EP1903978A1

EP1903978A1 - Method for securing a medical element in an implant, and medical element

Info

Publication number: EP1903978A1
Application number: EP06762009A
Authority: EP
Inventors: Michael Augthun; Thomas Böschemeyer; Volkhard-Hagen Clostermann; Nico Dragotto; Klaus Haselhuhn; Manfred Peters; Hubertus Spiekermann; Karl-Wilhelm Theis
Original assignee: Heraeus Kulzer GmbH
Current assignee: Kulzer GmbH
Priority date: 2005-06-13
Filing date: 2006-06-12
Publication date: 2008-04-02
Also published as: US20100268286A1; BRPI0611999A2; DE102005027401A1; CN101180005A; MX2007013900A; CA2605686A1; JP2008543393A; WO2006133874A1

Abstract

The invention discloses in the first instance a method for securing a medical element (1) in an implant (10), in which method a connecting pin (2) of the medical element (1) is first received in a receiving recess (9) of the implant (10) extending in the longitudinal direction (4) into an interior of the implant (10), and a projection (8) on at least one wing (7) of a clip element (6) of the connecting pin (2), movable transversely with respect to the longitudinal direction (4), is brought into engagement with a radially outwardly facing depression (12) in a jacket surface (11) of the receiving recess (9). The invention also relates to a medical element (1) with a connecting pin (2) which can be received in a receiving recess (9) of an implant (10) implantable in a receiving bore in a bone, the receiving recess (9) extending in the longitudinal direction (4) into an interior of the implant (10), and the connecting pin (2) having a clip element (6) with at least one wing (7) movable transversely with respect to the longitudinal direction (4) and, on said wing (7), a radially outwardly protruding projection (8) which can be brought into engagement with a corresponding depression (12) in a jacket surface (11) of the receiving recess (9). To secure the medical element (1) against inadvertent release from the implant (10), the invention proposes that the wing (7) subsequently be secured against radial movement by hardening of a curable compound in the receiving recess (9) and that the medical element be able to be secured in the implant by such a method.

Description

Method for securing a medical element in an implant and medical element

The invention relates, on the one hand, to a method for securing a medical element in an implant, wherein first a connecting pin of the medical element is received in a receiving recess of the implant extending longitudinally into an interior of the implant, and a projection on at least one wing movable transversely to the longitudinal direction a medical element with a connecting pin, which can be received in a receiving recess of an implantable in a receiving bore in a bone implant implant, wherein the receiving recess is a clip element of the connecting pin with a radially outwardly facing recess in a lateral surface of the receiving recess is engaged extends longitudinally into an interior of the implant and the connecting pin extends a clip element having at least one transversely to the longitudinal direction of movable wings and at this a radially outwardly projecting projection has, which is engageable with a corresponding recess in a lateral surface of the receiving recess in engagement.

In the context of implant systems, medical elements can be fastened particularly gently in the bone using such methods. First, a sleeve-shaped implant with a simple closure cap is inserted into the bone. After this - initially functionless and therefore mechanically unloaded - implant healed and firmly connected to the bone, any medical element, in the dental field in particular a replacement tooth, an impression post or a gingiva former can be used. By a clip connection, the medical element can be easily and quickly connected to the receiving recess of the implant and also this connection can be very easily and quickly solve again.

Thus, individual missing natural teeth can be replaced by artificial, but firmly seated replacement teeth. However, such implant systems are also suitable for closing larger gaps between teeth with several natural teeth missing next to each other or else for building a completely new dentition without remaining natural teeth. DE 100 19 339 A1 and DE 103 33 013 A1 describe implant systems in which a medical element is secured in each case according to a method of the aforementioned type.

The clip connection according to the known methods or to the known medical elements must meet high requirements: on the one hand, it must be so easy to insert and detach that the implant firmly bonded to the bone is not excessively loaded in its longitudinal direction either by pressure or by tension. On the other hand, the force required to release the clip connection must remain constant at high and varying loads between the implant and the medical device over a long period of time - typically years to decades for replacement teeth.

If the clip connection is insufficiently designed, the force required to loosen it can be reduced by material fatigue until the medical element unintentionally disengages from the implant.

task

The invention has for its object to secure a medical element of the aforementioned type against unintentional release from the implant.

solution

Starting from the known method is proposed according to the invention that the wing is then secured by curing a curable material in the receiving recess (9) against radial movement. The wing is in this way before the introduction of the securing element unrestricted radially movable and can be used accordingly with minimal effort in the implant. The wing can even be attached to the clip element so articulated that it does not generate any counterforce when inserted into the implant. Only by the cohesive connection with the cured mass, the clip element is fixed and secured in the desired position. The wing is then blocked against radial movement inwards and thus reliably and permanently prevents unintentional release of the medical element from the implant. In a preferred embodiment of the method according to the invention, the curable composition in the receiving recess is hardened with UV light. Working with UV-curable compositions is one of the standard techniques in dental technology and is thus particularly easy to use in this context. In addition, a variety of curable materials are available at low cost, which allow an individual adaptation of the inventive method to the individual case.

