Device for mixing and storing polymethyl methacrylate bone cement with pressure pump and ampoule breaker

Patent metadata

Field	Value
Publication number	US-10143979-B2
Application number	US-201715479919-A
Country	US
Kind code	B2
Filing date	Apr 5, 2017
Priority date	Apr 6, 2016
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A device mixes bone cement and stores parent components of the bone cement. The device has a cartridge comprising an interior, that is closed on one side by a movable delivery plunger, a receptacle comprising side walls for receiving a monomer liquid container that are closed at least in some regions. The receptacle has at least one deformable closed side wall, a screen and/or a filter arranged below the receptacle so that the contents of the opened monomer liquid container flow through the screen and/or the filter. The device further has a connecting line through which the monomer liquid is to be routed into the interior of the cartridge, a hollow cylinder which is connected to the connecting line and which is connected to the receptacle by way of a fluid connection so that the hollow cylinder is arranged in a fluid line between the receptacle and the interior of the cartridge. A pump plunger is arranged in the hollow cylinder, which is axially displaceable in the hollow cylinder, and an opening device, which is movably mounted against the deformable side wall of the receptacle. The opening device extends into the hollow cylinder, wherein, by pressing the pump plunger into the hollow cylinder, the opening device is to be pressed against the deformable side wall of the receptacle so that the deformable side wall deforms such that a monomer liquid container located in the receptacle is to be opened by the pressure of the opening device.

First claim

We claim:

1. A device for mixing bone cement and for storing the parent components of the bone cement, wherein at least a monomer liquid and a cement powder are parent components of the bone cement, the device comprising:
a cartridge comprising an interior for mixing the bone cement, wherein the interior is closed on one side by a movable delivery plunger;
a receptacle comprising side walls for receiving a monomer liquid container, which side walls are closed at least in some regions, wherein the receptacle has at least one deformable closed side wall;
at least one selected from a screen and a filter which is or are arranged below the receptacle so that the contents of the opened monomer liquid container flow through the at least one selected from the screen and the filter;
a connecting line through which the monomer liquid is to be routed into the interior of the cartridge;
a hollow cylinder connected to the connecting line and which is connected to the receptacle by way of a fluid connection so that the hollow cylinder is arranged in a fluid line between the receptacle and the interior of the cartridge, wherein a pump plunger is arranged in the hollow cylinder, which is axially displaceable in the hollow cylinder; and
an opening device movably mounted against the deformable side wall of the receptacle, wherein the opening device extends into the hollow cylinder, wherein, by pressing the pump plunger into the hollow cylinder, the opening device is to be pressed against the deformable side wall of the receptacle so that the deformable side wall deforms in such a way that a monomer liquid container located in the receptacle is to be opened by the pressure of the opening device.

2. The device according to claim 1 , wherein the monomer liquid is flowable out of the opened monomer liquid container into the hollow cylinder, and the connecting line connects the hollow cylinder to the interior of the cartridge in such a way that, by means of the pump plunger, the monomer liquid is to be pressed out of the hollow cylinder through the connecting line into the interior of the cartridge by pressing the pump plunger into the hollow cylinder.

3. The device according to claim 1 , further comprising:
a mixing device, which is externally operable, is arranged in the cartridge, wherein the mixing device is operable by way of a mixing rod which is guided through a feed-through in the delivery plunger into the interior of the cartridge and which is movably mounted.

4. The device according to claim 1 , wherein the cement powder is contained in the interior of the cartridge.

5. The device according to claim 1 , wherein a powder filter that is impermeable to the cement powder and permeable to the monomer liquid is arranged between the connecting line and the interior of the cartridge.

6. The device according to claim 5 , wherein at least one selected from:
the device has a stand in which at least part of the connecting line is arranged, wherein the cartridge is releasably connected to the stand by way of a screw thread; and
the powder filter that is impermeable to the cement powder and permeable to the monomer liquid is optionally arranged in the connection between the cartridge and the stand.

