CN118949197A - syringe - Google Patents
syringe Download PDFInfo
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- CN118949197A CN118949197A CN202411049538.1A CN202411049538A CN118949197A CN 118949197 A CN118949197 A CN 118949197A CN 202411049538 A CN202411049538 A CN 202411049538A CN 118949197 A CN118949197 A CN 118949197A
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- Prior art keywords
- push rod
- sleeve
- friction
- rod mechanism
- positioning
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/3129—Syringe barrels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/332—Force measuring means
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- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
本发明涉及医疗器械领域，具体是注射器，包括空筒、活塞和推杆机构；活塞和空筒之间的摩擦力被定义为第一摩擦力；推杆机构被配置为可伸缩的套筒结构，推杆机构被配置为整体的插入至空筒内，推杆机构与空筒被限制为可活动且不可分离的连接结构，推杆机构内设置有螺旋弹簧，具有螺旋弹簧的推杆机构作为动力源，并且将推杆机构施加到活塞的驱动力与活塞和空筒之间的第一摩擦力的差值配置为净动力阈值，使得推杆机构在推动活塞相对于空筒的运动过程中，可以使得活塞相对于空筒形成近似匀速直线运动的效果，可以减少医护人员的工作强度；相对于现有技术提高了注射效率；重量更轻、更佳方便携带，可以进行消毒处理，降低了注射器的经济成本。
The present invention relates to the field of medical devices, in particular to a syringe, comprising an empty barrel, a piston and a push rod mechanism; the friction force between the piston and the empty barrel is defined as a first friction force; the push rod mechanism is configured as a retractable sleeve structure, the push rod mechanism is configured to be inserted into the empty barrel as a whole, the push rod mechanism and the empty barrel are restricted to a movable and inseparable connection structure, a spiral spring is arranged in the push rod mechanism, the push rod mechanism with the spiral spring is used as a power source, and the difference between the driving force applied to the piston by the push rod mechanism and the first friction force between the piston and the empty barrel is configured as a net power threshold, so that in the process of pushing the piston relative to the empty barrel, the push rod mechanism can make the piston form an effect of approximately uniform linear motion relative to the empty barrel, which can reduce the work intensity of medical staff; the injection efficiency is improved compared with the prior art; the weight is lighter, more convenient to carry, can be sterilized, and the economic cost of the syringe is reduced.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to an injector.
Background
In the prior art, there is also provided a patent document with a name of intravenous injector, and an application number of 201420404003.7; in the patent document, a valve ball is arranged in a needle seat of an injection needle connected with an injector, and the purpose of controlling the injection speed of the injector is achieved through a gap between the valve ball and the needle seat, wherein when the injection speed is too high, the valve ball blocks the needle seat, and when the injection speed is reasonable, a gap is formed between the valve ball and the needle seat for passing liquid medicine.
As known from the prior art described above, the injection speed of the syringe needs to be controlled during intravenous injection; in the above-described conventional art, the speed is controlled by using a manual operation as a power source and disposing a valve-like structure having a valve ball inside the injection needle.
In the prior art, a patent document with the application number 201620184707.7 is also provided, wherein the name of the patent document is an intravenous injector; in this patent document, a syringe using a motor as a power source is specifically used to replace a syringe manually operated as a power source; however, in practical applications, such a syringe with a motor is inconvenient to use, on one hand, the syringe with a motor is relatively heavy due to various structures such as a battery and a controller, and is inconvenient to carry, which makes the syringe with a motor limited in application, and on the other hand, the syringe with a motor is difficult to use in a proper sterilization mode due to the need of sterilization treatment for medical devices, which causes inconvenience in sterilization, and if the syringe with a motor is directly discarded, the economic cost of the syringe is increased.
Therefore, how to provide an intravenous injector which is not electrically controlled and is used for controlling the injection speed in the intravenous injection process is a technical problem to be solved.
Disclosure of Invention
The invention provides an injector, which aims at solving the technical problem of how to provide an intravenous injector adopting non-electric control for controlling the injection speed in the intravenous injection process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
according to one aspect of the present invention there is provided a syringe comprising a barrel, a piston and a push rod mechanism;
the piston is arranged in the hollow cylinder, and the friction force between the piston and the hollow cylinder is defined as a first friction force;
the push rod mechanism is configured into a telescopic sleeve structure, the push rod mechanism is configured to be integrally inserted into the hollow cylinder, the push rod mechanism and the hollow cylinder are limited into a movable and inseparable connecting structure, the piston is fixedly arranged at the end part of the push rod mechanism positioned in the hollow cylinder, a spiral spring is arranged in the push rod mechanism, the push rod mechanism is provided with a contracted state and a relaxed state, when the spiral spring drives the push rod mechanism to change from the contracted state to the relaxed state, the acting force of the push rod mechanism for driving the piston is defined as a driving force, the driving force is configured to be larger than the first friction force, and the difference value between the driving force and the first friction force meets a net power threshold;
the push rod mechanism is further configured with a locking structure for controlling the transition of the push rod mechanism from the contracted state to the relaxed state, wherein the locking structure is constrained within the profile of the push rod mechanism.
Further, the hollow cylinder is provided with a handle part and a nipple, the hollow cylinder between the handle part and the nipple is defined as a first cylinder section, the hollow cylinder outside the handle part and the nipple is defined as a second cylinder section, and external threads are arranged on the second cylinder section;
The locking nut is provided with a positioning ring and a connecting sleeve with internal threads, the positioning ring and the connecting sleeve are coaxially and integrally manufactured, and the inner diameter of the positioning ring is smaller than that of the connecting sleeve;
The push rod mechanism is provided with a positioning convex ring, and the positioning convex ring is in clearance fit with the inner wall of the hollow cylinder;
The external thread of the second barrel section, the positioning convex ring of the push rod mechanism and the lock nut limit the push rod structure and the hollow barrel to be movable and inseparable connection structures, wherein the internal thread of the lock nut is connected with the external thread of the second barrel section, and the movable path of the positioning convex ring is limited between the positioning ring and the inner wall of the hollow barrel.
Further, the push rod mechanism is also provided with a detachable push handle;
The lock nut is sleeved on the push rod mechanism between the push handle and the positioning convex ring, and the lock nut and the push rod mechanism between the push handle and the positioning convex ring form clearance fit, wherein the radial maximum length of the push handle is larger than the inner diameter of the positioning ring.