Preferably, in the context of a method according to the invention, the wing is additionally secured against radial movement by means of a securing element introduced into the clip element. The use of such a securing element not only increases the durability of the securing of the medical element in the implant. In addition, it also allows - without curable mass - a provisional securing the medical element in the implant, for example, in laboratory operation.

In the context of a method according to the invention, furthermore, the securing element is preferably introduced into a passage opening extending from a proximal end of the connecting pin into the clip element. Such a continuous passage opening offers various options for the design of the method according to the invention and thus increases its variability.

In particular, one end of a light-guiding element can be introduced into the bushing opening (14, 19, 27), the curable composition cured by shading the light-guiding element with UV light, and then the end of the light-guiding element severed, the severed end of the light-guiding element acting as a securing element in the clip element remains. By introducing a light-guiding element directly into a cavity of the clip element, curing is both easier to handle and significantly accelerated in relation to irradiation from the outside of the bone. Finally, the method is considerably simplified in that the end of the light-guiding element remains in the clip element after curing. An elaborate process monitoring to prevent sticking of the light-guiding element, is unnecessary, since even this effect is even desired to increase the connection stability.

In a further preferred embodiment of the inventive method, the securing element is provided with an external thread and in a corresponding Internal thread of the Durchfiihmngsöffhung screwed into the clip member and / or set by means of an elastic locking ring in a radial opening in the passage opening in the longitudinal direction. The purely mechanical securing of the medical element simplifies handling on the one hand. On the other hand, the compounds obtained are insensitive to chemical aging processes compared to polymers. When using a securing ring, the handling of the implant system is further simplified because the end position of the securing element in the medical element according to the invention is defined clearly palpable during installation.

On the other hand, a method according to the invention can be configured such that the securing element is releasably inserted into the clip element. For example, a pin-shaped securing element can be inserted precisely into a cavity of the clip element such that a radial movement of the movable wing and thus an unintentional release of a particular only temporarily inserted into the implant medical element - for example, a cap, an impression post or a gingiva former - reliably avoided.

If, in the context of a method according to the invention, such a curable composition is selected which can be depolymerized, for example using a solvent, then the release of the medical element from the implant is further simplified.

In a preferred embodiment of the method according to the invention, the implant is implanted in a bone with a medical element received therein. The medical element accommodated in the implant during implantation can be, for example, a handling element secured against unintentional loosening analogously to the above-described method, or else a closure or healing cap. This considerably simplifies the handling of the implant system. By implanting with inserted healing cap also the receiving recess of the implant is reliably protected from contamination.

According to a method according to the invention, the implant for the laboratory adaptation of the medical element can be modeled in place instead of in a bone in a device. For example, one facilitates the jaw modeled device the laboratory adaptation in the context of adjacent teeth. The inclusion of the implant in a holding or handling element facilitates the all-round manual processing - cutting, coloring or layer by layer order other material - the medical element.

In such a device, the securing element can be introduced starting from the free end of the connecting pin in the clip element. A short, "from below" in the connecting pin to be inserted securing element may for example be integrated into the device and connected to a safety switch, that a machining of the medical element by means of electrically driven tools only after securing is possible.

In the context of a method according to the invention, moreover, the medical element can be connected to a second medical element via a web, wherein the web is fixed to the medical element according to the invention by means of the securing element. The web can be fixed to the medical element according to the invention, for example by a circumferential collar or by individual radially projecting lugs on the securing element or by gluing with the securing element.

Starting from the known medical elements, it is proposed that the medical element can be secured in the implant by the respective above-described physical features according to one of the aforementioned methods.

embodiment

The invention will be explained below with reference to exemplary embodiments. Show it

1 shows a first inventive medical element,

2 shows a second medical element according to the invention,

3 shows a third medical element according to the invention,

4 shows a fourth medical element according to the invention,

5 shows a fifth medical element according to the invention,

6 shows a sixth medical element according to the invention,

7 shows a seventh medical element according to the invention, 8 shows an eighth medical element according to the invention, FIG. 9 shows a ninth medical element according to the invention.

The first medical element 1 according to the invention shown in FIG. 1 has a connecting pin 2 and a titanium superstructure 3. The connecting pin 2 is initially cylindrical in the longitudinal direction 4 of the connecting pin 2 in the direction of its distal end 5 and then slightly tapered. The connecting pin 2 has a clip element 6 with four wings 7, which have a radially outwardly projecting projection 8 and are movable transversely to the longitudinal direction 4 due to the material elasticity.

