CN115569268A - Injection device and injection method - Google Patents

Abstract

The invention provides an injection device and an injection method, wherein the injection device comprises a machine body, a diameter measuring mechanism, a pushing mechanism, a movement measuring mechanism and a control unit, wherein the machine body is provided with an installation area for placing an injector; the diameter measuring mechanism is used for detecting the diameter of the barrel body of the syringe when the syringe is placed in the mounting area; the pushing mechanism is used for pushing a push rod of the injector in the mounting area so as to realize injection; the movement measuring mechanism is connected with the pushing mechanism and is used for measuring the movement amount of the pushing mechanism. The real-time injection amount can be accurately acquired, so that accurate injection control is realized.

Description

Injection device and injection method

Technical Field

The invention relates to the field of injection equipment, in particular to an injection device and an injection method.

Background

In a plurality of fields such as medical treatment, chemical industry, often can need carry out the injection operation, traditional injection operation all is that the push rod that directly promotes the syringe through the manual work carries out the injection operation, and the manual syringe push rod that promotes, inefficiency also is difficult to ensure the uniformity of injection volume, and along with the development of science and technology, some automatic injection equipment appear gradually, for example syringe pump etc..

In the prior art, how to improve the injection precision of an automatic injection device is one of the problems that the skilled person pays attention to, but in the prior art, the injection precision is usually set in advance according to the volume of an injector, but when the scales or the volume of the injector are not marked or are not marked accurately, or the position of the injector is not placed correctly, or when the injector with different volumes is replaced frequently in the actual injection operation, the situation that the input injection quantity and the actual injection quantity have errors is possibly influenced by a control mode of the push rod feeding quantity of the injector input in advance is very likely, and the problems are technical problems to be solved urgently in the field.

Disclosure of Invention

The invention mainly solves the technical problem of providing an injection device capable of detecting the injection amount of an injector.

According to a first aspect, the present application provides an injection device comprising:

the injection device comprises a body, a first connecting piece and a second connecting piece, wherein the body is provided with an installation area for placing an injector;

a diameter measuring mechanism for detecting the diameter of the barrel of a syringe when the syringe is placed in the mounting region;

the pushing mechanism is used for pushing a push rod of the injector in the mounting area so as to realize injection;

the movement measuring mechanism is connected with the pushing mechanism and is used for measuring the movement amount of the pushing mechanism;

the diameter measuring mechanism and the moving measuring mechanism feed back detection signals to the control unit, and the control unit controls the action of the pushing mechanism.

In an optional embodiment, the diameter measuring mechanism comprises a first detecting component and a first movable component, the first movable component is movably connected with the machine body, an attaching part is arranged on the first movable component, a measuring position is arranged on the moving track of the attaching part, and when the attaching part is located at the measuring position, the attaching part can be attached to the syringe body of the syringe; the first detection assembly is used for detecting the displacement distance of the first movable assembly when the attaching portion moves towards the measuring position.

In an optional embodiment, the first detecting assembly includes a first detector and a first probe, the first movable assembly is fixedly connected to the first detector or the first probe, the attaching portion can drive the first probe and the first detector to move relatively when moving, and the first detector is configured to detect a displacement distance of the first probe relative to the first detector.

In an optional embodiment, the first detector includes a first detection surface extending along the movement direction of the joint portion and fixedly disposed, the first probe is fixedly connected to the first movable assembly, the first probe is jointed to the first detection surface, the first probe is movable along the first detection surface along with the joint portion, and the first detector is capable of detecting a displacement distance of the first probe on the first detection surface.

In an optional embodiment, the first movable assembly includes a connecting rod, the connecting rod is in sliding fit with the machine body, the attaching portion is fixedly connected with the connecting rod, and the first probe is fixedly connected with the attaching portion through the connecting rod.

In an optional embodiment, the first movable assembly further includes a reset member and a handheld portion, the reset member is used for driving the attaching portion to move to the measuring position, and the handheld portion is fixed to the attaching portion.

In an alternative embodiment, the movement measuring mechanism comprises a second detector and a second probe, the pushing mechanism is connected with the second probe or the second detector, the pushing mechanism is used for driving the second probe and the second detector to move relatively when being activated, and the second detector is used for detecting the displacement distance of the second probe relative to the second detector.