Further, the push rod mechanism is also provided with a first sleeve and a second sleeve;
The first sleeve and the second sleeve form the telescopic sleeve structure, wherein the second sleeve is inserted into the first sleeve;
The axial both ends of first sleeve are head end and terminal respectively, the location bulge loop is located head end department first sleeve's outer circumference surface is located the tail end department, push away the handle, just push away the handle with first sleeve detachable is connected.
Further, the push rod mechanism is also provided with a friction component;
the spiral spring and the friction assembly are respectively arranged inside the outline of the telescopic sleeve structure, wherein the spiral spring and the friction assembly are in a mutually separated state;
The friction force between the friction assembly and the second sleeve is defined as a second friction force, and the elastic force of the spiral spring acts on the second sleeve and the first sleeve along the expansion and contraction directions of the first sleeve and the second sleeve respectively;
the difference between the elasticity of the spiral spring and the second friction force is the driving force, and the elasticity of the spiral spring is larger than the second friction force.
Further, the friction assembly comprises a positioning block, a positioning pin and a plurality of friction blocks;
the positioning block is positioned at one end of the positioning pin, and the positioning block is fixedly connected or detachably connected with the positioning pin;
The friction blocks are positioned at the other end of the positioning pin and are detachably connected with the positioning pin, any one of the friction blocks is configured into a deformable structure, and the diameter of the former friction block is smaller than that of the latter friction block along the direction from the positioning pin to the positioning block;
the second sleeve is provided with a conical friction cavity, an opening of the friction cavity faces the pushing handle, the distance from the bottom of the friction cavity to the pushing handle is larger than the distance from the opening of the friction cavity to the pushing handle, and the inner diameter of the friction cavity at the opening is larger than the inner diameter of the friction cavity at the bottom of the cavity;
The plurality of friction blocks are inserted into the friction cavity, the positioning block is located outside the friction cavity, wherein the positioning block is limited between the spiral spring and the pushing handle, and the elastic force of the spiral spring is applied to the first sleeve through the positioning block and the pushing handle.
Further, a telescopic cavity is further arranged in the second sleeve, and the telescopic cavity and the friction cavity are configured to be coaxial and isolated from each other, wherein the friction cavity is positioned in the telescopic cavity;
the positioning block is positioned outside the telescopic cavity;
The coil spring is limited in the space between the positioning block and the telescopic cavity, and the coil spring surrounds the friction cavity.
Further, the second sleeve is also provided with an end plate;
the two axial ends of the second sleeve are respectively a head end and a tail end, wherein the end plate is positioned at the head end, and the opening of the friction cavity and the opening of the telescopic cavity are respectively positioned at the tail end;
The piston is coaxially arranged on the end plate, wherein the end plate and the inner wall of the hollow cylinder form clearance fit.
Further, a locking pin is arranged on the inner surface of the first sleeve, and protrudes out of the inner surface of the first sleeve;
the outer surface of the second sleeve is provided with a guide groove and a locking groove, and the guide groove and the locking groove are respectively recessed in the outer surface of the second sleeve;
the extending direction of the guide groove is configured as the axial line direction of the second sleeve, the extending direction of the locking groove is configured as the circumferential direction of the second sleeve, and the guide groove is communicated with the locking groove;
The movable path of the locking pin is limited in the guide groove and the locking groove, wherein the push rod mechanism is in the contracted state when the locking pin is positioned in the locking groove, and the push rod mechanism is shifted from the contracted state to the relaxed state when the locking pin moves from the locking groove into the guide groove.
Further, the net power threshold is specifically a net power upper limit value, a net power lower limit value, and a net power value between the net power upper limit value and the net power lower limit value. The technical scheme has the following advantages or beneficial effects:
The spiral spring is arranged in the push rod mechanism, the push rod mechanism with the spiral spring is used as a power source, and the difference value of the driving force applied to the piston by the push rod mechanism and the first friction force between the piston and the hollow cylinder is configured as a net power threshold value, so that the push rod mechanism can enable the piston to move at a uniform speed and in a straight line relative to the hollow cylinder in the process of pushing the piston to move relative to the hollow cylinder, and the working intensity of medical staff can be reduced; compared with the prior art, the injection efficiency is improved; the weight is lighter, better portable can carry, can carry out disinfection treatment, has reduced the economic cost of syringe.
Drawings
Fig. 1 is a schematic structural view of a syringe according to embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view of a syringe according to embodiment 1 of the present invention;
FIG. 3 is a cross-sectional view of a portion of a syringe according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a lock nut according to embodiment 1 of the present invention;
Fig. 5 is a schematic structural diagram of a hollow cylinder according to embodiment 1 of the present invention;
FIG. 6 is a cross-sectional view of a syringe according to embodiment 1 of the present invention;
FIG. 7 is a cross-sectional view of a syringe according to embodiment 1 of the present invention;
FIG. 8 is a cross-sectional view of a syringe according to embodiment 1 of the present invention;
FIG. 9 is a schematic view of a friction assembly according to embodiment 1 of the present invention;
fig. 10 is a schematic structural view of a first sleeve and a push handle according to embodiment 1 of the present invention;
FIG. 11 is a schematic view of a second sleeve and piston according to embodiment 1 of the present invention;
Fig. 12 is a schematic structural diagram of a first sleeve, a second sleeve and a piston according to embodiment 1 of the present invention;
FIG. 13 is a cross-sectional view of the first sleeve, second sleeve and piston provided in embodiment 1 of the present invention;
Fig. 14 is a schematic structural view of a second sleeve, a piston and a push handle according to embodiment 1 of the present invention.
Detailed Description
Example 1:
in this embodiment, an injector is provided to solve the technical problem of how to provide an intravenous injector which adopts non-electric control and is used for controlling the injection speed in the intravenous injection process.