The connecting pin 2 of the first medical element 1 is received according to FIG. 1 in a receiving recess 9 of an implant 10, which can be implanted in a receiving bore in a bone (not shown). The receiving recess 9 extends in the longitudinal direction 4 in the implant 10 and has in its inner circumferential surface 11 a projection 8 on the wings 7 corresponding radially outwardly directed recess 12.

The first medical element 1 has, starting from its proximal end 13, a passage opening 14. Through the passage opening 14 is shown in Figure 1, a pin-shaped securing element 15 which prevents a radially inwardly directed movement of the wings 7, positively inserted into the clip member 6 and passed therethrough. The superstructure 3 of the first medical element 1 is modeled on the shape of an incisor tooth and provided with a ceramic layer 16 on the surface. To form the crown of a replacement tooth is applied in a manner not shown in the laboratory plastic layer on the superstructure 3, wherein the passage opening 14 is closed with the plastic.

In contrast to the first medical element 1 shown in FIG. 1, the second medical element 17 shown in FIG. 2 has a right-handed internal thread 20 in a section of the lateral surface 18 of the through-opening 19. The securing element 21 has at its head 22 a matching external thread and a projection 23. To secure the clip element 24 of the second medical element 17, the securing element 21 is initially - as in the first medical Element 1 - introduced into the Durchführungsöffhung 19 and finally screwed in with a few turns. The projection 23 on the fuse element 21 is shown in Figure 2 simplistic slot-shaped, but in order to avoid damage to the internal thread 20 in practice rather internal, for example, designed as a hexagon. By loosening the screw connection, the securing element 21 can be released from the second medical element 17 in a particularly simple manner if required.

In contrast to the second medical element 17 shown in FIG. 2, the third medical element 25 shown in FIG. 3 has a peripheral radial recess 28 in a section of the lateral surface 26 of the leadthrough opening 27. The securing element 29 likewise has a circumferential radial recess 31 in its lateral surface 30. To secure the clip element 32 of the third medical element 25, the securing element 29 is in turn initially inserted into the lead-through opening 27 until a recess 33 engaging in the lead-in opening 27 engages in the recess 31 on the securing element 29.

In contrast to the first medical element 1 shown in FIG. 1, in the fourth medical element 34 shown in FIG. 4, the securing element 35 is designed as a light-guiding element. To secure the fourth medical element 34 a (here as well as in the other embodiments) not shown plastic, curable under UV light filling material placed between the implant 36 and the medical element 34, the fuse element 35 inserted into the clip member 37 and UV Light-connected and separated after curing of the filling material in a manner not shown at the distal end 38 of the medical element 34.

The fifth medical element 39 shown in FIG. 5 essentially differs from the second medical element 17 shown in FIG. 2 by the superstructure 40. This has a ball head 41 on which a denture 42, which is merely indicated in the basic section, or a partial denture, not shown The securing element 43 is in turn secured in the fifth medical element 39 by means of a thread 44, which is only indicated here, in the fifth medical element 39. The attachment 45 on the Securing element 43 is formed as a hexagon with a conical seat 46 in the superstructure 40.

The sixth medical element 47 shown in FIG. 6 differs from the fifth medical element 39 shown in FIG. 5 only by the projection 48, which is here expressed as an internal hexagon.

The seventh medical element 49 shown in FIG. 7 in turn differs from the fifth medical element 39 shown in FIG. 5 essentially in that the securing element 50 -as in the third medical element 25 according to FIG. 3 -hatches in the medical element by means of a securing ring 51 is. The head 52 of the securing element 50 is also slightly undercut mushroom-shaped, so that the securing element 50 can be easily released from the medical element 49 if necessary and the clip element 53 can be released again in this way.

The similar eighth medical elements 54 shown in FIG. 8 differ from the sixth medical element 47 shown in FIG. 6 by the outer shape of the supraconstruction 55, which are substantially cylindrical in the longitudinal direction 56 of the medical elements 54. In the illustration according to FIG. 8, two caps 57 are placed on the medical elements 54, which in turn are firmly connected by a web 58. The caps 57 are fixed by a conical seat 59 on the head 60 of the securing elements 61 on the medical elements 54. A prosthesis not shown "rides" on this web 58, whereby mechanical stress and wear of the clip elements 62 are significantly reduced.

