Storage and mixing system for pasty cement components and method therefor

Patent metadata

Field	Value
Publication number	US-10086343-B2
Application number	US-201715447193-A
Country	US
Kind code	B2
Filing date	Mar 2, 2017
Priority date	Mar 3, 2016
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A storage and mixing system for pasty two-component polymethyl methacrylate bone cements comprises a tubular cartridge having a cylindrical inner chamber, a dispensing plunger that is axially displaceable in the inner chamber of the cartridge, a partition disposed axially in the tubular cartridge, and a cartridge head which closes one end of the tubular cartridge. The cartridge head has a slot-shaped opening, wherein the partition protrudes from the inner chamber of the cartridge through the slot-shaped opening of the cartridge head, wherein the partition divides the cylindrical inner chamber of the cartridge bounded by the dispensing plunger and the cartridge head into two cavities that are spatially separated from one another. A first pasty cement component is present in the first cavity and a second pasty cement component is present in the separate second cavity, wherein the partition is removable through the slot-shaped opening of the cartridge head so that the two separate cavities are connected to one another after the partition is removed.

First claim

We claim:

1. A storage and mixing system for pasty two-component bone cements, the system comprising:
a tubular cartridge having a cylindrical inner chamber;
a dispensing plunger that is axially displaceable in the inner chamber of the tubular cartridge;
a partition panel disposed axially in the tubular cartridge; and
a cartridge head closing one end of the tubular cartridge,
wherein the cartridge head has a slot-shaped opening and the partition panel protrudes from the inner chamber of the cartridge through the slot-shaped opening of the cartridge head,
wherein the partition panel divides the cylindrical inner chamber of the cartridge bounded by the dispensing plunger and the cartridge head into two cavities that are spatially separated from one another,
wherein the partition panel separates the cylindrical inner chamber of the cartridge in a manner impervious to liquid, and the two cavities are separated from one another in a manner impervious to liquid,
wherein a first pasty cement component is present in a first cavity and a second pasty cement component is present in a second cavity, and
wherein the partition panel is removable through the slot-shaped opening of the cartridge head such that the first and second cavities are connected to one another after the partition panel is removed.

2. The storage and mixing system according to claim 1 , wherein the dispensing plunger is disposed at the end opposite the cartridge head in the inner chamber of the cartridge.

3. The storage and mixing system according to claim 1 , further comprising: a dispensing tube on which a fastening means for fastening to the cartridge is provided, wherein the dispensing tube is to be fastened to the cartridge for replacing the cartridge head.

4. The storage and mixing system according to claim 3 , wherein a ratio of the diameter of the inner chamber of the cartridge to an inside diameter of the dispensing tube is smaller than 5 to 2.

5. The storage and mixing system according to claim 1 , wherein the diameter of the inner chamber of the cartridge is smaller than or equal to 25 mm.

6. The storage and mixing system according to claim 1 , wherein the slot-shaped opening is shaped to match the cross-section of the partition panel.

7. The storage and mixing system according to claim 1 , wherein the first pasty cement component and the second pasty cement component are in contact with one another after removal of the partition panel.

8. The storage and mixing system according to claim 1 , further comprising: at least two guide elements disposed parallel to the longitudinal axis of the cartridge in or on the inside wall of the cartridge, wherein the partition panel engages in the at least two guide elements in a form-locked manner and/or the dispensing plunger comprises a guide element, into which the partition panel is pushed or inserted on the end face delimiting the inner chamber.

9. The storage and mixing system according to claim 8 , further comprising: axial recesses provided on the inner side of the cartridge, serving as guide elements, and/or a linear recess provided on the side of the dispensing plunger facing the cartridge head, serving as a guide element, wherein the ends of the linear recesses are aligned with one another at the axial recesses of the cartridge.

