CN109621096A

CN109621096A - A kind of medical needleless injector

Info

Publication number: CN109621096A
Application number: CN201910089732.5A
Authority: CN
Inventors: 王才丰
Original assignee: Individual
Current assignee: Hu Xiaohua
Priority date: 2016-11-05
Filing date: 2016-11-05
Publication date: 2019-04-16
Anticipated expiration: 2036-11-05
Also published as: CN109568726A; CN106334240B; CN109568727A; CN109568730A; CN109621096B; CN109568729A; CN109568728A; CN106334240A

Abstract

The invention discloses a kind of medical needleless injectors, are pulled component, trigger component and terminal injecting assembly by gun body, striker assembly, circulation and are constituted；Gun body is made of gun rack and gun barrel, for providing support and running space for other component；Striker assembly is made of hammer body, elastic string and push type alarm, provides impact force by axial movement of the hammer body in gun barrel for terminal injecting assembly；Circulation pulls component and is located in driving chamber, for driving striker assembly to reach the state of loading, and controls hammer body excitation；Trigger component is for driving circulation to pull assembly operating；Terminal injecting assembly is made of medicine-storing tube, piston and push rod, is provided power by striker assembly and is realized Needleless injection.This medical needleless injector is scientific and reasonable for structure, and convenient for holding, it is convenient to operate, and can be rapidly performed by repeatedly continuous injection and realize that strong dose object is injected, and has expanded medical needleless injector in the application range in clinical injection field.

Description

A kind of medical needleless injector

The present invention is the dividing application No. is 201610967779.3 application for a patent for invention submitted on November 05th, 2016 Case application.

Technical field

The present invention relates to a kind of medical instrument more particularly to one kind can continuous several times injection and realize drug bolus infusion Medical needleless injector.

Background technique

Needleless injection is to make liquid medicine in such a way that ultra-fine, high speed, straight line spray high-pressure jet by needleless injector It is directly entered body tissue, is punctured without syringe needle and reaches a kind of new technique of drug injection purpose.Needleless injection and previous biography System injection technique is compared, and is punctured body without syringe needle, is reduced the pain and fear of drug injection, reduce bacterium infection Risk, avoid the generation that syringe needle scratched and fractureed etc. accidents, improve the convenience and safety of drug injection operation；Together When, when due to using Needleless injection, drug is that disperse shape enters subcutaneously, is uniformly dispersed, it is easy quickly to be absorbed by body tissue, and It is not easy to plug small lymphatic vessel, long-time service does not subcutaneously play scleroma, hence improves drug injection effect, improves drug and rises Imitate speed.Therefore needleless injection techniques are " revolution of medical injection technology ", are had in future clinical medical treatment extensive Application prospect.

Needleless injector is the core instrument for implementing Needleless injection, and current needleless injector is although compact-sized, volume It is small and exquisite, there is certain advantage in operation convenience, but undeniably, there are certain drawbacks in clinical application.Than Such as:

(1) when needleless injector works, high-pressure jet can just be formed by needing to provide sufficiently large pressure for medical fluid, so that often It requires to carry out needleless injector necessary pre- preceding operation before secondary injection, reaches " energy accumulating state ", some needleless note Operation before emitter needs hand-held progress pre-, cumbersome, time-consuming and laborious, also some needleless injectors carry out pre- by specific purpose tool Preceding operation, use is inflexible, convenient, can not independently use.

(2) based on existing needleless injector reach " energy accumulating state " it is pre- before operation it is all not convenient enough, can not efficiently into Line Continuity injection, and the dosage of needleless injector single injection is lesser, so that injection dosage becomes existing Needleless injection The short slab of device, can typically be only used to the clinical injection of the small dose drugs such as insulin, and be not used to the slightly larger antibiotic of dosage, The clinical injection of the drugs such as interferon, existing needleless injector are limited by above-mentioned key factor and can not be wide in clinical injection field General application.

(3) existing needleless injector structure is compact, but component is more, needs reasonably to design the technique for adding precision Realize mechanical performance, so that its manufacturing cost is high, manufacture difficulty is big, usually imported product, and acquisition cost is high, consuming public It is difficult to bear, this is also to limit the commonly used key factor of needleless injector.

Summary of the invention

The purpose of the present invention is to provide a kind of scientific structures, and it is convenient to operate, and fast can continuously inject and realize large dosage The medical needleless injector of drug injection, it is intended to solve that the operation of existing needleless injector is not convenient enough, is limited and makes by injection dosage With the deficiencies of range is small, cost of manufacture is high.

To realize the above-mentioned technical purpose, the present invention adopts the following technical scheme:

A kind of medical needleless injector comprising:

Gun body is made of the gun rack and gun barrel being fixedly connected；Cylindrical bore is equipped in gun barrel, the two sides of bore are each The front end of the side chamber communicated therewith equipped with one, gun barrel is fixed with thread head through neck tube, and neck tube side wall is provided with observation window with a scale, Neck tube inner cavity, thread head inner cavity and bore three are coaxial, and neck tube internal diameter is small compared with bore；The tail end of gun rack is equipped with and extends downwardly Handle, the interior downside being equipped with positioned at bore of gun rack and the driving chamber communicated with bore；

Striker assembly is made of hammer body, elastic string and push type alarm；Hammer body is located in bore and only can axially move Dynamic, the downside of hammer body is equipped with towing mechanism；Elastic string is equipped with two, and it is intracavitary to be located at two sides, and elastic string one end and hammer body connect It connects, the other end is then connect with gun body；Push type alarm includes the trigger switch of control its work, and trigger switch is placed in rifle On rear side of thorax；When trigger switch is supported in the rear end of hammer body, push type alarm issues warning, and two elastic strings are in tensional state, Striker assembly is in state of loading at this time；It will quickly move forward after hammer body excitation and impact force is generated to front side member；

Circulation pulls component comprising a transmission belt, the driven wheel and driving wheel that transmission belt is arranged by front and back support and position In in driving chamber, and the upside of transmission belt is parallel with hammer body axis；Driving wheel and reversed back-stop mechanism cooperation and only can be positive Rotation, transmit the upside of transmission belt can only from the front to the back；It is installed in transmission belt there are two dragging fin block separately, works as dragging When fin block moves from the front to the back with transmission belt, which will cooperate with towing mechanism and hammer body is driven to move backward, when this When dragging fin block is moved to right above driving wheel, striker assembly reaches the state of loading, when the dragging fin block is downward at driving wheel When mobile, pulling fin block will be detached from towing mechanism and excite hammer body；

Trigger component comprising trigger and one-way driving mechanism, trigger are located at the front side of handle and along main shaft swings, Trigger drives lower end that can reset forward automatically by resetting-mechanism；One-way driving mechanism is set between trigger and driving wheel, trigger Driving wheel will be driven to rotate forward by one-way driving mechanism when swinging backward；

Terminal injecting assembly comprising be slidingly sealed the medicine-storing tube and piston of cooperation, medicine-storing tube front end is equipped with injection orifice, storage The rear end of cylindrantherae is equipped with the thread bush cooperated with thread head, and push rod is connected on rear side of piston, and push rod is equipped with station location marker；Work as spiral shell After line set is combined with thread head, putting back-end passes through thread head and neck tube and enters in bore and can be hit by hammer body, passes through rotation Turn thread bush and the length that push rod protrudes into bore is adjusted, can determine whether that push rod protrudes into station location marker by the scale on observation window Length value in bore, i.e., clear injection dosage.

