CN211188571U

CN211188571U - Infusion device with non-return function for low-speed infusion

Info

Publication number: CN211188571U
Application number: CN201921834024.1U
Authority: CN
Inventors: 朱利芳; 李淑芝; 刘颖
Original assignee: AFFILIATED HOSPITAL OF INNER MONGOLIA UNIVERSITY FOR NATIONALITIES
Current assignee: AFFILIATED HOSPITAL OF INNER MONGOLIA UNIVERSITY FOR NATIONALITIES
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-08-07
Anticipated expiration: 2029-10-29

Abstract

The utility model belongs to the technical field of medical instrument, specifically a infusion set that is used for low-speed bit to have a non return function. After liquid infusion is finished, a needle needs to be pulled out in time, otherwise blood backflow can occur, the situation that blood vessels are blocked by thrombus can occur, and even serious medical accidents such as iatrogenic infection and septicemia can occur. The utility model develops a transfusion device which has the function of preventing blood return in the transfusion process so as to prevent blood in blood vessels from flowing back to a transfusion device. The infusion device comprises an infusion apparatus, a remaining needle and a clamping device, wherein the clamping device comprises a fixed clamping part and a movable clamping part, a pipe groove is arranged in the middle of the clamping part, a clamping wheel is arranged on the clamping part, and the clamping device comprises a driving part and a transmission part. The utility model discloses a two centre gripping wheels of conveyer belt control of symmetry design realize sealing the infusion pipeline in two dropping liquid interval times with periodic circular motion, prevent to return the blood and block the infusion pipeline, can also cooperate converter, or inverter motor, through the rotational speed of motor regulation conveyer belt to the seal cycle of fine setting centre gripping wheel.

Description

Infusion device with non-return function for low-speed infusion

Technical Field

The utility model belongs to the technical field of medical instrument, specifically a infusion set that is used for super slow speed bit to have a non return function.

Background

The traditional transfusion device needs to pull out the needle in time after the liquid transfusion of a transfusion bag or a transfusion bottle is finished, otherwise, the situation of blood backflow can occur, namely, the blood backflow phenomenon. Once the blood returning phenomenon occurs, blood flowing back into the infusion apparatus is coagulated into blocks, if the blood blocks enter a human body, the situation that blood vessels are blocked by thrombus may occur, even serious medical accidents such as iatrogenic infection and septicemia occur, and the health of the human body is damaged.

A disposable transfusion system is a common medical consumable, a channel between a vein and liquid medicine is established through aseptic treatment for venous transfusion, the disposable transfusion system is generally formed by connecting eight parts of a vein needle or an injection needle, a needle head protective cap, a transfusion hose, a liquid medicine filter, a flow rate regulator, a drip cup (drip funnel), a bottle plug puncture outfit, an air filter and the like, and the partial transfusion system also comprises an injection piece, a medicine adding port and the like. The working principle of the disposable infusion set is as follows: under the action of atmospheric pressure, the liquid in the bottle flows into the dropping funnel along the thin infusion hose, and when the pressure of the water column of the dropping funnel is greater than the venous pressure, the liquid in the bottle flows into the vein along the hose. Before the medical staff uses, the medical staff checks the disinfection validity period of the disposable infusion apparatus and whether the package leaks air or other abnormalities, the infusion apparatus is taken out, the bottle inserting needle is partially inserted into the infusion bottle (for example, an infusion bag, unless the infusion apparatus is an integrated infusion apparatus of an air inlet pipe and the bottle inserting needle, the air inlet device does not need to be opened, namely the air inlet needle is inserted or the air inlet hole is opened), the infusion bottle is hung on the infusion rod, the air is exhausted until the liquid medicine flows to the lower end of the infusion pipe, the regulator is closed tightly, the vein needle is punctured into the disinfected vein, after the fixing is finished, the tourniquet is.

