Needleless syringe

Abstract

The present invention relates to a needleless syringe. A liquid medicine nozzle comprises: a tube having an inner space for storing liquid medicine and a discharge orifice formed at the front end thereof; and a plunger moving forward in a state in which an opening at the rear end of the tube is sealed, and thereby enabling the liquid medicine in the tube to be jetted through the discharge orifice. A housing accommodates the plunger with the tube supported in a nozzle mounting port at the front thereof. A piston pushes the plunger forward as the piston moves forward. A loading block moves backward while being in contact with the front end of the piston, so as to move same backward to a loading position. A locking mechanism locks or unlocks the piston at the loading position. A spring for the piston is elastically deformed as the piston moves backward and, once the piston is unlocked at the loading position, moves the piston forward by the elastic force. A linear actuator moves the loading block backward and forward. A control part controls the linear actuator according to a user command inputted via an operation part.

Description

needleless syringe

[0001] The present invention relates to a needleless syringe, and more specifically, to a needleless syringe that enables the administration of a liquid drug to the dermis layer by a jet injection method without a needle.

[0002] Today, modern people suffer from nutritional and exercise imbalances due to a lack of physical activity, leading to an increase in the incidence of metabolic syndrome. In the case of diabetes, a type of metabolic disease, it is emerging as a social issue as the frequency of occurrence expands from being predominantly among adult men to include various age groups and genders.

[0003] When diabetes is treated appropriately at the right time, there is a very high possibility that symptoms will be alleviated, and patients will not face significant difficulties in carrying out daily life and economic activities.

[0004] It is common for diabetic patients to use insulin syringes or insulin pens to administer insulin. With these insulin syringes or insulin pens, the user (patient) inserts the needle directly into the skin and injects the insulin stored inside into the skin.

[0005] However, the method of administering insulin using a needle causes pain to the patient. In particular, since insulin administration for diabetic patients is performed regularly, the frequent use of needles causes significant suffering to the patient. Considering these circumstances comprehensively, there is a need for a solution that enables smooth diabetes management while minimizing the patient's pain and suffering in daily life.

[0006] In this regard, there is a technology as disclosed in Registered Patent Publication No. 10-2187368 (published April 17, 2020).

[0007]

[0008] The objective of the present invention is to provide a needleless syringe that can minimize pain and suffering compared to the injection needle method and increase ease of use.

[0009]

[0010] A needleless syringe according to the present invention for achieving the above objectives comprises a liquid medicine nozzle, a housing, a piston, a loading block, a locking mechanism, a spring for the piston, a linear actuator, and a control unit. The liquid medicine nozzle comprises a tube having an internal space for storing liquid medicine and a spray hole formed at its tip, and a plunger that moves forward while sealing the rear opening of the tube, thereby causing the liquid medicine inside the tube to be sprayed from the spray hole. The housing accommodates the plunger in its internal space while supporting the tube at a front nozzle mounting port.

[0011] As the piston moves forward within the housing, it pushes the plunger forward. The loading block moves backward within the housing while in contact with the tip of the piston to move the piston to the loading position. A locking mechanism locks or unlocks the piston at the loading position. The piston spring undergoes elastic deformation as the piston moves backward, and when the piston is released from the loading position, the elastic force moves the piston forward. A linear actuator is mounted within the housing to move the loading block back and forth. The control unit controls the linear actuator according to user commands input through the operating unit.

[0012] Here, the control unit can adjust the forward and backward position of the loading block by means of a linear actuator according to the amount of liquid administered through the operating unit, thereby controlling the distance the piston moves forward from the loading position.

[0013] The locking mechanism may include a pin, an operating shaft, and a spring for the operating shaft. The pin has a hollow structure and is formed so that balls can protrude or retract through pin holes formed on its side while being prevented from coming loose, and can be fixed within the housing by being elongated in the front-rear direction.