The working principle of this medical needleless injector are as follows:

The handle of hand-held gun body, using finger it is reciprocal pull trigger, driving wheel is in one-way driving mechanism and reversed check It is intermittent under the double action of mechanism to rotate forward, when pull fin block with transmission belt above driven wheel with driving wheel by preceding When moving backward, pulling fin block will gradually be supported with towing mechanism, and hammer body is driven to overcome the pulling force of two elastic strings and move backward, When the dragging fin block is moved to right above driving wheel, hammer body is located at bore rear portion, and push type alarm will be issued and be warned, operation Person can specify striker assembly and have reached the state of loading；It combines thread bush with thread head, makes the terminal injection group for being stored with medical fluid Part is fixed on the front end of gun body, and push rod tail end is watched by the station location marker on the scale and push rod on observation window and protrudes into bore Interior length value, and the length that push rod protrudes into bore is adjusted by rotation thread bush, that is, realize the adjusting of injection dosage, Thus the button-up operations before injection has been completed；Surface sterilization processing is carried out to human injection position, by the note of medicine-storing tube Perforation end presses against injection site, continues to pull trigger, and the dragging fin block with towing mechanism cooperation will be along driving wheel to the back lower place It moves and is detached from towing mechanism, it, will be by two elastic strings after the hammer body in the state of loading loses the resistance for pulling the offer of fin block Pulling force driving and fast forward movement, hammer body will hit push rod tail end and move forward piston moment, that is, complete primary micro- Amount injection；By the injection orifice of medicine-storing tube support it is continuous press against injection site, continue to pull trigger, another dragging fin block will with pull Mechanism cooperation makes striker assembly repeat aforementioned activities, and thus one, medical needleless injector can be made by continuously pulling trigger It is rapidly performed by multiple micro-injection, until putting back-end is ejected bore completely, hammer body can not continue to hit push rod tail at this time End, that is, complete the drug injection of preset dose.

Furthermore, in this medical needleless injector, it is provided with one on the upper side wall of the bore and axially extending leads To slot, and the upside of hammer body is equipped with the guiding rib being in sliding fit with the sliding chute, and cooperates through guide groove and guiding rib, makes hammer body in bore It is inside only axially movable, without relatively rotating.

Furthermore, in this medical needleless injector, the gun rack is made of composite material, the rifle Pipe, neck tube and thread head are integrally formed and are made of metal material, and the downside of gun barrel handles through aperture and makes bore and downside Driving chamber connection.

Furthermore, in this medical needleless injector, the hammer body front end and push rod tail end are respectively provided with a shock Portion, the shock portion are made of high-intensitive, high rigidity material.

Furthermore, in this medical needleless injector, the push type alarm uses split-type design, i.e. institute The push type alarm stated is made of the trigger switch and alarm body being connected through conducting wire, after trigger switch is fixed on bore Side, and alarm body is placed in inside the handle of gun body.

Furthermore, in this medical needleless injector, the reversed back-stop mechanism is made of ratchet and pawl；Spine Wheel is located at the side of driving wheel, and the two is coaxial and relatively fixed, and ratchet and driving wheel are using integrated design；Pawl then by with gun body Relatively-stationary shaft provides support；Ratchet can only rotate forward under the cooperation of pawl, and make and the relatively-stationary master of ratchet Driving wheel also only can positive direction rotation.

Furthermore, it is relatively-stationary with gun rack that one is equipped in this medical needleless injector, in the driving chamber Leading truck, the leading truck is between driving wheel and driven wheel, and upper surface is parallel with transmission belt upper inside walls respectively, is close to.

Furthermore, the one-way driving mechanism is made of a ratchet mechanism and a set of planetary gear speed reducing mechanism；It is described Ratchet mechanism be arranged between main shaft and trigger, when swinging backward trigger only driving spindle rotate；The planetary reduction gear Mechanism is made of internal gear, three planetary gears, central gear and planet carrier, and the side of driving wheel, driving wheel is arranged in internal gear It can be relatively rotated by main shaft support and the two, central gear is fixed on main shaft, and planet carrier is relatively fixed with gun body and makes three The gear shaft position of planetary gear is constant；The main shaft, driving wheel, internal gear, central gear are coaxial.

Furthermore, in this medical needleless injector, the transmission belt uses synchromesh gear belt, driving wheel and quilt Driving wheel uses corresponding gear；

Or the transmission belt uses chain, driving wheel uses corresponding sprocket wheel with follower；

Or the transmission belt uses V-belt, driving wheel uses corresponding groove profile belt wheel with follower.

Furthermore, in this medical needleless injector, the dragging fin block is by integrally formed fin seat and fin It constitutes, the two is vertical, and fin is located at the side of fin seat, and fin seat is fixed in transmission belt and can provide support for fin.

Furthermore, in this medical needleless injector, the driving wheel is big compared with driven wheel diameter, makes transmission belt Track tends to triangle, pre-small post-large.

Compared with prior art, the present invention it has the following beneficial effects: which employs the designs of the structure of reasonable science, no Only convenient for holding, it is relatively beneficial to hand and has an effect, so that medical needleless injector reaches " energy accumulating state " the i.e. work of " state of loading " Work is especially easily laborsaving, not only carries out without extra means, completes with can be operated with one hand, flexibly and easily；Due to medical The operation that needleless injector reaches " energy accumulating state " is very convenient, in addition for the circulation to realize " state of loading " offer power It pulls component and is recycled work, so that this medical needleless injector can be rapidly performed by repeatedly continuous injection, it can fast and easy Realize preset large dosage of drug injection by the way that multiple micro-injection is cumulative, overcome previous needleless injector and be simply possible to use in The deficiency of drug dose injection has expanded needleless injector in the application range in clinical injection field.Its is structurally reasonable, implements It is easy, cost of manufacture is cheap, is beneficial to the promotion and popularization of medical needleless injector.

