CA2136652C - Fixation pin for small-bone fragments - Google Patents
Fixation pin for small-bone fragments Download PDFInfo
- Publication number
- CA2136652C CA2136652C CA002136652A CA2136652A CA2136652C CA 2136652 C CA2136652 C CA 2136652C CA 002136652 A CA002136652 A CA 002136652A CA 2136652 A CA2136652 A CA 2136652A CA 2136652 C CA2136652 C CA 2136652C
- Authority
- CA
- Canada
- Prior art keywords
- support disk
- pin
- combination
- threaded portion
- bone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
- Prostheses (AREA)
- Materials For Medical Uses (AREA)
Abstract
The invention relates to a fixation pin for fixing small bone fragments to larger bone fragments in osteosynthesis procedures, the fixation pin consisting of a smooth-walled shank part and an adjoining threaded part, and the transition between shank part and threaded part being of conical development; furthermore, a support disk can be connected to the fixation pin, the conical step of the fixation pin being inserted into a correspondingly developed recess in the support disk and the support disk being developed slightly concave.
Description
~I366~~
TRANSLATION
from:
FIXATION PIN
The present invention relates to a fixation pin for osteosynthesis procedures.
In osteosynthesis it is generally known to fix bone fragments by screws or nails. In the case of small bone splinters, however, the screws or nails available in the prior art are much too large to fix these small splinter particles on the main bone without damage. The fixing of these bone fragments by means of simple pins and nails is problematical since the bone particle can slide on the outer wall of the pin or nail since it is not held by an abutment.
Fixation pins are known from European Patent 314 021 A2 or, for instance, from Federal Republic of Germany 32 44 819 A1, but their object is to fasten the fixator externally on the bone fragments. In these known fixation pins, the transition from the threaded part to the shank part is developed as a linear step and the fixing of the bone fragments to one another is effected not by the fixation pin but by an external fixator which is held in place via the fixation pin.
If a small fixation pin for the fixing of small bone fragments would also be provided with a linear step, then upon the screwing in of the fixation pin, this step would first come into contact with the bone fragment at a LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 11 BROADWAY, NEW YORK, NY 10004 Fax: (212) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
circumferential place and thereby shift the bone fragment due to the rubbing produced.
In contrast to this, the object of the invention is to provide a fixation pin for bone fragments which, despite its smallness, effects a dependable fixing to the main bone of the bone fragment which has split off.
The invention provides in combination, a fixation pin for fastening a small broken bone fragment to a main remaining part of the same bone, said fixation pin comprising a smooth-walled shank portion, said pin having a threaded portion of reduced diameter connected to said shank portion via a transitional formation, said threaded portion having a sharp distal end that is self-tapping in bone tissue, and a washer having a bore sized for free reception of said threaded portion and for seating at said transitional formation, said support disk having an outer diameter greater than the diameter of said shank portion, and said support disk having a distal face for relatively large-area contact with a bone fragment when the distal end of said threaded portion is otherwise fully engaged to said main bone part via said bone fragment.
The shank part is contained within the surrounding muscular tissue and can easily be cut to length by a suitable tool when the shank part consists of a material which permits such cutting.
The threaded part of the fixation pin is preferably provided with a fine-pitch thread so that a sensitive, precise screwing in of the pin is possible.
The disk can lie with a large surface on top of the bone to be fixed. In this connection, the support disk can also be used for simultaneously fixing several bone splinters.
In this connection, the support disk has, preferably centrally, a hole of a diameter which is larger than the outside diameter of the threaded part and smaller than the outside diameter of the shank part, the shape of the hole being furthermore adapted to the conical shape of the step.
However, it is also possible for the support disk to have, within the hole, a thread which can engage with the thread of the threaded part of the fixation pin so that in this way the support disk can be screwed on the threaded part of the fixation pin.
TRANSLATION
from:
FIXATION PIN
The present invention relates to a fixation pin for osteosynthesis procedures.
In osteosynthesis it is generally known to fix bone fragments by screws or nails. In the case of small bone splinters, however, the screws or nails available in the prior art are much too large to fix these small splinter particles on the main bone without damage. The fixing of these bone fragments by means of simple pins and nails is problematical since the bone particle can slide on the outer wall of the pin or nail since it is not held by an abutment.
Fixation pins are known from European Patent 314 021 A2 or, for instance, from Federal Republic of Germany 32 44 819 A1, but their object is to fasten the fixator externally on the bone fragments. In these known fixation pins, the transition from the threaded part to the shank part is developed as a linear step and the fixing of the bone fragments to one another is effected not by the fixation pin but by an external fixator which is held in place via the fixation pin.
