Needleless injector

Abstract

A needleless injector includes an injector assembly including a container that contains an injection target substance and a driver that has a mechanism that pressurizes the injection target substance to cause the injection target substance to be ejected from a nozzle formed at a top end of the container, a housing in which the injector assembly is fitted, a sensor that detects a pressing force when the nozzle is pressed against an injection target region, and a control circuit that acquires the pressing force detected by the sensor and, when the pressing force reaches a first prescribed value or more, makes a first determination that the driver is operable.

Description

Technical Field

[0001] This invention relates to needle-free injectors. Background Technology

[0002] In the needleless injector described in Patent Document 1, a protruding member is positioned in a first position, protruding from the end face of the housing. When the user brings the injection port into contact with the target area for injection, and the protruding member is pressed and moved to a second position, the needleless injector applies voltage to the drive unit, ejecting the target substance. In this way, the needleless injector of Patent Document 1 is configured to ignite the propellant based on the user's pressing action, preventing accidental ejection by the user.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-150401 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In needle-free injectors, when administering the injection solution (target substance) into the target area within the skin, the depth of administration can vary depending on the pressure applied when the nozzle is pressed against the skin. For example, when the needle-free injector is pressed with an appropriate pressure above a specified value, the target substance is administered intradermally (the superficial layer beneath the skin). Conversely, if the pressure is too low, the substance may sometimes penetrate beyond the intradermis and reach the muscle. In cases where a large amount of substance exhibiting activity against the injection solution is present in the skin, the goal is intradermal injection (to the target area). However, if the pressure applied to the skin with the needle-free injector is too low, the injection solution may be administered to a depth sufficient to reach the muscle, sometimes failing to achieve the desired effect of the injected target substance.

[0008] The technology disclosed herein was made in view of the above-mentioned actual situation, and its purpose is to provide a needle-free injector capable of delivering a target substance to a target depth.

[0009] Solution for solving the problem

[0010] To address the aforementioned issues, the needle-free injector disclosed herein includes:

[0011] A syringe assembly includes a container and a actuator, the container containing an injectable target substance, and the actuator having a mechanism for pressurizing the injectable target substance to eject the injectable target substance from a nozzle formed at the top of the container.

[0012] Housing for assembling the syringe assembly;

[0013] Sensors detect the pressure applied when the nozzle is pressed onto the injection target area; and

[0014] The control circuit acquires the pressing force detected by the sensor, and when the pressing force reaches or exceeds a first predetermined value, the control circuit makes a first determination that the driver can work.

[0015] Alternatively, the needle-free injector may also include a notification unit that notifies the user of the result of the first determination made by the control circuit.

[0016] Alternatively, if the pressing force detected by the sensor is greater than or equal to a second predetermined value that is greater than the first predetermined value, the control circuit may make a second determination that the driver cannot work.

[0017] Alternatively, the needle-free injector may also include a notification unit that notifies the user of the result of the first determination or the result of the second determination.

[0018] Alternatively, when the pressing pressure is above the first predetermined value but less than the second predetermined value, the notification unit sends a first notification to the user; when the pressing pressure becomes above the second predetermined value, the notification unit sends a second notification to the user.

[0019] The contents of the first notification and the second notification are different.

[0020] Alternatively, the syringe assembly can be detachably assembled to the housing.

[0021] The sensor is disposed between the syringe assembly and the housing.

[0022] In the needleless injector, multiple sensors may be arranged in a position symmetrical about the central axis of the injector assembly.

[0023] In the needle-free injector, it could also be,

[0024] In the nozzle, a plurality of nozzle tips containing injection outlets of the target substance are arranged about a predetermined axis along the pressing direction on the injection target area.

[0025] The plurality of said sensors are arranged in a position symmetrical about the specified axis.

[0026] Alternatively, the control circuit may cause the memory to store log data representing the pressure applied when the injected target substance is ejected, cause the display to display the log data, or send the log data to an external device.

[0027] Alternatively, the control circuit can set the first predetermined value based on at least one of the user input, the type of the injection target substance, the type of the container, and the injection object.

[0028] Alternatively, the notification section may be a display section that shows the pressing pressure in numerical or graphical form.

[0029] Alternatively, if the control circuit determines that the driver is working, it drives the driver to eject the target substance from the nozzle.

[0030] Alternatively, the control circuit may provide a work notification to the user during the period from making the first determination until sending the work signal to the driver.

[0031] Invention Effects

[0032] According to this disclosure, a needle-free injector can be provided that can deliver a target substance to a target depth. Attached Figure Description

[0033] Figure 1 This is a schematic diagram showing the appearance of a syringe.

[0034] Figure 2 This is the first cross-sectional view of the syringe.

[0035] Figure 3 This is the second sectional view of the syringe.

[0036] Figure 4 This is a diagram showing the structure of the casing 2 that makes up the syringe.

[0037] Figure 5 This is a diagram showing the general structure of the syringe components.

[0038] Figure 6 It is a cross-sectional view showing the approximate structure of the container.

[0039] Figure 7 It is a diagram showing the approximate structure of the container.

[0040] Figure 8 This diagram shows the configuration of the sensors installed on the upper wall of the accommodating space.

[0041] Figure 9 It is a diagram showing the structure of the control circuit.

[0042] Figure 10 This is a diagram illustrating the control method executed by the control circuit of the syringe.

[0043] Figure 11 This is a diagram showing the configuration of a modified nozzle.

[0044] Figure 12 This is a diagram showing the configuration of the sensors in the modified example.

[0045] Figure 13 This is a diagram illustrating the control method of the second embodiment. Detailed Implementation

[0046] <First Implementation>

[0047] Hereinafter, with reference to the accompanying drawings, the needleless injector (hereinafter referred to as "injector") 1 of the embodiments disclosed in this application will be described. The injector 1 is a needleless injector that uses the combustion energy of gunpowder to eject an ejaculate liquid equivalent to the injection target substance of this application into the injection target area (hereinafter also simply referred to as the target area). That is, it is a device that injects by ejecting an ejaculate liquid into the target area without using an injection needle.

