FR2811881A1 - Scarring screw for surgical implant has head preformed to provide guided scarring and receiving comfort cap on threaded stub - Google Patents

Abstract

The scarring screw for a surgical implant has a threaded section to be screwed into the implant. It has a head (220) which is preformed to receive a threaded comfort cap (240) to provide guided scarring. The head can have a threaded stub onto which the cap is engaged. The screw and the cap can be of different materials.

Description

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  METHOD FOR MANUFACTURING A TOOL RANGE CONCERNING

  THE PROSTHETIC FLOOR IN IMPLANTOLOGY AND TOOLS OBTAINED

ACCORDING TO THIS PROCESS

  FIELD OF APPLICATION OF THE INVENTION

  The present invention relates to the field of implantology, in particular to transfers from the office to the laboratory (and vice versa) and to the adaptations making it possible to carry out the various operations of this

  field of application in the best conditions.

DESCRIPTION OF THE PRIOR ART

  The Applicant has found that the various tools and parts such as keys, analogs and even implants were subjected to premature wear due to various factors including the use of a non-noble material for their manufacture and causing poor

use by the practitioner.

  Thus, for example, it appears that the surgical keys are subject to premature wear at their tool head which relates to the screw heads for which they are intended. Similarly, said surgical keys are of such dimensions that it frequently happens that they are swallowed or inhaled by patients. In addition, said keys each have a single tool and cannot be used for other work than those for which they are intended. Also, for each work module corresponds a single gripping member thus encumbering the cost of the complete range

  of tools relating to the prosthetic stage.

  Another aspect of the technological background of the invention having a major drawback concerns the healing screws. Indeed, the healing screws as they are known today and which replace the nurse screw, have the distinction of having a slot to allow their screwing in the implant. However, it appears that this slit causes injury to the patient at the level of his

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  language. The technological background proposes to cement a comfort cap, which makes recovery of said cap very difficult, when the healing phase is over. Indeed, if the cement fulfills its function, the cap is either cut, or removed using a tool called crown wrench

too aggressive for the implant.

  Another aspect of the technological background of the invention having drawbacks noted by the applicant, lies in the transfer of data from the office to the laboratory by the practitioner. To this end, the practitioner uses a transfer stump which is screwed onto the implant in the mouth to allow the impression to be taken. The transfer stump is then screwed into a replica of the implant called the transfer root or dei. Once the impression treated the two parts are found in the plaster. Given their small diameter (between three and five millimeters) and also given the fairly high price of the transfer stump and the transfer root, prosthetists and practitioners re-use them almost constantly. By dint of repeating the operations described above, the working parts of the stump and of the transfer root inherit, repeatedly, from blows, plaster infiltrations, and in certain cases suffer when the stump and the root of transfer

  are made of brass, oxidation, wear, etc.

  Also, data transfer is missing after a certain

  precision time, which should be avoided.

  It is the same for the analogues of the fixing systems of the entire prosthetic stage, such as the "ball" system, the magnetic fixings or the screw type cones whose working parts are subjected to

strong constraints.

  Another aspect of the technological background of the invention having drawbacks noted by the

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  applicant, is located at the level of the implant itself. Indeed, due to the various screwing and unscrewing operations to which it is subjected well before the screwing of a abutment and the installation of a prosthetic crown, it frequently happens that the screw breaks in the implant thereby annihilating all the work done

  previously and requiring complex extraction.

  Another aspect of the technological background having drawbacks noted by the applicant, lies in the parallelism rods which allow practitioners to choose from the first drilling in the jaw relative to the dentition of the patient, the right stump . These parallelism rods are currently made of titanium and are, therefore, particularly

expensive.

  Another aspect of the technological background presenting drawbacks noted by the applicant, is at the level of the depth gauges of the holes made in the jaw bone which, although graduated, do not allow to keep the grip of measure but

  oblige the practitioner to make an effort of memory.

DESCRIPTION OF THE INVENTION

  On the basis of this fact, the applicant carried out research aimed at overcoming the various aforementioned drawbacks. This research led to the realization of several adaptations and modifications following a manufacturing process of a range of tools concerning the prosthetic stage adopting a global concept of interchangeability and integrating disposable elements which make it possible to solve most of the troubles.

encountered in the prior art.

  According to the main characteristic of the invention, the method of manufacturing a range of prosthetic tools comprising the tools commonly used in the various screwing operations, taking impressions, data transfers, etc. made in

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  implantology at the level of the prosthetic stage, is remarkable in that it consists in decomposing the existing tools into several parts according to their function and in producing said separate parts in materials suitable for each function. The advantage of this process is that it offers tools and parts of high precision that can only be used once, which solves the problem of precision. It also makes it possible to envisage, from a solid and reusable common base, a plurality of disposable or interchangeable parts thus guaranteeing the quality of the range

prosthetic tools created.