The venous indwelling needle is also called as venous trocar, which is called as indwelling needle for short, and the core components of the venous indwelling needle comprise a soft catheter/cannula which can be indwelling in the blood vessel and a stainless steel puncture guiding needle core. When in use, the catheter and the needle core are punctured into a blood vessel together, after the catheter completely enters the blood vessel, the needle core is withdrawn, and only the soft catheter is left in the blood vessel so as to carry out intermittent, continuous or daily intravenous infusion treatment. The use of a scalp needle should be limited to the collection of blood samples or the infusion of blood, blood products with short or single dose administration, hemodynamic monitoring infusion fluids at or near isotonic, normal PH range (irritant drugs: only intermittent bolus injections).

The use method of the indwelling needle comprises the following steps:

1. preparing an article: infusion bottle (glass bottle, plastic bag, plastic bottle), infusion apparatus, fixed dressing (adhesive tape, transparent film), connection fittings (heparin cap, needleless connection), flow rate control device (infusion pump, micro pump), indwelling needle, sterile iodophor, cotton swab, tourniquet;

2. selecting blood vessels: selecting thick and straight materials, good elasticity and rich blood flow, and avoiding the venous valve and the joint;

3. disinfecting skin, wherein the disinfection range is 8cm by 8 cm;

4. and (3) tourniquet tying: 10cm above the disinfection range, the excessive tightening is not suitable, and the time is not suitable to exceed 2 minutes;

5. removing the needle protection cap, loosening the needle core: vertically and upwardly removing the needle protection cap, and loosening the needle core left and right;

6. connecting scalp needle, and exhausting;

7. puncturing: tightly pulling skin, directly pricking vein, and inserting needle at 15-30 deg.C with slow speed, and inserting needle 0.2cm after blood return;

8. withdrawing the needle core: a hand-held needle seat, and a hand-held needle core retreating;

9. conveying a guide pipe: the catheter is fully delivered into the vein;

10. loosening the tourniquet and adjusting the dropping speed;

11. sealing and nursing: fixing with a sterile transparent patch by taking the puncture point as a center. Keeping the puncture point clean and dry, replacing the transparent paste once in 3-5 days, replacing the transparent paste once in 2 days in summer, and replacing the transparent paste in time when the puncture point is not sticky or polluted;

12. recording: the label is stuck to the venipuncture site, and the puncture date, operator name, etc. are signed. And record the catheter indwelling situation and the name, dosage and usage of the special medication every day.

The indwelling needle is divided into an open type and a closed type, the open type is divided into a common type and a safety type (a needle-prick prevention type), and the closed type is divided into a common type and a safety type (a needle-prick prevention type).

Conventional nursing of the indwelling needle:

sealing and nursing

1. The purpose is as follows: the residual irritant liquid medicine is flushed into the blood flow, so that local blood vessels are prevented from being stimulated to keep a venous access; the blood at the head end of the hose is prevented from being coagulated to cause blockage when the next connection transfusion is carried out;

2. the positive pressure pipe sealing method comprises the following steps: pulling out the injection needle head by a method of pushing liquid medicine and withdrawing the needle;

3. sealing the tube with liquid: isotonic saline water: 5-10ml, washing the tube once in 6-8 hours, and diluting the heparin solution: each milliliter contains 10-100 units of heparin, and the dosage is 2-5 ml. The anticoagulation lasts for more than 12 hours;

4. and (3) correctly punching and sealing the tube: SASH, S saline → A administration → S saline → H dilution of heparin;

(II) washing tube and nursing

1. Before transfusion, the heparin cap is disinfected, and the syringe needle is connected again after the tube is washed;

2. the purpose is as follows: the residual liquid medicine in the catheter is flushed into blood vessels by using normal saline, so that chemical phlebitis caused by stimulation of local blood vessels is avoided, and incompatibility among medicines is reduced. Applied between two drug infusions or before tube sealing;

3. the method comprises the following steps: the injector is pushed and injected, and a pulse type flushing method of stopping after pushing is adopted, so that the physiological saline forms a small vortex in the guide pipe, and the residual medicine in the guide pipe is flushed completely;

4. the minimum amount of flushing fluid should be 2 times the volume of the catheter and the additional device.

