CN111097082A

CN111097082A - Conveying metering device and infusion device

Info

Publication number: CN111097082A
Application number: CN201911371264.7A
Authority: CN
Inventors: 孟美丽
Original assignee: Dopu Medical Technology Zhengzhou Co Ltd
Current assignee: Dopu Medical Technology Zhengzhou Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-05-05

Abstract

The invention relates to the technical field of fluid delivery, in particular to a delivery metering device and a transfusion device, which comprise a base, a rotating cylinder body and two pistons, wherein the rotating cylinder body comprises two cavities which are arranged by taking the axis of the rotating cylinder body as a symmetry axis, each cavity comprises a first cavity section and a second cavity section which are sequentially arranged along the direction far away from the axis, the first cavity section is used for containing fluid, the second cavity section is provided with a notch, the two pistons are respectively positioned in the two cavities, the two pistons are respectively provided with a driving rod, the base is provided with a first groove, the driving rod penetrates through the notch to enter the first groove and does cam contour line movement along the first groove, and the axis penetrates through the center of a base circle of a cam contour line; the interior of the base is provided with a fluid inlet and a fluid outlet which are arranged along the central line of the cam contour line, and the fluid inlet and the fluid outlet are respectively communicated with the two first cavity sections. The invention has continuous linear flow, high precision, low cost, wide flow speed and flow range and wide application range.

Description

Conveying metering device and infusion device

Technical Field

The invention relates to the technical field of fluid conveying, in particular to a conveying metering device and an infusion device.

Background

At present, peristaltic pumps, piston pumps and diaphragm pumps are commonly used for fluid delivery. The pump products have the structural forms of peristaltic extrusion, a piston and a diaphragm one-way valve.

The peristaltic squeeze pump is currently applied to occasions of high-capacity fluid infusion, and comprises a disposable infusion set and a control system, the infusion effect of the control mode of the infusion set can be influenced by two aspects, one is a disposable infusion set pipeline, and the other is the matching of a pump mechanical structure. On one hand, the elasticity of the infusion set pipeline is inconsistent due to long-time extrusion, liquid leakage occurs or the infusion flow is changed, and on the other hand, the gap between the finger-pressing type peristaltic pump sheet and the pump is also changed due to the aging of a mechanical structure, so that the liquid leakage or the change of the flow rate and the flow rate are caused. And the leakage is difficult to be detected, the speed can be instantly changed to zero due to the change of the flow speed, and even negative speed can occur if the leakage is not processed, so that the conveying accident is easy to occur.

The piston pump is suitable for the occasions of small-volume and higher-precision transfusion, such as an insulin transfusion pump and an anesthetic injection pump. Usually, a motor is used to drive a screw to rotate, and a nut is driven to move forward or backward to realize the movement of a piston of the injector, so that the injection of fluid medicine is completed. The infusion pump with the piston type structure has the defect of fixed volume, has no continuous suction and discharge functions, and cannot realize large-volume fluid delivery. Due to the complexity and aging of the mechanical structure and the presence of transmission gaps, high manufacturing costs are required for precise infusion.

Diaphragm one-way valve pumps achieve continuous flow by providing two one-way valves, the opening and closing of which requires adapted pressure, i.e. the sacrifice of a correspondingly small amount of fluid relative to the pump volume to open and close the valve, which in the case of fluid micro-delivery can lead to metering inaccuracies, and the presence of pressure-type one-way valves also risks undesired opening and closing, which is fatal in the medical field. It is often difficult to adequately handle low speed and small volume delivery.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problems of realizing continuous linear flow and high-precision output of fluid delivery in a safe and controllable manner at low cost and realizing wide application range.

(II) technical scheme

In order to solve the technical problem, the invention provides a conveying metering device which comprises a base, a rotating cylinder body and two pistons, wherein the rotating cylinder body comprises two cavities which are arranged by taking the axis of the rotating cylinder body as a symmetry axis, each cavity comprises a first cavity section and a second cavity section which are sequentially arranged along the direction far away from the axis, the first cavity section is used for containing fluid, the second cavity section is provided with a notch, the two pistons are respectively positioned in the two cavities, the two pistons are respectively provided with a driving rod, the base is provided with a first groove, the driving rod penetrates through the notch to enter the first groove and does cam contour line movement along the first groove, and the axis penetrates through the center of a base circle of the cam contour line; and a fluid inlet and a fluid outlet which are arranged along the central line of the cam contour line are arranged in the base, and the fluid inlet and the fluid outlet are respectively communicated with the two first cavity sections.