[0048] It should be noted that the various components and combinations thereof in each embodiment are merely examples, and appropriate additions, omissions, substitutions, and other modifications to the components can be made without departing from the spirit of this application. Furthermore, in each embodiment, the target substance is referred to as an injection liquid, but this is not intended to limit its form; for example, the target substance may also be in powder form. This application is not limited by the embodiments, but only by the claims. In this embodiment, "tip side" and "base side" are used as terms indicating the relative positional relationship in the longitudinal direction of the syringe 1. The "tip side" refers to the position near the tip of the syringe 1 (described later), i.e., near the injection port 77, and the "base side" refers to the direction in the longitudinal direction of the syringe 1 opposite to the "tip side," i.e., the syringe assembly 10 (see below). Figure 5 The direction of the igniter 22 side in the ).

[0049] <Components of a Syringe>

[0050] Here, Figure 1 This is a schematic diagram showing the appearance of syringe 1. Figure 2 This is a first sectional view of syringe 1, the section of which will be described later. Figure 4 Section AA in the image. Furthermore... Figure 3 This is a second sectional view of syringe 1, the section of which will be described later. Figure 4 The BB section is orthogonal to the AA section. Figure 4 This is a diagram showing the structure of the housing 2 that makes up the syringe 1. Figure 5 This is a diagram showing the schematic configuration of the syringe assembly 10. The syringe 1 is formed by assembling the syringe assembly 10 into the housing 2. The housing 2 houses the control circuit 3 and the sensor 4. Furthermore, a cable 9 for supplying drive current to the driver 20 within the syringe assembly 10 is connected to the housing 2. Figure 1 ).

[0051] The ejaculate injected into the target area using syringe 1 is formed by containing a specified substance in a liquid medium that performs the desired effect or function of the target area. In this ejaculate, the specified substance may be dissolved in the liquid medium, or it may be mixed but not dissolved.

[0052] Examples of substances included in the ejaculate include biologically derived substances that can be ejected onto the target area of ​​a living organism, and substances that exhibit the desired physiological activity. Examples of biologically derived substances include DNA, RNA, nucleic acids, antibodies, and cells. Examples of substances exhibiting physiological activity include drugs composed of low molecular weight molecules, proteins, peptides, etc., vaccines, inorganic substances such as metal particles used in thermotherapy and radiotherapy, and substances containing carriers with various pharmacological / therapeutic effects. Furthermore, the liquid serving as the medium for the ejaculate can be any substance suitable for delivering these specified substances into the target area, regardless of its aqueous or oily nature. Moreover, the viscosity of the liquid serving as the medium is not particularly limited, as long as the specified substances can be ejected through syringe 1.

[0053] In syringe 1, syringe assembly 10 is configured to be removable from and detachable from housing 2. During the preparation phase before syringe 1 is operational, fluid is introduced into the receiving space 75 (see reference 2) formed between the container (receiving portion) 70 and the plunger 80 included in syringe assembly 10. Figure 5 The syringe assembly 10 is a unit that is replaced each time an ejaculate is dispensed. Details about the syringe assembly 10 will be described later.

[0054] On the other hand, the housing 2 has a handle 2a for the user to grip and use the syringe 1, and is provided with multiple switches for operating the syringe 1 to eject the ejaculate fluid. It should be noted that the syringe 1 is configured so that the user can grip and operate it with one hand. Here, based on... Figure 4 The casing 2 will be described. Figure 4 middle, Figure 4 (a) indicates the appearance of housing 2 as viewed from the front. Figure 4 (b) shows the appearance of housing 2 as viewed from the side. Figure 4 (c) indicates the appearance of housing 2 as viewed from the rear. Figure 4 (d) indicates the appearance of housing 2 as viewed from above. Here, "front" refers to the part located at the farthest point from the user when the user grips housing 2. Figure 4 In (b), the part located on the left side, and "behind" refers to the part located closer to the user, in contrast. Figure 4In (b), it is located on the right side. Therefore, when the user holds the housing 2 with one hand, their fingertips are hooked in front of the housing 2, which is the distal side, and their wrist is close to the rear of the housing 2, which is the proximal side. In addition, "above" refers to the part on the base side of the syringe 1.

[0055] Considering the user's grip, a handle portion 2a is provided at the front of the housing 2 to facilitate hooking by the user's fingertips. Multiple indentations are formed in the handle portion 2a to improve the hooking experience for the user's fingertips. Furthermore, to further stabilize the user's grip on the housing, the front side of the handle portion 2a has a gently sloping contour with raised and recessed areas (see reference). Figure 4 (b) makes it easy for the user's index and middle fingers to hook.

[0056] Furthermore, the housing 2 is equipped with two operating switches for operating the syringe 1, namely the first switch 5 and the second switch 6. The first switch 5 and the second switch 6, as described later, are connected to a control unit such as a microcontroller. This control unit controls the supply of ignition current to the igniter 22 based on signals from each switch, thereby controlling the operation of the syringe 1. Here, the first switch 5 is a sliding switch located at the rear of the housing 2, and its sliding direction is the vertical direction of the housing 2 (the direction connecting the top and bottom ends). The first switch 5 is always subjected to upward force. By continuously sliding the first switch 5 downward (towards the top end) against its applied force for a certain period of time, the user can bring the syringe 1 into a standby state. Hereinafter, the operation of bringing the syringe 1 into a standby state will also be referred to as the start operation. This standby state refers to the state in which preparation for ejecting the ejaculate liquid has been completed in the syringe 1, and is the state in which ejection will be performed if the user performs an additional operation. Furthermore, by continuously sliding the first switch 5 downward against its applied force for a certain period of time in the standby state, the user can deactivate the standby state of the syringe 1.

[0057] Next, the second switch 6 is a push-button switch located on the inclined surface 2b above the housing 2, which the user can press inwards towards the housing 2. When the syringe 1 is placed in standby mode via the aforementioned start operation, pressing the second switch 6 configures the control unit to supply ignition current to the igniter 22. Furthermore, a display unit 8 is provided on the inclined surface 2b above the housing 2. The display unit 8 is a notification unit that displays judgment results obtained from the control circuit 3 to notify the user. The notification unit is not limited to the display unit 8; it can also be an indicator, a speaker, a communication module, etc. Moreover, a connector 2L for connecting the cable 9 is provided on the front inclined surface 2c above the housing 2. In this embodiment, the connector 2L is a USB (Universal Serial Bus) connector, and the cable 9 is designed to be detachable from the housing 2.

[0058] It should be noted that, as described above, in this embodiment, power for operating the igniter 22 is supplied from the outside via cable 9. However, alternatively, a battery for supplying this power can be installed inside the housing 2. In this case, as long as there is remaining power in the battery, the housing 2 can be reused repeatedly while replacing the syringe assembly 10. Furthermore, when the battery is depleted, it can be replaced or recharged.