The similar ninth medical elements 63 shown in FIG. 9 in turn differ from the eighth medical elements 54 according to FIG. 8 by the way in which the securing elements 64 are fixed. As in the seventh medical element 49 according to FIG. 7, the securing elements 64 are provided by retaining rings 65 - here, respectively two pieces - secured in the ninth medical elements 63. Likewise, as in the seventh medical element 49, the head 66 of the securing elements 64 is undercut in a mushroom-shaped manner in order to ensure easy detachability. Figures are medical element

connecting pins

superstructure

Longitudinal distal end

clip member

wing

head Start

receiving recess

implant

lateral surface

Deepening of the proximal end

Through opening

Fuse element ceramic layer medical element

lateral surface

Through opening

inner thread

fuse element

head

approach

Clip element medical element

lateral surface

Through opening

puncture

fuse element

lateral surface Groove Clip element Circlip medical element Fuse element Implant Clip element Distal end Medical element (34) Supraconstruction Ball head Bite Fuse element Threaded neck Conical seat Medical element Attachment medical element Locking element Circlip Head Clip element Medical element Supraconstruction Lateral cap Bridge Tapered seat Head Securing element Clip element medical element securing element retaining ring head

Claims

claims

1. A method for securing a medical element (1, 17, 25, 34, 39, 47, 49, 54, 63) in an implant (10), wherein first a connecting pin (2) of the medical element (1, 17, 25 , 34, 39, 47, 49, 54, 63) in a longitudinal direction (4, 56) in an interior of the implant (10) extending receiving recess (9) of the implant (10) and a projection (8) at least a wing (7) of a clip element (6, 24, 32, 37, 53, 62) of the connecting pin (2) that is movable transversely to the longitudinal direction (4, 56) with a recess (12) pointing radially outwards in a lateral surface (11 ) of the receiving recess (9) is engaged, characterized in that the wing (7) is then secured by curing a curable material in the receiving recess (9) against radial movement.

2. Method according to the preceding claim, characterized in that the curable composition in the receiving recess (9) is cured with UV light.

3. The method according to any one of the preceding claims, characterized in that the wing in addition by means of a in the clip element (6, 24, 32, 37, 53, 62) introduced securing element (15, 21, 29, 35, 43, 50, 61 , 64) is secured against radial movement.

4. The method according to any one of claims 3 or 4, characterized in that the securing element (15, 21, 29, 35, 43, 50, 61, 64) in one of a proximal end (13) of the connecting pin (2) outgoing through opening (14, 19, 27) in the clip element (6, 24, 32, 37, 53, 62) is introduced.

5. The method according to claim 2 and one of claims 3 or 4, characterized in that one end of a light-conducting introduced into the passage opening (14, 19, 27), the curable composition cured by wiring the light guide with UV light, then the end the separated light-emitting element and the separated end of the light-guiding element as a securing element (35) in the clip element (37) is left.

6. The method according to the preceding claim, characterized in that the Sicheruηgselement (21, 43, 61) with an external thread (22) is provided and in a corresponding internal thread (20) of the passage opening (19) in the clip element (24, 62) is screwed.

7. The method according to any one of the preceding claims, characterized in that the securing element (29, 50, 64) by means of an elastic locking ring (33, 51, 65) in a in the passage opening (27) radially circumferential recess (28) in the longitudinal direction ( 4).

8. The method according to any one of the preceding claims, characterized in that the securing element (15, 21, 29, 43, 50, 61, 64) releasably in the clip element (6, 24, 32, 53, 62) is introduced.

9. The method according to any one of the preceding claims, characterized in that the implant (10, 36) with a medical element (1, 17, 25, 34, 39, 47, 49, 54, 63) received therein is implanted in a bone ,

10. The method according to any one of claims 1 to 3, characterized in that the implant (10, 36) for laboratory adaptation of the medical element (1, 17, 25, 34, 39, 47, 49, 54, 63) in a model Device is included.

11. The method according to the preceding claim, characterized in that the securing element (15, 29) starting from the free end of the connecting pin (2) in the clip element (6, 32) is introduced.

12. The method according to any one of the preceding claims, characterized in that the medical element (54, 63) connected to a second medical element (54, 63) via a web (58) and the web (58) on the medical element (54 , 63) is fixed by means of the securing element (61, 64).

13. medical element (1, 17, 25, 34, 39, 47, 49, 54, 63) with a

Connecting pin (2) which can be received in a receiving recess (9) of an implant (10, 36) implantable in a receiving bore, wherein the receiving recess (9) extends longitudinally (4, 56) into an interior of the implant (10 , 36), and the connecting pin (2) comprises a clip element (6, 24, 32, 37, 53, 62) with at least one wing (7) movable transversely to the longitudinal direction (4, 56) and projecting radially outwards therefrom Projection (8) engageable with a corresponding recess (12) in a lateral surface (11) of the receiving recess (9), characterized in that the medical element (1, 17, 25, 34, 39, 47, 49, 54, 63) with a method according to one of the preceding claims in the implant (10, 36) is securable.