In an optional embodiment, the second detector includes a second detection surface extending along the movement direction of the pushing mechanism and fixedly disposed, the second probe is fixedly connected to the pushing mechanism, the second probe is attached to the second detection surface, the second probe is movable along the second detection surface along with the pushing mechanism, and the second detector is configured to detect a displacement distance of the second probe on the second detection surface.

In an optional embodiment, the pushing mechanism includes a movable rod and a clamp, the movable rod is fixedly connected with the clamp, the clamp is arranged on the movable rod, the clamp is used for clamping a push rod of the injector, the movable rod is in sliding fit with the body, and the second probe is fixedly connected with the movable rod.

According to a second aspect, the present application provides a method of injection comprising the steps of:

detecting the diameter of a syringe barrel and acquiring diameter information of the barrel;

detecting the displacement of the push rod of the injector in real time to acquire real-time displacement information of the push rod;

obtaining the real-time injection amount of the injector based on the diameter information and the displacement information;

if the injection amount is smaller than a set value, controlling the push rod to inject;

and if the injection amount is equal to a set value, controlling the push rod to stop injecting.

According to the injection device of the embodiment, the diameter of the barrel body of the injector and the movement amount of the pushing mechanism are detected, the pushing mechanism is connected with the push rod of the injector, so that the actual injection amount of the injector can be obtained, compared with the prior art, the injection control is performed by inputting the parameters of the injector in advance, and the movement amount of the push rod can be detected in real time, so that the injection amount can be more accurately obtained, and the condition that the liquid outlet amount of the injector is inaccurate due to environmental factors can be ignored.

According to the injection method of the embodiment, the diameter of the barrel of the injector is detected, the displacement of the push rod is detected in real time when the push rod of the injector is fed, and the injection amount of the push rod fed to the current position can be obtained through calculation according to a volume formula and based on the feeding amount of the push rod and the diameter of the barrel.

Drawings

FIG. 1 is a general schematic view of an injection device according to an embodiment of the present application;

FIG. 2 is a schematic view of the internal structure of an injection device according to an embodiment of the present application;

FIG. 3 is an enlarged schematic view of a diameter measuring mechanism according to an embodiment of the present application;

FIG. 4 is an exploded view of an injection device according to one embodiment of the present application;

fig. 5 is a schematic flow chart of an injection method according to an embodiment of the present application.

Reference numerals: the device comprises a body 1, a first detection assembly 21, a first detector 211, a first probe 212, a fitting part 221, a connecting rod 222, a handheld part 223, a reset piece 224, a first clamping piece 225, a movement measuring mechanism 31, a second detector 311, a second probe 312, a pushing mechanism 32, a movable rod 321, a clamp 322, a second clamping piece 3221, a triggering mechanism 3222, a linkage piece 323, a bayonet 3231, a second guide structure 324 and a driving mechanism 4.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments have been given like element numbers associated therewith. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The ordinal numbers used herein for the components, such as "first," "second," etc., are used merely to distinguish between the objects described, and do not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The present application discloses an injection device, as shown in fig. 1, which comprises a body 1, the body 1 has a mounting area for placing an injector, in an alternative embodiment, the body 1 may be a body 1 of an injection pump, and the body 1 is used for placing an injector.

A diameter measuring mechanism, a movement measuring mechanism 31 and a pushing mechanism 32 are respectively installed on the machine body 1, wherein when a syringe is placed in the installation area of the machine body 1, the diameter measuring mechanism is used for detecting the diameter of the barrel body of the syringe, and the movement measuring mechanism 31 is used for detecting the movement amount of the push rod of the syringe.

This application is through the stack shell diameter of real-time detection syringe and the amount of movement of the push rod of syringe, thereby based on the volume formula, just can real-time injection liquid volume of detection syringe, according to the injection liquid volume that calculates, in order to carry out accurate control to the push rod of syringe, compare in prior art, inject control through inputing the syringe parameter in advance, this application control is more accurate, and can accomplish real-time control, simultaneously under the condition of frequently changing the syringe, also need not to adjust injection parameter many times, and, immediately under the condition that mark scale existence error exists at syringe itself, the liquid volume is annotated in this application also can accurate control. To facilitate the description of the diameter measuring mechanism and the movement measuring mechanism 31 described above, the present application will be described in conjunction with specific embodiments disclosed below.

