CN114504726A

CN114504726A - Vein injection excitation device capable of adjusting flow speed

Info

Publication number: CN114504726A
Application number: CN202210411459.5A
Authority: CN
Inventors: 张婵娟; 朱起鹏; 毛贻静
Original assignee: Zhejiang Curaway Medical Technology Co ltd
Current assignee: Zhejiang Curaway Medical Technology Co ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-05-17
Anticipated expiration: 2042-04-19
Also published as: CN114504726B

Abstract

The invention relates to the technical field of medical instruments, in particular to a vein injection excitation device with adjustable flow speed, which comprises a gun body, a plunger which is arranged on the gun body in a penetrating way and can be pushed along the axial direction of the gun body, and a trigger mechanism, wherein the trigger mechanism comprises a trigger which is rotationally connected to the gun body and a speed regulation mechanism; the speed regulating mechanism comprises a limiting part and an adjusting part; the limiting part is positioned on a pressing path of the pressing part and is rotatably connected in the gun body, the maximum pressing stroke amount of the pressing part is limited through the outer peripheral surface of the limiting part, and the outer peripheral surface of the limiting part at least comprises two abutting positions with different distances from the rotating axis of the limiting part; the adjusting part is used for controlling the limiting part to rotate and locking the limiting part. Through setting up speed regulating mechanism to can adjust the trigger through operation speed regulating mechanism and press the biggest stroke volume of pressing the portion of pressing, and then the distance of advance of control plunger, so in order to realize adjusting out gluey volume, the purpose of control injection speed.

Description

Vein injection excitation device capable of adjusting flow speed

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vein injection excitation device capable of adjusting flow rate.

Background

A vein injection excitation device, also called a glue gun, is mainly used for treating varicose veins, and mainly comprises the steps of injecting a quantitative filling material (namely glue) into a vein at a fixed speed through the glue gun to completely block the varicose veins so as to achieve the purpose of treatment.

For example, patent application No. CN201080017353.2 discloses a method and apparatus for treating venous occlusion of venous insufficiency.

The glue gun disclosed in the above patent can only spray at a constant speed, that is, the glue output amount of a single shot is constant, however, in practice, for the same patient, the location and thickness of the diseased blood vessel have a certain difference, and the viscosity, fluidity and the like of the required injection tamponade have a difference, which requires to correspondingly adjust the glue output amount of the single shot of the glue gun to control the injection speed, so the existing glue gun with the constant speed still needs to be improved.

Disclosure of Invention

In order to solve at least one of the technical problems mentioned in the background, the invention aims to provide a vein injection excitation device with adjustable flow rate.

In order to achieve the purpose, the invention provides the following technical scheme:

a vein injection excitation device capable of adjusting flow speed comprises a gun body, a plunger which is arranged on the gun body in a penetrating mode and can be pushed along the axial direction of the gun body, a trigger mechanism and a speed adjusting mechanism, wherein the trigger mechanism comprises a trigger which is connected to the gun body in a rotating mode; the trigger comprises a pressing part and a pushing part, and the pushing part pushes the plunger to advance by a corresponding distance according to the pressing stroke amount of the pressing part; the speed regulating mechanism comprises a limiting part and an adjusting part; the limiting part is positioned on a pressing path of the pressing part and is rotationally connected in the gun body, the maximum pressing stroke amount of the pressing part is limited through the outer peripheral surface of the limiting part, the outer peripheral surface of the limiting part at least comprises two abutting positions with different distances from a rotating shaft center of the limiting part, and the abutting positions are sequentially distributed along the circumferential direction of the limiting part and are used for the pressing part to abut against; the adjusting part is used for controlling the limiting part to rotate and locking the limiting part.

Preferably, the stopper has a D-shaped structure or a cam structure.

Preferably, the adjusting part comprises a knob and a positioning structure, the knob is arranged on the limiting part and used for driving the limiting part to rotate, the knob is located outside the gun body and can rotate relative to the gun body, and the positioning structure is used for circumferentially positioning the limiting part after the limiting part rotates to a preset angle.

