CN103070713A - Axial-force-controllable surgical bone drill using brazed PCBN (Polycrystalline Cubic Boron Nitride) superhard material drill bit - Google Patents
Axial-force-controllable surgical bone drill using brazed PCBN (Polycrystalline Cubic Boron Nitride) superhard material drill bit Download PDFInfo
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Abstract
The invention relates to an axial-force-controllable surgical bone drill using a brazed PCBN (Polycrystalline Cubic Boron Nitride) superhard material drill bit. The axial-force-controllable surgical bone drill has the advantages that the control accuracy is high and damages to brain tissues can be effectively avoided. A direct-current motor is arranged in the case of a drill body. The direct-current motor is connected with an intelligent integrated control system and a direct-current power supply. The output shaft of the direct-current motor is connected with a gear transmission device. The gear transmission device is connected with a drill bit chuck through a transmission shaft. A drill bit is installed on the drill bit chuck. A thrust bearing is arranged at the junction of the drill bit chuck and the transmission shaft. The thrust bearing is in close contact with a deformable element. The deformable element is in close contact with the case. The deformable element is positioned by using an elastic element. A resistance strain gage is bonded on the internal surface of the deformable element. The resistance strain gage is additionally connected with the intelligent integrated control system. A sealing device is arranged between the drill bit chuck and the case. The drill bit comprises a cylindrical basal body. A twist drill tip is arranged on the cylindrical basal body. A spiral groove is additionally arranged on the cylindrical basal body. PCBN superhard materials are arranged in the spiral groove and on the surface of the main rear blade of the drill bit.
Description
Technical field
The present invention relates to a kind of medical apparatus and instruments, concrete is a kind of controlled surgery bone drill of axial force that adopts soldering PCBN superhard material drilling bit.
Background technology
The apparatus of at present surgery skull boring is that hand electric bores, and the mode of operation that hand electric bores is: come keyhole direction and the amount of feeding by the free-hand support electric drill of doctor.Electric drill is designed with one group of safety device, and power source is connected with drill bit by clutch, when drill bit bears pressure drill bit is linked to each other with power source by clutch, drives drill bit and turns round to carry out the bone drilling operation; When bit drills penetrator bone, because can making drill bit, separates with power source the counteracting force that no longer bears skull, and electric drill is shut down.Yet these methods must rely on the abundant clinical experience of doctor individual and hand to feel to judge in the process of bone drilling whether passed through skull, and manually stop rapidly; If when carrying out via the doctor who lacks rich experiences, even the electric drill of above-mentioned specific safety device is arranged, careless slightly meninges and the nervous tissue that also might when passing through skull, injure below the skull.Adopt in addition free-hand mode to hole, also may because the arm strength deficiency causes boring procedure to produce vibrations, affect safety, accuracy and the comfortableness of boring procedure.
In order to increase safety and the accuracy in the surgery bone drilling process, " a kind of intelligent bone drill and control method thereof " (China Patent No. is 2009101036423) patent of invention disclose the bone drill motor be provided with strain-type torque sensor, speed probe or pressure transducer any one, two or three senser element; On the bone drill motor, also be provided with the induced signal of embedded intelligence control module receiving sensor collection and judge control bone drill motor.But this method is the matrix at the bone drill motor to be arranged speed probe, torque sensor and pressure transducer drill speed, moment of torsion and pressure is measured in real time.The precision of obvious this measuring method and accuracy can not guarantee requirement, because be subjected to various signals and complexity thereof on the matrix of bone drill motor, acquisition and processing precision and the accuracy of signal are difficult to be guaranteed, add stress point from drill bit to power source motor, driving-chain is long, and the precision of test and accuracy can not meet the demands.
Summary of the invention
Purpose of the present invention provides a kind of controlled surgery bone drill of axial force that adopts soldering PCBN superhard material drilling bit exactly for addressing the above problem, and the degree of accuracy of its control is high, can effectively avoid the damage to cerebral tissue.