[0014] The operating shaft is inserted into the hollow of the pin such that its rear portion protrudes from the rear opening of the pin, and moves in the forward and backward directions. A ball insertion groove is formed on its outer surface to allow balls to be inserted. In the locked position, the balls are maintained protruding from the pin holes, and in the unlocked position, the balls can be inserted from the pin holes into the ball insertion groove. A spring for the operating shaft can return the operating shaft from the unlocked position to the locked position.

[0015] The piston is guided to move in the forward and backward directions by a pin with a pin inserted into a hollow that is open at the rear end, and may include a locking groove formed on the inner surface of the hollow to insert balls at the loading position.

[0016]

[0017] According to the needleless syringe of the present invention, since the liquid medication is administered to the dermis layer using a jet injection method without a needle, pain and suffering can be minimized compared to the needle method.

[0018] According to the needleless syringe of the present invention, since the piston can be moved to the loading position and the forward movement distance of the piston can be adjusted using the power of a linear actuator, the convenience of use can be improved compared to using a separate manual mechanism.

[0019] In addition, according to the needleless syringe of the present invention, when used for insulin administration, the dosage can be adjusted according to blood glucose levels, and since it is convenient to carry, it is possible to easily administer the required amount of medication without being restricted by place or time.

[0020]

[0021] FIG. 1 is a perspective view of a needleless syringe according to one embodiment of the present invention.

[0022] FIG. 2 is a side view showing the interior of a needleless syringe in FIG. 1.

[0023] FIG. 3 is a perspective view showing the interior of a needleless syringe in FIG. 2.

[0024] FIG. 4 is a perspective view showing a part of the needleless syringe in FIG. 3.

[0025] FIGS. 5a to 5c are drawings for explaining the configuration and operation of the locking mechanism illustrated in FIG. 3.

[0026] FIGS. 6a to 6d are drawings for explaining an example of operation of a needleless syringe according to one embodiment of the present invention.

[0027] FIGS. 7a and 7b are drawings to explain an example of the operation of a needleless syringe when the dosage of the drug solution is set differently in FIG. 6b.

[0028]

[0029] The present invention will be described in detail below with reference to the attached drawings. Here, the same reference numerals are used for identical components, and repetitive descriptions and detailed descriptions of known functions and components that could unnecessarily obscure the essence of the invention are omitted.

[0030] The embodiments of the present invention are provided to more fully explain the invention to those with average knowledge in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clearer explanation.

[0031] FIG. 1 is a perspective view of a needleless syringe according to an embodiment of the present invention. FIG. 2 is a side view showing the interior of the needleless syringe in FIG. 1. FIG. 3 is a perspective view showing the interior of the needleless syringe in FIG. 2. FIG. 4 is a perspective view showing a part of the needleless syringe in FIG. 3. Here, terms indicating direction, such as 'tip' and 'rear end', are used for convenience of explanation and are not limited to those terms.

[0032] Referring to FIGS. 1 to 4, a needleless syringe (100) according to one embodiment of the present invention includes a liquid medicine nozzle (110), a housing (120), a piston (130), a loading block (140), a locking mechanism (150), a spring for the piston (160), a linear actuator (170), and a control unit (180).

[0033] The liquid medicine nozzle (110) is equipped with a tube (111) and a plunger (112). The tube (111) has an internal space for storing the liquid medicine. Here, the liquid medicine may be insulin, etc. A spray hole (111a) is formed at the tip of the tube (111). The spray hole (111a) allows the liquid medicine inside the tube (111) to be sprayed in a jet form while the tip of the tube (111) is in contact with the patient's skin, thereby enabling the sprayed liquid medicine to be easily injected into the dermis layer of the patient.

[0034] The tube (111) has an open rear end. The tube (111) may have a flange (111b) formed along the outer circumference of the rear end. The tube (111) is made of a transparent material and has a scale formed on its outer surface, allowing the user to easily check the amount of liquid in the internal space.