Detailed description of the invention

Fig. 1 is one of this medical needleless injector appearance diagram.

Fig. 2 is the two of this medical needleless injector appearance diagram.

Fig. 3 is this medical needleless injector schematic diagram of internal structure.

Fig. 4 is the decomposition diagram of medical needleless injector.

Fig. 5 is the structural schematic diagram of gun rack.

Fig. 6 is the structural schematic diagram of gun barrel.

Fig. 7 is the structural schematic diagram of hammer body and elastic string.

Fig. 8 is one of hammer body and the cooperation schematic diagram of gun barrel.

Fig. 9 is the two of the cooperation schematic diagram of hammer body and gun barrel.

Figure 10 is that circulation pulls one of component and the structural schematic diagram of trigger component.

Figure 11 is the second structural representation that circulation pulls component and trigger component.

Figure 12 is one of the cooperation schematic diagram that hammer body and circulation pull component.

Figure 13 is the two of the cooperation schematic diagram of hammer body and circulation dragging component.

Figure 14 is the combination diagram of terminal injecting assembly and gun body.

Figure 15 is terminal injecting assembly when drug is specified maximum reserves and the mated condition figure of hammer body.

Figure 16 is drug injection in terminal injecting assembly when finishing and the mated condition figure of hammer body.

Figure 17 is the mated condition figure that injection dosage is set as terminal injecting assembly and hammer body when maximum rating.

Figure 18 is that this medical needleless injector adds the structural schematic diagram after the second trigger switch.

Figure 19 is the structural schematic diagram after hammer body is further improved.

Figure 20 is that trigger component and driving wheel cooperate schematic diagram.

Figure 21 is one of trigger component and driving wheel decomposition diagram.

Figure 22 is the two of trigger component and driving wheel decomposition diagram.

Figure 23 is the structural schematic diagram that trigger and main shaft are driven through ratchet mechanism.

Figure 24 is the structural schematic diagram after terminal injecting assembly is further improved.

In figure, 1, medicine-storing tube, 2, thread bush, 3, station location marker, 4, observation window, 5, gun barrel, 6, handle, 7, trigger, 8, rifle Frame, 9, neck tube, 10, scale, 11, thread head, 12, injection orifice, 13, driving chamber, 14, bore, 15, side chamber, 16, hammer body, 17, bullet Property rope, 18, pull fin block, 19, driving wheel, 20, trigger switch, 21, one-way driving mechanism, 22, push type alarm, 23, main Axis, 24, transmission belt, 25, driven wheel, 26, axle bed, 27, push rod, 28, resetting-mechanism, 29, guiding rib, 30, towing mechanism, 31, Guide groove, 32, leading truck, 33, pawl, 34, fin, 35, fin seat, 36, ratchet, 37, piston, 38, guiding bolt, 39, shock portion, 40, the second trigger switch, 41, spring, 42, key seat, 43, ejector pin, 44, central gear, 45, planet carrier, 46, planetary gear, 47, interior Ring gear, 48, ratchet mechanism, 49, ratchet, 50, pawl, 51, dose scale.

Specific embodiment

Referring to shown in Fig. 1-4, a kind of medical needleless injector disclosed in this invention, mainly by gun body, striker assembly, Circulation pulls component, trigger component and the most of composition of terminal injecting assembly five.

Wherein, referring to shown in Fig. 1-6 and 9, the gun body is made of the gun rack 8 being fixedly connected with gun barrel 5；In gun barrel 5 Equipped with cylindrical bore 14, the two sides of bore 14 are respectively provided with a side chamber 15 communicated therewith, and the front end of gun barrel 5 is solid through neck tube 9 Surely there is thread head 11,9 side wall of neck tube is provided with a scale 10 observation window 4,9 inner cavity of neck tube, 11 inner cavity of thread head and bore 14 3 Person is coaxial, and 9 internal diameter of neck tube is small compared with bore 14；The tail end of gun rack 8 is equipped with the handle 6 extended downwardly, is equipped in gun rack 8 and is located at rifle The downside of thorax 14 and the driving chamber 13 communicated with bore 14；Skeleton of the gun body as this medical needleless injector, is used for as it His component provides work running space and necessary support.

Wherein, referring to Fig. 3, shown in 4,7,8,9, the striker assembly by hammer body 16, elastic string 17 and push type alarm Device 22 is constituted；Hammer body 16 is located in bore 14 and is only axially movable, since 9 internal diameter of neck tube is small compared with bore 14,16 front end of hammer body It will not enter in neck tube 9, the downside of hammer body 16 is equipped with towing mechanism 30；Elastic string 17 is equipped with two, is located at two side chambers 15 Interior, 17 one end of elastic string is connect with hammer body 16, and the other end is then connect with gun body；Push type alarm 22 controls its work including one Trigger switch 20, trigger switch 20 is placed in the rear side of bore 14；When trigger switch 20 is supported in the rear end of hammer body 16, push type Alarm 22 will be issued and be warned, and two elastic strings 17 are in tensional state, and striker assembly is in state of loading at this time；Hammer body 16 excites After will quickly move forward and to front side member generate impact force；Striker assembly realizes medical needleless injector for absorbing external force " energy accumulating state ", required pressure when to provide injection for terminal injecting assembly.When due to the work of medical needleless injector, Hammer body 16, which should be, generates biggish impact force to front side member, therefore hammer body 16 should be made of the biggish material of density, to improve Its kinetic energy after exciting；Two elastic strings 17 are used to provide the power of Forward for hammer body 16, therefore it is answered with good tensile property It is made of high resiliency top-quality rubber.Push type alarm 22 is existing apparatus, is typically provided with a trigger switch 20, works as triggering When switch 20 is supported by external pressure, push type alarm 22 will be triggered, and the warning form of push type alarm 22 can be sound Sound warning or light warning or acousto-optic warning, are intended to that the clear striker assembly of user is made to have reached the state of loading at this time, subsequent Operation can be injected, and to operate with caution, injection be avoided to make mistakes；Two elastic strings 17 are located in two side chambers 15, it is intended to make rifle Thorax 14 is made for the movable exclusive space of hammer body 16, and two elastic strings 17 are stretched and also mainly completed in respective space, thus It can avoid bringing obstruction when elastic string 17 moves forward to hammer body 16.

