Patent Application
20050241965
The present invention relates to a kit for preparing a mixture of natural or synthetic bone filler material with blood or physiological serum, optionally accompanied with ground bone.
A particularly advantageous application of the invention lies in the fields of periodontology, implantology, and orthodontics, where there is a requirement for such a mixture, in particular for filling a socket after extraction or for mitigating a bone volume deficit when performing implantation.
In general, bone filler material is in a dry form, comprising granules or powder packaged in a flask.
At present, there does not exist a device that is simple and reusable and that is adapted to preparing and applying a bone mixture in a bone cavity of a patient.
The practitioner usually mixes the granules or the powder in a sterile cup with the patient's blood or with physiological serum, and optionally with ground bone in order to form a homogenous and malleable composition which is applied by means of a spatula in the bone cavity in question.
The object of the present invention is to propose a kit device that can be used several times, that is simple to use, and that is compact, enabling the practitioner to make up the desired mixture easily from the various components and to condition the mixture in such a manner as to make it ready for injection into the bone cavity of a patient.
More particularly, the invention provides a kit for preparing a mixture of a natural or synthetic bone filler material with blood or serum, the kit comprising a stand, a cup, and a tube for containing the mixture and open at both ends, the stand including receiver means for receiving one end of the tube in a vertical position, and the cup including in its center an orifice which communicates with a sleeve for releasable assembly on the other end of the tube.
Other advantageous but non-limiting characteristics of the kit of the invention are as follows:
The invention also provides a cartridge of mixable bone filler material, the cartridge comprising a tubular shell arranged in such a manner as to form said tube of the kit of the invention.
Finally, the invention provides an implantation set comprising a box containing at least one bone-taking trephine, at least one injection syringe with an injection duct having assembly means at its distal end for releasably assembling with said trephine, and a kit of the invention.
Advantageously, in this implantation set, the height of the box when closed by a lid is substantially equal to the height of the stand with the cup engaged on the receiver means of the stand of said kit so that said box, when closed, is suitable for containing said stand positioned flat on the bottom of the box and carrying said cup on its receiver means.
The following description given with reference to the accompanying drawings, given as non-limiting examples, shows what the invention consists in and how it can be implemented.
In the accompanying drawings:
FIGS. 1 to 3 show a kit device 100 for preparing a mixture of natural or artificial bone filler material with blood or serum, optionally together with ground bone.
The kit 100 comprises a stand 110 in the form of a plate, a cup 120, and a tube 130; 130′ that is to contain the mixture, and that is open at both ends 130A, 130B; 130′A, 130′B.
The stand 110 includes receiver means 111A, 111B for receiving one end 130A; 130′A of the tube 130; 130′ in a vertical position.
In this example, the receiver means is a generally cylindrical peg projecting perpendicularly from the top face of said stand 110. The peg has a base 111A of diameter slightly smaller than the inside diameter of said tube 130, 130′, and surmounted by a stud 111B of smaller diameter. A step is formed at the junction between the base 111A and the stud 111B. This step advantageously receives a sealing ring 113 for establishing a leaktight junction at the opening 130A; 130′A of the tube 130; 130′ between the tube 130; 130′ and said receiver means 111A, 111B.
The receiver means 111A, 111B is preferably provided with releasable assembly means 112 adapted to co-operate with complementary assembly means 131; 131′ provided on the tube 130; 130′.
In this example, the releasable assembly means are bayonet means comprising, in the tube 130; 130′, two grooves 131; 131′ positioned symmetrically about the axis of said tube and opening out into the edge of the opening 130A; 130′A of the tube, these grooves 131; 131′ being shaped to receive rods 112 positioned in corresponding positions on the stud 111B of the peg carried by the stand 110, with assembly being performed by a quarter turn.
Naturally, in other embodiments (not shown), the means for releasably assembling the tube 130; 130′ on the peg could be pin means comprising a housing at the rear end of the tube for co-operating with a pin provided on the peg, the pin being resiliently actuated by means of a spring.
In other variant embodiments (not shown), provision could be made for the assembly means to be of the snap-fastener type or of the screw-fastener type.
In addition, and as shown more particularly in
As shown in
As an example of such a drill device, mention is made of the device described in French patent No. 2 816 824. That drill device is remarkable in that it comprises a trephine fitted internally with a blade for grinding bone. This narrow blade extends longitudinally along the axis of the trephine and has an end provided with two sharp edges forming a point which extends in the plane of the front opening of the trephine. This blade forms part of a drill bit suitable for being releasably assembled to the trephine by bayonet assembly means, as described above, and comprising a mandrel enabling it to be driven in rotation, with the trephine being mounted at the end thereof in releasable manner, secured to said blade and extending in the opposite direction thereto.
In another variant embodiment of the invention that is particularly advantageous, the tube 130 of the kit 100 constitutes the tubular shell of a cartridge of mixable bone filler material.
