CN1177507A - Needle assembly for electrically stimulating nerve - Google Patents
Needle assembly for electrically stimulating nerve Download PDFInfo
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- CN1177507A CN1177507A CN 97118088 CN97118088A CN1177507A CN 1177507 A CN1177507 A CN 1177507A CN 97118088 CN97118088 CN 97118088 CN 97118088 A CN97118088 A CN 97118088A CN 1177507 A CN1177507 A CN 1177507A
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Abstract
An electrolocation apparatus is provided for locating a nerve to which anesthesia may be delivered. The apparatus includes a needle assembly having an electrically conductive needle cannula non-conductive tube secured over the needle cannula, and a conductive plating on the tube. The conductors are connected to astimulator that generates alternating high and low charge pulses with a constant low current level. The high charge pulses generate noticeable muscle twitches immediately after insertion of the needle into the patient. Muscle twitches responsive to the high charge pulses will peak in magnitude, and muscle twitchesresponsive to the low charge pulses will become observable as the needle approaches the targeted nerve, and will be indistinguishable from the muscle twitches responsive to the high charge pulses when the needle is in a position for administration ofanesthetic.
Description
The present invention relates to a kind ofly be used for locating effectively a nerve and then discharge narcotic device to this nerve.
Many therapys all need patient is carried out local anesthesia at least.For many therapys, local anesthesia or nerve block are better than general anesthesia.For example, local anesthesia or nerve block are less to the wound that the patient who undergos surgery causes usually, and the post-operative recovery time is short.
Local anesthesia or nerve block need be treated and execute narcotic nerve and position.There have been some to be used to locate neural method in the prior art.In this class existent method of great majority, the doctor utilizes general human dissection to gain knowledge generally localizing objects nerve.According to a kind of method of prior art, with a conductive pad be placed on the patient body with target nerve on the skin at a position of certain distance.For example, if target nerve is positioned at shoulder, then conductive pad can be fixed to the end of arm.Couple together with the stimulator box of a lead with conductive pad and prior art, as the back will further be explained, described stimulator box can produce electric current.Then, the general direction along nerve to be anaesthetized is inserted into an electric insulation needle tubing that has on-insulated conductive pinpoint in skin and the subcutaneous tissue.By a lead pin of this prior art and the electrostimulator box of this prior art are coupled together.
The stimulator box of prior art is driven by electricity, and can produce adjustable current impulse in the persistent period of about 100-200 microsecond (" μ S ").This current impulse is set on the magnitude of about 1.0-5.0 milliampere (" mA ") at first.When syringe needle is put into tissue with the approaching position of target nerve the time, this electric current magnitude is enough to the stimulation target nerve usually.This thorn is goaded into action on the body part (for example finger) by target nerve control and is caused tangible muscle twitch.Then, this electric current slowly reduces, and disappears up to ballism.Then, push the syringe needle of this prior art to target nerve lentamente, up to occurring ballism once more.The syringe needle of this prior art continues to repeat this process, till can cause tangible muscle twitch with the electric current magnitude of about 0.2-0.3 milliampere.At this moment can think just that the syringe needle of this prior art is enough near waiting to execute narcotic target nerve.Then, when syringe needle continues to produce current impulse, directly by this syringe needle dispensing anesthetis.Usually regard the termination of muscle twitch as successfully locate this nerve sign.
Electricity in prior art location (electrolocation) method is attempted to guarantee accurately to place and is used to apply narcotic syringe needle.But there are several shortcomings in the device and the method in the prior art that are used for the prior art of electric localizing objects nerve.For example, the electric positioner that comprises the prior art of stimulator box be one huge, expensive, reusable and be difficult for the disinfectant device.Therefore, there are some and the relevant problem of electric positioner of in the gnotobasis of operating room, using this prior art.Generally need finish the method for this prior art by two technical staff, that is, first technical staff operates and handles syringe needle under gnotobasis, and second technical staff and first technical staff separate, under non-sterile condition, operate, reduce the electric current magnitude gradually.Use two technical staff's inevitable requirements than higher cost, and require between these two technical staff, reasonable coordination and communication are arranged.