The existing micro infusion device is small in matched syringe capacity, the syringe needs to be replaced for a plurality of times during long-time infusion, infusion interruption is caused to influence continuous infusion and curative effect, the micro infusion device is not suitable for patients with large injection dosage, chemotherapy drugs of tumor patients need to be continuously intravenously administered for a plurality of times, the intermittent administration is needed, the administration time needs to be set for a plurality of times, the nursing workload is increased, the disposable set infusion device with programmed control and continuous uniform administration is lacked, the nursing workload is reduced, and the clinical requirements of the patients are met.

Disclosure of Invention

The utility model aims at: an infusion device with a non-return function for low-speed infusion is developed, and the infusion device has the function of preventing blood return in the infusion process, namely, one or more of an intravenous needle or an injection needle, an infusion hose and a flow rate regulator in an infusion apparatus are closed within the interval time of two adjacent times of infusion in an infusion apparatus dropping funnel so as to prevent blood in blood vessels from flowing back to the infusion apparatus.

The technical scheme adopted for solving the technical problems is as follows:

an infusion device with a non-return function for low-speed infusion, the infusion device comprises but is not limited to an infusion apparatus, an indwelling needle; the infusion apparatus comprises but is not limited to an injection needle, a hose, a liquid medicine filter, a flow rate regulator, a dropping funnel, a bottle stopper puncture outfit and an air filter;

the air filter is arranged on the bottle stopper puncture outfit, the bottle stopper puncture outfit is connected with the dropping funnel by adopting a hose, the dropping funnel is connected with the liquid medicine filter by adopting a hose, the section of hose is provided with a flow speed regulator, and the liquid medicine filter is connected with the injection needle by adopting a hose;

the indwelling needle comprises but is not limited to a catheter, a steel needle, a transparent tee joint, an isolating plug, an extension pipe, a water stop clamp and a positive pressure joint;

the transparent tee comprises a straight pipe and an inclined branch pipe, the guide pipe is arranged at the front end of the transparent tee straight pipe, the isolation plug is arranged at the tail part of the transparent tee straight pipe, the inclined branch pipe is arranged in the middle of the transparent tee straight pipe, one end of the extension pipe is communicated with the inclined branch pipe, and the other end of the extension pipe is communicated with the positive pressure connector;

the steel needle enters from the tail end of the transparent three-way straight pipe, pierces the isolating plug and penetrates into the catheter, and the tail end of the steel needle is provided with a needle holding handle;

the water stop clamp is arranged on the extension pipe;

the method is characterized in that:

a clamping device is arranged on the hose of the infusion apparatus or the extension tube of the indwelling needle;

the clamping device is provided with a clamping part with one end hinged, the clamping part comprises a fixed clamping part and a movable clamping part, a pipe groove is arranged in the middle of the clamping part, the hose or the extension pipe is arranged in the pipe groove, and two ends of the hose or the extension pipe extend out of the port of the pipe groove;

elastic and/or viscous fixing pads are arranged at two ports of the pipe groove and used for limiting the flexible pipe or the extension pipe from falling out of the pipe groove;

the clamping part is provided with a pair of clamping wheels which are respectively arranged on the fixed clamping part and the movable clamping part;

the clamping device is arranged at the following positions:

a hose between the flow rate regulator and the liquid medicine filter of the infusion apparatus, or

Hoses between the filter and the needles of the infusion set, or

An extension pipe between the retaining needle water stop clamp and the transparent three-way inclined branch pipe,

at any one of the three positions.

The clamping device comprises a driving part and a transmission part;

the driving part comprises a driving bin, a battery or a power supply and a motor, the driving bin is arranged on the fixed clamping part and is fixedly connected with the fixed clamping part or is of an integral structure, and the motor and the battery are arranged in the driving bin; when the driving part adopts an external power supply to supply power, the motor adopts a power line to be electrically connected with the external power supply; the power output shaft of the motor is in transmission connection with the transmission part so as to drive the transmission part to run;

the movable clamping part and the fixed clamping part are both provided with a conveying belt, the conveying belt is in a side-standing trapezoid shape, the inner side of the conveying belt is provided with a guide wheel to support the conveying belt, and the guide wheel at one end of the conveying belt is a driving wheel; the clamping wheel is assembled on the conveyor belt and moves around with the conveyor belt;

the conveying belt, the guide wheel and the driving wheel on the movable clamping part are symmetrically arranged with the conveying belt, the guide wheel and the driving wheel on the fixed clamping part;

