Vacuum mixing device with operating element and pump for mixing polymethylmethacrylate bone cement

Patent metadata

Field	Value
Publication number	US-10022687-B2
Application number	US-201615371336-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 7, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A vacuum mixing device for mixing PMMA bone cement from a monomer liquid and a cement powder, the vacuum mixing device comprising at least one cartridge comprising an evacuable interior for mixing of the bone cement, a mixing device for mixing the content in the interior of the at least one cartridge, which is arranged movably in the interior, a receptacle for receiving a separate container containing the monomer liquid or comprising an integrated container containing the monomer liquid, an opening device, which is arranged in the region of the receptacle in a manner movable relative to the receptacle so that, by moving the opening device, a separate container arranged in the receptacle is openable by means of the opening device, or the opening device is arranged in the region of the integrated container in a manner movable relative to the integrated container so that, by moving the opening device, the integrated container is openable by means of the opening device, a pump, in which a movable plunger for generating a negative pressure is arranged and delimits a pump chamber of the pump, and a connection line, which connects the interior of the at least one cartridge to the pump chamber of the pump, wherein the vacuum mixing system comprises an operating element that is operatable from outside, wherein the plunger in the pump is movable manually by means of the operating element, and wherein the opening device is movable relative to the receptacle or relative to the integrated container by means of the same operating element, and the mixing device in the interior of the cartridge is movable by means of the same operating element in order to mix the content in the interior of the cartridge.

First claim

We claim:

1. A vacuum mixing device for mixing polymethylmethacrylate bone cement from a monomer liquid and a cement powder, the vacuum mixing device comprising
at least one cartridge comprising an evacuable interior for mixing of the bone cement,
a mixing device for mixing the content in the interior of the at least one cartridge, which is arranged movably in the interior,
a receptacle for receiving a separate container containing the monomer liquid or comprising an integrated container containing the monomer liquid, an opening device, that is arranged in the region of the receptacle in a manner movable relative to the receptacle such that, by moving the opening device, a separate container arranged in the receptacle is openable by means of the opening device, or the opening device is arranged in the region of the integrated container in a manner movable relative to the integrated container so that, by moving the opening device, the integrated container is openable by means of the opening device,
a pump, in which a movable plunger for generating a negative pressure is arranged and delimits a pump chamber of the pump, and
a connection line, which connects the interior of the at least one cartridge to the pump chamber of the pump, wherein
the vacuum mixing system comprises an operating element that is operatable from outside, wherein the plunger in the pump is movable manually by means of the operating element, and further wherein
the opening device is movable relative to the receptacle or relative to the integrated container by means of the same operating element, and
the mixing device in the interior of the cartridge is movable by means of the same operating element in order to mix the content in the interior of the cartridge.

2. The vacuum mixing device according to claim 1 , wherein the operating element is connected, or is connectable, to the plunger such that the plunger is movable manually in the pump by operation of the operating element.

3. The vacuum mixing device according to claim 1 , wherein the receptacle, at least in regions, has closed side walls for receiving a glass ampoule as separate container, wherein the receptacle has at least one deformable closed side wall and a supporting element is provided opposite the deformable side wall, wherein the opening device is pressable via the operating element against the deformable side wall of the receptacle so that the deformable side wall deforms such that a matching glass ampoule arranged in the receptacle can be broken open by means of the opening device.

4. The vacuum mixing device according to claim 1 , wherein the opening device has a first lever which is mounted rotatably about a first axis in relation to the receptacle or the integrated container, wherein a free end of the first lever is pushable against a deformable side wall of the receptacle or the integrated container, wherein the operating element is formed by a second lever, which is mounted rotatably about a second axis in relation to the receptacle or the integrated container, wherein the second axis divides the second lever into a short lever arm and a long lever arm, wherein an end of the short lever arm is to be pushed by manual operation of the long lever arm against the first lever so that the free end of the first lever pushes against the deformable side wall and deforms this in such a way that a separate container disposed in the receptacle is openable, or pushes the first end of the first lever against the integrated container so that the integrated container opens towards a fluid connection.

5. The vacuum mixing device according to claim 1 , wherein the operating element is manually movable about an axis, wherein the operating element ( 4 ) is operatively connected to or is to be brought into operative connection with the opening device, the pump, and the mixing device such that a first operation of the operating element, and with a further operation of the operating element, the plunger in the pump is to be driven, and the mixing device in the interior is to be driven.

6. The vacuum mixing device according to claim 5 , wherein the plunger of the pump and/or the mixing device are/is to be driven via a flexible cable and/or a rod, wherein a detent means is provided on the flexible cable and/or the rod and after first-time operation of the operating element engages with a mating detent means on the operating element or with a mating detent means connected to the operating element so that, with operation of the operating element subsequent to the latching, the plunger of the pump and/or the mixing device are/is to be driven via the cable and/or the rod by means of the operating element.

7. The vacuum mixing device according to claim 1 , wherein the mixing device is axially movable in the interior in the longitudinal direction by operation of the operating element.

8. The vacuum mixing device according to claim 1 , wherein the mixing device is rotatable about the longitudinal axis of the interior by operation of the operating element, wherein for this purpose a cylinder connected to the mixing device and having an external thread moves in a stationary sleeve having a matching internal thread so that, when the cylinder moves along the longitudinal direction within the sleeve, a rotation of the cylinder is enforced, wherein the rotation of the cylinder transfers to the mixing device in the interior of the cartridge.

9. The vacuum mixing device according to claim 1 , wherein the pump chamber of the pump is gas-tight and is arranged in the interior of the pump, wherein the plunger is manually drivable via the operating element in at least one direction, such that the pump chamber is to be enlarged by the movement of the plunger and the interior of the at least one cartridge is to be evacuable through the connection line by means of the resultant negative pressure created in the pump chamber.

10. The vacuum mixing device according to claim 1 , wherein a first one-way valve is arranged in the connection from the pump chamber to the connection line or in the connection line, which first one-way valve is open or is actively opened when a pressure lower than in the interior of the cartridge prevails in the pump chamber and is in a closed state or is actively closed when a pressure equal to or higher than in the interior of the cartridge prevails in the pump chamber, and a second one-way valve connects the pump chamber to the surroundings of the pump, which second one-way valve is open or is actively opened when a pressure higher than in the surroundings of the pump prevails in the pump chamber and is in the closed state or is actively closed when a pressure equal to or lower than in the surroundings of the pump prevails in the pump chamber.

11. The vacuum mixing device according to claim 1 , wherein the plunger is mounted axially movably in a hollow cylinder, wherein the hollow cylinder is closed on a first side or is closed apart from a feedthrough for a rod or cable connected to the operating element and the plunger, in particular is closed by a closure, wherein a pump chamber is formed in the hollow cylinder between the plunger and the first closed side, wherein the hollow cylinder is open on a second side.

12. The vacuum mixing device according to claim 1 , wherein the plunger is connected or is connectable via a rod and/or a cable to the operating element, and the plunger preferably is to be moved in the pump by operation of the operating element.

13. The vacuum mixing device according to claim 1 , wherein a movable dispensing plunger for discharging the mixed bone cement from the cartridge is arranged in the interior of the cartridge, wherein th

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• A61B2017/8838

  for mixing bone cement or fluid fillers · 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

• A61L24/06

  obtained by reactions only involving carbon-to-carbon unsaturated bonds {(A61L24/043, A61L24/046 take precedence)} · CPC title

• B01F15/0258

  Operations & Transport · mapped topic

• B01F2215/0029

  Operations & Transport · mapped topic