Preferably, the positioning structure comprises a fixed shaft, an elastic piece, a positioning bulge and a positioning hole; the fixed shaft is fixed in the gun body, the limiting part is sleeved on the fixed shaft in a penetrating manner, and the limiting part and the fixed shaft are axially arranged in a relative sliding manner and are circumferentially arranged in a relative rotating manner; the positioning protrusions are arranged at the outer end part of the limiting part, the positioning holes are formed in the gun body and are positioned on the opposite sides of the positioning protrusions so that the positioning protrusions can be inserted into the positioning holes, and the positioning holes at least comprise two positioning holes which are sequentially distributed along the rotating direction of the limiting part; the elastic piece is used for driving the limiting part to keep the trend of moving towards one side where the jack is located; when the positioning bulge is inserted into the positioning hole, the limiting part is circumferentially positioned relative to the fixed shaft.

Preferably, be equipped with the locating piece on the periphery wall of knob, be equipped with the spacing groove on the rifle body outer wall, the locating piece is at the spacing inslot activity, and when the locating piece was inconsistent with the terminal side cell wall of spacing groove, the location arch aligns with corresponding locating hole.

Preferably, location structure still includes the torsional spring subassembly, the torsional spring subassembly includes torsional spring and installation department, the installation department is installed at the rifle internally, the torsional spring cover is established on the fixed axle and is inlayed the dress in spacing portion, the first end butt of torsional spring is in spacing portion, and the second end butt just slides the setting in relative installation department on the installation department outer wall.

Preferably, the torsion spring assembly further comprises a guide plate fixed in the gun body, a separation-preventing groove for the second end of the torsion spring to be installed is formed between the guide plate and the installation part, and the second end of the torsion spring slides in the separation-preventing groove.

Preferably, the trigger mechanism further comprises a fixing pin and a first reset torsion spring, the fixing pin is fixed in the gun body, the pressing part is rotatably connected to the fixing pin, and the first reset torsion spring is sleeved on the fixing pin and used for driving the pressing part to rotate and reset; the lower end of the pressing part extends downwards to form a stopping part, and the stopping part abuts against the inner wall of the gun body when the pressing part is in a reset state.

Preferably, the pushing part comprises a shifting block, a connecting shaft and a second reset torsion spring, the connecting shaft is fixed at the upper end of the pressing part, and the shifting block is rotatably connected to the connecting shaft; the front end of the shifting block is provided with a shifting structure for pushing the plunger to advance, and the second reset torsion spring is sleeved on the connecting shaft and used for driving the front end of the shifting block to keep a trend of lifting.

Preferably, the shifting structure comprises shifting teeth arranged at the upper part of the front end of the shifting block, a rack extending along the axial direction of the plunger is arranged on the bottom wall of the plunger, and the shifting teeth are meshed with the rack; or the shifting structure comprises a shifting piece arranged on the upper part of the front end of the shifting block, the shifting piece is abutted against the bottom wall of the plunger, and the plunger is pushed to advance through the friction force between the shifting piece and the bottom wall of the plunger.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the speed regulating mechanism is arranged, so that the maximum pressing stroke of the pressing part of the trigger can be regulated by operating the speed regulating mechanism, and the advancing distance of the plunger is further controlled, so that the purposes of regulating the glue outlet amount and controlling the injection speed are realized.