the transmission part comprises a plurality of groups of gears and chains or belts for transmission among the gears; the upper parts of the two clamping parts of the fixed clamping part and the movable clamping part are respectively provided with a positioning wheel which is used for connecting the driving wheel of the conveyor belt with the transmission part in a transmission way; a reversing wheel is arranged between the two positioning wheels and is used for driving and connecting the two positioning wheels, the two positioning wheels rotate reversely, and when the movable clamping part is opened from the fixed clamping part along the hinged part, the positioning wheels on the movable clamping part are always in driving connection with the positioning wheels on the fixed clamping part; at least one positioning wheel or reversing wheel in the two positioning wheels and the two exchanging wheels is in transmission connection with the driving part;

the positioning wheel and the reversing wheel on the movable clamping part are symmetrically arranged with the positioning wheel and the reversing wheel on the fixed clamping part;

and a conversion wheel is arranged at the connecting part of the transmission part and the driving part and is used for establishing the transmission connection relationship between the driving part and the transmission part.

The motor is a speed reducing motor, or a speed reducer is assembled on a conventional motor.

The motor is provided with a frequency converter for adjusting the rotating speed of the motor.

The conveying belt is provided with a slideway, the side wall of the slideway is provided with a foldable baffle, and the baffle can fall down along the surrounding direction of the conveying belt;

the clamping wheel is assembled in a slide way of the conveyor belt by adopting a slide block, and the slide block is limited in the slide way;

the section of the conveying belt positioned at the lower bottom of the trapezoid is provided with a return conveying belt, the return conveying belt is in conveying connection with a positioning wheel, a reversing wheel or a driving wheel, and the rotating speed of the return conveying belt is greater than that of the conveying belt.

The utility model has the advantages that: the symmetrically designed conveying belts are adopted to control the two clamping wheels to do periodic surrounding motion, and the period is consistent with the interval time of two adjacent dropping liquids in a dropping funnel of the infusion apparatus, so that the infusion pipeline is sealed in the interval time of the two dropping liquids, and the infusion pipeline is prevented from being blocked by blood returning; the clamping device is driven by the motor, the operation of the motor and the structure of the transmission part are simple and direct, the realization is easy, and the failure rate is low; in order to meet different transfusion requirements, clamping devices with various specifications can be arranged, namely the length of the trapezoidal upper bottom of the conveyor belt has various specifications, and the sealing control at various time intervals can be realized; in addition, a frequency converter or a variable frequency motor can be matched, and the rotating speed of the conveyor belt is adjusted through the motor so as to finely adjust the closed period of the clamping wheel.

Drawings

The attached drawings are as follows:

FIG. 1 is a schematic structural view of an infusion set and an indwelling needle used in cooperation and provided with a clamping device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a clamping device arranged on an infusion apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of an indwelling needle retention clip assembly according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a clamping device according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a movable clamping portion of a clamping device according to an embodiment of the present invention when the movable clamping portion is opened;

FIG. 6 is a schematic structural view of a clamping device for sealing a fluid pipeline according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a second clamping device according to the embodiment of the present invention, wherein the clamping wheel is located at the initial position of the trapezoidal upper waist of the conveyor belt;

FIG. 8 is a schematic structural view of a second clamping device according to the present invention, wherein the clamping wheel is located at the upper trapezoidal bottom of the conveyor belt to seal and forward push the infusion pipeline;

fig. 9 is a schematic structural view of a second clamping device according to the embodiment of the present invention, in which the clamping wheel is located at the lower trapezoidal waist position of the conveyor belt;

fig. 10 is a schematic structural view of a return conveyor belt disposed in a three-clamping device according to an embodiment of the present invention.