Specifically, referring to fig. 1 or 2, the syringe of the present embodiment includes a hollow cylinder 1, a piston 2, and a push rod mechanism 3;
the piston 2 is arranged in the hollow cylinder 1, and the friction force between the piston 2 and the hollow cylinder 1 is defined as a first friction force;
The push rod mechanism 3 is configured as a telescopic sleeve structure, the push rod mechanism 3 is configured as a whole to be inserted into the hollow cylinder 1, the push rod mechanism 3 and the hollow cylinder 1 are limited to be in a movable and inseparable connection structure, the piston 2 is fixedly arranged at the end part of the push rod mechanism 3 positioned in the hollow cylinder 1, wherein a spiral spring 301 is arranged in the push rod mechanism 3, the push rod mechanism 3 has a contracted state and a relaxed state, when the spiral spring 301 drives the push rod mechanism 3 to change from the contracted state to the relaxed state, the acting force of the push rod mechanism 3 for driving the piston 2 is defined as a driving force, the driving force is configured to be larger than a first friction force, and the difference between the driving force and the first friction force meets a net power threshold;
the push rod mechanism 3 is further provided with a locking structure 390, the locking structure 390 being adapted to control the transition of the push rod mechanism 3 from the contracted state to the relaxed state, wherein the locking structure is confined within the contour of the push rod mechanism 3.
In this embodiment, the hollow cylinder 1 is used for storing a liquid medicine;
In the embodiment, a piston 2 is arranged in an empty cylinder 1; when a worker operates the injector of the embodiment, the whole push rod mechanism 3 can be pushed or pulled manually according to the operation mode of a common injector in the prior art, so that the whole push rod mechanism 3 pushes or pulls the piston 2, and the piston 2 performs pushing action of injecting liquid medicine or retreating action of drawing the liquid medicine in the empty cylinder 1; in addition, in this embodiment, the push rod mechanism 3 has another control method, which will be described later.
In the present embodiment, the push rod mechanism 3 is configured as a telescopic sleeve structure, specifically, the lengths of both axial ends of the push rod mechanism 3 are changeable, see fig. 2, 7 or 8, and therefore, the push rod mechanism 3 has a contracted state and a relaxed state, wherein the contracted state refers to a state when the lengths of both axial ends of the push rod mechanism 3 are limited to a minimum length (see fig. 2), and the relaxed state refers to a state in which the lengths of both axial ends of the push rod mechanism 3 are shifted from the minimum length to a maximum length (see fig. 7 or 8).
In this embodiment, the whole push rod mechanism 3 and the hollow cylinder 1 form a sliding pair, the push rod mechanism 3 can be inserted into the hole (see fig. 6), and the whole push rod mechanism 3 can push or pull the piston 2; meanwhile, the whole push rod mechanism 3 and the hollow cylinder 1 form a movable and inseparable connecting structure, so that the whole push rod mechanism 3 cannot be separated from the hollow cylinder 1; based on the telescopic sleeve structure of the push rod mechanism 3, the power source is the elasticity of the spiral spring 301 positioned in the push rod mechanism 3, so that the push rod mechanism 3 can apply driving force to the piston 2 in the hollow cylinder 1 in the process that the length of the push rod mechanism 3 at two axial ends continuously grows due to the fact that the push rod mechanism 3 is inseparable from the hollow cylinder 1 in the process that the push rod mechanism 3 is converted from a contracted state to a relaxed state;
In addition, in the embodiment, since the driving force of the push rod mechanism 3 driving the piston 2 is greater than the first friction force formed between the piston 2 and the hollow cylinder 1, the piston 2 is ensured to be capable of performing the pushing action of the injection liquid medicine, wherein the direction of the driving force received by the piston 2 is a first direction a, the direction of the first friction force between the piston 2 and the hollow cylinder 1 is a second direction B, the first direction a and the second direction B are opposite to each other, and in terms of changing angles, the first friction force is one of the resistances in the moving process of the piston 2 (the first friction force refers to the pushing action process of the injection liquid medicine here);
It should be understood that during the movement of the piston 2 (referred to herein as the pushing action of the injected liquid medicine), the piston 2 is subjected to a resistance of the liquid medicine in the hollow cylinder 1 in addition to a resistance of the first friction force.
It should be understood that the driving force of the push rod mechanism 3 driving the piston 2 is not equal to the elastic force of the coil spring 301 located in the push rod mechanism 3; in the following, a definition of driving force is specifically proposed, which is not mentioned here.
In order to avoid the push rod mechanism 3 automatically driving the piston 2 to push the injection liquid medicine, the injector in the embodiment is further provided with a locking structure 390 on the push rod mechanism 3; specifically, when the push rod mechanism 3 is locked by the locking structure 390, the push rod mechanism 3 is in the contracted state as a whole, and the push rod mechanism 3 cannot apply a driving force to the piston 2 at this time, because the locking structure 390 restricts the telescopic action of the push rod mechanism 3, when the push rod mechanism 3 is unlocked, the push rod mechanism 3 is shifted from the contracted state to the relaxed state, and the push rod mechanism 3 at this time applies a driving force to the piston 2, and the locking mechanism at this time has failed to restrict the telescopic action of the push rod mechanism 3.
In the operation process of using the injector in the present embodiment, the medical staff can operate in the following two ways:
The first operation mode is manual operation; specifically, referring to fig. 2 or 6, the locking structure 390 cannot be unlocked by a medical staff, so that the medical staff uses the syringe of the present embodiment as a common syringe in the prior art, including pulling the whole push rod mechanism 3 when drawing the liquid medicine, so that the inner cavity between the piston 2 and the hollow cylinder 1 generates negative pressure to draw the liquid medicine, and pushing the whole push rod mechanism 3 after drawing the liquid medicine, so that the inner cavity between the piston 2 and the hollow cylinder 1 generates positive pressure to discharge the liquid medicine.
A second mode of operation, intravenous injection operation; specifically, referring to fig. 2, 7 or 8, the locking structure 390 cannot be unlocked by a medical staff in the process of drawing the liquid medicine, and after the liquid medicine is drawn, the locking structure 390 is unlocked by the staff, and the elastic force of the coil spring 301 at least overcomes the first friction force and the resistance of the liquid medicine, so that the piston 2 is driven by the driving force of the push rod mechanism 3 to achieve the intravenous injection operation of automatically injecting the liquid medicine.