The first cavity section comprises a first channel and a second channel which are perpendicular to each other and communicated with each other, the side walls of the two second channels are respectively provided with a first through hole, and the two second channels are respectively communicated with the fluid inlet and the fluid outlet through the corresponding first through holes.

The rotary cylinder body is cross-shaped and comprises a first rotating portion and a second rotating portion, a first channel is located in the first rotating portion, a second channel is located in the second rotating portion, a sealing ring is sleeved on the outer side of the second rotating portion, two second through holes are formed in the sealing ring, and the first through holes are communicated with the fluid inlet and the fluid outlet through the second through holes respectively.

The outer wall of the second rotating portion is provided with a second groove surrounded in the circumferential direction, the first through holes are located in the second groove, sealing convex circumferential strips are constructed on the groove wall edges of the two sides of the second groove, two sealing blocks are arranged in the groove of the second groove, the second groove is divided into two sub-grooves through the two sealing blocks, and the first through holes are located in the two sub-grooves respectively.

The rotating cylinder body further comprises a driving portion, the driving portion and the second rotating portion are coaxially arranged, and a shaft sleeve connected with an output shaft of the driving control component is arranged in the driving portion.

The portable electronic device comprises a base, a cover body and a driving part, wherein the portable electronic device further comprises a shell and the cover body, one end of the shell is arranged on the edge of the base in a surrounding mode, the cover body is buckled at the other end of the shell, a mounting hole is formed in the cover body, and the driving part is inserted into the mounting hole.

Wherein, the shell with the lid passes through joint portion and is connected.

And a sealing ring is sleeved at one end of the piston close to the axis.

Wherein, the conveying meter is made of plastic, silica gel or rubber materials.

The invention also provides a transfusion device which comprises a driving control component and a conveying component, wherein the conveying component comprises a liquid source, an output part and the conveying meter, the liquid source is communicated with the fluid inlet, the fluid outlet is communicated with the output part through pipelines, and the output shaft of the driving control component is connected with the driving part of the rotary cylinder body.

(III) advantageous effects

The technical scheme of the invention has the following advantages: the delivery meter of the invention has the advantages of continuous linear flow, high precision, low cost, suitability for disposable sterile supply, wide flow rate and flow range and wide application range. The invention can be used for large-capacity fluid infusion and micro-fluid infusion, the infusion flow can be controlled by controlling the rotating speed and the rotating frequency of the rotating cylinder body, the requirements of fluid infusion in different occasions are met, the control effect is reliable, and the condition that the fluid is out of control can not be generated. According to the invention, the two symmetrical chambers separated from the interior of the cylinder body are rotated, so that the two chambers are kept independent, the suction and the discharge of the fluid are realized through the volume change of the fluid caused by the displacement of the piston in the chambers, the fluid molecules cannot be frequently extruded under a normal working state, the low-shear force is realized, the molecular structure of the fluid is prevented from being damaged in the conveying process, and the integrity of the molecular structure of the fluid is ensured.

In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the technical solutions will be further explained with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic illustration of an explosive structure of a transfer meter according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a delivery meter according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a rotary cylinder of the transfer gauge of the present invention;

FIG. 4 is a schematic side view of a rotary cylinder of the delivery meter of the present invention;

FIG. 5 is a schematic top view of a base of a transfer meter according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a seal ring of a delivery gauge according to an embodiment of the present invention;

FIG. 7 is a schematic view of an infusion device in accordance with an embodiment of the disclosures made herein;

FIG. 8 is a schematic cross-sectional view of a delivery gauge according to an embodiment of the present invention.

In the figure: 1: a base; 2: rotating the cylinder body; 3: a piston; 4: a seal ring; 5: a source of liquid; 6: a pipeline; 7: a drive control section; 8: a housing; 9: a cover body; 10: a clamping part; 11: a first groove; 12: a fluid inlet; 13: a fluid outlet; 21: a chamber; 22: a notch; 23: a first through hole; 24: a first rotating section; 25: a second rotating part; 26: a second groove; 27: sealing the raised circumferential strip; 28: a sealing block; 29: a drive section; 31: a drive rod; 32: a seal ring; 41: a second through hole; 91: mounting holes; 211: a first channel; 212: a second channel; 261: a sub-groove; 291: a shaft sleeve; 101: a delivery meter; 102: an output member; 103: a dynamic seal gasket; 104: moving the ceramic plate; 105: a static gasket; 106: a static ceramic plate; 1031: a first overflow aperture; 1041: a second overflowing hole; 1042: an arc-shaped groove; 1051: a third overflowing hole; 1061: and a fourth overflowing hole.

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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, in the description of the present invention, unless otherwise specified, "plurality", "plural groups" means two or more, and "several", "several groups" means one or more.

As shown in fig. 1, fig. 2, fig. 3, and fig. 5, the conveying and metering device according to the embodiment of the present invention includes a base 1, a rotary cylinder 2, and two pistons 3, where the rotary cylinder 2 includes two chambers 21 arranged with an axis as a symmetry axis, each chamber 21 includes a first chamber section and a second chamber section sequentially arranged along a direction away from the axis, the first chamber section is used for accommodating a fluid, the second chamber section is configured with a notch 22, the two pistons 3 are respectively located in the two chambers 21, the two pistons 3 are respectively provided with a driving rod 31, the base 1 is provided with a first groove 11, the driving rod 31 passes through the notch 22 to enter the first groove 11 and make a cam contour line motion along the first groove 11, and the axis passes through a center of a base circle of the cam contour line; the base 1 is internally provided with a fluid inlet 12 and a fluid outlet 13 which are arranged along the central line of the cam contour line, and the fluid inlet 12 and the fluid outlet 13 are respectively communicated with the two first cavity sections.

In the conveying and metering device of the embodiment of the invention, the rotary cylinder body 2 is arranged at the inner side of the first groove 11 of the base 1, the two pistons 3 are respectively arranged in the two chambers 21 symmetrically arranged in the rotary cylinder body 2, the chambers 21 are divided into a first chamber section close to the axis of the rotary cylinder body 2 and a second chamber section far away from the axis of the rotary cylinder body 2, a notch 22 is arranged on the side wall of the second chamber section, the driving rod 31 on the piston 3 passes through the notch 22 and is inserted into the first groove 11, when the rotary cylinder body 2 rotates around the axis of the rotary cylinder body, the driving rod 31 can move in the first groove 11, the cam contour line movement is carried out under the constraint of the first groove 11, meanwhile, the driving rod 31 is limited by the notch 22, when the piston 3 rotates along with the rotary cylinder body 2, the driving rod 31 moves in the notch 22 in a reciprocating manner, therefore, the piston 3 moves in the chamber, the base 1 is provided with a fluid inlet 12 and a fluid outlet 13 on the midline of the cam contour line, namely the fluid inlet 12 and the fluid outlet 13 are symmetrically arranged on a straight line, and with the rotation of the rotary cylinder body 2, two first cavity sections of the rotary cylinder body 2 are alternately communicated with the fluid inlet 12 and the fluid outlet 13, so that the fluid can enter and exit in the first cavity sections.

The first chamber section of the rotary cylinder 2 is a fluid volume chamber of fixed volume, and the piston 3 performs reciprocating movement in the chamber 21 while performing rotary movement, thereby generating displacement relative to the first chamber section of the rotary cylinder 2 to cause actual volume change of the fluid volume chamber. That is, when the piston 3 is far away from the axis of the rotary cylinder 2, the volume of the fluid volume chamber is gradually increased, at this time, the first chamber section of the chamber 21 where the piston 3 is located is in a conduction state with the fluid inlet 12, the fluid enters the first chamber section from the fluid inlet 12, when the volume of the fluid volume chamber is gradually increased to a fixed volume, the piston 3 approaches to the axis of the rotary cylinder 2, the first chamber section of the chamber 21 where the piston 3 is located is disconnected from the fluid inlet 12 and is in a conduction state with the fluid outlet 13, the volume of the fluid volume chamber is gradually decreased, the fluid enters the fluid outlet 13 from the first chamber section of the chamber 21, the volume of the fluid volume chamber is gradually decreased to zero, the piston 3 is far away from the axis of the rotary cylinder 2 again, thereby the cycle is repeated, and similarly, the motion process of the other piston 3 and the fluid inlet and outlet conditions of the first chamber section of the chamber 21 where the piston 3 is located are completely opposite to the, thereby, the rotary cylinder 2 sucks in and discharges the fluid, and the two pistons 3 keep the same relative displacement in the chamber 21 during the rotation, thereby realizing the equal suction and discharge.