[0059] An opening 2d for inserting the syringe assembly 10 is provided on the lower side (top surface) 2u of the housing 2, and a receiving space 2e for receiving the syringe assembly 10 is provided extending upward from the opening 2d. Figure 2 The receiving space 2e has a shape corresponding to the syringe assembly 10, and in this embodiment is generally cylindrical. A socket 7 and a sensor 4 are disposed at the upper end of the receiving space 2e.

[0060] <Instrument Components>

[0061] like Figure 2 and Figure 3 As shown, the syringe assembly 10 forms the syringe 1 by being assembled to the housing 2. Furthermore, as... Figure 5 As shown, the syringe assembly 10 of this embodiment is an assembly including a driver (drive unit) 20, an accessory 30, a container 70, and a plunger 80. The assembly of the syringe assembly 10 will be described later.

[0062] The actuator 20 has a cylindrical body 21. The body 21 has a central portion 21a, a top portion 21b, and a base portion 21c. The internal spaces of the top portion 21b, central portion 21a, and base portion 21c are interconnected, and an opening is provided at the top of the top portion 21b. An igniter 22, an electric igniter, is mounted at the base portion 21c of the body 21 to generate ejection energy by igniting the initiating explosive. The igniter 22 has an ignition lead 22b supplied with ignition current from the outside, which engages with a socket 7 on the housing 2 side when the syringe assembly 10 is mounted on the housing 2. Furthermore, the assembly state of the igniter 22 relative to the body 21 is determined such that combustion products generated by the operation of the igniter 22 are released towards the central portion 21a of the body 21. That is, the igniter 22 is mounted on the base end 21c of the main body 21 in such a way that the combustion product release surface 22c faces the central part 21a.

[0063] Here, the combustion energy of the initiating explosive used in the igniter 22 becomes the energy required to propel the injector 1 to the target area. It should be noted that the following explosives, or combinations thereof, are preferably used as the initiating explosive: zirconium and potassium perchlorate explosives (ZPP), titanium hydride and potassium perchlorate explosives (THPP), titanium and potassium perchlorate explosives (TiPP), aluminum and potassium perchlorate explosives (APP), aluminum and bismuth oxide explosives (ABO), aluminum and molybdenum oxide explosives (AMO), aluminum and copper oxide explosives (ACO), and aluminum and iron oxide explosives (AFO). These explosives generate high-temperature, high-pressure plasma upon immediate combustion after ignition, but if the combustion products condense at room temperature, they contain no gaseous components, thus exhibiting a characteristic of a rapid pressure drop. It should be noted that explosives other than these can also be used as the initiating explosive, provided that a suitable injectable liquid can be ejected.

[0064] The main body 21 is a cylindrical component, and the internal space of the central portion 21a is configured as a combustion chamber 20a. Furthermore, an external thread 26 is formed on a portion of the outer surface of the central portion 21a. The external thread 26 is configured to engage with the internal thread 32 of the accessory 30 (described later), and the effective lengths of the external thread 26 and the internal thread 32 are determined to ensure the required engagement force between them. Additionally, the internal space of the top portion 21b adjacent to the central portion 21a is formed in a cylindrical shape and is configured to allow the piston 40 to slide within this internal space.

[0065] Furthermore, when the igniter 22 is activated, combustion products are released into the combustion chamber 20a, and as the pressure in the combustion chamber 20a rises, the piston 40 slides towards its tip under this pressure. In other words, the actuator 20 has a mechanism that uses the igniter 22 as its operating source and the piston 40 as its output.

[0066] like Figure 5 As shown, Attachment 30 is a component used for assembling the actuator 20, plunger 80, and container 70. The body 31 of Attachment 30 can be made of resins such as known nylon 6-12, polyarylate, polybutylene terephthalate, polyphenylene sulfide, or liquid crystal polymers. Furthermore, these resins may contain fillers such as glass fibers or glass fillers; polybutylene terephthalate may contain 20% to 80% by mass of glass fibers; polyphenylene sulfide may contain 20% to 80% by mass of glass fibers; and liquid crystal polymers may contain 20% to 80% by mass of minerals. It should be noted that the material of Attachment 30 is not limited to resin; it can also be metal or ceramic.

[0067] like Figure 5As shown, the actuator 20 is disposed in the internal space of the main body 31 from the base end side to the center. Furthermore, in this internal space where the actuator 20 is disposed, the base end portion 21c of the actuator 20 is located approximately in the region on the base end side, and the central portion 21a and the top portion 21b of the actuator 20 are located approximately in the region on the top end side, whose diameter is smaller than that of the base end side. In addition, an internal thread portion 32 is disposed on the inner wall surface of the main body 31, and the internal thread portion 32 is formed to engage with the external thread portion 26 provided in the central portion 21a of the actuator 20.

[0068] Moreover, such as Figure 5 As shown, the plunger 80 is disposed approximately in the internal space of the body 31 in a region closer to the top than the region where the actuator 20 is disposed. The diameter of the region where the plunger 80 is disposed is smaller than the diameter of the region where the top portion 21b of the actuator 20 is disposed, and is a diameter that allows the plunger 80 to slide.

[0069] Furthermore, a portion of the container 70 is disposed approximately in the top-side region of the interior space of the main body 31. This region where the container 70 is disposed communicates with the region where the plunger 80 is disposed on its base end side, and its top side opens at the top surface of the attachment 30. An internal thread 36 for assembling the container 70 is formed on the inner wall of the region where the container 70 is disposed. The internal thread 36 is related to the following... Figure 6 , Figure 7 The external thread 74 of the container 70 shown is screwed in, thereby connecting the accessory 30 to the container 70.

[0070] Next, the plunger 80 will be described. The plunger 80 is a component that pressurizes the ejected fluid using energy received from the piston 40, and has a plunger rod 81 and a stop portion 82. The plunger rod 81 is formed, for example, of a resin material suitable for its pressurization, but is not limited thereto; for example, it may also be formed of the same material as that used in the attachment 30.