In the syringe of the present embodiment, in order to maintain the injection speed of the injection liquid medicine at a constant speed, the driving force applied to the piston 2 by the push rod mechanism 3 and the first friction force of the piston 2 are configured as follows: on the one hand, the driving force is greater than the first friction force, and on the other hand, the difference between the driving force and the first friction force is limited within a net power threshold; the idea of controlling the speed of injecting the liquid medicine (the flow rate of the liquid medicine) in the prior art is changed into the idea of controlling the speed of the piston 2 (the movement speed of the piston 2 relative to the hollow cylinder 1) in the embodiment, and then the idea of controlling the speed of the piston 2 is implemented according to the technical scheme of controlling the stress of the piston 2, wherein the stress is the difference between the driving force and the first friction force, and the range of the difference between the driving force and the first friction force is limited;
since the first frictional force between the piston 2 and the hollow cylinder 1 is unchanged and the resistance force formed by the liquid medicine and the hollow cylinder 1 cannot be controlled (the viscosity of the liquid medicine is different), the range of the difference between the driving force and the first frictional force is limited, and the magnitude of the variation of the driving force is actually limited.
The driving force applied to the piston 2 at the previous timing is greater than the driving force applied to the piston 2 at the subsequent timing, and the movement speed of the piston 2 is in a speed-up state;
the driving force applied to the piston 2 at the previous timing is smaller than the driving force applied to the piston 2 at the subsequent timing, and the movement speed of the piston 2 is in a decelerating state;
According to the above-described time-varying relationship between the driving force and the movement speed of the piston 2, the following two test models can be configured;
The first test model is to set the resistance formed by the liquid medicine and the empty cylinder 1 as an ideal value, and only measure the variation of the driving force by taking the first friction force as a resistance parameter;
In the second test model, the resistance formed by the liquid medicine and the hollow cylinder 1 and the first friction force are taken as resistance parameters together, and the variation of the driving force is measured.
The technical means for measuring the driving force may be a measurement means of the prior art, such as: the cylinder is matched with a measuring tool (positioning device), a force measuring instrument and a push rod are arranged between a piston 2 of the cylinder and the piston 2 in the hollow cylinder 1, the force measuring instrument and the push rod are respectively movably positioned with the measuring tool, the hollow cylinder 1 and the cylinder are fixedly positioned relative to the measuring tool, the linear movement speed of the force measuring instrument and the push rod is controlled by the cylinder to keep linear uniform movement, so that the piston 2 can form linear uniform movement relative to the hollow cylinder 1, at the moment, the numerical value of the driving force applied to the piston 2 in the hollow cylinder 1 can be obtained by reading the data of the force measuring instrument, more specifically, the numerical values of a plurality of driving forces are different in numerical value of the driving force.
The above measurement method can be applied to the above two test models.
After the values of the driving forces are obtained by the measuring means, respectively obtaining the difference value between any one of the values of the driving forces and the first friction force to obtain the net power threshold value, wherein the net power threshold value has a net power upper limit value, a net power lower limit value and a net power value between the net power upper limit value and the net power lower limit value;
If the first test model is used, the upper limit value of the net power is actually the difference value between the maximum value of the driving force obtained by the measuring means and the first friction force, and the lower limit value of the net power is actually the difference value between the minimum value of the driving force obtained by the measuring means and the first friction force; the rest net power values are the difference between the obtained driving force value and the first friction force by adopting the measuring means.
If the second test model is adopted, the upper limit value of the net power is actually the difference value between the maximum value of the obtained driving force and the sum of the first friction force and the resistance of the liquid medicine in the empty cylinder 1 by adopting the measuring means, and the lower limit value of the net power is actually the difference value between the minimum value of the obtained driving force and the sum of the first friction force and the resistance of the liquid medicine in the empty cylinder 1 by adopting the measuring means; the rest net power values are the difference between the value of the driving force obtained by the measuring means and the sum of the first friction force and the resistance of the liquid medicine in the empty cylinder 1.
In the process of actually setting the driving force of the embodiment, the speed change of the piston 2 in the hollow cylinder 1 can be regarded as uniform motion as long as the driving force is limited within the above-mentioned net power threshold; in another aspect, the change in the speed of injection of the medical fluid caused by the limitation of the magnitude of the driving force to within the net power threshold is small and affordable to the patient.
In the prior art (an intravenous injector, application number is 201420404003.7), when the force applied to the intravenous injector by the hand of a medical staff is excessive, the valve cavity of the intravenous injector blocks the injection needle, so that the speed of the injection liquid medicine of the injector becomes zero, the injection speed of the injector is difficult to maintain at a constant speed, and the injection efficiency is reduced;
Compared with the prior art, the injector of the embodiment adopts the push rod mechanism 3 which is configured into a telescopic sleeve structure, and the spiral spring 301 is arranged in the push rod mechanism 3, so that the push rod mechanism 3 with the spiral spring 301 is used as a power source for injecting liquid medicine, replaces the manual power source in the prior art, and can reduce the working intensity of medical staff; then, the difference between the driving force exerted by the push rod mechanism 3 on the piston 2 and the first friction force of the piston 2 relative to the hollow cylinder 1 meets a net power threshold, so that the push rod mechanism 3 can enable the piston 2 to form an approximately uniform linear motion effect relative to the hollow cylinder 1 in the process of pushing the piston 2 relative to the hollow cylinder 1, and the injection efficiency is improved relative to the prior art; then, the push rod mechanism 3 of the present embodiment is further provided with a locking structure 390, so that the medical staff can control the syringe of the present embodiment to perform the injection of the medical fluid according to the manual operation or according to the automatic intravenous injection, so that the syringe of the present embodiment is more convenient and flexible to use.
In the prior art (a venous injector, application number is 201620184707.7), a motor is adopted as a power source and used for replacing a manual power source to control the injector, so that the effect of injecting liquid medicine at a uniform speed is realized.
Compared with the prior art, the embodiment adopts a mechanical structure configured as a telescopic push rod mechanism 3, the push rod mechanism 3 is internally provided with a spiral spring 301, the push rod mechanism 3 with the spiral spring 301 is used as a power source, and the difference value between the driving force applied by the push rod mechanism 3 to the piston 2 and the first friction force between the piston 2 and the hollow cylinder 1 is configured as a net power threshold value, so that the push rod mechanism 3 can enable the piston 2 to form an approximately uniform linear motion effect relative to the hollow cylinder 1 in the process of pushing the piston 2 to move relative to the hollow cylinder 1.
Therefore, the injector provided by the embodiment solves the technical problem of how to provide an intravenous injector which adopts non-electric control and is used for controlling the injection speed in the intravenous injection process.