For achieving the above object, the present invention adopts following technical scheme:
A kind of controlled surgery bone drill of axial force that adopts soldering PCBN superhard material drilling bit, it comprises drill body and drill bit, described drill body comprises casing, in casing, be provided with direct current generator, direct current generator is connected with dc source with intelligent integration control system, the output shaft of direct current generator is connected with gear drive, and gear drive is connected with drill bushing by power transmission shaft, and drill bit is installed on the drill bushing; Junction at drill bushing and power transmission shaft is provided with thrust bearing, thrust bearing is close to deformation element, deformation element abuts against on the casing, deformation element is located with flexible member, resistance strain gage sticks on the deformation element inner surface, resistance strain gage also is connected with intelligent integration control system, then is provided with sealing device between drill bushing and casing; Described drill bit comprises a cylindrical matrix, and cylindrical matrix is provided with the point of twist drill, also is provided with helicla flute on cylindrical matrix, and knife face M is provided with the PCBN superhard material behind helicla flute and drill bit master.
Described drill bit overall length L
3, the working portion length l
3, the drillstock of drill bit partly adopts the staight shank form, and drill bit adopts rustless steel to make: at first process the point of twist drill part at cylindrical matrix one end, and then be H at width of cylindrical matrix periphery processing
3, the degree of depth is h
3Helicla flute, spiral fluted width H
3Change according to bit diameter and the different of needs, its excursion is 0.5mm-5mm, degree of depth h
3Width change according to bit diameter and superhard material is selected between 0.2mm-2mm.The spiral fluted helixangleβ
3Excursion between 18 °-30 °; After helicla flute machines, with the PCBN superhard material cut into the drill bit master after the knife face M sheet material identical with the helicla flute shape, then behind the drill bit master in knife face M and the helicla flute, at this moment the height of the outstanding matrix of cutting edge is h to the method for using soldering with the PCBN superhard material brazing of well cutting
T3, according to the diameter d of stainless steel base
3Projecting height h with cutting edge
T3But the diameter D of drill bit
3Be controlled at 2mm-10mm.
Described intelligent integration control system comprises single-chip microcomputer, and single-chip microcomputer is connected with gauge tap with direct current generator by ON-OFF control circuit; Single-chip microcomputer also is connected with A/D converter, signal picker, amplifier, wave filter, bridge circuit successively simultaneously, and bridge circuit is connected with resistance strain gage; Signal picker gathers the voltage signal of measuring, then converting digital quantity to through A/D converter is input in the single-chip microcomputer, judge whether to satisfy the automatic stop condition: drill bit is drilling the suddenly decline of bone moment axial force, and later axial force can remain unchanged very little and substantially, so judging the foundation drill is exactly that the slope of the voltage signal that collects is less than a very little value that sets and substantially remain unchanged, single-chip microcomputer was namely judged and was satisfied the automatic stop condition this moment, namely can send the signal cut ON-OFF control circuit, thereby realize the automatic stop function;
Simultaneously, single-chip microcomputer judges according to the voltage signal that signal pickup assembly gathers whether axial force is excessive, judges that the excessive foundation of axial force is: the voltage signal that gathers is greater than certain value that sets, and at this moment single-chip microcomputer judges that namely axial force is excessive at this moment.
Described gear drive comprises a driving gear shaft that is connected by tongue and groove with the direct current generator output shaft, the driving gear shaft two ends are connected with the deep groove ball bearing II with the deep groove ball bearing I respectively and position, and two bearings are all realized the location by the shaft shoulder and casing; Driving gear shaft and driven gear engagement, driven gear is connected with driven shaft by flat key, driven gear is realized axial location by the shaft shoulder and axle sleeve I, the driven shaft two ends are symmetrically installed with deep groove ball bearing III and deep groove ball bearing IV, the deep groove ball bearing III is located with retainer nut's II, the shaft shoulder and casing, and the deep groove ball bearing IV is located with axle sleeve I, retainer nut's I and casing; Driven shaft links to each other by tongue and groove with power transmission shaft.
Described power transmission shaft is provided with the axle sleeve II, and the driven shaft two ends are installed in respectively on deep groove ball bearing V and the deep groove ball bearing VI.
Described sealing device is the sealing ring that is embedded on the casing.
The invention provides a kind of controlled surgery bone drill and drill bit thereof of axial force that adopts soldering PCBN superhard material drilling bit, in the process of boring, the axial force transmission route is that bone acts on the drill bit, drill bit passes to drill bushing, and drill bushing passes to power transmission shaft, and power transmission shaft passes to thrust bearing, thrust bearing passes to deformation element, so just cause deformation element generation deformation, cause the deformation of resistance strain gage, the axial force size just is converted into the size of resistance strain gage deformation quantity like this.The deformation meeting of resistance strain gage changes its resistance value, be converted to small magnitude of voltage through behind the bridge circuit, then carry out filtering through wave filter, after discharging interfering signal, after amplifier amplification, signal picker acquired signal and A/D converter 36 conversions, can be identified by single-chip microcomputer again, operating mode is judged.
