Delivery meter and infusion device

Abstract

The present invention relates to the field of fluid delivery technology, and in particular to a delivery meter and an infusion device, comprising a base, a rotating cylinder and two pistons, the rotating cylinder comprising two chambers arranged with its axis as the axis of symmetry, each chamber comprising a first chamber section and a second chamber section arranged in sequence in a direction away from the axis, the first chamber section being used to contain fluid, the second chamber section being configured with a notch, the two pistons being respectively located in the two chambers, and the two pistons being respectively provided with a driving rod, a first groove being provided on the base, the driving rod passing through the notch into the first groove, and moving along the first groove along a cam profile, the axis passing through the center of the base circle of the cam profile; a fluid inlet and a fluid outlet arranged along the center line of the cam profile are provided inside the base, and the fluid inlet and the fluid outlet are respectively connected with the two first chamber sections. The present invention has continuous linear flow, high precision, low cost, a wide flow rate and flow range and a wide application range.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid delivery, and in particular to a delivery meter and an infusion device. Background Art

[0002] At present, people usually use peristaltic pumps, piston pumps, and diaphragm pumps for fluid transportation. The structural forms of these pump products include peristaltic extrusion, piston, and diaphragm check valve.

[0003] Peristaltic extrusion pumps are currently used in large-volume fluid infusion situations, including disposable infusion sets and control systems. The infusion effect of this infusion pump control method will be affected by two aspects: one is the disposable infusion set pipeline, and the other is the coordination of the pump mechanical structure. On the one hand, long-term extrusion will cause inconsistent elastic changes in the infusion set pipeline, leakage or changes in the infusion flow rate. On the other hand, due to the aging of the mechanical structure, the gap between the finger-pressure peristaltic pump sheet and the pump will also change, causing leakage or changes in flow rate. In addition, leakage is not easy to detect, and changes in flow rate will cause the speed to instantly become zero. If not handled, negative speed may even occur, which is prone to transportation accidents.

[0004] Piston pumps are suitable for small-volume and higher-precision infusions, such as insulin infusion pumps and anesthetic injection pumps. Usually, a motor is used to drive the screw to rotate and drive the nut forward or backward to achieve the movement of the syringe piston, thereby completing the injection of fluid drugs. The piston-type infusion pump has the defect of fixed volume, without the function of continuous suction and discharge, and cannot achieve large-volume fluid delivery. Due to the complex and aging mechanical structure and the existence of transmission parts gaps, a high manufacturing cost is required to achieve the purpose of accurate infusion.

[0005] The diaphragm check valve pump achieves continuous flow by setting two check valves. The opening and closing of the check valve requires an adaptive pressure, which means that a small amount of fluid corresponding to the pump volume needs to be sacrificed to open and close the valve, which will lead to inaccurate metering in the case of micro-fluid delivery. The existence of the pressure check valve also has the risk of not opening and closing as expected, which is fatal in the medical field. It is usually difficult to perform at low speed and small volume delivery. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The technical problem to be solved by the present invention is to realize continuous linear flow and high-precision output of fluid delivery in a safe and controllable manner at low cost, as well as a wide range of applications.

[0008] (II) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a conveying meter, including a base, a rotating cylinder body and two pistons, the rotating cylinder body including two chambers arranged with its axis as the axis of symmetry, each of the chambers including a first chamber section and a second chamber section arranged in sequence along a direction away from the axis, the first chamber section is used to accommodate fluid, the second chamber section is configured with a notch, the two pistons are respectively located in the two chambers, and the two pistons are respectively provided with a driving rod, the base is provided with a first groove, the driving rod passes through the notch into the first groove, and moves along the first groove along a cam contour line, and the axis passes through the center of the base circle of the cam contour line; the interior of the base is provided with a fluid inlet and a fluid outlet arranged along the midline of the cam contour line, and the fluid inlet and the fluid outlet are respectively connected to the two first chamber sections.

[0010] The first cavity section includes a first channel and a second channel which are perpendicular to each other and connected, and first through holes are respectively provided on the side walls of the two second channels. The two second channels are connected to the fluid inlet and the fluid outlet respectively through the first through holes corresponding to each other.

[0011] Wherein, the shape of the rotating cylinder body is a cross, including a first rotating part and a second rotating part, the first channel is located in the first rotating part, the second channel is located in the second rotating part, a sealing ring is sleeved on the outer side of the second rotating part, and two second through holes are provided on the sealing ring, and the two first through holes are respectively connected to the fluid inlet and the fluid outlet through the two second through holes.

[0012] Among them, the outer wall of the second rotating part is provided with a circumferentially surrounding second groove, the first through hole is located in the second groove, and the groove wall edges on both sides of the second groove are constructed with sealing protrusion circumferential strips, two sealing blocks are provided in the groove of the second groove, the second groove is divided into two sub-grooves by the two sealing blocks, and the two first through holes are respectively located in the two sub-grooves.

