Bone cement applicator with closure system driven by bone cement dough

Patent metadata

Field	Value
Publication number	US-10639088-B2
Application number	US-201715807776-A
Country	US
Kind code	B2
Filing date	Nov 9, 2017
Priority date	Nov 11, 2016
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

One aspect relates to a bone cement applicator for mixing and applying a bone cement, with which the starting components of the bone cement is mixable in a closed cartridge to form a bone cement dough. The cartridge has a multi-part closure system including a discharge opening. At least two parts of the closure system are movable relative to one another, driven by a movement of the mixed bone cement dough, and the discharge opening is opened the movement of the at least two parts of the closure system relative to one another. The movement of the mixed bone cement dough is drivable by a pressure on the bone cement dough.

First claim

What is claimed is:

1. A bone cement applicator for mixing and applying a bone cement, with which the starting components of the bone cement is mixable in a closed cartridge to form a bone cement dough, wherein the cartridge has a multi-part closure system comprising a discharge opening, wherein at least two parts of the closure system are movable relative to one another, driven by a movement of the mixed bone cement dough, and the discharge opening is opened by the movement of the at least two parts of the closure system relative to one another, and wherein the movement of the mixed bone cement dough is drivable by a pressure on the bone cement dough, wherein the closure system comprises a wall that is gas-permeable, but impermeable for powder and liquids, wherein the wall is arranged in the cartridge in such a way that the pressure of the bone cement dough acts on the wall, and thus moves a stopper or a cover with the wall relative to the cartridge and thus opens the cartridge, or thus moves a discharge opening with the wall relative to the cartridge and thus removes a stopper, which is fixedly connected to the cartridge, from the discharge opening, and wherein the wall comprises a porous plate.

2. The bone cement applicator according to claim 1 , characterized in that the bone cement dough is then dischargeable through the opened discharge opening with the same pressure on the bone cement dough as the pressure used to open the closure system.

3. The bone cement applicator according to claim 1 , characterized in that the closure system has a wall with the discharge opening and a stopper, wherein the discharge opening is connected to the surrounding environment of the cartridge and the stopper closes the discharge opening when the cartridge is closed, wherein either the wall with the discharge opening is movable by the pressure of the bone cement dough and the stopper is fixed relative to the cartridge, or the stopper is movable by the pressure of the bone cement dough and the wall is fixed or fixable relative to the cartridge.

4. The bone cement applicator according to claim 1 , characterized in that the cartridge has a cylindrical interior, in which the bone cement dough is mixed, and the pressure on the bone cement dough to open the closure system and to drive out the bone cement dough from the opened cartridge is generatable by linearly advancing a discharge piston mounted axially movably in the interior of the cartridge in the direction of the closure system, and in the direction of a cartridge head of the cartridge, wherein the closure system is disposed at the front side of the cartridge.

5. The bone cement applicator according to claim 4 , characterized in that the powder is contained in a front part of the interior of the cartridge and a container containing the monomer liquid is arranged in a rear part of the interior of the cartridge, wherein the discharge piston is arranged between the container and the powder, and the conveying piston is arranged at a cartridge base opposite the closure system, wherein a conduit means is provided, which connects the front part and the rear part of the interior of the cartridge to one another in a manner permeable for the monomer liquid and for gases and which is impermeable for the powder.

6. The bone cement applicator according to claim 5 , characterized in that at least one feedthrough is provided in the discharge piston and/or between the discharge piston and the inner wall of the interior as conduit means, by which the front part of the interior and the rear part of the interior are connected to one another, wherein a filter impermeable for the powder and permeable for the monomer liquid and gases is arranged in or on the at least one feedthrough.

7. The bone cement applicator according to claim 5 , characterized in that a detent means is arranged on the discharge piston, so that the discharge piston can latch with the cartridge between the front and the rear part of the interior, wherein this latching cannot be released by the forces occurring as the container is opened and a pressure exerted onto the monomer liquid by the conveying piston, but is releasable by a pressure acting on the discharge piston directly from the conveying piston.

8. The bone cement applicator according to claim 5 , characterized in that the volume of the monomer liquid in the container is at least as large as the volume of the gaps filled with air between the powder particles in the front part of the interior of the cartridge, or is at least as large or exactly the same size as the volume of the gaps filled with air between the powder particles in the front part of the interior and the rear part of the interior when the conveying piston bears against the discharge piston, minus the volume of the material of the container and, as applicable, the volume of a filling material in the rear part of the interior.

9. The bone cement applicator according to claim 5 , characterized in that a receiver for excess monomer liquid is provided at the front end of the cartridge or in a cartridge head at the front side of the cartridge, wherein the powder cannot enter the receiver, wherein the receiver is a hydrophilic spongy structure.

10. The bone cement applicator according to claim 5 , characterized in that the powder is pressed into the front part of the interior, and is under pressure in the front part of the interior.

11. The bone cement applicator according to claim 1 , characterized in that in order to mix the bone cement dough, a monomer liquid as a first starting component of the bone cement within the cartridge is pushable by a conveying piston into a powder as second starting component, wherein the conveying piston is pushed in the direction of the closure system, wherein the conveying piston is arranged axially movably in a cylindrical interior of the cartridge.

12. The bone cement applicator according to claim 1 , characterized in that the cartridge is composed of a front cartridge part and a rear cartridge part, which are fixedly connected and screwed to one another, and wherein a cartridge head is fastened to the front cartridge part.

13. The bone cement applicator according to claim 1 , characterized in that in the cartridge, a monomer liquid is contained as first starting component and a powder is contained as second starting component, from which the bone cement dough is mixed within the cartridge, wherein a hydrophilic additive is distributed in the powder, with which additive the monomer liquid is distributable throughout the powder, without a polymerisation of the bone cement beforehand preventing the further distribution of the monomer liquid in the powder.

14. The bone cement applicator according to claim 1 , characterized in that the powder comprises at least one particulate polymethyl methacrylate or polymethyl methacrylate copolymer of the sieve fraction smaller than 100 μm, an initiator, and at least one particulate or fibrous additive that is insoluble in methyl methacrylate, wherein the additive has an absorption capacity of greater than or equal to 0.6 g of methyl methacrylate per gram of additive at room temperature.

15. The bone cement applicator according to claim 1 , characterized in that the interior of the cartridge is connected to the surrounding environment of the bone cement applicator by a connection which is impermeable for the powder, but permeable for gases, wherein the connection is formed by a stopper and/or plastic ring and/or passageway in the wall of the cartridge which is impermeable for the powder but permeable for gases.

16. A bone cement applicator for mixing and a

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• A61B2017/8838

  for mixing bone cement or fluid fillers · CPC title

• A61B17/8825 Primary

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

• A61B17/8805 Primary

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

• A61B17/8816

  characterised by the conduit, e.g. tube, along which fluid flows into the body or by conduit connections · CPC title

• A61B17/8833

  Osteosynthesis tools specially adapted for handling bone cement or fluid fillers; Means for supplying bone cement or fluid fillers to introducing tools, e.g. cartridge handling means · CPC title