Wherein, referring to Fig. 3,4 and 10-13 shown in, it includes a transmission belt 24 that the circulation, which pulls component, transmission belt 24 by The driven wheel 25 and driving wheel 19 of front and back setting support and are located in driving chamber 13, and the upside of transmission belt 24 and 16 axis of hammer body In parallel；Driving wheel 19 cooperates with a reversed back-stop mechanism and can only rotate forward, and makes the upside of transmission belt 24 only can be from the front to the back It transmits and the transmission of irreversible row；It is installed in transmission belt 24 there are two dragging fin block 18 separately, when dragging fin block 18 is with transmission When band 24 moves from the front to the back, which will cooperate with towing mechanism 30 and hammer body 16 is driven to move backward, when this is dragged When dragging fin block 18 and being moved to 19 surface of driving wheel, striker assembly reaches the state of loading, when the dragging fin block 18 is in driving wheel 19 When place moves down, pulling fin block 18 will be detached from towing mechanism 30 and excite hammer body 16.It can be seen that circulation pulls component By the circle transmission of 24 single direction of transmission belt, the cooperation for pulling fin block 18 and towing mechanism 30 by two can be circuited sequentially, And drag hammer body 16 and be moved rearwardly into the state of loading, then make to pull fin block 18 again and towing mechanism 30 is detached from, swashs hammer body 16 One circle of hair, i.e. transmission belt 24 operation, the completion of striker assembly successively is loaded twice to be acted with excitation.On the one hand circulation pulls component The power needed for state that loads is realized for providing for striker assembly, and on the other hand the control then as striker assembly excitation is opened It closes.It is pulled in component operation in circulation, the power that transmission belt 24 is run is provided by driving wheel 19, and 24 upside of transmission belt is transmitted backward When driving wheel 19 rotation be reversely defined as forward direction, when driving wheel 19 is driven by external force and rotated forward, reversed back-stop mechanism is not Driving wheel 19 can be prevented to rotate；And after the external force for driving driving wheel 19 to rotate forward disappears, two elastic strings 17 are as in stretching State, then the pulling force of elastic string 17 will indirectly act on the trend for making driving wheel 19 generate reversion to driving wheel 19, at this time reversely Back-stop mechanism will prevent driving wheel 19 from reversely rotating, and circulation is made to pull component locking and maintain standing state.

Wherein, referring to Fig. 3,4 and 10-13 shown in, the trigger component includes trigger 7 and one-way driving mechanism 21, is pulled Machine 7, which is located at the front side of handle 6 and can be fixed on intracorporal two axle bed 26 of rifle along 23 swing of main shaft, the both ends of main shaft 23, to be limited Fixed, trigger 7 drives lower end that can reset forward automatically by resetting-mechanism 28；One-way driving mechanism 21 is set to trigger 7 and driving wheel Between 19, driving wheel 19 will be driven to rotate forward by one-way driving mechanism 21 when trigger 7 is swung backward, conversely, working as trigger 7 certainly When moving reset and swinging forward, driving wheel 19 will not be indirectly driven.It can be seen that trigger component passes through the past physical pendulum of trigger 7 It is dynamic, through one-way driving mechanism 21 drive driving wheel 19 carry out it is intermittent rotate forward, and then realize 24 single direction of transmission belt Circle transmission.Trigger 7 above-mentioned drives lower end that can reset forward automatically by resetting-mechanism 28, and the resetting-mechanism 28 is more often See, is the prior art, for example use V-arrangement elastic slice, as shown in Figure 10,12, one end of V-arrangement elastic slice is fixedly connected with trigger 7, and another One end is then fixed with gun body, and the technology mesh that 7 lower end of trigger can reset forward automatically can be realized by the elasticity of itself for V-arrangement elastic slice 's.

Wherein, referring to shown in Fig. 1,3,14, the terminal injecting assembly includes being slidingly sealed the medicine-storing tube 1 of cooperation and living Plug 37,1 front end of medicine-storing tube are equipped with injection orifice 12, and the rear end of medicine-storing tube 1 is equipped with the thread bush 2 cooperated with thread head 11, medicine-storing tube 1 The cavity of 37 front side of inner piston is connected with push rod 27, push rod 27 is equipped with station location marker 3 for prestoring medical fluid on rear side of piston 37； After thread bush 2 is combined with thread head 11,27 rear end of push rod passes through thread head 11 and neck tube 9 and enters in bore 14 and can be hammered into shape 16 front end impact of body is adjusted the length that push rod 27 protrudes into bore 14 by rotating thread bush 2, passes through observation window 4 and position Mark 3 can determine whether the length value that push rod 27 protrudes into bore 14, i.e., clear injection dosage；When hammer body 16 is by one or many 27 rear end of push rod is hit, and after so that 27 rear end of push rod is exited bore 14 completely, that is, complete the drug injection of preset dose.

Referring to described in Fig. 1,3,4,12,13,14, the working principle of above-mentioned medical needleless injector are as follows: hand-held gun body is held 6, using finger it is reciprocal pull trigger 7, double action of the driving wheel 19 in one-way driving mechanism 21 and reversed back-stop mechanism It is lower and it is intermittent rotate forward, when pulling fin block 18 with transmission belt 24 in the top of driven wheel 25 and driving wheel 19 and by forward direction After when moving, pulling fin block 18 gradually will support cooperation with towing mechanism 30, and hammer body 16 is driven to overcome the pulling force of two elastic strings 17 And move backward, when the dragging fin block 18 is moved to 19 surface of driving wheel, hammer body 16 has been located in 14 rear portion of bore, push type Alarm 22 will be issued and be warned, and operator can specify striker assembly and have reached the state of loading；By thread bush 2 and 11 groups of thread head It closes, combines the terminal injecting assembly for being pre-stored with medical fluid with gun body, pass through the position on the scale 10 and push rod 27 on observation window 4 Mark 3 is set to judge that 27 tail end of push rod protrudes into the length in bore 14, and rifle is protruded into adjust push rod 27 by rotation thread bush 2 Length value in thorax 14 realizes the adjusting of injection dosage, the button-up operations before injection has thus been completed；To human body Injection site carries out surface sterilization processing, and 12 end of injection orifice of medicine-storing tube 1 is pressed against injection site, continues to pull trigger 7, with The dragging fin block 18 that towing mechanism 30 cooperates will be moved to the back lower place along driving wheel 19 and will be detached from towing mechanism 30, in loading After the hammer body 16 of state loses the resistance for pulling the offer of fin block 18, it will be driven by the pulling force of two elastic strings 17 and quickly be transported forward Dynamic, 16 front end of hammer body will hit the rear end of push rod 27 and move forward 37 moment of piston, that is, complete a micro-injection；It will storage The injection orifice 12 of cylindrantherae 1, which supports to continue, presses against injection site, continues to pull trigger 7, another dragging fin block 18 will be with towing mechanism 30 cooperations make striker assembly repeat aforementioned activities, and thus one, medical needleless injector can be made by continuously pulling trigger 7 It is rapidly performed by multiple micro-injection, until 27 rear end of push rod is ejected bore 14 completely, hammer body 16 can not continue to hit at this time 27 tail end of push rod, that is, complete the drug injection of preset dose.