[0071] A stop portion 82, formed of an elastic component such as rubber, is fitted to the top end of the plunger rod 81. It should be noted that the specific material of the stop portion 82 can be, for example, butyl rubber or silicone rubber. Further examples include styrene-based elastomers, hydrogenated styrene-based elastomers, polyolefins mixed with polyethylene, polypropylene, polybutene, α-olefin copolymers, liquid paraffin, process oils, talc, casting powder, mica, and other powdered inorganic materials. Furthermore, various rubber materials (especially vulcanized rubber materials) such as polyvinyl chloride elastomers, olefin elastomers, polyester elastomers, polyamide elastomers, polyurethane elastomers, natural rubber, isoprene rubber, chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, as well as mixtures thereof, can also be used as the material of the stop portion 82. Furthermore, the stop portion 82 slides within the container 70 while pressurizing the ejected liquid. Therefore, to ensure and adjust the sliding properties between the stop portion 82 and the inner wall surface 75a of the container 70's containing space 75, various substances can be used to coat or surface-process the surface of the stop portion 82 and the inner wall surface 75a of the container 70. As such coating agents, PTFE (polytetrafluoroethylene), silicone oil, diamond-like carbon, nanodiamonds, etc., can be used.

[0072] Figure 6 This is a cross-sectional view showing the approximate structure of container 70. Figure 7 This is an external view showing the general configuration of container 70. Container 70 is a component that contains the ejaculate liquid and defines the flow path for ejecting the ejaculate liquid, pressurized by plunger 80, to the target area. Container 70 is formed of a material that takes into account the pressurization of the plunger and the definition of the flow path. In this embodiment, container 70 is formed of resin material. It should be noted that container 70 is not limited to resin material, and may also be formed of, for example, the same material as that in Annex 30.

[0073] The container 70 is a space capable of containing the ejaculated liquid, having a receiving space 75 formed to allow the stop portion 82 of the plunger 80 to advance, and a flow path 76 connecting the receiving space 75 to an ejection port (ejection portion) 77 facing the outside of the container 70. Specifically, the container 70 has: a body 70a, defining the receiving space 75, having a cylindrical shape; and a nozzle 70c, connected to the top end side of the body 70a, defining the flow path 76. Moreover, the nozzle 70c is configured to have a nozzle tip portion 70c2 and a tapered portion 70c1, the nozzle tip portion 70c2 internally including a portion of the flow path 76 on the ejection port 77 side, the tapered portion 70c1 connecting the nozzle tip portion 70c2 to the body 70a, and including a top-side outer surface 70c3 inclined relative to the central axis in the longitudinal direction of the attachment 30. Furthermore, an anti-misalignment member 50, described later, is embedded around the outer periphery of the nozzle tip portion 70c2.

[0074] In syringe assembly 10, such as Figure 5 As shown, the tip of the plunger 80 is embedded into the receiving space 75 of the container 70 in such a way that the stop 82 of the plunger 80 can slide in the direction of the nozzle 70c (tip side direction) within the receiving space 75. With the plunger 80 embedded in the container 70 in this state, the space between the stop 82 of the plunger 80 and the container 70 becomes a storage space for the eluent, i.e., a space for sealing the eluent. In other words, when the plunger 80 is initially embedded in the receiving space 75 of the container 70, the tip surface of the stop 82 and the inner wall surface of the container 70, located closer to the tip surface of the stop 82, define the storage space. The flow path of the container 70 opens at the tip surface 73 of the nozzle 70c, forming an injection port 77. Therefore, when the eluent contained in the receiving space 75 is pressurized by sliding the plunger 80 within the receiving space 75, the eluent is ejected from the injection port 77 through the flow path 76.

[0075] Furthermore, the inner diameter of the flow path 76 in the container 70 is made smaller than the inner diameter of the receiving space 75. With this configuration, the pressurized liquid is ejected from the ejection port 77 to the outside. Additionally, an external thread 74 for assembling the container 70 to the accessory 30 is formed on the outer periphery of the base end side. The external thread 74 engages with the internal thread 36 of the accessory 30.

[0076] The top end shape of the stop portion 82 in the plunger 80 is formed to approximately match the top end shape of the receiving space 75, which is defined by the inner wall surface 75a near the portion where the receiving space 75 connects to the flow path 76 (the innermost part of the receiving space 75). In this embodiment, both the top end shape of the stop portion 82 and the top end shape of the receiving space 75 are tapered shapes that narrow towards the top. Therefore, when the ejaculate is ejected, the gap between the stop portion 82 and the inner wall surface 75a of the container 70 is minimized as much as possible when the plunger 80 slides and reaches the innermost part of the receiving space 75, thus preventing ejaculate from remaining in the receiving space 75 and causing waste. However, the shape of the stop portion 82 is not limited to any particular shape, as long as the desired effect is achieved in the syringe 1 of this embodiment. Furthermore, the stop portion 82 is formed with an outer diameter slightly larger than the receiving space 75 of the container 70, so that when it is embedded in the receiving space 75 in a radially compressed state, it makes proper contact with the inner wall surface 75a in a manner that maintains an airtight seal with the container 70. It should be noted that, as long as a suitable ejaculate liquid can be ejected, the outer diameter of the stop portion 82 can also be approximately the same as the diameter of the receiving space 75, and is not formed to be larger than the diameter of the receiving space 75.

[0077] <Instrument Assembly>

[0078] In assembling the syringe 1, the assembly of the syringe assembly 10 will be described first. With the stop 82 of the plunger 80 inserted into the innermost part of the receiving space 75 of the container 70, the outlet 77 of the container 70 is connected to the ejaculate fluid, and the plunger 80 is pulled back. The stop 82 is in close contact with the inner wall surface 75a of the receiving space 75, so a negative pressure is generated in the receiving space by its pull-back action, thereby filling the receiving space 75 with ejaculate fluid from the outlet 77. The pull-back amount of the plunger 80 at this time is set to such a level that when the container 70 is assembled with the accessory 30 in this state, the plunger 80 (plunger rod 81) exposed from the container 70 reaches the area for the piston 40 to be positioned in the internal space of the accessory 30.

[0079] When the container 70, with the receiving space 75 filled with the ejaculate liquid, is assembled with the attachment 30, the actuator 20 is further inserted into the attachment 30 from the base end side. The actuator 20 is inserted until the top surface of the piston 40, located at its top end 21b, reaches the base end surface of the plunger 80 within the attachment 30. At this point, the actuator 20 and attachment 30 are properly engaged by screwing the external thread 26 of the actuator 20's central portion 21a with the internal thread 32 of the attachment 30. At this point, the piston 40 assembled with the actuator 20 is connected to the plunger 80. It should be noted that the connection between the piston 40 and the plunger 80 is not limited to simple abutment; a fitting portion can also be provided at the top end of the piston 40 and the base end of the plunger 80 for engagement.