  To this end, an object of the invention is to propose a surgical key whose working module would be removable to allow, by means of gripping conventionally present on such a key, to receive several types of working modules of lengths and different diameters. Similarly, in case of wear, the working modules can be changed easily. In addition, the surgical key of the invention solves the problem encountered in the prior art because of its smallness and

lack of maneuverability.

  Another object of the invention is to provide a healing unit comprising a healing screw adapted to accommodate a comfort cap in order to avoid any injury caused by the screw-in slot of the head of said healing screw conventionally known. Said comfort cap would

disposable.

  Another object of the invention is to avoid any lack of precision in the transfer of data when taking an impression by proposing stumps, roots and the like for transfer adopting several parts and several materials, some of which will be interchangeable.

and / or disposable.

  Another object of the invention relates to a solution

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  brought to the problems of fracture of the screws in the implants by proposing a threaded tube constituting an interchangeable sheath screwable inside the implant and which would be likely to be dismantled in spite of the fracture of the screw so as not to damage the implant

  itself and without posing any problem for its recovery.

  Another object of the invention relates to the arrangement of a sliding and disposable ring around the depth gauges making it possible to mark the depth of the drilled hole exactly. Similarly, it sometimes happens that the gauges are not the best solution for measuring the depth of the drilled hole also, an object of the invention is to propose

  another solution to depth measurement.

  The fundamental concepts of the invention having just been exposed above in their most basic form, other details and characteristics will emerge more clearly on reading the

  description which follows and with reference to the appended drawings,

  giving by way of nonlimiting example, an embodiment of a range of compliant prosthetic tools

to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

  Figure la is an exploded perspective view of an embodiment of a surgical key according to the invention, Figures lb, lc, ld are perspective views of the working modules adapted to the key illustrated in Figure 1 , Figure 2a is a side view of a healing screw as known in the technological background, Figures 2b and 2c are side views of two embodiments of a healing screw according to the invention , Figure 3a is a side view of a transfer root and a transfer stump as known in

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  technological background, FIGS. 3b and 3c are side views of embodiments of a transfer root and of a transfer stump according to the invention, FIGS. 4a, 5a and 6a are side views fixing analogs of conical, magnetic or ball type as known in the technological background, FIGS. 4b, 5b and 6b are side views of embodiments of fixing analogs according to the invention, La FIG. 7a is a side view in partial section of an implant as known in the technological background, FIG. 7b is a side view in section illustrating an embodiment of an implant according to the invention by accommodating a threaded tube, FIG. 7c is a cross-sectional view of the threaded tube placed in the implant illustrated in FIG. 7b, FIG. 7d is a side view illustrating the threaded tube placed in the implant according to the invention and illustrated in Figure 7b, Figure 8a is a view of c removed from a depth gauge as known in the technological background, FIGS. 8b and 8c are side views of modes

  for producing gauges according to the invention.

  Figure 9 is a side view of an embodiment of a special and conforming depth gauge

to the invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS

  As illustrated in the drawing in FIG. 1a, the surgical key referenced C as a whole is of the type comprising that of a gripping module 110 and a working module 120 fitted fixedly in the gripping module 110 and whose l end 121 can

  cooperate with the head of a square or slotted type screw.

  Conventionally, several keys are necessary for the screwing and unscrewing of the healing screws, of the screws

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  nurse, implants and stumps, etc ... The key C of the invention allows, from a single gripping module 110, to ensure all operations in

  interchanging the working modules 120.

  Interchangeability also has the advantage of making all the operations carried out by the

key C of the invention.

  Thus, the surgical key of the invention C comprises a gripping module 110 and a plurality of working modules 120 such as those illustrated in Figures la, lb, lc, ld whose connection with said gripping module 110 is removable allowing assembly and quick disassembly of

  working modules 120 depending on the operation to be performed.

  According to the preferred but nonlimiting embodiment illustrated, the connection between the working module and the gripping module 110 of the key C is advantageously carried out by means of a pressure screw 111 which, once screwed, bears on the second end 122 of the working module 120 which is inserted inside the gripping module 110 and therefore maintains

  in position the working module 120.

  Of course, the invention is not limited to this only means of holding in position which can be of the type

direct screwing, "clipping", etc ...

  As illustrated, this type of surgical key has the advantage of accommodating with one and the same gripping means 110 working modules 120 of several different lengths and diameters and suitable for heads

of different screws.

  Likewise, the applicant has planned to make the tools or work modules so as to make them disposable to guarantee their efficiency and precision. Indeed, tensile and torsional stresses are often generated by worn or badly used tools and the key C designed by the applicant overcomes this kind of drawback. Thus, the key to the invention clearly highlights

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  implements the process of the aforementioned invention in that the functional parts composing it are effectively separated and produced from different or suitable materials. Another drawback inherent in this type of key, namely the lack of grip of this type of key, led the applicant to design a key C, remarkable in that it includes a flexible link (not illustrated), a first end of which is fixed to said key C and the second end of which is fixed to a weight. This weight, of mass at least greater than that of the key C makes it possible to serve as anchoring to the latter during its manipulation. According to a preferred but nonlimiting embodiment, the rear part 122 of the working module 120 is preformed with a protruding thread when the working module 120 is fitted into the gripping module 110 authorizing the fixing by screwing of the first end of the flexible link. This threaded part further comprises an orifice 123 allowing pinning between the end 122 of the working module 120 and the means of

screwing the flexible link.

  According to another preferred but nonlimiting embodiment, the second end of said flexible link is fixed to the clothing of the manipulator by any fixing device. Thus, the key C of the invention does not

  risk of being swallowed or inhaled by the patient.

  Another object of the invention is illustrated by Figures 2a, 2b and 2c. In Figure 2a is illustrated a healing screw referenced V as a whole, as known in the technological background, namely a threaded rod 210 surmounted by a screw head 220, the connection between the threaded rod 210 and the head 220 being produced by a frustoconical part 230. This type of screw has the disadvantages of injuring the tongue of the patient once installed and therefore necessitating the installation of a

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  comfort cap to avoid injury. However, since this type of screw head is suitable for screwing and not for receiving a comfort cap, sealing by

  cement is necessary for fixing said cap.

  The healing screw V, the embodiments of which are illustrated in FIGS. 2b and 2c, is also of the type of that comprising a threaded part 210 which is screwed into the implant and a head 220. This screw V is remarkable in that said head 220 is preformed so as to receive by screwing a comfort cap 240. The embodiment illustrated in FIG. 2b proposes a healing screw V, the head 220 of which has an external thread onto which the comfort cap 240 preformed is screwed in. this effect. The embodiment illustrated in FIG. 2c proposes a healing screw V, the head 220 of which has a threaded orifice 221 capable of receiving the threaded rod 241 integrated into the cap 240. Of course, always for implementing the manufacturing process the invention, the comfort cap 240 will be made of a material which is identical or different (such as ceramic) from that of the screw V. Likewise, this comfort cap 240 will be

disposable.

  FIG. 3a illustrates a transfer root 310 and

  a transfer stump 320 as known in the background

  technological plan. The transfer root 310 is of the type of that comprising a part 311 which is embedded in a molding material and a part 312 ensuring the connection with the stump 320. Similarly, the transfer stump 320 is of the type of that comprising a part 321 coming to drown in a tight material and a part 322 ensuring

  the link with the transfer root 310.

  As illustrated in the drawing of FIG. 3b, the two respective parts 311, 312 and 321, 322 are separable and of respective suitable materials. This characteristic is particularly advantageous in that it offers the possibility of using particularly noble materials for the connections between the various elements and the use of a less noble or less expensive material for the parts embedded in the molding material during data transfer in the mouth. This characteristic therefore guarantees the quality and precision of data transfer operations by making the embedded parts interchangeable or by

changing for each use.

  As illustrated, the transfer root 310 consists of the part 311 which comes, by means of a threaded hole, to be screwed on the part 312 which consists of two threaded rods, a first ensuring the connection with said embedded part 311 of the transfer root 310 and, a second ensuring the connection with a threaded orifice made in the transfer stump. The transfer stump 320, for its part, consists of the part embedded 321 in the molding material inside which a tapped orifice has been produced which comes in connection with a threaded rod produced on the connecting part 322

with transfer root 310.

  According to the particular embodiment illustrated in FIG. 3c, when the transfer stump 320 is of the screwed type, the tubular part will be produced for example

  plastic and the threaded rod, for example titanium.

  Likewise, according to a particularly advantageous embodiment illustrated in FIG. 3c, said transfer root 310 comprises a metallic threaded insert 312 which, embedded in the material constituting said root, ensures the connection by screwing of stumps 320, the like (cf. FIG. 4b , 5b, 6b) etc ... According to a preferred but nonlimiting embodiment, the transfer root may be constituted by a threaded insert embedded in a plastic form constituting the external shape of the transfer root which is embedded in the molding material during data transfer. According to a

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  another embodiment, the transfer root 320 is

  made of plastic in its entirety.

  The partial or complete realization of the plastic transfer root has the advantage of reducing the cost and, consequently, reducing the interest of destroying the model for the purpose of

recovery of said roots.