If a small fixation pin for the fixing of small bone fragments would also be provided with a linear step, then upon the screwing in of the fixation pin, this step would first come into contact with the bone fragment at a LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 11 BROADWAY, NEW YORK, NY 10004 Fax: (212) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
circumferential place and thereby shift the bone fragment due to the rubbing produced.
In contrast to this, the object of the invention is to provide a fixation pin for bone fragments which, despite its smallness, effects a dependable fixing to the main bone of the bone fragment which has split off.
The invention provides in combination, a fixation pin for fastening a small broken bone fragment to a main remaining part of the same bone, said fixation pin comprising a smooth-walled shank portion, said pin having a threaded portion of reduced diameter connected to said shank portion via a transitional formation, said threaded portion having a sharp distal end that is self-tapping in bone tissue, and a washer having a bore sized for free reception of said threaded portion and for seating at said transitional formation, said support disk having an outer diameter greater than the diameter of said shank portion, and said support disk having a distal face for relatively large-area contact with a bone fragment when the distal end of said threaded portion is otherwise fully engaged to said main bone part via said bone fragment.
The shank part is contained within the surrounding muscular tissue and can easily be cut to length by a suitable tool when the shank part consists of a material which permits such cutting.
The threaded part of the fixation pin is preferably provided with a fine-pitch thread so that a sensitive, precise screwing in of the pin is possible.
The disk can lie with a large surface on top of the bone to be fixed. In this connection, the support disk can also be used for simultaneously fixing several bone splinters.
In this connection, the support disk has, preferably centrally, a hole of a diameter which is larger than the outside diameter of the threaded part and smaller than the outside diameter of the shank part, the shape of the hole being furthermore adapted to the conical shape of the step.
However, it is also possible for the support disk to have, within the hole, a thread which can engage with the thread of the threaded part of the fixation pin so that in this way the support disk can be screwed on the threaded part of the fixation pin.
TRANSLATION _ 4 _ from:
Embodiments of the invention will be explained below with reference to the drawing, in which:
Fig. 1 shows, on a larger scale, a fixation pin in accordance with the invention;
Fig. 2 shows an example of the use of the fixation pin;
Fig. 3 shows a fixation pin with support disk placed thereon; and fig. 4 shows the support disk without fixation pin.
The drawings show a fixation pin 1 which consists essentially of a smooth-walled shank part 2, adjoining which there is a threaded part 3, the outside diameter of this threaded part 3 being smaller than the outside diameter of the shank part 2. Between the threaded part 3 and the shank part there is in this way developed a conical step 4 which, on the one hand, serves as abutment for the bone fragment B_ held by the threaded part against the main bone A but, on the other hand, is able to penetrate slightly into the bone fragment B_.
In order to give an idea of the order of magnitude, it is pointed out that such a fixation pin 1 can, for instance, have a length of 100 mm, the threaded part 3 having a length of 15 mm and the shank part 2 a length of 85 mm. The diameter of the threaded part can be 1.6 mm when the diameter of the shank part 2 is 2 mm, or if the diameter of the shank part is 1.6 mm then the threaded part has a diameter of 1.2 LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 11 BROADWAY, NEW YORK, NY I(?004 Fax: (212) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
~1~6~~~
~V TRANSLATION
_ from:
mm.
Of course, larger diameters of the shank part and of the threaded part are also possible.
The thread of the threaded part can preferably be developed as a fine-pitch thread so that even small bone splinters can be fastened with it. In this connection, the thread is, of course, preferably of self-tapping type.
The shank part can easily be cut by suitable pliers so that protruding regions can easily be removed.
Fig. 3 shows a fixation pin which bears a support disk 5. This support disk 5 has a -- preferably central -- hole 6 through which the threaded part 3 of the fixation pin 1 can engage, the support disk 5 being then fixed to the step 4 of the fixation pin 1.
In order to obtain a reliable and good fixation, the hole 6 is developed in a manner which is in accord with the conical development of the step 4, so that the step 4 rests snugly in the hole.
In this connection, the support disk 5 is slightly arched and its concave side is directed towards the bone to be fixed in position, the edges 7 of the support disk 5 being preferably also rounded so that no sharp edges which might result in injuries are present. In this connection, it is possible to maintain support disks of different size and different convexity in stock.
LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 I 1 BROADWAY, NEW YORK, NY 10004 Fax: (2l2) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
2~3~~~2 TRANSLATION _ 6 _ from:
While in the embodiment shown in Figs. 3 and 4, the support disk 5 can slide freely on the threaded part and adapts itself only via a corresponding conical recess to the conical support step, it is also possible, in practice, for the support disk to have within the region of the hole an internal thread which is adapted to the external thread of the threaded part of the fixation pin so that, in this way, the support disk can be screwed onto the threaded part of the fixation pin.
LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 I I BROADWAY, NEW YORK, NY 10004 Fax: (212) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
Embodiments of the invention will be explained below with reference to the drawing, in which:
Fig. 1 shows, on a larger scale, a fixation pin in accordance with the invention;
Fig. 2 shows an example of the use of the fixation pin;
Fig. 3 shows a fixation pin with support disk placed thereon; and fig. 4 shows the support disk without fixation pin.
The drawings show a fixation pin 1 which consists essentially of a smooth-walled shank part 2, adjoining which there is a threaded part 3, the outside diameter of this threaded part 3 being smaller than the outside diameter of the shank part 2. Between the threaded part 3 and the shank part there is in this way developed a conical step 4 which, on the one hand, serves as abutment for the bone fragment B_ held by the threaded part against the main bone A but, on the other hand, is able to penetrate slightly into the bone fragment B_.
In order to give an idea of the order of magnitude, it is pointed out that such a fixation pin 1 can, for instance, have a length of 100 mm, the threaded part 3 having a length of 15 mm and the shank part 2 a length of 85 mm. The diameter of the threaded part can be 1.6 mm when the diameter of the shank part 2 is 2 mm, or if the diameter of the shank part is 1.6 mm then the threaded part has a diameter of 1.2 LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 11 BROADWAY, NEW YORK, NY I(?004 Fax: (212) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
~1~6~~~
~V TRANSLATION
_ from:
mm.
Of course, larger diameters of the shank part and of the threaded part are also possible.
The thread of the threaded part can preferably be developed as a fine-pitch thread so that even small bone splinters can be fastened with it. In this connection, the thread is, of course, preferably of self-tapping type.
The shank part can easily be cut by suitable pliers so that protruding regions can easily be removed.
Fig. 3 shows a fixation pin which bears a support disk 5. This support disk 5 has a -- preferably central -- hole 6 through which the threaded part 3 of the fixation pin 1 can engage, the support disk 5 being then fixed to the step 4 of the fixation pin 1.
In order to obtain a reliable and good fixation, the hole 6 is developed in a manner which is in accord with the conical development of the step 4, so that the step 4 rests snugly in the hole.
In this connection, the support disk 5 is slightly arched and its concave side is directed towards the bone to be fixed in position, the edges 7 of the support disk 5 being preferably also rounded so that no sharp edges which might result in injuries are present. In this connection, it is possible to maintain support disks of different size and different convexity in stock.
LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 I 1 BROADWAY, NEW YORK, NY 10004 Fax: (2l2) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
2~3~~~2 TRANSLATION _ 6 _ from:
While in the embodiment shown in Figs. 3 and 4, the support disk 5 can slide freely on the threaded part and adapts itself only via a corresponding conical recess to the conical support step, it is also possible, in practice, for the support disk to have within the region of the hole an internal thread which is adapted to the external thread of the threaded part of the fixation pin so that, in this way, the support disk can be screwed onto the threaded part of the fixation pin.
LAWYERS' AND MERCHANTS' TRANSLATION BUREAU INC.
Legal, Financial, Scientific, Technical and Patent Translations Tel: (212) 344-2930/2931 I I BROADWAY, NEW YORK, NY 10004 Fax: (212) 422-6877 Consultant Founded in 1903 by WM. BERTSCHE, J.D., CH.E., A.C.S. CARL V. BERTSCHE
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In combination, a fixation pin for fastening a small broken bone fragment to a main remaining part of the same bone, said fixation pin comprising a smooth-walled shank portion, said pin having a threaded portion of reduced diameter connected to said shank portion via a transitional formation, said threaded portion having a sharp distal end that is self-tapping in bone tissue, and a support disk having a bore sized for free reception of said threaded portion and for seating at said transitional formation, said support disk having an outer diameter greater than the diameter of said shank portion, and said support disk having a distal face for relatively large-area contact with a bone fragment when the distal end of said threaded portion is otherwise fully engaged to said main bone part via said bone fragment.
2. The combination of claim 1 wherein the threaded portion of the pin has a fine-pitch thread.
3. The combination of claim 1 or claim 2 wherein at least the shank portion of the pin is of a material which permits cutting to length of the pin by cutting pliers.
4. The combination of any one of claims 1 to 3 wherein the outside diameter of the threaded portion is between 70%
and 80% of the outside diameter of the shank portion.
and 80% of the outside diameter of the shank portion.