The second, the device of this prior art can not indicate clearly when syringe needle has been on the position that is suitable for injecting narcotic.The attending doctor must determine when that syringe needle is in the optimum position with judgement and experience.
The 3rd, because the distance between the conductive pad of insulated pin and prior art is long, reach required electric current magnitude than higher voltage so need to produce.In the electric positioner of prior art, adopt the voltage of at least 25 volts (" V ") usually.These have limited the application of the device of prior art than higher voltage magnitude.For example, this high voltage magnitude can influence the performance of pacemaker and other implanted electronic installation.Therefore, the electric positioner of prior art can not be used on one's body the patient who has the implanted electronic installation usually.
The danger of starting arc is arranged than higher energy in addition.Therefore, the electric positioner of prior art can not be applied in many surgical environments, for example can not be applied to will use in the environment of oxygen, because the danger that causes fire or blast is arranged.High electric current magnitude also may be damaged near the tissue the syringe needle.
The purpose of this invention is to provide and a kind ofly accurately reach effective localized electric positioner discharging narcotic nerve.This device uses enough low energy magnitude to avoid the tissue injury that may cause, and has patient under the situation of implanted electronic installation and can use this device.And this device is enough little and cheap, can make and do disposable use, and can be sterilized fully, in the gnotobasis for use in operating room.In addition, only need a technical staff just can use this device.
As mentioned above, the needed voltage of electric positioner be two between the conductor distance and the function of patient's contact resistance.In order to reduce this distance significantly, the present invention is arranged on two conductors on the needle tubing.Or rather, electric positioner of the present invention can adopt a needle assembly with conductor of a pair of coaxial setting.This inner wire to coaxial conductor can be a pin.Can put a nonconducting overcoat or pipe in this inner wire outside then, and can or provide a kind of material of conduction to play outer conductor by plating, coating, bimetallic extruding.Can form an inclined-plane or wedge angle at the end of nonconducting pipe.This inclined-plane can be made of the nonconducting binding agent of one deck at the end of this pipe.The binding agent that forms the inclined-plane plays fixing tube and is convenient to needle assembly and is inserted into the intravital effect of patient.Distance between two conductors of this electricity positioner determines that by remote edge to the distance of the shell of conduction on inclined-plane this distance preferably is a bit larger tham 1.0 millimeters (" mm ").Because this distance is very little, so can produce required electric current with very little voltage.The inventor believes that of the present invention this makes this electric positioner be suitable for wearing the patient of pacemaker one class implanted electronic installation on the one hand.And low energy magnitude makes electric positioner of the present invention can be used in fact all operating room environments, comprises that the electric positioner of those prior arts may cause incendiary environment.In addition, low-voltage has been simplified circuit, thus can with very little packaged convenience sort circuit is provided.
As mentioned above, the electric positioner of prior art needs two technical staff, that is, first technical staff handles pin carefully, and second technical staff changes electric current carefully.Electric positioner of the present invention adopts the diverse structure with diverse principle work, and only needs a technical staff just can use electric positioner of the present invention.This electricity positioner has utilized following conclusion, promptly utilizes electric charge can Billy to measure the threshold value of the electrical quantity that produces muscle twitch more accurately with electric current.Electric charge is the product of electric current and time, therefore, both can also can change electric charge by changing the persistent period by changing electric current.In first preferred embodiment, electric positioner of the present invention produces constant current impulse; But a long persistent period and a relatively shorter persistent period alternately appear in pulse train.Like this, constant current pulse train alternately occurs than higher electric charge and lower electric charge.In second embodiment, this electricity positioner alternately sends than higher current impulse (for example 0.5mA) and lower current impulse (for example 0.1-0.2mA).Each pulse can have the same persistent period (for example 0.1-0.2 millisecond (" mS ")), and can produce these pulses with uniform interval (for example 0.25-2.0 second).