Further, on the basis of the foregoing solution, how to limit the push rod mechanism 3 and the hollow cylinder 1 to a movable and non-separable connection structure is preferably implemented by adopting the following solution;
Referring to fig. 2 to 5 and 10, the syringe of the present embodiment is provided with a handle portion 102 and a nipple 103, the hollow barrel 1 between the handle portion 102 and the nipple 103 is defined as a first barrel section 104, the hollow barrel 1 outside the handle portion 102 and the nipple 103 is defined as a second barrel section 105, and the second barrel section 105 is provided with external threads;
the locking nut 4 is provided with a positioning ring 401 and a connecting sleeve 402 with internal threads, the positioning ring 401 and the connecting sleeve 402 are coaxially and integrally manufactured, and the inner diameter of the positioning ring 401 is smaller than that of the connecting sleeve 402;
the push rod mechanism 3 is provided with a positioning convex ring 302, and the positioning convex ring 302 is in clearance fit with the inner wall of the hollow cylinder 1;
the external thread of the second barrel section 105, the positioning collar 302 of the push rod mechanism 3 and the lock nut 4 together limit the push rod structure and the hollow barrel 1 to a movable and inseparable connection structure, wherein the internal thread of the lock nut 4 is connected with the external thread of the second barrel section 105, and the movable path of the positioning collar 302 is limited between the positioning collar 401 and the inner wall of the hollow barrel 1.
In the process of actually assembling the injector of the present embodiment, the worker first sleeves the lock nut 4 on the push rod mechanism 3, then inserts one end of the push rod mechanism 3 having the positioning convex ring 302 into the hollow cylinder 1, and then connects the internal thread of the lock nut 4 with the external thread of the second cylinder section 105 of the hollow cylinder 1, thereby realizing that the push rod mechanism 3 and the hollow cylinder 1 are limited to be movable and inseparable connection structures.
After the lock nut 4 is connected with the hollow cylinder 1, the positioning collar 302 of the push rod mechanism 3 is restrained between the lock nut 4 and the inner wall of the hollow cylinder 1, so that the push rod mechanism 3 as a whole can move in the direction from the second cylinder section 105 to the first cylinder section 104 by the length of the sum of the lengths of the second cylinder section 105 and the first cylinder section 104, and so that the push rod mechanism 3 as a whole also moves in the direction from the first cylinder section 104 to the second cylinder section 105, but after the positioning collar 302 contacts the positioning collar 401 of the lock nut 4, the movement of the push rod mechanism 3 in the direction from the first cylinder section 104 to the second cylinder section 105 is terminated.
In order to achieve that the positioning collar 302 is confined between the lock nut 4 and the inner wall of the hollow cylinder 1, the outer diameter of the positioning collar 302 is configured to be larger than the inner diameter of the positioning collar 401.
It should be understood that, in addition to the foregoing preferred embodiment, in other embodiments, an internal thread may be provided on the inner wall of the hollow cylinder 1, and a positioning flange may be provided on the outer circumferential surface of the push rod mechanism 3 correspondingly, where the positioning flange may be similar in structure to the positioning flange 302 described above, and the positioning flange may be limited between the locking nut 4 and the inner wall of the hollow cylinder 1 by using the locking nut 4 having an external thread, where the external thread of the locking nut 4 is connected with the internal thread of the hollow cylinder 1.
It should be understood that in this embodiment, it is not recommended to directly connect the push rod mechanism 3 with the hollow cylinder 1 to form a movable and inseparable connection structure, because in the following of this embodiment, this arrangement will collide with the locking structure 390 of the push rod mechanism 3; if certain embodiments are configured in this manner, the particular configuration of the locking structure 390 of the push rod mechanism 3 must be changed.
Further, in the prior art, the root portion (the end far from the hollow barrel) of the push rod of the injector is usually provided with a push handle, and the push handle is used for increasing the contact area with the finger of the person and reducing the pressure applied to the finger of the person; since the push handle and the push rod of the injector in the prior art are fixedly arranged, and the diameter or the maximum radial length of the push handle is larger than the diameter of the push rod, in this embodiment, the lock nut 4 in this embodiment can only be sleeved on the push rod along the direction from the head (the end inserted into the hollow cylinder 1) to the root of the push rod, but since the push rod mechanism 3 in this embodiment is provided with the positioning convex ring 302, the diameter of the positioning convex ring 302 is larger than the inner diameter of the positioning ring 401 of the lock nut 4 in this embodiment, so that the lock nut 4 cannot be sleeved on the push rod with the positioning convex ring 302 in the prior art.
Therefore, on the basis of all the above schemes, how to sleeve the lock nut 4 on the push rod mechanism 3 is preferably realized by adopting the following scheme:
referring to fig. 2 or 10, the injector in the present embodiment, the push rod mechanism 3 is further provided with a detachable push handle 303;
The lock nut 4 is sleeved on the push rod mechanism 3 between the push rod 303 and the positioning convex ring 302, and the lock nut 4 forms clearance fit with the push rod mechanism 3 between the push rod 303 and the positioning convex ring 302, wherein the radial maximum length of the push rod 303 is larger than the inner diameter of the positioning ring 401.
When the push rod mechanism 3 is provided with a detachable push rod 303 and the push rod mechanism 3 is in a mutually separated state, the lock nut 4 is directly sleeved on the push rod mechanism 3, and the positioning ring 401 of the lock nut 4 and the push rod mechanism 3 are in clearance fit; after the lock nut 4 is fitted over the push rod mechanism 3, the push rod 303 is connected to the push rod mechanism 3.
The principle of the sleeve arrangement of the lock nut 4 and the push rod is as follows: the inner diameter of the positioning ring 401 of the lock nut 4 is matched with the outer diameter of the push rod mechanism 3 between the positioning convex ring 302 and the push rod 303, so that the inner diameter of the positioning ring 401 and the outer diameter of the push rod mechanism 3 can form clearance fit, and meanwhile, the inner diameter of the positioning ring 401 of the lock nut is smaller than the radial maximum length of the push rod 303 and smaller than the diameter of the positioning convex ring 302, so that the lock nut 4 cannot be directly sleeved on the push rod mechanism 3 when the push rod 303 is connected with the push rod mechanism 3.
The push handle 303 may be coupled to the push rod mechanism 3 by any number of means known in the art, including, but not limited to, threaded, snap fit, detent, adhesive, etc.