The axis of the rotating cylinder body 2 is coincided with the center of a base circle of the cam contour line, after the rotating cylinder body 2 rotates for a certain angle at the inner side of the first groove 11, the relative displacement of the two pistons 3 in the cavity 21 is equivalent, and the nearly linear flow conveying can be realized by controlling the uniform rotation of the rotating cylinder body 2. Controlling the minimum rotation angle of the rotary cylinder 2 allows to control the minimum step amount, i.e. the accuracy, of the fluid delivery, the volume of the fluid volume chamber being fixed, the total amount delivered being a multiple of the whole number of revolutions of the rotary cylinder 2, so that a higher accuracy of the fluid delivery can also be achieved by reducing the maximum volume of the fluid volume chamber.

The delivery meter of the invention has the advantages of continuous linear flow, high precision, low cost, suitability for disposable sterile supply, wide flow rate and flow range and wide application range. The invention can be used for large-capacity fluid infusion and micro-fluid infusion, the infusion flow can be controlled by controlling the rotating speed and the rotating frequency of the rotating cylinder body 2, the requirements of fluid infusion in different occasions are met, the control effect is reliable, and the condition of out-of-control fluid is not generated. According to the invention, the two symmetrical chambers 21 separated from the interior of the cylinder body 2 are rotated, so that the two chambers 21 are kept independent, the suction and the discharge of fluid are realized through the volume change of the fluid caused by the displacement of the piston 3 in the chamber 21, the fluid molecules cannot be frequently extruded under a normal working state, the low-shear force is realized, the molecular structure of the fluid is prevented from being damaged in the conveying process, and the integrity of the molecular structure of the fluid is ensured.

The invention is not limited to a large-capacity infusion pump in the medical field, and can also be applied to the delivery of fluid medicines with intermediate capacity and micro capacity represented by an electronic analgesia pump and a micro subcutaneous insulin pump, and the system needs to be correspondingly increased or decreased according to the supervision requirements of the products in clinic. The transported fluid is fluid medicine or blood cells and the like.

In one embodiment, as shown in fig. 2, 3 and 4, the first chamber section includes a first channel 211 and a second channel 212 perpendicular to and communicating with each other, the two second channels 212 are respectively provided with a first through hole 23 on a side wall thereof, and the two second channels 212 are respectively communicated with the fluid inlet 12 and the fluid outlet 13 through the respective corresponding first through holes 23. In this embodiment, the first cavity sections in the two cavities 21 are symmetrically distributed at 180 °, and the rotating cylinder 2 separates the two cavities 21 at the axial position, so that the fluids in the two cavities 21 cannot communicate and flow with each other, the two first channels 211 are arranged perpendicular to the axial line of the rotating cylinder 2, the two second channels 212 are arranged parallel to the axial line of the rotating cylinder 2, and the ports of the two second channels 212 close to the base 1 are sealed by glue. On the side wall of the second channel 212, first through holes 23 are provided, perpendicular to the second channel 212, in order to match the fluid inlet 12 and the fluid outlet 13, the two first through holes 23 are also symmetrically distributed on the side wall of the rotary cylinder 2 by 180 degrees, in the process of rotating the rotating cylinder body 2, the two first through holes 23 are in involution communication with the fluid inlet 12 and the fluid outlet 13 in turn, when the fluid inlet 12 is rotated, the fluid flows from the fluid inlet 12 into the first through-hole 23 communicating therewith, and then flows from the second passage 212 communicating with the first through-hole 23 into the first passage 211, the piston 3 in the first passage 211 moves and fluid gradually fills the first chamber section, and when the fluid is turned to the fluid outlet 13, the fluid flows from the first passage 211 to the second passage 212 communicating therewith, and thus the first through hole 23 communicating with the second passage 212 flows into the fluid outlet 13, the piston 3 in the first passage 211 moves, and the fluid is gradually evacuated from the first chamber section.

