• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:AT509292A9
    申请号:T0137209
    申请日:2009-09-01
    公开日:2012-01-15
    发明作者:
    申请人:Univ Wien Med；
    IPC主号:
    专利说明:

    - 1 -
    The invention relates to a trephine drill for surgical, in particular dental surgical purposes, comprising a drill shank, a drill bit at least partially formed by a hollow cylinder shell and a cooling device for the drill bit.
    The development of trephine drills goes back to antiquity. Today, these surgical instruments are used for implantation bed preparation and bone removal in augmentation procedures in dental surgery, in bone biopsy specimens, and in the opening of the skull. Due to the high rotational speeds of up to 6000 revolutions per minute, the drills in the tissue can become very hot, which can lead to damage to the surrounding tissue. The main problem with the cooling of trephines is the supply of the coolant at the point of heat generation, which arises primarily at the cutting teeth of the drill. Due to the relatively thin and parallel cylinder wall, which is driven into the bone, it is not possible with the current method of cooling from the outside, to transport the cooling liquid to the cutting edge. This effect is particularly pronounced with larger drilling depths. Likewise, the coolant supply via the cooling window is to be regarded as critical, since the coolant is sprayed on the window wall rather than thrown by the rotation of the drill, than that this can penetrate through the window in the depth.
    The invention now aims to improve the cooling of Trepanbohrern and in particular to ensure efficient cooling targeted at those points of Trepanbohrers that are exposed to a special thermal load.
    In order to achieve this object, according to the invention, the trephine drill of the type mentioned above is developed substantially in such a way that the cooling device has at least one hollow cylindrical cylinder shell of the drill bit, a closed one ···· «- 2 -
    Cross-section comprising cooling channel. By arranging at least one cooling channel in the interior of the hollow cylinder jacket, the coolant can be brought almost directly to the location of the heat development and thereby ensure efficient cooling performance. The course of the cooling channel in the interior of the hollow cylinder jacket can be selected according to the respective requirements, but a preferred development provides that at least a portion of the at least one cooling channel extends in an area of the hollow cylinder jacket adjacent to the cutting end of the drill head. The cooling channels are incorporated into the hollow cylinder shell in such a way that the coolant within the shell is conducted directly and close to the cutting edges of the drill bit. As a result, a constant cooling is guaranteed regardless of the respective drilling depth.
    The fact that the at least one cooling channel according to the invention has a closed cross-section, which means nothing else than that the cooling channel runs · completely inside the hollow cylinder jacket, clogging of the cooling channel can be prevented.
    The cooling power is composed of a plurality of factors, such as the course and the length of the at least one cooling channel and from the per unit time flowing through the cooling passage coolant. To improve the cooling capacity, it is in the erfindungemäßen training without further possible to use a suitably pre-cooled coolant, and in particular water.
    For supplying coolant, the trepan drill has a suitable connection, wherein in this context it is preferably provided that the at least one cooling channel is fed via a feed line formed by a central bore in the drill shaft. From the central supply line, the coolant is subsequently passed through the at least one cooling channel, wherein it is preferably provided for the discharge of the coolant that the at least one cooling channel has an outlet opening passing through the outer surface of the drill bit.
    In view of the high rotational speeds of up to 6000 revolutions per minute, trephine drills must pay particular attention to ensuring that no unbalance occurs. An imbalance can occur in particular due to an uneven mass distribution over the circumference of the hollow cylinder jacket. In order to ensure that the material recesses required for the formation of the cooling channel or the cooling channels do not lead to any imbalance, it is provided according to a preferred development that the cooling channel or the cooling channels is or are designed to be axially symmetrical with respect to the axis of rotation of the trephine drill ,
    As already mentioned, particularly intensive cooling is required with the trepan drill, especially near the cutting edge. For this purpose, it is preferably provided that the at least one cooling channel is widened in the axial direction in a region adjacent to the cutting end of the drill head. By widening the at least one cooling channel in the region in which the greatest heat development occurs, it is ensured that a correspondingly larger surface area is provided, at which a heat exchange with the cooling medium can take place. An increase in the cooling capacity is also achieved by the fact that, as is the case with a particularly preferred development, the at least one cooling channel is formed in a meandering manner in an area adjacent to the cutting end of the drill head.
    Another measure for increasing the cooling capacity is preferably that the at least one cooling channel in a region adjacent to the cutting end of the drill head, in particular extending in the circumferential direction of the Kühlmittelström multiply deflecting internals, in particular the cooling channel in the radial direction passing through wall supports. The repeated diversion of the coolant flow leads to a • • • • • * * · · · · 9 ··························································································. ·····································································································································.
