Storage and mixing device for producing a bone cement

Patent metadata

Field	Value
Publication number	US-10875000-B2
Application number	US-201715617231-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Jun 8, 2016
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A storage and mixing device for PMMA bone cements having a cylindrical interior of the cartridge that is delimited on a front side by a cartridge head with a closed delivery opening, a plunger which is arranged to be axially movable in the cylindrical interior of the cartridge and which is spaced from the cartridge head. The plunger circumferentially rests against the inner wall of the interior, so that the plunger divides the interior of the cartridge into two sections in a gas-tight manner, a powdery first parent component of the bone cement, which is contained in the interior between the plunger and the cartridge head, a feed-through which is arranged in the cartridge head or in the cylinder barrel of the cartridge between the plunger and the cartridge head, wherein the feed-through is connected to a fluid line in which a monomer liquid as a second parent component of the bone cement is contained or into which a monomer liquid is fillable or introducible. A filter is arrangeable in the cartridge head, in the feed-through and/or in the fluid line, wherein the filter is permeable to the monomer liquid and impermeable to the first parent component, wherein the plunger is spaced from a back side of the cylindrical interior, located opposite the front side, to an extent that, by moving the plunger in the direction of the back side, a reduced pressure is producible in the interior of the cartridge between the plunger and the cartridge head, wherein the reduced pressure is able to suck the monomer liquid out of the fluid line into the interior of the cartridge.

First claim

The invention claimed is:

1. A storage and mixing device for two-component polymethyl methacrylate bone cements, said storage and mixing device comprising:
a cartridge with an interior, wherein the interior is delimited on a front side by a cartridge head with a closed delivery opening;
a plunger arranged to be axially movable in the interior of the cartridge and spaced from the cartridge head, wherein the plunger circumferentially rests against the inner wall of the interior, so that the plunger divides the interior of the cartridge into two sections in a gas-tight manner;
a powdery first parent component of the bone cement contained in the interior between the plunger and the cartridge head;
a container containing a monomer liquid as a second parent component of the bone cement;
a feed-through arranged in the cartridge head or in a cylinder barrel of the cartridge between the plunger and the cartridge head, wherein the feed-through is connected to a fluid line in which the monomer liquid is fillable or introducible;
a filter arranged in at least one of the cartridge head, the feed-through, and the fluid line, wherein the filter is permeable to the monomer liquid and impermeable to the powdery first parent component; and
openings arranged in the container such that air is flowable through the openings into the fluid line from outside,
wherein
the plunger is spaced from a back side of the interior, located opposite the front side, to an extent that, by moving the plunger in the direction of the back side, a reduced pressure is producible in the interior of the cartridge between the plunger and the cartridge head, wherein the reduced pressure is able to suck the monomer liquid out of the fluid line into the interior of the cartridge.

2. The storage and mixing device according to claim 1 , wherein the plunger in the interior of the cartridge is pushable or pullable manually in the direction of the back side of the interior by means of a rod or another force transmission means, so that a reduced pressure is produced in the interior of the cartridge between the plunger and the cartridge head.

3. The storage and mixing device according to claim 2 , further comprising:
an actuating means or a handle affixed to the rod or the force transmission means.

4. The storage and mixing device according to claim 1 , wherein the plunger is spaced from the back side of the interior such that the space for displacement of the plunger to reach the back side is at least equal to the volume of the monomer liquid to be sucked in.

5. The storage and mixing device according to claim 1 , wherein the container is separated from the cartridge and connected or connectable to the fluid line.

6. The storage and mixing device according to claim 5 , wherein the cartridge, the container and the fluid line are connected to a common stand, wherein the container and the fluid line are permanently connected to the stand and the cartridge is releasably connected to the stand.

7. The storage and mixing device according to claim 5 , wherein a monomer liquid container, or a foil bag or a glass ampoule as the monomer liquid container, is contained in the container, which is openable within the container, so that the monomer liquid flows out of the opened monomer liquid container into the fluid line, wherein an opening device for opening the monomer liquid container, operable from outside, is arranged on the container.

8. The storage and mixing device according to claim 7 , wherein the plunger is spaced from the back side of the interior such that the space for displacement of the plunger to reach the back side is at least equal to the volume of the fluid line and the monomer liquid container in which the monomer liquid is contained.

9. The storage and mixing device according to claim 1 , wherein a mixing device is arranged in the interior of the cartridge between the plunger and the cartridge head, by means of which the first parent component is mixable with the monomer liquid in the interior of the cartridge.

10. The storage and mixing device according to claim 9 , wherein the mixing device is operable from outside the cartridge by means of a mixing rod, wherein the mixing rod passes through the cartridge head in a gas-tight manner and is rotatable and movable in the axial direction.

11. The storage and mixing device according to claim 10 , wherein the mixing rod passes through the delivery opening.

12. The storage and mixing device according to claim 10 , wherein the plunger is pushable in the direction of the back side of the interior of the cartridge by means of the mixing rod.

13. The storage and mixing device according to claim 10 , wherein the mixing rod is a delivery pipe in which a manually removable core is arranged, so that the mixed bone cement paste is dischargeable from the interior of the cartridge through the delivery pipe without the core.

14. The storage and mixing device according to claim 1 , wherein, in the interior of the cartridge on the back side, a stop is provided which delimits movement of the plunger in the direction of the back side.

15. The storage and mixing device according to claim 1 , wherein the plunger has at least one latching element which is releasably engageable with a complementary latching element on the inner side of the cartridge in the region of the back side of the interior.

16. The storage and mixing device according to claim 1 , wherein a closable gas-permeable opening is arranged in the cartridge head, wherein a porous disc which is permeable to gases and impermeable to solid particles is arranged between the first parent component and the opening.

17. The storage and mixing device according to claim 16 , wherein the porous disc is arranged in the cartridge head.

18. A method for mixing the parent components of a bone cement using the storage and mixing device according to claim 1 , the method comprising:
a) preventing, via the filter, the powdery first parent component from making its way into the fluid line;
b) moving the plunger in the direction of the back side of the interior of the cartridge, wherein a reduced pressure is produced in the interior of the cartridge between the plunger and the cartridge head due to said movement of the plunger;
c) sucking the monomer liquid out of the fluid line and through the filter into the interior of the cartridge by the reduced pressure in the interior and flowing air through the openings in the container into the fluid line from the outside;
d) mixing the monomer liquid and the first parent component to form the bone cement paste in the interior of the cartridge; and
e) discharging the bone cement paste from the interior of the cartridge through the delivery opening, that is opened, by advancing the plunger in the direction of the cartridge head.

19. The method according to claim 18 , further comprising:
introducing the monomer liquid into the fluid line before b).

20. The method according to claim 19 , wherein, after a monomer liquid container has been opened in the storage and mixing device, the monomer liquid is introduced into the fluid line.

21. The method according to claim 18 , wherein, in b), the plunger is pressed in the direction of the back side of the cartridge by means of a mixing rod, wherein the mixing rod is movably supported in a gas-tight feed-through, in the delivery opening, in the cartridge head, and, in d), the monomer liquid is mixed with the first parent component by moving a mixing device, which is connected to the

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• B01F35/718 Primary

  using vacuum, under pressure in a closed receptacle or circuit system · CPC title

• B01F35/187

  using filters in mixers, e.g. during venting · CPC title

• B01F33/70

  Mixers specially adapted for working at sub- or super-atmospheric pressure, e.g. combined with de-foaming · CPC title

• B01F25/42

  in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions · CPC title

• B01F23/565

  by introducing liquids in solid material, e.g. to obtain slurries · CPC title