In an embodiment disclosed in the present application, the diameter measuring mechanism mainly includes a first detecting component 21 and a first movable component, wherein the first movable component is movably connected to the body 1, for example, a first guiding structure is installed on the body 1, the first movable component can be in sliding fit with the first guiding structure, so that the first movable component can move relative to the body 1, specifically, the first guiding structure can be a chute, a through hole or a guiding member opened on the body 1, when the syringe is placed on the body 1, an axial direction of the syringe is parallel to a plane where the body 1 is located, the first guiding structure can be a through hole perpendicular to the plane where the body 1 is located or other similar guiding structures, the first movable component is in sliding fit with the first guiding structure, so that the first movable component can move in a direction perpendicular to the body 1, a fitting portion 221 is provided on the first movable component, when the first movable component moves, the fitting portion 221 can be close to the initial position and a detection initial position, when the first movable component is placed on the body 1, the fitting portion 221 is close to the first detecting component, and a distance between the syringe is defined by the first movable component and the first movable component is defined as being close to the syringe.

For example, in a specific example provided in the present application, the attaching portion 221 of the first movable component is located on a side of the injector far from the body 1, before the injector is installed on the body 1, a position where the attaching portion 221 attaches to the body 1 may be marked as an initial position, then when the injector is placed on the body 1, the first movable component is driven to be far from the body 1, the injector is placed between the first movable component and the body 1, and then the first movable component is driven to attach to the barrel of the injector, at this time, the attaching portion 221 reaches the detection position, a displacement distance from the initial position of the first movable component is recorded, so as to obtain a diameter of the barrel of the injector, in addition, if the installation area provided on the body 1 is a non-planar structure, a distance between the installation area and the body may be subtracted or added when calculating the diameter, the above calculation process may be performed by a calculation module in the control unit, in addition, a position where the attaching portion 221 is farthest from the body may be marked as an initial position, which is not described herein too much.

It should be understood that the above-mentioned attaching portion 221 may not move perpendicular to the body 1, for example, the first moving component may also drive the attaching portion 221 to attach to the barrel of the syringe from above or below the syringe, and even in some possible designs, the attaching portion 221 may not move from the radial direction of the syringe to attach to the syringe, for example, when the moving direction of the attaching portion 221 has a certain included angle with the radial direction of the syringe, the included angle and the moving distance of the attaching portion 221 may also be combined, so as to calculate the moving distance of the attaching portion 221 in the radial direction of the syringe, thereby obtaining the diameter of the syringe.

The attaching portion 221 may include one or more attaching portions, when one attaching portion 221 is provided, the first movable member may attach the syringe barrel from one side, and when a plurality of attaching portions 221 are provided, the attaching portions 221 may attach the syringe barrel from multiple directions, and the diameters of the syringe barrels may be calculated by using the distances between the syringes and the respective displacement distances.

In a more specific example, the first detecting assembly 21 includes a first detector 211 and a first probe 212, the first movable assembly is configured to actuate the first probe 212 and the first detector 211 to move relatively when the first movable assembly is activated, the first detector 211 obtains a displacement distance of the first movable assembly through calculation by detecting a displacement of the first probe 212, for example, one of the first probe 212 and the first detector 211 may be connected to the first movable assembly, and the other one may be fixed, and when the first movable assembly is activated, the first probe 212 or the first detector 211 connected thereto may be driven to move so as to cause a relative displacement therebetween, thereby completing the detection.