5. The combination of any one of claims 1 to 4 wherein said transitional formation is conically shaped, and wherein said support disk has a bore that is shaped for engagement by said transitional formation.
6. The combination of any one of claims 1 to 5 wherein said support disk is arched concavely in the direction of said threaded portion of the pin.
7. The combination of any one of claims 1 to 6 wherein said support disk has rounded outer edges.
8. The combination of any one of claims 1 to 4 wherein said support disk includes an internal screwthread that is sized for engagement with said threaded portion of the pin.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4309707 | 1993-03-25 | ||
| DEP4309707.3 | 1993-03-25 | ||
| DE4406374A DE4406374C2 (en) | 1993-03-25 | 1994-02-26 | Fixation pin for osteosynthesis work |
| DEP4406374.1 | 1994-02-26 | ||
| PCT/DE1994/000323 WO1994021184A1 (en) | 1993-03-25 | 1994-03-19 | Fixing pin for osteosynthesis |
| CA002120566A CA2120566A1 (en) | 1993-03-25 | 1994-04-05 | Fixation pin for small-bone fragments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2136652A1 CA2136652A1 (en) | 1994-09-29 |
| CA2136652C true CA2136652C (en) | 2000-08-22 |
Family
ID=27169740
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002136652A Expired - Lifetime CA2136652C (en) | 1993-03-25 | 1994-03-19 | Fixation pin for small-bone fragments |
| CA002120566A Abandoned CA2120566A1 (en) | 1993-03-25 | 1994-04-05 | Fixation pin for small-bone fragments |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002120566A Abandoned CA2120566A1 (en) | 1993-03-25 | 1994-04-05 | Fixation pin for small-bone fragments |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0642323B1 (en) |
| JP (1) | JP3387924B2 (en) |
| AT (1) | ATE177000T1 (en) |
| CA (2) | CA2136652C (en) |
| DK (1) | DK0642323T3 (en) |
| ES (1) | ES2128558T3 (en) |
| GR (1) | GR3029702T3 (en) |
| WO (1) | WO1994021184A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2499400A1 (en) * | 1981-02-06 | 1982-08-13 | Tornier Sa | Fixing device for compound fracture - comprises planar element with depressions receiving spherical joints to support bone fixing pins |
| CH681957A5 (en) * | 1988-11-17 | 1993-06-30 | Synthes Ag | |
| FR2649310B1 (en) * | 1989-07-04 | 1997-12-19 | Kapandji Adalbert | INTRA-FOCAL PIN WITH REDUCING EFFECT FOR FRACTURE OSTEOSYNTHESIS |
| IT1237496B (en) * | 1989-10-26 | 1993-06-08 | Giuseppe Vrespa | SCREW DEVICE FOR ANCHORING BONE PROSTHESES, METHOD FOR THE APPLICATION OF SUCH DEVICE AND RELATED EQUIPMENT |
| FR2683446A1 (en) * | 1991-11-08 | 1993-05-14 | Hardy Jean Marie | MODULAR EXTERNAL FIXER FOR IMMOBILIZING A FRACTURE FIREPLACE. |
-
1994
- 1994-03-19 AT AT94911063T patent/ATE177000T1/en active
- 1994-03-19 ES ES94911063T patent/ES2128558T3/en not_active Expired - Lifetime
- 1994-03-19 JP JP52052994A patent/JP3387924B2/en not_active Expired - Lifetime
- 1994-03-19 CA CA002136652A patent/CA2136652C/en not_active Expired - Lifetime
- 1994-03-19 EP EP94911063A patent/EP0642323B1/en not_active Expired - Lifetime
- 1994-03-19 DK DK94911063T patent/DK0642323T3/en active
- 1994-03-19 WO PCT/DE1994/000323 patent/WO1994021184A1/en active IP Right Grant
- 1994-04-05 CA CA002120566A patent/CA2120566A1/en not_active Abandoned
-
1999
- 1999-03-16 GR GR990400786T patent/GR3029702T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2120566A1 (en) | 1995-10-06 |
| WO1994021184A1 (en) | 1994-09-29 |
| JPH07507476A (en) | 1995-08-24 |
| CA2136652A1 (en) | 1994-09-29 |
| EP0642323A1 (en) | 1995-03-15 |
| DK0642323T3 (en) | 1999-10-04 |
| JP3387924B2 (en) | 2003-03-17 |
| ES2128558T3 (en) | 1999-05-16 |
| ATE177000T1 (en) | 1999-03-15 |
| GR3029702T3 (en) | 1999-06-30 |
| EP0642323B1 (en) | 1999-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20140319 |