Further, on the basis of all the foregoing aspects, referring to fig. 2, 6 to 8, and 10 to 14, the injector of the present embodiment, the push rod mechanism 3 is further provided with a first sleeve 304 and a second sleeve 305;
the first sleeve 304 and the second sleeve 305 form a telescopic sleeve structure, wherein the second sleeve 305 is inserted into the first sleeve 304;
the axial both ends of the first sleeve 304 are a head end and a tip end, respectively, the positioning convex ring 302 is located on the outer circumferential surface of the first sleeve 304 at the head end, the push handle 303 is located at the tail end, and the push handle 303 is detachably connected with the first sleeve 304.
Wherein the inner circumferential surface of the first sleeve 304 is in clearance fit with the outer circumferential surface of the second sleeve 305, so that the first sleeve 304 and the second sleeve 305 can constitute a telescopic pair;
The positioning convex ring 302 and the pushing handle 303 are respectively arranged at two axial ends of the first sleeve 304, when the positioning convex ring 302 is limited between the lock nut 4 and the inner wall of the hollow cylinder 1, the second sleeve 305 can move in the space formed by the first sleeve 304 and the hollow cylinder 1, and the first sleeve 304 is limited by the positioning convex ring 302 by the lock nut 4 and the hollow cylinder 1, and the first sleeve 304 can only move in the hollow cylinder 1, so that the first sleeve 304 and the second sleeve 305 respectively form a movable and inseparable connecting structure relative to the hollow cylinder 1.
Further, on the basis of all the foregoing aspects, the injector of the present embodiment, referring to fig. 2, 6 to 9, the push rod mechanism 3 is further provided with a friction member 310;
The coil spring 301 and the friction assembly 310 are respectively disposed inside the profile of the telescopic sleeve structure, wherein the coil spring 301 and the friction assembly 310 are in a mutually separated state;
The frictional force between the friction member 310 and the second sleeve 305 is defined as a second frictional force, and the elastic force of the coil spring 301 acts on the second sleeve 305 and the first sleeve 304 along the expansion and contraction directions of the first sleeve 304 and the second sleeve 305, respectively;
the difference between the elastic force of the coil spring 301 and the second friction force is the driving force, and the elastic force of the coil spring 301 is greater than the second friction force.
In the foregoing, it has been mentioned that the elastic force of the coil spring 301 is not the driving force exerted by the push rod mechanism 3 on the piston 2; this is because, when the push rod mechanism 3 is in the contracted state, the elastic force of the coil spring 301 is maximum, the axial length of the coil spring 301 is minimum, and when the push rod mechanism 3 is shifted from the contracted state to the relaxed state, the elastic force of the coil spring 301 is gradually reduced, and thus, if the elastic force of the coil spring 301 is merely relied on as the 'driving force of the push rod mechanism 3 to be applied to the piston 2', then, as the length of the coil spring 301 is gradually increased, the elastic force of the coil spring 301 at a certain time is shifted to be smaller than the 'first friction force between the piston 2 and the hollow cylinder 1', thereby causing the piston 2 to stop at a certain position moved to the hollow cylinder 1, and the injection work cannot be completed; if the elastic force of the coil spring 301 is enhanced, it may happen that the difference between the elastic force of the coil spring 301 and the first friction force between the piston 2 and the hollow cylinder 1 exceeds the net power threshold, so that the actual driving force applied to the piston 2 by the push rod mechanism 3 is too large, resulting in too high the speed of injecting the liquid medicine and causing the patient to be unable to bear.
Therefore, in the present embodiment, in addition to the coil spring 301 being provided as a power source, a friction member 310 for controlling the driving force of the push rod mechanism 3 applied to the piston 2 in cooperation with the coil spring 301 is provided in the push rod mechanism 3;
Specifically, in the present embodiment, the elastic force of the coil spring 301 is configured to be relatively large, so as to avoid the occurrence of the phenomenon that the elastic force of the coil spring 301 at a certain moment is converted to be smaller than the first friction force between the piston 2 and the hollow cylinder 1, thereby causing the piston 2 to stop at a certain position where the piston moves to the hollow cylinder 1, and failing to complete the injection work; and, the friction component 310 is used as a resistance for limiting the elasticity of the coil spring 301, so that the phenomenon that the difference between the elasticity of the coil spring 301 and the first friction force between the piston 2 and the hollow cylinder 1 exceeds the net power threshold value, so that the actual driving force applied to the piston 2 by the push rod mechanism 3 is too large, the speed of injecting the liquid medicine is too high, and the patient cannot bear the phenomenon is avoided.
Further, referring to fig. 2,6 to 9, and 11, the syringe of the present embodiment, the friction assembly 310 includes a positioning block 311, a positioning pin 312, and a plurality of friction blocks 313;
the positioning block 311 is positioned at one end of the positioning pin 312, and the positioning block 311 is fixedly connected or detachably connected with the positioning pin 312;
The plurality of friction blocks 313 are positioned at the other end of the positioning pin 312, and the plurality of friction blocks 313 and the positioning pin 312 are detachably connected, wherein any one friction block 313 is respectively configured into a deformable structure, and the diameter of the previous friction block 313 is smaller than the diameter of the subsequent friction block 313 along the direction from the positioning pin 312 to the positioning block 311;
The second sleeve 305 is provided with a conical friction cavity 306, an opening of the friction cavity 306 faces the push handle 303, the distance from the bottom of the friction cavity 306 to the push handle 303 is larger than the distance from the opening of the friction cavity 306 to the push handle 303, and the inner diameter of the friction cavity 306 at the opening is larger than the inner diameter of the friction cavity 306 at the bottom of the cavity;
a plurality of friction blocks 313 are inserted into the friction cavity 306, and the positioning block 311 is located outside the friction cavity 306, wherein the positioning block 311 is restrained between the coil spring 301 and the push handle 303, and the elastic force of the coil spring 301 is applied to the first sleeve 304 through the positioning block 311 and the push handle 303.
Friction block 313 is preferably made of rubber or silicone material; the friction blocks 313 are preferably provided in a spherical shape or a cylindrical shape, wherein any one of the friction blocks 313 is provided with a through hole for being penetrated, respectively; the friction block 313 is sleeved on the positioning pin in an elastic deformation mode;
One end of the positioning pin 312 is connected to the positioning block 311, and the other end is used for installing a plurality of friction blocks 313, wherein one end of the positioning pin 311 for installing the plurality of friction blocks 313 is provided with a blocking block, the blocking block is configured into a cone shape, the pointed cone part of the blocking block is used for firstly inserting the friction blocks 313, the diameter of the cone bottom of the blocking block is larger, and the friction blocks 313 can be blocked after the friction blocks 313 are arranged on the positioning pin 312; the aforementioned through hole of the friction block 313 is penetrated by the blocking block, and the through hole of the friction block 313 is elastically deformed during the penetration, and the tapered bottom of the blocking block prevents the friction block 313 from being separated with respect to the positioning pin 312 after the blocking block penetrates the friction block 313.
