CN112220677A - Method for eliminating dead zone of injection pump and injection pump - Google Patents
Method for eliminating dead zone of injection pump and injection pump Download PDFInfo
- Publication number
- CN112220677A CN112220677A CN202011096057.8A CN202011096057A CN112220677A CN 112220677 A CN112220677 A CN 112220677A CN 202011096057 A CN202011096057 A CN 202011096057A CN 112220677 A CN112220677 A CN 112220677A
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- pump body
- liquid
- pump
- inlet valve
- cavity
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000002347 injection Methods 0.000 title abstract description 35
- 239000007924 injection Substances 0.000 title abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 113
- 238000001914 filtration Methods 0.000 claims description 10
- 241000894006 Bacteria Species 0.000 claims description 5
- 230000001580 bacterial effect Effects 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 21
- 238000010586 diagram Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
- A61J1/20—Arrangements for transferring or mixing fluids, e.g. from vial to syringe
- A61J1/2096—Combination of a vial and a syringe for transferring or mixing their contents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
- A61J1/20—Arrangements for transferring or mixing fluids, e.g. from vial to syringe
- A61J1/22—Arrangements for transferring or mixing fluids, e.g. from vial to syringe with means for metering the amount of fluid
Abstract
The invention provides a method for eliminating a dead zone of a syringe pump and the syringe pump, wherein the method comprises the following steps: opening a liquid inlet valve connected with the pump body, and injecting a predetermined amount of liquid into the cavity of the pump body through the liquid inlet valve; closing the liquid inlet valve, opening a liquid outlet valve connected with the pump body, and driving the pump body to reduce the cavity in the pump body so as to convey the liquid injected in the cavity to a target container; opening an air inlet valve connected with the pump body, and conveying the amount of gas at least larger than the current reserved volume of the pump body into the pump body; and opening the liquid outlet valve to convey the liquid in the dead zone area in the pump body to the target container. The injection pump comprises a pump body, a cavity is formed in the pump body, a first pipe body and a second pipe body extend outwards from one end of the pump body, and the first pipe body and the second pipe body are communicated with the cavity; wherein, be equipped with the admission valve on the first body, be equipped with the binary channels selection valve on the second body, the binary channels selection valve is linked together with solution source and target container respectively. The liquid that remains in the blind spot can be eliminated to this application.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a method for eliminating a dead zone of an injection pump and the injection pump.
Background
The injection pump is a medical instrument for clinically realizing high-precision liquid injection, and the pump body is driven by the motor so as to control the moving speed of the pump body, thereby controlling the flow rate of liquid and meeting the requirement of precise injection.
With the rapid development of pharmaceutical enterprises, the injection precision is further improved clinically, and the existing injection pump cannot completely inject all the liquid in the pump body into a target container, so that the situation that liquid exists in a dead zone in the injection pump body cannot be eliminated, and the injection precision is insufficient and the waste of the liquid is caused.
Disclosure of Invention
The embodiment of the invention provides a method for eliminating a dead zone of an injection pump and the injection pump, which are used for solving the problem of low injection precision of the injection pump in the prior art.
The embodiment of the invention provides a method for eliminating a dead zone of an injection pump, which comprises the following steps: opening a liquid inlet valve connected with a pump body, and injecting a predetermined amount of liquid into a cavity of the pump body through the liquid inlet valve;
closing the liquid inlet valve, opening a liquid outlet valve connected with the pump body, and driving the pump body to reduce a cavity in the pump body so as to convey liquid injected in the cavity to a target container;
opening an air inlet valve connected with the pump body, and conveying the amount of gas at least larger than the current reserved volume of the pump body into the pump body;
and opening the liquid outlet valve, and conveying the liquid in the dead zone area in the pump body to the target container.
According to one embodiment of the present invention, a method for eliminating dead space in a syringe pump, wherein opening an intake valve connected to a pump body to deliver at least an amount of gas into the pump body that is greater than a current volume of gas retained by the pump body comprises:
after the liquid inlet valve is closed, the gas inlet valve is opened until the volume of the charged gas is larger than the volume of the gas reserved in the cavity of the pump body; alternatively, the first and second electrodes may be,
and opening the liquid inlet valve, wherein the air inflation rate of the air inlet valve is greater than the liquid outflow rate of the liquid outlet valve.
According to one embodiment of the present invention, the method for eliminating the dead zone of the injection pump, wherein the step of opening the air inlet valve connected with the pump body to deliver at least a volume of gas into the pump body larger than the volume of gas currently reserved in the pump body further comprises the steps of:
filtering bacteria in the gas input by the inlet valve before the inlet valve opens.
According to one embodiment of the present invention, the method for eliminating the dead zone of the injection pump, wherein the step of opening the liquid outlet valve to deliver the liquid in the dead zone area in the pump body to the target container comprises:
the dead zone region comprises a region in a connecting pipe body between the pump body and the target container and a region in the connecting pipe body between the pump body and the liquid inlet valve.
According to one embodiment of the invention, the method for eliminating the dead zone of the injection pump, wherein the step of closing the liquid inlet valve and opening the liquid outlet valve connected with the pump body, and the step of driving the pump body to reduce the cavity in the pump body so as to deliver the liquid injected in the cavity to the target container comprises the following steps:
the pump body is driven by the power part to reduce the volume of the cavity, and then the liquid in the cavity is conveyed to the target container through the liquid outlet valve.
According to the method for eliminating the dead zone of the injection pump, the power part is a stepping motor.
The invention also provides an injection pump, which comprises a pump body, wherein a cavity is formed in the pump body, one end of the pump body extends outwards to form a first pipe body and a second pipe body, and the first pipe body and the second pipe body are communicated with the cavity; wherein the content of the first and second substances,
the liquid container is characterized in that an air inlet valve is arranged on the first pipe body, a double-channel selection valve is arranged on the second pipe body, and the double-channel selection valve is respectively communicated with the solution source and the target container.
According to one embodiment of the present invention, the method for eliminating the dead zone of the injection pump comprises a liquid inlet valve and a liquid outlet valve, wherein the liquid inlet valve is connected to the solution source, and the liquid outlet valve is communicated with the target container.
According to the method for eliminating the dead zone of the injection pump, the bacteria filtering mechanism is arranged on the side, away from the pump body, of the air inlet valve and is used for filtering the bacteria of the gas entering the pump body.
The method for eliminating the dead zone of the injection pump further comprises a power piece which is connected with the pump body and used for pushing the pump body to reduce or enlarge the volume size of the cavity in the pump body.
The embodiment of the invention provides a method for eliminating dead zones of an injection pump and the injection pump, wherein a preset amount of liquid is injected into a pump body through a liquid inlet valve, the injected liquid is conveyed to a target container through a liquid outlet valve, the liquid remained in the dead zone region is conveyed into the pump body through an air inlet valve to open the liquid outlet valve, and the remained liquid is further conveyed to the target container by utilizing pressure difference, so that the remained liquid in the dead zone of the injection pump is eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of one embodiment of a method of eliminating a dead zone in a syringe pump according to the present application;
FIG. 2 is a schematic structural diagram of an embodiment of the syringe pump of the present application;
FIG. 3 is a top view of FIG. 2;
fig. 4 is a cross-sectional view taken at a-a shown in fig. 3.
Reference numerals:
10. a pump body; 110. a chamber; 120. a first pipe body; 1210. an intake valve; 130. a second tube body; 1310. a two-channel selector valve; 1311. a liquid inlet valve; 1313. a liquid outlet valve;
20. a target container; 30. a source of solution; 40. and a power part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the embodiments of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other components or elements inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of a method for eliminating a dead zone of a syringe pump according to the present invention. The application provides a method for eliminating dead zones of a syringe pump, comprising the following steps:
s110: and opening a liquid inlet valve connected with the pump body, and injecting a predetermined amount of liquid into the cavity of the pump body through the liquid inlet valve. The pump body is internally provided with a cavity for containing liquid to be injected, the solution source is connected with the pump body, a liquid inlet valve is arranged between the solution source and the pump body, and the liquid inlet valve is opened so as to convey the liquid in the solution source into the pump body. Meanwhile, the volume of the solution source is quantitative, so that the liquid in the solution source can be quantitatively conveyed into the pump body. It should be noted that the pump body may also be provided with scale marks, and the solution source may deliver a fixed amount of liquid to the pump body.
S120: and closing the liquid inlet valve, opening a liquid outlet valve connected with the pump body, and driving the pump body to reduce the cavity in the pump body so as to convey the liquid injected in the cavity to a target container. That is, when the liquid in the solution source is quantitatively delivered into the cavity, the liquid inlet valve can be closed, the liquid outlet valve is opened, and then the pump body is driven by the power part connected with the pump body to reduce the cavity in the pump body, so that the liquid in the cavity can be delivered to the target container. In this application, the power member may be a stepping motor, and in other embodiments, it may also be other power members such as a hydraulic rod, which is not limited herein. The stepping motor can be matched with the screw rod and the driver to be abutted against the pump body, and then the speed of conveying the pump body to the target container can be controlled.
S130: and opening an air inlet valve connected with the pump body, and conveying the amount of gas at least larger than the current reserved volume of the pump body into the pump body. The volume of the gas conveyed into the pump body is larger than the volume reserved in the current pump body, so that the pressure in the pump body can be increased to be larger than the external atmospheric pressure. The air intake valve may be connected to an air pump, and the air pump may be a manual air pump or an automatic air pump, which is not limited herein.
S140: and opening the liquid outlet valve to convey the liquid in the dead zone area in the pump body to the target container. When the liquid is stopped to be delivered between the liquid outlet valve and the target container, the liquid left in the corresponding current pump body is the liquid in the dead zone area. And then the air inlet valve can be opened to convey air into the pump body so as to improve the pressure intensity in the pump body. When the amount of the charged gas is larger than the volume of the space currently reserved in the pump body, the current atmospheric pressure in the corresponding pump body is larger than the external atmospheric pressure. The liquid in the dead zone area is further transported towards the target container by opening the liquid outlet valve, thereby eliminating the liquid in the dead zone area.
In one embodiment of the present application, the air intake valve may be opened when the liquid transportation between the pump body and the target container is stopped, and the gas may be transported into the pump body, and the liquid in the dead zone region may be eliminated by the air pressure when the amount of the transported gas is larger than the volume remaining in the pump body. In other embodiments, gas can be conveyed into the pump body in the conveying process of the liquid outlet valve and the target container, so that the conveying speed of the pump body to the target container can be increased, the gas inlet speed of the conveyed gas is set to be greater than the liquid outlet speed of the liquid outlet valve, the pressure in the pump body is always greater than the outside, and therefore liquid in a dead zone area in the pump body is eliminated by utilizing the gas pressure.
In addition, the gas needs to be subjected to bacterial filtration before the gas inlet valve delivers the gas into the pump body, so that the gas introduced into the target container does not pollute the liquid in the target container.
And the dead zone region includes: the area in the connecting pipe body between the pump body and the target container and the area in the connecting pipe body between the pump body and the liquid inlet valve. It will be appreciated that some liquid may remain in the pump body, but the amount remaining in the pump body is negligible compared to the remaining liquid in the connecting tube between the pump body and the target container and between the body and the inlet valve. Because the connecting tube body has certain length, so the connecting tube body can remain partial liquid, cause the precision that the injection pump carried liquid not high, and in this application, the setting up of admission valve alright with eliminate the remaining of the internal dead zone regional interior liquid of connecting tube completely, and then improve the injection precision of injection pump.
Referring to fig. 2, fig. 3 and fig. 4, fig. 2 is a schematic structural diagram of an embodiment of the syringe pump of the present application; FIG. 3 is a top view of FIG. 2; fig. 4 is a cross-sectional view taken at a-a shown in fig. 3.
The present invention further provides a syringe pump, which includes a pump body 10, a chamber 110 is disposed in the pump body 10, and a first tube 120 and a second tube 130 extend outward from one end of the pump body 10, in an embodiment of the present application, the first tube 120 and the second tube 130 are disposed at an interval, and both the first tube 120 and the second tube 130 are communicated with the chamber 110; the first tube 120 is provided with an air inlet valve 1210, the second tube 130 is provided with a dual-channel selector valve 1310, and the dual-channel selector valve 1310 is respectively communicated with the solution source 30 and the target container 20. The solution source 30 can deliver the liquid into the pump body 10, and the external force pushes the pump body 10 to reduce the volume of the chamber 110, so as to deliver the liquid in the pump body 10 to the target container 20. After the delivery is completed, the dual-channel selector valve 1310 is closed, and then the air is delivered into the pump body 10 through the air inlet valve 1210 to increase the pressure inside the pump body 10, and the valve port in the dual-channel selector valve 1310 connected with the target container 20 is opened to further deliver the liquid remaining in the dead zone area to the target container 20, so as to improve the injection precision of the injection pump. The air intake valve 1210 is required to perform a bacterial filtering operation on the air before the air is delivered to the pump body 10, so that the air delivered to the pump body 10 does not contaminate the liquid in the body. It should be noted that the terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In one embodiment of the present application, the dual-channel selection valve 1310 includes an inlet valve 1311 and an outlet valve 1313, the inlet valve 1311 is connected to the solution source 30, and the outlet valve 1313 is connected to the target container 20. That is, the liquid in the solution source 30 can be delivered to the pump body 10 by opening the liquid inlet valve 1311. Liquid in the pump body 10 can be delivered to the target container 20 by opening the liquid outlet valve 1313.
A bacterial filtering mechanism is also included for filtering the gas input into the pump body 10, in one embodiment of the present application, the bacterial filtering mechanism is a filter membrane.
In one embodiment of the present application, the power member 40 pushes the pump body 10 to reduce or enlarge the volume of the cavity 110 in the pump body 10. The power element 40 may be a stepper motor that cooperates with a driver and a lead screw to drive the pump body 10 to reduce or enlarge the size of the cavity 110 in the pump body 10. In other embodiments, the power member 40 may also be a hydraulic rod, and the like, which is not limited herein.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of eliminating a dead zone of a syringe pump, comprising:
opening a liquid inlet valve connected with a pump body, and injecting a predetermined amount of liquid into a cavity of the pump body through the liquid inlet valve;
closing the liquid inlet valve, opening a liquid outlet valve connected with the pump body, and driving the pump body to reduce a cavity in the pump body so as to convey liquid injected in the cavity to a target container;
opening an air inlet valve connected with the pump body, and conveying the amount of gas at least larger than the current reserved volume of the pump body into the pump body;
and opening the liquid outlet valve, and conveying the liquid in the dead zone area in the pump body to the target container.
2. The method of eliminating dead space in a syringe pump of claim 1, wherein opening an intake valve associated with the pump body to deliver at least an amount of gas into the pump body that is greater than a current volume retained by the pump body comprises:
after the liquid inlet valve is closed, the gas inlet valve is opened until the volume of the charged gas is larger than the volume of the gas reserved in the cavity of the pump body; alternatively, the first and second electrodes may be,
and opening the liquid inlet valve, wherein the gas charging speed of the gas inlet valve is greater than the liquid discharging speed of the liquid outlet valve.
3. The method of eliminating dead space in a syringe pump of claim 1, wherein opening an intake valve associated with the pump body to deliver at least an amount of gas into the pump body that is greater than a current volume retained by the pump body further comprises:
bacterial filtration of the gas input to the inlet valve is performed before the inlet valve is opened.
4. The method of eliminating dead space in a syringe pump of claim 1, wherein said opening said exit valve to deliver liquid from the dead space region in said pump body to said target container comprises:
the dead zone region comprises a region in a connecting pipe body between the pump body and the target container and a region in the connecting pipe body between the pump body and the liquid inlet valve.
5. The method of claim 4, wherein closing the inlet valve and opening an outlet valve connected to the pump body, and actuating the pump body to reduce the cavity in the pump body to deliver the liquid injected in the cavity to a target container comprises:
the pump body is driven by the power part to reduce the volume of the cavity, and then the liquid in the cavity is conveyed to the target container through the liquid outlet valve.
6. The method of eliminating the dead zone of a syringe pump of claim 5 wherein the motive member is a stepper motor.
7. A syringe pump is characterized by comprising a pump body, wherein a cavity is formed in the pump body, one end of the pump body extends outwards to form a first pipe body and a second pipe body, and the first pipe body and the second pipe body are communicated with the cavity; wherein the content of the first and second substances,
the liquid container is characterized in that an air inlet valve is arranged on the first pipe body, a double-channel selection valve is arranged on the second pipe body, and the double-channel selection valve is respectively communicated with the solution source and the target container.
8. The syringe pump of claim 7, wherein the dual-channel selector valve comprises an inlet valve connected to the solution source and an outlet valve in communication with the target container.
9. The syringe pump of claim 7, further comprising a bacteria filter mechanism disposed on a side of the intake valve remote from the pump body for filtering bacteria in the gas entering the pump body.
10. The syringe pump of claim 7, further comprising a motive member coupled to the pump body for propelling the pump body to reduce or enlarge the volume of the chamber within the pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011096057.8A CN112220677A (en) | 2020-10-14 | 2020-10-14 | Method for eliminating dead zone of injection pump and injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011096057.8A CN112220677A (en) | 2020-10-14 | 2020-10-14 | Method for eliminating dead zone of injection pump and injection pump |
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| Publication Number | Publication Date |
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| CN112220677A true CN112220677A (en) | 2021-01-15 |
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| CN202011096057.8A Pending CN112220677A (en) | 2020-10-14 | 2020-10-14 | Method for eliminating dead zone of injection pump and injection pump |
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| CN (1) | CN112220677A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112915011A (en) * | 2021-01-22 | 2021-06-08 | 北京中关村水木医疗科技有限公司 | Liquid discharging method and device for liquid separating instrument |
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