10. The storage and mixing system according to claim 8 , further comprising: axial ribs provided on the inner side of the cartridge, serving as guide elements, and/or a rib provided on the side of the dispensing plunger facing the cartridge head, wherein the ends of the rib on the dispensing plunger are aligned with one another at the axial ribs of the cartridge.

11. The storage and mixing system according to claim 1 , wherein an axial movement of the dispensing plunger in the direction of the cartridge head is blockable by the partition panel if the partition panel spatially divides the inner chamber of the cartridge into the two cavities.

12. The storage and mixing system according claim 1 , further comprising:
two passages provided in the cartridge head, that connect the two cavities to the surrounding area of the storage and mixing system, wherein a plug is disposed in each of the passages, wherein the plugs comprise a detent element on the side of the plug facing the inner chamber of the cartridge.

13. The storage and mixing system according to claim 1 , wherein the partition panel, on the edge to the connection to the inside wall of the cartridge, comprises at least one peripheral rubber-elastic seal and/or has a widening to achieve sealing with the inside wall of the cartridge across a larger surface area.

14. The storage and mixing system according to claim 1 , further comprising:
a loading plunger disposed in each of the cavities, the loading plungers being axially movable in the cavities, wherein the loading plungers are connectable to the dispensing plunger by two mating detent means and at least one vent hole provided in the dispensing plunger, through which air trapped between the loading plunger and the dispensing plunger can escape from the cavities.

15. The storage and mixing system according to claim 1 , wherein the cartridge, the cartridge head, the partition panel and the dispensing plunger are made of plastic material selected from polyethylene co-vinyl alcohol (EVOH), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polymethylmethacrylate-co-acrylonitrile.

16. The storage and mixing system according to claim 1 , wherein the cartridge head is composed with a rubber-elastic plate and a hollow cap, wherein the hollow cap blocks a movement of the rubber-elastic plate away from the cartridge via a protruding rim, and wherein the slot-shaped opening extends through the rubber-elastic plate and divides the rubber-elastic plate into two areas, wherein a passage, which is closed by a plug, is provided in each of the two areas.

17. The storage and mixing system according to claim 1 , further comprising: a hollow cap provided as a connecting element for connecting the cartridge head to the cartridge, wherein the hollow cap comprises an internal thread or an external thread or a bayonet catch or detent elements.

18. The storage and mixing system according to claim 1 , wherein the partition panel, in the region located outside the inner chamber and outside the cartridge head, comprises at least one fastening means for a pulling device for removing the partition panel from the cartridge.

19. The storage and mixing system according to claim 1 , further comprising: a cap disposed on the cartridge head, wherein an upper end of the cap is designed as a handle, and wherein a connecting element is, or detent elements are, disposed at a lower rim of the cap, that connects or connect the cap to the cartridge head in a reversibly detachable manner, wherein a fastening element, that is irreversibly connected or irreversibly connectable to a fastening element of the partition panel, is attached to an inner side of the cap.

20. A method for mixing pasty cement components of a pasty cement dough utilizing the storage and mixing system according to claim 1 , the method comprising consecutively:
a) pulling the partition panel out of the cartridge through the cartridge head, wherein the two cavities are connected to one another;
b) removing the cartridge head from the cartridge, or removing at least two plugs from at least two passages in the cartridge head, whereby the cartridge ( 1 ) is opened;
c) placing on and connecting a dispensing tube to the opened car

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• B05C17/0106

  with means for longitudinally cutting container walls during relative displacement of the piston and its cooperating container · CPC title

• A61B17/8825 Primary

  characterised by syringe details (A61B17/8822, A61B17/8827 take precedence) · CPC title

• A61B2017/8838

  for mixing bone cement or fluid fillers · CPC title

• B05C17/00596

  The liquid or other fluent material being supplied from a rigid removable cartridge having no active dispensing means, i.e. the cartridge requiring cooperation with means of the handtool to expel the material · CPC title

• A61B17/8805

  for introducing fluid filler into bone or extracting it (A61B17/7097, A61B17/8833 take precedence) · CPC title