Secondly, in the scheme, the speed regulating mechanism is mainly realized through the rotating limiting part, the peripheral surface of the limiting part is divided into at least two abutting positions with different distances from the rotating axis of the limiting part, each abutting position is equivalent to a gear, the abutting position is closer to the rotating axis of the limiting part, when the rotating limiting part rotates to a working position, the maximum stroke of the pressing part of the trigger is larger, and the pushing part can push the plunger to move forwards for a larger distance by pressing the pressing part under the gear, so that the single-time excitation glue-out amount is larger, and the quick injection device is suitable for the condition of quick injection; on the contrary, apart from the butt position that spacing portion rotation axis is far away, it is when rotating to operating position, and the biggest stroke volume of pressing the splenium of trigger is also less, so under this gear, press down the splenium and can make the distance that pushing part promoted the plunger and go forward less to it is also less to make the single arouse out gluey volume, is fit for the condition of pushing slowly.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic view of the internal structure of the present invention;

FIG. 4 is a cross-sectional view of the present invention;

FIG. 5 is a schematic view of the cut surface of the position limiting portion in a working position;

FIG. 6 is a schematic view of the arc surface of the limiting portion in a working position;

FIG. 7 is a schematic structural view of a speed regulating mechanism;

FIG. 8 is an exploded view of the governor mechanism;

FIG. 9 is an enlarged view of a portion of the gun body at the location of the knob;

FIG. 10 is a schematic view of a cam structure for the position-limiting part;

FIG. 11 is a schematic structural view of the trigger mechanism;

FIG. 12 is a schematic view showing the internal structure of the trigger mechanism;

fig. 13 is a schematic view of the mounting structure of the first and second return torsion springs.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-13, the present embodiment provides a flow rate adjustable intravenous injection trigger device, which includes a gun body 1, a plunger 3 penetrating the gun body 1 and capable of being pushed axially along the gun body 1, and a trigger mechanism, wherein in practical applications, a syringe filled with glue (i.e. a filling material) is connected to a head of the gun body 1, the plunger 3 is driven to advance by pressing the trigger mechanism, and the plunger 3 advances to push a piston of the syringe to advance, so as to inject the glue in the syringe.

As shown in fig. 2, the trigger mechanism comprises a trigger 2 rotatably connected to the gun body 1, and specifically, the trigger 2 is installed at the handle position of the gun body 1; as shown in fig. 2 and 11 in conjunction, the trigger 2 includes a pressing portion 21 and a pushing portion 22, and the pushing portion 22 pushes the plunger 3 forward by a corresponding distance according to the amount of pressing stroke of the pressing portion 21. That is, the shorter the pressing stroke of the pressing portion 21, the shorter the distance the plunger 3 advances, and the smaller the glue discharging amount per one shot.

For ease of understanding, the present embodiment provides a brief description of some technical terms appearing herein: the pressing part 21 is pressed from the initial position to the maximum stroke position to be excited once, namely, excited once; the maximum stroke position refers to a maximum position that can be finally reached during the pressing of the pressing portion 21, and the corresponding maximum pressing stroke amount refers to a stroke amount of the pressing portion 21 from the initial position to the maximum stroke position.

In order to adjust the bolus speed, in this embodiment, a speed adjusting mechanism is further included; the speed regulating mechanism comprises a limiting part 4 and an adjusting part.

As shown in fig. 3 and 4, the stopper portion 4 is located on the pressing path of the pressing portion 21 and is rotatably connected in the gun body 1, and the purpose of the present embodiment is to provide the stopper portion 4 on the pressing path of the pressing portion 21 is to stop the pressing portion 21 so as to limit the maximum pressing stroke amount of the pressing portion 21.

In this embodiment, the maximum pressing stroke of the pressing portion 21 is limited mainly by the outer peripheral surface of the limiting portion 4, the outer peripheral surface of the limiting portion 4 at least includes two abutting positions with different distances from the rotation axis of the limiting portion 4, and the abutting positions may be area surfaces on the outer peripheral surface of the limiting portion 4, or may be lines or points on the outer peripheral surface of the limiting portion 4, which is not specifically limited herein.

The abutting positions are distributed in sequence along the circumferential direction of the limiting part 4, the abutting positions are mainly used for abutting against the pressing part 21, when the limiting part 4 is rotated to enable one of the abutting positions to reach the working position, the abutting position serves as a part pressed and abutted by the pressing part 21 finally, and the maximum pressing stroke amount of the pressing part 21 is the stroke amount from the initial position to the position of the abutting position.

Because different abutting positions have different distances from the rotating shaft center of the limiting part 4, when the different abutting positions rotate to working positions, the limited maximum pressing stroke amount of the pressing part 21 is also different, and when the abutting positions are closer to the rotating shaft center of the limiting part 4, the limited maximum pressing stroke amount of the pressing part 21 is larger when the abutting positions rotate to the working positions, so that when the pressing part 21 is excited once, the pushing part 22 pushes the plunger 3 to advance for a larger distance, and further the glue discharging amount is larger.

Based on this, each butt position all is equivalent to a gear, rotates the butt position that the axle center is close from spacing portion 4 and is equivalent to high-speed gear, and more glue can be injected to the single arouses, otherwise, far being equivalent to slow gear, less glue can be injected to the single arouse, so when needs inject glue fast, can rotate spacing portion 4 and switch to high-speed gear, when needs inject glue slowly, can rotate spacing portion 4 and switch to slow gear.

In this embodiment, the regulating part is used for controlling the rotation of spacing portion 4 and locks spacing portion 4, drives spacing portion 4 through operating the regulating part and rotates to switch to corresponding gear, when the switching is accomplished, locks spacing portion 4 through the regulating part, prevents that spacing portion 4 from taking place to deflect and breaking away from current gear.

In this embodiment, as shown in fig. 4, 7 and 8, the limiting portion 4 is a D-shaped structure, which is equivalent to cutting a part of a complete disk to form the D-shaped structure, the cutting position forms a tangent plane, and the rotation axis of the limiting portion 4 is the center position of the disk, so that the periphery of the limiting portion 4 of the D-shaped structure is equivalent to two abutting positions, one is a tangent plane region, and the other is an arc-shaped circumferential surface position, where the distance from the tangent plane region position to the rotation axis is shorter, which is equivalent to a fast gear, and the distance from the arc-shaped circumferential surface to the rotation axis is longer, which is equivalent to a slow gear.

When the gear is shifted to the fast gear position, as shown in fig. 5, when the pressing portion 21 is pressed, the inner side wall of the pressing portion 21 finally abuts against the tangent plane, so that a single excitation is completed, and the glue discharging amount is large at the gear. When the gear is shifted to the low gear position, as shown in fig. 6, when the pressing portion 21 is pressed, the inner side wall of the pressing portion 21 finally abuts against the arc-shaped circumferential surface, so that one-time excitation is completed, and the glue discharging amount is small at the gear.

Of course, in other embodiments, the limiting portion 4 may also adopt a cam structure, and as shown in fig. 10, the outer peripheral surface of the limiting portion 4 may include a plurality of abutting positions with different distances from the rotation axis of the limiting portion 4, and the principle of the abutting positions is basically the same as that of the limiting portion 4 with the D-shaped structure, and thus, redundant description is omitted here.

The concrete structure of regulation portion does:

as shown in fig. 2, 7 and 8, the adjusting portion includes a knob 51 and a positioning structure, and the knob 51 is disposed on an outer end of the limiting portion 4 to drive the limiting portion 4 to rotate; the knob 51 is located outside the gun body 1 and can rotate relative to the gun body 1, and the knob 51 is arranged outside the gun body 1 mainly for the convenience of a user to operate the limiting part 4 to rotate outside.

The positioning structure is used for circumferentially positioning the limiting part after the limiting part rotates to a preset angle; the predetermined angle here means that the respective abutment position on the stop portion is rotated to the working position.

As shown in fig. 7 and 8, the positioning structure includes a fixing shaft 521, an elastic member, a positioning protrusion 41 and a positioning hole 12; one end of the fixed shaft 521 is fixed in the gun body 1, the limiting part 4 is sleeved on the fixed shaft 521 in a penetrating manner, the limiting part 4 and the fixed shaft 521 are arranged in an axial relative sliding manner and in a circumferential relative rotating manner, namely, the limiting part 4 can axially slide on the fixed shaft 521 and can also circumferentially rotate on the fixed shaft 521.