Use a method of electric positioner of the present invention to comprise to shift onto pin in the patient body and make at the quasi goal nerve.After skin is penetrated (for example, when needle point during from the about 1.0cm of target nerve), this will cause muscle twitch than higher charge pulse on the position neural away from this.And this lower charge pulse can not produce the electric charge that is enough to cause muscle twitch on this initial position.For example, these pulses may be by the interval of about half (back is referred to as " 1/2 " or " 0.5 ") second separately.Therefore, the doctor sees the muscle twitch that takes place with about one second interval in first meeting, and is corresponding with high charge pulse.
Along with pin is shifted to target nerve, the doctor can observe, and the amplitude of the initial viewed muscle twitch that is caused by high charge pulse has increase slightly.Simultaneously, the doctor also will begin to observe the little muscle twitch that is caused by the low charge pulse of following in each high charge pulse back.Like this, utilize the example of front, the doctor can observe, and locates a less ballism that is caused by low charge pulse in 0.5 second a big ballism back that is caused by high charge pulse, then, the big ballism that after 0.5 second, has another to cause again by high charge pulse.
The big ballism that is caused by high charge pulse will reach a peak value rapidly, and therefore, pin obviously increases towards amplitude or the intensity that being moved further of target nerve can not make the ballism that is caused by high charge pulse.
Along with pin continues to approach to target nerve, the amplitude and the intensity of the ballism that is caused by low charge pulse can increase gradually.The amplitude of low electric charge ballism and these variations of intensity are easy to be observed by the doctor of contact pin.Along with needle point approaches to target nerve, big and little ballism will become and be difficult to substantially differentiate, and the doctor can only observe with about 0.5 second interval or the same substantially muscle twitch that takes place with the twice that begins observed interval.This shows Xiang the doctor that just needle point has been in and has been suitable for discharging on the specified narcotic position.Can push anesthetis to target nerve by this pin then.Subsequently, dopey nerve will stop ballism, give clear and definite indication of doctor whereby: arrived target nerve and anesthetis and produced its expected effect.Then, the doctor only need pull a switch on the little controller of this electricity positioner flows to pin with disconnection electric current.
Although just be described herein the concept principle of the alternative charge pulse sequence of utilization generation height magnitude, but those skilled in the art should understand, can also electric positioner as described herein be become to produce multiple ladder charge pulse waveform with unit architecture according to concrete application requirements.For example,, perhaps can confirm, along with neurophilic approaching repeats to produce the charge pulse waveform that successively decreases than along with the neurophilic alternative sequence of charge pulse that produces absolute height and low magnitude of approaching is superior according to the anatomy of the neural peripheral region that will look for.In other words, described device and relevant unit architecture can be become do not produce the alternative sequence of height magnitude charge pulse, and produce multiple ladder charge pulse waveform, make the amplitude of each waveform be reduced to a selected minimum magnitude charge pulse from a selected maximum amount level charge pulse.Concerning some region of anatomy, this mode make the doctor in a wider context the clinical observation nerve for the reaction of charge pulse, thereby understand the method that nerve is positioned with this device more accurately.Also can adopt other impulse waveform.
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing, wherein,
Fig. 1 is the perspective view of bipolar electric positioner of the present invention;
Fig. 2 is the cutaway view of pin of the present invention;
Fig. 3 is the block diagram of generation of the present invention by the set of circuits parts of the suitable charge pulse of the pin among Fig. 2;
Fig. 4 is the example that some circuit blocks in the block diagram shown in Figure 3 are combined;
Fig. 5 illustrates pulse generation oscillogram of the present invention.
In Fig. 1, represent whole electric positioner of the present invention with numeral 10.Device 10 comprises a needle assembly 12, a stimulator 14 and a narcotic pipe 16 that is used for by needle assembly 12 dispensing doses.