[0035] As the plunger (112) moves forward while sealing the rear opening of the tube (111), the liquid medicine inside the tube (111) is sprayed from the spray hole (111a). As the plunger (112) moves forward while maintaining a seal with the inner surface of the tube (111) by means of a packing provided at the tip, the liquid medicine inside the tube (111) can be pushed into the spray hole (111a).

[0036] The housing (120) is configured to accommodate a liquid nozzle (110), a piston (130), a loading block (140), a locking mechanism (150), a spring for the piston (160), a linear actuator (170), and a control unit (180). The housing (120) has an internal space. The housing (120) accommodates a plunger (112) while supporting a tube (111) in a front nozzle mounting port (121).

[0037] The nozzle mounting port (121) may be formed in a manner in which the front port portion (122) and the side port portion (123) are connected. The front port portion (122) is formed at the front end of the housing (120) to communicate with the internal space of the housing (120). The side port portion (123) is formed on the front side of the housing (120) to communicate with the internal space of the housing (120) and is connected to the front port portion (122).

[0038] The side port portion (123) allows the plunger (112) to be received into the housing (120) through the rear opening and the rear portion of the tube (111) to be received into the front port portion (122) through the front opening. The front port portion (122) is configured to allow the tube (111) of the liquid medicine nozzle (110) to be attached and detached in a sliding manner. The front port portion (122) may have a support groove (122a) formed to insert or detach the flange (111b) of the tube (111) in a horizontal direction. Such a nozzle mounting port (121) allows the liquid medicine nozzle (110) to be easily replaced.

[0039] As the piston (130) moves forward within the housing (120), it pushes the plunger (112) forward. The piston (130) can push the plunger (112) forward as it moves forward with its front end in contact with the rear end of the plunger (112). The front end of the piston (130) can come into contact with the rear end of the plunger (112) as it passes through the loading block (140) while in contact with the rear portion of the loading block (140).

[0040] A head having an outer diameter larger than that of the central portion of the piston (130) may be formed at the tip of the piston (130). The head of the piston (130) may support the tip portion of the piston spring (160) that surrounds the piston (130). The piston (130) may be guided to move in the forward and backward directions by a locking mechanism (150) mounted within the housing (120).

[0041] The loading block (140) moves backward within the housing (120) while in contact with the leading edge of the piston (130) to move the piston (130) backward to the loading position. The loading block (140) may be equipped with a base block portion (141) and a guide block portion (142).

[0042] The base block portion (141) is formed to contact the tip of the piston (130) at the rear portion and is connected to the movable rod (173) of the linear actuator (170). The base block portion (141) may have a hole through which the plunge (112) passes.

[0043] The base block (141) can move backward while in contact with the tip of the piston (130) to move the piston (130) backward to the loading position. When the piston (130) moves to the loading position, the base block (141) can be separated from the tip of the piston (130) by a distance set according to the amount of liquid administered, and then stop the piston (130) from moving forward from the loading position for liquid injection.

[0044] The guide block portion (142) is connected to the base block portion (141). The guide block portion (142) can be guided to move linearly in the forward and backward directions by a linear guide (143). The linear guide (143) may be equipped with a rail (143a) and a slider (143b). The rail (143a) may be arranged lengthwise in the forward and backward directions and fixed to the inner surface of the housing (120). The slider (143b) may be coupled to the rail (143a) to move linearly along the rail (143a) and fixed to the guide block portion (142).

[0045] The guide block portion (142) may have a concave curved surface with a set curvature on the surface facing the piston (130). The concave curved surface of the guide block portion (142) can stably support the forward movement of the piston (130) while in contact with the head of the piston (130).

[0046] The locking mechanism (150) locks or unlocks the piston (130) in the loaded position. An example of the locking mechanism (150) will be described later.

[0047] The piston spring (160) elastically deforms as the piston (130) moves backward, and when the piston (130) is released from the loaded position, it moves the piston (130) forward by means of elastic force. The piston spring (160) moves the piston (130) forward and pushes the plunger (112), thereby enabling the liquid medicine in the tube (111) to be sprayed through the injection hole (111a) of the tube (111).