[0080] When the driver 20 is assembled to the accessory 30, which is equipped with the container 70 and the plunger 80, as described above, the plunger 80 is pressed in such a way that it advances from the piston 40 toward the tip side, and within the container 70, the plunger 80 is positioned in a predetermined position (pre-operation position). At this time, according to the pressing in of the plunger 80, excess ejaculate fluid in the container 70 is discharged from the ejection port 77, leaving a predetermined amount of ejaculate fluid in the container 70. It should be noted that the volume of the space for containing ejaculate fluid formed between the plunger 80, which is positioned in the pre-operation position, and the container 70 is determined to be the volume that ensures an appropriate amount of ejaculate fluid when the syringe 1 is operating. Therefore, when the syringe assembly 10 is assembled as described above, the amount of ejaculate fluid contained in the receiving space 75 of the container 70, i.e., the amount of ejaculate fluid to be ejected, is determined to be a predetermined amount.

[0081] In this configuration of the syringe assembly 10, the base end portion is inserted into the receiving space 2e of the housing 2, and the ignition lead 22b of the igniter 22 is embedded in the socket 7 on the housing 2 side, thereby assembling it to the housing 2. At this time, the base end face 101 of the syringe assembly 10 abuts against the sensor 4. It should be noted that the syringe assembly 10 may also have a configuration that prevents it from falling off the housing 2 when the ignition lead 22b is embedded in the socket 7 on the housing 2 side. Furthermore, the syringe assembly 10 may also be configured such that the syringe assembly 10 is held in place by contacting and interference-fitting the inner wall 2h of the defined receiving space 2e with the outer wall of the syringe assembly 10, preventing it from falling off the housing 2.

[0082] In this way, the syringe assembly 10 is loaded into the housing 2 to prepare the syringe 1 for use (see reference). Figures 1-3 The user holds the syringe 1 housing 2 with one hand, and slides the first switch 5 located at the rear of the housing 2 for a predetermined time to put the syringe 1 into a standby state. Then, the user presses the nozzle 70c onto the target area, and, as described later, presses the second switch 6 after indicating that the pressing pressure is appropriate. This activates the igniter 22, pressurizing the injection fluid via the piston 40 and plunger 80, causing the fluid to be ejected from the injection port 77 and injected into the target area.

[0083] <Sensors>

[0084] Sensor 4 detects the pressure applied when the nozzle 70c of syringe 1 is pressed against the injection target area and inputs this pressure to control circuit 3. Sensor 4 may have a piezoelectric element, for example, which converts the magnitude of strain when pressure is applied into an electrical signal. Furthermore, sensor 4 can also detect changes in capacitance caused by strain when pressure is applied to a unit with multiple electrodes. It should be noted that the method of pressure detection by sensor 4 is not particularly limited, as long as the pressure value can be input as an electrical signal to control circuit 3. When the syringe 1 is in standby mode after the start operation of the first switch 5, sensor 4 repeatedly detects pressure and inputs it to control circuit 3 at a period of approximately a few milliseconds to one second.

[0085] Sensor 4 is disposed on the upper wall 2f of the receiving space, which is located above the receiving space 2e of the housing 2. When the syringe assembly 10 is housed in the receiving space 2e, sensor 4 is sandwiched between the base end of the syringe assembly 10 and the upper wall 2f of the receiving space. That is, sensor 4 is disposed between the container 70 assembled in the syringe assembly 10 and the upper wall 2f of the receiving space of the housing 2. As for sensor 4, when the user presses the nozzle 70c at the tip of the syringe 1 onto the injection target area, the reaction force is transmitted from the base end of the syringe assembly 10 to sensor 4, and sensor 4 detects this reaction force (pressing pressure).

[0086] Figure 8 This diagram illustrates an example of the configuration of sensor 4, which is mounted on the upper wall 2f of the accommodating space. (See diagram for example.) Figure 8 As shown, multiple sensors 4 (four in this example) are arranged in a position that is rotationally symmetrical about a predetermined axis 2g. In this embodiment, the predetermined axis 2g coincides with the central axis of the receiving space 2e. Furthermore, the receiving space 2e has the same shape as the base end portion of the syringe assembly 10, so the predetermined axis 2g also coincides with the central axis of the syringe assembly 10 and the central axis of the container 70. That is, the sensors 4 are arranged in a position that is symmetrical about the central axis of the container 70. As a result, when the syringe 1 is pressed in a manner orthogonal to the surface of the target area, the detection values ​​obtained by the multiple sensors 4 are approximately the same. Conversely, when the syringe 1 is pressed at an angle relative to the surface of the target area, the detection values ​​obtained by the multiple sensors 4 differ. Therefore, the control circuit can determine whether the syringe 1 is correctly pressed in a manner orthogonal to the surface of the target area based on the detection values ​​of each sensor 4.

[0087] <Control Circuit>

[0088] Figure 9 This diagram illustrates the configuration of control circuit 3. Control circuit 3 is a computer comprising a control unit 132, a memory (storage device) 133, an input / output IF (interface) 134, and a communication IF 135, all interconnected via a connection bus 131. The control unit 132 processes the input information and outputs the processing results, thereby controlling the entire device. The control unit 132 is also referred to as a CPU (Central Processing Unit) or MPU (Micro-processing Unit). The control unit 132 is not limited to a single processor and can be configured with multiple processors. Furthermore, it can also be configured as a multi-core system with multiple cores within a single chip connected via a single socket.

[0089] The memory 133 can be a main storage device or an auxiliary storage device. The main storage device may be used as a working area for the control unit 132, a storage area for temporarily storing information processed by the control unit 132, or a buffer area for communication data. That is, the main storage device is a storage medium used by the control unit 132 to cache programs and data or as a working area. Examples of main storage devices include RAM (Random Access Memory), ROM (Read Only Memory), and flash memory. The auxiliary storage device is a storage medium that stores programs executed by the control unit 132, data used for information processing, and action setting information. Examples of auxiliary storage devices include SSD (Solid State Drive), EPROM (Erasable Programmable ROM), flash memory, USB memory, and memory cards. The auxiliary storage device may also store setting information for the syringe 1, judgment conditions, and the history (log) of detected pressure.