As Fig. 2 clearly show that, needle assembly 12 comprised an elongated needle tubing 20, and this needle tubing 20 has relative near-end and far- end 22 and 24 and chambers 26 that stretch continuously between them.Needle tubing 20 is made by a kind of conductive material, is preferably made by rustless steel.The proximal part of needle tubing 20 is fixedly mounted in the stimulator 14, and the near-end of needle tubing 20 and far-end are positioned at the relative both sides of stimulator 14.The far-end 24 of needle tubing 20 is fined away, arrive target nerve so that pass through piercing tissue.
There is one deck or to electroplate the conductive layer 36 that forms on the outer cylinder surface of pipe 28 by coating.Layer 36 is gold preferably, and is distributed to the far-end 32 of pipe 28 with the thickness of about 550 dusts (Angstroms) continuously from managing 28 near-end 30 always.As hereinafter described, needle assembly 12 plays the effect of a pair of coaxial conductor effectively.Specifically, rustless steel needle tubing 20 plays inner wire, and the gold layer 36 of managing on 28 plays outer conductor.Managing 28 is nonconducting insulant that one deck will be respectively separated by rustless steel needle tubing 20 and gold layer 36 inner wire that constitutes and outer conductor.
As described above, rustless steel needle tubing 12 runs through stimulator 14 continuously, thereby the near-end 22 of needle tubing 20 is positioned at a side of stimulator 14, and far-end 24 then is positioned at a relative side of stimulator 14.The near-end 30 of plastic tube 28 is in the stimulator 14.Consequently, rustless steel needle tubing 12 and gold layer 36 all expose in stimulator 14, so that electrically contact.
Box body 38 has multiple function, is included as needle assembly 12 structural support is provided, and is convenient to the electronic component that holds needle assembly 12 and seal electric positioner 10 safely.
Comprise an on/off switch 48 and a light emitting diode (LED) 50 in the electronic circuit of stimulator 14, can get at and/or visible these two devices from the outside of box body 38.The effect of on/off switch 48 is other parts of connecting battery and circuit, as hereinafter described, perhaps also can be used to carry out the conversion between the high and low electric charge magnitude.The effect of LED 50 is along with each electrical energy pulse produces a light pulse, and the technical staff or the doctor in charge can be compared energy pulse and patient's muscle twitch on one's body.
Fig. 3 represents to be used for the circuit of stimulator 14.Those skilled in the art can understand, a way implementing sort circuit be with the CMOS technology as active device with its digitized.Other implementing method, it also is feasible for example adopting custom layout (" ICs ").Herein, on/off switch 48 links to each other with one 3 volts lithium battery 52.Under off-state, quiescent current is lower than 1 microampere (" μ A "), and therefore battery life has been guaranteed and should enough storage lives have been arranged electricity positioner 10 more than 8 years.Under on-state, the agitator sum counter that the back will be described is activated, and battery can use about 100 hours for stimulator 14.
The persistent period impulse modulation is realized by enumerator 54.Utilize the output of enumerator 54 can produce a pulse short as 122 μ S.Because the output of enumerator 54 is periodic signals, timing is selected the output signal of 56 selections of gating (Timing Selection Gating) network one-period and it is added on the current source network 58.In the embodiment shown in fig. 3, alternately low charge pulse of gating or high charge pulse of gating network 56.As shown in Figure 5, stimulator 14 can alternately produce the pulse of short and long duration.All these pulses all are constant currents, but the persistent period difference.For example, stimulator 14 can produce the pulse of a 0.2mA electric current magnitude that continues 122 μ S earlier to produce the lower electric charge of one 24.4 Na Ku (" nC "), and the current impulse that then produces a 0.2mA who continues 488 μ S is to produce the higher electric charge of a 97nC.Those skilled in the art can analyze out, and because of selecting the difference of the assembly that produces pulse, the pulse duration can change in the regular hour scope, for example, herein, this scope can be the persistent period+/-20%.Also can replace low electric charge and the high electric charge that occurs to producing with other constant-current pulse with various durations.