  Still according to the same concept, the analogues of

  transfer 400, 500, and 600 such as those known in the background

  technological plan illustrated in the drawings of FIGS. 4a, 5a and 6a and comprising a part taking the shape of the fixing 410, 510, 610 and a part taking the shape of the implant 420, 520, 620, are divided so that that the above two parts are separable and

respective respective materials.

  As with the transfer root and the transfer stump, the threaded orifices 421, 521, 621 can be constituted by threaded inserts embedded in plastic. Similarly, although the solutions proposed are of the type of those adopting a helical connection, the invention is not limited to the type of connection which may

  be made for example by clipping or otherwise.

  Another particularly advantageous characteristic imagined by the applicant resides in maintaining the forms known in the technological background for analogs such as those illustrated in FIGS. 4a, 5a, 6a but by changing the materials to

  know how to go from brass to plastic.

  As illustrated in the drawing of FIG. 7a, a prosthetic implant referenced I as a whole is conventionally of the type of that adopting an external surface 710 facilitating osseointegration and integrating into the jaw bone after drilling of this last, an interior shape including a thread in which is screwed a multitude of accessories

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  prosthetics for the entire duration required by the operations of placing a prosthetic crown such as the nurse screw, the healing screw, the abutment, etc. As explained above, the various operations preceding the placing in place of the prosthetic crown can result in premature wear of the internal thread of the implant or

even permanent damage.

  Also, according to a particularly advantageous characteristic of the invention, the implant I imagined by the applicant is remarkable in that it comprises in its internal thread 720, a tube, threaded 730 on its outer part 731 and its inner part 732, at end of reception of the threaded rods of the various elements conventionally screwed into the implant I. The establishment of a threaded tube 730 internally and externally has the advantage of offering a wear part replaceable for all the prior operations when installing the prosthetic crown. This wearing part will not only keep the internal thread of the implant intact, but also serve itself to receive the abutment, crown support, in the event that this part 730 is not damaged. . Of course, the internal threads 732 and

exterior will be inverted 731.

  According to a particularly advantageous embodiment, the internal diameter of the threaded tube 730 corresponds to the lower standard diameter of the threaded rods of the accessories conventionally used in implantology. As illustrated in FIG. 7c, said threaded tube 730 has slots allowing it to be screwed and unscrewed. These screwing and unscrewing operations must be carried out by a special tool so that the threaded rod possibly fractured inside said tube 730 does not prevent rotation. This tool could be constituted by the working module 120 illustrated in

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figure lc.

  Another improvement implementing the method of the invention relates to a depth gauge 800 of the type ensuring that the depth of the holes drilled in the jaw bone is illustrated and illustrated in the drawing in FIG. 8a. The gauge of the invention, such as that illustrated by the drawings of FIGS. 8b and 8c, is remarkable in that it comprises, slidingly mounted along its length, a locating ring 810 authorizing by sliding the taking and conservation of the measurement,

said ring being disposable.

  As illustrated in the drawing in FIG. 9, the applicant has imagined a new type of depth gauge 800, the latter resumes at the bottom 820, the shape of an implant but undersized in diameter and at the top a handle 830 manipulation. As illustrated, said lower part has millimeter striations in order to facilitate the measurement. The use of a depth gauge taking the shape of the part for which the hole whose depth is

  measured is of course particularly advantageous.

  Another improvement implementing the method of the invention relates to the rods of parallelism (not illustrated). Indeed, the applicant has advantageously imagined a solution to the lack of precision and to the particularly large investment constituted by the rods of parallelism. Thus, the parallelism rod of the invention is remarkable in that it takes the shape of the stump and is made of plastic. This characteristic is particularly advantageous not only in that it proposes to resume the shape of the stump and therefore to provide additional precision in the choice of the latter but also to be made of plastic which allows to have the whole of the range of parallelism rods for a

less investment.

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  It is understood that the method of manufacturing a range of prosthetic tools and the tools obtained, which have just been described and represented above, have

  been for the purpose of disclosure rather than limitation.

  Of course, various arrangements, modifications and

  improvements could be made to the example below

  above, without departing from the scope of the invention

  taken in its broadest aspects and spirit.

Claims (5)

  1. Healing screw (V) of the type comprising a threaded part (210) screwed onto the implant and a head (220), characterized in that said head (220) is preformed so as to receive by screwing a headdress   comfort (240) intended to achieve guided healing.   2. Healing screw according to claim 1, characterized in that the head (220) has an external thread on which the comfort cap is screwed (240).   3. Healing screw according to claim 1, characterized in that the head (220) comprises a threaded orifice (221) and in that the cap (240) comprises a rod threaded (241) corresponding.   4. Healing screw according to one of the   Claims 1 to 3, characterized in that the screw (V) and the   comfort cover (240) are made of different materials. 5. Healing screw according to one of the   Claims 1 to 4, characterized in that the cover comfort (240) is made of ceramic.