It is compared with previous needleless injector, structure design of the present invention is more scientific and reasonable, it is not only convenient for holding, It is relatively beneficial to hand to have an effect, so that the work that medical needleless injector reaches " energy accumulating state " i.e. " state of loading " especially easily saves Power is not only carried out without extra means, is completed with can be operated with one hand, flexibly and easily；Due to for striker assembly realize " on The circulation that thorax state " provides power pulls component and is recycled work, while its function of also having both control striker assembly excitation, makes Medical needleless injector reaches " energy accumulating state " and the operation of control excitation is very convenient so that this medical needleless injector can It is rapidly performed by repeatedly continuous injection, can realize preset large dosage of medicine by the way that multiple micro-injection is cumulative easily and fast Object injection, overcomes the deficiency that previous needleless injector is simply possible to use in drug dose injection, has expanded needleless injector and faced The application range in bed injection field.In addition, its structure is simple, to implement to be easy, element usage is high, and cost of manufacture is cheap, for The promotion and popularization of medical needleless injector are also of great significance.

This medical needleless injector in clinical application, can be as needed and being prepared into terminal injecting assembly disposably makes With or be recycled for multiple times.When terminal injecting assembly is disposable, medical fluid can be directly pre-stored in terminal injecting assembly, Injection orifice 12 is subjected to closure processing, terminal injecting assembly is whole in market circulation as the packaging of medical fluid；As terminal is injected Component is recycled for multiple times, then needs to take medicine to operate in view of terminal injecting assembly, injection orifice 12 is connected external lead Pipe drives piston 37 to move backward can be realized and take medicine and pulling back push rod 27, and this operation and the accessory used exist Not rarely seen in existing needleless injector, so it will not be repeated.

Referring to shown in Fig. 7,8,9, in this medical needleless injector, hammer body 16 is located in bore 14 and is only axially movable It is relatively easy to realize, an axially extending guide groove 31 can be provided on the upper side wall of bore 14, and the upside of hammer body 16 is equipped with The guiding rib 29 being in sliding fit with the sliding chute cooperates through guide groove 31 and guiding rib 29, makes hammer body 16 only can be axial in bore 14 It is mobile, without relatively rotating.

Referring to Fig. 3, shown in 4,5,6, in this medical needleless injector, it is contemplated that in medical needleless injector work, neck The dynamics that pipe 9, thread head 11 and bore 14 need to bear is larger, therefore the intensity that gun barrel 5 needs to increase, and in contrast, gun rack 8 needs The dynamics to be born is smaller, if gun body is made of same material, certainly will there is unreasonable place, for this purpose, in the present invention, Gun rack 8 is made of composite material, and gun barrel 5, neck tube 9 and thread head 11 are integrally formed and are made of metal material, gun barrel 5 Downside handles through aperture and is connected to bore 14 with the driving chamber 13 of downside, hammer body 16 can be driven in rifle to recycle dragging component It is moved backward in thorax 14.Thus one, it both ensure that medical needleless injector had enough intensity, work that can be steady in a long-term Make, and reduce the weight of medical needleless injector to greatest extent, keeps it light and handy convenient；Meanwhile gun body uses gun barrel 5 and rifle The split type structure of frame 8, also favorably with manufacture and reduce material cost.

Referring to shown in Figure 17,19,24, in this medical needleless injector clinical application, terminal injecting assembly needs for medicine Liquid provides biggish pressure just and the purpose of Needleless injection can be achieved, that is, 16 front end of hammer body and 27 rear end of push rod is required to occur fiercely It hits, in order to guarantee good impact effects of holding that 16 front end of hammer body and 27 rear end of push rod can be steady in a long-term, the hammer body 16 front ends and 27 tail end of push rod are respectively provided with a shock portion 39, the 39 one side hardness with higher of shock portion, to guarantee Moment completion is hit, reducing elastic properties of materials influences energy transmission bring in collision process, and on the other hand it has higher Intensity extends working life, therefore shock portion 39 is made of high-intensitive, high rigidity material to improve its impact resistance energy.

Referring to Fig. 3, shown in 4, in this medical needleless injector, push type alarm 22 reaches the shape that loads in striker assembly State Shi Erxiang operator issues warning, is triggering foundation, in the prior art this kind of pressing with the position of 16 rear end of hammer body Formula alarm 22 is relatively common, if push type alarm 22 controls working condition through a trigger switch 20, when hammer body 16 is in rifle When being moved rearwardly into 16 rear end of hammer body in thorax 14 and supporting trigger switch 20, push type alarm 22 will be issued and be warned, when hammer body 16 When being excited and moving forward, trigger switch 20 will automatically reset and push type alarm 22 is made to stop issuing warning.But in order to make this The internal structure of medical needleless injector is more compact more compact with shape, and push type alarm 22 is preferentially set using split type Meter, i.e. the push type alarm 22 are made of the trigger switch 20 and alarm body being connected through conducting wire, trigger switch 20 It is fixed on the rear side of bore 14, and alarm body is placed in inside the handle 6 of gun body.

Referring to Fig. 3, shown in 12,13, in this medical needleless injector, driving wheel 19 and a reversed back-stop mechanism cooperate and It can only rotate forward, transmit the upside of transmission belt 24 can only from the front to the back and the transmission of irreversible row, the motivation is in foregoing description In have been carried out detailed elaboration, can easily realize this technical purpose in the prior art, such as can be used as divided into Meter:

Referring to shown in Figure 11,12, the reversed back-stop mechanism is made of ratchet 36 and pawl 33；Ratchet 36 is located at actively The side of wheel 19, the two is coaxial and relatively fixed, for proof strength and reduces cost of manufacture, ratchet 36 and driving wheel 19 use Integrated design；Pawl 33 is then by providing support with the relatively-stationary shaft of gun body；Ratchet 36 only can be just under the cooperation of pawl 33 To rotation, and make with the relatively-stationary driving wheel 19 of ratchet 36 also only can positive direction rotate, realize transmission belt 24 upside only may be used The technical purpose transmitted from the front to the back.

Furthermore, in this medical needleless injector, in order to ensure medical needleless injector can stablize safe work Make, the gun body, striker assembly and terminal injecting assembly there should be following relationship:

1. as shown in figure 15, when the drug in terminal injecting assembly is in specified maximum reserves, thread bush 2 and thread head 11 can be combined connection in the case where 27 tail end of push rod does not protrude into bore 14, and guarantee that terminal injecting assembly is combined with gun body Securely, it thus one can guarantee that terminal injecting assembly can be combined in specified maximum reserves with gun body, and injection dosage can be carried out Any adjusting, while combine terminal injecting assembly can when striker assembly is not in and loads state with gun body, improve The portability of this medical needleless injector.

