US20040006346A1 — Implant, arrangement comprising an implant, and m…

Claim 1

Independent Claim 182 words

1 . A screw implant ( 1 ) for insertion into a bore hole ( 50 ) arranged in bone tissue, said implant having a cancellous portion ( 3 ), and a cortical portion ( 2 ) having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting an outer surface which is threaded for accomplishing said engagement, and having an outer design such that, when being screwed into said bore hole under action of a screwing torque, said cortical portion ( 2 ) acts so as to increase the compression of the cortical bone tissue only, in essentially radial directions of the implant, resulting in a distinct increase of the screwing torque needed for screwing the implant ( 1 ), which increase is usable as an indication that the implant ( 1 ) is in place or nearly in place in the bore hole.

Claim 2

Dependent Claim 182 words

1 . A screw implant ( 1 ) for insertion into a bore hole ( 50 ) arranged in bone tissue, said implant having a cancellous portion ( 3 ), and a cortical portion ( 2 ) having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting an outer surface which is threaded for accomplishing said engagement, and having an outer design such that, when being screwed into said bore hole under action of a screwing torque, said cortical portion ( 2 ) acts so as to increase the compression of the cortical bone tissue only, in essentially radial directions of the implant, resulting in a distinct increase of the screwing torque needed for screwing the implant ( 1 ), which increase is usable as an indication that the implant ( 1 ) is in place or nearly in place in the bore hole.

Claim 3

Dependent Claim 133 words

2 . A screw implant ( 1 ) for insertion into a bore hole ( 50 ) arranged in bone tissue, said implant having a cancellous portion ( 3 ) presenting an outer surface, and a cortical portion ( 2 ) having an axial length, such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (α) of less than 5° in relation to the outer surface of the cancellous portion ( 3 ).

Claim 4

Dependent Claim 133 words

2 . A screw implant ( 1 ) for insertion into a bore hole ( 50 ) arranged in bone tissue, said implant having a cancellous portion ( 3 ) presenting an outer surface, and a cortical portion ( 2 ) having an axial length, such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (α) of less than 5° in relation to the outer surface of the cancellous portion ( 3 ).

Claim 5

Dependent Claim 141 words

3 . A generally cylindrical screw implant ( 1 ) for insertion into a cylindrical bore hole ( 50 ) arranged in bone tissue, said implant ( 1 ) having a cancellous portion ( 3 ) presenting a cylindrical outer surface, and a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (a) of less than 5° in relation to the cylindrical outer surface of the cancellous portion ( 3 ).

Claim 6

Dependent Claim 141 words

3 . A generally cylindrical screw implant ( 1 ) for insertion into a cylindrical bore hole ( 50 ) arranged in bone tissue, said implant ( 1 ) having a cancellous portion ( 3 ) presenting a cylindrical outer surface, and a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (a) of less than 5° in relation to the cylindrical outer surface of the cancellous portion ( 3 ).

Claim 7

Dependent Claim 160 words

4 . A screw implant ( 1 ) for insertion into a bore hole ( 50 ) arranged in bone tissue, comprising a cancellous portion ( 3 ) having a lower cylindrical cancellous portion ( 3 ′) and an upper conical cancellous portion ( 3 ″) presenting a conical outer surface, wherein said implant ( 1 ) is provided with a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (α) of less than 5° in relation to the outer surface of the upper, conical cancellous portion ( 3 ″).

Claim 8

Dependent Claim 160 words

4 . A screw implant ( 1 ) for insertion into a bore hole ( 50 ) arranged in bone tissue, comprising a cancellous portion ( 3 ) having a lower cylindrical cancellous portion ( 3 ′) and an upper conical cancellous portion ( 3 ″) presenting a conical outer surface, wherein said implant ( 1 ) is provided with a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (α) of less than 5° in relation to the outer surface of the upper, conical cancellous portion ( 3 ″).

Claim 9

Dependent Claim 34 words

5 . A screw implant ( 1 ) according to any of the preceding claims, wherein a maximum diameter of the implant ( 1 ) is located in the cortical portion ( 2 ).

Claim 10

Dependent Claim 30 words

6 . A screw implant ( 1 ) according to any of the preceding claims, wherein the cortical portion ( 2 ) has the shape of a truncated regular cone.

Claim 11

Dependent Claim 26 words

7 . A screw implant ( 1 ) according to any of the preceding claims, wherein said angle (α) is in the range 0.5 to 5°.

