CN218852891U

CN218852891U - Needleless injector

Info

Publication number: CN218852891U
Application number: CN202221719614.1U
Authority: CN
Inventors: 张玉良; 王华宾; 张安杰; 宁文龙; 张艺萌
Original assignee: Muyuan Foods Co Ltd
Current assignee: Muyuan Foods Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2023-04-14
Anticipated expiration: 2032-07-04

Abstract

The utility model relates to a needleless injector, which comprises an injector main body, a push rod is slidably assembled in the injector main body along the front-back direction, the front part of the push rod is provided with a piston head which is hermetically matched with the injector main body to form a liquid storage cavity, and the front end of the injector main body is provided with an injection nozzle and a medicine inlet which are communicated with the liquid storage cavity; be equipped with spacing subassembly on the syringe main part, spacing subassembly can restrict the distance that the push rod moved backward to adjust the maximum volume in stock solution chamber, correspond to the liquid medicine of inhaling required injection specification, realize that a needleless syringe can satisfy the demand of multiple dosage injection specification. The utility model discloses a needleless injector, when the different injection dosage demands of the same race or different kind medicine, only need to adjust the distance that the push rod moved backward through spacing subassembly and can obtain different volumetric stock solution chambeies, need not to purchase, change the syringe of other ranges and can accomplish injection work, reduced the application cost, increased needleless injector's application range.

Description

Needleless injector

Technical Field

The present invention relates generally to the technical field of medical devices. More particularly, the present invention relates to a needleless injector.

Background

The traditional syringe with needle is used for injecting medicine by penetrating the body through the needle head, which is generally used for subcutaneous or intramuscular injection, and the syringe with needle has deeper needle penetration depth and has larger damage to the body of an injected object. In the breeding industry, livestock is often required to be immunized by various vaccines in different stages of livestock breeding, and when the livestock is inoculated with the vaccines, an operator is required to pierce the skin of the livestock by a needle of a needle injector and manually push the injector to push the medicines into the livestock. The method has the problems of large damage caused by acupuncture and high requirement on manual injection, and the injection process can cause large stimulation to livestock. If the injection process is not standard, pustules are easily generated at the parts of the inoculated livestock which receive the injection, and finally meat products are produced to be unusable meat blocks, so that the meat value is reduced, and the profit achievement is influenced.

To alleviate the injury and irritation of the injected subject from the injection process, more and more needleless injectors have become widely used in the medical industry. The needle-free injector has the working principle that the power structure provides driving force for the medicine to be injected, the medicine moving at high speed can pierce the skin of the injected object, and the medicine is dispersed and absorbed under the skin. The injection process of the needleless injector reduces the pain feeling during injection and can reduce the irritation to the injected object during injection. Can also improve the bioavailability of the medicine in vivo, shorten the onset time of the medicine and reduce the cost. In the breed trade, can effectively practice thrift the use of medicine, alleviate operating personnel's the amount of labour, can not cause the injury by the livestock simultaneously, ensured out the meat quality, ensured brand benefit and profit and reached.

The prior art, such as patent CN204890827U, relates to a fixed-dose needleless injector, which simplifies the structure of the injector and makes the loading process very convenient. However, in the face of injecting different drugs, the required injected dose is also different. For example, the injection dose of the drug a is 1mL when using a needleless injector, the injection dose of the drug b is 2mL when using a needleless injector, and multiple injections are required when injecting the drug b. Meanwhile, if other injection requirements of specifications such as 1.5mL and 0.5mL exist, the power device of the needleless injector is mostly controlled by the power spring, so when a medicine with a larger injection requirement is inhaled, if the injection requirement is 1.5mL and the range of the injector is 2mL, the injector can only completely eject 2mL of medicine at one time, and accurate and controllable injection of the target injection quantity of the medicine cannot be realized.

From the above, the current needleless injector has a significant advantage over the needle injector in that it reduces the damage and irritation to the subject to be injected. However, when different dosage injection requirements are met, the needleless injector with a single injection range cannot meet the requirements at the same time, and the injector with different injection ranges needs to be replaced for injection, so that the application cost is increased and the application range is limited due to the use of different needleless injectors.

SUMMERY OF THE UTILITY MODEL

The utility model provides a needleless injector to solve when facing different injection dosage demands, need change corresponding injection range syringe, improved the problem of injection cost according to different injection demands.