In an alternative embodiment, as shown in fig. 2 and 3, the first displacement detecting assembly 21 includes an elongated first detector 211, one side of the first detector 211 serves as a first detecting surface, the first detecting surface extends toward the moving direction of the first movable assembly, for example, when the moving direction of the first movable assembly is perpendicular to the plane of the body 1, the first detecting surface is also perpendicular to the plane of the body 1, the first probe 212 is attached to the first detecting surface, considering that the volume and weight of the first probe 212 are generally smaller than those of the first detector 211, therefore, in a common example, the first probe 212 is fixedly connected to the first movable assembly, the first probe 212 can move along the first detecting surface along with the first movable assembly, specifically, as shown in fig. 2 and 3, the first movable assembly includes a connecting rod 222 besides the attaching portion 221, wherein the connecting rod 222 is slidably engaged with the body 1 through a first guiding structure, the connecting rod 221 is fixedly installed at one end of the connecting rod 222, the connecting rod 221 is attached to the body 1 through the connecting rod 221, and the connecting rod 222 is attached to the body 1 through the body 1. The first probe 212 is fixedly connected to the connecting rod 222, as shown in fig. 3, a first clamping piece 225 is fixed to one end of the connecting rod 222 away from the attaching portion 221, and the first probe 212 is engaged with the first clamping piece 225 and contacts with the first detection surface. The first probe 212 is moved on the first detection surface, so that the positional distance of the first probe 212 can be measured. First detecting element 21 can be the potential ruler, magnetic grid chi, similar displacement detection volume device such as grating chi, the potential ruler, magnetic grid chi, grating chi are prior art, this application does not expand the detailed description to this first detecting element 21's theory of operation, explain for the exemplary of potential ruler to first detecting element 21, when first detecting element 21 is the potential chi, first probe 212 and first detector 211 all are connected with the electrode, this first detector 211 is the resistance, first probe 212 is when the different positions of first detection face, the length that the electric current passes through first detector 211 is different, at this moment, the resistance value that detects can change to just can judge the position of first probe 212 based on the resistance value.

In addition, in the above embodiment, in order to facilitate the movement of the first movable component, the attaching portion 221 may further have a holding portion 223 fixed thereon, for example, the holding portion 223 may be a hook structure, the hook structure may be disposed on a side of the attaching portion 221 away from the machine body 1, and the attaching portion 221 and the connecting rod 222 may be operated to move by hooking a finger on the hook, it should be understood that the holding portion 223 is not limited to a hook shape, and may also be other shapes convenient for holding, and the present application is not limited in particular.

In addition, in some embodiments, the first movable assembly further includes a resetting member 224, the resetting member 224 is configured to drive the attaching portion 221 to move to the detection position, that is, when the injector is placed on the body 1, the resetting member 224 is configured to drive the attaching portion 221 to attach to the barrel of the injector, for example, in an example where the attaching portion 221 moves perpendicular to the body 1 to attach to the barrel of the injector, the resetting member 224 may be an elastic member, one end of the elastic member is fixedly disposed, and the other end of the elastic member is configured to push the first movable assembly to approach the body 1, so that the attaching portion 221 attaches to the barrel of the injector.

For example, in the embodiment that the first movable component is composed of the attaching portion 221 and the connecting rod 222, the attaching portion 221 may be disposed at one end of the injector far from the body 1, and the connecting rod 222 is fixedly connected to the probe, at this time, the elastic member may be a spring sleeved on the connecting rod 222, one end of the spring is fixedly connected to the body 1, and the other end of the spring may be connected to the first probe 212, when the attaching portion 221 is attached to the body 1, the spring is in a natural state, when the injector needs to be installed, the attaching portion 221 may be pulled toward a direction far from the base, and then the barrel of the injector is placed between the attaching portion 221 and the body 1, at this time, the spring is in an extended state, and then the attaching portion 221 is released, and the attaching portion 221 may move toward the body 1 under the driving of the spring, so as to attach to the barrel of the injector located on the body 1.

In one embodiment disclosed herein, the pushing mechanism 32 is movably connected to the body 1, and similar to the first movable component, in a specific example, a second guiding structure 324 cooperating with the pushing mechanism 32 may be disposed on the body 1, and the pushing mechanism 32 is slidably engaged with the corresponding second guiding structure 324, so as to realize the movable connection with the body 1, for example, as shown in fig. 4, the second guiding structure 324 cooperating with the pushing mechanism 32 is a guide rod parallel to the syringe on the body 1, and the second movable component is slidably engaged with the guide rod, when the syringe is placed on the body 1, the pushing mechanism 32 can move together with the push rod of the syringe, in an example, by detachably and fixedly connecting the pushing mechanism 32 with the push rod, so that the pushing mechanism 32 and the push rod can move synchronously when connected. The pushing mechanism 32 pushes the pushing rod to move so as to realize liquid injection, and the movement measuring mechanism 31 is used for detecting the displacement distance of the pushing mechanism 32.