Claim 12

Dependent Claim 25 words

8 . A screw implant ( 1 ) according to any of the preceding claims, wherein said angle (α) is less than less than 3°.

Claim 13

Dependent Claim 26 words

9 . A screw implant ( 1 ) according to any of the preceding claims, wherein said angle (α) is in the range 0.5 to 3°.

Claim 14

Dependent Claim 26 words

10 . A screw implant ( 1 ) according to any of the preceding claims, wherein said angle (α) is in the range 1 to 2°.

Claim 15

Dependent Claim 31 words

11 . A screw implant ( 1 ) according to any of the preceding claims, wherein the axial length of the cortical portion ( 2 ) is equal to 3 mm.

Claim 16

Dependent Claim 33 words

12 . A screw implant ( 1 ) according to any of claims 1 to 10 , wherein the axial length of the cortical portion ( 2 ) is less than 3 mm.

Claim 17

Dependent Claim 34 words

13 . A screw implant according to any of the claims 1 to 10 , wherein the axial length of the cortical portion ( 2 ) is in the range 0.5 to 1.5 mm.

Claim 18

Dependent Claim 61 words

14 . A screw implant ( 1 ) according to any of the preceding claims, wherein said cancellous portion ( 3 ) is provided with a threaded outer surface that merges with said threaded outer surface of the cortical portion ( 2 ), such that both threaded outer surfaces are engagable in a common inner threaded surface of the bore hole.

Claim 19

Dependent Claim 22 words

15 . A screw implant ( 1 ) according to claim 14 , wherein both threaded outer surfaces present the same lead.

Claim 20

Dependent Claim 32 words

16 . A screw implant ( 1 ) according to any of the preceding claims, wherein the implant ( 1 ) is provided with at least a first threading ( 11 ).

Claim 21

Dependent Claim 33 words

17 . A screw implant ( 1 ) according to claim 16 in combination with claim 15 or 14 , wherein both threaded surfaces are provided with said first threading ( 11 ).

Claim 22

Dependent Claim 36 words

18 . A screw implant ( 1 ) according to claim 16 or 17 , wherein the full axial length of the cortical portion ( 2 ) is provided with said first threading ( 11 ).

Claim 23

Dependent Claim 28 words

19 . A screw implant ( 1 ) according to any of the claims 16 to 18 , wherein said threading ( 11 ) is a single threading.

Claim 24

Dependent Claim 28 words

20 . A screw implant ( 1 ) according to any of the claims 16 to 18 , wherein said threading ( 11 ) is a multiple threading.

Claim 25

Dependent Claim 28 words

21 . A screw implant ( 1 ) according to any of the claims 16 to 20 , wherein said threading ( 11 ) comprises a screw thread.

Claim 26

Dependent Claim 35 words

22 . A screw implant ( 1 ) according to any of the claims 16 to 21 , wherein said threading ( 11 ) is defining a thread height being no greater than 0.20 mm.

Claim 27

Dependent Claim 36 words

23 . A screw implant ( 1 ) according to any of the claims 16 to 22 , wherein said threading ( 11 ) is defining a thread height in the range 0.02 to 0.15 mm.

Claim 28

Dependent Claim 29 words

24 . A screw implant ( 1 ) according to any of the claims 16 to 23 , wherein said threading ( 11 ) has a rounded outer design.

Claim 29

Dependent Claim 26 words

25 . A screw implant ( 1 ) according to any of the claims 16 to 24 , wherein said threading ( 11 ) is symmetrical.

Claim 30

Dependent Claim 28 words

26 . A screw implant ( 1 ) according to any of the claims 16 to 25 , further being provided with a second threading ( 12 ).

Claim 31

Dependent Claim 47 words

27 . A screw implant ( 1 ) according to claim 26 , wherein the first threading ( 11 ) and the second threading ( 12 ) merge with each other such that both threadings ( 11 , 12 ) are engagable in a common inner thread.

Claim 32

Dependent Claim 31 words

28 . A screw implant ( 1 ) according to claim 26 or 27 , wherein said first and second threading ( 11 , 12 ) are providing the same lead.

Claim 33

Dependent Claim 61 words

29 . A screw implant ( 1 ) according to any of the claims 26 to 28 , wherein a transversal border plane (P 2 ) between the first and second threadings ( 11 , 12 ) is provided below a transversal border plane (P 1 ) between the cortical portion ( 2 ) and the cancellous portion ( 3 ).

