CN101642382B - Drill bit - Google Patents
Drill bit Download PDFInfo
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- CN101642382B CN101642382B CN200910139683.8A CN200910139683A CN101642382B CN 101642382 B CN101642382 B CN 101642382B CN 200910139683 A CN200910139683 A CN 200910139683A CN 101642382 B CN101642382 B CN 101642382B
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- drill bit
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Abstract
A drill bit comprises the following components: a shaft having a drilling end defining a drill point; at least one face that extends to and helps define the drill point, the or each face generally subtending an acute angle with a longitudinal axis of the shaft; and at least one flute defined in the shaft for directing away debris produced during drilling.
Description
The application is that application is artificial: Surgibit IP Holdings Pty Ltd. (AU), international filing date is: on August 7th, 2003, priority date is on August 8th, 2002 the earliest, international application no is PCT/AU03/01003, national applications number is: 03822503.4, and name is called: drill bit and the dividing an application of invention of manufacturing the method for drill bit.
Invention field
The present invention relates to a kind of drill bit and manufacture the method for drill bit, particularly relate to, but be not limited to the drill bit of drilling skeleton, cartilage or other similar structures in plastic operation.
Background of invention
It is known adopting drill bit in plastic operation.But, when drilling skeleton and cartilage, there is a problem in the shaping drill bit.Particularly, skeleton has the cover layer that is referred to as periosteum, and it has smooth characteristics.When drilling, particularly, in difficult surgical operation, be well known that drill bit can slip away on periosteum, cause potentially the damage of periosteum and skeleton, and adjacent body part, comprise the damage of muscle, tendon, skin, organ etc.
Summary of the invention
According to a first aspect of the invention, provide a kind of drill bit, comprising:
One bar section, have the tapering point that limits bit point of the drill, and bit point of the drill is with many edges that limit taper (pyramidal); And
The groove of one or more chips that produce during for the carrying-off drilling, this groove or each groove have the first of extending along bar section and the second portion extended along bit point of the drill, and wherein the second portion of this groove or each groove extends along the edge of bit point of the drill.
Preferably, each edge limited cut edge, and preferably locate this groove or each groove further to limit cut edge.
Preferably, each edge extends to the far point of bit point of the drill from bar section.
By adopting cut edge, bit point of the drill can produce a safety vent that makes the drill bit secure localization fast, thereby while preventing from starting drilling, drill bit is removed from material surface.
Preferably, the degree of depth of the second portion of each groove varies along its length with respect to the surface of bit point of the drill, and the cutting power at the edge of contiguous like this drilling point is less than the cutting power at the edge of contiguous bar section.
Due to the cutting power of the cut edge that has reduced contiguous drilling point, drill bit frangibility not when starting to cut.This is because the material that the edge of contiguous drilling point can be difficult for being entered by drilling is locked.
Preferably, the first of groove or each groove is spiral type substantially, and the second portion of groove or each groove is linear substantially.
Preferably, bit point of the drill comprises at least three edges, this is edge limited bit point of the drill taper.
Preferably, at least extend three corresponding surfaces between three edges.Before forming groove or each groove, with respect to bit face, can be flat (plane) or be spill.
Preferably, the second portion of groove or each groove is along a surface extension separately.
Preferably, the edge of bit point of the drill is inclination, thereby increases the cutting power of cut edge.
According to a second aspect of the invention, provide a kind of method of manufacturing drill bit, comprise the following steps:
Form a bar section, this bar section has the tapering point that limits bit point of the drill, and wherein bit point of the drill has many edges that limit taper; And
Form the groove of one or more chips that produce during for the carrying-off drilling, this groove or each groove have the first of extending along bar section and the second portion extended along bit point of the drill, and wherein the second portion of this groove or each groove extends along an edge of bit point of the drill.
Preferably, the step that forms groove or each groove comprises when grinding parts move along bit point of the drill it outwards moved from bit point of the drill, and the degree of depth of the second portion of each groove changes along its length with respect to the surface of bit point of the drill like this.
Preferably, groove or each recess configurations become the edge adjacent to separately, and the cutting power at the edge of contiguous like this drill bit end points is less than the cutting power at the edge of contiguous bar section.
According to a third aspect of the invention we, provide a kind of drill bit, comprising:
Bar section with drilling end, this drilling end limits a drilling point;
At least one end face, this end face extends to drilling and puts and contribute to form this drilling point, and the longitudinal axis of this end face or each end face and bar section roughly is an acute angle; And
At least one is defined in the groove in bar, the chip produced when the drilling for carrying-off, wherein at least one groove and at least one end face intersect, like this from end view, this groove depart from end face middle body.