Also circuit design shown in Figure 3 can be become produce the form of the synthetic constant persistent period pulse of current amplitude.For example, the low current pulse that can produce a 0.2mA who continues 122 μ S to be producing the lower electric charge of a 24.4nC, and the high-current pulse that can then produce a 0.8mA who continues 122 μ S is to produce the higher electric charge of a 97nC.It should be noted that the electric charge that is produced by electric current magnitude modulation scheme equals the electric charge that is produced by the persistent period modulation scheme.
Fig. 3 is the block diagram of the set of circuits parts in the stimulator 14, and its effect is the suitable charge pulse that produces by bipolar pin 12, and Fig. 4 is an example combinations of the circuit block in the square frame of Fig. 3.As shown in Figure 3, so that enumerator 54 startings, another output of on/off controller 51 then is used for allowing and forbidding enumerator 54 by output control generator 53 of the on/off controller 51 of switch 48 starting.The 3rd output control circuit 55 of being fed, this control circuit 55 receive the constant current sink 58 on the electrode (20 or 36) that output and activation from enumerator 54 be connected in bipolar pin 12.The input that is used for the indicator circuit 57 of driving LED 50 comes from agitator 53, enumerator 54 and current source V+, and described current source V+ receives on another electrode (36 or 20) of described bipolar pin 12 by an electric charge limiter 59.The timing of charge pulse and amplitude are by regularly selecting gating component 56 modulation, and this regularly selects gating component 56 to link to each other with control circuit 55.
See the circuit details among Fig. 4 again, on/off controller 51 can comprise an on/off switch 48, this switch 48 with the voltage V+ of battery 52 with comprise that (R1, C3) circuit of combination is connected for a trigger A1B and a RC.When needs operative installations 10, switch 48 is placed on-position and keep on-state to prevent on pin, occurring any current fluctuation.The timing of trigger A1B control generator 53 (this agitator 53 can comprise a schmitt trigger A3A), and allow and forbid enumerator 54 (this enumerator 54 can be one 12 enumerator A2) and absorber control circuit 55 (this absorber control circuit 55 can comprise a trigger A1A).When A1B connected, output lead 12 was low or 0, and being reset to of enumerator A2 disconnects thereby can count like this, and being reset to of A1A disconnects thereby can change state.Correspondingly, the output lead 13 of A1B is high or just, thereby agitator A3A makes enumerator A2 counting for example with 4.096 kilo hertzs (" kHz ") work, so make 1 foot of A2 change a next state in per 1/2 second, 15 feet uprised once in per 1/2 second.Therefore, 15 feet change state with the speed that doubles 1 foot.When A1B disconnected, line 13 step-downs A3A is no longer exported, and line 12 uprised, and A2 and A1A are resetted.
When 15 feet of A2 uprised, the clock enabling signal output lead 1 that mails to A1A uprised.By means of voltage V+, provide base current to audion Q3 by resistance R 4 and R5.Make the Q3 conducting thus, thus closed from battery V+ through capacitor C 4, resistance R 7 to ground and the current path of the described pin 12 of flowing through.If be added in voltage on the R7 greater than 0.55V, then the base stage of audion Q2 is driven by resistance R 6, causes audion Q2 conducting, and this will reduce to flow to the base current of audion Q3, thereby make the voltage that is added in resistance R 7 two ends remain on 0.55V.Therefore, the electric current by pin 12 keeps constant substantially.When the current path of pin was short-circuited or opens circuit, then capacitor C 4 played the effect of an electric charge limiter by charging to a maximum charge of choosing in advance and restriction electric current magnitude.
The timing of current impulse and waveform are to utilize regularly to select gating component 56 to determine, described timing selects gating component 56 to comprise A3B, A3C and three doors of A3D, these acceptance come from the input of agitator A3A sum counter A2, and a trigger A1A who exports to absorber control circuit 55 is provided.Door A3B control sequential short pulse shown in Figure 5.Can see that the input pin 10 of A2 is worked when negative pulse, so that the output pin 15 of A2 is just becoming when the 3rd foot output of A3A becomes negative, as previously mentioned, driving A1A opens the electric current by the path of described pin.The 3rd foot output of A3A also is provided for the input pin 6 of an A3B, and another input pin 5 of door A3B is accepted the output of 1 foot of A2.If the signal of 1 foot signal thereby 5 feet is high, then when 6 feet when being high, an A3B can work.If 1 foot is low or is 0 that then 5 feet also are low, so the effect of door A3B unable to get up.The operation of door A3B can be used for controlling replacing of short and long charge pulse.When 1 foot when being high, then produce short pulse.