    A particularly advantageous course of the at least one cooling channel results according to a preferred development in that the at least one cooling channel is substantially U-shaped, wherein the portion of the cooling channel connecting the two U-legs is designed for multiple deflection of the coolant flow. The two U-legs form a very direct and short to or. Discharge way, so that the coolant is supplied without detour of the most critical zone in the cutting edge near, in which in the two U-leg connecting section a multiple deflection of the coolant flow and thereby a particularly intense heat exchange takes place. Such a design is particularly advantageous when a plurality of such U-shaped extending cooling channels and in particular two with respect to the axis of rotation of the trephine diametrically opposite cooling channels are provided, both fed by the central supply line and each having a separate outlet opening.
    However, two or more cooling channel sections formed with multiple redirection of the coolant can also be interconnected, and in this context the design is such that the at least one cooling channel has at least two regions with multiple redirections of the coolant through a cooling channel section extending in the circumferential direction connected to each other.
    As is known per se, the hollow cylinder jacket may preferably have at least one window. Such a window leads to an internal ventilation of the drill head by ambient air. Such a window is preferably formed in a peripheral region of the hollow cylinder wall that is free of cooling channels.
    In principle, it is possible to allow the cooling medium leaving the at least one cooling channel to escape freely via the outlet opening. However, the escaping cooling medium forms a coolant mist due to the high rotational speed, which can hinder the free view to the place of use. It is therefore preferably provided that the outlet opening is engaged by a collecting device for the coolant. In a structurally particularly simple manner, it may be preferable to provide that the collecting device is formed by a collecting cap surrounding or encompassing the hollow cylinder jacket in the area of the outlet opening.
    The invention will be explained in more detail with reference to embodiments shown schematically in the drawing. 2 shows a view of the trephine drill according to the arrow II of FIG. 1, FIG. 3 shows a section according to the line III / III of FIG. 2, FIG. 4 shows a section along line IV / IV of FIG. 2, FIG. 5 shows a view of the trephine drill in which the outer jacket has been removed, FIG. 6 shows a view of the cooling channel, FIG. 7 shows a perspective view of a trephine drill in a modified embodiment, 8 shows a view of the trephine drill according to FIG. 7, in which the outer casing has been removed, FIG. 9 shows the cooling channel of the trephine drill according to FIGS. 7 and 8, FIG. 10 shows a cooling channel in a modified embodiment, FIG Trepanbohrers with collecting cap and Fig.12 the Tepanbohrer according to Fig.ll in a perspective view.
    In Fig.l an inventive trepan drill 1 is shown, which has a drill shank 2 and a drill bit 3 with cutting teeth 4. The drill bit 3 is in this case formed by a hollow cylinder, whose hollow cylinder shell is denoted by 5. Upon rotation of the trephine drill about the axis of rotation 6, the cutting teeth 4 produce an annular cut, wherein the core is received in the interior of the hollow cylinder jacket 5. The trephine drill has two inside the hollow * φ • * - 6 -
    Cylinder jacket extending cooling channels, which are fed via a central bore 7 in the drill shank 2. The outlet opening of one of the two cooling channels is denoted by 15. In Fig.l is further seen that the drill bit 3 has two windows 9.
    The drill shank 2 has at its free end a coupling flange 10, on which engages a not shown in more detail rotary drive.
    In the view according to Figure 2 it can be seen that the supply line for the cooling channels is formed by a central bore in the drill shank 2. As can be seen in particular in the sectional view of Figure 3, the feed line 7 opens into two cooling channels 11, the first inside a conical portion of the drill bit 3 and subsequently in the interior of the hollow cylinder jacket 5 in the direction of the cutting teeth 4 having end portion run. In the area adjacent to the cutting end of the cooling channel 11, the coolant is deflected in the circumferential direction and enters a relatively wide region of the cooling channel, in which the coolant is deflected several times. For the purpose of diversion, the cooling channel 11 in this cooling region on several, the cooling channel 11 radially passing through wall supports 12, which extend from the outer wall 13 to the inner wall 14 of the hollow cylinder jacket. In the sectional view according to Figure 4, that portion of the cooling channels 11 can be seen, via which the discharge of the coolant takes place. The cooling channels have for this purpose in each case a the outer surface of the drill bit 3 passing through the outlet opening 15.
