WO2009125879A1

WO2009125879A1 - Automatic injection apparatus

Info

Publication number: WO2009125879A1
Application number: PCT/KR2008/001955
Authority: WO
Inventors: Jong-Soo Choi
Original assignee: Jong-Soo Choi
Priority date: 2008-04-07
Filing date: 2008-04-07
Publication date: 2009-10-15

Abstract

An automatic injection apparatus is disclosed, which is capable of injecting an injection liquid in multiple portions during a shorter time by engaging an injector having a certain injection liquid. The automatic injection apparatus comprises a gun-shaped body having an operation switch in its handle, with an injector support having an injector being movable along its upper side, an injector transportation unit which allows an injector support to reciprocate by using a step motor, a piston transportation unit which allows an injection liquid in the injector to be injected by moving a piston, a battery which is detachably installed in the body for supplying power to the injector transportation unit and the piston transportation unit, and a control and display unit for controlling and displaying the operations of the injector transportation unit and the piston transportation unit.

Description

Title: AUTOMATIC INJECTION APPARATUS

Technical Field

The present invention relates to a gun-shaped automatic injection apparatus, and in particular to an automatic injection apparatus which is constructed to be capable of injecting an injection liquid into multiple portions during a shorter time by engaging an injector having a certain injection liquid.

Background Art Mesotherapy is a therapy method, which was developed by Dr. Pistor in

France in 1952, and is widely used in the EU as well as in a South America continent. In the above method, a skin layer and subcutaneous are injected using a specially designed injection mechanism and a very thin injection needle. The mesotherapy is generally used for treating an acute and chronic pain and partial obesity and for enhancing a blood circulation and a lymph circulation in a portion injected for a beauty operation while preventing various pains and partial fatting, removing skin wrinkles, preventing skin aging, and increasing a skin flexibility along with its faster effects and less side effects. With its above advantages, it has been widely used in recent years. In the mesotherapy, an operation control should be precisely performed by means of hands, depending on a thickness of a needle, an injection depth and angle, an injection amount and an operation portion. In case that an operator inputs a certain amount of liquid medicine into a disposable type injector, and manually injects into an operation portion, a lot of time is consumed due to a long time operation. In addition, many inconveniences occur due to an over fatigue. So, a mesogun or an injection gun is widely used as a means for injecting a liquid medicine.

Figure 1 is a schematic view illustrating a conventional automatic injection apparatus.

As shown in Figure 1 , the conventional automatic injection apparatus comprises a gun shaped body(not shown) having an operation switch(not shown) in a handle, with an injector support unit 111 having an injector 103 being movable on an upper side of the body, an injector transportation unit 120 which is installed in the body and reciprocates the injector support unit 111 depending on an operation of the operation switch, and a piston transportation unit 130 which is installed in the body and reciprocates the injector support unit 111 depending on an operation of the operation switch for thereby injecting an injection liquid.

Here, the injector transportation unit 120 comprises a solenoid 121 which moves forward and backward a shaft 123 depending on the supply of a current, and a support unit holder 127 which is connected with the injector support unit 111 and is elastically supported by means of a spring 125 and reciprocates forward and backward the injector support unit with the helps of an impellent force of the shaft 124 by means of the solenoid 121 and an elastic force of the spring 125. The injector transportation unit 120 is a straight reciprocation mechanism implemented by using the solenoid 121. The injector transportation unit 120 is capable of generating a faster driving force and a stronger driving force than a motor, but has a disadvantage in that a torque is small during reciprocation. In case of the conventional automatic injection apparatus 100, there is further provided an injection depth adjusting unit 140 for adjusting an injection depth by moving a skin contactor 143 while adjusting a dial 141 of the conventional automatic injection apparatus 100. In this case, the construction does not look good, and a precise control is difficult since it is needed to manually rotate the dial with hands.

