Implantation aid for the use of surface-sensitive implants

Abstract

The present application relates to an implantation set including a tool or an aid, and at least one bone contact member adapted thereto, therefore a device designed for direct contact with a bone, the bone contact member having a greater hardness in a region intended for contact by the tool or aid than the tool or aid in a region intended for contact with the bone contact member.

Claims

1. A medical implantation set comprising a tool and at least one bone contact member which is adapted thereto and is designed as a device for direct contact with a bone, wherein the bone contact member has a greater surface hardness in a region intended for contact by the tool than the tool in a region intended for contact with the bone contact member, wherein the tool is designed as a screwdriver and the bone contact member is designed as a screw forming an implant and matching the bone contact member for screwing into a bone, wherein the screw has a screw head and a thread, wherein the screw head has a tool mount which is geometrically adapted to an outer contour of a tip of the screwdriver, wherein the screw head has a greater hardness at least in a region of the tool mount than at least a part of the tip of the screwdriver provided for contacting the tool mount, and wherein the tool mount has screwdriver tip contact surfaces aligned in a longitudinal direction of the screw, whereas tool mount contact surfaces at the tip of the screwdriver are aligned so as to be inclined between approximately 2.5° to approximately 7.5° relative to the longitudinal direction of the screw.

2. The implantation set according to claim 1, characterized in that the tool mount is designed as a recess and/or the tool mount has a slot, cross-slot, hexagonal or Torx geometry and the screwdriver at the tip has a matching design.

3. The implantation set according to claim 2, characterized in that geometries and dimensions of the recess in the screw head and the tip of the screwdriver, which is designed as a projection, are adapted to one another such that a self-retaining effect of the screw on the tip is enforced when the tip engages in the recess.

4. The implantation set according to claim 1, characterized in that the screw and the screwdriver each have a through-hole.

5. The implantation set according to claim 4, characterized in that the through-holes of the screw and the screwdriver are of circular cross-section and have a same size in a mutual contact region.

6. The implantation set according to claim 4, characterized in that the through-hole in the screwdriver has a multi-step design.

7. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a polymer with a Rockwell hardness of R30 to R125, M50 to M200, or E50 to E200.

8. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a polymer with a Shore hardness of 20 Shore A to 100 Shore A, 20 Shore B to 100 Shore B, 20 Shore C to 100 Shore C, or 20 Shore D to 100 Shore D.

9. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a ceramic with a Vickers hardness of 800 to 2000.

10. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a fiber-reinforced material with a Rockwell hardness of R30 to R150, M50 to M250, or E50 to E250.

11. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a polymer with a coating or a surface modification having a Rockwell hardness of R30 to R200, M50 to M300, or E50 to E300.

12. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a polymer with a coating or a surface modification having a Shore hardness of 20 Shore A to 200 Shore A, 20 Shore B to 200 Shore B, 20 Shore C to 200 Shore C, or 20 Shore D to 200 Shore D.

13. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a ceramic with a coating or a surface modification having a Vickers hardness of 800 to 3000.

14. The implantation set according to claim 1, characterized in that the tip of the screwdriver comprises a fiber-reinforced material with a coating or a surface modification having a Rockwell hardness of R30 to R150, M50 to M250, or E50 to E250.

15. The implantation set according to claim 1, characterized in that the screw has a Brinell hardness of 70 to 90.

16. The implantation set according to claim 1, wherein each of the tool mount contact surfaces are inclined between approximately 2.5° to approximately 7.5° relative to the longitudinal direction of the screw.

17. A medical implantation set for direct contact with a bone, comprising: a screwdriver; and at least one screw for screwing into the bone; wherein the screw comprises a tool mount which is geometrically adapted to an outer contour of a tip of the screwdriver; wherein the screw has a greater hardness at least in a region of the tool mount than at least a part of the tip of the screwdriver provided for contacting the tool mount; and wherein the tool mount comprises tool mount contact surfaces at the tip of the screwdriver inclined between approximately 2.5° to approximately 7.5° relative to the longitudinal direction of the screw.

18. The medical implantation set of claim 17, wherein each of the tool mount contact surfaces are inclined between approximately 2.5° to approximately 7.5° relative to the longitudinal direction of the screw.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail below using a drawing. Several exemplary embodiments are shown in more detail, which can be modified. In the Figures:

(2) FIG. 1 shows an implantation set according to the invention in a side view with a screwdriver placed on a screw with its tip,

(3) FIG. 2 shows an enlargement of area II from FIG. 1,

(4) FIG. 3 shows an enlargement of area III from FIG. 2,

(5) FIG. 4 shows an enlargement of area IV from FIG. 3.

(6) FIG. 5 is a perspective representation of the area shown in FIG. 4,

(7) FIG. 6 shows a coupling region between the screwdriver and the screw partially shown in longitudinal section,

(8) FIG. 7 is a perspective view of the screw and of the screwdriver shown only in the area of the tip/blade of the screwdriver, in a side view,

(9) FIG. 8 shows the components from FIG. 7 in a perspective view,

(10) FIG. 9 is a perspective view distal to the tip of the screwdriver,

(11) FIG. 10 is a perspective view of the screw head region with its tool mount provided there in the form of a Torx recess to realize a screw drive,

(12) FIG. 11 shows a longitudinal section through the screwdriver of the implantation set from FIG. 1 to realize a two- or three-dimensional hollow structure,

(13) FIG. 12 shows the surgical use of the implantation set together with a biodegradable metallic implant with angle-independent alignment,

(14) FIG. 13 shows an enlargement of a wedging region of the screw with the implant, and

(15) FIG. 14 is a side view to symbolize an angular offset of +/−approx. 15°, within which a wedging of the external thread of the screw with an internal thread of the implant is achieved.

DETAILED DESCRIPTION

(16) The Figures are only schematic in nature and only serve to understand the invention. Identical elements are provided with the same reference signs. The characteristics of the individual exemplary embodiments can also be exchanged with each other.

(17) FIG. 1 shows a first implantation set 1 according to the invention. This has a screwdriver 2. The screwdriver 2 contacts a (bone) screw 3. The screw 3 is intended for screwing into a bone 4, see FIG. 12, and then serves to fasten an implant 5 to the bone 4.

(18) Coming back to FIG. 1, attention is drawn to a tip 6 of the screwdriver 2. This tip 6 engages in a torque-transmitting state in a tool mount 8 of screw 3, namely at an end at the screw head side. The tool mount 8 of screw 3 is designed as a recess 9. The interaction of tip 6 and recess 9 becomes obvious when looking at FIGS. 6 and 8.

(19) Coming back to FIG. 1, it is noticeable that a shaft 11 is interposed between the distally ending tip 6 and a handle/grip region 10 of the screwdriver. The shaft 11 has outer steps 12. There are three outer steps 12.

(20) A bone thread/external thread 13 is present at the end of screw 3 remote from the screw head. An implant contact (external) thread 14 is provided in the screw head region. It may have the same or a different pitch than the bone thread/external thread 13. There is a thread-free region 15 between the bone thread/external thread 13 and the implant contact thread 14 on the outside. This can be seen particularly clearly in FIGS. 2 to 4.

(21) FIG. 5 shows the penetration of the tip 6 of the screwdriver 2 with a regular eightfold Torx configuration on the outside in a matching recess 9 of the tool mount 8 in the screw head 7 of screw 3.

(22) FIG. 6 shows that the tip 6 of the screwdriver 2 has tool mount contact surfaces 16. These tool mount contact surfaces 16 are inclined relative to a longitudinal axis 17 of the screwdriver 2 or the screw 3. An angle α appears. A particularly preferred value for α is 5°, in order to achieve a self-retaining effect with the Torx insert shown. The tool mount contact surfaces 16 make contact with screwdriver tip contact surfaces 18 in the screw 3.

(23) In FIGS. 7 and 8, the screw 3 is shown shortly before being contacted by the tip 6. As can be seen in FIG. 8 and especially in FIG. 9, both the screw 3 and the screwdriver 2 have a through-hole 19.

(24) On the screw side, there is a chamfer 20 at the entrance of the recess 9. This can be clearly seen in FIG. 10.

(25) The fact that the screwdriver 2 has several steps 21 in the through-hole 19 can be seen particularly well in FIG. 11. The handle 10 is a disposable article made of an injection-molded plastic material, whereas the shank 11 may be made from hardened steel if, for example, the screw is made of titanium. The screw 3 may also have a ceramic coating. The tip 6 can be made of a softer material and may be attached to the shaft 11 in connectable fashion. The fact that the through-hole 10 in the region of the handle 10 is larger than in the region of the tip 6 results in a good cleaning effect if, instead of using the handle 10 as a disposable item, it is to be reused and must therefore be cleaned.

(26) An angle-independent use of a tool is indicated in FIG. 12. However, a drilling tool 22 with a drill 23 is used there. Different positions of the drilling tool 22 and the drill 23 are indicated. Instead of the drilling tool 22, the screwdriver can be used with similar or identical angles/positions.

(27) The combination of the implant 5 and the (bone) screw 3 can easily be seen in FIG. 13, as well as in FIG. 14. However, the screw 3 has a slightly different design than the screw 3 used in the above examples.

(28) The hardness for a screw 3 according to Brinell may have values from 70 to 90. The tip 6, which can also be referred to as a blade or blade tip, can also be manufactured as a disposable article, especially made of polymer, and should then have a hardness, e.g. using PEEK 1000, of M105 according to ISO 2039-2 or using PEEK with carbon fibers of M105 according to DIN ISO 2039-2. When using ceramics, a high hardness should prevail. Zirconium oxide or aluminum oxide is an alternative or additional material. Surface modifications such as oxidations, nitrifications and PVD coatings are conceivable. A self-retaining angle of approx. 5° on each side to the longitudinal axis (e.g. when using Torx) is conceivable, or an angle of 1° measured on each side or of 5° measured on each side. This results in sum angles of 5° or 2 to 10°.

(29) It should be apparent that the foregoing relates only to the preferred embodiments of the present application and the resultant patent. Numerous changes and modification may be made herein by one of ordinary skill in the art without departing from the general spirit and scope of the invention as defined by the following claims and the equivalents thereof.

LIST OR REFERENCE NUMERALS

(30) 1 implantation set 2 screwdriver 3 (bone) screw 4 bone 5 implant 6 tip 7 screw head 8 tool mount 9 recess 10 handle/grip region 11 shaft 12 outer step 13 bone thread/external thread 14 implant contact thread 15 unthreaded region 16 tool mount contact surface of the tip of the screwdriver 17 longitudinal axis 18 screwdriver tip contact surface of the screw head of the screw 19 through-hole 20 chamfer 21 step 22 drilling tool 23 drill