2. as shown in figure 16, when the rotation of thread bush 2 extremely reaches minimum distance with thread head 11 and piston 37 is located at medicine-storing tube 1 When front end, the tail end of push rod 27 is located exactly at the critical part of bore 14 Yu 9 inner cavity of neck tube, even if striker assembly works on, Hammer body 16 can not also hit the tail end of push rod 27；Thus one, when on the one hand ensure that the work of this medical needleless injector, drug storage Drug in cylinder 1 can be completely injected, after on the other hand then ensure that the drug injection in medicine-storing tube 1, even if percussion hammer Component works on, and the impact force generated will not damage terminal injecting assembly.

3. two elastic strings 17 are in non-stretching shape as shown in figure 17, when 16 front end of hammer body and 14 front end of bore are supported State, thus come after guaranteeing that each hammer body 16 excites, elastic string 17 will not all generate the pulling force for preventing hammer body 16 from moving forward, to greatest extent The kinetic energy possessed before colliding of raising hammer body 16；When injection dosage is set as maximum by adjustment terminal injecting assembly When definite value, i.e., when the length that 27 tail end of push rod protrudes into bore 14 reaches maximum, if 16 front end of hammer body is contacted with 27 tail end of push rod, Two elastic strings 17 are in unstretched condition, thus come guarantee hammer body 16 every time excitation and after being hit with push rod 27, no longer Thrust is generated to push rod 27, it is ensured that the shock moment that hammer body 16 and push rod 27 occur completes, and medical fluid is by infusing after the completion of avoiding shock Perforation 12 is to outward leakage.

Furthermore, referring to shown in Fig. 1,16, this medical needleless injector is in clinical application, in injection process, when Multiple micro-injection is the sum of cumulative reach default injection dosage after, 27 tail end of push rod exits bore 14 completely, even if continuing to pull Trigger action 7 makes striker assembly work on, and can not also carry out drug injection again, operation is safer, and injection dosage is more accurate. But the corresponding relationship that in actual operation, need to observe station location marker 3 and scale 10 at observation window 4 just can determine whether that 27 tail end of push rod is No to exit bore 14 completely, such as observation not in time, still carries out extra operation after drug injection reaches default injection dosage, It certainly will be idle work, it is all unhelpful in patient in operator, and mode visually determines whether drug injection reaches default note Dosage is penetrated, certain error can be generated, influences the accuracy of injection dosage, for this purpose, the present invention also has following improvement:

I.e. as shown in figure 18, the push type alarm 22 is connected with one second trigger switch 40, the second touching through conducting wire Hair switch 40 is installed in the front side of bore 14, after the front end of hammer body 16 is supported with the front end face of bore 14, the second trigger switch 40 are pressed by 16 front end of hammer body and push type alarm 22 are promoted to issue warning, and thus one, when medical needleless injector works When, after the front end face of 16 front end of hammer body and bore 14 is supported, 27 rear end of push rod is ejected bore 14 completely, that is, has been completed The drug injection of preset dose, push type alarm 22 will be issued and be warned at this time, with prompt operator no longer need to do it is unnecessary Operation only need to pull trigger 7 again after the completion of operator clearly injects, move hammer body 16 slightly rearward and with second Trigger switch 40 is detached from, and push type alarm 22 will stop working.

Furthermore, referring to Fig. 3, shown in 12,13, in this medical needleless injector, the downside of hammer body 16, which is equipped with, is dragged Suspension mechanism 30, the towing mechanism 30 are used to move backward with fin block 18 is pulled with the cooperation of fin block 18 is pulled, and are based on this technology Purpose, towing mechanism 30 can be the convex block by extending downwardly on the downside of hammer body 16, but in view of this design has certain do not conform to Reason place then pulls that the stability engaged therewith of fin block 18 is poor, and hammer body 16 holds very much if on the one hand convex block extends downwardly shorter Easily " cock off ", if on the other hand convex block extend downwardly it is longer, then will certainly make to keep on the upside of hammer body 16 and transmission belt 24 compared with Big spacing increases the shearing force for pulling fin block 18 and transmission belt 24, while being also unfavorable for reducing medical needleless injector Overall volume, therefore in the present invention, following design can be used in towing mechanism 30:

I.e. as shown in Figure 7,8, the towing mechanism 30 is to pull slot, pulls the downside that slot is provided with hammer body 16, drags The front end of hanging groove extends to the front end face of hammer body 16, and the rear end for pulling slot does not extend to the rear end of hammer body 16, thus makes to pull Slot has a vertical rear end face；Pulling fin block 18 can move backward along the vallecular cavity for pulling slot, pull fin block 18 and move backward Hammer body 16 can be driven to after supporting with the rear end face for pulling slot to move with it.

Furthermore, referring to shown in Figure 10-13, in this medical needleless injector, the transmission of stablizing of transmission belt 24 is The necessary factor for guaranteeing this medical needleless injector steady operation is transmitted driving striker assembly to be realized during loading state 24 stress of band is larger, the support that can be provided by the self-strength and raising driving wheel 19 and driven wheel 25 that increase transmission belt 24 Power may be implemented it and stablize transmission, but enforcement difficulty is larger, and transmission belt 24 is easy to the fortune that top stress is excessive and disengaging is envisioned Row track, for this purpose, the present invention also has following improvement:

One and the relatively-stationary leading truck 32 of gun rack 8 are equipped in the driving chamber 13, which is located at actively Between wheel 19 and driven wheel 25, and upper surface is parallel with 24 upper inside walls of transmission belt respectively, abutting, thus guarantees transmission belt 24 Upside still can be kept predetermined direction to transmit backward by after pulling the resistance that fin block 18 applies, at the same time, due to leading truck 32 It is arranged in driving chamber 13, substantially increases the intensity of gun rack 8；The leading truck 32 can be integrally formed with gun rack 8, also can be single It is fixedly connected through the modes such as screw or bonding with gun rack 8 after alone becoming type.