Wherein:

1 infusion set 11 bottle stopper puncture outfit 12 air filter 13 drip chamber 14 flow rate regulator 15 liquid medicine filter 16 hose 17 syringe needle

2 indwelling needle 21 positive pressure joint 22 water stop clamp 23 extension pipe 24 spacer plug 25 transparent three-way 26 steel needle 27 conduit 28 straight pipe 29 oblique branch pipe

3 the driving part 32 of the clamping device 31 drives the bin 33, the motor 34, the transmission part 35, the positioning part 36, the positioning wheel 37, the reversing wheel 38 and the switching wheel 38

4 the clamping part 41 fixes the clamping part 42, the movable clamping part 43 and the pipe groove 44 fixes the pad 45, the clamping wheel 46, the conveying belt 47, the driving wheel 48 and the guide wheel

5 return conveyer belt

6 slide way 61 baffle 62 slide block.

Detailed Description

[ example 1 ]

1-3, the present embodiment describes an infusion device with a non-return function for low-speed infusion, including but not limited to an infusion set, an indwelling needle; the infusion apparatus comprises but is not limited to an injection needle, a hose, a liquid medicine filter, a flow rate regulator, a dropping funnel, a bottle stopper puncture outfit and an air filter;

the water stop clamp is arranged on the extension pipe;

the method is characterized in that:

as shown in fig. 4-6, the clamping device is arranged on a hose of an infusion apparatus or an extension tube of an indwelling needle;

the clamping device is arranged at the following positions:

Hoses between the filter and the needles of the infusion set, or

at any one of the three positions.

It should be noted that: when the infusion is performed on a patient, particularly a patient with tumors, cardiovascular and cerebrovascular diseases, digestive tract and the like, medicines such as blood vessel protection medicines, anticoagulation medicines, hemostasis medicines, chemotherapy medicines and the like are used, and certain medicines may need to be infused at a low speed or even at an ultra-slow speed, for example, 500ml of the medicine is dripped at a constant speed within 48 hours, and the dripping is controlled to be 2-3 drops per minute. When the transfusion is carried out under the condition, the interval between two adjacent dropping liquid in the dropping funnel of the transfusion device is about dozens of seconds, dozens of seconds or even longer, and the total transfusion time is longer; in this period, there is a phenomenon that a dropping time interval is long regardless of whether the intravenous infusion is performed by directly using the injection needle of the infusion set or the intravenous infusion is performed by using the indwelling needle, and in this time interval, blood return may occur due to factors such as individual differences of patients, and the injection needle or the indwelling needle catheter may be clogged, thereby affecting the infusion treatment.

In the embodiment, at the interval of two adjacent drops in the infusion, the clamping device is adopted to seal the specific part of the infusion apparatus or the indwelling needle so as to block the pressure balance between the infusion apparatus and the indwelling needle and the outside air, so that the liquid medicine in the infusion apparatus and the indwelling needle at one side of the clamping device facing the patient is kept still, and the venous blood of the patient is prevented from flowing back into the infusion apparatus or the indwelling needle to form a thrombus blocking pipeline.

The clamping part of the clamping device is of a square structure and is divided into a fixed clamping part and a movable clamping part, the fixed clamping part is a basic component and adopts structures such as a binding band, a buckle, a hanging ring and the like or similar structures to fix the fixed clamping part on the infusion support, the body of a patient and the like, and then an infusion pipeline (a hose or an extension pipe) is placed in a pipe groove of the fixed clamping part;

the movable clamping part is hinged on the fixed clamping part and is opened or buckled along the hinged part;

the movable clamping part is provided with one surface which is jointed with the fixed clamping part, the middle part of the surface is also provided with a corresponding pipe groove corresponding to the pipe groove of the fixed clamping part, after the two clamping parts are buckled, the pipe grooves on the two clamping parts are also aligned and buckled to form a circular pipe cavity, and the pipe cavity can contain a transfusion pipeline;

the two ends of the pipe groove of the two clamping parts are provided with elastic and/or viscous fixing cushions which are fixedly attached to the wall of the pipe groove, the fixing cushions can be made of elastic materials, and one surface facing the infusion pipeline can have certain viscosity;

the clamping part is provided with a pair of clamping wheels, namely, the fixed clamping part and the movable clamping part are respectively provided with one clamping wheel, the clamping wheels are connected to the clamping part, the clamping wheels on the two clamping parts are symmetrically arranged on two sides of the pipe groove, after the two clamping parts are buckled, the two clamping wheels are correspondingly attached, and the infusion pipeline in the pipe groove is extruded and sealed in the process that the two clamping wheels approach each other.