[0048] For example, the piston spring (160) may be made of a compression coil spring. The piston spring (160) may be wrapped around the piston (130), with its front end supported by the head of the piston (130) and its rear end supported by the inner wall of the housing (120). As another example, the piston spring (160) may be made of various types of springs, such as a disk spring.

[0049] A linear actuator (170) is mounted within the housing (120) to move the loading block (140) forward and backward. The linear actuator (170) can move the loading block (140) backward to move the piston (130) to the rearward loading position. The linear actuator (170) can adjust the position of the loading block (140) to adjust the forward movement distance of the piston (130) according to the amount of liquid administered.

[0050] For example, a linear actuator (170) may include a motor (171), a motion conversion mechanism (172), and a movable rod (173). The motor (171) generates forward and reverse rotational force. The motor (171) is controlled by a control unit (180). The rotational speed and rotational direction of the motor (171) can be detected by an encoder. The control unit (180) can control the motor (171) based on information detected from the encoder. The motor (171) is fixed in a rear area within the housing (120).

[0051] The motion conversion mechanism (172) may include a screw and a nut. The screw rotates by receiving rotational force from the motor (171). The motor (171) may transmit rotational force to the screw by means of a gear set. The screw may be housed in a casing fixed to the body of the motor (171) and may be rotatably supported by a bearing. The casing is fixed to a front area within the housing (120) so that the screw is positioned lengthwise in the front-rear direction.

[0052] The nut is supported within the casing so that it can move in the forward and backward directions while having a rotational restriction. The nut is coupled to the screw and can move forward and backward by the forward and reverse rotation of the screw.

[0053] The movable rod (173) has a hollow structure and can secure a nut at its rear end, which penetrates the front portion of the casing. The movable rod (173) can insert a shaft that penetrates the nut into the hollow through the rear opening. The movable rod (173) connects a loading block (140) to its front end. The movable rod (173) can move the loading block (140) in the forward and backward directions by extending forward from the casing according to the forward movement of the nut, or by contracting backward into the casing according to the rearward movement of the nut.

[0054] Limit switches may be installed within the casing. The limit switches detect limiting positions of the operating rod (173) and provide them to the control unit (180). The control unit (180) may limit the operating range of the operating rod (173) based on the information provided from the limit switches. Meanwhile, the linear actuator (170) may be made of various known configurations.

[0055] The control unit (180) controls the linear actuator (170) according to a user command input through the operation unit (186). The control unit (180) can move the loading block (140) in the forward and backward directions by controlling the linear actuator (170).

[0056] The control unit (180) may be embedded in a control box (126) provided in the housing (120). The operation unit (186) may be mounted on the outside of the control box (126). The operation unit (186) may include buttons (187) for inputting various commands, such as power on / off commands and commands for setting the dosage of medicine. The operation unit (180) may display the command status through a display (188). The operation unit (180) may be composed of a touch panel or the like for inputting commands via touch.

[0057] A rechargeable battery (181) that supplies power to a control unit (180) may be built into the control box (126). The control box (126) may be equipped with a charging terminal connected to a charger to charge the battery. The battery (181) and the charging terminal are circuitously connected to the control unit (180).

[0058] The charging terminal is configured to be connected to a USB type charger used for mobile phones. Therefore, the needleless syringe (100) can be conveniently charged and used anywhere mobile phones can be charged. The remaining amount of the battery (181) is displayed through the display (188), allowing the user to conveniently check whether it is being charged.

[0059] The control unit (180) can adjust the forward and backward position of the loading block (140) by means of a linear actuator (170) according to the amount of liquid medicine administered through the operating unit (186), thereby adjusting the distance the piston (130) moves forward from the loading position. The control unit (180) can increase or decrease the amount of liquid medicine administered by increasing or decreasing the distance the loading block (140) is separated from the piston (130) by means of a linear actuator (170).

[0060] Insulin has the characteristic that the amount of liquid medication must be adjusted and administered according to conditions such as blood sugar, the patient's height and weight, and age. In this embodiment, since the forward movement distance of the piston (130) can be controlled according to the amount of liquid medication administered, the amount of liquid medication administered can be precisely adjusted to administer an optimal amount according to the patient's condition.

[0061] FIGS. 5a to 5c are drawings for explaining the configuration and operation of the locking mechanism illustrated in FIG. 3.

[0062] Referring to FIGS. 5a to 5c, a locking mechanism (150) according to one example may include a pin (151), an operating shaft (152), and a spring (153) for the operating shaft.

[0063] The pin (151) has a hollow structure. The pin (151) can be positioned lengthwise in the front-rear direction and fixed within the housing (120). The pin (151) may have a circular outer surface. The pin (151) may have a constant outer diameter at the front portion and a larger outer diameter at the rear portion than at the front portion.

[0064] The rear portion of the pin (151) can be exposed to the outside of the housing (120) by being inserted into and fixed in the through hole of the housing (120). The pin (151) is formed so that the balls (154) can each protrude or enter through the pin holes (151a) formed on the side, while being prevented from falling out. The pin holes (151a) are formed in the front portion of the pin (151).

[0065] The operating shaft (152) is inserted into the hollow of the pin (151) so that its rear portion protrudes from the rear opening of the pin (151) and moves in the forward and backward directions. The operating shaft (152) may have a circular outer surface. The operating shaft (152) may have a front portion with a constant outer diameter.

[0066] The rear portion of the operating shaft (152) may include a first enlarged portion extending from the front portion of the operating shaft (152) having an outer diameter larger than that of the front portion of the operating shaft (152), and a second enlarged portion extending from the first enlarged portion having an outer diameter larger than that of the first enlarged portion.

[0067] The rear portion of the operating shaft (152) can be inserted into the rear hollow of the pin (151) such that the second enlarged portion partially protrudes from the rear hollow of the pin (151). The outer surface of the first enlarged portion of the operating shaft (152) is spaced apart from the inner surface of the rear hollow of the pin (151) to form a space, thereby allowing a spring (153) for the operating shaft to be mounted in the spaced-apart space.

[0068] The operating shaft (152) has a ball insertion groove (152a) formed on its outer surface to insert balls (154). The ball insertion groove (152a) is formed on the front portion of the operating shaft (152). The operating shaft (152) maintains the balls (154) protruding from the pin holes (151a) in the locked position, and can insert the balls (154) from the pin holes (151a) into the ball insertion groove (152a) in the unlocked position. The operating shaft (152) can move backward from the unlocked position to the locked position.

[0069] The spring (153) for the operating shaft can return the operating shaft (152) from an unlocked position to a locked position. The spring (153) for the operating shaft may be made of a compression coil spring. The spring (153) for the operating shaft may be positioned to wrap around the first enlarged portion of the operating shaft (152). The rear end of the spring (153) for the operating shaft may be supported on the outer jaw of the operating shaft (152), and the front end of the spring (153) for the operating shaft may be supported on the inner jaw of the pin (151).

[0070] When the operating shaft (152) moves forward from the locked position to the unlocked position, the spring (153) for the operating shaft is elastically deformed to generate an elastic force that moves the operating shaft (152) backward.

[0071] The piston (130) is guided to move in the forward and backward directions by the pin (151) with the pin (151) inserted into the hollow at the rear end. The piston (151) inserts the front portion of the pin (151) into the hollow. The piston (130) may include a locking groove (131) formed on the inner surface of the hollow to insert balls (154) in the loading position.

[0072] The aforementioned locking mechanism (150) can operate as follows. As illustrated in FIG. 5a, when the operating shaft (152) moves forward to the release position, the ball insertion groove (152a) of the operating shaft (152) corresponds to the pin holes (151a) of the pin (151) to enable the insertion of balls (154). At this time, the spring (153) for the operating shaft is elastically deformed to generate an elastic force that attempts to move the operating shaft (152) backward.

[0073] In this state, the piston (130) is assembled to the pin (151) by inserting the front portion of the pin (151) into the hollow. Then, the balls (154) are pushed by the inner circumference of the hollow of the piston (130) and remain inserted in the ball insertion groove (152a) of the operating shaft (152), so that the piston (130) can be guided to move backward along the pin (151). At this time, since the operating shaft (152) receives an elastic force backward by the operating shaft spring (153), the balls (154) receive the force applied by the operating shaft (152) and are pressed against the inner circumference of the hollow of the piston (130).

[0074] In this state, as illustrated in FIG. 5b, when the piston (130) moves backward to the loading position, the spring (160) for the piston is elastically deformed, and the balls (154) correspond to the locking groove (131) of the piston (130).

[0075] Then, as shown in FIG. 5c, the balls (154) are pushed out of the ball insertion groove (152a) of the operating shaft (152) by the force applied by the operating shaft (152) and then pop out of the pin holes (151a) and inserted into the locking groove (131) of the piston (130). Then, the operating shaft (152) moves backward to the locked position by the elastic force of the spring (153) for the operating shaft.

[0076] In this process, the balls (154) are pushed by the outer surface of the operating shaft (152) and remain inserted into the locking groove (131) of the piston (130), so that the piston (130) can be locked against the pin (151). At this time, since the piston (130) receives an elastic force forward by the piston spring (160), the balls (154) are pushed by the force of the piston (130) and are pressed against the outer surface of the operating shaft (152).

[0077] In this state, when the rear end of the operating shaft (152) is pressed forward, the ball insertion groove (152a) of the operating shaft (152) corresponds to the balls (154). Then, the balls (154) are pushed out of the locking groove (131) of the piston (130) by the force applied by the piston (130) and inserted into the ball insertion groove (152a) of the operating shaft (152). Then, the piston (130) can move forward by the elastic force of the piston spring (160) after being released from the loaded position.

[0078] FIGS. 6a to 6d are drawings for explaining an example of operation of a needleless syringe according to one embodiment of the present invention.

[0079] As illustrated in FIG. 6a, when the user turns on the power through the control unit (186), the linear actuator (170) retracts the movable rod (173) backward to move the loading block (140) backward. As the loading block (140) moves backward, it pushes the piston (130) backward to the loading position, at which point the piston (130) is locked to the pin (151) of the locking mechanism (150) and waits. At this time, the spring (160) for the piston is deformed into a compressed state. The rear portion of the operating shaft (152) of the locking mechanism (150) protrudes backward from the pin (151).

[0080] Subsequently, as illustrated in FIG. 6b, the user inserts the liquid nozzle (110) into the nozzle mounting port (121) of the housing (120). At this time, the tube (111) is supported by the nozzle mounting port (121), and the rear end of the plunger (112) corresponds to the front end of the piston (130).

[0081] Afterward, as illustrated in FIG. 6c, when the user inputs the amount of liquid to be administered through the control unit (186) and completes the setting, the linear actuator (170) extends the operating rod (173) forward to move the loading block (140) forward from the tip of the piston (130) by a distance calculated according to the amount of liquid to be administered.

[0082] Subsequently, as illustrated in FIG. 6d, when the user presses the rear end of the operating shaft (152) of the locking mechanism (150), the piston (130) is released from the pin (151) of the locking mechanism (150). Then, the piston (130) moves forward by the elastic force of the piston spring (160) and comes into contact with the loading block (140) and stops.

[0083] In this process, the plunger (112) moves forward by the forward travel distance of the piston (130) to spray the liquid medicine in the tube (111) from the injection hole (111a) of the tube (111) in a set dosage amount. Afterward, when the administration of the liquid medicine is finished, the linear actuator (170) retracts the movable rod (173) backward to move the loading block (140) backward, thereby returning the piston (130) to the loading position.

[0084] FIGS. 7a and 7b are drawings to explain an example of the operation of a needleless syringe when the dosage of the drug solution is set differently in FIG. 6b.

[0085] As illustrated in FIG. 7a, when the user inputs an increased drug dosage through the control unit (186) and completes the setting, the linear actuator (170) extends the operating rod (173) forward to further move the loading block (140) forward from the tip of the piston (130) by a distance calculated according to the increased drug dosage. Thus, the loading block (140) can increase the forward travel distance of the piston (130).

[0086] Subsequently, as illustrated in FIG. 7b, when the user presses the rear end of the operating shaft (152) of the locking mechanism (150), the piston (130) is released from the pin (151) of the locking mechanism (150). Then, the piston (130) moves forward by the elastic force of the piston spring (160) and comes into contact with the loading block (140) that is further away and stops.

[0087] In this process, the plunger (112) moves further forward as the forward travel distance of the piston (130) increases, so that the liquid medicine in the tube (111) can be injected from the injection hole (111a) of the tube (111) with an increased dosage.

[0088] As such, the needleless syringe (100) of the present embodiment is characterized by being configured as a hybrid type, as it uses an electric and electronic control method by a linear actuator (170) for returning the piston (130) to its initial state and adjusting the forward distance of the piston (130), and a mechanical method by a piston spring (160) for moving the piston (130) for injecting the liquid medicine.

[0089] According to the needleless syringe (100) of the present embodiment, since the liquid medicine is administered to the dermis layer using a jet injection method without a needle, pain and suffering can be minimized compared to the needle method.

[0090] According to the needleless syringe (100) of the present embodiment, the piston (130) can be moved to the loading position and the forward movement distance of the piston (130) can be adjusted using the power of the linear actuator (170), thereby increasing the convenience of use compared to using a separate manual mechanism.

[0091] In addition, according to the needleless syringe (100) of the present embodiment, when used for insulin administration, the dosage can be adjusted according to blood glucose levels, and since it is convenient to carry, it is possible to easily administer the required amount of liquid medicine without being restricted by place or time.

[0092] The present invention has been described with reference to an embodiment illustrated in the accompanying drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

Claims

1. A liquid medicine nozzle comprising a tube having an internal space for storing liquid medicine and a spray hole formed at a tip, and a plunger that moves forward while sealing the rear opening of the tube, thereby causing the liquid medicine inside the tube to be sprayed from the spray hole; A housing that accommodates the plunger while supporting the tube at a front nozzle mounting port; A piston that pushes the plunger forward as it moves forward within the housing; A loading block that moves backward while in contact with the tip of the piston within the housing to move the piston backward to the loading position; A locking mechanism for locking or unlocking the above piston in the loaded position; A piston spring that elastically deforms as the piston moves backward, and moves the piston forward by elastic force when the piston is released from the loaded position; A linear actuator mounted within the above housing to move the loading block forward and backward; and A control unit that controls the linear actuator according to user commands input through an operating unit; A needleless syringe containing 2. In Paragraph 1, A needleless syringe characterized by the above-described control unit adjusting the forward and backward position of the loading block by the linear actuator according to the amount of liquid administered through the above-described operating unit, thereby adjusting the distance the piston moves forward from the loading position.

3. In Paragraph 1, The above locking mechanism is, A pin having a hollow structure, formed so that balls can protrude or enter through pin holes formed on the side while being prevented from escaping, and arranged lengthwise in the front-rear direction and fixed within the housing; An operating shaft inserted into the hollow of the pin and moving in the forward and backward directions such that the rear portion protrudes from the rear opening of the pin, and having a ball insertion groove formed on its outer surface for inserting the balls, maintaining the balls in a state protruding from the pin holes in the locked position, and inserting the balls from the pin holes into the ball insertion groove in the unlocked position; and Includes a spring for an operating shaft that returns the operating shaft from an unlocked position to a locked position; A needleless syringe characterized in that the above piston is guided to move in the forward and backward directions by the pin while the pin is inserted into a hollow with an open rear end, and includes a locking groove formed on the inner surface of the hollow to insert the balls at the loading position.

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