In order to solve the above problem, the utility model provides a following technical scheme:

a needleless injector comprising:

the syringe body extends along the front-back direction in the axial direction, a push rod is slidably assembled in the syringe body along the front-back direction, the front part of the push rod is provided with a piston head which is in sealing fit with the syringe body to form a liquid storage cavity, and the front end of the syringe body is provided with an injection nozzle and a medicine inlet which are communicated with the liquid storage cavity;

the syringe main body is provided with a limiting assembly for limiting the backward moving distance of the push rod, and the limiting assembly comprises an adjusting sleeve and a locking piece;

the adjusting sleeve is coaxially sleeved outside the push rod and is fixedly arranged in the injector main body in a position-adjustable manner along the front-back direction; and

the locking piece, its edge the radial movably assembly of adjusting collar is in on the adjusting collar, the locking piece has push rod locking position and push rod unblock position on its activity stroke, is in the locking piece at push rod locking position is used for the embedding in order to restrict push rod retrodisplacement distance in the spacing hole on the push rod outer wall, is in the locking piece at push rod unblock position is used for deviating from spacing hole is in order to unblock push rod.

In one embodiment, the locking member is a steel ball;

the limiting assembly comprises an unlocking sleeve and a locking elastic piece;

the unlocking sleeve is movably sleeved outside the adjusting sleeve along the front-back direction, the unlocking sleeve is provided with a steel ball locking position and a steel ball unlocking position on the movable stroke, the unlocking sleeve at the steel ball locking position is used for jacking the steel balls at the push rod locking position in the radial direction of the adjusting sleeve, and the unlocking sleeve at the steel ball unlocking position is used for avoiding the steel balls in the radial direction of the adjusting sleeve so that the steel balls can move to the push rod unlocking position; and

and the locking elastic piece is used for applying elastic acting force which moves towards the steel ball locking position to the unlocking sleeve so as to press the steel ball to the push rod locking position.

In one embodiment, the limiting assembly comprises a front trigger sleeve used for being pushed and triggered to move backwards by the skin of an injection subject during injection of the needleless injector, and the front trigger sleeve is in synchronous transmission connection with the unlocking sleeve so that when the front trigger sleeve moves backwards, the unlocking sleeve is driven to move backwards synchronously to realize unlocking.

As an embodiment, a rear trigger sleeve is slidably assembled on the syringe body along the front-rear direction, the rear trigger sleeve is fixedly assembled with the unlocking sleeve, and a trigger rod extending along the front-rear direction and arranged on the front trigger sleeve is fixedly connected with the rear trigger sleeve, so that the front trigger sleeve is in synchronous transmission connection with the unlocking sleeve through the trigger rod and the rear trigger sleeve.

In one embodiment, a power storage threaded sleeve is sleeved in the rear trigger sleeve, a fixing pin is fixedly assembled on the power storage threaded sleeve, and a long hole through which the fixing pin passes is formed in the syringe main body and extends in the front-rear direction to allow the fixing pin to slide back and forth.

As an implementation mode, the outer fixed cover of syringe main part is equipped with middle trigger cover, and this middle trigger cover is located between preceding trigger cover and the back trigger cover, the trigger bar with middle trigger cover is along the movable direction of fore-and-aft direction assembly.

As an embodiment, the syringe main body comprises a main sleeve body, and the limiting component comprises a connecting sleeve, a rotating inner sleeve and a rotating outer sleeve;

the connecting sleeve is fixedly assembled with the main sleeve body;

the rotating inner sleeve is in transmission connection with the connecting sleeve through threads;

one end of the rotating outer sleeve is fixedly assembled with the rotating inner sleeve, the other end of the rotating outer sleeve is fixedly assembled with the adjusting sleeve, and the rotating outer sleeve is provided with a rotating adjusting portion so as to drive the rotating inner sleeve to rotate when the rotating outer sleeve is driven to rotate, and further drive the rotating inner sleeve, the rotating outer sleeve and the adjusting sleeve to move back and forth.

As an embodiment, the rotating outer sleeve has an inner ring platform, the front side of the inner ring platform is in stop fit with the rear end of the rotating inner sleeve, the adjusting sleeve is located in the rotating outer sleeve, and the rear side of the inner ring platform is in stop fit with the front end of the adjusting sleeve.

As an embodiment, the adjusting sleeve is located in the rotating outer sleeve, a blocking piece is fixedly assembled at the rear end of the rotating outer sleeve, the blocking piece is in blocking fit with the rear end of the adjusting sleeve, and the locking elastic member is a pressure spring with a front end in abutting fit with the unlocking sleeve and a rear end in abutting fit with the blocking piece.

As an implementation manner, an anti-dropping and limiting structure is arranged between the rotating outer sleeve and the connecting sleeve, and the anti-dropping and limiting structure includes a hole check ring arranged on an inner circumferential surface of the rotating outer sleeve and a flange arranged at a rear end of the connecting sleeve, and the flange is used for being in stop fit with the hole check ring.