[0013] Wherein, the rotating cylinder body further comprises a driving part, the driving part is coaxially arranged with the second rotating part, and a bushing connected to the output shaft of the driving control component is arranged inside the driving part.

[0014] It also includes a shell and a cover body, one end of the shell is arranged around the edge of the base, and the cover body is buckled on the other end of the shell, and the cover body is provided with a mounting hole, and the driving part is inserted into the mounting hole.

[0015] Wherein, the shell and the cover are connected via a clamping portion.

[0016] Wherein, a sealing ring is sleeved on one end of the piston close to the axis.

[0017] Wherein, the conveying meter is made of plastic, silicone or rubber material.

[0018] The present invention also provides an infusion device, comprising a drive control component and a conveying component, wherein the conveying component comprises a liquid source, an output component and the conveying meter as described above, the liquid source and the fluid inlet, as well as the fluid outlet and the output component are connected via pipelines, and the output shaft of the drive control component is connected to the driving part of the rotating cylinder body.

[0019] (III) Beneficial effects

[0020] The above technical scheme of the present invention has the following advantages: the delivery meter of the present invention has the advantages of continuous linear flow, high precision, low cost, suitable for disposable sterile provision, wide flow rate range, and wide application range. The present invention can be used not only for large-volume fluid infusion, but also for trace fluid infusion. The infusion flow rate can be controlled by controlling the rotation speed and rotation frequency of the rotating cylinder to meet the needs of fluid infusion in different occasions. Moreover, the control effect is reliable and the fluid will not be out of control. The two symmetrical chambers separated inside the rotating cylinder of the present invention keep the two chambers independent. The suction and discharge of the fluid is achieved by the change in fluid volume caused by the displacement of the piston in the chamber. Under normal working conditions, the fluid molecules will not be frequently squeezed, and it has low shear force, which avoids the molecular structure of the fluid from being destroyed during the transportation process, thereby ensuring the integrity of the molecular structure of the fluid.

[0021] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the exploded structure of the conveying metering device according to an embodiment of the present invention;

[0023] Figure 2 is a schematic cross-sectional structural diagram of a conveying metering device according to an embodiment of the present invention;

[0024] Figure 3 It is a schematic cross-sectional view of the rotating cylinder of the conveying metering device according to an embodiment of the present invention;

[0025] Figure 4 2 is a schematic side view of the structure of a rotating cylinder of a conveying metering device according to an embodiment of the present invention;

[0026] Figure 5 1 is a schematic diagram of a top view of a base of a conveying metering device according to an embodiment of the present invention;

[0027] Figure 6 is a schematic cross-sectional structural diagram of a sealing ring of a conveying metering device according to an embodiment of the present invention;

[0028] Figure 7 is a schematic structural diagram of an infusion device according to an embodiment of the present invention;

[0029] Figure 8 It is a schematic cross-sectional view of the structure of the conveying metering device according to an embodiment of the present invention.

[0030] In the figure: 1: base; 2: rotating cylinder; 3: piston; 4: sealing ring; 5: liquid source; 6: pipeline; 7: drive control component; 8: housing; 9: cover; 10: clamping part; 11: first groove; 12: fluid inlet; 13: fluid outlet; 21: chamber; 22: notch; 23: first through hole; 24: first rotating part; 25: second rotating part; 26: second groove; 27: sealing protrusion circumferential strip; 28: sealing block; 29: driving part; 31: driving rod ; 32: sealing ring; 41: second through hole; 91: mounting hole; 211: first channel; 212: second channel; 261: sub-groove; 291: bushing; 101: conveying meter; 102: output member; 103: dynamic sealing gasket; 104: dynamic ceramic plate; 105: static sealing gasket; 106: static ceramic plate; 1031: first flow hole; 1041: second flow hole; 1042: arc groove; 1051: third flow hole; 1061: fourth flow hole. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more, and "several", "several roots", and "several groups" mean one or more.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the conveying metering device provided by the embodiment of the present invention includes a base 1, a rotating cylinder body 2 and two pistons 3. The rotating cylinder body 2 includes two chambers 21 arranged with its axis as the symmetry axis. Each chamber 21 includes a first chamber section and a second chamber section arranged in sequence along a direction away from the axis. The first chamber section is used to accommodate fluid, and the second chamber section is configured with a notch 22. The two pistons 3 are respectively located in the two chambers 21, and 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 and enters the first groove 11, and moves along the first groove 11 along a cam profile, and the axis passes through the center of the base circle of the cam profile. The base 1 is provided with a fluid inlet 12 and a fluid outlet 13 arranged along the center line of the cam profile, and the fluid inlet 12 and the fluid outlet 13 are respectively connected to the two first chamber sections.