Furthermore, referring to Fig. 3, shown in 10,13, in this medical needleless injector, be moved to when pulling fin block 18 When 19 surface of driving wheel, striker assembly reaches the state of loading just, can ensure that pulling fin block 18 and towing mechanism 30 protects at this time Keep steady it is fixed support state so that striker assembly can stable maintenance load state；When continue cocking 7 make transmission belt 24 after When resuming defeated, the dragging fin block 18 cooperated with towing mechanism 30 will be moved with transmission belt 24 along 19 rear side profile of driving wheel, And then be gradually detached from towing mechanism 30, so that hammer body 16 is excited.It can find in above process, pull fin block 18 and pull machine During structure 30 is detached from, pulls fin block 18 and drive hammer body 16 to move backward with the displacement component after a horizontal direction, one As for, the trigger switch 20 of existing conventional push type alarm 22 all has certain stroke, but stroke is all smaller, It is difficult to meet this one stroke that hammer body 16 moves backward in excitation process, such as needs special push type alarm 22, it is clear that The manufacturing cost of this medical needleless injector can be improved, for this purpose, the present invention has following improve to hammer body 16:

I.e. as shown in figure 19,16 rear end of hammer body is equipped with a key seat 42, is equipped with the ejector pin to extend back in key seat 42 43, spring 41 is equipped on front side of ejector pin 43 and makes hammer body 16 and ejector pin 43 is whole can carry out elastic telescopic, and hammer body 16 and ejector pin 43 are same Axis；The push switch of push type alarm 22 is located at the dead astern of ejector pin 43；When state is loaded in striker assembly realization, ejector pin 43 Rear end supports push switch just and push type alarm 22 is made to issue warning, pulls fin block 18 and 30 disengaging of towing mechanism Before, which is in incomplete compressive state always.

Furthermore, it when this medical needleless injector clinical application, is realized in state procedure of loading in striker assembly, hammer Body 16 moves backward the pulling force that need to overcome two elastic strings 17, this allows for circulation and pulls the biggish driving force of component offer, especially Stabilization, the one-way transmission of transmission belt 24 are basic key, therefore recycling dragging component also has following technical characteristic:

The transmission belt 24 uses synchromesh gear belt, and driving wheel 19 uses corresponding gear with follower；

Or the transmission belt 24 uses chain, driving wheel 19 uses corresponding sprocket wheel with follower；

Or the transmission belt 24 uses V-belt, driving wheel 19 uses corresponding groove profile belt wheel with follower；

As shown in Figure 10,11, the dragging fin block 18 is made of integrally formed fin seat 35 with fin 34, and the two is hung down Directly, and fin 34 is located at the side of fin seat 35, and fin seat 35 is fixed in transmission belt 24 and can provide support for fin 34；Due to dragging When dragging component operation, pulling fin block 18 need to be mobile with transmission belt 24, and is bent in the operation of transmission belt 24, therefore fin seat 35 Length in 24 transmission direction of transmission belt should be designed in conjunction with the diameter of driving wheel 19 and follower, guarantee that pulling fin block 18 exists It is safe with the movement of transmission belt 24 by can still stablize when driving wheel 19 and follower.

Furthermore, referring to Fig. 3, shown in 4, this medical needleless injector in clinical use, need hand-held be Column operation, is of great significance convenient for hand-held characteristic, and gun body and trigger component are constructed using gun-shaped, in order to drag circulation It drags component and this gun-shaped construction coincide, the driving wheel 19 is big compared with 25 diameter of driven wheel, tends to the track of transmission belt 24 Triangle, it is pre-small post-large, easily facilitate hand-held.

Furthermore, referring to Fig. 3, shown in 10-13, in this medical needleless injector, one-way driving mechanism 21 is arranged It will drive driving wheel 19 is positive to turn by one-way driving mechanism 21 between trigger 7 and driving wheel 19, when trigger 7 is swung backward It is dynamic, it is seen that 21 one side of one-way driving mechanism need to convert the swing of trigger 7 to the rotation of single direction, on the other hand then The effect of power transmission is born, finally to drive driving wheel 19 to rotate forward, is based on the above technical purpose, one-way driving mechanism 21 Using existing pawl ratchet mechanism, driving member be can be realized in addition, and pawl ratchet mechanism only absorbs production when trigger 7 is swung backward Raw driving force, and ratchet is made only to generate rotation when trigger 7 is swung backward, then ratchet carries out transmission and power by driving member After the adjustment of square direction, driving wheel 19 is driven to rotate forward indirectly, link chain mechanism can be used in driving member, and working principle is as voluntarily Vehicle driving method is similar, meanwhile, the common gear mechanism of machinery field can also be used in driving member.But in view of such as single-direction transmission machine Structure 21 using the above structure, can make medical needleless injector internal structure not compact enough, volume is not small and exquisite enough, for this purpose, this hair It is bright that there is following improve to one-way driving mechanism 21:

I.e. as depicted in figs. 20-23, the one-way driving mechanism 21 is by a ratchet mechanism 48 and a set of planetary gear speed reducing mechanism It constitutes；The ratchet mechanism 48 is arranged between main shaft 23 and trigger 7, can be as shown in figure 23, is provided on the side wall of main shaft 23 Ratchet 49, and pawl 50 is installed at the axis hole of trigger 7, pawl 50 and ratchet 49 cooperate, driving when swinging backward trigger 7 only Main shaft 23 rotates；The planetary gear speed reducing mechanism is by 47, three planetary gears 46 of internal gear, 45 structure of central gear 44 and planet carrier At internal gear 47 is fixed on the side of driving wheel 19, and driving wheel 19 is supported by main shaft 23 and the two can relatively rotate, central gear 44 are fixed on main shaft 23, and planet carrier 45 is relatively fixed with gun body and keeps the gear shaft position of three planetary gears 46 constant；It is described Main shaft 23, driving wheel 19, internal gear 47, central gear 44 4 it is coaxial.Thus one, it will be driven when trigger 7 is swung backward Central gear 44 rotates, and central gear 44 drives internal gear 47 to rotate through planetary gear 46, finally makes driving wheel 19 that positive turn occur Dynamic, the present invention uses planetary gear speed reducing mechanism in one-way driving mechanism 21, and one side can play good slowing effect, make Trigger 7 when pulling backward required dynamics be suitable for, rapid operation, on the other hand its play the role of torque direction adjustment, it is ensured that When trigger 7 is swung backward, driving wheel 19 occur rotation be forward direction, in addition, this design so that one-way driving mechanism 21 more It is compact, improve the property easy to use of medical needleless injector.

