CN110538371A - An automatic drug injection device for nerve block - Google Patents

Abstract

The invention discloses an automatic drug injection device for nerve block, which comprises a power device, a syringe and a needle holder. The syringe includes a syringe and a piston rod capable of moving in the syringe. The front end communicates with the puncture needle through the drug injection catheter, and the edge of the other end is provided with needle fins, and the drug injection catheter runs inside the needle handle; There is a moving slot, the needle-fin fixing card is fixed on the housing, and the piston handle fixing card slides on the moving slot; the injection button and the withdrawal button are set on the needle handle, and the injection button and the withdrawal button are driven by the control wire. Institutional connections. The operating doctor can control the injection or withdrawal with one hand through the injection button and withdrawal button on the needle handle, and only one person can complete the nerve block anesthesia, saving manpower; it also helps the anesthesiologist understand the dynamics of the injection pressure, Provide a reference for the injection situation.

Description

An automatic drug injection device for nerve block

technical field

The invention belongs to the technical field of medical devices, and in particular relates to an automatic drug injection device for nerve block.

Background technique

Nerve block anesthesia is a method of injecting local anesthetics around nerve trunks, plexuses, and nodes to block their impulse conduction, anesthetize the innervated area, and achieve painless surgery. It is currently widely used in clinical practice. , Commonly used nerve blocks are helpful for intermediary, infraorbital, sciatic, and digital (toe) nerve trunk blocks, cervical plexus, brachial plexus blocks, and stellate ganglion and lumbar sympathetic ganglion blocks for diagnosis and treatment.

Ultrasound-guided nerve block is an important technology that has been rapidly popularized in recent years. This technology requires the anesthesiologist to operate the ultrasound probe with one hand to display the nerve, while the other hand operates the nerve block puncture needle to reach the block under the guidance of ultrasound. At the stagnation point, it is necessary to draw back to observe whether the puncture needle is strayed into the blood vessel before injecting the drug. At this time, an anesthesia assistant is usually required to repeatedly withdraw and inject the drug under the instructions of the anesthesiologist, and it is often necessary to adjust the injection according to the injection situation. Changing the block point, the cooperation of the anesthesia assistant is sometimes difficult to meet the requirements of the anesthetist, which may affect the effect and efficiency of the nerve block.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an automatic drug injection device for nerve block that can be operated by a single person, so as to reduce manpower, shorten the time of nerve block test injection, and improve the test injection efficiency.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

An automatic drug injection device for nerve block, comprising a power unit, a syringe mounted on the power unit, and a needle-holding handle;

The syringe includes a syringe and a piston rod capable of moving in the syringe, the tail end of the piston rod is provided with a piston handle, the front end of the syringe communicates with the puncture needle through the injection catheter, and the edge of the other end Needle fins are provided, and the injection catheter runs inside the needle-holding handle;

The power device includes a housing, a driving mechanism arranged in the housing, a needle-fin fixing card for fixing the needle cylinder, and a piston handle fixing card for fixing the piston handle. The housing is provided with a moving groove, The pin-fin fixing card is fixedly arranged on the housing, and the piston handle fixing card is slidably arranged on the moving groove;

An injection button and a withdrawal button are arranged on the needle-holding handle, and both the injection button and the withdrawal button are connected to the driving mechanism through a control wire.

Further, it also includes a pressure sensor arranged inside the piston handle fixing card for measuring the injection pressure and a pressure display arranged on the housing, and the pressure sensor and the pressure display are connected by electrical signals connect.

Further, the drive mechanism includes a motor, a screw and a nut arranged on the screw, the output shaft of the motor is connected to the screw to drive the screw to rotate, the nut is connected to the fixed clip of the piston handle, and the injection button passes through The control wire is connected with the forward rotation circuit of the motor, and the withdrawal button is connected with the reverse rotation circuit of the motor through the control wire.

Further, the piston rod is composed of a coaxially distributed piston connecting rod, an elastic body and a moving push rod, the piston connecting rod is located in the syringe, and one end of the moving pushing rod passes through the elastic body and the moving push rod. The piston connecting rod is connected, and the other end is fixedly connected with the piston handle. A pressure alarm is arranged on the outer end surface of the piston handle. The pressure alarm can be electrically connected with the power supply through the connection circuit. When the moving push rod is connected with the piston When the force between the rods is equal to the set pressure of 15psi of the elastic body, the pressure alarm will form a closed circuit by connecting the circuit and the power supply, so that the pressure alarm will work with electricity and output alarm information.

Excessive pressure of injecting anesthetics during nerve block will damage the nerves. The piston connecting rod passes through the elastic body with set pressure (such as a spring, etc., which can be set by parameters such as the length and elastic coefficient of the spring, and the set pressure of the spring can be determined. Specifically The process of obtaining the set pressure is well known to those skilled in the art) is connected with the motion push rod, when the force between the motion push rod and the piston connecting rod is equal to the set pressure of the elastic body 15psi, the pressure alarm is connected The circuit and the power supply form a closed loop, so that the pressure alarm works with electricity and outputs alarm information, so that the medical staff can determine the pressure state of the nerve block in time, avoid injuries caused by misuse, and is easy to use, safe and reliable.

Further, the connection circuit includes a negative connection line connected to the negative end of the power supply and a positive connection line connected to the positive end of the power supply, one end of the negative connection line is connected to the negative end of the power supply, and the other end is connected to the end surface of the piston rod. Connect the negative connection piece on the top, the positive connection line is connected to the positive end of the power supply, and the other end is connected to one end of the pressure alarm, and the pressure alarm is also connected to the positive connection piece on the end face of the motion push rod. When the motion push rod and the piston When the force between the connecting rods is equal to the set pressure of the elastic body of 15psi, the positive connecting piece on the end surface of the moving push rod contacts the negative connecting piece on the end surface of the piston connecting rod, so that a closed pressure alarm is formed between the pressure alarm and the power supply. circuit.

Further, a printed circuit board is arranged inside the housing, and a voice announcement module and a power supply module are integrally connected to the printed circuit board, and the power supply module is used for the pressure sensor, the pressure display screen, the voice announcement module and the connection circuit On the pressure alarm to provide electrical energy.

Further, the voice broadcast module includes a microprocessor connected to the pressure sensor and used to read the pressure value, a voice chip connected to the microprocessor, and a voice chip connected to the voice chip The sounding element controlled by the voice chip, the voice broadcast module also includes a bandpass filter connected to the voice chip and the sounding element at the same time, and the input and output ends of the bandpass filter are respectively connected to the voice chip, The sounding element is electrically connected, and the sounding element includes a loudspeaker, which reminds the doctor that the operation is critical, so as to prevent the doctor from being distracted by looking at the pressure display screen in the blink of an eye during the operation, or affecting the current operation.

Further, the power module includes a main power supply and a backup power supply, the main power supply is a rechargeable power supply, and the backup power supply is a dry battery. The main power supply can be a rechargeable storage battery such as a lithium battery, which is the main power supply equipment. When the power of the backup power supply is too low, the backup power supply can be switched to supply power for each power-consuming component.

Further, the front end of the housing is provided with a connecting wire opening, the control wires pass through the connecting wire openings and travel in the housing, and the positive connecting wires and negative connecting wires run in the housing.

Compared with prior art, advantage and positive effect of the present invention are as follows:

The operating doctor can control the forward action or reverse action of the driving mechanism through the injection button and withdrawal button on the needle handle, so as to perform injection or withdrawal, accurately position through the nerve stimulator or B-ultrasound, and puncture The needle is inserted into the positioning position, and then the handle of the needle can be operated with one hand for injection or withdrawal. Only one person can complete the nerve block anesthesia, saving manpower; it also helps the anesthesiologist understand the pressure dynamics of the injection, and provide the necessary information for the injection. situation for reference.

Description of drawings

Fig. 1 overall structure schematic diagram of the present invention;

The structural schematic diagram of Fig. 2 power plant;

The structural representation of Fig. 3 driving mechanism;

The structural representation of Fig. 4 piston rod;

Figure 5 is a collection of functional modules integrated and connected on the printed circuit board;

The meanings of the marks in Figure 1-5 are as follows: 1-needle holder, 2-needle cylinder, 3-piston rod, 4-piston handle, 5-injection catheter, 6-puncture needle, 7-needle fin, 8-housing, 9-needle fin fixing card, 10-piston handle fixing card, 11-moving slot, 12-injection button, 13-retract button, 14-control wire, 15-pressure display screen, 16-motor, 17-lead screw , 18-nut, 19-piston connecting rod, 20-elastic body, 21-motion push rod, 22-voice broadcast module, 23-power supply module, 24-microprocessor, 25-voice chip, 26-sounding element, 27 -band-pass filter, 28-main power supply, 29-backup power supply, 30-connection line port, 31-pressure alarm, 32-pressure sensor.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by "front", "rear", "inner" and "outer" are all based on the orientations or positional relationships shown in the accompanying drawings, and the target is only For the convenience of describing the present invention and simplifying the description, it is not indicated or implied that the referred components must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention.

An automatic drug injection device for nerve block, as shown in Figure 1, comprising a power unit, a syringe mounted on the power unit, and a needle handle 1;

Described syringe comprises syringe 2, the piston rod 3 that can move in described syringe 2, and the tail end of described piston rod 3 is provided with piston handle 4, and the front end of described syringe 2 passes through injection catheter 5 and puncture needle. 6 connected, and the edge of the other end is provided with a needle fin 7, and the injection catheter 5 runs inside the needle handle 1;

As shown in Figure 2, the power unit includes a housing 8, a drive mechanism arranged in the housing 8, a pin-fin fixing card 9 for fixing the syringe 2, a piston handle fixing for fixing the piston handle 4 card 10, the housing 8 is provided with a moving groove 11, the pin-fin fixing card 9 is fixedly arranged on the housing 8, and the piston handle fixing card 10 is slidably arranged on the moving groove 11;

The needle handle 1 is provided with an injection button 12 and a withdrawal button 13 , and both the injection button 12 and the withdrawal button 13 are connected to the driving mechanism through a control wire 14 . It should be understood that, in other embodiments, the injection button 12 and withdrawal button 13 on the needle handle 1 may also be wirelessly connected to the driving mechanism.

The injection device of the present invention also includes a pressure sensor 32 arranged inside the piston handle fixing card 10 for measuring the injection pressure and a pressure display screen 15 arranged on the housing 8, the pressure sensor 32 and The pressure display screens 15 are connected by electrical signals to measure the thrust of the piston handle fixing card 10 on the piston rod 3 during injection, and convert the thrust into injection pressure in combination with the size of the syringe 2 .

As shown in Figure 3, described drive mechanism comprises motor 16, leading screw 17 and the nut 18 that is arranged on the leading screw 17, and the output shaft of motor 16 is connected with leading screw 17 transmission, drives leading screw 17 to rotate, and nut 18 and piston The handle fixing card 10 is connected, the injection button 12 is connected with the forward rotation circuit of the motor 16 through the control wire 14, and the withdrawal button 13 is connected with the reverse rotation circuit of the motor 16 through the control wire 14. Apparently, the driving mechanism is not limited to the above-mentioned forms, and can also be other mechanisms that can provide linear motion, such as a linear motor or a rack and pinion.

As shown in Figure 4, the piston rod 3 is composed of a coaxially distributed piston rod 19, an elastic body 20 and a moving push rod 21, the piston connecting rod 19 is located in the syringe 2, and the moving push rod One end of 21 is connected with described piston connecting rod 19 through described elastic body 20, and the other end is fixedly connected with piston handle 4, and the corresponding end between piston connecting rod 19 and motion push rod 21 is adjacent but does not contact, and described piston A pressure alarm 31 is arranged on the outer end surface of the handle 4, and the pressure alarm 31 can be electrically connected to the power supply through a connecting circuit. When the constant pressure is 15 psi, the pressure alarm 31 forms a closed circuit by connecting the circuit and the power supply, so that the pressure alarm 31 can work with electricity and output alarm information.

When the nerve block is injected with excessive pressure of the anesthetic, the nerve will be damaged. The piston connecting rod 19 passes through the elastic body 20 (such as a spring) with a set pressure. , the process of specifically obtaining the set pressure is well known to those skilled in the art) is connected with the moving push rod 21, when the active force between the moving push rod 21 and the piston connecting rod 19 is equal to the set pressure 15psi of the elastic body 20, The pressure alarm 31 forms a closed loop by connecting the circuit with the power supply, so that the pressure alarm 31 works with electricity and outputs alarm information, so that the medical staff can determine the pressure state of the nerve block in time, avoid the injury caused by misuse, and use the operation Convenient, safe and reliable.

The connection circuit includes a negative connecting wire connected to the negative terminal of the power supply and a positive connecting wire connected to the positive terminal of the power supply, one end of the negative connecting wire is connected to the negative terminal of the power supply, and the other end is connected to the negative terminal on the end surface of the piston connecting rod. The connecting piece is connected, the positive connection line is connected with the positive end of the power supply, and the other end is connected with one end of the pressure alarm 31, and the pressure alarm 31 is also connected with the positive connecting piece on the end face of the motion push rod 21, when the motion push rod 21 is connected with When the force between the piston connecting rods 19 is equal to the set pressure of 15 psi of the elastic body 20, the positive connecting piece on the end surface of the moving push rod 21 contacts the negative connecting piece on the end surface of the piston connecting rod 19, so that the pressure alarm 31 form a closed circuit with the power supply.

During specific implementation, when the active force between the moving push rod 21 and the piston connecting rod 19 is greater than or equal to the set pressure of 15 psi of the elastic body 20, the positive connecting piece on the end face of the moving push rod 21 will connect with the end face of the piston connecting rod 19. Negative tab contact. Under normal circumstances, the elastic body 20 will not be in contact with the negative connecting piece and the positive connecting piece, and the negative connecting piece and the positive connecting piece are in a positive corresponding distribution, so that the negative connecting piece and the positive connecting piece can be in corresponding contact and realize the corresponding electrical connection state.

The housing 8 is provided with a printed circuit board, as shown in Figure 5, the printed circuit board is integrally connected with a voice broadcast module 22 and a power module 23, the power module 23 is used for the pressure sensor 32, pressure The display screen 15, the voice broadcast module 22 and the pressure alarm 31 connected to the circuit provide electric energy.

The voice broadcast module 22 includes a microprocessor 24 connected to the pressure sensor 32 and used to read the pressure value (the pressure sensor 32 is electrically connected to the input end of the microprocessor 24), and the The speech chip 25 that described microprocessor 24 is connected (the output end of described microprocessor 24 is electrically connected with the input end of described speech chip 25), and is connected with described speech chip 25 and is controlled by described speech chip 25 Sounding element 26 (the output end of described voice chip 25 is electrically connected with described sounding element 26), and described voice broadcast module 22 is used for broadcasting the injection pressure value that described pressure sensor 32 detects, and the output end of microprocessor 24 The input terminal with the voice chip 25 is specifically: the microprocessor 24 reads the injection pressure value detected by the pressure sensor 32, and the injection pressure value is in the form of a digital command, and sends it to the voice chip 25, and the voice chip 25 has a built-in A small amount of storage space, after receiving the digital instruction, store it in its ROM, then convert the digital instruction in the ROM into a voice signal, and send it to the sounding element 26, and the sounding element 26 will play the voice signal, anesthesia The doctor can then directly obtain its pressure value by listening to the voice, and the voice broadcast module 22 also includes a band-pass filter 27 connected to the voice chip 25 and the sounding element 26 simultaneously, and the input end of the band-pass filter 27 and The output ends are respectively electrically connected to the voice chip 25 and the sounding element 26. The sounding element 26 includes a loudspeaker 27, and the loudspeaker 27 reminds the doctor that the operation is critical, so as to prevent the doctor from being distracted by looking at the pressure display screen in the blink of an eye during the operation, or affecting the current situation. Operation, to remind the anesthesiologist that there is a risk of nerve damage, and the anesthesiologist then decides to continue the injection or adjust the position before injecting according to the real-time situation.

The power module 23 includes a main power supply 28 and a backup power supply 29, the main power supply 28 is a rechargeable power supply, and the backup power supply 29 is a dry battery. The main power supply 28 can be a rechargeable storage battery such as a lithium battery, and is the main power supply device. When the power of the backup power 29 is too low, the backup power 29 can be switched to supply power for each power-consuming component.

The front end of the housing 8 is provided with a connecting wire port 30, the control wire 14 runs through the connecting wire port 30 and travels in the housing 8, and the positive connecting wire and the negative electrode are routed in the housing 8. connection line.

When the present invention is in use, pre-extract the configured local anesthetic with a syringe, and fix it on the power unit, that is, the needle fin 7 of the syringe is stuck on the needle fin fixing card 9, the piston handle 4 of the syringe is stuck on the piston handle fixing card 10, and the The injection catheter 5 is set on the syringe head, and one end of the control wire 14 is inserted and passed through the connecting wire port 30 on the power unit, and the ultrasonic probe is held in one hand to display the blocking point, and the thumb and middle finger of the hand hold the needle handle, and under the guidance of the ultrasound, Operate the puncture needle tip to reach the stagnation point, press the retraction button 13 with the index finger, the piston handle fixing card 10 moves to the right, drag the piston handle 4 to move to the right, so that negative pressure is generated in the syringe 2, and observe the pressure display screen 15 on the power unit And whether there is blood returning in the injection catheter 5, if there is no blood returning, it means that the needle tip has not strayed into the blood vessel. At this time, press the injection button 12 with the index finger, and the piston handle fixing card 9 of the syringe will move to the left, and push the piston handle 4 to inject medicine. If the effect of injecting medicine is not ideal, you can adjust the position of the needle tip and repeat the above operation of withdrawing medicine and injecting medicine to achieve the ideal medicine injection effect.

The above-mentioned embodiments are only preferred implementation modes of the present invention, and any simple modifications, modifications and substitutions made to the above-mentioned embodiments according to the technical essence of the present invention fall within the scope of the technical solutions of the present invention.

Claims (9)

1. An automatic medicine injection device for nerve block is characterized by comprising a power device, an injector arranged on the power device and a needle holding handle;

The injector comprises a needle cylinder and a piston rod capable of moving in the needle cylinder, the tail end of the piston rod is provided with a piston handle, the front end of the needle cylinder is communicated with the puncture needle through a medicine injection guide pipe, the edge of the other end of the needle cylinder is provided with a needle fin, and the medicine injection guide pipe is moved in the needle holding handle;

The power device comprises a shell, a driving mechanism arranged in the shell, a pin fin fixing clamp used for fixing a needle cylinder and a piston handle fixing clamp used for fixing a piston handle, wherein the shell is provided with a moving groove;

And the needle holding handle is provided with a medicine injection button and a withdrawal button which are connected with the driving mechanism through control wires.

2. The automatic drug injection device for nerve block of claim 1, further comprising a pressure sensor disposed inside the piston stem fixing clip for measuring injection pressure and a pressure display screen disposed on the housing, wherein the pressure sensor and the pressure display screen are connected by an electrical signal.

3. The automatic drug injection device for nerve block of claim 1, wherein the driving mechanism comprises a motor, a lead screw and a nut arranged on the lead screw, an output shaft of the motor is in transmission connection with the lead screw to drive the lead screw to rotate, the nut is connected with the piston handle fixing clamp, the drug injection button is connected with a forward rotation circuit of the motor through a control lead, and the withdrawal button is connected with a reverse rotation circuit of the motor through a control lead.

4. The automatic medicine injection device for nerve block of claim 1, wherein the piston rod is composed of a piston connecting rod, an elastic body and a motion push rod which are coaxially distributed, the piston connecting rod is located in the needle cylinder, one end of the motion push rod is connected with the piston connecting rod through the elastic body, the other end of the motion push rod is fixedly connected with the piston handle, a pressure alarm is arranged on the outer end face of the piston handle, the pressure alarm can be electrically connected with a power supply through a connecting circuit, and when the acting force between the motion push rod and the piston connecting rod is equal to the set pressure of the elastic body of 15psi, the pressure alarm forms a closed loop with the power supply through the connecting circuit, so that the pressure alarm works electrically and outputs alarm information.

5. the automatic drug injection device for nerve block of claim 4, wherein the connection circuit comprises a negative connection line connected to the negative terminal of the power supply and a positive connection line connected to the positive terminal of the power supply, one end of the negative connection line is connected to the negative terminal of the power supply, and the other end is connected to the negative connection pad on the end face of the piston rod, the positive connection line is connected to the positive terminal of the power supply, and the other end is connected to one end of the pressure alarm, the pressure alarm is further connected to the positive connection pad on the end face of the motion push rod, and when the acting force between the motion push rod and the piston rod is equal to the set pressure of the elastic body of 15psi, the positive connection pad on the end face of the motion push rod contacts with the negative connection pad on the end face of the piston rod, so that a closed loop is.

6. the automatic drug injection device for nerve block of claim 4, wherein a printed circuit board is disposed in the housing, a voice broadcast module and a power module are integrally connected to the printed circuit board, and the power module is used for providing electric energy for the pressure sensor, the pressure display screen, the voice broadcast module and a pressure alarm on the connection circuit.

7. the automatic medicine injection device for nerve block of claim 6, wherein the voice broadcast module includes with the pressure sensor connect and be used for reading the microprocessor of pressure value, with the pronunciation chip that microprocessor connects, and with the pronunciation chip connect and by the vocal component of pronunciation chip control, the voice broadcast module still include simultaneously with the band-pass filter that pronunciation chip, vocal component are connected, band-pass filter's input and output respectively with pronunciation chip, vocal component electricity are connected, vocal component includes the speaker.

8. the automatic drug injection device for nerve block of claim 1, wherein the power module comprises a main power supply and a backup power supply, the main power supply is a rechargeable power supply, and the backup power supply is a dry battery.

9. The automatic drug injection device for nerve block of claim 5, wherein the front end of the housing is provided with a connection port, the control wire passes through the connection port and runs in the housing, and the positive connection wire and the negative connection wire run in the housing.