Has the beneficial effects that:

the utility model provides a needleless injector, it includes the syringe main part that the axial extends along the fore-and-aft direction, is equipped with spacing subassembly in the syringe main part, and this spacing subassembly can restrict the distance that the push rod moved backward to adjust the biggest volume in stock solution chamber, the liquid medicine of the required injection specification is inhaled in the correspondence, realizes that a needleless injector can satisfy the demand of multiple dosage injection specification. The utility model discloses a needleless injector, when the different injection dosage demands of the same race or different kind medicine, only need to adjust the distance that the push rod moved backward through spacing subassembly and can obtain different volumetric stock solution chambeies, wash the medicine mouth and the stock solution chamber that advance of this needleless injector and can inhale the medicine that needs to be changed once more or change the medicine of dosage, need not to purchase, change the syringe of other ranges can accomplish injection work, application cost has been reduced, needleless injector's application range has been increased.

As a technical means, it is possible to provide,

the limiting component comprises a connecting sleeve, a rotating inner sleeve and a rotating outer sleeve, wherein the connecting sleeve is fixedly assembled with the main sleeve body, one end of the rotating inner sleeve is connected with the connecting sleeve through threads, and the other end of the rotating inner sleeve is fixedly assembled with the rotating outer sleeve. When the needleless injector is used, an operator only needs to rotate the rotating outer sleeve by hand to enable the rotating inner sleeve to move back and forth along the thread direction, so that the adjusting sleeve is driven to move back and forth, the maximum volume of the liquid storage cavity can be increased or reduced, the injection dose adjusting function of the needleless injector is realized, and the needleless injector has the characteristics of simplicity in operation and capability of continuously adjusting the injection dose.

As a technical means, there is provided a method for producing,

the limiting assembly comprises a front trigger sleeve, a trigger rod and a rear trigger sleeve, and the front trigger sleeve is in synchronous transmission connection with the rear trigger sleeve through the trigger rod. When the needleless injector is used specifically, when the needleless injector performs injection action on an injected object, the skin of the injected object pushes the front trigger sleeve to move backwards, meanwhile, the rear trigger sleeve moves backwards to drive the unlocking sleeve to move backwards, so that the locking piece is unlocked, the push rod moves forwards, the liquid medicine is ejected from the liquid storage cavity, and the injection process is completed. The needleless injector of the utility model can automatically complete the injection process of the medicine from the liquid storage cavity without manual work or additional power supply of a machine.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are illustrated by way of example and not by way of limitation, and like reference numerals designate like or corresponding parts, in which:

FIG. 1 is a schematic view of the configuration of one embodiment of the needleless injector of the present invention;

FIG. 2 is a cross-sectional view E-E as in FIG. 1;

FIG. 3 is an enlarged fragmentary view of the needleless injector A shown in FIG. 2;

FIG. 4 is a schematic view of the needleless injector of FIG. 1 from another perspective;

FIG. 5 is a sectional view taken along line F-F of FIG. 4;

fig. 6 is a cross-sectional view of the rear structure of the needleless injector shown in fig. 4;

fig. 7 is an enlarged view of a portion of the needleless injector B shown in fig. 6.

Description of the reference numerals:

wherein, 1, an injection nozzle seat; 2. an injection nozzle; 3. a one-way valve; 4. an O-shaped ring; 5. a front trigger sleeve; 6. a front trigger sleeve return spring; 7. a medicine inlet is provided with a sleeve; 8. a medicine inlet; 9. a liquid storage cavity; 10. a main sleeve body; 11. a plunger rod; 12. a push rod connecting seat; 13. a power rod; 14. a connecting pin; 15. a power spring; 16. a seal member; 17. plugging and sealing; 18. rotating the outer sleeve; 19. a force-storing threaded sleeve; 20. unlocking the sleeve; 21. an adjusting sleeve; 22. steel balls; 23. connecting sleeves; 24. rotating the inner sleeve; 25. fixing the pin; 26. a baffle plate; 27. a pressure spring; 28. a retainer ring for a bore; 29. a rear trigger sleeve; 30. a piston rod; 31. an intermediate trigger sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood by those skilled in the art that the embodiments described below are part of the embodiments of the present disclosure, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a needleless injector, which is provided with a push rod capable of sliding back and forth in the injector main body, and a piston head at the front part of the push rod is matched with the injector main body in a sealing way to form a liquid storage cavity. Still be provided with spacing subassembly on the syringe main part, it can follow the position of syringe main part back-and-forth movement regulation push rod to the biggest volume in syringe stock solution chamber realizes that a syringe can possess the function of multiple injection range through adjusting. When the injection requirements of different dosages are met, the injectors with other ranges do not need to be purchased or replaced, the injection requirements of different injection dosages can be met by adopting the same injector, and the use cost is reduced.