The positioning protrusion 41 is arranged at the outer end of the limiting portion 4, the inner end of the knob 51 extends inwards to form a connecting section 511, the connecting section 511 movably penetrates through the gun body 1 and is fixed with the outer end of the limiting portion 4, the positioning protrusion 41 is distributed on the outer side of the connecting section 511, in an assembly state, the positioning protrusion 41 is located inside the gun body 1, the knob 51 is located outside the gun body 1, and the knob 51 is at a distance from the outer wall of the gun body 1 to ensure that the knob 51 can be pressed towards the direction close to the inside of the gun body 1.

As shown in fig. 9, the positioning holes 12 are provided on the gun body 1 and located on opposite sides of the positioning protrusions 41 for the insertion of the positioning protrusions 41, and the positioning holes 12 include at least two and are sequentially distributed along the rotation direction of the limiting portion 4; the elastic piece is used for driving the limiting part 4 to keep the trend of moving towards one side where the jack is located; as shown in fig. 7, the elastic member includes a spring 522, the spring 522 is sleeved on the fixed shaft 521, and two ends of the spring 522 respectively abut against the inner side wall of the gun body 1 and the inner end of the limiting portion 4, or certainly, two ends of the spring 522 can be directly fixed on the inner end of the limiting portion 4 and the inner side wall of the gun body 1.

When the positioning boss 41 is inserted into the positioning hole 12, the stopper portion 4 is held in position in the circumferential direction relative to the fixed shaft 521.

When the gears are switched, firstly, the knob 51 is pressed inwards by overcoming the elastic force of the elastic piece until the positioning protrusion 41 is pushed out from the current positioning hole 12, then the knob 51 is rotated until the knob 51 is rotated to the required gear position, the knob 51 is loosened, at the moment, the limiting part 4 and the positioning protrusion 41 are pushed to integrally move towards the positioning hole 12 under the elastic force of the elastic piece, finally, the positioning protrusion 41 is inserted into the corresponding positioning hole 12, at the moment, the limiting part 4 is locked and cannot continuously rotate, and at the moment, the corresponding abutting position of the limiting part 4 is switched to the working position.

Taking the D-shaped structure of the position-limiting portion 4 as an example, as shown in fig. 8, two positioning protrusions 41 are circumferentially distributed on the outer end portion of the position-limiting portion 4, as shown in fig. 9, 3 positioning holes 12 are correspondingly formed on the gun body 1, the two positioning protrusions 41 can be simultaneously inserted into the middle positioning hole 12 and the left positioning hole 12, or can be simultaneously inserted into the middle positioning hole 12 and the right positioning hole 12, where fig. 9 shows a case where the two positioning protrusions 41 are respectively inserted into the middle positioning hole 12 and the right positioning hole 12; this corresponds to two positioning protrusions 41 as a positioning portion as a whole, and the positioning of the position-limiting portion 4 is realized by matching with the corresponding two positioning holes 12.

In order to facilitate the rotation of the knob 51, the positioning protrusions 41 can be accurately rotated to the corresponding positioning holes 12, as shown in fig. 8, in this embodiment, the positioning block 512 is disposed on the outer wall of the knob 51, correspondingly, as shown in fig. 9, the limiting groove 13 for the movement of the positioning block 512 is disposed on the circumferential side groove wall of the groove 11 of the gun body 1, the limiting groove 13 is in an arc structure, the limiting groove 13 is communicated with the groove 11, the positioning block 512 moves in the limiting groove 13, when the knob 51 is rotated, the positioning block 512 rotates along with the positioning block, when the positioning block 512 abuts against the end side groove wall of the limiting groove 13, the positioning protrusions 41 align with the corresponding positioning holes 12, specifically, the groove walls at the two ends of the limiting groove 13 correspond to the positioning abutting surfaces of the positioning block 512, when the positioning block 512 rotates clockwise along with the knob 51 to abut against the lower end groove wall of the limiting groove 13, the two positioning protrusions 41 just align with the positioning holes 12 on the middle and the right, at the moment, the gear is in one gear; when the positioning block 512 rotates counterclockwise to abut against the upper end groove wall of the limiting groove 13, the two positioning protrusions 41 are aligned with the middle and left positioning holes 12, and at this time, the other gear is located.

In this embodiment, the positioning structure further includes a torsion spring component, as shown in fig. 3, 7 and 8, the torsion spring component includes a torsion spring 523 and a mounting portion 524, the mounting portion 524 is mounted in the gun body 1, the torsion spring 523 is sleeved on the fixed shaft 521 and is embedded on the limiting portion 4, specifically, as shown in fig. 7, an embedding opening 42 is formed in the middle of the limiting portion 4, the torsion spring 523 is embedded in the embedding opening and is sleeved on the fixed shaft 521 along with the limiting portion 4, so that the limiting portion 4 can drive the torsion spring 523 to axially move together with the axial movement relative to the fixed shaft 521.

The first end of the torsion spring 523 abuts against the limiting portion 4, and the second end of the torsion spring 523 abuts against the outer wall of the mounting portion 524 and is arranged in a sliding manner relative to the mounting portion 524 (as shown in fig. 3), so that under the action of the torsion spring 523, the limiting portion 4 can have a tendency of rotating relative to the fixed shaft 521, and the rotating hand feeling of a person when the knob 51 is rotated is improved. The purpose of so setting up installation department 524 is because guarantee that torsional spring 523 can drive spacing portion 4 and rotate, then need support the location to the second end of torsional spring 523, and because when adjusting, axial displacement need take place for spacing portion 4, so just can drive torsional spring 523 and move together, so need make the second end of torsional spring 523 slide and set up on the installation department 524 outer wall, so can realize the support location to the torsional spring 523 second end, can make torsional spring 523 move together along with spacing portion 4 again.

In order to prevent the second end of the torsion spring 523 from being detached from the mounting portion 524, in this embodiment, as shown in fig. 2 and 3, the torsion spring assembly further includes a guide plate 525 fixed in the gun body 1, a detachment prevention groove 526 for the second end of the torsion spring 523 to be installed in is formed between the guide plate 525 and the mounting portion 524, the second end of the torsion spring 523 slides in the detachment prevention groove 526, so that the second end of the torsion spring 523 can only move in the detachment prevention groove 526, and the second end of the torsion spring 523 is difficult to slip from the mounting portion 524 under the limitation of the detachment prevention groove 526.

The trigger mechanism has the specific structure that:

as shown in fig. 11 and 12, the trigger mechanism further includes a fixing pin 23 and a first reset torsion spring 24, as shown in fig. 3, the fixing pin 23 is fixed in the gun body 1, the pressing portion 21 is rotatably connected to the fixing pin 23, as shown in fig. 11-13, the first reset torsion spring 24 is sleeved on the fixing pin 23 to drive the pressing portion 21 to rotate and reset, specifically, one end of the first reset torsion spring 24 abuts against the inner wall of the pressing portion 21 to drive the pressing portion 21 to maintain the tendency of resetting, and the other end of the first reset torsion spring is inserted into the fixing pin 23 or is inserted into a carrier inside the gun body 1, where the carrier may be a plate 1a (as shown in fig. 13) fixed in the gun body, so that after the pressing portion 21 is pressed, the pressing portion 21 is released, and under the elastic force of the first reset torsion spring 24, the pressing portion 21 automatically returns to the initial position to wait for the next pressing operation, this allows the pressing portion 21 to be reset.

In order to prevent the pressing portion 21 from exceeding the initial position when resetting, in the present embodiment, the lower end of the pressing portion 21 extends downward to form a stopping portion 211, and in the resetting state of the pressing portion 21, i.e. the state shown in fig. 4, the stopping portion 211 abuts against the inner wall of the gun body 1, so that the pressing portion 21 cannot continue to rotate under the elastic force of the first reset torsion spring 24.