As mentioned above, when the patient is transfusing at a low speed, the interval between two adjacent drops in the dropping funnel of the transfusion apparatus is about ten seconds or tens of seconds, or even longer, and the blood return of the patient also occurs in the interval period of the two drops. By adopting the clamping device of the embodiment, the specific execution part is the clamping wheel, so that the hose of the infusion apparatus or the extension tube of the indwelling needle is extruded and sealed, and venous blood of a patient is prevented from flowing back to the infusion pipeline. When the liquid needs to be dropped next time, the clamping wheel is opened again, the transfusion pipeline is recovered to be smooth, and the transfusion is carried out. The operations of opening (two wheels are separated from each other, and do not extrude or seal the infusion pipeline) and closing (two wheels approach, and the infusion pipeline is extruded or sealed) of the clamping wheel can be automatically completed by adopting an electronic control device, can also be combined by an electronic control mode and a mechanical control mode, and can also be completed by adopting a pure mechanical driving structure or a pure manual mode. The specific implementation method of the opening and closing operation of the gripping wheel will be described in the following embodiments.

Further, regarding the selection of the setting position of the pinching means, the pinching means is set at the following positions in the present embodiment: the flexible pipe between the infusion apparatus flow rate regulator and the liquid medicine filter at the position (I), the flexible pipe between the infusion apparatus liquid medicine filter and the injection needle at the position (II), and the extension pipe between the remaining needle water stop clamp and the transparent three-way inclined branch pipe at the position (III). When the transfusion device is directly used for transfusion, the position (I) and the position (II) are taken as the main parts, and the position (II) is preferably arranged; when the infusion apparatus is used for infusion in cooperation with the indwelling needle, the position (III) is taken as the main point, and only the clamping device is arranged at the position (III) of the indwelling needle. The clamping device is arranged on the soft wheel flow pipeline closest to the injection point of the patient, so that the control range of the clamping device for sealing the infusion pipeline is reduced as much as possible, the connection combination point of the infusion device is reduced to the minimum, the tightness of the sealed infusion pipeline is enhanced, and the possibility of blood return is reduced.

[ example 2 ]

As shown in fig. 4-6, on the basis of the above embodiments, the clamping and closing device of the present embodiment includes a driving portion and a transmission portion;

the transmission part comprises a plurality of groups of gears and chains or belts for transmission among the gears; specifically, positioning wheels are arranged on the upper parts of the two clamping parts of the fixed clamping part and the movable clamping part and are used for driving and connecting a driving wheel of the conveying belt with the transmission part; a reversing wheel is arranged between the two positioning wheels and is used for driving and connecting the two positioning wheels, the two positioning wheels rotate reversely, and when the movable clamping part is opened from the fixed clamping part along the hinged part, the positioning wheels on the movable clamping part are always in driving connection with the positioning wheels on the fixed clamping part; at least one positioning wheel or reversing wheel in the two positioning wheels and the two exchanging wheels is in transmission connection with the driving part;

It should be noted that: referring to FIGS. 7-9, the flow direction of the liquid in the infusion line is shown from top to bottom. The method of use of this example is as follows:

firstly, a motor is started, a power output shaft of the motor is in transmission connection with a conversion wheel through a reversing transmission device, and the reversing transmission device is as follows: according to the direction of a power output shaft of the motor, the torque of the motor is transmitted to the switching wheel through a bevel gear or a similar structure with a reversing transmission function, and then the torque is transmitted to the positioning wheel or the reversing wheel through the switching wheel; for convenience of description, the working principle and process of the transmission part are described in the following by taking the switching wheel as an example, and certainly, the switching wheel drives the reversing wheel and then drives the clamping part to work, and the principle is the same and so on;

