U.S. patent application number 09/128916 was filed with the patent office on 2001-08-30 for reaming tool for reaming bone canals.
Invention is credited to HARDER, HANS E., MOUSAVI, SEYED-MEHDI, VECSEI, VILMOS.
Application Number | 20010018588 09/128916 |
Document ID | / |
Family ID | 8044143 |
Filed Date | 2001-08-30 |
United States Patent
Application |
20010018588 |
Kind Code |
A1 |
HARDER, HANS E. ; et
al. |
August 30, 2001 |
REAMING TOOL FOR REAMING BONE CANALS
Abstract
A reaming tool for reaming bone canals with a drill head which
is mounted on an elongate flexible shaft which has a diameter
smaller than that of the drill head and which can be connected to a
rotary drive motor, wherein the drill head and shank comprise a
through-bore for a guiding wire wherein the shaft at least over a
part of its length is spiraled in a thread-like manner.
Inventors: |
HARDER, HANS E.;
(PROBSTEIERHAGEN, DE) ; MOUSAVI, SEYED-MEHDI;
(VIENNA, AT) ; VECSEI, VILMOS; (VIENNA,
AT) |
Correspondence
Address: |
LERNER, DAVID, LITTENBERG,
KRUMHOLZ & MENTLIK
600 SOUTH AVENUE WEST
WESTFIELD
NJ
07090
US
|
Family ID: |
8044143 |
Appl. No.: |
09/128916 |
Filed: |
August 4, 1998 |
Current U.S.
Class: |
606/80 |
Current CPC
Class: |
A61B 17/1631 20130101;
B23B 2251/54 20130101; Y10T 408/9097 20150115; B23B 51/0411
20220101; B23B 51/02 20130101; B23B 2251/14 20130101; B23Q 11/0042
20130101; A61B 17/164 20130101 |
Class at
Publication: |
606/80 |
International
Class: |
A61B 017/32 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 4, 1997 |
DE |
297 13 897.9 |
Claims
1. A reaming tool for reaming bone canals with a drill head which
is mounted on an elongate flexible shank which has a diameter
smaller than that of the drill head and which can be connected to a
rotary drive motor, wherein the drill head and shank comprise a
through-bore for a guiding wire, and wherein the shank (14) at
least over a part of its length is spiraled (18) in a thread-like
manner.
2. The reaming tool according to claim 1, wherein the thread tip
(20) is rounded or flattened.
3. The reaming tool according to claim 2, wherein the shank (14) is
of plastic or metal.
Description
[0001] The invention relates to a reaming tool for reaming bone
canals.
[0002] Such reaming tools are applied in tubular bones, for example
with the femur for applying hip joint prosthesis or before driving
in a bone nail for the femur, tibia, humerus, etc. From EP 0 508
710 there is known a reaming tool which consists of a drill head
and an elongate shank which can be connected thereto. The drill
head consists of four teeth arranged at a 90.degree. distance with
a chamfer which furthermore comprises a central through-bore. The
shank which is likewise drilled through has a smaller diameter than
the drill head. The central through-bore of the shank and drill
head serves for accommodating a guiding wire along which the
reaming tool is driven forward.
[0003] From EP 0 440 377 there is further known a reaming tool
which comprises a modified drill head and a shank which is formed
flexibly. With the help of the flexible shank which at the same
time represents a flexible shaft the drill head may also be moved
along an arcuate path, which is required in many cases. For such a
flexible shaft there are various known designs. They must not only
be flexible but also be able to transmit a suitable torque.
[0004] On application the chips removed away from the bone are
conveyed behind the drill head into the intermediate space between
the shank and the canal. With longer drillings it is therefore
necessary to remove the tool from the canal from time to time in
order to remove the chips. In this way the operating time is
drastically increased. If the removal of the chips is not effected
in time, a blockage of chips may occur with a corresponding
blocking up of the drill head by which means an unallowable loading
of the bone may occur, in particular by the developing heat.
[0005] It is therefore the object of the invention to provide a
reaming tool for drilling bone canals with which the removal of
chips is significantly improved.
[0006] This object is achieved by the device of the invention.
[0007] With the reaming tool according to the invention the shank
is at least over a part of its length spiraled in the manner of a
thread. Preferably the spiraling extends over the whole length of
the shank, at least over a length such that the spiraled section is
still located outside the bone when the drill head is in its
furthest driven in position.
[0008] Although the outer diameter of the spiraled shank for
obvious reasons is clearly smaller than the outer diameter of the
drill head it is possible with such a flexible shank to convey a
sufficiently large part of the machined chips to the outside. Under
certain circumstances all temporary removal of the drill head from
the drilled out canal for the purpose of chip removal is done away
with, however at least the number of such procedures is limited to
a minimum.
[0009] In order to prevent damage to the canal walling one
formation of the invention provides for the thread tip to be
flattened or rounded.
[0010] Although it is conceivable to form the shank of metal, it
may be manufactured just as well from plastic.
[0011] One embodiment form of the invention is described in more
detail by way of the drawings.
[0012] FIG. 1 schematically shows a reaming tool according to the
invention.
[0013] FIG. 2 shows a detail of the reaming tool according to FIG.
1.
[0014] In FIG. 1 there is illustrated a reaming tool at 10. It
comprises a drill head 12 which e.g. may be formed according to EP
0 508 710 or according to WO 97/03617. A flexible shank 14 is
connected to the drill head 12. The connection is not shown in
detail. It may be conventional. Preferably there is provided a
releasable connection, so that e.g. a drill head with a changed
diameter can be connected to the shank 14. At the free end of the
shank 14 there is mounted a cylindrical clamping piece 16 for
connecting the shank 14 to the chuck of a rotary tool, in
particular a rotary drive machine, for example an electric or
pneumatic motor.
[0015] As can be recognized from the drawing the shank 14 is
spiraled in a helix-shaped manner as is shown at 18. The spiraling
carried out in a thread-like or corkscrew-like manner is provided
with an adequately deep groove so that in spite of an outer
diameter of the shank 14 which is significantly smaller than that
of the outer diameter of the drill head 12, chips which are
conveyed from the drill head 12 rearwards are transported rearwards
by the spiraling of the shank 14 to the clamping piece 1 which lies
safely outside the bone.
[0016] The shank 14 is of formed of metal or plastic and this being
in a manner such that it can transmit the torque which is required
for the reaming, but at the same time is flexible in order to
function as a type of flexible shaft.
[0017] As becomes clear from FIG. 2 the tip of the threads is
rounded or flattened as is indicated at 20. In this way on
contacting or abutting the walling of the bone canal injuries are
avoided.
[0018] As already previously quoted it is to be understood that the
drill head 12 and the shank 14 comprise a through-bore for guiding
through a guide wire which is not shown.
* * * * *