As shown in fig. 11-13, the pushing portion 22 includes a shifting block 221, a connecting shaft 222 and a second restoring torsion spring 223, the connecting shaft 222 is fixed at the upper end of the pressing portion 21, and the shifting block 221 is rotatably connected to the connecting shaft 222; the front end of the shifting block 221 is provided with a shifting structure for pushing the plunger 3 to advance, the second reset torsion spring 223 is sleeved on the connecting shaft 222 to drive the front end of the shifting block 221 to keep a trend of lifting up, one end of the second reset torsion spring 223 is hooked at the bottom of the front end of the shifting block 221 to keep the front end of the shifting block 221 lifted up, and the other end of the second reset torsion spring 223 is inserted into the connecting shaft 222 or abutted against the upper end wall of the pressing portion 21. So under the effect of second reset torsion spring 223, can make shifting block 221 front end lift up, when pressing according to splenium 21, press the upper end of splenium 21 to move forward, and then drive the toggle structure on shifting block 221 and the shifting block 221 and advance, the toggle structure advances and just promotes plunger 3 and advances, realizes pushing the action.

In this embodiment, as shown in fig. 3, the toggle structure includes a toggle tooth 224 disposed at an upper portion of a front end of the toggle block 221, a rack 31 extending along an axial direction of the plunger 3 is disposed on a bottom wall of the plunger 3, and the toggle tooth 224 is engaged with the rack 31; thus, under the action of the second restoring torsion spring 223, the shifting tooth 224 is driven to abut against the rack 31 to engage with the rack 31, when the pressing portion 21 is pressed, the shifting tooth 224 advances along with the shifting block 221, so that the shifting tooth 224 pushes the rack 31 to advance, and further drives the plunger 3 to advance.

As another alternative embodiment, as shown in fig. 10, the toggle structure includes a dial 225 disposed on an upper portion of a front end of the dial 221, the dial 225 is circular, the dial 225 abuts against a bottom wall of the plunger 3, the plunger 3 is pushed to advance by a friction force between the dial 225 and the bottom wall of the plunger 3, in this way, a pushing action is mainly realized by the friction force between the dial 225 and the bottom wall of the plunger 3, under the action of the second reset torsion spring 223, the front end of the dial 221 is lifted up, the dial 225 abuts against the bottom wall of the plunger 3, at this time, if the pressing portion 21 is pressed, the dial 225 will advance along with the dial 221, and then the dial 225 will push the plunger 3 to advance under the action of the friction force. In order to achieve better pushing effect, in the present embodiment, the bottom wall of the plunger 3 is subjected to a friction treatment, i.e. the bottom wall of the plunger 3 is made rough to increase the friction force.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A vein injection excitation device capable of adjusting flow rate comprises a gun body, a plunger which is arranged on the gun body in a penetrating mode and can be pushed along the axial direction of the gun body, and a trigger mechanism, wherein the trigger mechanism comprises a trigger which is connected to the gun body in a rotating mode, and the vein injection excitation device is characterized by further comprising a speed adjusting mechanism; the trigger comprises a pressing part and a pushing part, and the pushing part pushes the plunger to advance by a corresponding distance according to the pressing stroke amount of the pressing part; the speed regulating mechanism comprises a limiting part and an adjusting part; the limiting part is positioned on a pressing path of the pressing part and is rotationally connected in the gun body, the maximum pressing stroke amount of the pressing part is limited through the outer peripheral surface of the limiting part, the outer peripheral surface of the limiting part at least comprises two abutting positions with different distances from a rotating shaft center of the limiting part, and the abutting positions are sequentially distributed along the circumferential direction of the limiting part and are used for the pressing part to abut against; the adjusting part is used for controlling the limiting part to rotate and locking the limiting part.

2. A flow rate adjustable vein injection stimulation device according to claim 1, wherein the limiting part is of a D-shaped structure or a cam structure.