In case that the conventional automatic injection apparatus 100 is implemented in a motor driving method, the whole weight increases, so it is hard for an operator to work for a longer time. It is disadvantageous that the power consumption increases. So, it cannot be implemented in a portable battery-mounted structure. Since the whole volume increases as well, a compact construction cannot be obtained. Since the motor 131 of the piston transportation unit 130 is engaged in the injector transportation unit 120, it reciprocates integrally along with the injector transportation unit 120, so lots of vibrations and noises occur during its operation. In addition, when an injector needle is inserted into a skin with the helps of the operations of the injector transportation unit 120 and the piston transportation unit 130 and is pulled out of the skin, an expensive injection liquid may leak from the injector 103 by means of an internal pressure, so the injection liquid may lose, which leads to increasing the total cost. Various operation keys are provided for controlling the operations of the injector transportation unit 120 and the piston transportation unit 130, so the operations are not easy and complicated.

Disclosure of Invention Accordingly, it is an object of the present invention to provide an automatic injection apparatus in which a forward and backward transportation of an injector and a piston can be simply implemented, and the whole weight and volume can be minimized.

It is another object of the present invention to provide an automatic injection apparatus which is constructed to minimize vibrations and noises during its operation.

It is further another object of the present invention to provide an automatic injection apparatus in which when an injector needle is pulled out after it is inserted into a skin, an expensive injection liquid does not leak for thereby preventing the loss of an injection liquid and the increase of cost.

To achieve the above objects, in an automatic injection apparatus which is able to inject an injection liquid into many portion during a shorter time by engaging an injector with a certain injection liquid, there is provided an automatic injection apparatus which comprises a gun shaped body which has an operation switch in a handle with an injector support unit having an injector being movably disposed on an upper side of the body; an injector transportation unit which is installed in the body and is engaged to the injector support unit and reciprocates the injector support unit by using a step motor; a piston transportation unit which is installed in the body and is engaged to a piston of the injector and injects an injection liquid from the injector by moving the piston; a battery which is detachably disposed in the body and supplies an electric power to the injector transportation unit and the piston transportation unit, respectively; and a control and display unit which is installed in a backside of the body and controls and displays the operations of the injector transportation unit and the piston transportation unit. The injector transportation unit includes a first step motor which is fixed in the body; a first lead screw which is rotatably engaged to a shaft of the first step motor; and a support unit holder which is movably engaged to the first lead screw and moves forward and backward along the first lead screw when the first step motor rotates in normal or reverse direction, with its upper side being fixed in the injector support unit, for thereby allowing the injector support unit to move forward and backward.

The piston transportation unit includes a second step motor which is installed in the body; a second lead screw which is rotatably engaged to a shaft of the second step motor and passes through the injector support unit and is rotatably supported by the same; and a piston holder which is movably engaged to the second lead screw and moves forward and backward along the second lead screw as the second step motor rotates in normal or reverse direction, with its upper side being engaged to a rear end of the piston, for thereby allowing the piston to move forward and backward.

The control and display unit includes an operation button which is installed on the body; a control panel which is installed in the body and controls the operations of the injector transportation unit and the piston transportation unit in accordance with the operations of the operation switch and the operation button; and a display panel which is installed on the body and displays an operation state in accordance with a control of the control panel.

The control panel is constructed to further reverse-rotates the second step motor of the piston transportation unit as compared to the first step motor of the injector transportation unit when an injection needle of the injector is pulled out of a skin, so that an injection liquid stored in the injector does not leak to the outside.

To achieve the above objects, in an automatic injection apparatus which is able to inject an injection liquid into many portion during a shorter time by engaging an injector with a certain injection liquid, there is provided an automatic injection apparatus which comprises a gun shaped body which has an operation switch in a handle with an injector support unit having an injector being movably disposed on an upper side of the body; an injector transportation unit which is installed in the body and reciprocates the injector support unit by using the rotation of a cylindrical cam which is engaged to the injector support unit and has a slanted closed curve groove in its outer surface; a piston transportation unit which is installed in the body and is engaged to a piston of the injector and injects an injection liquid from the injector by moving the piston; a battery which is detachably disposed in the body and supplies an electric power to the injector transportation unit and the piston transportation unit, respectively; and a control and display unit which is installed in a backside of the body and controls and displays the operations of the injector transportation unit and the piston transportation unit.

The injector transportation unit includes a motor which is installed in the body; a cylindrical cam which is fixed in a shaft of the motor and is integrally rotated and has a slanted closed curve groove on its outer surface; and a support unit holder which moves forward and backward along the slanted closed curve groove as the motor rotates for thereby allowing the injector support unit to move forward and backward with its lower side being movably engaged to the slanted closed curve groove of the cylindrical cam, and with its upper side being fixed in the injector support unit. Brief Description of the Drawings

The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein; Figure 1 is a schematic view illustrating a conventional automatic injection apparatus;

Figure 2 is a side view illustrating an automatic injection apparatus according to the present invention;

Figure 3 is a schematic cross sectional view illustrating an automatic injection apparatus according to the present invention;

Figure 4 is a view illustrating an injector transportation unit and a piston transportation unit of an automatic injection apparatus according to the present invention;

Figure 5 is a view illustrating another structure of an injector transportation unit of an automatic injection apparatus according to the present invention; and

Figure 6 is a view illustrating a control and display unit of an automatic injection apparatus according to the present invention.

Effects

According to an automatic injection apparatus according to the present invention, an operator can easily operate while carrying it by installing a battery in a portable gun-shaped body.

The whole weight and volume can be significantly decreased by adapting a straight reciprocation motion in an injector transportation unit and a piston transportation unit with the help of a step motor. So, vibrations and noises occurring due to a reciprocation of an injector can be minimized.

In the operations of an injector transportation unit and a piston transportation unit, when an injection needle is pulled out of a skin, a motor is further reverse-rotated for driving a piston transportation unit, so that an expensive injection liquid does not leak from an injector for thereby preventing the loss of an injection liquid and the increase of the whole cost.

Since various operation modes can be set depending on an operation button, it is possible to easily adjust the number of injections and the injection amount of injection liquid per shot at one time.

Best Mode for Carrying Out the Invention

Figure 2 is a side view illustrating an automatic injection apparatus according to the present invention. Figure 3 is a schematic cross sectional view illustrating an automatic injection apparatus according to the present invention. Figure 4 is a view illustrating an injector transportation unit and a piston transportation unit of an automatic injection apparatus according to the present invention. Figure 5 is a view illustrating another structure of an injector transportation unit of an automatic injection apparatus according to the present invention. Figure 6 is a view illustrating a control and display unit of an automatic injection apparatus according to the present invention.

The automatic injection apparatus 1 according to the present invention is constructed to inject an injection liquid into many portions during a shorter time by engaging an injector having an injection liquid and as shown in Figures 2 through 6 comprises a gun shaped body 10 having an operation switch 13 at its handle with an injector support unit 11 having an injector 3 being movable on an upper side of the same, an injector transportation unit 20 which is installed in the body 10 and is engaged to the injector support unit 11 and reciprocates the injector support unit 11 by using a step motor 21 , a piston transportation unit 30 which is installed in the body 10 and is engaged to the piston 5 of the injector 3 and transports the piston 5 for thereby injecting an injection liquid stored in the injector 3, a battery 40 which is detachably disposed in the body 10 and provides power to the injector transportation unit 20 and the piston transportation unit 30, respectively, and a control and display unit 50 which is installed in a backside of the body 10 and controls and displays the operations of the injector transportation unit 20 and the piston transportation unit 30.

Here, the body 10 forms a frame of the automatic injection apparatus 1 according to the present invention and is formed in a gun shape, so a user can use it while holding the same. The injector support unit 11 having an injector 3 is movably disposed on an upper side of the body 10, and an operation switch 13 is provided in the handle of the body 10, namely, a trigger portion of the same for controlling an operation and stop of the automatic injection apparatus 1 according to the present invention.

An injector holder 11a is disposed in the injector support unit 11 for actually holding the injector, and an injector holder adjusting unit 11b is disposed in the body 10 for adjusting a holding state of the injector 3 by adjusting the interval of the injector holder 11a.

A skin contactor 15 is disposed on a front surface of the body 10, and a skin contactor adjusting unit 15a is disposed at one side of the body 15 for adjusting the position of the skin contactor 15. An injector transportation unit 20 is provided in the interior of the body 10 for reciprocating the injector support unit 11 while being engaged with the injector support unit 11. As shown in Figure 3, the injector transportation unit 20 comprises a first step motor 21 installed in the body 10, a first lead screw 23 which is engaged to a shaft of the first step motor 21 , and a support unit holder 25 which is movably engaged to the first lead screw 23 and moves forward and backward along the first lead screw 23 when the first step motor 21 rotates in normal or reverse direction, with its upper side being fixed in the injector support unit 11 , and moves forward and backward the injector support unit 11. The first step motor 21 installed in the body 10 rotates in normal or reverse direction depending on a pulse type control signal of the control and display unit 50 for thereby rotating the first lead screw 23. The step motor(called as stepping motor, stepper motor, pulse motor, etc) is capable of converting into a mechanical axial motion in accordance with a pulse type control signal of the control and display unit 50. It is advantageous to precisely controlling an angle as compared to an AC servo motor, a DC servo motor, etc. The shaft of the step motor rotates at a set angle depending on the number of pulses. When the interval of pulses is properly adjusted, it is possible to properly control a driving method and speed of an object which will be controlled. The step motor directly controls an open loop with a digital signal, so the entire system is simplified. Since a rotation speed proportional to a frequency of a pulse signal can be obtained, a wider speed control can be performed. Driving, stop, normal and reverse rotation and transformation are easy. A response characteristic is excellent. A rotation angle of a motor is in proportion to the number of input pulses, and the speed of a motor is in proportion to the number of input pulses for one second, and an angle error per one step is within +5%. Since the error of a rotation angle is not accumulated for each step, it is easy control the same. A high torque can be obtained at a lower speed. The step motor does not need a brush and fewer parts, so the product is reliable, and a feedback for detecting a rotation angle is not advantageously needed.

The first lead screw 23 directly connected to the shaft of the first step motor 21 is capable of converting a rotational motion of the step motor 21 into a straight reciprocation motion and is rotatably supported by means of the bearings in the body 10. The support unit holder 25, which is movably engaged to the first lead screw 23 with its upper side being fixed in the injector support unit 11 , moves forward or backward along the first lead screw 23 when the first step motor 21 rotates in normal or reverse direction for thereby moving forward or backward the injector support unit 11. The injector transportation unit 20 adapts the step motor 21 , so the entire weight and volume can be decreased for thereby enhancing portability. In addition, a more compact size product can be manufactured, and it should be appreciated that the vibrations and noises can be minimized when the injector 3 reciprocates as the whole weight is decreased. The injector transportation unit 20 may be constructed with various linear motor mechanisms, which are capable of implementing a straight reciprocation motion. Figure 5 shows another embodiment of the injector transportation unit 20'.

The injector transportation unit 20' reciprocates the injector support unit 11 reciprocates with the help of a rotation of a cylindrical cam 23' having a slanted closed curve groove 23a' in its outer surface. As shown in Figure 5, the injector transportation unit 20' comprises a motor 21' installed in the body 10, a cylindrical cam 23' fixed in the shaft of the motor 21' and integrally rotating with the same and having a slanted closed curve groove 23a' in its outer surface, and a support unit holder 25' of which its lower end is movably engaged to a slanted closed curve groove 23a of the cylindrical cam 23, and its upper end is fixed in the injector support unit 11 , so it moves forward and backward along the slanted closed curve groove 23a' when the motor 21 ' rotates.

In case of the injector transportation unit 20', the support unit holder 25' engaged to the injector support unit 11 moves along the slanted closed curve groove 23a' of the cylindrical cam 23' rotating with the help of a rotation of the motor 21' for thereby reciprocating the injector support unit 11. The rotation motion of the motor 21' is converted into a straight reciprocation motion by means of the cylindrical cam 23. A piston transportation unit 30 is installed in the body 10. The piston transportation unit 30 is engaged to the piston 5 of the injector 3 and moves the piston 5 along with the movement of the injector support unit 11 by means of the injector transportation unit 20, so an injection liquid stored in the injector 3 is injected into a skin or a body. As shown in Figure 3, the piston transportation unit 30 comprises a second step motor 31 installed in the body 10, a second lead screw 33 which is rotatably fixed in the shaft of the second step motor 31 and rotatably passes through the injector support unit 11 , and a piston holder 35 which moves forward and backward along the second lead screw 33 as the second step motor 31 rotates in normal or reverse direction for thereby moving forward and backward the piston 5, with its one side being movably engaged to the second lead screw 33, and with the other end of the same being engaged to a rear end of the piston 5.

The second step motor 31 installed in the body 10 rotates in normal or reverse direction in accordance with a pulse type control signal of the control and indication unit 50 for thereby rotating the second lead screw 33.

The second lead screw 33 directly engaged to the shaft of the second step motor 31 converts a rotational motion of the second step motor 31 into a straight reciprocation motion and is rotatably supported by means of the injector support unit 11 as it passes through the injector support unit 11. The piston holder 35 movably engaged to the second lead screw 33 and at the same time engaged to a rear end of the piston 5 moves forward and backward along the second lead screw 33 as the second step motor 31 rotates in normal or reverse direction for thereby moving forward and backward the piston 5. The piston holder 35 is contact-supported by means of a backside of the rear end of the piston 5 with a rotation grip 35a positioned in a front side of the rear end of the piston being hinged at an upper side of the piston holder 35.

In case of the automatic injection apparatus 1 according to the present invention, as the rotation angle of the motors of the injector transportation unit 20 and the piston transportation unit 30 are in proportion to the number of input pulses, and the speed of the motor is in proportion to the number of input pulses for one second, and the step motors 21 and 31 are adapted, which can be precisely controlled with the help of fewer angle errors per one step, it is possible to easily control the insertion depth of the injector needle. So, in the present invention, the construction of the injection depth adjusting unit is not needed like in the conventional art, and the whole construction is simplified, and the whole weight can be significantly decreased.

The battery 40 is detachably disposed in the body 10 and supplies power to the injector transportation unit 20 and the piston transportation unit 30, respectively. Here, the battery 40 is preferably made of a chargeable lithium ion battery. Various chargeable batteries can be used. It is preferred that the battery

40 is detachably installed in a rear lower side of the body 10.

Since an additional power cable is not needed in the construction of the battery 40 according to the present invention, a product portability and use convenience are enhanced.

The control and display unit 50 is installed in a backside of the body 10 and controls the operations of the injector transportation unit 20 and the piston transportation unit 30 and comprises an operation button 51 installed in the body 10, a control panel 53 which controls the operations of the injector transportation unit 20 and the piston transportation unit 30 depending on the operations of the operation switch 13 and the operation button 51 , and a display panel 55 which is installed on the body 10 for displaying the operations states in accordance with a control of the control panel 53.

With the operation button 51 , it is possible to control the kinds of injector or medicine, an injection mode and an injection amount. Various operation states such as the kind of medicine, an operation mode, a medicine injection amount, and a charged level of a battery selected depending on the amounts of injectors(1cc, 10cc, etc) as a certain input signal is inputted through the operation button 51 , are formed in the display panel 55. In case of the medicine injection amount, the injection amounts such as 1cc per 60 seconds, 1cc per 42 seconds, 1cc per 3 seconds, 1cc per 18 seconds, 1cc per 2 seconds or something can be selected depending on the injection amount per unit time when the medicine is injected in consecutive order. The control panel 53 includes a printed circuit board which receives a control signal inputted through the operation switch 13 and the operation button 51 and allows the injector transportation unit 20 and the piston transportation unit 30 to operate in a certain operation mode, respectively.

The operation mode set by the operation button 51 and the control panel 53 is classified into a continuous mode, a Dose mode, a Nappage mode and a filler mode. Here, in the continuous mode, a medicine is continuously supplied while the operation switch 13 is being pressed, and the Dose mode is a single mode in which the injection amount of medicine is set whenever injection is performed one time, namely, even when the operation switch 13 keeps being pressed, a set amount of injection medicine is injected, and then it stops. In the Nappage mode, the injector injects while repeatedly moving forward and backward as the operation switch 13 keeps being pressed. Here, the number of forward and backward movements per one second is 1 through 6 times, and in the filler mode, it does not have a forward and backward movement function of the injector 3. It is used when a very precise operation is needed. Various operation modes can be used depending on a desired purpose.

W/hen the needle of the injector 3 is pulled out of the skin, the control panel 53 allows the second step motor of the piston transportation unit 30 to further reverse-rotate as compared to the first step motor 21 of the injector transportation unit 20, so that an injection liquid does not leak from the injector 3. When the injection needle is pulled out of the skin, the injector 3 and the piston 5 move backward by means of the injector transportation unit 20 and the piston transportation unit 30. In this case, since the injection liquid may be discharged by means of the pressure applied to the piston 5 including the internal pressure of the injector 3, it is needed to further rotate the second step motor 31 of the piston transportation unit 30 for thereby removing the internal pressure of the injector 3, so the injection liquid stored in the injector 3 does not leak to the outside.

The display panel 55 displays the operation states of the injector transportation unit 20 and the piston transportation unit 30 in accordance with a control of the control panel 53. As shown in Figure 6, it is preferably made of a single LCD panel for displaying various states such as the kind of medicine, an operation mode, a medicine injection amount and a charged level of a battery depending on the capacity(1cc, 10cc, etc) of the injector or viscoelastic. The operation of the automatic injection apparatus 1 according to the present invention will be described.

First, the operation mode, the injection number, an injection amount per time, an injection depth or something are set through the operation button 51 , and the operator holds the body 10. The skin contactor 15 of the body 10 is contacted with a portion to be injected, and then the operation switch 13 is pressed. So, the injector transportation units 20 and 20' and the piston transportation unit 30 are operated in accordance with a control of the control panel 63.

In other words, as the first step motor 21 rotates in normal or reverse direction, the first lead screw 23 rotates. As the first lead screw 23 rotates, the support holder 25 engaged to the injector support unit 11 moves forward and backward along the first lead screw 23 while allowing the injector support unit 11 to move forward and backward. The cylindrical cam 23' rotates along with the rotation of the motor 21'. As the cylindrical cam 23' rotates, the support unit holder 25' engaged to the injector support unit 11 moves along the closed curve groove 23a' formed in an outer surface of the cylindrical cam 23' while allowing the injector support unit 11 to move forward and backward, so that the injection needle moves forward or backward in the portion to be injected.

At the same time, as the second step motor 31 rotates in normal or reverse direction, the second lead screw 33 rotates. As the second lead screw 33 rotates, the piston holder 35 engaged to the piston 5 moves forward and backward along the second lead screw 33 while allowing the piston to move forward and backward with respect to the injector. So, an injection liquid is injected into a portion as the injector support unit 11 moves forward. In particular, when the injection needle is pulled out of the skin, it is preferred that the second step motor 31 further reverse-rotates as compared to the first step motor 21, so that the injection liquid stored in the injector 3 does not leak.

The operator is able to control the operation of the automatic injection apparatus 1 according to the present invention while checking the current operation mode through the display panel 55. Even in a state that the operation is stopped through the operation switch 13, it is possible to set another operation mode with the operation button 51.

As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

Claims:

1. In an automatic injection apparatus which is able to inject an injection liquid into many portion during a shorter time by engaging an injector with a certain injection liquid, an automatic injection apparatus, comprising: a gun shaped body which has an operation switch in a handle with an injector support unit having an injector being movably disposed on an upper side of the body; an injector transportation means which is installed in the body and is engaged to the injector support unit and reciprocates the injector support unit by using a step motor; a piston transportation means which is installed in the body and is engaged to a piston of the injector and injects an injection liquid from the injector by moving the piston; a battery which is detachably disposed in the body and supplies an electric power to the injector transportation means and the piston transportation means, respectively; and a control and display means which is installed in a backside of the body and controls and displays the operations of the injector transportation means and the piston transportation means.

2. The apparatus of claim 1 , wherein said injector transportation means includes: a first step motor which is fixed in the body; a first lead screw which is rotatably engaged to a shaft of the first step motor; and a support unit holder which is movably engaged to the first lead screw and moves forward and backward along the first lead screw when the first step motor rotates in normal or reverse direction, with its upper side being fixed in the injector support unit, for thereby allowing the injector support unit to move forward and backward.

3. The apparatus of claim 1 , wherein said piston transportation means includes: a second step motor which is installed in the body; a second lead screw which is rotatably engaged to a shaft of the second step motor and passes through the injector support unit and is rotatably supported by the same; and a piston holder which is movably engaged to the second lead screw and moves forward and backward along the second lead screw as the second step motor rotates in normal or reverse direction, with its upper side being engaged to a rear end of the piston, for thereby allowing the piston to move forward and backward.

4. The apparatus of claim 1 , wherein said control and display means includes: an operation button which is installed on the body; a control panel which is installed in the body and controls the operations of the injector transportation means and the piston transportation means in accordance with the operations of the operation switch and the operation button; and a display panel which is installed on the body and displays an operation state in accordance with a control of the control panel.

5. The apparatus of claim 4, wherein said control panel is constructed to further reverse-rotates the second step motor of the piston transportation means as compared to the first step motor of the injector transportation means when an injection needle of the injector is pulled out of a skin, so that an injection liquid stored in the injector does not leak to the outside.

6. In an automatic injection apparatus which is able to inject an injection liquid into many portion during a shorter time by engaging an injector with a certain injection liquid, an automatic injection apparatus, comprising: a gun shaped body which has an operation switch in a handle with an injector support unit having an injector being movably disposed on an upper side of the body; an injector transportation means which is installed in the body and reciprocates the injector support unit by using the rotation of a cylindrical cam which is engaged to the injector support unit and has a slanted closed curve groove in its outer surface; a piston transportation means which is installed in the body and is engaged to a piston of the injector and injects an injection liquid from the injector by moving the piston; a battery which is detachably disposed in the body and supplies an electric power to the injector transportation means and the piston transportation means, respectively; and a control and display means which is installed in a backside of the body and controls and displays the operations of the injector transportation means and the piston transportation means.

7. The apparatus of claim 6, wherein said injector transportation means includes: a motor which is installed in the body; a cylindrical cam which is fixed in a shaft of the motor and is integrally rotated and has a slanted closed curve groove on its outer surface; and a support unit holder which moves forward and backward along the slanted closed curve groove as the motor rotates for thereby allowing the injector support unit to move forward and backward with its lower side being movably engaged to the slanted closed curve groove of the cylindrical cam, and with its upper side being fixed in the injector support unit.