When boring, may cause temperature to raise owing to plastic deformation and the frictional force between drill bit and bone of bone fragments.May cause osteonecrosis in the bone drilling process, the osteocyte of boring adjacent domain can cause permanent death when surpassing 50 ℃ of marginal values owing to borehole temperature.In order to reduce borehole temperature, boring procedure has prevented that as far as possible soon heat is passed in the bone adjacent tissue.By increasing axial force penetration rate is improved.Yet axial force is excessive, may cause the raising of patient's further fracture and drilling temperature.Drilling parameter is adjusted axial force and borehole temperature obviously can not tackle the problem at its root by changing.The present invention adopts braze welding diamond on the bone drill matrix surface, and realizes the controlled ordered arrangement of diamond abrasive grain.The exposed height of abrasive particle can reach 70 ﹪-80 ﹪, and the cutting edge that therefore is equivalent to act on behalf of with diamond abrasive grain bone drill is finished drilling operation, therefore can greatly reduce drill thrust, thereby reduce the drilling temperature.
The invention has the beneficial effects as follows: the fore bearing at the bone drill power transmission shaft is that thrust bearing is provided with deformation element and resistance strain gage, thereby the drill thrust in the monitoring drilling process, because fore bearing is directly near bit force point, monitoring and the transfer ratio of signal are more accurate, precision is high, can effectively prevent when the excessive or bone drill of axial force from wearing the injury to osseous tissue.The cutting edge of drill bit adopts the PCBN superhard material, and this material has improved the sharpness of cutting edge greatly, has reduced borehole axial power, thereby has reduced the drilling temperature; The excursion of the helical angle of drill bit is chosen between 18 °-30 °, can guarantee that smear metal can in time discharge smoothly, takes away heat, reduces temperature rise; Spiral fluted width H3 changes according to bit diameter and the different of needs, and its excursion is 0.5mm-5mm, and this scope can adapt to the processing request of different bore diameters; Be used for the thread groove severity control of soldering PCBN superhard material between 0.2mm-2mm, the intensity that this degree of depth can guarantee not damage bit matrix can guarantee again the stability of soldering PCBN superhard material.
Description of drawings
Fig. 1 is the cutaway view of surgery bone drilling automatic stop cooling electric drill;
Fig. 2 is the intelligent integration control system parts;
Fig. 3 is the axial force transmission block diagram;
Fig. 4 is that axial force detects control block diagram;
Fig. 4 a is that axial force detects control block diagram;
Fig. 5 is for drilling automatic stop function control block diagram;
Fig. 5 a is for drilling automatic stop function control block diagram;
Fig. 6 is the excessive control block diagram of axial force;
Fig. 6 a is the excessive control block diagram of axial force;
Fig. 7 is the bone drilling drill bit;
Fig. 7 a is the drill bit front view;
Fig. 7 b is the helicla flute location drawing;
Fig. 7 c is bit tip angle figure;
Fig. 7 d be among Fig. 7 B-B to enlarged drawing;
Fig. 7 e is helical groove structure figure.
