Device and method for producing knee spacer components

Patent metadata

Field	Value
Publication number	US-12059353-B2
Application number	US-202117204656-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Mar 20, 2020
Publication date	Aug 13, 2024
Grant date	Aug 13, 2024

Abstract

The invention relates to a device for producing a knee spacer component by curing bone cement paste. The invention also relates to methods for producing knee spacer components using such a device.

First claim

The invention claimed is:

1. A device for producing a knee spacer component by curing bone cement paste, wherein the knee spacer component is provided in a medical field for replacing part of a knee joint comprising an articulating surface of the knee joint, the device having
a casting mold for molding the knee spacer component from a bone cement paste;
a valve seat which is connected to the casting mold, wherein the valve seat has a closed head side with at least one first feed-through, wherein the at least one first feed-through opens into the casting mold;
a valve body which is mounted so as to be rotatable relative to the valve seat and which has a sealing face, wherein the sealing face is oriented in a direction of the closed head side of the valve seat, wherein at least one second feed-through is arranged in the sealing face;
wherein the valve seat and the valve body together form a valve, wherein the valve is reversibly transferable into an open position and a closed position by rotation of the valve body relative to the valve seat, wherein, in the open position of the valve, the at least one first feed-through of the valve seat and the at least one second feed-through of the valve body are located above one another and provide a connection through the valve which is permeable to the bone cement paste, wherein, in the closed position of the valve, the at least one first feed-through of the valve seat is covered by the sealing face of the valve body, wherein, in the closed position of the valve, the casting mold is closed in liquid-tight manner for the bone cement paste;
wherein the valve body is mounted so as to be rotatable about an axis of rotation relative to the valve seat, and wherein the axis of rotation extends along an axis of rotational symmetry of the sealing face of the valve body.

2. The device according to claim 1 , characterized in that
the valve seat is connected to the casting mold so as not to be rotatable relative to the casting mold, and the valve seat is connected fixedly and/or rigidly to the casting mold or is formed as one part with the casting mold.

3. The device according to claim 1 , characterized in that
the valve is manually operable from outside the device, wherein the valve body is manually rotatable relative to the valve seat and the valve is transferable by rotation from the closed position into the open position and from the open position into the closed position.

4. The device according to claim 1 , characterized in that,
in the closed position of the valve, the at least one first feed-through of the valve seat is covered by the sealing face of the valve body, wherein the closed head side of the valve seat and the sealing face of the valve body are spaced apart from one another by a maximum of 2 mm.

5. The device according to claim 1 , characterized in that
the valve body has a port for liquid-tight connection of a bone cement cartridge or for liquid-tight connection of a handle of the device or is firmly connected to such a port.

6. The device according to claim 5 , characterized in that
the device has an adapter element which is connected or connectable to the bone cement cartridge, wherein the adapter element is detachably and interlockingly connected or connectable to the port, such that an interior of the bone cement cartridge is connected or connectable permeably for the bone cement paste via the adapter element to the at least one second feed-through in the valve body, and/or;
the port comprises, for liquid-tight connection of the bone cement cartridge or the handle, an inner thread in the valve body or an outer thread on the valve body, wherein a counter adapter element of the bone cement cartridge has a mating thread matching the inner thread or the outer thread, or the handle of the device has a mating thread matching the inner thread or the outer thread.

7. The device according to claim 1 , characterized in that
the device has a bone cement cartridge for mixing bone cement starting components and for delivering mixed bone cement paste from the bone cement cartridge or
the device has a bone cement cartridge for mixing polymethyl methacrylate bone cement starting components and for delivering mixed polymethyl methacrylate bone cement paste from the bone cement cartridge, wherein the bone cement cartridge contains the bone cement starting components for producing the bone cement paste in mutually separate regions.

8. The device according to claim 1 , characterized in that
the device has a handle which is connectable to the valve body and with which the valve body is rotatable relative to the valve seat, wherein the handle has a cavity for receiving the bone cement paste, wherein the cavity is connected to the at least one second feed-through in liquid-permeable manner.

9. The device according to claim 1 , characterized in that
a sum of all free openings of the at least one first feed-through in the closed head side is at most as large as the closed surface of the head side and a sum of all free openings of the at least one second feed-through in the sealing face is at most as large as the closed surface of the sealing face.

10. The device according to claim 1 , characterized in that
the valve seat has an inner thread on an inside and the valve body has a matching outer thread on an outside, such that the valve body is able to be screwed into the valve seat.

11. The device according to claim 1 , characterized in that
the casting mold has a trough-shaped mold with a cavity and a punch, wherein the punch is insertable or inserted into the cavity of the trough-shaped mold and the punch is axially displaceable in the cavity, and wherein the trough-shaped mold has a cavity bottom, wherein the cavity bottom forms a contour of one or more articulating sliding surfaces of the knee spacer component.

12. The device according to claim 11 , characterized in that
the valve seat is arranged at an end of a portion of the punch which shapes a stem of the knee spacer component.

13. The device according to claim 1 , characterized in that
the at least one first feed-through in the closed head side has the same size and shape as the at least one second feed-through in the sealing face and/or
the at least one first feed-through in the closed head side is two first feed-throughs and the at least one second feed-through in the sealing face is two second feed-throughs, wherein the two first feed-throughs are arranged in the valve seat in quadrants arranged opposingly with regard to an axis of rotation of the valve body and the two second feed-throughs are arranged in the sealing face in quadrants arranged opposingly with regard to the axis of rotation of the valve body.

14. The device according to claim 1 , characterized in that
a collar is arranged on the sealing face of the valve body, which said collar on the sealing face of the valve body rests on an edge of the valve seat or a collar is arranged on the closed head side of the valve seat, which said collar on the closed head side of the valve seat rests on an edge of the valve body.

15. The device according to claim 1 , characterized in that
a handgrip is fastened or fastenable to the valve body, wherein the handgrip has at least one radial extent with regard to an axis of rotation of the valve body,
wherein the handgrip is fastened or fastenable to an opposite side of the valve body from the sealing face, wherein the valve body may be rotated by a maximum of 90° relative to the valve seat.

16. The device according to claim 1 , characterized in that
the valve body and the valve seat are

Assignees

• Heraeus Medical Gmbh

Inventors

• Vogt Sebastian
• Kluge Thomas

Classifications

• B29L2031/7532

  Artificial members, protheses · CPC title

• B29K2033/12

  Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate · CPC title

• B29C45/26

  Moulds · CPC title

• B29C45/23

  Feed stopping equipment · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title