[0090] The input / output IF134 is an interface for inputting / outputting data between peripheral devices connected to the control circuit 3. For example, the input / output IF134 performs data input / output between devices such as readers / writers, operation units, display units, speakers, and sensors that read / write data to storage media such as flash memory and SSDs. The operation unit is an input unit that inputs information to the control circuit 3 through user operation, such as operation buttons, selection keys, or a touch panel. The display unit 8 is an output unit that displays information such as the determination result of the output control unit 132 to the user. The touch panel may also be configured to overlap with the display area of ​​the display device, detecting touch operations on icons displayed on the display device and inputting them to the control circuit 3. In this embodiment, the operation unit has a first switch 5 and a second switch 6. Furthermore, the operation unit can also set first and second predetermined values ​​by inputting them to the control circuit 3 through user operation. In addition, the control circuit 3 can also store statistical data and data tables in the memory in advance. When the user operates the operation unit and inputs information about the target substance to be injected (the type, amount, and type of container of the drug solution used) and information about the drug recipient (gender, age, body fat percentage, drug administration location, etc.), the first and second specified values ​​are set based on this information.

[0091] The communication IF135 is an interface (communication module) for communicating with other devices via a communication line (network), also known as a CCU (Communication Control Unit). In this embodiment, the communication IF135 has a wired IF51 for wired communication and a wireless IF52 for wireless communication. The wired IF51 communicates with other devices, for example, via cable 9. The wireless IF52 communicates with other devices, for example, via a WLAN (Wireless Local Area Network). The wireless IF52 in this embodiment uses the communication line specified in IEEE 802.11, but is not limited to it; for example, a Bluetooth-based communication line can also be used.

[0092] In control circuit 3, control unit 132 implements the functions described later based on an application program. That is, control unit 132 implements the required functions through software. However, some or all of these functions can also be implemented using hardware such as dedicated LSIs (large-scale integration) such as DSPs (Digital Signal Processors), ASICs (Application Specific Integrated Circuits), and FPGAs (Field-Programmable Gate Arrays), logic circuits, and other digital circuits. Furthermore, at least a portion of this hardware may include analog circuitry. Control unit 132 can be configured as a single processor functioning as multiple processing units, or it can be configured as having multiple processors functioning as processing units.

[0093] The control circuit 3 acquires the pressing pressure detected by the sensor 4, and when the pressing pressure reaches or exceeds a first predetermined value, it makes a first determination that the driver 20 can operate. Furthermore, if the pressing pressure detected by the sensor 4 exceeds a second predetermined value greater than the first predetermined value, the control circuit 3 makes a second determination that the driver 20 cannot operate. The control circuit 3 displays the results of these first and second determinations on the display unit 8 to notify the user. It should be noted that the notification to the user is not limited to notification via display unit 8, but can also be delivered through methods such as sound output from a speaker, information transmission from the CCU to the user terminal, or vibration based on a vibrator.

[0094] When the pressing pressure is above a first predetermined value and below a second predetermined value, the control circuit 3 issues a first notification to the user. Then, when the pressing pressure is above the second predetermined value, or below the first predetermined value, the control circuit 3 issues a second notification to the user. The control circuit 3, for example, causes the display unit 8 to display text, showing "Works" as the first notification and "Does not work" as the second notification. Alternatively, the control circuit 3 can output these "Works" and "Does not work" as voice messages from a speaker. Furthermore, the control circuit 3 can also indicate the corresponding color of the notification via an indicator, such as "green" for the first notification and "red" for the second notification. In this way, by making the contents of the first and second notifications different, the control circuit 3 can accurately notify the user that the appropriate pressing pressure for injection has been reached (first notification) and that excessive or insufficient pressing pressure has resulted in a non-ejection state (second notification).

[0095] <Control Methods>

[0096] Figure 10 This diagram illustrates the control method executed by the control circuit 3 of syringe 1. When the user initiates the operation and syringe 1 enters standby mode, the control circuit 3 begins... Figure 10 The processing.

[0097] In step S10, the control circuit 3 acquires information about the target substance and the recipient. For example, the control circuit 3 acquires information about the target substance and the recipient input by the user from the operation unit. Alternatively, the control circuit 3 can also acquire information about the target substance and the recipient from other devices via cable 9 or a wireless communication line.

[0098] In step S20, the control circuit 3 sets a first predetermined value and a second predetermined value based on the information of the injection target substance and the injection object obtained in step S10. It should be noted that the second predetermined value is a value larger than the first predetermined value, for example, 60N. However, it is not limited to this; the first predetermined value can also be 3N to 10N, and the second predetermined value can also be 30N to 80N.

[0099] In step S30, the control circuit 3 acquires the pressing force detected by the sensor 4 and determines whether the driver 20 can work based on whether the pressing force reaches or exceeds a first predetermined value. Here, if the pressing force is above the first predetermined value and the determination is positive, the control circuit 3 proceeds to step S40; if the determination is negative, the determination proceeds to step S100.

[0100] In step S40, the control circuit 3 acquires the pressing force detected by the sensor 4, and determines whether the driver 20 is not working based on whether the pressing force is above a second predetermined value, or whether it is not lower than a first predetermined value after being temporarily determined to be above a first predetermined value. Here, if it is determined that the pressing force is less than the second predetermined value, the control circuit 3 proceeds to step S50; if it is determined that the pressing force is above the second predetermined value, the control circuit 3 proceeds to step S110.

[0101] In step S50, the control circuit 3 determines whether the syringe 1 is being pressed at an angle based on the detection values ​​from the multiple sensors 4. If the difference between the detection values ​​obtained from each sensor 4 is less than a predetermined value, the control circuit 3 determines that the syringe 1 is being pressed appropriately without tilting and proceeds to step S60. On the other hand, if the difference between the detection values ​​obtained from each sensor 4 is greater than or equal to a predetermined value, the control circuit 3 determines that the syringe 1 is being pressed at an angle and proceeds to step S120.

[0102] In step S60, the control circuit 3 causes the display unit 8 to display information about the ability to be ejected (ejection information) as a first notification. The ejection information may include, for example, text such as "ejection is possible," numerical values ​​of the pressure applied, or a graph representing the pressure applied. Furthermore, the first notification may also include setting the displayed text, the background color to a specific color (e.g., green), outputting a specific sound, or a combination thereof.

[0103] In step S70, the control circuit 3 determines whether the second switch 6 is pressed. If the determination is positive, the process proceeds to step S80; if the determination is negative, the process proceeds to step S30.

[0104] In step S80, the control circuit 3 supplies drive current (ignition current) to the driver 20 to make the driver 20 work.