Wherein, 1-dc source, 2-gauge tap, 3-driving gear shaft, the 4-casing, 5-direct current generator, 6-driven shaft, 7-intelligent integration control system, the 8-flat key, 9-driven gear, 10-axle sleeve I, 11-axle sleeve II, 12-retainer nut's I, 13-power transmission shaft, 14-resistance strain gage, the 15-flexible member, 16-deformation element, 17-thrust bearing, the 18-sealing ring, 19-drill bushing, 20-drill bit, 21-deep groove ball bearing I, 22-deep groove ball bearing II, 23-deep groove ball bearing III, 24-deep groove ball bearing IV, 25-deep groove ball bearing V, 26-deep groove ball bearing VI, 27-retainer nut's II, 28-retainer nut's III, 29-direct current generator base, 30-dc source bottom, 31-screwed hole, 32-bridge circuit, the 33-wave filter, 34-amplifier, 35-signal picker, the 36-A/D transducer, 37-single-chip microcomputer, 38-ON-OFF control circuit.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 has shown each ingredient of surgery bone drilling automatic stop cooling electric drill, and wherein casing 4 is made of the up and down two halves of symmetry, and is fixed by screwed hole 31 by screw.Dc source 1 links to each other with gauge tap 2 usefulness wires, and in conjunction with Fig. 2 as can be known, gauge tap 2 links to each other with ON-OFF control circuit 38 usefulness wires in the intelligent integration control system 7, and ON-OFF control circuit 38 is connected with direct current generator and is connected with wire.Direct current generator 5 is fixed on the direct current generator base 29.Direct current generator 5 and driving gear shaft 3 link to each other by tongue and groove, driving gear shaft 3 is installed in and realizes the location on deep groove ball bearing I 21 and the deep groove ball bearing II 22, and two bearings are all realized the location by the shaft shoulder and casing 4, driving gear shaft 3 and driven gear 9 are meshed, and driven gear 9 matches by flat key 8 and driven shaft 6.Driven gear 9 is realized axial location by the shaft shoulder and axle sleeve I 10, driven shaft 6 two ends are symmetrically installed with deep groove ball bearing III 23 and deep groove ball bearing IV 24, deep groove ball bearing III 23 usefulness retainer nut II 27, the shaft shoulder and casing 4 are located, deep groove ball bearing IV 24 usefulness axle sleeve I 10, retainer nut's I and casing 4 location.Driven shaft 6 links to each other with power transmission shaft 13 tongue and grooves, deep groove ball bearing V 25 is installed at power transmission shaft 6 two ends and deep groove ball bearing VI 26 realizes the location, deep groove ball bearing V 25 relies on retainer nut's III 28, axle sleeve II 11 and casing 4 location, the deep groove ball bearing VI 26 usefulness shaft shoulders, axle sleeve II 11 and casing 4 location.The shaft shoulder place of the other end of power transmission shaft 13 is equipped with a thrust bearing 17, thrust bearing 17 is close to deformation element 16, deformation element 16 other ends abut against on the casing 4, deformation element 16 usefulness flexible members 15 location, and resistance strain gage 14 sticks on deformation element 16 inner surfacies.Can get in conjunction with Fig. 2, resistance strain gage 14 links to each other with wire with bridge circuit in the intelligent integration control system 7.Drill bushing 19 is fixed on the power transmission shaft end, and drill bushing 19 is used for clamping drill bit 20.Sealing ring 18 is embedded in the casing and seals, and dc source bottom 30 is held on the casing 4.
As shown in Figure 2, intelligent integration control system 7 is by bridge circuit 32, wave filter 33, and amplifier 34, signal picker 35, A/D converter 36, single-chip microcomputer 37, ON-OFF control circuit 38 set form.Wherein, resistance strain gage 14 links to each other with bridge circuit 32 usefulness wires, bridge circuit 32 and wave filter 33 are communicated with, wave filter 33 links to each other with amplifier 34, amplifier 34 links to each other with signal picker 35, and signal picker 35 links to each other with A/D converter 36, and A/D converter 36 links to each other with single-chip microcomputer 37, single-chip microcomputer 37 with link to each other with ON-OFF control circuit 38, ON-OFF control circuit 38 links to each other with gauge tap 2 usefulness wires with direct current generator 5 respectively.
Can be got by Fig. 3, in the process of boring, the axial force transmission route is that bone acts on the drill bit 20, drill bit 20 passes to drill bushing 19, and drill bushing 19 passes to power transmission shaft 13, and power transmission shaft passes 13 and passes to thrust bearing 17, thrust bearing 17 passes to deformation element 16, so just cause that deformation occurs deformation element 16, cause the deformation of resistance strain gage 14, the axial force size just is converted into the size of resistance strain gage 14 deformation quantities like this.
The deformation meeting that can be got resistance strain gage 14 by Fig. 4, Fig. 4 a changes its resistance value, be converted to small magnitude of voltage through behind the bridge circuit 32, then carry out filtering through wave filter 33, after discharging interfering signal, after amplifier 34 amplifications, signal picker 35 acquired signal and A/D converter 36 conversions, can be identified by single-chip microcomputer 37 again, operating mode is judged.