By making by this way groove depart from, inventor's discovery, for example broken bone bits can break away from and direct away from the drill bit end fast, but but also can form the firm drilling point of secure localization on bone.The inventor observes, and firm drilling point can be exerted all one's strength and be concentrated through periosteum, so that antiskid mechanism to be provided, thus can the quick drill bone.This drilling point bone that also can tentatively puncture then cuts bone when drilling, and the chip that the groove of setting produces during this cutting of carrying-off subsequently fast.
Preferably, groove intersects with mode and the end face that limits a continuous bend in groove-end.
The chip produced when this bending also strengthens and steadily carrying-off bores bone.
Preferred end face or each end face:
(a) be flat, be defined as an inclined-plane;
(b) in crooked or V-arrangement, being recessed into bar section;
(c) there is rib or the V-shaped groove extended along an edge.
Therefore, in the third aspect, when the longitudinal axis of described end face and bar section roughly is an acute angle, for curved end face, this acute angle means by put the imaginary line of drawing to end face and bar section outer surface intersection from drilling.
In (a), being prepared with one or more flat angled end-faces at the drilling end can be fast and accurately form the drilling point, and provides and determine firm drilling dot structure, thereby has extended to greatest extent the life-span of drilling point.At (b) with (c), the shape of end face indent can strengthen its cutting power, even can also further firm drilling point.
Preferably, in (c), groove extends in the end face at a contiguous described edge.
Alternatively, in (c), groove can intersect with V-shaped groove.
The carrying-off of the further like this chip produced while having strengthened drilling.
In a preferred form, be provided with three end faces at the drilling end, each all evenly departs from respect to other two, and each end face diminishes gradually towards drilling point, so that the drilling that presents Rhizoma Sparganii taper end to be provided.Preferably in this respect, groove separately is arranged to intersect with each end face.
In optional form, can be provided with four end faces at the drilling end, each end face evenly departs from respect to end face adjacent on its opposite side, and each end face diminishes gradually towards drilling point, so that the drilling that presents rectangular pyramid shape end to be provided.In this respect, groove separately can be arranged to only with every two end faces, intersect, and at the drilling end, two relative end faces intersect (or also can be provided with groove on each end face).
Although find that three or four end faces are best situation, also can suitably adopt any amount of end face on the drilling end.
Preferably, groove or each groove be away from end face separately spiral extension roughly, and at least along bar section, extend a part.
Usually groove does not extend on the whole length of bar section, thereby for example forms the not part of open channels of bar section, and this part can be inserted in the driver of drill bit.
According to a forth aspect of the invention, the drill bit provided comprises:
One bar section has the drilling end that forms drilling point:
At least one end face, this end face extends and contributes to form the drilling point to drilling point, and the longitudinal axis of this end face or each end face and bar section roughly is acute angle; And
At least one is defined in the groove in bar section, the chip that this groove produces when drilling for carrying-off, and wherein at least one groove and at least one end face intersect, and form continuous bend in groove-end face intersection like this.
According to a fifth aspect of the invention, the drill bit provided comprises:
One bar section, have the drilling end that forms drilling point;
At least one end face, this end face extends and contributes to form the drilling point to drilling point, and the longitudinal axis of this end face or each end face and bar section roughly is acute angle; And
At least one is defined in the groove in bar section, the chip that this groove produces when drilling for carrying-off, and wherein at least one groove and at least one end face intersect, wherein this end face or each end face:
(a) in bending or V-arrangement, being recessed into bar section;
(b) there is rib or the V-shaped groove extended along an edge.
Preferably, second and the surgical drill of the third aspect in the third aspect, limit in addition.