In one embodiment, as shown in fig. 3, 4 and 6, the rotary cylinder 2 is cross-shaped and includes a first rotary portion 24 and a second rotary portion 25, the first channel 211 is located in the first rotary portion 24, the second channel 212 is located in the second rotary portion 25, the outer side of the second rotary portion 25 is sleeved with the sealing ring 4, two second through holes 41 are formed in the sealing ring 4, and the two first through holes 23 are respectively communicated with the fluid inlet 12 and the fluid outlet 13 through the two second through holes 41. In this embodiment, the horizontal portion of the cross type rotary cylinder 2 is a first rotary portion 24, the vertical portion is a second rotary portion 25, the first through hole 23 is formed on the second rotary portion 25, the second rotary portion 25 is installed on the base 1, and the outer side of the second rotating part 25 is sleeved with a sealing ring 4, two second through holes 41 which are symmetrically distributed at 180 degrees are arranged on the sealing ring 4, the first through hole 23 is communicated with the fluid inlet 12 and the fluid outlet 13, meanwhile, the sealing ring 4 is positioned between the second rotating part 25 and the fluid inlet 12 and the fluid outlet 13, the second rotating part 25 rotates and drives the first rotating part 24 to rotate, the sealing ring 4 is fixedly connected with the base 1, the two second through holes 41 are respectively communicated with the fluid inlet 12 and the fluid outlet 13, therefore, two first through holes 23 are formed in the rotating process and are communicated with the two second through holes 41 alternately, and the stability, namely the sealing performance, of the rotating cylinder body 2 arranged on the base 1 is guaranteed.

In one embodiment, as shown in fig. 2, 3 and 4, the outer wall of the second rotating part 25 is provided with a circumferentially surrounding second groove 26, the first through hole 23 is located in the second groove 26, and both groove wall edges of the second groove 26 are configured with a sealing convex circumferential strip 27, two sealing blocks 28 are arranged in the groove of the second groove 26, the second groove 26 is divided into two sub-grooves 261 by the two sealing blocks 28, and the two first through holes 23 are respectively located in the two sub-grooves 261. The second groove 26 is circumferentially arranged in a surrounding manner, a 360-degree groove communicated with the first through hole 23 is formed on the outer wall of the second rotating part 25, two sealing protrusion circumferential strips 27 are formed on the side wall of the second rotating part 25 and are respectively positioned on the side wall edges of the second groove 26 and used for sealing the second groove 26 in the axial direction and preventing fluid in the second groove 26 from overflowing, two sealing blocks 28 are arranged in the second groove 26 and divide the second groove 26 into two 180-degree sub-grooves 261, each sub-groove 261 is correspondingly communicated with one first through hole 23, the two sub-grooves 261 are not communicated with each other through the sealing blocks 28, the two sub-grooves are communicated with the two second through holes 41 in turn in a 360-degree range, namely when one sub-groove 261 is communicated with one second through hole 41 in a 180-degree range, the other sub-groove 261 is communicated with the other second through hole 41 in another 180-degree range.

In this embodiment, the first recess 11 has a 0 ° position, a 180 ° position and a 360 ° position of one rotation along the rotation direction, the volume of the fluid volume chamber formed by one piston 3 in the rotation cylinder 2 and the first chamber section of the chamber 21 in which the piston is located is 0 at the 0 ° position, that is, the volume of the fluid volume chamber is just completed in the intake stroke, and is ready to enter the exhaust stroke, while the volume of the fluid volume chamber just completed in the intake stroke is maximized in the 180 ° position of the first chamber section of the other chamber 21 in the rotation cylinder 2, and is ready to enter the exhaust stroke. In the 0 ° position, the sealing block 28 in the second groove 26 just blocks the second through hole 41 in the sealing ring 4, and both the fluid inlet 12 and the fluid outlet 13 are in a blocking state. During the rotation of the rotary cylinder 2 from the 0 ° position to the 180 ° position, a chamber 21 of the rotary cylinder 2 enters the suction stroke, the sub-groove 261 in which the first through hole 23 corresponding to the chamber 21 is located communicates with the fluid inlet 12, and the fluid enters the first section of the chamber 21 of the suction stroke; while the other chamber 21 enters the exhaust stroke, the sub-groove 261 in which the corresponding first through hole 23 of the chamber 21 is located communicates with the fluid outlet 13, and the fluid in the first section of the chamber 21 enters the exhaust stroke. In the 180 ° position, the sealing block 28 in the second recess 26 again just blocks the second through-opening 41 in the sealing ring 4, and the fluid inlet 12 and the fluid outlet 13 are again both blocked. The above-described suction stroke and discharge stroke during the rotation of the rotary cylinder 2 from the 0 deg. position to the 180 deg. position are repeated during the rotation of the rotary cylinder 2 from the 180 deg. position to the 360 deg. position, and the two pistons 3 each complete one suction and discharge stroke when the rotary cylinder 2 is rotated to the 360 deg. position. In the case of a continuous rotation of the rotating cylinder 2, a reciprocating suction and discharge of the fluid is also obtained, which are equal in quantity, so as to achieve a continuous, linear flow rate delivery of the fluid.

In one embodiment, as shown in fig. 1 and 4, the rotating cylinder 2 further includes a driving portion 29, the driving portion 29 is disposed coaxially with the second rotating portion 25, and a boss 291 is disposed in the driving portion 29 to be connected to an output shaft of the drive control part 7. The rotary cylinder body 2 is cross-shaped, the part of the vertical part below the horizontal part is the second rotary part 25, the part above the horizontal part is the driving part 29, the driving part 29 is cylindrical but is not communicated with the second rotary part 25, the inner wall of the driving part 29 is provided with the shaft sleeve 291, in the embodiment, the shaft sleeve 291 is an inner hexagonal shaft sleeve, the driving control part 7 can adopt a motor, the output shaft is an inner hexagonal shaft and is in matching connection with the inner hexagonal shaft sleeve, and the driving rotary cylinder body 2 rotates around the axis along with the motor.

As shown in fig. 1, fig. 2 and fig. 5, the conveying and metering device of the embodiment of the present invention further includes a housing 8 and a cover 9, wherein one end of the housing 8 is enclosed at the edge of the base 1, the cover 9 is fastened to the other end of the housing 8, the cover 9 is provided with a mounting hole 91, and the driving portion 29 is inserted into the mounting hole 91. In this embodiment, the housing 8 and the base 1 are integrated, the fluid inlet 12 and the fluid outlet 13 extend out of the housing 8 in a pipeline manner, and the driving portion 29 of the rotary cylinder 2 is connected to the external driving control component 7 through the mounting hole 91 of the cover 9. After the cover body 9 is buckled on the shell 8, the core components of the base 1 and the rotary cylinder body 2 are surrounded, and the effects of compact connection and protection are achieved.

In one embodiment, as shown in fig. 1 and 5, the housing 8 and the cover 9 are connected by a snap-in portion 10. Shell 8 and lid 9 adopt the joint form to be connected, and joint portion 10 includes buckle and draw-in groove, and buckle and draw-in groove can correspond the setting on shell 8 or lid 9, and in this embodiment, the draw-in groove sets up on shell 8, and the buckle setting is on lid 9, and when lid 9 was buckled to shell 8, during the buckle embedding draw-in groove, realized being connected of lid 9 and shell 8. In other embodiments, the housing 8 and the cover 9 may be connected by threads or fasteners.

In one embodiment, as shown in fig. 1, 2 and 3, the piston 3 is fitted with a sealing ring 32 at one end near the axis. The piston 3 is sealed with the inner wall of the chamber 21 where the piston is located through the sealing ring 32, so that the fluid in the fluid volume cavity is prevented from overflowing and leaking through a gap between the piston 3 and the inner wall of the chamber 21 in the moving process of the piston 3, and the sealing performance of the first cavity section is ensured.

In one embodiment, the delivery gauge 101 is made of a plastic, silicone, or rubber material. All parts forming the conveying meter are made of plastic and silica gel or rubber materials, and the parts are formed through one-step injection molding of a mold without precise processing, so that the cost can be reduced, and meanwhile, the application requirements of continuous linear flow, high precision, low shearing, sterility and the like are met.

In another embodiment, as shown in fig. 8, the outer side of the second rotating portion 25 is not sleeved with the sealing ring 4, the second rotating portion 25 is provided with a cavity, the second channel 212 is constructed by the movable sealing gasket 103 and the movable ceramic plate 104, two first through-holes 1031 are provided on the movable sealing gasket 103, a third groove and two opposite arc-shaped grooves 1042 are provided on the movable ceramic plate 104, the two arc-shaped grooves 1042 are not communicated with each other and are respectively communicated with the third groove through the second through-holes 1041, the movable sealing gasket 103 is embedded in the third groove, the two first through-holes 1031 are respectively communicated with the two arc-shaped grooves 1042 through the two second through-holes 1041, and one end of the movable ceramic plate 104 provided with the third groove is embedded in the cavity, so as to form two second channels 212. During the rotation of the second rotating part 25, the movable ceramic plate 104 and the movable sealing gasket 103 rotate synchronously therewith. The second channel 212 is communicated with the fluid inlet 12 and the fluid outlet 13 through the static ceramic plate 106 and the static sealing gasket 105, two third overflowing holes 1051 are arranged on the static sealing gasket 105, a fourth groove and a fourth overflowing hole 1061 communicated with the fourth groove are arranged on the static ceramic plate 106, the two fourth overflowing holes 1061 are respectively communicated with the fluid inlet 12 and the fluid outlet 13, the static sealing gasket 105 is embedded in the fourth groove, the two third overflowing holes 1051 are communicated with the two fourth overflowing holes 1061, the static ceramic plate 106 is arranged corresponding to the movable ceramic plate 104, and the two arc-shaped grooves 1042 can be respectively communicated with the two fourth overflowing holes 1061 in turn, so that the two second channels 212 are respectively communicated with the fluid inlet 12 and the fluid outlet 13 alternately.

As shown in fig. 1 and 7, the embodiment of the present invention further provides an infusion device, which comprises a driving control component 7 and a conveying component, wherein the conveying component comprises a liquid source 5, an output member 102 and a conveying metering device 101 as in the above embodiment, the liquid source 5 and the fluid inlet 12 and the fluid outlet 13 and the output member 102 are communicated through a pipeline 6, and an output shaft of the driving control component 7 is connected with a driving part 29 of a rotating cylinder 2.

In the infusion set of the embodiment of the present invention, the fluid flows from the fluid source 5 to the delivery meter 101 through one of the conduits 6, is metered and dispensed by the delivery meter 101, and is then delivered to the output member 102 through the other conduit 6, thereby reaching the receptor end. By combining the output meter with the drive control part 7 so that the motor of the drive control part 7 is connected with the driving part 29 of the rotary cylinder 2, the central controller of the drive control part 7 provides instructions to control the rotation speed and rotation angle of the motor to realize the fluid delivery flow rate and delivery accuracy.

When the motor stops rotating, the delivery gauge 101 stops working, and the rotating cylinder 2 does not rotate by itself due to the existence of the frictional resistance, and the fluid is not sucked and discharged. The suction and discharge strokes are also generated by the motor outputting power against frictional resistance, and the process is not affected by back pressure, and the suction and discharge amount is constant under the condition of back pressure variation.

The volume of the fluid volume chamber is known by design, the amount of fluid drawn in and expelled can be accurately controlled by the number of revolutions of the motor, different flow rates can be achieved by controlling the speed of rotation of the motor, which is easily controlled, i.e. a wide range of flow rates and flows can be easily achieved. The infusion flow rate can be controlled by controlling the rotation angle or minimum stepping angle of the motor. Meanwhile, the volume of the fluid volume cavity is changed, so that different infusion precision controls can be realized, and different application occasions are met. The application of the present invention is not limited to a large-volume infusion pump in the medical field, and can be applied to the delivery of fluid drugs of intermediate volume and minute volume, such as an electronic analgesia pump and a micro-subcutaneous insulin pump.

For example, in the field of micro-infusion insulin infusion, where the infusion of insulin is required to be on the ul level, assuming that the volume of the fluid volume chamber of the present invention is 10ul and that 10ul of insulin is expelled with the motor rotating 180 °, known stepper motor step divisions are 1, 2, 4, 8, 16, 32, 64, 128, and if an 8-division motor is used, the minimum step is 10/180/8-0.007 ul, which is not currently achievable with other pumps.

When the present invention is applied as a large capacity infusion pump, the drive control unit 7 includes a central controller, a motor and controller, an air detector and pressure sensor, power management, a display and keyboard, an alarm unit, data transmission, etc., using known and general techniques. In other infusion areas, there are also functional modules added and reduced, such as the field of electronic analgesia pumps and the field of micro subcutaneous infusion represented by insulin pumps, and the adjustment can be carried out appropriately according to the requirements of practical clinical application.

The insulin pump manufactured by the invention can adopt the primary package of insulin, does not need to be refilled into a rigid container, and only needs the insulin in the primary package as the liquid source 5 to be communicated with the fluid channel of the invention, thereby bringing convenience for use and cost saving.

When in use, the invention is not limited in the field of medical equipment, the fluid is not limited to fluid medicine, other fluids needing to be delivered and metered can be used, the receiver is not limited to human body, other containers or other receivers can be used, the combination of the delivery meter 101 and the drive control part 7 is in various forms, the combination can be in a portable installation mode at present, other modes can also be used, and the delivery meter 101 and the drive control part 7 can be provided at one time according to different requirements. The drive control unit 7 is not limited to an electric motor as a power source, and other power systems such as a solenoid, nitinol, voice coil actuator, piezoelectric motor, etc. may be used. The output member 102 may also employ a needle or other injection structure, etc.

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

1. A delivery meter, characterized by: the rotary cylinder comprises a base, a rotary cylinder body and two pistons, wherein the rotary cylinder body comprises two cavities which are arranged by taking the axis of the rotary cylinder body as a symmetry axis, each cavity comprises a first cavity section and a second cavity section which are sequentially arranged along the direction far away from the axis, the first cavity section is used for containing fluid, the second cavity section is provided with a notch, the two pistons are respectively positioned in the two cavities, the two pistons are respectively provided with a driving rod, a first groove is arranged on the base, the driving rod penetrates through the notch to enter the first groove and does cam contour line motion along the first groove, and the axis penetrates through the center of a base circle of the cam contour line; and a fluid inlet and a fluid outlet which are arranged along the central line of the cam contour line are arranged in the base, and the fluid inlet and the fluid outlet are respectively communicated with the two first cavity sections.

2. The delivery meter of claim 1, wherein: the first cavity section comprises a first channel and a second channel which are perpendicular to each other and communicated with each other, the side walls of the two second channels are respectively provided with a first through hole, and the two second channels are respectively communicated with the fluid inlet and the fluid outlet through the corresponding first through holes.

3. The delivery meter of claim 2, wherein: the shape of rotating the cylinder body is cross, including first rotation portion and second rotation portion, first passageway is located in the first rotation portion, the second passageway is located in the second rotation portion, the sealing ring is established to the outside cover of second rotation portion, be equipped with two second through-holes on the sealing ring, two first through-hole is respectively through two the second through-hole with fluid inlet with the fluid outlet intercommunication.

4. The delivery meter of claim 3, wherein: the outer wall of the second rotating portion is provided with a second groove surrounded in the circumferential direction, the first through holes are located in the second groove, sealing protruding circumferential strips are constructed on the edges of the groove walls on the two sides of the second groove, two sealing blocks are arranged in the groove of the second groove, the second groove is divided into two sub-grooves through the two sealing blocks, and the first through holes are located in the two sub-grooves respectively.

5. The delivery meter of claim 3, wherein: the rotating cylinder body further comprises a driving portion, the driving portion and the second rotating portion are coaxially arranged, and a shaft sleeve connected with an output shaft of the driving control component is arranged in the driving portion.

6. The delivery meter of claim 5, wherein: the portable electronic device is characterized by further comprising a shell and a cover body, wherein one end of the shell is arranged around the edge of the base, the cover body is buckled at the other end of the shell, a mounting hole is formed in the cover body, and the driving portion is inserted into the mounting hole.

7. The delivery meter of claim 6, wherein: the shell is connected with the cover body through a clamping portion.

8. The delivery meter of claim 1, wherein: and a sealing ring is sleeved at one end of the piston close to the axis.

9. The delivery meter of any one of claims 1-8, wherein: the conveying meter is made of plastic, silica gel or rubber materials.

10. An infusion device, characterized in that: the liquid delivery metering device comprises a driving control component and a delivery component, wherein the delivery component comprises a liquid source, an output component and the delivery metering device as set forth in any one of claims 1-9, the liquid source is communicated with the fluid inlet, the fluid outlet is communicated with the output component through pipelines, and an output shaft of the driving control component is connected with a driving part of the rotary cylinder.