[0105] In step S90, the control circuit 3 acquires the pressing force detected by the sensor 4 at the time of injection and stores the detected pressing force value as a log in the memory 133. Not limited to this, the control circuit 3 may also be configured to display the log data on the display unit 8 or send the log data to an external device. Thus, the control circuit 3 can subsequently confirm whether the injection was performed with an appropriate pressing force.

[0106] If a negative decision is made in step S30 and the process proceeds to step S100, the control circuit 3 causes the display unit 8 to display insufficient pressure information as a notification that the cartridge cannot be ejected due to insufficient pressing pressure. Insufficient pressure information may include, for example, text such as "insufficient pressing pressure," a pressing pressure value, or a graph representing the pressing pressure. Furthermore, the notification of insufficient pressing pressure is not limited to these displays; it may also include setting the displayed text, the background color to a specific color (e.g., yellow), outputting an error sound, or a combination thereof.

[0107] If a positive determination is made in step S40 and the process proceeds to step S110, and the pressing pressure is outside the specified range, the control circuit 3 causes the display unit 8 to display a "cannot eject" message as a second notification. This "cannot eject" message may include, for example, text such as "cannot eject," the pressing pressure value, or a graph representing the pressing pressure. Furthermore, the second notification may include, for example, setting the displayed text, the background color to a specific color (e.g., red), outputting an error sound, or a combination thereof.

[0108] If a positive determination is made in step S50 and the process proceeds to step S120, the control circuit 3 causes the display unit 8 to display tilt information indicating that the syringe 1 is tilted due to being pressed at an angle. Tilting information may include text such as "too tilted," an icon indicating tilt, etc. Furthermore, tilt notification may include setting the displayed text and background color to a specific color (e.g., blue), outputting an error sound, or a combination thereof. The display unit 8 may also display instructions indicating the correct direction to reposition the syringe.

[0109] <Effects of the Implementation Method>

[0110] (1) When the pressure applied to the injection target area by the syringe 1 in this embodiment reaches a first predetermined value or above, a first determination is made that the driver 20 can operate. As a result, the syringe 1 in this embodiment can inject the target substance while pressing against the injection target area with an appropriate pressure, and can deliver the target substance to the target depth.

[0111] (2) The syringe 1 also includes a notification unit that notifies the user of the result of the first judgment made by the control circuit 3. Thus, the syringe 1 enables the user to control the appropriate pressing pressure.

[0112] (3) If the pressing force detected by the sensor 4 is greater than or equal to a second predetermined value that is greater than the first predetermined value, the control circuit 3 of the syringe 1 makes a second judgment that the driver 20 cannot work. As a result, the syringe 1 can inject with an appropriate pressing force, which can prevent damage to the container or reduce the load on the syringe 1 and avoid malfunction.

[0113] (4) The syringe 1 also includes a notification unit that notifies the user of the result of the first judgment or the result of the second judgment. Thus, the syringe 1 enables the user to control whether the pressure applied is excessive and avoids damage or malfunction caused by excessive pressure.

[0114] (5) When the pressure applied is above the first predetermined value but below the second predetermined value, the notification unit of the syringe 1 issues a first notification; when the pressure applied is above the second predetermined value, the notification unit of the syringe 1 issues a second notification. Furthermore, the contents of the first and second notifications are different from each other. Thus, the syringe 1 allows the user to determine the appropriate range of pressure applied.

[0115] (6) The syringe assembly 10 is detachably mounted on the housing 2, and the sensor 4 is disposed between the syringe assembly 10 and the housing 2. Thus, the sensor 4 does not directly contact the injection target area, allowing for hygienic injection.

[0116] (7) In the syringe 1, multiple sensors 4 are arranged in a position symmetrical about the central axis of the syringe assembly 10. Thus, the sensors 4 can detect the tilt of the syringe 1 relative to the injection target area. Furthermore, by notifying the user of this tilt, the user can grasp the tilt and perform injection in the correct posture so that the syringe 1 is orthogonal to the surface of the injection target area.

[0117] (8) The control circuit 3 stores log data representing the pressure applied when injecting the target substance in the memory, displays the log data on the display unit 8, or sends the log data to an external device. Thus, the syringe 1 can retain a record of the pressure applied during injection, allowing the user to determine the appropriateness of the injection in subsequent verification.

[0118] (9) The control circuit 3 can set a first predetermined value based on at least one of the user's input, the type of the target substance to be injected, the type of container, and the object to be injected. Thus, the syringe 1 can finely set each predetermined value through the user's operation of the operating unit.

[0119] (10) The notification section of the syringe 1 is a display section that shows the pressing pressure in numerical or graphical form. Thus, the syringe 1 enables the user to accurately grasp the pressing pressure through numerical or graphical means.

[0120] <Variation Example>

[0121] Figure 11 This is a diagram showing the configuration of the nozzle 70c in the modified example. Figure 12 This is a diagram showing the positional relationship between sensor 4 and nozzle tip 70c2 in the modified example. Figure 12The upper wall 2f of the receiving space and the nozzle tip 70c2 are shown overlappingly so that the upper wall 2f of the receiving space, on which the sensor 4 is mounted, can be viewed from the top side of the syringe assembly 10 filled in the receiving space 2e. It should be noted that... Figure 12 The socket 7, main body 21, accessory 30, and other components are omitted from the diagram. Furthermore, in... Figure 12 In the figure, the nozzle tip 70c2 is indicated by a double-dotted line. This modified example differs from the first embodiment described above in that it has a configuration with multiple nozzle tip portions 70c2. It should be noted that other configurations are the same as in the first embodiment described above; therefore, identical reference numerals are used for the same elements, and further description is omitted.

[0122] like Figure 11 As shown, in this modified example, the nozzle tip 70c2 has multiple portions at the tip of the nozzle 70c. Figure 11 The example shown is of three nozzle tip portions 70c2, but it is not limited to this; the number of nozzle tip portions 70c2 can also be two, four, or more. Multiple nozzle tip portions 70c2 are arranged around a predetermined axis 70x along the pressing direction of the syringe 1.

[0123] like Figure 12 As shown, the predetermined axis 70x coincides with the predetermined axis 2g located at the center of the plurality of sensors 4. That is, the plurality of sensors 4 are arranged in a position that is rotationally symmetrical about the predetermined axis 70x. Thus, the syringe of this modified example can detect the tilt of the syringe 1 relative to the injection target area. Furthermore, by notifying the user of this tilt, injection can be performed in the correct posture so that the syringe 1 is orthogonal to the surface of the injection target area.