    The design of the cooling channel can be seen particularly clearly in Figure 5, in which the outer wall 13 of the hollow cylinder shell 5 is not shown for clarity. It can be seen that the cooling channel 11 is formed substantially U-shaped, wherein the two U-legs connecting portion of the cooling channel 11 has the cooling passage radially passing through wall supports 12 for multiple deflection of the coolant flow.
    The production of the trephine drill is carried out in such a way that initially the basic body shown in FIG. 5 is produced, into which the cooling channel 11 is machined and, in particular, milled. Finally, a sleeve, which forms the outer wall 13 of the hollow cylinder jacket 5 in the sequence, pulled over the main body shown in Figure 5 and finished in a suitable manner. As an alternative to the described production by means of CNC milling, the implementation can also be carried out with the new technology of laser metal melting (SLM, Selective Laser Melting).
    In Figure 6, the cooling channels are shown alone and it can be seen that both cooling channels 11 are fed by the common supply line 7. The coolant outlet takes place via the two outlet ends 15.
    FIG. 7 shows an alternative embodiment in which the coolant outlet takes place via an outlet opening on the conical part of the drill head 3. The discharge of the coolant thus takes place in the direction of the axis of rotation 6 to the rear. The resulting modified course of the coolant channel 11 is clear in Fig.8. In Figure 9, the course of the coolant channels 11 is even better visible.
    Fig.10 shows a modified embodiment of the cooling channel. In turn, a central supply line 7 is provided, which opens into a cooling channel 16. The cooling passage 16 includes a circumferentially extending cooling passage portion connecting two portions 17 with multiple deflections of the coolant. The outlet of the coolant is again via an outlet opening 15th
    In the embodiment according to FIG. 11, the trephine drill carries a collecting cap 18 which, between itself and the conical section 8 of the drill head 3, forms an annular catcher for the coolant emerging via the outlet opening 15. The coolant collecting in the annular space 20 can be discharged via the discharge line 19. For example, a flexible hose, which supplies the coolant to a coolant tank, can be attached to the discharge line 19.
    In the perspective view of Figure 12, the shape of the cap is better visible. The collecting cap 18 may preferably consist of a rigid material, such as stainless steel, and must be freely rotatable relative to the drill.
    权利要求:
    Claims (14)
    [1]
    * · · · · · · · · · · · · · · · · · · ······································································································································ Patent claims a drill shaft, a drill bit at least partially formed by a hollow cylinder shell and a cooling device for the drill bit, characterized in that the cooling device comprises at least one in the hollow cylinder jacket (5) of the drill bit (3) extending, a closed cross-section cooling channel (11).
    [2]
    2. trepan drill according to claim 1, characterized in that at least a portion (17) of the at least one cooling channel (11) in a cutting end of the drill head (3) adjacent region of the hollow cylinder shell (5).
    [3]
    3. Trepan drill according to claim 1 or 2, characterized in that the at least one cooling channel (11) via one of a central bore (7) in the drill shank (2) formed supply line is fed.
    [4]
    4. Trepan drill according to claim 1, 2 or 3, characterized in that the at least one cooling channel (11) has an outer surface of the drill bit (3) passing through the outlet opening (15).
    [5]
    5. trepan drill according to one of claims 1 to 4, characterized in that the cooling channel (11) or the cooling channels (11) with respect to the axis of rotation (6) of the trephine drill (1) is formed axially symmetrically or are.
    [6]
    6. Trepan drill according to one of claims 1 to 5, characterized in that the at least one cooling channel (11) in a cutting end of the drill head (3) adjacent area is widened in the axial direction.
    [7]
    7. trepan drill according to one of claims 1 to 6, characterized in that the at least one cooling channel (11) is formed in a meandering manner in a region adjacent to the cutting end of the drill head (3).
    [8]
    8. trepan drill according to one of claims 1 to 7, characterized in that the at least one cooling channel (11) in a the cutting end of the drill head (3) adjacent, in particular extending in the circumferential direction region (17) the Kühlmittelström multiply deflecting internals, in particular the Cooling channel (11) in the radial direction passing through wall supports (12).
    [9]
    9. trepan drill according to one of claims 1 to 8, characterized in that the at least one cooling channel (11) is formed substantially U-shaped extending, wherein the two U-leg connecting portion (17) of the cooling channel (11) for multiple Deflection of the coolant flow is formed.
