Implant, in particular a dental implant

• US 7,008,226 B2
• Filed: 04/17/2003
• Issued: 03/07/2006
• Est. Priority Date: 08/23/2002
• Status: Active Grant

• Current Assignee: Woodwelding AG
• Original Assignee: Woodwelding AG
• Inventors: Torriani, Laurent, Aeschlimann, Marcel, Mayer, Jorg
• Primary Examiner(s): O'Connor, Cary E.
• Assistant Examiner(s): STOKES, CANDICE CAPRI
• Application Number:
  US10/417,645
• Publication Number:
  US 20040038180A1
• Time in Patent Office: 1,055 Days
• Field of Search: 433/172, 433/173, 433/174, 433/175, 433/176
• US Class Current: 433/173
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/70 Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
• CPC Class Codes: A61B 2017/00955 thermoplastic
• CPC Class Codes: A61C 8/0012 characterised by the material or composition, e.g. ceramics, surface layer, metal alloy use of specific materials A61K6/00
• CPC Class Codes: A61C 8/0016 polymeric material
• CPC Class Codes: A61C 8/0018 characterised by the shape
• CPC Class Codes: A61C 8/0019 Blade implants
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30032 differing in absorbability or resorbability, i.e. in absorption or resorption time
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30064 Coating or prosthesis-covering structure made of biodegradable material
• CPC Class Codes: A61F 2002/30065 thermoplastic, i.e. softening or fusing when heated, and hardening and becoming rigid again when cooled
• CPC Class Codes: A61F 2002/30067 Coating or prosthesis-covering structure made of thermoplastic material
• CPC Class Codes: A61F 2002/30088 Phase change materials [PCM], e.g. for storing latent heat
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30884 : Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30899 : Protrusions pierced with apertures
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4683 : by applying ultrasonic vibrations
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2210/0071 : thermoplastic
• CPC Class Codes: A61F 2210/008 : Phase change materials [PCM], e.g. for storing latent heat
• CPC Class Codes: A61F 2250/003 : differing in adsorbability or resorbability, i.e. in adsorption or resorption time
• CPC Class Codes: A61L 2430/02 : for reconstruction of bones; weight-bearing implants

Abstract

Am implant (1), in particular a dental implant, comprises surface regions (4) of a first type which have osseo-integrative, inflammation-inhibiting, infection-combating and/or growth-promoting properties, and surface regions (8) of a second type which consist of a material which is liquefiable by mechanical oscillations. The implant is positioned in an opening of e.g. a jawbone and then mechanical oscillations, e.g. ultrasound is applied to it while it is pressed against the jawbone. The liquefiable material is such liquefied at least partly and is pressed into unevennesses and pores of the surrounding bone tissue where after resolidification it forms a positive-fit connection between the implant and the bone tissue. The surface regions of the two types are arranged and dimensioned such that, during implantation, the liquefied material does not flow or flows only very little over the surface regions of the first type such enabling the biologically integrative properties of these surface regions to start acting directly after implantation. The dental implant comprises a central implant part (1) which for example consists of titanium, which comprises at its proximal end a fixation location (3) or an artificial tooth crown, and which forms the surface regions (4) of the first type. Furthermore the implant comprises a peripheral implant part (2) which consists of a liquefiable material and forms the surface regions (8) of the second type. The dental implant achieves with the help of the positive fit a very good (primary) stability which is later taken over by the (secondary) stability of the osseointegration when resorbable liquefiable materials are used or which is supplemented by the stability of osseointegration when non-resorbable liquefiable materials are used.

Claims

1. An implant for implantation in bone tissue, the implant comprising:

a surface adapted to come into contact with the bone tissue, said surface comprising surface regions (4) of a first type and surface regions (8) of a second type, wherein the surface regions (8) of the second type comprise a material being liquefiable by mechanical oscillation and wherein the surface regions of the first and second type (4, 8) are dimensioned and arranged in a manner such that the surface regions of the first type remain at least partly free from liquefied material on implantation by mechanical oscillations.

2. The implant according to claim 1, wherein the surface regions (4) of the first type have osseo-integrative, inflammation-inhibiting, infection-combating and/or growth-promoting properties.

3. The implant according to claim 1, wherein the liquefiable material is a material with thermoplastic properties or with thixotropic properties.

4. The implant according to claim 3, wherein the liquefiable material is a polymer based on lactic acid and/or glycolic acid, a polyhydroxy alkanoate, a polycaprolactone, a polysacharide, a polypeptide, a polydioxanone, a polyanhydride, a polyolefin, a polyacrylate, a polymetacrylate, a polycarbonate, a polyamide, a polyester, a polyurethane, a polysulphone, a polyarylketone, a polyimide, a polyphenyl sulphide, a liquid crystal polymer, a polyacetal, a halogenated polymer, in particular a halogenated polyolefin, a polyphenylene sulphide, a polysulphone, or a polyether or a copolymer or blended polymer of the mentioned polymers or a composite material containing one of the mentioned polymers, or a polymeric;

ceramic or hydraulic cement.

5. The implant according to claim 1, wherein the implant further comprises a central implant part (1) comprising the surface regions (4) of the first type and a fixation location (3) or an artificial tooth crown.

6. The implant according to claim 5, wherein the central implant part (1) is pin-like, plate-like, disk-like or blade-like or anchor-like or that it is adapted to the shape of a natural tooth root.

7. The implant according to claim 5, wherein the central implant part (1) consists at least partly of a metal, a metal alloy, a ceramic material or a composite material.

8. The implant according to claim 5, wherein the central implant part (1) comprises self-cutting elements.

9. The implant according to claim 5, wherein the surface regions (8) of the second type are formed by a peripheral implant part (2) which is arranged at least partly on the outside of the central implant part (1) and which consists of the liquefiable material, and wherein the surface regions (8) of the second type at least locally project beyond the surface regions (4) of the first type.

10. The implant according to claim 9, wherein the surface regions (4, 8) of the first and second type are arranged next to one another and extending parallel to an implantation direction (A).

11. The implant according to claim 9, wherein the peripheral implant part (2) comprises a ring (6′

) of the liquefiable material arranged in the region of a proximal implant end, and fingers (6) integrally formed on the ring (6′

).

12. The implant according to claim 9, wherein the peripheral implant part (2) comprises a plurality of pins (12, 13) which are arranged in through openings or non-through openings of the central implant part (2) and project beyond the central implant part (1).

13. The implant according to claim 9, wherein the central implant part (1) comprises a pin part (1.1) with a fixation location (3) or with an artificial tooth crown, and a body part (1.2) at least partly surrounding the pin part (1.1), and wherein the body part (1.2) is shaped according to the shape of a natural tooth root.

14. The implant according to claim 13, wherein the body part (1.2) is formed ex situ, consists of a rigid material and forms the surface regions (4) of the first type.

15. The implant according to claim 13, wherein the body part (1.2) consists of a material deformable in situ and is surrounded by a flexible layer of the liquefiable material and wherein the surface regions (4) of the first type are formed by parts of the pin part (1.1) which are not surrounded by the body part (1.2).

16. The implant according to claim 5, wherein the liquefiable material (2′

) is contained within the central implant part (1) being sleeve-shaped and wherein the sleeve-shaped central implant part (2) is designed for pressing out the liquefiable material (2′

) between the surface regions (4) of the first type.