Dispensing device with elastically driven mixer

Patent metadata

Field	Value
Publication number	US-9956019-B2
Application number	US-201514829836-A
Country	US
Kind code	B2
Filing date	Aug 19, 2015
Priority date	Aug 22, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A mixing device comprises a mixing space for mixing bone cement, at least one mixing element supported in the mixing space such that it can rotate, a gear for rotating the at least one mixing element, and at least one elastically deformable energy-storing element that is connected to the gear such that the gear can be driven by an elastic energy from the energy-storing element and such that the at least one mixing element can be rotated in the mixing space by means of the gear upon the release of elastic energy from the energy-storing element. Additionally, a vacuum mixing system and mixing method comprise the mixing device for mixing the bone cement.

First claim

The invention claimed is:

1. A mixing device for mixing bone cement, the mixing device comprising:
a mixing space for the mixing of the bone cement;
at least one mixing element that is supported in the mixing space such that it is rotatable;
a gear for driving the rotation of the at least one mixing element;
at least one elastically deformable energy-storing element connected to the gear such that the gear can be driven by an elastic energy from the energy- storing element and such that the at least one mixing element is rotatable in the mixing space by means of the gear upon the release of elastic energy from the energy-storing element; and
a cam disc, slidable up and down, connected to the at least one mixing element, wherein motion of the cam disc influences the at least one mixing element such that the at least one mixing element performs at least one periodical axial stroke motion during rotary motion of the at least one mixing element.

2. The mixing device according to claim 1 , wherein the at least one mixing element is arranged on a stirrer shaft, supported such that it can rotate, and in that a rotation of the stirrer shaft is drivable by the gear, whereby the stirrer shaft is guided out of the mixing space through a gas-tight or pressure-tight bushing and is connected to the gear outside of the mixing space.

3. The mixing device according to claim 2 , wherein the stirrer shaft is hollow and forms a conduit for a liquid starting component of the bone cement.

4. The mixing device according to claim 1 , wherein the at least one mixing element is a plurality of mixing vanes, wherein the mixing vanes extend into the mixing space such as to be radial to the rotation axis during the rotation of the mixing vanes in the mixing space and are inclined with respect to a plane perpendicular to the rotation axis.

5. The mixing device according to claim 4 , wherein the mixing vanes are attached or attachable to a stirrer shaft, wherein the mixing vanes are arranged on the stirrer shaft at an axial offset from each other.

6. The mixing device according to claim 5 , wherein the mixing vanes are attached to the stirrer shaft by means of a joint, such that the mixing vanes can be placed against the stirrer shaft.

7. The mixing device according to claim 5 , wherein the mixing vanes are attached to the stirrer shaft in detachable manner, such that the mixing vanes are separatable from the stirrer shaft while the stirrer shaft is being pulled out of the mixing space.

8. The mixing device according to claim 1 , wherein the gear and/or the elastically deformable energy-storing element are locked by means of at least one detachable mechanical lock such that a release of the energy from the energy-storing element is prevented, wherein the at least one mechanical lock is a safety catch and/or a safety pin.

9. The mixing device according to claim 1 , wherein the gear is a cogwheel gear, a friction wheel gear or a power transmission gear.

10. The mixing device according to claim 1 , wherein the elastically deformable energy-storing element is a spring element that is connectable to the gear, wherein the gear can be driven by the spring force of the tensioned spring element, wherein the spring element is a metal spring, a steel leg spring, a steel leaf spring or a steel coil spring.

11. The mixing device according to claim 1 , wherein a release of elastic energy from the energy-storing element effects a rotary motion of the gear, that the gear effects a transmission ratio of at least 2:1 with respect to the at least one.

12. A vacuum mixing system comprising:
the mixing device according to claim 1 , wherein the mixing space contains a cement powder;
a monomer container filled with a fluid monomer; and
a conduit connecting the monomer container to the mixing space in a liquid-permeable manner.

13. The vacuum mixing system according to claim 12 , further comprising:
A base at which a cartridge containing the mixing space is attached in detachable manner and at which the monomer container is attached, wherein the conduit and the elastic energy-storing element are arranged in or on the base.

14. The vacuum mixing system according to claim 12 , wherein a drive axle extends through a seal out of the mixing space and a cogwheel or friction wheel is attached on the part of the drive axle that is arranged outside of the mixing space and is connected to the gear, wherein the drive axle is drivable by means of the cogwheel or friction wheel.

15. The vacuum mixing system according to claim 14 , wherein the mixing space is a part of a cement cartridge, wherein the cement cartridge is dosed on one side by a dispensing plunger or a dispensing plunger system, wherein the dispensing plunger or the dispensing plunger system is axially mobile in the mixing space and is configured for expelling ready-mixed bone cement, and in that the closure thus formed is impermeable for the cement powder and is permeable for a gas, wherein the cement cartridge, before the cement components are being mixed, can be closed appropriately in vacuum-tight manner such that a transfer of the monomer liquid into the mixing space of the cement cartridge to the cement powder under the effect of a vacuum is made feasible.

16. The vacuum mixing system according to claim 15 , wherein a device for generating a vacuum is integrated into the vacuum mixing system.

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• B01F15/0258

  Operations & Transport · mapped topic

• B01F13/003

  Operations & Transport · mapped topic

• B01F2215/0029

  Operations & Transport · mapped topic

• B01F15/00487

  Operations & Transport · mapped topic

• A61B2017/8838

  for mixing bone cement or fluid fillers · CPC title