at least one second component of the bone cement is arranged in or on said first container. The second container can be opened, such that the contents of the first container and second container can be mixed with each other in the first container, whereby at least a boundary surface of the first container is formed by a mobile volume compensation element.

First claim

I claim:

1. A device for storing, mixing, and applying polymethylmethacrylate bone cement, comprising:
a first container for a first pasty component of the bone cement;
a dispensing plunger arranged in the first container such that the dispensing plunger is shiftable for pressing a content of the first container out of a dispensing opening;
a mixing facility for mixing the content of the first container, wherein the mixing facility is arranged in the first container and the mixing facility is movable in the first container from outside for mixing; and
at least one second container, for at least one second component of the bone cement, arranged in said first container, wherein the second container is openable, such that contents of the first container and second container are mixable with each other in the first container, wherein at least a boundary surface of the first container is formed by a mobile volume compensation element, wherein the contents of the first container and second container are mixable by pushing a rod or a tube, that is connected to the mixing facility, into the first container and withdrawing the rod or the tube from the first container.

2. The device according to claim 1 , wherein the dispensing plunger is lockable with respect to the first container, on an end of the first container opposite from the dispensing opening.

3. The device according to claim 1 , wherein the rod or the tube is mobile in an axial direction through a gas-tight feed-through through a boundary of the first container such that the mixing facility is movable through a motion of the rod or the tube in order to mix the content of the first container, wherein the rod or the tube is suspended such that the rod or the tube is axially rotatable.

4. The device according to claim 3 , wherein the dispensing opening of the first container is closed and has to be opened before application of the mixed bone cement, wherein the dispensing opening comprises the rod or the tube, and the dispensing opening is arranged opposite from the dispensing plunger.

5. The device according to claim 1 , wherein the first container comprises a cylindrical internal space, and the dispensing plunger in the internal space of the first container is of a shape matching a footprint of the cylindrical internal space.

6. The device according to claim 1 , wherein the at least one second container comprises a membrane, that can be punctured, for a boundary and a mandrel is arranged in the first container and is supported such as to be mobile with respect to the membrane such that the mandrel punctures through the membrane and thus opens the at least one second container such that a content of the at least one second container is mixable with the content of the first container.

7. The device according to claim 6 , wherein the dispensing opening is arranged in the rod or the tube, in that the mandrel is arranged on the dispensing plunger, and in that the at least one second container is located adjacent internal walls of the rod or the tube, a closure of the rod or the tube that is openable, and the membrane for boundaries of the rod or the tube, whereby the rod or the tube is supported such as to be axially mobile in a feed-through through a boundary of the first container such that the rod or the tube including the membrane is pressable onto the mandrel.

8. The device according to claim 1 , wherein the mobile volume compensation element is arranged in the first container such as to be mobile in an axial direction, whereby the mobile volume compensation element comprises a gas-tight feed-through through which the rod or the tube is guided for operation of the mixing facility.

9. The device according to claim 1 , wherein motion of the dispensing plunger out of the first container is limited by a boundary element, wherein the boundary element is a snap-in means.

10. The device according to claim 1 , wherein the mobile volume compensation element is arranged opposite from the dispensing plunger in the first container as a cylindrical volume compensation element that is supported such as to be mobile, wherein the volume compensation element comprises a gas-tight feed-through for the tube or the rod that is supported in the feed-through such as to be mobile.

11. The device according to claim 6 , wherein a core is provided as closure of the dispensing opening, wherein the core can be taken out of the dispensing opening, whereby the core comprises a receptacle for the mandrel.

12. The device according to claim 11 , wherein the core comprises a wiper on the side facing the first container that wipes off powder or cement dough on the inside of the dispensing opening if the core is being pulled from the first container.

13. The device according to claim 1 , wherein the mobile volume compensation element is supported through an elastic spring such as to be mobile with respect to the first container, whereby the spring pushes the volume compensation element into the internal space of the first container.

14. The device according to claim 3 , wherein a side with the rod or the tube is closed by a closure cap comprising a feed-through for the rod or the tube, that covers the mobile volume compensation element and comprises at least one opening for enabling pressure equalisation between at least one surroundings and an intervening space between the closure cap and the covered volume compensation element, wherein an elastic helical spring for pushing the volume compensation element into the internal space of the first container is arranged between the closure cap and the covered volume compensation element, wherein the helical spring is arranged about the rod or the tube.

15. A method for producing a polymethylmethacrylate bone cement using the device according to claim 1 , the method comprising the steps of:
A) providing the device, whereby the first container ( 1 ) is filled with the first pasty component of the bone cement and the second container is filled with the second component of the bone cement;
B) opening the second container;
C) mixing of the first and second components through moving the mixing facility, whereby moving the mixing facility is associated with the rod or the tube, that is connected to the mixing facility, being pushed into and pulled out of the first container repeatedly, whereby the volume change of the content of the first container due to the pushing in and pulling out is compensated for through a motion of the mobile volume compensation element; and
D) applying mixed bone cement through propelling the dispensing plunger forward in the first container.

16. The method according to claim 15 , wherein the dispensing opening is initially closed by a core and the core is removed after step C).

17. The method according to claim 15 , wherein, for opening the second container, the rod or the tube containing the second container is pushed onto a mandrel on the dispensing plunger and thus a membrane or a film/foil closing the second container is punctured and the second container is opened.

18. The method according to claim 15 , wherein the mixing facility is connected to the rod or the tube and the content of the first container is mixed by moving the mixing facility in the first container by moving the rod or the tube into and out of the first container, whereby, in addition, the mixing facility is being rotated by rotating the rod or the tube in the first container.

19. The method according to claim 15 , wherein the first container is filled with the first component of the bone cement

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian

Classifications

• B01F2215/0029

  Operations & Transport · mapped topic

• B01F11/0082

  Operations & Transport · mapped topic

• B01F13/0023

  Operations & Transport · mapped topic

• B29B7/08

  shaking, oscillating or vibrating · CPC title

• B01F11/0054

  Operations & Transport · mapped topic