As shown in fig. 4, a more specific example is shown by way of example, in this example, the pushing mechanism 32 includes a movable rod 321, one end of the movable rod 321 is provided with a clamp 322, the clamp 322 is used for fixing the end of the pushing rod far away from the syringe barrel, for example, one side of the clamp 322 facing the pushing rod is provided with two second clamping pieces 3221 which can be close to or far away from each other, and the second clamping pieces 3221 can be driven by a power source such as a motor to make the two close to or far away from each other. In a specific working process, one end of the push rod of the syringe, which is far away from the syringe barrel, is placed between the two second clamping pieces 3221, and then the two second clamping pieces 3221 are driven to approach each other, so as to clamp the end of the push rod, in addition, in order to better control the actions of the two second clamping pieces 3221, a triggering mechanism 3222 may be further disposed between the two second clamping pieces 3221, when the end of the push rod is placed between the two second clamping pieces 3221, the triggering mechanism 3222 may be a push switch, an infrared detection mechanism, and the like, which is not limited in this application.

When the push rod moves, the movement measuring mechanism 31 can detect the movement distance of the push rod in real time, so that the injection amount can be obtained in real time by matching the diameter of the syringe barrel moved by the first detecting component 21. The movement of the pushing mechanism 32 can be driven by the driving mechanism 4 such as an air cylinder, a hydraulic cylinder or a screw motor, etc., and the application is not limited too much.

In one embodiment, as shown in fig. 2 and 4, the moving measurement mechanism 31 includes a second detector 311 and a second probe 312, the pushing mechanism 32 is used for driving the second probe 312 and the second detector 311 to move relatively when moving, for example, the pushing mechanism 32 may also be connected to one of the second probe 312 and the second detector 311, and the other is fixed to the machine body 1, the second detector 311 is used for detecting the displacement distance of the second probe 312, so as to be able to obtain the displacement distance of the pushing mechanism 32, similar to the first detection assembly 21, the moving measurement mechanism 31 may also be a detector such as a potential ruler, a magnetic grid ruler, a grating ruler, etc., in a specific example, as shown in fig. 4, the second detector 311 includes a second detection surface extending along the moving direction of the pushing mechanism 32, the second detector 311 is disposed above the pushing mechanism 32, the bottom surface of the second detector 311 is a second detection surface, the second detection surface extends along the axial direction of the injector, a linking member 323 is disposed at one end of the movable rod 321 of the pushing mechanism 32 away from the clamp 322, the linking member 323 is in sliding fit with the second guiding structure 324, for example, when the second guiding structure 324 is a guide rod, the linking member 323 is slidably sleeved outside the guide rod, a bayonet 3231 is disposed at the top of the linking member 323, the bottom of the second probe 312 is engaged in the bayonet 3231, the upper end of the second probe 312 is attached to the second detection surface, when the movable rod 321 moves along with the push rod, the linking member 323 can be driven to move, and the second probe 312 on the linking member 323 can be driven to move along the second detection surface, so as to measure the moving amount of the push rod.

It should be understood that the present application further includes one or more control units, which may be separate control devices, or may be one or more control units built in the diameter measuring mechanism, the movement measuring mechanism, and the pushing mechanism 32, wherein the diameter measuring mechanism, the movement measuring mechanism, and the pushing mechanism 32 are all electrically connected to the corresponding control units, and the control units are used for receiving the diameter measuring mechanism and the movement measuring mechanism, and controlling the pushing mechanism 32 to operate.

The specific work flow of the present application is shown in fig. 5:

placing the injector in the installation area of the machine body 1, and then sliding the joint part 211 to joint the injector with the machine body 1, so as to detect the displacement distance of the joint part 211 through a diameter measuring mechanism and obtain the diameter information of the injector cylinder body;

the pushing mechanism 32 is controlled to drive the push rod of the injector to move, and the displacement distance of the push rod along the push rod of the injector is detected in real time through the movement measuring mechanism 31, so that the real-time displacement information of the push rod is obtained.

Based on the diameter information of the barrel body and the displacement information of the push rod, the real-time injection amount of the injector can be calculated by utilizing a calculation module in the control unit and substituting the diameter information and the displacement information through a volume formula of the cylinder.