By Fig. 5, Fig. 5 a as can be known, in the electric drill work, signal picker gathers the voltage signal of measuring, then converting digital quantity to through A/D converter 36 is input to and judges whether to satisfy the automatic stop condition in the single-chip microcomputer 37, if satisfy the automatic stop condition, single-chip microcomputer 37 can the transmission instruction open circuit ON-OFF control circuit 38 so, realizes the automatic stop function.Because drill bit is drilling the suddenly decline of bone moment axial force, and later axial force can remain unchanged very little and substantially, so judging the foundation drill is exactly that the slope of the voltage signal that collects is less than a very little value that sets and substantially remain unchanged, single-chip microcomputer 37 was namely judged and was satisfied the automatic stop condition this moment, namely can send signal cut ON-OFF control circuit 38, thereby realize the automatic stop function.
By Fig. 6, Fig. 6 a as can be known, the voltage signal that collects is received by single-chip microcomputer 37 after A/D converter 36 conversions, and axial force is excessive if single-chip microcomputer 37 is judged this moment, and single-chip microcomputer will send instruction to ON-OFF control circuit 38, reduce electric current, thereby axial force was controlled in normal range.Judge the excessive foundation of axial force be the voltage signal that gathers greater than certain value that sets, at this moment single-chip microcomputer 37 judges that namely axial force is excessive at this moment.
Shown in Fig. 7, Fig. 7 a-7e, by Tu Kede, this drill bit overall length L
3, the working portion length l
3, the drillstock of drill bit partly adopts the staight shank form, and the apex point part is similar with the apex point part of ordinary straight handle twist drill, and the drilling rod part of all the other drill bits processes on the cylindrical matrix surface, and the matrix material of drill bit adopts rustless steel.Concrete manufacture method: at first process and the identical apex point part of common fluted drill apex point shape at cylindrical matrix one end, the form parameter of apex point is consistent with standard fluted drill apex point parameter, and then is H at width of cylindrical matrix periphery processing
3, the degree of depth is h
3Helicla flute, spiral fluted width H
3Can change according to bit diameter and the different of needs, its excursion is 0.5mm-5mm, degree of depth h
3Width change according to bit diameter and PCBN superhard material is selected between 0.2mm-2mm, and the intensity that this degree of depth can guarantee not damage bit matrix can guarantee again the stability of soldering PCBN superhard material.The spiral fluted helixangleβ
3Excursion between 18 °-30 °, can guarantee that smear metal can in time discharge smoothly, take away heat, reduce temperature rise; After helicla flute machines, just the PCBN superhard material is cut into the drill bit master after the knife face M sheet material identical with the helicla flute shape, then the method for using soldering with the PCBN superhard material brazing of well cutting behind the drill bit master in knife face M and the helicla flute, this material has improved the sharpness of cutting edge greatly, reduce borehole axial power, thereby reduced the drilling temperature; At this moment the height of the outstanding matrix of cutting edge is h
T3, according to the diameter d of stainless steel base
3Projecting height h with cutting edge
T3Can be with the diameter D of drill bit
3Be controlled at 2mm-10mm.
Work process of the present invention is as follows:
In conjunction with Fig. 1 as can be known, at first drill bit 20 is installed on the drill bushing 19, then the Closed control switch 2, intelligent integration control system 7 judges that meeting path condition realizes that namely dc source 1 passes through ON-OFF control circuit 38 to direct current generator 5 power supplies, direct current generator produces power, the power that motor produces passes to driving gear shaft 3 by electric machine main shaft, driving gear 3 engagement by gear with power transmission to driven gear 9, interconnect function by flat key 8, driven gear 9 with transmission of power to driven shaft 6, driven shaft 6 again with transmission of power to power transmission shaft 13, power transmission shaft 13 with transmission of power to drill bushing 19, drill bushing 19 the most at last transmission of power has so just been realized the boring motion to drill bit 20.Can get in conjunction with Fig. 3, the reaction force acts of bone is on drill bit 20 in the process of boring, drill bit 20 passes to drill bushing 19, drill bushing 19 passes to power transmission shaft 13, power transmission shaft passes 13 and passes to thrust bearing 17, and thrust bearing 17 passes to deformation element 16, so just causes that deformation occurs deformation element 16, cause the deformation of resistance strain gage 14, the axial force size just is converted into the size of resistance strain gage 14 deformation quantities like this.The deformation meeting that can get resistance strain gage 14 in conjunction with Fig. 4 changes its resistance value, be converted to small magnitude of voltage through behind the bridge circuit 32, then carry out filtering through wave filter 33, after discharging interfering signal, after amplifier 34 amplifications, signal picker 35 acquired signal and A/D converter 36 conversions, can be identified by single-chip microcomputer 37 again, and operating mode is judged.Intelligence control system 7 can realize the axial force monitoring and drill two kinds of functions of automatic stop in the boring procedure.As shown in Figure 5, in the electric drill work, 35 pairs of voltage signals of signal picker gather, then converting digital quantity to through A/D converter 36 is input in the single-chip microcomputer 37, judge whether to satisfy the automatic stop condition, if satisfy the automatic stop condition, single-chip microcomputer 37 can the transmission instruction open circuit ON-OFF control circuit 38 so, realizes the automatic stop function.In conjunction with Fig. 6 as can be known, the voltage signal that collects is received by single-chip microcomputer 37 after A/D converter 36 conversions, and axial force is excessive if single-chip microcomputer 37 is judged this moment, will send instruction to ON-OFF control circuit 38, reduce electric current, thereby axial force was controlled in normal range.Boring is unloaded drill bit 20 after finishing, and equipment is carried out disinfection and keeps properly.
Claims (6)
1. controlled surgery bone drill of axial force that adopts soldering PCBN superhard material drilling bit, it comprises drill body and drill bit, it is characterized in that, described drill body comprises casing, be provided with direct current generator in casing, direct current generator is connected with dc source with intelligent integration control system, and the output shaft of direct current generator is connected with gear drive, gear drive is connected with drill bushing by power transmission shaft, and drill bit is installed on the drill bushing; Junction at drill bushing and power transmission shaft is provided with thrust bearing, thrust bearing is close to deformation element, deformation element abuts against on the casing, deformation element is located with flexible member, resistance strain gage sticks on the deformation element inner surface, resistance strain gage also is connected with intelligent integration control system, then is provided with sealing device between drill bushing and casing; Described drill bit comprises a cylindrical matrix, and cylindrical matrix is provided with the point of twist drill, also is provided with helicla flute on cylindrical matrix, and knife face M is provided with the PCBN superhard material behind helicla flute and drill bit master.
2. the controlled surgery bone drill of axial force of employing soldering PCBN superhard material drilling bit as claimed in claim 1 is characterized in that, described drill bit overall length L
3, the working portion length l
3, the drillstock of drill bit partly adopts the staight shank form, and drill bit adopts rustless steel to make: at first process the point of twist drill part at cylindrical matrix one end, and then be H at width of cylindrical matrix periphery processing
3, the degree of depth is h
3Helicla flute, spiral fluted width H
3Change according to bit diameter and the different of needs, its excursion is 0.5mm-5mm, degree of depth h
3Width change according to bit diameter and PCBN superhard material is selected between 0.2mm-2mm; The spiral fluted helixangleβ
3Excursion between 18 °-30 °; After helicla flute machines, with the PCBN superhard material cut into the drill bit master after the knife face M sheet material identical with the helicla flute shape, then behind the drill bit master in knife face M and the helicla flute, at this moment the height of the outstanding matrix of cutting edge is h to the method for using soldering with the PCBN superhard material brazing of well cutting
T3, according to the diameter d of stainless steel base
3Projecting height h with cutting edge
T3, the diameter D of drill bit
3Be controlled at 2mm-10mm.
3. the controlled surgery bone drill of axial force of employing soldering PCBN superhard material drilling bit as claimed in claim 1 is characterized in that, described intelligent integration control system comprises single-chip microcomputer, and single-chip microcomputer is connected with gauge tap with direct current generator by ON-OFF control circuit; Single-chip microcomputer also is connected with A/D converter, signal picker, amplifier, wave filter, bridge circuit successively simultaneously, and bridge circuit is connected with resistance strain gage; Signal picker gathers the voltage signal of measuring, then converting digital quantity to through A/D converter is input in the single-chip microcomputer, judge whether to satisfy the automatic stop condition: drill bit is drilling the suddenly decline of bone moment axial force, and later axial force can remain unchanged very little and substantially, so judging the foundation drill is exactly that the slope of the voltage signal that collects is less than a very little value that sets and substantially remain unchanged, single-chip microcomputer was namely judged and was satisfied the automatic stop condition this moment, namely can send the signal cut ON-OFF control circuit, thereby realize the automatic stop function;
Simultaneously, single-chip microcomputer judges according to the voltage signal that signal pickup assembly gathers whether axial force is excessive, judges that the excessive foundation of axial force is: the voltage signal that gathers is greater than certain value that sets, and at this moment single-chip microcomputer judges that namely axial force is excessive at this moment.