[0124] <Second Implementation>

[0125] This embodiment differs from the first embodiment described above in that it does not fire upon pressing the second switch 6, but rather fires when the timing control circuit 3 is in a firing-ready state. It should be noted that the other components are the same as in the first embodiment described above; therefore, identical reference numerals are used for the same elements, and further description is omitted.

[0126] Figure 13 This is a diagram illustrating the control method of the second embodiment. Figure 13 In the process, steps S10 to S50 are processed and Figure 10 The processing is the same.

[0127] If, in step S50, it is determined that the syringe is not tilted and the process proceeds to step S60A, the control circuit 3 outputs information to warn of the ejection (warning information). For example, the display unit 8 displays the information. Examples of the warning information output include displaying text such as "Ejection timer starts in 5 seconds" or "Ejection preparation complete," or a countdown to ejection. Furthermore, the warning information output may include setting the displayed text and background color to a specific color (e.g., purple), outputting a specific sound, voice, or a combination thereof.

[0128] In step S70A, control circuit 3 determines whether a predetermined time has elapsed since the initial warning. If the determination is positive, it proceeds to step S80; if the determination is negative, it proceeds to step S30. It should be noted that the processing in steps S80 to S120 is similar to... Figure 10 The processing is the same.

[0129] In this way, when the control circuit 3 of this embodiment determines that the driver 20 is operational, it drives the driver 20 to eject the target substance from the nozzle 70c. As a result, the syringe 1 of this embodiment automatically operates at the point in time when the conditions for ejection are met, enabling injections with good reproducibility.

[0130] Furthermore, in this embodiment, the control circuit 3 provides a work advance notice to the user from the time the first judgment is made until the work signal is sent to the driver 20. Therefore, the syringe 1 of this embodiment can communicate the timing of the work to the user, allowing the user to be mentally prepared and thus enabling successful injections without failure.

[0131] Explanation of reference numerals in the attached figures

[0132] 1: Syringe;

[0133] 2: Shell;

[0134] 3: Control circuit;

[0135] 4: Sensors.

[0136] 5: First switch;

[0137] 6: Second switch;

[0138] 7: Socket;

[0139] 8: Display section;

[0140] 9: Cable;

[0141] 10: Syringe assembly;

[0142] 20: Driver;

[0143] 20a: Combustion chamber;

[0144] 21: Main body;

[0145] 21a: Central Department;

[0146] 21b: Top part;

[0147] 21c: Base end;

[0148] 22: Igniter;

[0149] 22b: Ignition lead;

[0150] 22c: Release the surface;

[0151] 26: External thread section;

[0152] 30: Attachments;

[0153] 31: Main body;

[0154] 32: Internal thread section;

[0155] 36: Internal thread section;

[0156] 40: Piston;

[0157] 50: Anti-misalignment component;

[0158] 70: Container;

[0159] 70a: Torso;

[0160] 70c: Nozzle;

[0161] 70c1: Conical part;

[0162] 70c2: Nozzle tip;

[0163] 70c3: Top side outer surface;

[0164] 70x: Standard axis;

[0165] 73: Top face;

[0166] 74: External thread section;

[0167] 75: Accommodation space;

[0168] 75a: Inner wall surface;

[0169] 76: Flow path;

[0170] 77: Ejection port;

[0171] 80: Plunger;

[0172] 81: Plunger rod;

[0173] 82: Stop part;

[0174] 101: Base end face;

[0175] 131: Connecting bus;

[0176] 132: Control Department;

[0177] 133: Memory;

[0178] 134: Input / Output IF;

[0179] 135: Communication I / F;

[0180] 51: Wired IF;

[0181] 52: Wireless IF.

Claims

1. A needle-free injector, comprising: A syringe assembly includes a container and a actuator, the container containing an injectable target substance, and the actuator having a mechanism for pressurizing the injectable target substance to eject the injectable target substance from a nozzle formed at the top of the container. Housing for assembling the syringe assembly; The sensor detects the pressure applied when the nozzle is pressed onto the injection target area; as well as The control circuit acquires the pressing force detected by the sensor, and when the pressing force reaches or exceeds a first predetermined value, the control circuit makes a first determination that the driver can work.

2. The needleless injector according to claim 1, wherein, The needleless injector also includes a notification unit that notifies the user of the result of the first determination made by the control circuit.

3. The needleless injector according to claim 1, wherein, If the pressing force detected by the sensor is greater than or equal to a second predetermined value that is greater than the first predetermined value, the control circuit makes a second determination that the driver cannot work.

4. The needleless injector according to claim 3, wherein, The needle-free injector also includes a notification unit that notifies the user of the result of the first determination or the result of the second determination.

5. The needleless injector according to claim 4, wherein, When the pressing pressure is above the first predetermined value but less than the second predetermined value, the notification unit sends a first notification to the user; when the pressing pressure becomes above the second predetermined value, the notification unit sends a second notification to the user. The contents of the first notification and the second notification are different.

6. The needleless injector according to claim 1, wherein, The syringe assembly is detachably assembled to the housing. The sensor is disposed between the syringe assembly and the housing.

7. The needleless injector according to claim 6, wherein, The plurality of sensors are configured in a position symmetrical about the central axis of the syringe assembly.

8. The needleless injector according to claim 6, wherein, In the nozzle, a plurality of nozzle tips containing injection outlets of the target substance are arranged about a predetermined axis along the pressing direction on the injection target area. The plurality of said sensors are arranged in a position symmetrical about the specified axis.

9. The needleless injector according to claim 1, wherein, The control circuit causes the memory to store log data representing the pressure applied when the injected target substance is ejected, causes the display to display the log data, or sends the log data to an external device.

10. The needleless injector according to claim 1, wherein, The control circuit can set the first predetermined value based on at least one of the user input, the type of the target substance to be injected, the type of the container, and the object to be injected.

11. The needleless injector according to claim 2, 4 or 5, wherein, The notification section is a display section that shows the pressing pressure in numerical or graphical form.

12. The needleless injector according to any one of claims 1 to 10, wherein, If the driver is determined to be functional, the control circuit drives the driver to eject the target substance from the nozzle.

13. The needleless injector according to claim 12, wherein, The control circuit provides a work notification to the user from the time the first determination is made until the work signal is sent to the driver.

Images