The accompanying drawing explanation
Also can comprise other any embodiment although fall into the scope of the invention, below describe the preferred embodiments of the present invention in connection with accompanying drawing by way of example, wherein:
Fig. 1 illustrates the perspective view of the first drill bit of the preferred embodiment of the present invention;
Fig. 2 shows the end view of the first drill bit shown in Fig. 1;
Fig. 3 A to 3C illustrates respectively the amplification end of the second drill bit in the preferred embodiment of the present invention, side view and perspective view;
Fig. 4 A to 4D illustrates respectively the front portion of the second drill bit shown in Fig. 3, end, and side view and perspective view, but be only schematic;
Fig. 5 A to 5C illustrates respectively the amplification end of the 3rd drill bit in the embodiment of the present invention, side view and perspective view;
Fig. 6 A to 6C illustrates respectively the amplification end of the 4th drill bit in the embodiment of the present invention, side view and perspective view;
Fig. 7 A to 7D illustrates respectively the amplification end of the 5th drill bit in the embodiment of the present invention, side view, perspective view and reverse perspective view;
Fig. 8 A to 8C illustrates respectively the amplification end of the 6th drill bit in the embodiment of the present invention, side view and perspective view;
Fig. 9 A to 9C illustrates respectively the amplification end of the 7th drill bit in the embodiment of the present invention, side view and perspective view;
Figure 10 A to 10C illustrates respectively amplification end, side view and the perspective view of the 8th drill bit in the embodiment of the present invention.
The specific embodiment
Fig. 1 shows the first drill bit 101 of the preferred embodiment of the present invention.Drill bit 101 comprises a bar section 103, and it has a tapering point 105 that forms a bit point of the drill.The material of manufacturing drill bit 101 depends on the application requirements of drill bit 101.But, for plastic operation, drill bit 101 is made by the rustless steel of surgery quality-class.Although not shown, the other end of drill bit 101 is suitable for being arranged in motor-driven chuck.For example the other end of drill bit 101 can be provided with a series of scale, cut-away and cannelure, and they are positioned at the contiguous drill bit other end place of bar section 103, are conducive to like this other end and are connected with the chuck of the driver of motor-driven surgical drill.Scale can be used for meaning that drill bit is inserted into the degree of depth of drive chuck and enters the degree of depth in the patient body.
Along the length of this second portion, the surface with respect to the bit point of the drill that is provided with second portion changes the degree of depth of the second portion 111 of each groove 107.More particularly, the degree of depth of the second portion 111 of each groove 107 becomes more and more shallow towards the drilling point 115 of drill bit 101.Make like this cutting power of the cut edge of more close drilling point 115 be less than the cutting power of cut edge 119 parts of more close bar section.The advantage of doing like this is that the material pinning that bit point of the drill is difficult for because being pierced by drill bit 101 fractures.
And tapering point 105 is compared relative more longer with the bit point of the drill of existing drill bit.Movement while providing like this distal point 115 that contributes to fixedly positioning drill bit 101 to prevent that drilling from starting.Do like this and contribute to the outer surface that makes distal point 115 thrust periosteum and pierce through bone, thereby make drill bit 101 location before drilling.Each surface that forms tapering point 105 is an angle with the longitudinal axis of drill bit 101.This angle is typically about 30 °, but also can for example, according to concrete application (hardness of drilling material), change.
As previously mentioned, drill bit 101 is made by the material that is suitable for concrete application.For example, when drill bit 101 tends to be used in the plastic surgery, drill bit 101 is made by the rustless steel of surgery quality-class.Drill bit 101 is made by the blank bar of suitable material.Can adopt suitable grinding machine that one end of blank bar is polished off, thereby form tapering point 105, and the other end of the drill bit 101 of suitably polishing, drill bit 101 can be fixed by drill chuck.
Also can adopt grinding machine to form groove 107.When forming the first 109 of each groove 107, it is fixing that the emery wheel of grinding machine keeps, and first 109 has constant depth like this.But, when forming the second portion 111 of groove 107, emery wheel is when drilling point 115 moves, it is gradually outwards away from bit point of the drill.The degree of depth that outside mobile emery wheel makes second portion 111 along bit point of the drill length and change.Near the cutting power of cut edge drilling point 115 that these characteristics produce is less, and increases towards the cutting power of bar section 103.Put 115 places in drilling and have less cutting power, reduced the probability that drilling point 115 fractures when drilling starts, this is to cause because cutting edge and the drilled material that cuts out hole pin.
Referring to Fig. 3, the figure shows the second drill bit 310.This drill bit 310 comprises a drilling rod 312, and the opposite end of this drilling rod is suitable for being arranged in motor-driven drill chuck.For example, in order to carry out plastic operation, the opposite end of bar can be provided with a series of scale 314, cut-away 315 and cannelure 316 at adjacent end 313 places, is beneficial in the chuck of its driver that is connected to motor-driven surgical bur.Scale can be used for meaning that drill bit inserts the degree of depth in drive chuck and enters the degree of depth in the patient body.
Be provided with drilling point 319 at drilling end 318.With traditional drill bit, compare, described drilling point is elongated, tapered point roughly.In reality, the drilling point is set as the trocar (trocar) form.
In addition, be provided with one or morely, be generally three angled end-faces 320, they form drilling points 319, the longitudinal axis A of each end face and bar section 312 at drilling end 318 jointly
χbe an angle α.Usually this angle α is about 30 °, although also can for example, change according to concrete application (hardness of drilling material).Three end faces make end 318 roughly be the outward appearance of Rhizoma Sparganii taper.
Advantageously, angled end-face 320 structure qualifications be conducive to cutting along the 322，Gai cut edge, cut edge of each angled end-face, when bit, be easy to pierce in bone or analog like this.
The structure that is positioned at the end drilling point 319 of drilling end 318 can also make the drill bit secure localization on bone, punctures periosteum and pierces through the outer surface of bone, thereby make the drill bit location before drilling.
According to the present invention, and be clearly shown that in Fig. 3 A, each groove 317 intersects departing from through the position of the centre line C L of end face 320 and end face 320 separately.The advantage departed from like this is that it is conducive to when venting cuts bone, cartilage or other human material to greatest extent the chip produced.
For example, referring to Fig. 3 A, and suppose that drill bit turns clockwise, topmost face 320 ' defines a guiding edge 322 ' and a trailing edge 322 ".Can see, position and the trailing edge of groove 317 ' are adjacent.Like this, when bit, the cutting of guiding edge 322 ' through material, chip is by this edge and by largest end face zone 320 ', held before through entering groove 317 '.This largest end face zone prevents that chip is at end face bunchy or caking, and promotes chip to discharge from drilling point.Therefore, the crossing optimum position of each groove and its end face separately is adjacent with the trailing edge of this end face, as shown in Figure 3A.Advantageously, drain fast chip and also help drilling more quickly.
Now, referring to Fig. 5 A to 5C, wherein identical Reference numeral is for meaning similar or identical parts, and drilling end 518 is provided with four angled end-faces 520 (being generally in this embodiment flat end face) now.These four end faces make drilling end 518 roughly present rectangular pyramid shape outward appearance.
As can knowing in Fig. 5 A and seeing, only two end faces (being two relative end faces in this embodiment) are provided with the groove crossing with it 517.Have, the middle body of these grooves and their end faces separately departs from again, to strengthen the effect of discharging as previously mentioned chip.Those end faces of not establishing groove also provide the effect of reinforcing sleeve needle-like to drilling end 518.
From Fig. 5, can also see, with the groove of Fig. 3 and drill bit in 4, compare, the groove 517 in Fig. 5 has been increased.Do like this and can guarantee to maintain the chip discharge rate in the situation that reduce number of grooves, and can also make groove can pick up chip (when drilling bit high-speed rotary) when not establishing fluted end face.In addition, the operation of drill bit is identical with the drill bit of Fig. 3 and 4.
Now referring to Fig. 6, wherein identical Reference numeral is for meaning similar or identical parts, and the surgical bur shown in figure is provided with three end faces at drilling end 618, with the drill bit-like of Fig. 3 and 4 seemingly.The groove separately that each end face also has and they intersect, but in this embodiment, intersecting between groove and its end face separately be not sudden change but progressive, by the zone 626 of continuous bend, facilitated.This zone forms a kind of fan-shaped or spill at each end face 620, has strengthened like this degree of accuracy of drilling point 619, also provides more channels result that significantly enter each groove, with guiding and reinforcement, discharges the chip cut out by the drill bit rotated.
More obvious drilling point is conducive to be easier to drill bit and locates and be easier to penetrate this surface on smooth cutting surfaces.Zone 626 is conducive to drain quickly chip, thereby is conducive to cut quickly.
Now referring to Fig. 7 A to 7D, the drill bit of Fig. 6 is also further improved, wherein each end face 720 concaves with respect to drill bit, has formed an arc 3D scalloped surface.This point can be clear that with reference to Fig. 7 D.
This fan-shaped effect is more point-like or more sharp-pointed of drilling point 719, and cut edge becomes along its length as crooked, and more sharp-pointed (because the speed of fall of each end face 720 on the both sides, cut edge is faster).
The drill bit of Fig. 7 has also adopted the zone 726 with end face 720 intersection continuous bend at groove 717, and the chip so in use cut out by the drilling end can pass away fast from here.
In Fig. 7, in end view (being Fig. 7 A), the indent end face is usually around end face centre line C L symmetry.But for example the indent end face can be defined as around centrage asymmetricly, adjacent with guiding edge 722 ' like this, it is steeper that end slope obtains, and inclined-plane is towards trailing edge 722 " more oblique gradually.On each end face, this symmetry of indent departs from that can to make to guide edge sharper with respect to trailing edge, and makes chip strengthen (by pressure reduction etc.) towards the carrying-off of groove 717.The drill bit of Fig. 7 operate in other side and previously described similar.
Now, referring to Fig. 8, the indent curved end face of Fig. 7 is substituted by the sub-end face 827 and 828 on two planes. Sub-end face 827 and 828 is defined as end face 820 taper V shape groove (towards drilling point 819, becoming taper) in end view (being Fig. 8 A).Equally, the application of interior concave V shape end face 820 makes edge 822 more sharp-pointed or remarkable, and contributes to guide chip into groove 817 through bending area 826.
Have, common sub-end face 827 and 828 is arranged to around end face centre line C L symmetry, but also can asymmetricly depart from again, and for example makes inclined-plane leave the guiding steeper inclination in edge 822 ', and with trailing edge 822 " relative.In addition, can limit so a sharper cut edge, and contribute to chip to distribute away from drilling end 818.
Now referring to Fig. 9 A to 9C, wherein identical Reference numeral is for meaning similar or identical parts, the drill bit shown in figure or there is flat end face 920 as shown in Figure 6, or there is the curved end face shown in Fig. 7.Under any circumstance, be provided with in this embodiment the inclined-plane 930 of the end face separately that tilts away to go forward side by side into it from guiding edge 922, as be clearly shown that in Fig. 9 A.Same as be clearly shown that in Fig. 9 A, the segment 931 on inclined-plane 930 extends continuously, away from trailing edge 922 ", drilling point 919 is formed by the end face merging of three inclinations like this, and therefore has single conical in shape (being sleeve pipe needle-like).
This inclined-plane is arranged and has been strengthened the intensity of drilling point and prevented that it from fractureing, and the configuration of other drilling point may can fracture under extreme case.In addition, the drill bit of Fig. 9 structurally with the drill bit-like of Fig. 6 and 7 seemingly, and operation and previously described drill bit also similar.
Referring now to Figure 10 A to 10C, wherein identical Reference numeral, for meaning similar or identical parts, there is shown further improved drill bit.In this embodiment, similar with the mode of Fig. 3, that end face 1020 is generally is flat (although also can be slightly indent).And, in this embodiment, at groove 1017 with end face 1020 intersections are not shown that the continuous bend zone is arranged, although also can suitably provide this zone.
The unique distinction of this embodiment is, along trailing edge 1022 " be provided with the V-shaped groove 1032 that extends to groove 1017 from drilling point 1019.This V-shaped groove 1032 ends at groove 1017, and provides for making chip be directed into the further mechanism of the passage of groove.In addition, it sharpens the guiding edge 1022 ' of guiding each end face 1020, thereby has strengthened cutting power.It can also make chip be pulled away discharge from the front portion at guiding edge when bit.V-shaped groove 1032 can be symmetry or asymmetric as previously mentioned, and its advantage as previously mentioned.
Have again, in the drilling of this embodiment, put 1019 places, in fact be provided with six cut edges, further to strengthen drill bit, insert through periosteum and transmit fast the action etc. that the drill bit cutting enters bone.
In addition, the operation of the drill bit of Figure 10 is the same with previously described drill bit operation.
Common groove, end face and groove machining in bar section 1012 goes out, and bar section is made by the Surgical Grade rustless steel usually.
Bar section generally has cylindricality or circular cross-section, for example, although also can adopt other cross sectional shape (hexagon or avette).
Those skilled in the art are by clear, and invention described herein is easily changed and revises on the basis of the special case of aforementioned description.Should be appreciated that, invention comprises that all these fall into these changes and correction within design of the present invention and scope.
Claims (8)
1. a drill bit comprises:
One bar section, have the taper drilling end that limits drilling point;
Form at least in part at least one end face on the taper drilling end of this drilling point, the longitudinal axis of this at least one end face and bar section roughly is acute angle; And
That limit in bar section and at least one groove that extend away from taper drilling end, described at least one groove aligns with described at least one end face, the chip produced during for the carrying-off drilling, this at least one groove and described at least one end face intersect, like this, in end view, this groove deviates from the middle body of described end face, and wherein this groove intersects in groove-end face intersection, to limit a continuous bend surface with nonmutationed mode and this end face, this curved surface leads to described groove from described end face, thus, chip is improved to the guiding in groove, and wherein said at least one groove is roughly spiral extension from its each end face, and at least along the part of bar section, extend.
2. drill bit as claimed in claim 1, wherein end face or each end face:
(a) be flat, be defined as an inclined-plane;
(b) in Curved or V-arrangement, being recessed into bar section;
(c) there is rib or the V-shaped groove extended along an one edge.
3. drill bit as claimed in claim 2, wherein, in (c), described at least one groove extends in the end face adjacent with a described edge.
4. drill bit as claimed in claim 3, wherein groove and V-shaped groove intersect.
5. as the described drill bit of one of aforementioned claim 1-4, wherein drilling end place is provided with three end faces, and each end face departs from respect to other two equably, and each end face diminishes downwards to the drilling point, so that the drilling end that presents Rhizoma Sparganii taper outward appearance to be provided.
6. drill bit as claimed in claim 5, wherein groove separately is arranged to intersect with each end face.
7. drill bit as described as any one in claim 1 to 4, wherein at drilling end place, be provided with four end faces, each end face relatively adjacent face of other both sides departs from equably, and each diminishes downwards to the drilling point, so that the drilling end that presents rectangular pyramid shape outward appearance to be provided.
8. drill bit as claimed in claim 7, wherein arrange each groove only with two end faces in each intersect, these two end faces are opposing end surface at the drilling end.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2002950673A AU2002950673A0 (en) | 2002-08-08 | 2002-08-08 | Surgical drill bit |
| AU2002950673 | 2002-08-08 | ||
| AU2002953610 | 2002-11-08 | ||
| AU2002953610A AU2002953610A0 (en) | 2002-11-08 | 2002-11-08 | Surgical drill bit |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB038225034A Division CN100528093C (en) | 2002-08-08 | 2003-08-07 | A drill bit and method for producing a drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101642382A CN101642382A (en) | 2010-02-10 |
| CN101642382B true CN101642382B (en) | 2014-01-01 |
Family
ID=27809766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910139683.8A Expired - Fee Related CN101642382B (en) | 2002-08-08 | 2003-08-07 | Drill bit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101642382B (en) |
| AU (1) | AU2002950673A0 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US180554A (en) * | 1876-08-01 | Improvement in metal-drill bits | ||
| US1859202A (en) * | 1928-09-08 | 1932-05-17 | Cleveland Twist Drill Co | Drill |
| US2391396A (en) * | 1942-04-27 | 1945-12-25 | John S Denison | Drill |
| US3626645A (en) * | 1968-10-18 | 1971-12-14 | Renault | Method of sharpening twist drills |
| GB2181076A (en) * | 1985-09-30 | 1987-04-15 | John W Baker | Surgical drilling implement |
| CN2156812Y (en) * | 1993-02-17 | 1994-02-23 | 中国人民解放军第二一零医院 | Safety bone drill |
| US5967712A (en) * | 1998-11-03 | 1999-10-19 | Kennametal Inc. | Cutting tool for machining bores in materials having spring-back |
-
2002
- 2002-08-08 AU AU2002950673A patent/AU2002950673A0/en not_active Abandoned
-
2003
- 2003-08-07 CN CN200910139683.8A patent/CN101642382B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US180554A (en) * | 1876-08-01 | Improvement in metal-drill bits | ||
| US1859202A (en) * | 1928-09-08 | 1932-05-17 | Cleveland Twist Drill Co | Drill |
| US2391396A (en) * | 1942-04-27 | 1945-12-25 | John S Denison | Drill |
| US3626645A (en) * | 1968-10-18 | 1971-12-14 | Renault | Method of sharpening twist drills |
| GB2181076A (en) * | 1985-09-30 | 1987-04-15 | John W Baker | Surgical drilling implement |
| CN2156812Y (en) * | 1993-02-17 | 1994-02-23 | 中国人民解放军第二一零医院 | Safety bone drill |
| US5967712A (en) * | 1998-11-03 | 1999-10-19 | Kennametal Inc. | Cutting tool for machining bores in materials having spring-back |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101642382A (en) | 2010-02-10 |
| AU2002950673A0 (en) | 2002-09-12 |
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