the reversing transmission device adopts a small wheel to drive a large wheel, and has a speed reduction function; meanwhile, the switching wheel also adopts a mode that a small wheel drives a large wheel to reduce the rotating speed and then drive the positioning wheel, the positioning wheel simultaneously transmits the power to the positioning wheel of the movable clamping part through the reversing wheel, then the positioning wheel drives the driving wheel on the conveying belt, the driving wheel drives the conveying belt to do the surrounding motion, and finally the clamping wheel also does the surrounding motion around the conveying belt. After the speed reduction, the rotating speed transmitted to the driving wheel is very slow, and the rotating speeds of the motor and the driving wheel can be further adjusted by arranging a frequency converter on the motor (or using a variable frequency motor), so that the conveying belt can do the surrounding motion according to the time period required by medical staff. That is, by controlling the rotation speed, the time of one circle of the conveyor belt is equal to the interval time between two adjacent drops in the dropping funnel of the infusion set. Furthermore, the conveyor belt is in a side-standing trapezoid shape, the trapezoid shape is composed of an upper bottom, a lower bottom and a waist, when liquid drops in the dropping funnel drop, the two clamping wheels move to the upper bottom of the trapezoid shape through the waist above the trapezoid shape, and at the moment, the clamping wheels extrude and seal the infusion pipeline to stop infusion; during conventional transfusion, blood return is likely to occur at the moment, the reason for the blood return may be that a transfusion pipeline is not tightly closed, venous blood may be diffused to the transfusion pipeline, and the reason for the blood return is different from person to person; however, in conventional infusion, blood return still occurs even after the infusion line is closed. In this embodiment, after the infusion pipeline was sealed to the centre gripping wheel, the centre gripping wheel was driven by the motor, will continue to follow above-mentioned trapezoidal upper base downstream, at this moment, the centre gripping wheel caused the roll-over to infusion pipeline, and the speed of advancing is slower, under the circumstances of the liquid medicine of impressing to the vein as far as possible guaranteeing, the pressure that makes the infusion pipeline end (clamping device to patient's injection point position) that is sealed is slightly greater than patient's venous pressure, prevent venous blood backward flow, diffusion, thereby avoid the blood return, form the pipe of thrombus blocking infusion pipeline (including syringe needle, indwelling needle). When a drop of liquid medicine needs to be dripped, the clamping wheel returns to the position of the driving wheel through the waist and the lower bottom below the trapezoid, and enters a next circulation period.

[ example 3 ]

As shown in fig. 10, on the basis of the above embodiment, the conveyor belt of this embodiment is provided with a slideway, and a foldable baffle is arranged on a side wall of the slideway, and the baffle can fall down along the surrounding direction of the conveyor belt;

It should be noted that: when the clamping device is used, the clamping wheel is started at the upper waist position of the trapezoid, the sliding block of the clamping wheel is limited by the baffle in the conveyor belt slideway, and the clamping wheel is pushed to enter the upper bottom section of the trapezoid so as to seal and extrude a transfusion pipeline; after a surrounding period (namely the interval time between two dropping liquids in the dropping funnel), the clamping wheel reaches the initial position of the lower bottom of the trapezoid through the lower waist of the trapezoid, at the moment, the sliding block of the clamping wheel is contacted with the return conveying belt, the rotating speed of the return conveying belt is greater than that of the conveying belt and preferably much greater than that of the conveying belt, so that the clamping wheel is dragged to pass through the baffle plate of the section corresponding to the return conveying belt on the slide way, and the clamping wheel is enabled to quickly return to the initial position of the upper waist of the trapezoid to enter the next period.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. An infusion device with a non-return function for low-speed infusion, the infusion device comprises but is not limited to an infusion apparatus, an indwelling needle; the infusion apparatus comprises but is not limited to an injection needle, a hose, a liquid medicine filter, a flow rate regulator, a dropping funnel, a bottle stopper puncture outfit and an air filter;

the water stop clamp is arranged on the extension pipe;

the method is characterized in that:

the clamping device is arranged at the following positions:

Hoses between the filter and the needles of the infusion set, or

at any one of the three positions.

2. The infusion device with a back-flow function for use with a low-speed drip of claim 1, wherein:

the clamping device comprises a driving part and a transmission part;

3. The infusion device with a back-flow function for low-speed drip according to claim 2, wherein:

4. The infusion device with a back-flow function for low-speed drip according to claim 3, wherein:

5. The infusion device with a check function for a low-speed drip according to any one of claims 2 to 4, wherein: