JP4489886B2 - Dental automatic syringe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention Dental In connection with automatic injectors, improve operability especially by reducing size and weight Dental It relates to an automatic syringe.
[0002]
[Prior art]
Conventionally, when a doctor treats a patient in a hospital or the like, for example, when a dentist treats a patient's teeth by injecting anesthesia, a dental syringe is used. This syringe is provided with a cartridge in which a chemical solution is sealed, a needle is provided on the front end side of the cartridge, and a piston that is pressed and moved on the rear end side of the cartridge so as to push out the chemical solution of the cartridge from the needle. . However, the needle of this dental syringe has a very small diameter unlike the needle of the upper arm syringe.
[0003]
For this reason, the dentist requires a great deal of force when using an anesthetic syringe. For example, when slowly injecting about 0.25 ml of chemical solution (anesthetic) per minute, the force pushing the piston requires 12 kgf or more. Therefore, the injection work has given the dentist great effort and stress. It was also painful for the patient because the dentist was working under great effort and stress.
[0004]
In order to solve this problem, an automatic syringe combined with an electric motor, a gear mechanism, or the like is used as a dental syringe.
[0005]
[Problems to be solved by the invention]
However, the conventional automatic dental syringe is configured by combining an electric motor, a gear mechanism, etc., so that the overall weight is increased and a heavy burden is imposed on the doctor, and the needle tip is made delicate. It becomes difficult to control, so that it is impossible to inject the liquid medicine stably, and it is necessary for the dentist to hold the syringe for a certain period of time. There was an inconvenience that it caused more pain than the case.
[0006]
[Means for Solving the Problems]
Therefore, in order to eliminate the above-mentioned inconvenience, the present invention firstly provides a cartridge in which a chemical solution is enclosed, a needle is provided on the tip side of the cartridge, and the chemical solution in the cartridge is pushed out from the needle. A piston that is pressed and moved on the rear end side of the cartridge is provided. Dental In an automatic syringe, it expands and contracts when a voltage is applied Polarized There are three or more piezoelectric elements and one side of this piezoelectric element. It consists of one metal member that is elastically deformed A drive structure comprising a base member and an electrode provided on the other side of the piezoelectric element is provided to bend when an AC voltage is applied to the piezoelectric element, and the distortion operation of the drive structure is linearly operated. One side of the driver element to be converted into the base member is provided on the base member, and is urged by an elastic member formed in a wave shape so as to press the driver element against the base member and contacts the other side of the driver element. A moving member that linearly moves by the operation of the driver to press and move the piston is provided, and the moving member returns to the original position by inverting the phase of the AC voltage applied to the piezoelectric element. To do.
[0007]
Second, a cartridge in which a chemical solution is sealed is provided, a needle is provided on the front end side of the cartridge, and a piston that is pressed and moved on the rear end side of the cartridge so as to push out the chemical solution of the cartridge from the needle is provided. Dental Ring shape in automatic syringe It consists of one metal member that elastically deforms The base member is arranged in the circumferential direction of the base member and expands and contracts when a voltage is applied Polarized A drive structure comprising a plurality of piezoelectric elements and electrodes provided on the piezoelectric elements is provided that is distorted when a voltage is applied to the piezoelectric elements, and an AC voltage is applied to the piezoelectric elements to provide the drive structure. A ring-shaped rotating member that rotates when the member is distorted is provided in contact with the base member, and an elastic member that presses the rotating member against the base member is provided. The rotating member is provided with a rotating shaft via a joint mechanism. And a rod that moves linearly by the rotation of the rotating shaft to press and move the piston, and the rotating member reverses the phase of the AC voltage applied to the piezoelectric element to restore the original It is characterized by returning to the position.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Since this invention uses a piezoelectric element as a power source for injecting a chemical solution, the electromagnetic force of a motor or the like is reduced. use This eliminates the need for heavy parts such as coils, magnets, and electromagnetic steel sheets, making it smaller and lighter overall, improving operability, reducing the labor required for the doctor, It is easy to finely control the needle tip by concentrating the needle tip, which makes it possible to slowly advance the needle tip according to the injection state of the chemical solution, and to stably inject the chemical solution, In addition, the needle tip can be inserted straight only into the tissue infiltrated with the chemical solution, so that a force from the lateral direction is applied to the needle tip, and the tissue not infiltrated with the chemical solution in this direction is not stimulated. Therefore, there is no pain in the patient, and moreover, since the liquid medicine is constantly discharged from the needle tip as much as in the case of a manual syringe, tissue destruction is not caused by excessive discharge of the liquid medicine. Always Since the liquid is ejected, even if the needle tip reaches the nerve fiber, the nerve fiber escapes from the needle tip, and the nerve fiber is not torn, pain does not occur, and patient pain is reduced. Can be made.
[0009]
【Example】
Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 11 show a first embodiment of the present invention. In FIG. 1, 2 is an automatic syringe for anesthesia used by a dentist. The automatic injector 2 includes a main body case 4, a cartridge cover 6, a needle holder 8, and an end case 10.
[0010]
The main body case 4 is formed in a cylindrical shape, and is arranged on the front end surface of the main body side step wall portion 14 and the main body side step wall portion 14 which is directed radially inward on the front end side to form the main body side insertion hole 12. And a main body front end side connecting portion 18 having a main body front end side screw portion 16 formed on the outer peripheral surface thereof in the axial direction, and a main body rear end side screw portion 20 is formed on the inner peripheral surface on the rear end side. The main body rear end side connecting portion 22 and the retaining piece holding groove 24 inside the main body rear end side connecting portion 22 are provided. The locking piece holding groove 24 holds a locking piece 26 directed radially inward.
[0011]
The cartridge cover 6 has a rear cover side screw portion 28 that is screwed to the main body front end side screw portion 16 of the main body front end side connecting portion 18 on the rear end side, and is formed on the inner peripheral surface. An end-side connecting portion 32, a cover-side step wall 36 that forms a cover-side needle insertion hole 34 that is directed radially inward on the tip side, and a shaft that is continuous with the tip surface of the cover-side step wall 36 And a cover front end side connecting portion 40 having a cover front end side screw portion 38 formed on the outer peripheral surface thereof.
[0012]
The needle holder 8 includes a holder-side connecting portion 44 in which a holder-side screw portion 42 that is screwed onto the cover tip-side screw portion 38 of the cover tip-side connecting portion 40, a seal member hole 46, and a holder-side needle insertion hole. And a needle holding part 50 formed with 48. The seal member hole 46 is provided with a seal member 52 that seals with the cover distal end side connecting portion 38. The seal member 52 is formed with a seal side needle insertion hole 54.
[0013]
The end case 10 includes an end-side connecting portion 58 having an end-side screw portion 56 formed on the outer peripheral surface so as to be screwed to the main body rear-end-side screw portion 20 of the main body rear-end-side connecting portion 22, and a cord housing inside A hole 60 and a cord insertion hole 62 are provided.
[0014]
The cartridge cover 6 contains a cartridge 64 in which a chemical solution is enclosed. The cartridge 64 includes a syringe part 66 and a sealing member 68 on the distal end side of the syringe part 66. A piston 70 slidable in the syringe part 66 is provided on the rear end side of the syringe part 66. The piston 70 is provided with an O-ring 74 that seals in contact with the inner peripheral surface of the syringe portion 66 in a ring groove 72 on the outer peripheral surface.
[0015]
A needle 76 is inserted through the cover side needle insertion hole 34, the holder side needle insertion hole 48, and the seal side needle insertion hole 54. The rear end side of the needle 76 is pierced by the sealing member 68 so as to protrude into the cylinder portion 66.
[0016]
In the main body case 4, as shown in FIG. 1, a plurality of, for example, four first to fourth driving components 78-1 to 78-4 and these first to fourth driving components 78-1 to 78- 1 to 4 driver elements 80-1 to 80-4 corresponding to 4, a moving member 82 in contact with these first to fourth driver elements 80-1 to 80-4, and an elastic member that presses the moving member 82. A spring material 84 is provided.
[0017]
As shown in FIG. 6, the drive structure 78 is provided on at least one piezoelectric element 86 that expands and contracts when a voltage is applied, a base member 88 provided on one side surface of the piezoelectric element 86, and the other side surface of the piezoelectric element 86. 7 and 8, when an AC voltage as a voltage is applied to the piezoelectric element 86, that is, when the timing of the voltage applied to the piezoelectric element 86 is controlled, a distortion operation is performed as shown in FIGS. The moving member 82 is moved back and forth.
[0018]
As shown in FIG. 2A, the piezoelectric element 86 has been subjected to polarization treatment, and is composed of, for example, three first to third piezoelectric elements 86A to 86C, and continuously expands and contracts when an AC voltage is applied. To do. The base member 88 is one metal member that is elastically deformed, and includes first to third base members 88A to 88C corresponding to the first to third piezoelectric elements 86A to 86C. As the material, for example, a metal such as aluminum or copper is used. However, phosphor bronze is suitable as a material for the stator elastic body in terms of wear resistance and vibration temperature characteristics. This phosphor bronze is an alloy in which a small amount of phosphorus is added to tin bronze, and a typical material is a spring material in which about 0.2% phosphorus is added to Cu92, Sn8%. The electrode 90 includes first to third electrodes 90A to 90C corresponding to the first to third base members 88A to 88C.
[0019]
The driver element 80 converts the distorting operation of the driving structure 78 into a linear operation, and one side is provided at a substantially central portion of the outer surface of the central second base member 88B.
[0020]
The moving member 82 is made of a member having wear resistance, is urged by the spring member 84 so as to press the driving element 80 against the second base member 88B, and comes into contact with the other side of the driving element 80. The piston 70 is moved by being moved linearly by the operation. As shown in FIG. 3, the moving member 82 is made of a solid member and has a flat surface portion 82 </ b> A that contacts the other side of the driver element 80.
[0021]
The spring material 84 is formed in a wave shape, the tip end side is in contact with the main body side step wall portion 14 and the other end side is locked and held by the locking piece 26, and the moving member 82 is pressed against the driver 80. The case body 4 is in contact with the inner surface of the case body 4 and the outer peripheral surface of the moving member 82.
[0022]
1st to 1st 3 The piezoelectric elements 86 </ b> A to 86 </ b> C are provided with a voltage application circuit 92 (see FIGS. 4 and 5) that supplies an alternating voltage in communication with each lead wire 94. The lead wire 94 is provided so as to pass through the cord receiving hole 60 and the cord insertion hole 62.
[0023]
The operation principle in the first embodiment will be described. As shown in FIG. 9, it is possible to form an ultrasonic motor as in-phase driving by using a specific point (Ux ≠ 0, Uz ≠ 0) of a standing wave. It will be. Then, by providing the driving element 80, the moving member 82 can be moved in one direction by bringing the driving element 80 into contact with the moving member 82 only at a specific position of the driving element 80. Is. Here, the specific point of the standing wave (Ux ≠ 0, Uz ≠ 0) is a point that is not a node (a point that does not move). Further, as shown in FIG. 10, a standing waveform motor using flexural vibration exhibits linear flexural vibration, and generally a surface particle linearly moves in a standing wave of one vibration mode. However, the antinode and node of the standing wave are determined (indicated by (a) in FIG. 10), the position of the protrusion is determined (indicated by (b) in FIG. 10), and the position of the protrusion is determined. When provided between the belly and the node, the direction of the driving force facing each other is one direction. At this time, if the position of the protrusion is selected and a driver is provided on the object, the driver moves as shown in FIG. That is, in FIG. 11, in the case of the driver A, the driver A exists above the middle line (support), and in the case of the driver C, the driver C is the middle line. Exists below. Then, when the magnitude of the movement force of the protrusion is divided into a vertical component and a horizontal component, the horizontal component becomes a force for moving the object. Actually, the movement of the driver is not visible, but it repeatedly moves to the point where the maximum driving force can be taken out by this object, that is, for example, it is repeated 38,000 times (ultrasonic vibration) per second. Then, the driver can be moved at a speed that can be visually recognized.
[0024]
Next, the operation of the first embodiment will be described.
[0025]
When an AC voltage is applied from the voltage application circuit 92 to each of the first to third piezoelectric elements 86A to 86B of each drive component 78, a standing wave is generated in the base member 88 of the drive component 78. At this time, this standing wave is generated. The wave only repeats up and down movement and the waveform does not advance (see FIG. 4). However, the driver 80 in contact with the flat surface portion 82A of the moving member 82 converts the ultrasonic vibration into a linear motion and moves. Since the member 82 is pressed against the driver element 80 by the spring member 84 with a constant pressure, as shown in FIG. 2B, the moving member 82 moves to the front end side (see FIG. 5). The piston 70 is pressed and moved toward the distal end side, and the chemical solution comes out from the distal end of the needle 76.
[0026]
That is, as shown in FIG. 2, when the position of the driver element 80 exists between the antinode and the left side of the node, the moving member 82 moves leftward (shown by (b) in FIG. 2), When the driver element 80 exists between the abdomen and the right side of the node, the moving member 82 moves to the right (shown by (c) in FIG. 2). However, since the driver element 80 is fixed to the base member 88, it is necessary to shift the position of the wave peak. In order to shift the peak of this wave, it is necessary to provide three or more piezoelectric elements 86 for one driver element 80. In this first embodiment, it is necessary to provide first to third piezoelectric elements 86A to 86C. The position 80 is installed at a substantially central portion of the second piezoelectric element 86B at the center among the first to third piezoelectric elements 86A to 86C (shown in FIG. 2A). At this time, in order to apply a voltage to the first to third piezoelectric elements 86A to 86C as the electrode 90, first to third electrodes 90A to 90C corresponding to the first to third piezoelectric elements 86A to 86C are provided. When a voltage is applied to the electrode 90, the driving structure 78 bends as shown in FIG. At this time, the wave peak is located on the right side of the central driving element 80 of the driving structure 78, the driving element 80 is positioned on the left side of the belly and the node, and the moving member 82 moves in the left direction. On the other hand, when a voltage is applied to the electrode 90 in reverse, the drive structure 78 bends as shown in FIG. At this time, the peak of the wave is located on the left side of the central driving element 80 of the driving structure 78, the driving element 80 is positioned on the right side of the belly and the node, and the moving member 82 moves rightward to the original. Return.
[0027]
As a result, since the piezoelectric element 86 is used as a power source for injecting the chemical solution, the electromagnetic force of the motor or the like is reduced. use Because it does not require heavy parts such as coils, magnets, electromagnetic steel sheets, etc., it becomes smaller and lighter overall, thus improving operability and reducing the labor for the doctor to hold, It is easy for doctors to concentrate the nerve on the needle tip and finely control the needle tip, which makes it possible to slowly advance the needle tip according to the injection state of the chemical solution, and stably inject the chemical solution The needle tip can only be inserted straight into the tissue infiltrated with the chemical solution, so that a force from the lateral direction is applied to the needle tip, stimulating the tissue not infiltrated with the chemical solution in this direction. Because there is no pain in the patient, and since the drug solution is constantly discharged from the needle tip as much as in the case of a manual syringe, the tissue is not destroyed due to excessive discharge of the drug solution, and Since the needle tip is always sprayed with a drug solution, even if the needle tip reaches the nerve fiber, the nerve fiber does not escape from the needle tip, the nerve fiber is not cut, and pain does not occur. Can alleviate the pain.
[0028]
Further, since the main body case 4, the cartridge cover 6, the needle holder 8, the end case 10 and the end plate 12 are connected by screw connection, the automatic injector 2 facilitates disassembly and assembly and facilitates replacement of the cartridge 64. In addition, maintenance and inspection can be facilitated.
[0029]
12 to 15 show a second embodiment of the present invention.
[0030]
The features of the second embodiment are as follows. That is, in FIGS. 12 and 13, reference numeral 102 denotes an automatic injector. The automatic injector 102 includes a main body case 104, a cartridge cover 106, a needle holder 108, an end case 110, and an end plate 112.
[0031]
The main body case 104 is formed in a cylindrical shape, and has a main body front end side coupling portion 118 in which a main body front end side thread portion 114 is formed on the outer peripheral surface on the front end side and a rod guide mounting groove 116 is formed on the inner peripheral surface. The main body rear end side connecting portion 122 having the main body rear end side screw portion 120 formed on the inner peripheral surface on the rear end side is provided. A rod guide 126 having a rod side insertion hole 124 is attached to the rod guide mounting groove 116.
[0032]
The cartridge cover 106 has a rear end of the cover that forms an expanded space 130 by forming a cover rear end side screw portion 128 that is screwed to the main body front end side screw portion 114 of the main body front end side connecting portion 118 on the rear end side. A side connecting portion 132, a cover-side step wall 134 oriented radially inward on the tip side, and connected to the tip surface of the cover-side step wall 134 and oriented in the axial direction on the outer peripheral surface of the cover It has a cover front end side connecting portion 138 in which a screw portion 136 is formed, and a cover side needle insertion hole 140 formed in the cover front end side connecting portion 138.
[0033]
The needle holder 108 includes a holder-side connecting portion 144 in which a holder-side screw portion 142 that is screwed to the cover tip-side screw portion 136 of the cover tip-side connecting portion 138, a seal member hole 146, and a holder-side needle insertion hole. 148 and a needle holding portion 150 formed thereon. A seal member 152 is accommodated and provided in the seal member hole 146. A seal-side needle insertion hole 154 is formed in the seal member 152.
[0034]
The end case 110 includes an end side connecting portion 158 having an end side screw portion 156 formed on the outer peripheral surface so as to be screwed to the main body rear end side screw portion 120 of the main body rear end side connecting portion 122 on the front end side, and a rear end. And a component housing wall 162 formed to be expanded by the end side step wall 160 on the side. A housing 166 is formed in contact with the inner surface of the end-side step wall 160 and the component housing wall 162 so as to form a housing insertion hole 164 and open to the rear end.
[0035]
The end plate 112 is formed in a flat shape, and is attached to an end face of the component housing wall 162 by a fixture (not shown).
[0036]
A cartridge 168 in which a chemical solution is enclosed is accommodated in the cartridge cover 106. The cartridge 168 has a syringe part 170 and a sealing member 172 on the distal end side of the syringe part 170. On the rear end side of the syringe part 172, a piston 174 that can slide in the syringe part 170 is provided. The piston 174 is provided with an O-ring 178 that seals the ring groove 176 on the outer peripheral surface in contact with the inner peripheral surface of the syringe portion 172.
[0037]
A needle 180 is inserted through the cover side needle insertion hole 140, the holder side needle insertion hole 148, and the seal side needle insertion hole 154. The rear end side of the needle 180 is pierced by the sealing member 172 so as to protrude into the syringe part 170.
[0038]
In the end case 110, a driving structure 182, a moving member 184, and a spring material 186 that is an elastic member are provided.
[0039]
The drive structure 182 is provided on the ring-shaped base member 188, at least one piezoelectric element 190 that is arranged in the circumferential direction of the base member 188 and expands and contracts when a voltage is applied, and the piezoelectric element 190. When a voltage is applied to the piezoelectric element 190 including the electrode 192, that is, when the timing of the voltage applied to the piezoelectric element 190 is controlled, a distortion operation is performed. The base member 188 is a ring-like, elastic body, and includes a central portion 194 and a peripheral portion 196. The base member-side mounting hole 198 formed in the central portion 194 and the plate-side mounting hole 200 formed in the end plate 112 are provided. It is attached to the end plate 112 with a fixture (not shown) such as a mounting bolt. The piezoelectric elements 190 are made of, for example, piezoelectric ceramics, and a plurality of the piezoelectric elements 190 are provided in the circumferential portion 196 on the rear surface side of the base member 188 at equal intervals in the circumferential direction. The electrode 192 is provided on the rear surface of the piezoelectric element 190. A lead wire 202 is connected to each piezoelectric element 190. The lead wire 202 is led to the outside through a lead wire hole 204 formed in the end plate 112 and communicates with a voltage application circuit (not shown).
[0040]
The rotating member 184 is formed in a ring shape corresponding to the base member 188, and is provided in contact with the distal end side of the peripheral portion 196 of the base member 188. When the voltage is applied to the piezoelectric element 190, the driving structure 182 is distorted. It rotates when it operates. The rotating member 184 is provided with a moving shaft 206 that protrudes into the end case 110 through the housing insertion hole 164 of the housing 166 at the central portion.
[0041]
Between the rotating member 184 and the housing 166, a spring material 186 that presses the rotating member 184 toward the base member 188 is fitted and provided on the moving side shaft 206. The housing 166 is fixed to the end plate 112 by a fixture (not shown) such as a mounting bolt inserted through the housing side mounting hole 208 formed in the housing 166 and the plate side fixing hole 210 formed in the end plate 112. .
[0042]
A joint mechanism 212 that communicates with the tip of the moving shaft 206 is provided in the end case 110. The joint mechanism 212 includes a first coupling 214 that communicates with the distal end of the moving shaft 206 and a second coupling 216 that engages with the first coupling 214.
[0043]
A rotating shaft 218 is connected to the second coupling 216. The rotary shaft 218 is formed with a nut screw portion 220 on the rear end side, a flange portion 222 on the tip end side of the nut screw portion 220, and a shaft screw portion 224 longer on the tip end side of the flange portion 222. Has been. Between the nut screw portion 220 and the flange portion 222, first and second bearings 226 and 228 are arranged in parallel. The first and second bearings 226 and 228 are held by bearing grooves 230 formed on the inner peripheral surface of the main body case 104 on the outer peripheral surface. The end face of the first bearing 226 includes an inner fixing nut 232 screwed to the nut screw portion 220 and an outer fixing nut 234 screwed to the main body rear end side screw portion 120 formed on the inner peripheral surface of the main body case 104. Is held by.
[0044]
A rod nut 236 is screwed onto the shaft screw portion 224 of the rotary shaft 218. The rod nut 236 is connected to a cylindrical rod 238. The rod 238 includes a rod expansion portion 240 that is in contact with the outer peripheral surface of the rod nut 236 and a rod connection portion 242 that is loosely fitted to the shaft screw portion 224. The rod nut 236 and the rod extension portion 240 are integrally connected by a slide pin 244 oriented radially from the outside. The slide pin 244 is provided so as to be movable in a long hole 246 for the pin formed in the main body case 104 with a predetermined length in the axial direction.
[0045]
A piston-side thread portion 250 formed on the rear end side of the piston 174 is screwed to the rod-side thread portion 248 formed on the inner peripheral surface on the distal end side of the rod connecting portion 242.
[0046]
The operation principle of the second embodiment will be described. As shown in FIG. 14, in the ring type traveling wave motor, a part of the ring is shown, and two vibration sources are arranged at a predetermined interval using a piezoelectric element. One vibration source is A, Csinωt vibration is generated by voltage, the other vibration source is B, and Ccosωt vibration is generated by voltage. Here, C is the amplitude of vibration and ω is the angular frequency. Therefore, in this second embodiment, when pressure is applied to the rotating member 184 by the spring material 186, the rotating member 184 receives a tangential force due to the elliptical motion at one portion in contact with the wave front of the traveling wave in one direction. It moves. Further, as shown in FIG. 15, two rings overlap each other, a traveling wave runs on one ring, and the other ring is pressed with a strong pressure. Each point on the surface of the ring where the traveling wave is running has an elliptical motion with an amplitude of several microns. Since the surface of the other ring is in contact with the wave head, it rotates by being dragged by the elliptical motion. Here, in order to propagate the traveling wave only in one direction, two vibration sources A and B are required. Further, when the rotating member 184 is returned to the original state, it may be reversed, but for this purpose, the phase of the voltage applied to the piezoelectric element of the vibration source A or the vibration source B may be reversed. In FIG. 14, when the voltage operation of the piezoelectric element of the vibration source B is performed, it is only necessary to cause the vibration source B to generate a vibration of −C cos ωt.
[0047]
According to the configuration of the second embodiment, when an AC voltage is applied to the piezoelectric element 190, the rotating member 184 is rotated by the distortion operation of the drive structure 182, and the rotation of the rotating member 184 causes the joint mechanism 212 to rotate. The rotary shaft 118 rotates via the rod, and the rotation of the rotary shaft 118 causes the rod 238 to move linearly via the rod nut 236, so that the piston 174 is pressed and moved to eject the drug solution from the needle tip of the needle 180. .
[0048]
As a result, the same effect as that of the first embodiment described above can be obtained, and the piston 174 can be pressed and moved by changing the rotational motion of the rotating member 184 to the rod 238 into the linear motion, thereby further reducing the size and operation. This improves the accuracy of protrusion of the chemical liquid.
[0049]
Of course, the present invention is not limited to the above-described embodiments, and various application modifications are possible.
[0050]
For example, the automatic injector can be used not as a medical device but as a fluid discharge device, for example.
[0051]
Further, the automatic injector of the present invention can be used as a therapeutic instrument for injecting a dental material such as a two-component mixed epoxy resin or a therapeutic instrument for injecting a one-component dental material. Is. Examples of dental materials such as two-component mixed epoxy resins include addition polymerization type silicone impression materials, and examples of one-component dental materials include functional margin sealing materials for denture bases. is there.
[0052]
【The invention's effect】
As is apparent from the detailed description above, according to the present invention. , Miniaturization and weight reduction improve operability, reduce the burden on the doctor, enable delicate control of the needle tip, and reduce patient pain.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an automatic injector.
FIG. 2A is a diagram for explaining before operation;
(B) is a diagram illustrating the operation.
(C) is a diagram for explaining returning.
FIG. 3 is an enlarged cross-sectional view of a moving member.
FIG. 4 is a cross-sectional view of a driving structure in a distorted operation state.
FIG. 5 is a sectional view showing a moving state of a moving member by a distortion operation of a driving structure.
FIG. 6 is a configuration diagram of a driving structure.
FIG. 7 is a cross-sectional view showing a state bent to one side of a drive structure.
FIG. 8 is a cross-sectional view showing a state where the drive structure is bent to the other side.
FIG. 9 is a diagram for explaining specific points of a standing wave in the description of the operation principle of the first embodiment.
FIG. 10 is a diagram for explaining the movement of the standing wave motor in the explanation of the operation principle of the first embodiment.
FIG. 11 is a diagram for explaining the movement of the moving member and the driver in the explanation of the operation principle of the first embodiment.
FIG. 12 is a cross-sectional view of an automatic injector in the second embodiment.
FIG. 13 is a schematic configuration diagram of each part of the automatic injector according to the second embodiment.
FIG. 14 is a diagram for explaining the movement of a traveling wave motor in the explanation of the operation principle of the second embodiment.
FIG. 15 is a diagram for explaining the movement of the ring type traveling wave motor in the explanation of the operation principle of the second embodiment.
[Explanation of symbols]
2 Automatic syringe
4 Body case
64 cartridges
70 piston
78 Drive structure
80 Driver
82 Moving member
84 Spring material
86 Piezoelectric elements
88 Base member
90 electrodes
92 Voltage application circuit

Claims (2)

In a dental auto-injector provided with a cartridge in which a medical solution is sealed, a needle is provided on the front end side of the cartridge, and a piston is provided that is pressed and moved on the rear end side of the cartridge so as to push out the medical solution of the cartridge from the needle. Three or more polarized piezoelectric elements that expand and contract when a voltage is applied, a base member that is provided on one side surface of the piezoelectric element and elastically deforms, and is provided on the other side surface of the piezoelectric element. And a drive structure that is distorted when an AC voltage is applied to the piezoelectric element. One side of the driver that converts the distorted operation of the drive structure into a linear operation is provided on the base. Provided on a member, and is urged by an elastic member formed in a wave shape so as to press the driver against the base member to come into contact with the other side of the driver, and by the operation of the driver. Linearly moving by providing a moving member for pressing move the piston, dental automatic injector the moving member, characterized in that the return to the original position by reversing the phase of the AC voltage applied to the piezoelectric element . In a dental auto-injector provided with a cartridge in which a medical solution is sealed, a needle is provided on the front end side of the cartridge, and a piston is provided that is pressed and moved on the rear end side of the cartridge so as to push out the medical solution of the cartridge from the needle. A base member made of a single metal member that is elastically deformed in a ring shape , a plurality of piezoelectric elements that are arranged in a circumferential direction of the base member and expand and contract when a voltage is applied, and the piezoelectric element A ring-shaped rotation that is configured by a driving structure that is distorted when a voltage is applied to the piezoelectric element, and that rotates when the driving structure is distorted when an AC voltage is applied to the piezoelectric element. A member is provided in contact with the base member, and an elastic member is provided for pressing the rotating member against the base member. A rotating shaft is connected to the rotating member via a joint mechanism. The rod is moved linearly by the rotation of the rotating shaft to press and move the piston, and the rotating member is returned to the original position by inverting the phase of the AC voltage applied to the piezoelectric element. An automatic dental syringe.

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