Claim 34

Dependent Claim 60 words

30 . A screw implant ( 1 ) according to any of the claims 26 to 28 , wherein a transversal border plane (P 2 ) between the first and second threadings ( 11 , 12 ) is coinciding with transversal border plane (P 1 ) between the cortical portion ( 2 ) and the cancellous portion ( 3 ).

Claim 35

Dependent Claim 31 words

31 . A screw implant ( 1 ) according to any of the preceding claims, wherein the cortical portion ( 2 ) is adapted to hold a superstructure ( 20 ).

Claim 36

Dependent Claim 45 words

32 . A screw implant ( 1 ) according to claim 31 , wherein a blind bore ( 7 ) extends into the implant ( 1 ) from the uppermost end of the cortical portion ( 2 ) for holding a superstructure ( 20 ).

Claim 37

Dependent Claim 22 words

33 . A screw implant ( 1 ) according to claim 32 , said blind bore ( 7 ) being internally threaded.

Claim 38

Dependent Claim 54 words

34 . A screw implant ( 1 ) according to any of the claims 1 to 30 , wherein the implant ( 1 ) is formed integrally with a superstructure provided coronally of said cortical portion ( 2 ), said superstructure protruding from the bone tissue when the implant is in its implanted state.

Claim 39

Dependent Claim 25 words

35 . A screw implant ( 1 ) according to any of the preceding claims, wherein the implant ( 1 ) is a dental implant.

Claim 40

Dependent Claim 42 words

36 . A screw implant ( 1 ) according to any of the preceding claims, wherein said axial length of the cortical portion ( 2 ) is relatively short in relation to the axial length of said cancellous portion ( 3 ).

Claim 41

Dependent Claim 52 words

37 . A screw implant ( 1 ) according to any of the preceding claims, wherein said cortical portion ( 2 ), when being screwed into said bore hole ( 50 ), acts so as to slightly compress cortical bone tissue in essentially radial directions of the cortical portion ( 2 ).

Claim 42

Dependent Claim 131 words

38 . A method of installing an implant ( 1 ) according to any of the preceding claims in a bone, comprising the following steps: forming in said bone a bore hole ( 50 ) having a shape being adapted to the general shape of the implant ( 1 ) but being smaller in diameter, screwing said implant ( 1 ) into the bore hole ( 50 ) by applying an insertion torque to the implant ( 1 ) until the cortical portion ( 2 ) of said implant ( 1 ) meets said bore hole resulting in a distinct rise in the screwing torque needed to turn the implant ( 1 ), which is an indication that the implant ( 1 ) is or is soon to be in place.

Claim 43

Dependent Claim 39 words

39 . A method according to claim 38 , wherein an outer part of said bore hole ( 50 ) is formed so as to correspond to the cancellous portion ( 3 ) of the implant ( 1 ).

Claim 44

Dependent Claim 23 words

40 . A method according to any of the claims 38 and 39 , wherein said bore hole ( 50 ) is cylindrical.

Claim 45

Dependent Claim 32 words

41 . A method according to any of the claims 38 to 40 , wherein said bore hole ( 50 ) is slightly smaller in diameter than the implant ( 1 ).

Claim 46

Dependent Claim 228 words

42 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole ( 50 ) arranged in bone tissue, comprising a screw implant ( 1 ), having a cancellous portion ( 3 ), and a bore hole ( 50 ) having a shape generally corresponding to the outer shape of the implant ( 1 ), wherein said implant ( 1 ) is provided with a cortical portion ( 2 ) having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting an outer surface, being threaded for accomplishing said engagement, and having an outer design such that when being screwed into said bore hole ( 50 ) under action of a screwing torque, said cortical portion ( 2 ) acts so as to increase the compression of cortical bone tissue in essentially radial directions of the implant ( 1 ), resulting in a distinct increase of the screwing torque needed for screwing the implant ( 1 ), which increase is usable as an indication that the implant ( 1 ) is in place or nearly in place in the bore hole ( 50 ).

Claim 47

Dependent Claim 228 words

42 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole ( 50 ) arranged in bone tissue, comprising a screw implant ( 1 ), having a cancellous portion ( 3 ), and a bore hole ( 50 ) having a shape generally corresponding to the outer shape of the implant ( 1 ), wherein said implant ( 1 ) is provided with a cortical portion ( 2 ) having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting an outer surface, being threaded for accomplishing said engagement, and having an outer design such that when being screwed into said bore hole ( 50 ) under action of a screwing torque, said cortical portion ( 2 ) acts so as to increase the compression of cortical bone tissue in essentially radial directions of the implant ( 1 ), resulting in a distinct increase of the screwing torque needed for screwing the implant ( 1 ), which increase is usable as an indication that the implant ( 1 ) is in place or nearly in place in the bore hole ( 50 ).

Claim 48

Dependent Claim 168 words

43 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole ( 50 ) arranged in bone tissue, comprising a screw implant ( 1 ), having a cancellous portion ( 3 ), and a bore hole ( 50 ) having a shape generally corresponding to a shape of the implant ( 1 ), wherein said implant ( 1 ) is provided with a cortical portion ( 2 ) having an axial length, such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (α) of less than 5° in relation to the outer surface of the cancellous portion ( 3 ).

Claim 49

Dependent Claim 168 words

43 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole ( 50 ) arranged in bone tissue, comprising a screw implant ( 1 ), having a cancellous portion ( 3 ), and a bore hole ( 50 ) having a shape generally corresponding to a shape of the implant ( 1 ), wherein said implant ( 1 ) is provided with a cortical portion ( 2 ) having an axial length, such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (α) of less than 5° in relation to the outer surface of the cancellous portion ( 3 ).

Claim 50

Dependent Claim 168 words

44 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole ( 50 ) arranged in bone tissue, comprising a screw implant having a cancellous portion ( 3 ) presenting a cylindrical outer surface, and a bore hole ( 50 ) having a shape generally corresponding to a shape of the implant, wherein said implant ( 1 ) is provided with a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a slight conical taper such that said conical outer surface forms an angle (α) of less than 5° in relation to the cylindrical outer surface of the cancellous portion ( 3 ).

Claim 51

Dependent Claim 168 words

44 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole ( 50 ) arranged in bone tissue, comprising a screw implant having a cancellous portion ( 3 ) presenting a cylindrical outer surface, and a bore hole ( 50 ) having a shape generally corresponding to a shape of the implant, wherein said implant ( 1 ) is provided with a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a slight conical taper such that said conical outer surface forms an angle (α) of less than 5° in relation to the cylindrical outer surface of the cancellous portion ( 3 ).

Claim 52

Dependent Claim 182 words

45 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole arranged in bone tissue, comprising a screw implant ( 1 ) having a lower cylindrical cancellous portion ( 3 ′) and an upper conical cancellous portion ( 3 ) presenting a conical outer surface and a bore hole ( 50 ) having a shape generally corresponding to a shape of the implant, wherein said implant ( 1 ) is provided with a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms an non-zero angle (α) of less than 5° in relation to the outer surface of the conical part of the cancellous portion ( 3 ).

Claim 53

Dependent Claim 182 words

45 . An arrangement for facilitating the insertion of a screw implant ( 1 ) in a bore hole arranged in bone tissue, comprising a screw implant ( 1 ) having a lower cylindrical cancellous portion ( 3 ′) and an upper conical cancellous portion ( 3 ) presenting a conical outer surface and a bore hole ( 50 ) having a shape generally corresponding to a shape of the implant, wherein said implant ( 1 ) is provided with a cortical portion ( 2 ), having an axial length such that, when installed in the bore hole ( 50 ), the engagement of said cortical portion ( 2 ) with the bone tissue will generally be confined to the cortical bone tissue layer ( 52 ), said cortical portion ( 2 ) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms an non-zero angle (α) of less than 5° in relation to the outer surface of the conical part of the cancellous portion ( 3 ).

Claim 54

Dependent Claim 41 words

46 . An arrangement according to any of the claims 42 to 45 , wherein said axial length of said cortical portion ( 2 ) is relatively short in relation to the axial length of said cancellous portion ( 3 ).

Claim 55

Dependent Claim 51 words

47 . A arrangement according to any of the claims 42 to 46 , wherein said cortical portion ( 2 ), when being screwed into said bore hole ( 50 ), acts so as to slightly compress cortical bone tissue in essentially radial directions of the cortical portion ( 2 ).

Implant, arrangement comprising an implant, and method for inserting said implant in bone tissue

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