Having described the basic principles of the present invention, various non-limiting embodiments of the invention are described in detail below. Any number of elements in the drawings are by way of example and not by way of limitation, and any nomenclature is used for distinction only and not by way of limitation.

The principles and spirit of the present invention are explained in detail below with reference to a number of representative embodiments of the invention.

Embodiment 1 of the needleless injector of the present invention:

fig. 1 is a schematic view of the structure of one embodiment of the needleless injector of the present invention. The utility model discloses the settlement is the fore-and-aft direction with the same direction along syringe main part axial, and wherein the injection nozzle direction is preceding, and the direction opposite with the injection nozzle is the back. The utility model discloses a needleless injector, including the syringe main part, its inside push rod that is equipped with along the fore-and-aft direction slidable, this push rod front portion have with the sealed cooperation of syringe main part is in order to form the piston head in stock solution chamber, syringe main part front end be equipped with the injection nozzle and the medicine inlet of stock solution chamber intercommunication. The syringe body is provided with a limiting component for limiting the backward moving distance of the push rod. When the injection device is used, firstly, the limiting component is adjusted according to the dosage of the medicine to be injected to drive the push rod to move backwards, and the corresponding volume is obtained.

Fig. 2 to 3 are sectional views E-E of fig. 1, wherein fig. 3 is a partially enlarged view of a portion a of fig. 2. The injector main body comprises an injection nozzle seat 1, an injection nozzle 2, a one-way valve 3, an O-shaped ring 4, a front trigger sleeve 5, a front trigger sleeve return spring 6, a medicine inlet mounting sleeve 7 and a medicine inlet 8.

The injection nozzle base 1 is connected with the internal thread of the main sleeve body 10 through the external thread of the injection nozzle base, the front trigger sleeve 5 is sleeved on the outer side of the injection nozzle base 1 from front to back, the front trigger sleeve 5 and the front trigger sleeve reset spring 6 are coaxially installed, one end of the front trigger sleeve reset spring 6 is in jacking fit with the front trigger sleeve 5, and the other end of the front trigger sleeve reset spring is in jacking fit with the injection nozzle base 1. The front trigger sleeve 5 realizes the front and back movement of the front trigger sleeve 5 through the compression and the extension of a front trigger sleeve return spring 6, and the injection nozzle 2 is positioned inside the front trigger sleeve 5.

The injection nozzle 2 is arranged on the outer side of the front end of the injection nozzle seat 1 and is connected with the external thread of the injection nozzle seat 1 through the internal thread of the injection nozzle 2. In order to increase the connection tightness and the sealing performance between the injection nozzle 2 and the injection nozzle seat 1, an O-shaped ring 4 is further arranged between the injection nozzle 2 and the injection nozzle seat 1. The front end of the injection nozzle seat 1 is provided with a channel for medicine injection, a one-way valve 3 is arranged between the channel and the injection nozzle 2, and the one-way valve 3 realizes the back and forth movement between the injection nozzle seat 1 and the injection nozzle 2 through a one-way valve return spring (not shown in the figure) arranged in the one-way valve 3. A gap is formed between the outer wall of the one-way valve 3 and the channel of the injection nozzle seat 1, so that the medicine is sprayed out of the needleless injector and injected into the body of the injected object.

One side of the injection nozzle seat 1 and the front trigger sleeve 5 is correspondingly provided with a hole for embedding the medicine inlet mounting sleeve 7 into the injection nozzle seat 1, the medicine inlet 8 is connected with the internal thread of the medicine inlet mounting sleeve 7 through the internal thread of the medicine inlet 8, the medicine inlet 8 is internally provided with a medicine suction channel, the channel is internally provided with a one-way valve 3, and the one-way valve 3 realizes the up-and-down movement in the medicine inlet 8 through a one-way valve reset spring (not shown in the figure) arranged in the one-way valve 3. A gap is formed between the outer wall of the one-way valve 3 and the inner wall of the medicine inlet 8 for the medicine suction. A passage for the medicine to enter and exit is formed between the medicine inlet 8 and the injection nozzle seat 1 and between the medicine inlet and the injection nozzle 2.

When in specific use, when the medicine is sucked into the needleless injector through the medicine inlet 8, the one-way valve 3 in the medicine inlet 8 moves downwards, and the medicine enters the interior of the needleless injector from a passage between the medicine inlet 8 and the injection nozzle seat 1; the check valve 3 at the front end of the injection nozzle seat 1 moves rightwards in the process and blocks a channel between the injection nozzle seat 1 and the injection nozzle 2, and the medicine is prevented from being sprayed out of the injection nozzle 2 in the process of inhalation. When the medicine is injected, the one-way valve 3 in the medicine inlet 8 moves upwards to block the medicine inlet, the one-way valve in the injection nozzle seat 1 moves forwards, and the medicine flows through a channel between the injection nozzle seat 1 and the injection nozzle 2 and is sprayed out from the injection nozzle 2 to the skin of an injected object, so that the injection process is completed. The one-way valve 3 ensures one-way flow of the drug during inhalation and injection.

FIG. 4 is a schematic view of the needleless injector of FIG. 1 from another perspective; fig. 5 is a cross section from F to F in fig. 4, and the main sleeve body 10 is connected with the external thread of the injection nozzle base 1 through the internal thread thereof. The syringe body is internally provided with a push rod which consists of a plunger rod 11, a push rod connecting seat 12 and a power rod 13. The plunger rod 11 is connected with the push rod connecting seat 12 through a connecting pin in a pin mode, the push rod connecting seat 12 is connected with the external thread of the power rod 13 through the internal thread at the rear end of the push rod connecting seat 12, and the power rod 13, the push rod connecting seat 12 and the plunger rod 11 form a synchronous linkage mechanism. The forward end of the plunger rod 11 is a piston head which sealingly engages the syringe body to form the reservoir 9. When in use, the volume of the liquid storage cavity 9 is adjusted through the forward and backward movement of the push rod. A power spring 15 is further arranged in the main sleeve body 10, the power spring 15 is sleeved on the outer side of the power rod 13, one end of the power spring 15 is fixedly connected with the push rod connecting seat 12 in a jacking assembly mode, and the other end of the power spring is fixedly connected with the power spring seat in a jacking assembly mode. When medicine is fed, the limiting assembly drives the push rod to move backwards to compress the power spring 15, after medicine feeding is completed, the limiting assembly is unlocked, the compressed power spring 15 applies elastic acting force to the push rod to drive the push rod to move forwards quickly, medicine is sprayed out of the injection nozzle, and the injection process is completed.

A sealing piece 16, a universal plug seal 17, an injection nozzle base and a buffer ring are arranged between the liquid storage cavity 9 and the push rod connecting seat 12 from front to back, and the parts are coaxially sleeved outside the plunger rod 11. When the push rod connecting seat 12 moves back and forth, the buffer ring plays a role in buffering the impact between the push rod connecting seat 12 and the base of the injection nozzle seat. The sealing piece 16 and the universal plug seal 17 are used for realizing the waterproof function of the joint part of the medicine suction cavity 9 and the plunger rod 11. In a specific use, the sealing member 16 may be made of stainless steel, and the flooding plug 17 may be a rubber sealing ring.

Fig. 6 to 7 are sectional views showing the rear structure of the needleless injector shown in fig. 4, wherein fig. 7 is a partially enlarged view at B in fig. 6.

The limiting component arranged on the syringe main body comprises a front trigger sleeve 5, a rotating outer sleeve 18, a force accumulation threaded sleeve 19, an unlocking sleeve 20, an adjusting sleeve 21, a steel ball 22, a connecting sleeve 23, a rotating inner sleeve 24, a fixed pin 25, a blocking piece 26, a return spring 27, a hole retainer ring 28 and a rear trigger sleeve 29.

The adjusting sleeve 21 is coaxially sleeved outside the push rod and is fixedly arranged in the injector main body along the front-back direction in a position-adjustable manner. When the push rod unlocking mechanism is used specifically, the locking piece can be a steel ball 22 which is movably assembled on the adjusting sleeve 21 along the radial direction of the adjusting sleeve 21, the steel ball 22 is provided with a push rod locking position and a push rod unlocking position on the movable stroke, the steel ball 22 at the push rod locking position is used for being embedded into a limiting hole on the outer wall of the push rod so as to limit the backward moving distance of the push rod, and the locking piece at the push rod unlocking position is used for being separated from the limiting hole so as to unlock the push rod.

The unlocking sleeve 20 is movably sleeved outside the adjusting sleeve 21 along the front-back direction, the unlocking sleeve is provided with a steel ball locking position and a steel ball unlocking position on the moving stroke, the unlocking sleeve 20 in the steel ball locking position is used for pressing the steel ball 22 in the push rod locking position in the radial direction of the adjusting sleeve 21, and the unlocking sleeve 20 in the steel ball unlocking position is used for avoiding the steel ball 22 in the radial direction of the adjusting sleeve 21 so that the steel ball 22 can move to the push rod unlocking position. The limiting assembly further comprises a locking elastic piece, and when the limiting assembly is used specifically, the locking elastic piece can be a pressure spring 27, the front end of the pressure spring 27 is in press fit with the unlocking sleeve 20 and used for applying an elastic acting force which moves towards the steel ball locking position to the unlocking sleeve 20 so as to press the steel ball 22 to the push rod locking position.

The connecting sleeve 23 is fixedly connected with the internal thread of the main sleeve body 10 through the external thread of the connecting sleeve, and the internal thread of the connecting sleeve 23 is in transmission connection with the external thread of the rotating inner sleeve 24. The limiting assembly further comprises a rotating outer sleeve 18, one end of the rotating outer sleeve 18 is fixedly connected with a rotating inner sleeve 24 through threads, and the other end of the rotating outer sleeve 18 is fixedly assembled with the adjusting sleeve 21 through threads. The rotating outer sleeve 18 has a rotation regulating portion for driving the rotating inner sleeve 24 to rotate and further driving the rotating inner sleeve 24, the rotating outer sleeve 18 and the adjusting sleeve 21 to move forward and backward when the rotating outer sleeve 18 is driven to rotate.

The rotating outer sleeve 18 is also provided with an inner ring platform, the front side of the inner ring platform is in stop fit with the rear end of the rotating inner sleeve 24, the adjusting sleeve 21 is positioned in the rotating outer sleeve 18, and the rear side of the inner ring platform is in stop fit with the front end of the adjusting sleeve 21. The rear end of the rotating sleeve 18 is fixedly provided with a stop 26, the stop 26 is in stop fit with the rear end of the adjusting sleeve 21, and the compression spring 27 is fixedly provided between the unlocking sleeve 20 and the stop 26, and the rear end thereof is in press fit with the stop 26.

An anti-falling limiting structure is arranged between the rotating outer sleeve 18 and the connecting sleeve 23, and comprises a hole check ring 28 arranged on the inner circumferential surface of the rotating outer sleeve 18 and a flange arranged at the rear end of the connecting sleeve 23, and the flange is used for being matched with the hole check ring 28 in a stopping manner. The orifice collar 28 and flange cooperate to prevent the rotating sleeve 18 from slipping off the syringe body over an excessive rearward travel distance.

When the needle-free injector is used specifically, the rotating outer sleeve 18 is rotated to drive the rotating inner sleeve 24 to move back and forth along the axial direction of the needle-free injector, so that the relative position of the rotating inner sleeve 24 and the connecting sleeve 23 is adjusted, the push rod is further changed to move to the push rod locking position towards the rear side, namely, the steel ball 22 is clamped between the limiting hole on the outer wall of the push rod and the hole of the adjusting sleeve 21, and the adjusting sleeve 21 presses the steel ball 22 at the push rod locking position to complete locking and limiting. When the stroke of the push rod moving towards the rear side is changed, the volume of the liquid storage cavity 10 is changed, and meanwhile, the volume of the inhaled medicine is changed, so that the adjustment of the dosage is realized. In specific implementation, the range of the needleless injector of the utility model is 0.2-2.0 mL.

The stop assembly further comprises a front trigger sleeve 5 which is used for being pushed by the skin of the injection subject to move backwards during the injection of the needleless injector. The front trigger sleeve 5 is in synchronous transmission connection with the unlocking sleeve 20, so that the unlocking sleeve 20 is driven to synchronously move backwards when the front trigger sleeve moves backwards to realize unlocking. The stopper assembly also includes a rear trigger sleeve 29 which is slidably mounted on the syringe body in the forward-rearward direction. The rear trigger sleeve 29 is fixedly assembled with the unlocking sleeve 20. The front trigger sleeve 5 is connected with the rear trigger sleeve 29 through a trigger rod which is arranged and extends along the front-rear direction, and the front trigger sleeve 5 is in synchronous transmission connection with the unlocking sleeve 20 through the trigger rod and the rear trigger sleeve 29.

During injection, the front trigger sleeve 5 is pressed by the skin of an injection object to move backwards, and meanwhile, the unlocking sleeve 20 is driven to move backwards so as to avoid the steel balls 22 in the radial direction of the adjusting sleeve 21, so that the steel balls can move towards the unlocking position of the push rod, unlocking is realized, and the medicine is sprayed out from the injection nozzle 2 to complete injection.

In one embodiment, the rear trigger sleeve 29 is sleeved with the power storage threaded sleeve 19, the power storage threaded sleeve 19 is fixedly provided with the fixing pin 25, and the rotating outer sleeve 18 is provided with a long hole through which the fixing pin 25 passes, wherein the long hole extends along the front-rear direction, so that the fixing pin 25 drives the power storage threaded sleeve 19 to slide back and forth. The lower end of the fixed pin is fixedly assembled with the unlocking sleeve 20 so as to realize the fixed assembly of the rear trigger sleeve and the unlocking sleeve 20. The front trigger sleeve 5 is synchronously connected with the unlocking sleeve 20 through a trigger rod, a rear trigger sleeve 29 and a power storage threaded sleeve 19 in a transmission way.

In specific use, the inner rotating sleeve 24 moves backwards for a certain distance to complete dose adjustment, at this time, the inner rotating sleeve 24 drives the outer rotating sleeve 18, the force accumulating threaded sleeve 19, the rear trigger sleeve 29 and the front trigger sleeve 5 to synchronously move backwards for a corresponding distance, and then the front trigger sleeve moves backwards relative to the injection nozzle 2, so that the injector cannot complete the trigger process. At this time, the rear trigger sleeve 29 needs to be moved forward on the power storage threaded sleeve 19 by a corresponding distance relative to the power storage threaded sleeve 19 to drive the front trigger sleeve 5 to move forward to the position before dose adjustment, so that the front trigger sleeve 5 after dose adjustment can still contact with the skin of the injected object to complete power storage triggering.

When the needleless injector of the utility model is used, the power mechanism which drives the push rod to move backwards can be applied by manpower or by a machine. For the convenience of operation, the power rod 13 connected to the outside is provided as a hollow cavity, and the rear end thereof is provided with a hole through which only the piston rod 30 passes. A piston rod 30 can be arranged in the hollow cavity, the front end of the piston rod 30 is a sphere, the sphere of the piston rod 30 is located inside the power rod 13 and is in sliding connection with the inner wall of the power rod 13, and the rod part of the piston rod 30 extends to the outside of the power rod 13 and is detachably connected with the power mechanism. The diameter of the sphere of the piston rod 30 is larger than the diameter of the rod body. In particular, the piston rod 30 may be threadedly coupled to the power mechanism. When the push rod locking mechanism is used specifically, the piston rod 30 is inserted into the power mechanism to form a fastener, and moves backwards under the action of the power mechanism, and the sphere of the piston rod 30 drags the power rod 13 to move backwards until the push rod is moved to the push rod locking position.

In one embodiment, two middle triggering sleeves 31 can be sleeved outside the main sleeve body 10, and the middle triggering sleeves 31 are fixedly connected with the front triggering sleeve 5 and the rear triggering sleeve 29 respectively through triggering rods. The middle trigger sleeve is used for guiding the action of the front trigger sleeve 5 to the rear trigger sleeve 29, and enables the trigger section 5 and the trigger sleeve 29 to be linked. The number of the intermediate trigger sleeves can be one or more.

The utility model discloses a needleless injector is when the in-service use, including following process:

before the use, the end of the rotating inner sleeve is flush with the end of the rotating inner sleeve connecting sleeve. The relative positions of the rotating inner sleeve and the rotating inner sleeve connecting sleeve are firstly adjusted according to the required injection dose. One hand holds the front end of the needleless injector, the other hand twists the rotating outer sleeve, and thread glue is added at the threaded connection position between the rotating outer sleeve and the rotating outer sleeve, so that the rotating inner sleeve and the rotating outer sleeve cannot rotate, the rotating outer sleeve can be twisted to drive the rotating inner sleeve to move backwards relative to the rotating inner sleeve connecting sleeve along the axial direction of the power rod, and one thread corresponds to one dosage value when one thread is twisted backwards. And simultaneously, the rear trigger sleeve moves forwards by a corresponding distance relative to the power-storage threaded sleeve. The medicine bottle is connected into the medicine inlet, the power mechanism is connected with the piston rod, the power rod moves towards the rear side under the driving of the external power mechanism, the power spring is compressed, and the steel ball is clamped in the corresponding holes of the unlocking sleeve and the adjusting sleeve to finish the force storage.

When in injection, the injection nozzle is pressed to the skin of an inoculated object, the front trigger sleeve moves backwards, the front trigger sleeve drives the trigger sleeve to move backwards, the unlocking sleeve moves backwards, namely, the unlocking sleeve avoids steel balls in the radial direction of the adjusting sleeve, the steel balls move towards the unlocking position of the push rod to release the steel balls, and the power rod applies pressure to the medicine in the liquid storage cavity under the action of the power spring, so that the medicine is sprayed into the body from the inside of the injection nozzle at high speed, and the injection is completed.

When different medicines need to be injected, the injection nozzle and the liquid storage cavity need to be cleaned. The medicine is replaced by normal saline to clean the inside of the injection nozzle and the liquid storage cavity, and then the normal saline is sprayed out to finish cleaning. After the different medicines are replaced, the medicines are inhaled and injected as described above.

Embodiment 2 of the needleless injector of the present invention:

the difference from example 1 is mainly that: the locking member in example 1 is a steel ball.

The locking piece in this embodiment is the plug pin, and when specifically using, peg graft between spacing hole on the push rod outer wall and the hole on the adjusting collar with the plug pin, realizes the locking of push rod. And the plug pin is pulled out from the hole, so that the push rod is unlocked.

The utility model provides a needleless injector's embodiment 3:

the difference from example 1 is mainly that: the number of the intermediate trigger sleeves in example 1 was two.

In the embodiment, the middle trigger sleeve is not arranged, so that the front trigger sleeve is connected with the rear trigger sleeve through the trigger rod, and the stroke is synchronous with the transmission mechanism.

In light of the foregoing description of the present specification, those skilled in the art will also understand that terms used herein, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "lateral," "clockwise," or "counterclockwise," etc., indicate that the terms used herein are based on the orientations and positional relationships illustrated in the drawings of the present specification, and are intended merely for the purpose of facilitating the description and simplifying the description, and do not explicitly or implicitly indicate that the device or element being referred to must have the particular orientation, be constructed and operated in the particular orientation, and therefore the terms used in the orientation or positional relationship should not be understood or interpreted as limiting the scope of the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and, accordingly, to cover module compositions, equivalents, or alternatives falling within the scope of the claims.

Claims

1. A needleless injector comprising:

it is characterized in that the preparation method is characterized in that,

the adjusting sleeve is coaxially sleeved outside the push rod and is fixedly arranged in the injector main body along the front-back direction in a position-adjustable manner; and

2. The needle free injector of claim 1, wherein the lock is a steel ball;

the unlocking sleeve is movably sleeved outside the adjusting sleeve along the front-back direction, the unlocking sleeve is provided with a steel ball locking position and a steel ball unlocking position on the moving stroke, the unlocking sleeve at the steel ball locking position is used for jacking the steel balls at the push rod locking position in the radial direction of the adjusting sleeve, and the unlocking sleeve at the steel ball unlocking position is used for avoiding the steel balls in the radial direction of the adjusting sleeve so that the steel balls can move to the push rod unlocking position; and

3. The needle free injector of claim 2, wherein the limiting assembly comprises a front trigger sleeve for being pushed by the skin of the injected subject to trigger backward movement when the needle free injector injects, and the front trigger sleeve is in synchronous transmission connection with the unlocking sleeve so that the unlocking sleeve is driven to synchronously move backward by the front trigger sleeve when the front trigger sleeve moves backward to realize unlocking.

4. The needle free injector of claim 3, wherein the injector body is slidably assembled with a rear trigger sleeve along a front-rear direction, the rear trigger sleeve is fixedly assembled with the unlocking sleeve, and a trigger rod arranged on the front trigger sleeve and extending along the front-rear direction is fixedly connected with the rear trigger sleeve, so that the front trigger sleeve is synchronously connected with the unlocking sleeve through the trigger rod and the rear trigger sleeve in a transmission manner.

5. The needle free injector of claim 4, wherein the rear trigger sleeve is provided with a power storage threaded sleeve, the power storage threaded sleeve is fixedly provided with a fixing pin, and the injector body is provided with a long hole for the fixing pin to pass through, and the long hole extends along the front-back direction to allow the fixing pin to slide back and forth.

6. The needle free injector of claim 4, wherein the injector body is fixedly sleeved with an intermediate trigger sleeve, the intermediate trigger sleeve is positioned between the front trigger sleeve and the rear trigger sleeve, and the trigger rod and the intermediate trigger sleeve are movably assembled in a guiding manner along the front-rear direction.

7. The needle free injector of any of claims 2-6, wherein the injector body comprises a main housing, the stop assembly comprises a nipple, a rotating inner housing, a rotating outer housing;

the connecting sleeve is fixedly assembled with the main sleeve body;

one end of the rotating outer sleeve is fixedly assembled with the rotating inner sleeve, the other end of the rotating outer sleeve is fixedly assembled with the adjusting sleeve, and the rotating outer sleeve is provided with a rotating adjusting part so as to drive the rotating inner sleeve to rotate when the rotating outer sleeve is driven to rotate, so that the rotating inner sleeve, the rotating outer sleeve and the adjusting sleeve are driven to move back and forth.

8. The needle free injector of claim 7, wherein the rotating outer sleeve has an inner land with a front side that is in stop engagement with a rear end of the rotating inner sleeve, the adjustment sleeve is located in the rotating outer sleeve, and a rear side of the inner land is in stop engagement with a front end of the adjustment sleeve.

9. The needle free injector of claim 7, wherein the rear end of the rotating outer sleeve is fixedly assembled with a stop piece which is in stop fit with the rear end of the adjusting sleeve, and the locking elastic member is a pressure spring with a front end in press fit with the unlocking sleeve and a rear end in press fit with the stop piece.

10. The needle free injector of claim 7, wherein an anti-slip structure is provided between the rotating outer sleeve and the connecting sleeve, the anti-slip structure comprises a hole retainer ring provided on an inner circumferential surface of the rotating outer sleeve and a flange provided at a rear end of the connecting sleeve for retaining engagement with the hole retainer ring.