Wherein when the push rod mechanism 3 is in a contracted state (see fig. 2 or 6), the interval between the first sleeve 304 and the second sleeve 305 is the minimum interval, at this time, the axial length of the coil spring 301 is the minimum length, the elastic force of the coil spring 301 is the maximum elastic force, meanwhile, the plurality of friction blocks 313 are positioned in the friction cavity 306 near the bottom of the cavity, and the second friction force between the plurality of friction blocks 313 and the friction cavity 306 is the maximum friction force;
and, when the push rod mechanism 3 is in the relaxed state, and the interval between the first sleeve 304 and the second sleeve 305 is the maximum interval (see fig. 8), the axial length of the coil spring 301 is the maximum length, the elastic force of the coil spring 301 is the minimum elastic force, and at the same time, the plurality of friction blocks 313 are located in the friction cavity 306 near the opening, and the second friction force between the plurality of friction blocks 313 and the friction cavity 306 is the minimum friction force;
Therefore, from the viewpoint of the transition of the push rod mechanism 3 from the contracted state to the relaxed state, the second friction force is also at the maximum friction force when the coil spring 301 is at the maximum elastic force, so that the difference between the elastic force of the coil spring 301 and the second friction force may be configured not to be higher than the net power upper limit value in the net power threshold value, and the second friction force is also at the minimum friction force when the coil spring 301 is at the minimum elastic force, so that the difference between the elastic force of the coil spring 301 and the second friction force may be configured not to be lower than the net power lower limit value in the net power threshold value.
The plurality of friction blocks 313 are different in diameter and configured such that the diameter of a preceding friction block 313 is smaller than the diameter of a following friction block 313 along the direction from the positioning pin 312 to the positioning block 311;
When the friction blocks 313 are positioned in the friction cavity 306 near the bottom of the cavity, the inner wall of the friction cavity 306 is contacted with any friction block 313 to generate deformation, and the second friction force at the moment is the sum of the friction forces of all the friction blocks 313 and the friction cavity 306;
When the plurality of friction blocks 313 move a first distance along the direction from the bottom of the cavity to the opening, the friction block 313 with the smallest diameter near the bottom of the cavity is separated from the friction cavity 306, and the second friction force at the moment is the sum of the friction forces of the rest plurality of friction blocks 313 and the friction cavity 306;
similarly, when the plurality of friction blocks 313 move a second distance in the above direction, the two friction blocks 313 with the smallest diameters near the bottom of the chamber are separated from the friction chamber 306, … …
Similarly, when the plurality of friction blocks 313 move to the third distance along the above direction, the three friction blocks 313 with the smallest diameter near the bottom of the chamber are separated from the friction chamber 306, … …
Until the plurality of friction blocks 313 move to the friction cavity 306 at the opening along the above direction, and the friction block 313 with the largest diameter far from the bottom of the cavity is separated from the friction cavity 306, the second friction force at this time is zero.
Therefore, from the perspective of the positions of the plurality of friction blocks 313 relative to the friction cavity 306, if the plurality of friction blocks 313 move along the direction from the bottom of the cavity to the opening, when the number of the plurality of friction blocks 313 contacting the friction cavity 306 is unchanged, as the positions of the plurality of friction blocks 313 moving within the same movement distance are different, the amount of change of the friction force of the friction blocks 313 within the same movement distance is kept as the linear amount of change, so that the second friction force between the friction assembly 310 and the second sleeve 305 can be properly reduced, but when the number of the plurality of friction blocks 313 contacting the friction cavity 306 is changed, the plurality of friction blocks 313 move from the previous movement distance to the next movement distance, and at least one friction block 313 and the friction cavity 306 are separated from each other, and the amount of change of the second friction force within the previous movement distance and the second friction force within the next movement distance can be regarded as the amount of change in a step manner, so that the second friction force between the friction assembly 310 and the second sleeve 305 can be significantly reduced;
Conversely, from the perspective of the positions of the plurality of friction blocks 313 relative to the friction cavity 306, if the plurality of friction blocks 313 move along the direction from the opening to the bottom of the cavity, the amount of change in the friction force of the friction blocks 313 in the same movement distance remains linear in the same movement distance, and when the number of the plurality of friction blocks 313 in contact with the friction cavity 306 is changed, the amount of change in the second friction force in the previous movement distance and the amount of change in the second friction force in the subsequent movement distance can be regarded as the amount of change in a step manner, and the second friction force between the friction assembly 310 and the second sleeve 305 can be significantly increased.
Further, referring to fig. 2, 7-8 and 11, a telescopic cavity 307 is further provided in the second sleeve 305, and the telescopic cavity 307 and the friction cavity 306 are configured to be coaxial and isolated from each other, wherein the friction cavity 306 is located inside the telescopic cavity 307;
positioning block 311 is positioned outside telescopic cavity 307;
The coil spring 301 is confined in the space between the positioning block 311 and the expansion chamber 307, and the coil spring 301 surrounds the friction chamber 306.
The telescopic cavity 307 and the friction cavity 306 are configured to be coaxial and isolated from each other, which is essentially a second sleeve 305 with a portion between the telescopic cavity 307 and the friction cavity 306;
The coil spring 301 is inserted into the bellows 307, and when the push rod mechanism 3 is in the contracted state, the coil spring 301 is restrained within the bellows 307, and when the push rod mechanism 3 is in the relaxed state, a part of the coil spring 301 is restrained within the bellows 307.
The aforementioned friction member 310 is disposed in the friction chamber 306 such that the coil spring 301 and the friction member 310 are separated from each other by a portion of the second sleeve 305 located between the expansion chamber 307 and the friction chamber 306, whereby the coil spring 301 and the friction member 310 are arranged in a coaxial and mutually isolated state.
From another perspective, a portion of the second sleeve 305 between the bellows 307 and the friction chamber 306 may be considered as a 'guide post structure' that encases the coil spring 301.
Further, referring to fig. 2, 7, 8 and 13, the second sleeve 305 is further provided with an end plate 308;
The two axial ends of the second sleeve 305 are respectively a head end and a tail end, wherein the end plate 308 is positioned at the head end, and the opening of the friction cavity 306 and the opening of the telescopic cavity 307 are respectively positioned at the tail end;
the piston 2 is coaxially arranged on an end plate 308, wherein the end plate 308 forms a clearance fit with the inner wall of the hollow cylinder 1.
The elastic force of the coil spring 301 acts on the end plate 308 and the positioning block 311, respectively, when the push rod mechanism 3 is shifted from the contracted state to the relaxed state, the end plate 308 and the positioning block 311 are forced to be separated from each other by the elastic force of the coil spring 301, wherein the end plate 308 drives the second sleeve 305 to integrally form a separation action relative to the first sleeve 304, and the positioning block 311 drives the friction assembly 310 to integrally form a separation action relative to the second sleeve 305, and the elastic force of the coil spring 301 is applied to the push handle 303 through the positioning block 311, and drives the first sleeve 304 to form a separation action relative to the second sleeve 305 through the push handle 303.
Further, in the syringe of the present embodiment, referring to fig. 10 to 14, the inner surface of the first sleeve 304 is provided with a locking pin 391, the locking pin 391 protruding from the inner surface of the first sleeve 304;
the outer surface of the second sleeve 305 is provided with a guide groove 392 and a locking groove 393, and the guide groove 392 and the locking groove 393 are respectively recessed in the outer surface of the second sleeve 305;
The extending direction of the guide groove 392 is configured in the axial line direction of the second sleeve 305, the extending direction of the locking groove 393 is configured in the circumferential direction of the second sleeve 305, and the guide groove 392 communicates with the locking groove 393;
The movement path of the lock pin 391 is limited in the guide groove 392 and in the lock groove 393, wherein the push rod mechanism 3 is in a contracted state when the lock pin 391 is located in the lock groove 393, and the push rod mechanism 3 is shifted from a contracted state to a relaxed state when the lock pin 391 is moved from the lock groove 393 into the guide groove 392.
Wherein the locking pin 391 and the locking slot 393 together form the locking structure 390 described above;
In the process of actually assembling the injector of the present embodiment, the worker aligns the first sleeve 304 and the second sleeve 305, so that the locking pin 391 on the first sleeve 304 is snapped into the guide groove 392 of the second sleeve 305, the worker pushes the first sleeve 304 and the second sleeve 305 to shorten the distance between the two, so that the locking pin 391 slides in the guide groove 392 until the locking pin 391 reaches the communication position between the guide groove 392 and the locking groove 393, the locking pin 391 is snapped and cannot continue to move along the guide groove 392, at this time, the worker screws the first sleeve 304 and/or the second sleeve 305, so that the locking pin 391 moves along the locking groove 393, and finally snaps into the groove depth of the locking groove 393 to stop the movement, thereby realizing the locking function of the locking structure 390 on the first sleeve 304 and the second sleeve 305;
In the process of actually using the syringe of the present embodiment, after the worker takes the syringe of the present embodiment, the worker maintains the current locking state of the first sleeve 304 and the second sleeve 305, at this time, the worker can push or pull the whole push rod mechanism 3, so that the whole push rod mechanism 3 drives the piston 2 to make a forward movement or a backward movement in the hollow cylinder 1; when a worker pulls the push rod mechanism 3 to enable the piston 2 to make a backward motion and enable the air cylinder 1 to generate negative pressure, the worker can draw liquid medicine by utilizing the negative pressure; after the worker draws the medical fluid with the syringe of the present embodiment, the worker installs the needle or the indwelling needle on the nipple 103 of the hollow cylinder 1, and then the worker may screw the first sleeve 304 so that the first sleeve 304 rotates with respect to the hollow cylinder 1, forcing the aforementioned locking pin 391 to move from the locking groove 393 to the place where the locking groove 393 communicates with the guide groove 392; when the locking pin 391 moves to the communication position between the locking groove 393 and the guide groove 392, the first sleeve 304 and the second sleeve 305 are unlocked, and at this time, the coil spring 301 drives the first sleeve 304 and the second sleeve 305 to be separated from each other, so as to realize an automatic intravenous injection action process; during the automatic intravenous injection action, the distance between the first sleeve 304 and the second sleeve 305 is gradually increased under the elastic force of the coil spring 301, so that the locking pin 391 is forced to move in the guide groove 392 until the piston 2 contacts the inner wall of the empty cylinder 1 at the nipple 103, the distance between the first sleeve 304 and the second sleeve 305 reaches the maximum distance to terminate the movement, and the locking pin 391 stops moving relative to the guide groove 392.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202411049538.1A CN118949197B (en) | 2024-08-01 | 2024-08-01 | syringe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411049538.1A CN118949197B (en) | 2024-08-01 | 2024-08-01 | syringe |
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| CN118949197A true CN118949197A (en) | 2024-11-15 |
| CN118949197B CN118949197B (en) | 2025-05-27 |
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| CN112076364A (en) * | 2020-10-16 | 2020-12-15 | 山东威高普瑞医药包装有限公司 | Automatic injector |
| CN217510648U (en) * | 2022-03-31 | 2022-09-30 | 任勇 | Hand-held veterinary syringe capable of automatically pushing medicine |
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2024
- 2024-08-01 CN CN202411049538.1A patent/CN118949197B/en active Active
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| US20070088290A1 (en) * | 2003-06-13 | 2007-04-19 | Hanspeter Heiniger | Drive device and method for advancig an advancing element |
| CN102209567A (en) * | 2008-10-01 | 2011-10-05 | Shl集团有限责任公司 | Medicament delivery device powered by volute spring |
| JP2015517369A (en) * | 2012-05-25 | 2015-06-22 | アプター フランス エスアーエス | Self-injector |
| CN105682707A (en) * | 2013-10-18 | 2016-06-15 | 赛诺菲-安万特德国有限公司 | Medicament delivery device with two drive springs |
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| CN217510648U (en) * | 2022-03-31 | 2022-09-30 | 任勇 | Hand-held veterinary syringe capable of automatically pushing medicine |
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| Publication number | Publication date |
|---|---|
| CN118949197B (en) | 2025-05-27 |
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