CN209743105U - Pressure type micro-injection device - Google Patents
Pressure type micro-injection device Download PDFInfo
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- CN209743105U CN209743105U CN201920412332.9U CN201920412332U CN209743105U CN 209743105 U CN209743105 U CN 209743105U CN 201920412332 U CN201920412332 U CN 201920412332U CN 209743105 U CN209743105 U CN 209743105U
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Abstract
The utility model provides a pressure formula microinjection device controls the injection volume through adjusting gas volume to improve microinjection device's injection precision. The pressure type micro-injection device comprises a containing cavity, wherein the containing cavity comprises a gas cavity for containing gas and a liquid cavity for containing injection, a piston for separating the gas and the injection is arranged in the containing cavity, and the device further comprises a mechanism for carrying out gas exchange on the gas cavity so as to drive the piston to move. The mechanism comprises an air pump, the air pump is communicated with the air cavity through an air pipeline, and an air flowmeter is arranged on the air pipeline. The mechanism further includes a gas pressure sensor for detecting the gas pressure within the gas chamber.
Description
Technical Field
The utility model relates to a micropump field specifically relates to a pressure formula micro-injection device.
Background
The following background is provided to aid the reader in understanding the present invention and is not admitted to be prior art.
Conventional microinjection apparatus includes an injector and a stepping motor that drives a piston in the injector to move. The stepping motor comprises a screw rod and a screw rod nut, the screw rod nut is connected with the piston, the screw rod rotates under the driving of the motor, and the screw rod nut generates displacement on the screw rod. The microinjection device outputs a certain amount of liquid every time the screw nut moves one step on the screw. The injection quantity of the micro-injection device can be adjusted by adjusting the step length of the stepping motor, so that the purpose of micro-injection is achieved. However, the step size of the stepping motor is often fixed, and assuming that the injection amount corresponding to one step size is a unit injection amount, the injection amount of the microinjection apparatus can only be a multiple of the unit injection amount, and a more precise injection cannot be performed according to actual conditions.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pressure formula microinjection device controls the injection volume through adjusting gas volume to improve microinjection device's injection precision.
Pressure formula microinjection device, including holding the chamber, hold the chamber including being used for holding gaseous chamber and the liquid chamber that is used for holding the injection, hold the intracavity and be equipped with the piston that is used for separating gas and injection, its characterized in that: the device also comprises a mechanism for exchanging gas for the gas cavity so as to drive the piston to move. When injection is needed, the mechanism inflates air into the gas cavity, the volume of the gas cavity is increased, the volume of the liquid cavity is reduced, and thus the injection is ejected from the liquid cavity; the mechanism controls the displacement of the piston by adjusting the amount of gas filled in the gas cavity, so that the injection amount of the micro-injection device is accurately controlled. When the injection liquid needs to be sucked, the mechanism sucks air from the gas cavity, the volume of the gas cavity is reduced, the volume of the liquid cavity is increased, and therefore the injection liquid is sucked into the liquid cavity.
Further, the mechanism comprises an air pump, the air pump is communicated with the air cavity through an air pipeline, and an air flow meter is arranged on the air pipeline. The air pump is used for inflating to the gas chamber or drawing gas from the gas chamber, and the gas flowmeter is used for detecting the flow of the inflated gas or the drawn gas.
Further, the mechanism also comprises a gas pressure sensor for detecting the gas pressure in the gas cavity. Preferably, the gas pressure sensor is located between the piston and the junction of the gas conduit and the gas chamber. Preferably, the gas pressure sensor is fixed to the inner wall of the gas chamber, or the gas pressure sensor is suspended in the gas chamber.
Furthermore, the inner wall of the gas cavity is provided with a limiting block, and the limiting block is positioned between the piston and the gas pressure sensor. Preferably, the limiting block is close to the air pressure sensor. The limiting block is used for limiting the position of the piston, and the piston is prevented from abutting against the air pressure sensor when moving in the accommodating cavity, so that the air pressure sensor falls off under the acting force of the piston.
Further, the gas cavity comprises a cavity body and a cover body which are detachably connected, when the cavity body is connected with the cover body, the cavity body is in gas sealing connection with the cover body, and the gas pipeline is arranged on the cover body. Preferably, the lid includes the lid end and covers along, and the lid is along locating the lid end periphery, and on the gas pipeline located the lid end, the lid was equipped with the internal thread along the inner wall, the one end of cavity be equipped with the external screw thread that the internal thread matches. That is, the cover is threadedly coupled to the cavity.
Further, the liquid cavity is provided with a liquid pipeline, the liquid pipeline is communicated with the liquid cavity, a limiting bulge is arranged in the liquid cavity, and the limiting bulge is located between the communicating position of the liquid pipeline and the liquid cavity and the piston. Preferably, the limiting protrusion is close to the communication position of the liquid pipeline and the liquid cavity. The limiting bulge prevents the piston from moving to the communicating position of the liquid pipeline and the containing cavity and interfering the circulation of liquid in the liquid pipeline.
Furthermore, the liquid pipeline comprises a liquid outlet pipe, and a first one-way valve used for controlling the injection liquid to flow from the liquid cavity to the liquid outlet pipe is arranged on the liquid outlet pipe.
Further, the liquid pipeline includes the feed liquor pipe, is equipped with the second check valve that is used for controlling the injection to flow to the liquid chamber from the feed liquor pipe on the feed liquor pipe.
Furthermore, the device also comprises an alarm for receiving the electric signal, a contact sensor for generating the electric signal when the piston contacts with the limiting block and/or the limiting protrusion and transmitting the electric signal to the alarm is arranged on the limiting block and/or the limiting protrusion, and the contact sensor is connected with the alarm. When the piston is contacted with the limiting block and/or the limiting protrusion, the contact sensor generates a signal and transmits the signal to the alarm, and the alarm gives an alarm after receiving the electric signal.
The utility model has the advantages that:
1. The pressure type micro-injection device is provided with a mechanism for exchanging gas for the gas cavity so as to drive the piston to move, and the amount of the gas in the gas cavity is accurately adjusted through the mechanism, so that the displacement of the piston is controlled, the injection amount of the micro-injection device is controlled, and the accuracy of the micro-injection device is improved.
2. The mechanism comprises a gas flowmeter and a gas pressure sensor, so that the gas pressure in the gas cavity and the amount of gas filled into or pumped out of the gas cavity can be accurately adjusted conveniently.
3. The position of the piston in the containing cavity is limited through the limiting block and the limiting protrusions, interference on the air pressure sensor and the liquid pipeline when the piston moves in the containing cavity is prevented, manual observation is not needed, the position of the piston is monitored, and the use convenience of the injection device is improved.
Drawings
Fig. 1 is a schematic view of a microinjection apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of a microinjection apparatus having an effluent channel and an influent channel according to an embodiment of the present invention.
Fig. 3 is a schematic view of a microinjection apparatus having an effluent channel and an influent channel according to another embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating the detachment of the cavity and the cover according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A pressure type micro-injection device, for example as shown in fig. 1, includes a chamber 1, the chamber 1 includes a gas chamber 101 for containing gas and a liquid chamber 102 for containing injection liquid, and a piston 2 for separating gas and injection liquid is disposed in the chamber. The device also comprises means for gas exchange in the gas chamber 101 for moving the piston 2. When injection is needed, the mechanism inflates air into the gas cavity, the volume of the gas cavity is increased, the volume of the liquid cavity is reduced, and thus the injection is ejected from the liquid cavity; the displacement of the piston is controlled by adjusting the amount of gas filled in the gas cavity, so that the injection amount of the micro-injection device is accurately controlled. When the injection liquid needs to be sucked, the mechanism sucks air from the gas cavity, the volume of the gas cavity is reduced, the volume of the liquid cavity is increased, and therefore the injection liquid is sucked into the liquid cavity.
In some embodiments, as shown in fig. 1, the mechanism comprises an air pump 3, the air pump 3 is communicated with the air chamber 101 through an air pipe 301, and an air flow meter 302 is arranged on the air pipe 301. The gas flow meter is located between the gas pump 3 and the gas chamber 101. The air pump is used for inflating to the gas chamber or drawing gas from the gas chamber, and the gas flowmeter is used for detecting the flow of the inflated gas or the drawn gas.
In some embodiments, the mechanism further comprises a gas pressure sensor 1011 for detecting the gas pressure within the gas chamber. A gas pressure sensor 1011 is located between the piston 2 and the connection of the gas conduit 301 to the gas chamber 101. The air pressure sensor is fixed on the inner wall of the air cavity, as shown in figure 1; alternatively, the gas pressure sensor may be suspended within the gas chamber.
In some embodiments, as shown in fig. 2 and 3, the inner wall of the gas chamber 101 is provided with a stopper 1012, and the stopper 1012 is located between the piston 2 and the gas pressure sensor 1011. The limiting block is used for limiting the position of the piston, and the piston is prevented from tightly abutting against the air pressure sensor when moving in the accommodating cavity, so that the air pressure sensor falls off under the acting force of the piston.
In some embodiments, as shown in fig. 4, the gas chamber 101 comprises a chamber body 4 and a cover body which are detachably connected, when the chamber body 4 and the cover body are connected, the chamber body 4 and the cover body are hermetically connected, and the gas pipeline 3 is arranged on the cover body. The piston 2, the chamber 4 and the cover together form a gas chamber, as shown for example in fig. 4. The lid includes the lid end 501 and covers along 502, and the lid is located the lid end 501 periphery along 502, and on the gas pipeline 3 located the lid end 501, the lid was equipped with internal thread 5021 along the 502 inner wall, the one end of cavity 4 be equipped with external screw thread 401 that the internal thread matches. That is, the cover is threadedly coupled to the cavity.
In some embodiments, the liquid chamber 102 is provided with a liquid pipe, the liquid pipe is communicated with the liquid chamber, and a limiting protrusion 1021 is arranged in the liquid chamber, as shown in fig. 4, the limiting protrusion 1021 is positioned between the communication position of the liquid pipe and the liquid chamber 102 and the piston 2. The limiting protrusion 1021 is close to the connection of the liquid pipe and the liquid chamber 102. The limiting bulge prevents the piston from moving to the communicating position of the liquid pipeline and the containing cavity and interfering the circulation of liquid in the liquid pipeline.
In some embodiments, fluid conduit includes a fluid outlet conduit 1022, and fluid outlet conduit 1022 is provided with a first one-way valve 1023 for controlling the flow of injectate from the fluid chamber to the fluid outlet conduit, as shown, for example, in FIGS. 2-4. Effluent pipe 1022 is located at one end of the fluid chamber, and the axis of effluent pipe 1022 is collinear with the axis of fluid chamber 102, as shown, for example, in fig. 2 or 4.
in some embodiments, the fluid conduit comprises a fluid inlet tube 1024, and a second one-way valve 1025 is disposed on the fluid inlet tube 1024 for controlling the flow of the injection fluid from the fluid inlet tube to the fluid chamber. The liquid inlet pipe is arranged at one end of the liquid cavity, as shown in figure 3; alternatively, the liquid inlet pipe is provided in the side wall of the liquid chamber, as shown in fig. 2 and 4.
In some embodiments, the device further comprises an alarm for receiving an electric signal, the stopper and/or the stopper protrusion is provided with a contact sensor for generating the electric signal when the piston contacts with the stopper and/or the stopper protrusion and transmitting the electric signal to the alarm, and the contact sensor is in communication connection with the alarm. When the piston is contacted with the limiting block and/or the limiting protrusion, the contact sensor generates a signal and transmits the signal to the alarm, and the alarm gives an alarm after receiving the electric signal.
Before microinjection is performed, the gas pressure in the gas chamber is first adjusted to be equal to the pressure in the substance to be injected. For example, the substance to be injected is a vein, the pressure within the substance to be injected is venous pressure, which may be obtained through clinical testing or existing data for venous pressure may be used. The specific operation mode for regulating the air pressure in the air cavity is as follows: the air pressure in the air cavity is detected through the air pressure sensor, and when the air pressure in the air cavity is smaller than the pressure in the object to be injected, the air pump inflates the air cavity; when the air pressure in the air cavity is larger than the pressure in the object to be tested, the air pump pumps the air in the air cavity until the air pressure in the air cavity is equal to the pressure in the object to be injected. Then, the liquid outlet pipe of the micro-injection device is inserted into the object to be injected and the gas cavity is inflated, and the amount of the gas filled into the gas cavity is equal to the injection amount of the injection device. The gas flow is observed through the gas flowmeter, and the gas flow is controlled, so that the injection amount can be accurately controlled.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to include equivalent technical means as would be understood by those skilled in the art from the inventive concepts.
Claims (10)
1. Pressure formula microinjection device, including holding the chamber, hold the chamber including being used for holding gaseous chamber and the liquid chamber that is used for holding the injection, hold the intracavity and be equipped with the piston that is used for separating gas and injection, its characterized in that: the device also comprises a mechanism for exchanging gas for the gas cavity so as to drive the piston to move.
2. A pressure microinjection apparatus as claimed in claim 1, wherein: the mechanism comprises an air pump, the air pump is communicated with the air cavity through an air pipeline, and an air flowmeter is arranged on the air pipeline.
3. A pressure microinjection apparatus as claimed in claim 2, wherein: the mechanism further includes a gas pressure sensor for detecting the gas pressure within the gas chamber.
4. A pressure microinjection apparatus as claimed in claim 3, wherein: the air pressure sensor is positioned between the piston and the joint of the air pipeline and the air cavity.
5. A pressure microinjection apparatus as claimed in claim 4, wherein: the inner wall of the gas cavity is provided with a limiting block, and the limiting block is positioned between the piston and the gas pressure sensor.
6. A pressure microinjection apparatus as claimed in claim 2, wherein: the gas cavity comprises a cavity body and a cover body which are detachably connected, when the cavity body is connected with the cover body, the cavity body is in gas sealing connection with the cover body, and the gas pipeline is arranged on the cover body.
7. A pressure microinjection apparatus as claimed in claim 1, wherein: the liquid cavity is provided with a liquid pipeline which is communicated with the liquid cavity, a limiting bulge is arranged in the liquid cavity and is positioned between the communicating position of the liquid pipeline and the liquid cavity and the piston.
8. A pressure type micro-injection device according to claim 7, wherein: the liquid pipeline comprises a liquid outlet pipe, and a first one-way valve used for controlling the injection liquid to flow from the liquid cavity to the liquid outlet pipe is arranged on the liquid outlet pipe.
9. A pressure microinjection apparatus as claimed in claim 8, wherein: the liquid pipeline comprises a liquid inlet pipe, and a second one-way valve used for controlling the injection liquid to flow from the liquid inlet pipe to the liquid cavity is arranged on the liquid inlet pipe.
10. A pressure type micro-injection device according to claim 5 or 7, wherein: the device also comprises an alarm for receiving the electric signal, a contact sensor for generating the electric signal when the piston is contacted with the limiting block and/or the limiting protrusion and transmitting the electric signal to the alarm is arranged on the limiting block and/or the limiting protrusion, and the contact sensor is connected with the alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920412332.9U CN209743105U (en) | 2019-03-29 | 2019-03-29 | Pressure type micro-injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920412332.9U CN209743105U (en) | 2019-03-29 | 2019-03-29 | Pressure type micro-injection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209743105U true CN209743105U (en) | 2019-12-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920412332.9U Active CN209743105U (en) | 2019-03-29 | 2019-03-29 | Pressure type micro-injection device |
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| CN (1) | CN209743105U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111468281A (en) * | 2020-05-28 | 2020-07-31 | 江西石城县南方有色选矿设备制造有限公司 | Large-stroke efficient jigger |
-
2019
- 2019-03-29 CN CN201920412332.9U patent/CN209743105U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111468281A (en) * | 2020-05-28 | 2020-07-31 | 江西石城县南方有色选矿设备制造有限公司 | Large-stroke efficient jigger |
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