Say that more properly when the 3 foot step-downs of A3A, enumerator 54 will enter its NextState.15 feet uprise, and make electric current begin to flow through described pin, so and 1 foot be 5 feet of height A3B for high, and 6 feet and 3 feet are low or 0.The 4 feet output of A3B will be 1, and this output will input to 13 feet of an A3D.When being input as of foot 12 is high, then the output of door A3D foot 11 will be 0.At this moment, when 3 feet of agitator A3A are output as when high, enumerator A2 does not change state, but 5 feet of A3B and 6 feet will all be high, thereby the output of 4 feet will be 0, and what cause 13 feet is input as 0.If the input of 12 feet still is high, then A3D will be height in the output of 11 feet.High signal on 11 feet is coupled to the reset terminal of trigger A1A by capacitor C2, makes the 1 foot output of this trigger become 0, cuts off constant current sink 58 and flows through the electric current of pin 12.So will produce the persistent period is the short current impulse of 122 μ S.
In order to produce longer pulse, use door A3C and INHIBITORY-gate A3B.Since have only when 1 foot of A2 when being high A3B could work, so make signal step-down on 1 foot, A3B is closed.Under this condition, the reset function of A1A is only controlled by A3C.Can control the output of A3C according to the impulse ratio table of table 1.The combination of the foot by the enumerator A2 that will list in the input A (8) of A3C and B (9) and the table suitably couples together, and can obtain the short pulse shown in the left hurdle of this table and the time scale of long pulse, thereby realizes the pulse width modulation of charge pulse.
[table 1] impulse ratio table
| Time ratio | The A2 pin | |
| ????A | ????B | |
| ????1∶1 | ????10 | ????10 |
| ????2∶1 | ????9 | ????9 |
| ????3∶1 | ????9 | ????10 |
| ????4∶1 | ????7 | ????7 |
| ????5∶1 | ????7 | ????10 |
| ????6∶1 | ????7 | ????9 |
| ????8∶1 | ????6 | ????6 |
| ????9∶1 | ????6 | ????10 |
| ????10∶1 | ????6 | ????9 |
In order to realize pulse amplitude modulation, the input A of A3C can be linked to each other with 10 feet of A2 with B, to produce 1 to 1 burst length ratio, the pulse duration is 122 μ S.By with switch SW 1 closure, the circuit between the emitter stage of 1 foot of resistance R 10 in the constant current sink 58 and A2 and transistor Q3 is connected.When 1 foot when being high, electric current flows to ground by resistance R 10 and R7.Owing to the voltage on the R7 keeps the constant electric current that passes through R7 from two power supplys, so diminish by the electric current in the current path of pin 12.Therefore, the amplitude of the current impulse by pin 12 becomes a lower current impulse.When 1 foot of A2 when low, promptly during ground connection, therefore R10 ground connection in parallel with R7, reduce by the resistance on the current path of R7 and R10.Because the voltage at the contact place at them as described above remains on 0.55V, so need more electric current by these two resistance.Therefore, it is big that the amplitude of the current impulse by pin 12 becomes, and produces one than higher current impulse.So, utilize this circuit can realize pulse amplitude modulation.
In case of necessity, can switch in the circuit, realize pulse width and pulse amplitude modulation by the impulse ratio in the strobe pulse schedule of proportion and with resistance R 10.
At last, indicator circuit is configured to, no matter be which kind of modulation, whenever having produced a pulse, indicator circuit 57 all starts, and produces the indication of a simple on-off.So when charge pulse occurred, LED 50 was glittering, perhaps, buzzer 60 will send the sound along with the sequential and the change of state of the output of 15 feet of 3 feet of A3A and A2.
(annotate: if the circuit of Fig. 4 is used for amplitude modulation(PAM), then
R10=2.4 (1hi-11o) and R7=R10/1.8 (R10
*1hi-.25)
For pulse width modulation,
Without R10, and R7=.55/1)
As mentioned above, the near-end 22 of rustless steel needle tubing 20 entirely penetrates the shell 38 of stimulator 14.As shown in Figure 1, the near-end 22 of rustless steel needle tubing 20 links to each other with a flexible pipe 16, this flexible pipe 16 reach one can with joint that the narcotic syringe that is used for injecting selected dosage links to each other on.In an alternative embodiment, the near-end 22 of rustless steel needle tubing 20 directly can be installed to one can with needle adapter that the narcotic syringe that is used for injecting selected dosage links to each other on.
In use, anaesthetist or NA insert the far-end 24 of the sharpening of rustless steel needle tubing 20 in the patient bodies and push target nerve to.Without conductive pad and lead.In constant current embodiment as herein described, next start the switch 48 on the stimulator 14, to produce the low constant-current pulse of electric energy.LED 50 is along with each corresponding energy pulse produces a light pulse, and is working properly to confirm electric positioner 10.This corresponding energy pulse produced one every 1/2 second.The high charge pulse that continues the 0.2mA of 488 μ S will produce the electric charge of 97nC.Low charge pulse is the electric current of 0.2mA equally, but only continues 122 μ S, thereby only produces the electric charge of 24.4nC.After skin is penetrated by gold layer 34, the higher charge pulse of 97nC is enough to be created in substantially the body surface position can observable muscle twitch, and the low charge pulse of 24.4nC is not enough to causing any muscle twitch that can see with nerve at a distance of the position of this distance at first.Therefore, anaesthetist or NA can be seen the muscle twitch that takes place with about 1 second interval, and this interval is consistent with the generation of high charge pulse.
Along with needle assembly 12 is further pushed in the patient body, the amplitude of muscle twitch by a small margin will increase to the amplitude near the muscle twitch significantly that reaches peak value that is caused by high charge pulse.When the far-end 24 of rustless steel needle tubing 20 during near target nerve, the muscle twitch that is caused by the low charge pulse muscle twitch that almost is difficult to and is caused by high charge pulse that will become makes a distinction.So anaesthetist or NA can be seen the same basically muscle twitch that takes place with 0.5 second interval.This observed response prompting anaesthetist or the NA of being easy to, the tip of needle tubing 20 are enough near waiting to execute narcotic target nerve.So the hypodermic syringe by promoting to communicate with the near-end 22 of rustless steel needle tubing 20 injects anesthetis in the mode of routine.
Embodiment by the adjusting electric current magnitude that can replace with this embodiment also can carry out identical therewith process.
Although the present invention utilizes a preferred embodiment to describe, obviously, under the prerequisite that does not deviate from the invention scope that defines by appended claims, can also carry out multiple improvement.For example, thus stimulator can have and is used to change the electric current magnitude or pulse width changes the switching mechanism that passes to patient's corresponding charge level on one's body.In addition, can otherwise show the generation of pulse, comprise with a buzzer replacing above-mentioned LED or using jointly with above-mentioned LED.
Claims (10)
1. a needle assembly that is used for nerve is carried out electricity irritation is characterized in that, described needle assembly comprises:
A conduction needle tubing, described needle tubing has relative near-end and far-end and a chamber that stretches between near-end and far-end;
A non-conductive pipe that is arranged on the thin-walled on the described conduction needle tubing, described non-conductive pipe has relative far-end and near-end, and the described far-end of described non-conductive pipe and the described far-end of described conduction needle tubing are close; And
Be positioned at a conductive layer on the non-conductive pipe, thus, described needle tubing and described conductive layer constitute first and second conductors that separated coaxially by described non-conductive pipe respectively, and the described far-end of described conductive layer and the described far-end of described conduction needle tubing separate a very short segment distance.
2. needle assembly as claimed in claim 1 is characterized in that described needle tubing is made by rustless steel.
3. needle assembly as claimed in claim 1 is characterized in that described conductive layer comprises the coating that a layer thickness is approximately 550 dusts.
4. needle assembly as claimed in claim 3 is characterized in that described coating comprises gold.
5. needle assembly as claimed in claim 1, it is characterized in that, also comprise a nonconducting inclined-plane between the described far-end of the described far-end that is in described non-conductive pipe and described conduction needle tubing, defined the described distance between the described far-end of the described far-end of described conductive layer and described conduction needle tubing thus.
6. needle assembly as claimed in claim 5 is characterized in that, described nonconducting inclined-plane comprises that one deck is fixed on described non-conductive pipe the non-conductive binding agent on the selected axial location of described conduction needle tubing.
7. needle assembly as claimed in claim 1, it is characterized in that, the described near-end of described non-conductive pipe and the described near-end of described conduction needle tubing be from must be far away, and being used for of the described near-end of described conduction needle tubing and described conductive layer on the described near-end that is positioned at described non-conductive pipe being constituted separate electrically contacts the district with electric pulse generator is anastomosing.
8. needle assembly as claimed in claim 7 is characterized in that, the described near-end of described conduction needle tubing links to each other with a joint by the selected medicament of described chamber transmission.
9. needle assembly as claimed in claim 1 is characterized in that, the described distance between the described far-end of described conduction needle tubing and the described far-end of described conductive layer is about 1.0mm.
10. a needle assembly that is used for nerve is carried out electricity irritation is characterized in that, comprising:
A conduction needle tubing, described needle tubing has relative near-end and far-end and a chamber that stretches between near-end and far-end;
A non-conductive pipe that is arranged on the thin-walled on the described conduction needle tubing, the described far-end of described non-conductive pipe has relative near-end and far-end, and the described far-end of described non-conductive pipe is set to the described far-end of described conduction needle tubing is exposed; And
Be positioned at a conductive layer on the described non-conductive pipe, thus, the far-end of described conduction needle tubing and described conductive layer constitute first and second conductors that separated coaxially by described non-conductive pipe respectively, and described non-conductive pipe is configured to make the conduction needle tubing of described exposure and described conductive layer not to be on the same plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97118088 CN1177507A (en) | 1996-08-05 | 1997-08-05 | Needle assembly for electrically stimulating nerve |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US695,152 | 1996-08-05 | ||
| CN 97118088 CN1177507A (en) | 1996-08-05 | 1997-08-05 | Needle assembly for electrically stimulating nerve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1177507A true CN1177507A (en) | 1998-04-01 |
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ID=5174637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97118088 Pending CN1177507A (en) | 1996-08-05 | 1997-08-05 | Needle assembly for electrically stimulating nerve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1177507A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1838977B (en) * | 2003-05-20 | 2010-07-28 | 阿罗国际公司 | Instrument and method for delivery of anaesthetic drugs |
| CN103070667A (en) * | 2007-11-08 | 2013-05-01 | 泰拉克利昂公司 | Non-invasive device and method for locating a structure such as a nerve |
| CN108367116A (en) * | 2015-10-16 | 2018-08-03 | 里程碑科技有限公司 | Hypodermic method and apparatus are carried out using electrical nerve stimulation |
-
1997
- 1997-08-05 CN CN 97118088 patent/CN1177507A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1838977B (en) * | 2003-05-20 | 2010-07-28 | 阿罗国际公司 | Instrument and method for delivery of anaesthetic drugs |
| CN103070667A (en) * | 2007-11-08 | 2013-05-01 | 泰拉克利昂公司 | Non-invasive device and method for locating a structure such as a nerve |
| CN108367116A (en) * | 2015-10-16 | 2018-08-03 | 里程碑科技有限公司 | Hypodermic method and apparatus are carried out using electrical nerve stimulation |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |