CN1063216A

CN1063216A - Pen-shaped multifunctional medical testing probe

Info

Publication number: CN1063216A
Application number: CN 91106907
Authority: CN
Inventors: 洪光中
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-16
Filing date: 1991-01-16
Publication date: 1992-08-05

Abstract

Pen-shaped multifunctional medical testing probe mainly by 400Hz symmetrical square wave generator, Numerical control ohmmeter, four bidirectional analog switches, probe, a reference electrode of being made up of 74HC4066 are formed.It is based on measuring root length and pure electricity theory with electrical measuring method, and when promptly the tip of smooth broach arrived the apex of root of tooth physiological apical foramen, smooth broach and lip impedance between electrodes just were 5.6K Ω, and this resistance value accurately provides the length of measuring root canal.The present invention not only can be used for the test of toothache disease, but also can be used for the test of trigeminal neuralgia disease.Whole instrument is simple in structure, volume is little.Remarkable through clinical trial result.

Description

Pen-shaped multifunctional medical testing probe

What the present invention will propose is a kind of resistance value that is used to measure position between human body face and human teeth's root pipe and lip, determines the device-pen-shaped multifunctional medical testing probe of the human body cause of disease with this.Belong to the health care technology field.

The most function singlenesses of prior art, as the oral cavity impedance instrument of Hebei Medical College development, its structure is desktop, is exclusively used in to make a definite diagnosis the trigeminal neuralgia disease.The principle summary is: the voltage stabilizing of being exported by the generator of 400HZ obtains an alternating voltage through capacitor C, resistance R (given resistance value), this voltage passes through three comparators again after detection, filtering, make diode displaying then, show value is the fiducial value of tested resistance value and resistance R (definite) value, thereby the arrival position of test probe reaches the purpose of making a definite diagnosis the cause of disease as can be known.

The purpose that the present invention proposes is the problem at above-mentioned existence, propose a kind ofly not only can test the resistance value at position between Buccodental root pipe and the lip but also can test facial resistance value, thereby make a definite diagnosis the test instrunment-pen-shaped multifunctional medical testing probe of the sick and trigeminal neuralgia disease of treatment tooth.

Design philosophy of the present invention and technical solution: based on measuring root length and pure electricity theory with electrical measuring method, when being the tip arrival apex of root of tooth physiological apical foramen of smooth broach, smooth broach and lip impedance between electrodes just are 5.6K Ω, and this resistance value accurately provides the length of measuring root canal.Concrete structure is made up of probe, reference electrode and digital display test chart.Probe is for detachable, and wherein Φ 15 garden electrodes are mainly used in prosopalgic exploring electrode, and test clip is mainly used in root canal length measurement, and Φ 1 electrode is used for the dental caries perforation of pulp chamber and measures; The reference electrode branch garden shape torch utmost point is used for trigeminal neuralgia to be measured, and hook-shaped lip electrode is used for root canal length and surveys and other oral cavity impedance value measurement; The digital display test chart is the main body of instrument, is made up of 3 3/4 digital display meters, 400HZ measuring voltage generator and analog switch etc.Utilize a 74HC74 to constitute the secondary d type flip flop and carry out frequency division, become the 400HZ signal to deliver to the four bidirectional analog switch (K1 that form by 74HC4066 the 1600HZ clock division in the 3 3/4 bit digital ohmmeters, K2, K3, K4), the annexation of four bidirectional analog switches is: K1, K2 serial connection point C and probe join, K2, K4 serial connection point C0 and reference electrode join, K1 after the serial connection, K3 and serial connection back K2, K4 and interface A, B is just measuring retaining with ohm of 3 3/4 bit digital ohmmeters respectively, negative terminal joins, by K1, K4 and K2, the point E that the outfan of K3 joins, F joins with 400HZ symmetrical square wave generator respectively.

Accompanying drawing 1 is this test probe fundamental diagram.Among the figure 21 is that 400HZ measuring transmitter, 22 is 3 3/4 bit digital ohmmeters, the 23rd, and probe, the 24th, reference electrode.

Accompanying drawing 2 is wiring diagrams of this test probe, and 25 among the figure is that 3 3/4 digital ohm meter ohms retaining anode, 26 is 3 3/4 digital ohm meter ohms retaining negative terminals.

Accompanying drawing 3 is electrical schematic diagrams of this test probe.

Below in conjunction with accompanying drawing operation principle of the present invention and work process are described:

3 3/4 bit digital ohmmeters are commercially available 3211 type form of a stroke or a combination of strokes circuit testers, utilize its ohm retaining, and other retaining is as the voltage retaining, and the electric current retaining need not.Utilize a 74HC74 to constitute the secondary d type flip flop and carry out 4 frequency divisions, 1600HZ clock division in the 3211 type form of a stroke or a combination of strokes circuit testers is become the 400HZ signal, deliver to the four bidirectional analog switches of forming by 74HC4066, make switch be in K1, K4 conducting, K2, K3 shutoff and K1, K4 turn-off, the duty of K2, K3 conducting.Between probe and reference electrode, promptly formed the measuring-signal of 400HZ like this, this method has been eliminated fully by the voltaic voltage that influences certainty of measurement that forms between metal electrode and the human body surface electrolyte, this voltage can influence measured value, the way of eliminating is to utilize analog switch, 74HC4066(such as Fig. 1 circuit) to establish R be the human body practical impedance, E0 is a voltaic voltage, between AB, be added with DC measurement voltage, if the frequency with 400HZ makes K1 in turn, the K4 conducting, K2, K3 closes and K1, K4 closes, K2, the K3 conducting, in fact E0 has been become an alternating voltage, the meansigma methods of this voltage is zero, and the measuring voltage on the R is a direct current voltage all the time at the AB two ends.

Measured value can change when measuring frequency changes, and this is because there is capacitive component to have the cause that capacitive reactance also changes during frequency shift in the human body surface resistance value thereupon.So measurement standard is corresponding to characteristic frequency, measurement standard is corresponding to the 400HZ measuring frequency in this instrument.Change the purposes (promptly having multi-functional) that probe and reference electrode can change instrument.

Whole instrument is simple and reasonable, volume is little, in light weight, be easy to carry, easy to use, accurate.Remarkable through trial effect, both can be used for the test of toothache disease, can be used for the test of trigeminal neuralgia disease again.

Claims

1, by 400HZ symmetrical square wave generator, 3 3/4 bit digital ohmmeters, one four bidirectional analog switch (forming) by 74HC4066, probe, the pen-shaped multifunctional medical testing probe that reference electrode is formed, it is characterized in that utilizing a 74HC74 to constitute the secondary d type flip flop and carry out frequency division, become the 400HZ signal to deliver to the four bidirectional analog switch (K1 that form by 74HC4066 the 1600HZ clock division in the 3 3/4 bit digital ohmmeters, K2, K3, K4), the annexation of four bidirectional analog switches is: K1, K2 serial connection point C and probe join, K2, K4 serial connection point C0 and reference electrode join, K1 after the serial connection, K3 and serial connection back K2, K4 and interface A, B is just measuring retaining with ohm of 3 3/4 bit digital ohmmeters respectively, negative terminal joins, by K1, K4 and K2, the point E that the outfan of K3 joins, F joins with 400HZ symmetrical square wave generator respectively.