Furthermore, referring to Fig. 3, shown in 4, in this medical needleless injector, the front end of push rod 27 and piston 37 are solid Fixed connection, and rear end then according to injection dosage need and it is different degrees of protrude into bore 14, therefore push rod 27 need to have it is longer Length, since the length of push rod 27 is longer and stress is larger in the medical needleless injector course of work, in order to avoid its generation It is bent and the accuracy of injection dosage is affected, it is contemplated that push rod 27 is made of high-strength material, but is thus mentioned High requirement of the push rod 27 to making material, improves the cost of manufacture of medical needleless injector, therefore the present invention has push rod 27 There is further improvement:

I.e. as shown in Figure 14,24, the push rod 27 is equipped with the guiding bolt 38 of one with its one, and the two is coaxial, and leads Big compared with 27 diameter of push rod to bolt 38, after terminal injecting assembly is combined with gun body, guiding bolt 38 is located in neck tube 9, is oriented to bolt 38 Match the axial movement offer guiding combined into push rod 27 with 9 inner cavity of neck tube；Meanwhile the outer of guiding bolt 38 is arranged in station location marker 3 On wall, viewing location mark 3 and the corresponding relationship of the scale 10 at observation window 4 that thus can be more convenient, be injection dosage It is default provide it is convenient.

Furthermore, referring to shown in Figure 24, in above-mentioned medical needleless injector, the medicine-storing tube 1 is using saturating Bright material, outer wall are labeled with dose scale 51, can determine whether drug storage by the relative position of observation piston 37 and dose scale 51 Medicament total amount in cylinder 1.

Claims

1. a kind of medical needleless injector, including terminal injecting assembly, terminal injecting assembly includes the drug storage for being slidingly sealed cooperation Cylinder and piston, medicine-storing tube front end are equipped with injection orifice, are connected with push rod on rear side of piston；It is characterized by further comprising:

Gun body is made of the gun rack and gun barrel being fixedly connected；Cylindrical bore is equipped in gun barrel, the two sides of bore are respectively provided with The front end of one side chamber communicated therewith, gun barrel is fixed with thread head through neck tube, and neck tube side wall is provided with observation window with a scale, neck tube Inner cavity, thread head inner cavity and bore three are coaxial, and neck tube internal diameter is small compared with bore；The tail end of gun rack is held equipped with what is extended downwardly The driving chamber for being equipped with the downside positioned at bore in gun rack and being communicated with bore；

Striker assembly is made of hammer body, elastic string and push type alarm；Hammer body is located in bore and is only axially movable, The downside of hammer body is equipped with towing mechanism；Elastic string is equipped with two, is located at that two sides are intracavitary, and elastic string one end is connect with hammer body, The other end is then connect with gun body；Push type alarm includes the trigger switch of control its work, and trigger switch is placed in bore Rear side；When trigger switch is supported in the rear end of hammer body, push type alarm issues warning, and two elastic strings are in tensional state, this When striker assembly be in and load state；It will quickly move forward after hammer body excitation and impact force is generated to front side member；

Circulation pulls component comprising a transmission belt, the driven wheel and driving wheel that transmission belt is arranged by front and back support and be located at and drive Move intracavitary, and the upside of transmission belt is parallel with hammer body axis；Driving wheel cooperates with a reversed back-stop mechanism and can only rotate forward, Making the upside of transmission belt can only transmit from the front to the back；It is installed in transmission belt there are two dragging fin block separately, when dragging fin block When moving from the front to the back with transmission belt, which will cooperate with towing mechanism and hammer body is driven to move backward, when the dragging When fin block is moved to right above driving wheel, striker assembly reaches the state of loading, when the dragging fin block moves down at driving wheel When, pulling fin block will be detached from towing mechanism and excite hammer body；

Trigger component comprising trigger and one-way driving mechanism, trigger are located at the front side of handle and along main shaft swing, main shafts Both ends be fixed on intracorporal two axle bed of rifle and limited, trigger drives lower end that can reset forward automatically by resetting-mechanism；It is unidirectional to pass Motivation structure is set between trigger and driving wheel, and driving wheel forward direction will be driven to turn when trigger is swung backward by one-way driving mechanism It is dynamic；

In the terminal injecting assembly, the rear end of medicine-storing tube is equipped with the thread bush cooperated with thread head, and push rod is equipped with position Mark；After thread bush is combined with thread head, putting back-end passes through thread head and neck tube and enters in bore and can be hit by hammer body It hits, push rod is adjusted by rotation thread bush and protrudes into the length in bore, can be sentenced by the scale on observation window with station location marker Disconnected push rod protrudes into the length value in bore, i.e., clear injection dosage；

The one-way driving mechanism is made of a ratchet mechanism and a set of planetary gear speed reducing mechanism；The ratchet mechanism setting exists Between main shaft and trigger, driving spindle is rotated when swinging backward trigger only；The planetary gear speed reducing mechanism is by internal gear, three Planetary gear, central gear and planet carrier are constituted, and internal gear is arranged in the side of driving wheel, and driving wheel is by main shaft support and the two can It relatively rotates, central gear is fixed on main shaft, and planet carrier is relatively fixed with gun body and makes the gear shaft position of three planetary gears It is constant；The main shaft, driving wheel, internal gear, central gear are coaxial.

2. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that:

The transmission belt uses synchromesh gear belt, and driving wheel uses corresponding gear with follower；

3. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that: the dragging fin block by Integrally formed fin seat and fin are constituted, and the two is vertical, and fin is located at the side of fin seat, fin seat be fixed in transmission belt and can Support is provided for fin；The push type alarm uses split-type design, i.e., the push type alarm is by through conducting wire Connected trigger switch and alarm body are constituted, and trigger switch is fixed on the rear side of bore, and alarm body is placed in rifle Inside the handle of body.

4. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that: the upside of the bore Be provided with an axially extending guide groove on wall, and the upside of hammer body is equipped with the guiding rib being in sliding fit with the sliding chute, through guide groove with Guiding rib cooperation, is axially movable hammer body only in bore, without relatively rotating.

5. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that: the gun rack is using multiple Condensation material is made, and gun barrel, neck tube and thread head are integrally formed and are made of metal material, the downside of gun barrel handle through aperture and It is connected to bore with the driving chamber of downside.

6. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that: the hammer body front end with Push rod tail end is respectively provided with a shock portion, and the shock portion is made of high-intensitive, high rigidity material.

7. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that: the reversed check machine Structure is made of ratchet and pawl；Ratchet is located at the side of driving wheel, and the two is coaxial and relatively fixed, and ratchet and driving wheel use one Body design；Pawl is then by providing support with the relatively-stationary shaft of gun body；Ratchet can only rotate forward under the cooperation of pawl, and Making also only can positive direction rotation with the relatively-stationary driving wheel of ratchet.

8. a kind of medical needleless injector of large dosage according to claim 1, it is characterised in that: set in the driving chamber Have one and the relatively-stationary leading truck of gun rack, the leading truck between driving wheel and driven wheel, and upper surface respectively with transmission Band upper inside walls are parallel, are close to.