When it is for use by a dental surgeon, the tube 130; 130′ has an outside diameter lying in the range about 3 millimeters (mm) to 8 mm and it is about 20 mm long. Naturally, when it is for use in orthodontic bone surgery, it may have a diameter and a length that are greater.
Furthermore, according to an essential characteristic of the kit 100 of the invention, its cup 120 has an orifice 121 in the center of its bottom, which orifice communicates with a sleeve 122 suitable for being releasably assembled on the open end 130B; 130′B of the tube 130; 130′ opposite from its end that is engaged on the peg of the stand 110. For this purpose, the inside diameter of the sleeve 122 is equal to the outside diameter of the tube 130; 130′ (ignoring clearance).
The cup 120 of the kit 100 performs two distinct functions.
It forms a funnel enabling the bone mixture to be introduced cleanly into the inside of the tube 130; 130′ so that it is ready for injection into the receiver site in the patient.
On this topic, it should be observed that the cup 120 shown in the figures presents an inside wall that is slightly conical with a flat bottom, however in another variant (not shown) provision could be made for the conical shape of the inside wall of the cup to be more marked and for its bottom also to be conical in shape, opening out into the central orifice 121.
The cup 120 also forms a mixing receptacle into which the practitioner can pour the natural or synthetic bone filler material, the blood or the physiological serum, and optionally ground bone, which can be taken using the trephine-forming tube 130′, and then mix these ingredients together prior to mounting the cup 120 on the tube 130; 130′ while it is mounted vertically on the stand 110 so as to introduce said mixture into the tube 130; 130′.
Advantageously, the stand 110 of the kit 100 includes receiver means for receiving the sleeve 122 of the cup 120 and distinct from said receiver means 111A, 111B for receiving the end of the tube 130; 130′, and adapted to close said orifice 121. The cup 120 is then put into place on said receiver means for storage or for use as a mixing receptacle, prior to being used as a funnel on the tube 130; 130′.
In this case, the receiver means is identical in shape to the receiver means 111A, 111B for receiving the tube 130; 130′ on the stand 110. It is constituted by a generally cylindrical peg standing perpendicularly on the top surface of said stand 110. The peg comprises a base 115 of diameter slightly greater than the inside diameter of said sleeve 121, and surmounted by a stud 114 of smaller diameter that closes the orifice 121. When the stud 114 closes the orifice 121 of the cup 120, its free end comes flush with the bottom of the cup 120. A step 115A is formed at the junction between the base 115 and the stud 114.
Thus, using the invention, the practitioner can take ground bone from the patient with the above-described drilling device, then pour the ground bone into the cup 120 of the kit 100 or into another cup of larger size, mount the trephine tube 130′ on the stand 110 ready to receive the mixture, mix the ground bone together with the synthetic or natural bone filler material and the blood or the physiological serum in the cup 120, and then mount the cup 120 on the tube 130′ in order to introduce the resulting mixture into said tube 130′. The mixture is ready to be injected into the bone cavity of the patient. This injection is advantageously performed by means of an injection syringe having the tube 130′ filled with the mixture mounted on its end.
In a variant, the practitioner can pour the content of the cartridge of the invention into the cup 120 of the kit 100 and then use the tubular shell of said cartridge as the tube 130 of the kit 100, mounting it on the corresponding receiver means of the stand 110. The practitioner can then mix the bone filler material with blood or physiological serum, and then mount the cup 120 on the tube 130 to introduce the mixture obtained in this way into said tube 130. The mixture is ready to be injected into the bone cavity of the patient. This injection is advantageously performed using an injection syringe having the mixture-filled tube 130 mounted on the end thereof.
The piston rods 202, 202′ and the injection ducts 201, 201′ of the bone injection syringes 200, 200′ are held in notches in two strips 4 projecting from the bottom 1A of the box 1.
The box 1 also has a platform 6 with a hole for receiving a mixing cup 7, in this case of rectangular shape, that is of a capacity that is greater than that of the cup 120 of the kit 100.
In this example, the trephines 130′ also constitute tubes for the kit 100 for preparing the mixture.
Advantageously, in this implantation set, the height h of the box 1 when closed by its lid 2 is substantially equal to the height h1 of the cup 120 engaged on the receiver means of the stand 110 of the kit 100, so that, when closed, said box 1 is suitable for containing said stand 110 positioned flat against the bottom 1A of the box 1 and carrying said cup 120 on its receiver means.
The various elements of the kit 100 are made of a biocompatible material, e.g. out of quenched stainless steel. The tube 130 of the kit 100 may be made of a sterilizable synthetic material, particularly when it constitutes the tubular shell of the cartridge of the invention.
The present invention is not limited in any way to the embodiments described and shown, and the person skilled in the art can make any variation thereto in accordance with the spirit of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0404633 | Apr 2004 | FR | national |