3. A flow rate adjustable intravenous injection stimulation device as claimed in claim 1, wherein said adjustment portion comprises a knob and a positioning structure, said knob is disposed on said limiting portion for driving said limiting portion to rotate, said knob is disposed outside said gun body and can rotate relative to said gun body, said positioning structure is configured for circumferentially positioning said limiting portion after said limiting portion has rotated to a predetermined angle.

4. A flow rate adjustable intravenous injection stimulation apparatus as claimed in claim 3, wherein said positioning structure comprises a fixed shaft, an elastic member, a positioning protrusion and a positioning hole; the fixed shaft is fixed in the gun body, the limiting part is sleeved on the fixed shaft in a penetrating manner, and the limiting part and the fixed shaft are axially arranged in a relative sliding manner and are circumferentially arranged in a relative rotating manner; the positioning protrusions are arranged at the outer end part of the limiting part, the positioning holes are formed in the gun body and are positioned on the opposite sides of the positioning protrusions so that the positioning protrusions can be inserted into the positioning holes, and the positioning holes at least comprise two positioning holes which are sequentially distributed along the rotating direction of the limiting part; the elastic piece is used for driving the limiting part to keep the trend of moving towards one side where the jack is located; when the positioning bulge is inserted into the positioning hole, the limiting part is circumferentially positioned relative to the fixed shaft.

5. A variable flow rate intravenous injection trigger according to claim 4, wherein the knob has a positioning block on its outer peripheral wall and a retaining groove on its outer wall, the positioning block is movable in the retaining groove, and when the positioning block abuts against the end side walls of the retaining groove, the positioning protrusion is aligned with the corresponding positioning hole.

6. A vein injection excitation device with adjustable flow rate according to claim 5, wherein the positioning structure further comprises a torsion spring assembly, the torsion spring assembly comprises a torsion spring and a mounting portion, the mounting portion is mounted in the gun body, the torsion spring is sleeved on the fixed shaft and embedded on the limiting portion, a first end of the torsion spring abuts against the limiting portion, and a second end of the torsion spring abuts against the outer wall of the mounting portion and is arranged in a sliding manner relative to the mounting portion.

7. A flow rate adjustable intravenous injection stimulation apparatus as claimed in claim 6, wherein said torsion spring assembly further comprises a guide plate fixed within the gun body, wherein a slip-off prevention groove is formed between said guide plate and the mounting portion for receiving the second end of the torsion spring, and wherein the second end of the torsion spring slides within the slip-off prevention groove.

8. A vein injection excitation device with adjustable flow rate according to claim 1, wherein the trigger mechanism further comprises a fixed pin and a first reset torsion spring, the fixed pin is fixed in the gun body, the pressing part is rotationally connected to the fixed pin, and the first reset torsion spring is sleeved on the fixed pin and used for driving the pressing part to rotate and reset; the lower end of the pressing part extends downwards to form a stopping part, and the stopping part abuts against the inner wall of the gun body when the pressing part is in a reset state.

9. A vein injection stimulation device with adjustable flow rate according to claim 8, wherein the pushing part comprises a shifting block, a connecting shaft and a second reset torsion spring, the connecting shaft is fixed at the upper end of the pressing part, and the shifting block is rotatably connected to the connecting shaft; the front end of the shifting block is provided with a shifting structure for pushing the plunger to advance, and the second reset torsion spring is sleeved on the connecting shaft and used for driving the front end of the shifting block to keep a trend of lifting.

10. A flow rate adjustable intravenous injection stimulation apparatus as claimed in claim 9, wherein said toggle structure comprises a toggle tooth disposed at an upper portion of a front end of said toggle block, a rack extending axially along said plunger is disposed on a bottom wall of said plunger, and said toggle tooth is engaged with said rack; or the shifting structure comprises a shifting piece arranged on the upper part of the front end of the shifting block, the shifting piece is abutted against the bottom wall of the plunger, and the plunger is pushed to advance through the friction force between the shifting piece and the bottom wall of the plunger.