At this time, the magnitude between the injection amount and the set value is judged:

if the injection amount is smaller than the set value, the pushing mechanism 32 continues to push the push rod along the axial direction of the injector for injection; if the injection amount is equal to the set value, the pushing mechanism 32 is controlled to stop, and the push rod stops injecting.

This application can be accurate control syringe annotate the liquid precision, and this application is applicable to automatic injection equipment such as syringe pump, injection station, compares in current automatic injection equipment, and this application can also be accurate control annotate the liquid precision under the condition of not inputing the syringe parameter in advance, and compares in current automatic injection equipment, can reduce or even avoid because the scale error of syringe and the notes liquid error that leads to.

The present invention has been described in terms of specific examples, which are provided to aid in understanding the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (10)

1. An injection device, comprising:

the injection device comprises a body, a first connecting piece and a second connecting piece, wherein the body is provided with an installation area for placing an injector;

a diameter measuring mechanism for detecting a diameter of a barrel of a syringe when the syringe is placed within the mounting region;

the pushing mechanism is used for pushing a push rod of the injector in the mounting area so as to realize injection;

the movement measuring mechanism is connected with the pushing mechanism and is used for measuring the movement amount of the pushing mechanism;

the diameter measuring mechanism and the moving measuring mechanism feed back detection signals to the control unit, and the control unit controls the action of the pushing mechanism.

2. The injection device according to claim 1, wherein the diameter measuring mechanism comprises a first detecting component and a first movable component, the first movable component is movably connected with the body, the first movable component is provided with a fitting part, the movement track of the fitting part is provided with a measuring position, and when the fitting part is positioned at the measuring position, the fitting part can be fitted with the syringe barrel; the first detection assembly is used for detecting the displacement distance of the first movable assembly when the attaching portion moves to the measuring position.

3. The injection device as claimed in claim 2, wherein the first detection assembly comprises a first detector and a first probe, the first movable assembly is fixedly connected with the first detector or the first probe, the fitting portion can drive the first probe and the first detector to move relatively when moving, and the first detector is used for detecting a displacement distance of the first probe relative to the first detector.

4. The injection device as set forth in claim 3, wherein the first detector includes a first detecting surface extending along the moving direction of the engaging portion and fixedly disposed thereon, the first probe is fixedly connected to the first movable assembly, the first probe is engaged with the first detecting surface, the first probe is movable along the first detecting surface along with the engaging portion, and the first detector is capable of detecting the displacement distance of the first probe on the first detecting surface.

5. The injection device as defined in claim 4, wherein said first movable assembly includes a connecting rod, said connecting rod is slidably engaged with said body, said engagement portion is fixedly connected with said connecting rod, and said first probe is fixedly connected with said engagement portion through said connecting rod.

6. The injection device as set forth in any one of claims 2 to 5, wherein the first movable assembly further comprises a reset member for driving the abutting portion to the measuring position and a hand-held portion fixed to the abutting portion.

7. The injection device as defined in claim 1, wherein said movement measuring mechanism includes a second detector and a second probe, said pushing mechanism being connected to said second probe or said second detector, said pushing mechanism being adapted to actuate a relative movement of said second probe and said second detector when activated, said second detector being adapted to detect a displacement distance of said second probe relative to said second detector.

8. The injection device as set forth in claim 7, wherein the second detector includes a second detection surface extending along the moving direction of the pushing mechanism and fixedly disposed thereon, the second probe is fixedly connected to the pushing mechanism, the second probe is attached to the second detection surface, the second probe is movable along the second detection surface along with the pushing mechanism, and the second detector is configured to detect a displacement distance of the second probe on the second detection surface.

9. The injection device as defined in claim 7, wherein said pushing mechanism includes a movable rod and a clamp, said movable rod is fixedly connected with said clamp, said clamp is disposed on said movable rod, said clamp is used for clamping the push rod of the injector, said movable rod is slidably engaged with the body, and said second probe is fixedly connected with said movable rod.

10. An injection method, comprising the steps of:

detecting the diameter of a syringe barrel and acquiring the diameter information of the barrel;

detecting the displacement of the push rod of the injector in real time to acquire real-time displacement information of the push rod;

obtaining real-time injection amount of the injector based on the diameter information and the displacement information;

if the injection amount is smaller than a set value, controlling the push rod to inject;

and if the injection amount is equal to a set value, controlling the push rod to stop injecting.

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