    [10]
    10. Trepanbohrer according to one of claims 1 to 9, characterized in that the at least one cooling channel (11) has at least two regions (17) with multiple deflection of the coolant, which are interconnected by a running in the circumferential direction of the cooling duct section.
    [11]
    11. trepan drill according to one of claims 1 to 10, characterized in that the hollow cylinder jacket (5) has at least one window (9).
    [12]
    12. Trepanbohrer according to claim 11, characterized in that the at least one window (9) in one of cooling channels (11) free circumferential region of the hollow cylinder wall (5) is formed. Μ · · * | * * * * * * * * * * * * * * * * * * «« «* *« «« I '································································
    [13]
    13. Trepanbohrer according to one of claims 4 to 12, characterized in that the outlet opening (15) is overlapped by a collecting device for the coolant.
    [14]
    14, Trepanbohrer according to claim 13, characterized in that the collecting device of a hollow cylinder jacket (5) in the region of the outlet opening (15) surrounding or encompassing collecting cap (18) is formed. Vienna, on the 1st of September 2009

    ti AKeschmann Medical Universi Vienna by: Haffne, "Sntakw & lLtfe OG
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    同族专利:
    公开号 | 公开日
    AT509292B1|2012-01-15|
    AT509292A1|2011-07-15|
    WO2011026164A1|2011-03-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3202193A1|1982-01-25|1983-08-04|Merck Patent Gmbh, 6100 Darmstadt|SURGICAL BONE GRINDING INSTRUMENT|
    EP0373111A2|1988-12-02|1990-06-13|Institut Straumann Ag|Device for treating a bone, especially a jaw bone and/or a tooth|
    GB1104798A|1963-11-22|1968-02-28|English Electric Co Ltd|Trepanning tools|
    US3244035A|1965-09-21|1966-04-05|Ex Cell O Corp|Trepanning drill tool|
    US4538944A|1981-09-21|1985-09-03|Hougen Everett D|Annular cutter|
    JPH0690547A|1992-07-21|1994-03-29|Fuji Electric Co Ltd|Ventilating and cooling device for salient-pole type rotary electric machine|
    US6193722B1|1998-09-29|2001-02-27|Sulzer Orthopaedic Ag|Hollow milling tool|
    US20090274996A1|2008-05-05|2009-11-05|Kenneth Miller|Bone cutting device and method of using same|
    GB2463522B|2008-09-17|2013-03-27|Martin Philcox|Controlled feed surgical reamer|DE202012013626U1|2012-09-26|2018-10-01|Ralf Masur|Hollow milling machine for dental purposes|
    DE102012020370A1|2012-09-26|2014-03-27|Ralf Masur|Hollow milling machine for dental purposes|
    DE102014203448A1|2014-02-26|2015-08-27|Gebr. Brasseler Gmbh & Co. Kg|Method for producing a dental instrument or medical instrument|
    DE102014203458A1|2014-02-26|2015-09-10|Gebr. Brasseler Gmbh & Co. Kg|Method for producing a medical instrument by means of an additive method|
    DE102014208134A1|2014-04-30|2015-11-05|MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG|drill|
    WO2015166068A1|2014-04-30|2015-11-05|MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG|Tool produced by means of a laser sintering method|
    EP3197624A1|2014-09-23|2017-08-02|Danske Vaerktoej ApS|Thread cutting tap|
    CN105686860A|2016-03-22|2016-06-22|威海威高洁丽康生物材料有限公司|Detachable automatic-centering-type annular bone taking drill|
    US10258362B2|2016-07-12|2019-04-16|Ethicon Llc|Ultrasonic surgical instrument with AD HOC formed blade|
    CN106264654A|2016-09-23|2017-01-04|武汉多可特医疗器械有限公司|A kind of craniotome head being built-in with heat sink|
    CN106308879A|2016-09-23|2017-01-11|武汉多可特医疗器械有限公司|Craniotomy milling device with built-in cooling water channel|
    DE102016120755A1|2016-10-31|2018-05-03|Frank Zastrow|Surgical instrument|
    DE102017104188A1|2017-02-28|2018-08-30|Cl Schutzrechtsverwaltungs Gmbh|Method for producing a medical component|
    法律状态:
    2015-05-15| MM01| Lapse because of not paying annual fees|Effective date: 20140901 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT0137209A|AT509292B1|2009-09-01|2009-09-01|Trepan|AT0137209A| AT509292B1|2009-09-01|2009-09-01|Trepan|
    PCT/AT2010/000315| WO2011026164A1|2009-09-01|2010-09-01|Trepan drill|
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