4. the controlled surgery bone drill of axial force of employing soldering PCBN superhard material drilling bit as claimed in claim 1, it is characterized in that, described gear drive comprises a driving gear shaft that is connected by tongue and groove with the direct current generator output shaft, the driving gear shaft two ends are connected with the deep groove ball bearing II with the deep groove ball bearing I respectively and position, and two bearings are all realized the location by the shaft shoulder and casing; Driving gear shaft and driven gear engagement, driven gear is connected with driven shaft by flat key, driven gear is realized axial location by the shaft shoulder and axle sleeve I, the driven shaft two ends are symmetrically installed with deep groove ball bearing III and deep groove ball bearing IV, the deep groove ball bearing III is located with retainer nut's II, the shaft shoulder and casing, and the deep groove ball bearing IV is located with axle sleeve I, retainer nut's I and casing; Driven shaft links to each other by tongue and groove with power transmission shaft.
5. the controlled surgery bone drill of axial force of employing soldering PCBN superhard material drilling bit as claimed in claim 1 is characterized in that, described power transmission shaft is provided with the axle sleeve II, and the driven shaft two ends are installed in respectively on deep groove ball bearing V and the deep groove ball bearing VI.
6. the controlled surgery bone drill of axial force of employing soldering PCBN superhard material drilling bit as claimed in claim 1 is characterized in that, described sealing device is the sealing ring that is embedded on the casing.
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| CN201310010852.4A CN103070713B (en) | 2013-01-12 | 2013-01-12 | Axial-force-controllable surgical bone drill using brazed PCBN (Polycrystalline Cubic Boron Nitride) superhard material drill bit |
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| CN201310010852.4A CN103070713B (en) | 2013-01-12 | 2013-01-12 | Axial-force-controllable surgical bone drill using brazed PCBN (Polycrystalline Cubic Boron Nitride) superhard material drill bit |
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| CN105066900A (en) * | 2015-07-14 | 2015-11-18 | 国家电网公司 | Electric grounding grid buried depth tester |
| CN108348264A (en) * | 2015-09-03 | 2018-07-31 | 史赛克公司 | Powered surgical drill with integrated depth gauge including probe sliding on drill bit |
| CN110522493A (en) * | 2019-08-14 | 2019-12-03 | 蚌埠医学院第一附属医院 | A kind of operation of opening cranium skull milling cutter |
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| CN203089275U (en) * | 2013-01-12 | 2013-07-31 | 青岛理工大学 | Axial-force controllable surgical bone drill provided with brass-solder polycrystalline cubic boron nitride (PCBN) superhard material drill bit |
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| US20090003949A1 (en) * | 2007-06-26 | 2009-01-01 | Kwok Ting Mok | Chuck Assembly |
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| CN105066900A (en) * | 2015-07-14 | 2015-11-18 | 国家电网公司 | Electric grounding grid buried depth tester |
| CN108348264A (en) * | 2015-09-03 | 2018-07-31 | 史赛克公司 | Powered surgical drill with integrated depth gauge including probe sliding on drill bit |
| CN108348264B (en) * | 2015-09-03 | 2021-04-30 | 史赛克公司 | Powered surgical drill with integrated depth gauge including probe sliding on drill bit |
| US11812977B2 (en) | 2015-09-03 | 2023-11-14 | Stryker Corporation | Method and system for determining breakthrough depth of a bore formed in bone |
| CN110522493A (en) * | 2019-08-14 | 2019-12-03 | 蚌埠医学院第一附属医院 | A kind of operation of opening cranium skull milling cutter |
| CN110522493B (en) * | 2019-08-14 | 2022-05-03 | 蚌埠医学院第一附属医院 | Skull milling cutter for craniotomy |
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