7. The device according to claim 1 , wherein the receptacle leads into the hollow cylinder at a circumferential surface of the hollow cylinder.

8. The device according to claim 1 , wherein the connecting line is connected to the hollow cylinder at the lowest point of the hollow cylinder, wherein the pump plunger is arranged on the opposite side of the hollow cylinder.

9. The device according to claim 1 , wherein the hollow cylinder has, on the side opposite the pump plunger, a conical, semi-conical or otherwise downwardly tapering base, wherein the face of the pump plunger, which faces the base of the hollow cylinder, forms a negative shape of the base form-fitting the shape of the base.

10. The device according to claim 1 , wherein the device has a tensioned pressure spring and at least one detent, wherein the pressure spring and/or the pump plunger is or are releasably arrested by the detent, wherein the pressure spring exerts a pressure on the pump plunger, when the detent is released so that the pump plunger is pressed into the hollow cylinder.

11. The device according to claim 1 , wherein the connecting line between the hollow cylinder and the interior of the cartridge has an upwardly pointing loop, wherein the highest point of the loop is located above a mouth of the receptacle leading into the hollow cylinder.

12. The device according to claim 1 , wherein the volume in the hollow cylinder is smaller than or equal to the volume of the monomer liquid in the monomer liquid container.

13. The device according to claim 1 , wherein the opening device is a lever which is mounted against the receptacle to be rotatable about an axis, wherein a free end of the lever is pressable against the deformable side wall of the receptacle by the pump plunger, so that the free end of the lever deforms the deformable side wall in such a way that the monomer liquid container located in the receptacle and matching the receptacle is to be opened by the pressure of the free end of the lever, is to be broken open or split open or punctured.

14. The device according to claim 13 , wherein the free end, with the lever, is arranged inside the hollow cylinder, and abuts against the deformable side wall, in such a way that the lever, starting from the axis with the free end and the deformable side wall, forms a triangle with a web as a leg opposite the corner formed by the axis of rotation, wherein the triangle is arranged in the hollow cylinder.

15. The device according to claim 1 , wherein the receptacle is a hollow cylinder and/or the receptacle consists of an elastomer or comprises an insert made of an elastomer, wherein the elastomer has a Shore hardness of greater than 60.

16. The device according to claim 1 , wherein a shoulder for supporting the monomer liquid container is arranged in the receptacle, wherein the shoulder is smaller than half the area of the base of the monomer liquid container or the cross-section of the monomer liquid container.

17. The device according to claim 1 , wherein, upon a movement of the pump plunger into the hollow cylinder, a free end of the opening device presses on the deformable side wall in such a way that the vector of the force has a component which is directed towards the screen and/or filter and/or which presses a monomer liquid container inserted in the receptacle into the receptacle in the direction of a shoulder.

18. The device according to claim 1 , wherein the opening device extends into the hollow cylinder above the fluid connection.

19. The device according to claim 1 , wherein the pump plunger is fixable in place by a manually releasable latching device which, after an axial displacement of the pump plunger over the opening device in the hollow cylinder, locks the pump plunger above a mouth of the fluid connection to the receptacle in the hollow cylinder, so that the pump plunger in the hollow cylinder is not movable over the mouth of the fluid connection when the latching device is not released, wherein the latching device is arranged on or in the pump plunger or extends through the pump plunger.

20. A method for mixing a bone cement chronological comprising:
A) pressing the pump plunger into a hollow cylinder of the device according to claim 1 , wherein the opening device is pressed against the deformable side wall of the re

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• 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

• A61B2017/8838

  for mixing bone cement or fluid fillers · CPC title

• A61B17/8822

  characterised by means facilitating expulsion of fluid from the introducer, e.g. a screw pump plunger, hydraulic force transmissions, application of vibrations or a vacuum · CPC title

• A61B17/8816 Primary

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

• B01F15/0087

  Operations & Transport · mapped topic