[0035] In the conveying metering device of the embodiment of the present invention, the rotating cylinder body 2 is arranged on the inner side of the first groove 11 of the base 1, and the two pistons 3 are respectively arranged in two chambers 21 symmetrically arranged in the rotating cylinder body 2. The chamber 21 is divided into a first chamber section close to the axis of the rotating cylinder body 2 and a second chamber section away from the axis of the rotating cylinder body 2, and 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 rotating cylinder body 2 rotates around its axis, the driving rod 31 can move in the first groove 11 and is constrained by the first groove 11 to act as a cam wheel. The piston 3 moves along the cam contour and is limited by the notch 22. While the piston 3 rotates with the rotating cylinder body 2, the driving rod 31 reciprocates in the notch 22. Therefore, the piston 3 reciprocates in the chamber 21 in a direction close to or away from the axis of the rotating cylinder body 2. The base 1 is provided with a fluid inlet 12 and a fluid outlet 13 on the midline of the cam contour, that is, the fluid inlet 12 and the fluid outlet 13 are symmetrically arranged on a straight line. With the rotation of the rotating cylinder body 2, the two first chamber sections of the rotating cylinder body 2 are alternately connected to the fluid inlet 12 and the fluid outlet 13, so that the fluid enters and exits the first chamber section.

[0036] The first cavity section of the rotating cylinder body 2 is a fluid volume cavity of fixed volume. The piston 3 reciprocates in the cavity 21 while rotating, thereby generating displacement relative to the first cavity section of the rotating cylinder body 2 and causing the actual volume of the fluid volume cavity to change. That is, when the piston 3 moves away from the axis of the rotating cylinder body 2, the volume of the fluid volume chamber gradually increases. At this time, the first cavity section of the chamber 21 where the piston 3 is located is in a conducting state with the fluid inlet 12, and the fluid enters the first cavity section from the fluid inlet 12. When the volume of the fluid volume chamber gradually increases to a fixed volume, the piston 3 approaches the axis of the rotating cylinder body 2, and the first cavity section of the chamber 21 where the piston 3 is located is disconnected from the fluid inlet 12 and is in a conducting state with the fluid outlet 13. The volume of the fluid volume chamber gradually decreases, and the fluid enters the fluid outlet 13 from the first cavity section of the chamber 21. When the volume of the fluid volume chamber gradually decreases to zero, the piston 3 moves away from the axis of the rotating cylinder body 2 again, and the cycle repeats. Similarly, the movement process of the other piston 3 and the inlet and outlet fluid conditions of the first cavity section of the chamber 21 where it is located are completely opposite to the above content, thereby realizing that the rotating cylinder body 2 inhales fluid while discharging fluid, and the two pistons 3 maintain the same relative displacement in the chamber 21 during the rotation process, thereby realizing equal amounts of suction and discharge.

[0037] The axis of the rotating cylinder 2 coincides with the center of the base circle of the cam profile. After the rotating cylinder 2 rotates a certain angle inside the first groove 11, the relative displacements of the two pistons 3 in the chamber 21 are equal. By controlling the uniform rotation of the rotating cylinder 2, nearly linear flow delivery can be achieved. Controlling the minimum rotation angle of the rotating cylinder 2 can control the minimum step amount of fluid delivery, that is, the accuracy. The volume of the fluid volume chamber is fixed, and the total amount delivered is a multiple of the number of full revolutions of the rotating cylinder 2. Therefore, higher-precision fluid delivery can also be achieved by reducing the maximum volume of the fluid volume chamber.

[0038] The delivery meter of the present invention has the advantages of continuous linear flow, high precision, low cost, suitable for disposable sterile provision, wide flow rate range, and wide application range. The present invention can be used not only for large-volume fluid infusion, but also for trace fluid infusion. The infusion flow rate can be controlled by controlling the rotation speed and rotation frequency of the rotating cylinder 2 to meet the needs of fluid infusion in different occasions. Moreover, the control effect is reliable and the fluid will not be out of control. The two symmetrical chambers 21 separated inside the rotating cylinder 2 of the present invention keep the two chambers 21 independent. The suction and discharge of the fluid is achieved by the change in fluid volume brought about by the displacement of the piston 3 in the chamber 21. Under normal working conditions, the fluid molecules will not be frequently squeezed, and low shear force is provided to avoid the molecular structure of the fluid from being destroyed during the transportation process, thereby ensuring the integrity of the molecular structure of the fluid.

[0039] The application of the present invention in the medical field is not limited to large-capacity infusion pumps, but can also be applied to the delivery of intermediate-capacity and micro-capacity fluid drugs represented by electronic analgesic pumps and micro-subcutaneous insulin pumps. In clinical practice, the control system needs to be increased or decreased accordingly in combination with the regulatory requirements of these products. The delivered fluid is fluid drugs or blood cells, etc.

[0040] In one embodiment, Figure 2 , Figure 3 and Figure 4 As shown, the first cavity section includes a first channel 211 and a second channel 212 which are perpendicular to each other and communicate with each other, and first through holes 23 are respectively provided on the side walls of the two second channels 212. The two second channels 212 are respectively communicated with the fluid inlet 12 and the fluid outlet 13 through the first through holes 23 corresponding to each other. In this embodiment, the first cavity sections in the two chambers 21 are symmetrically distributed at 180°, and the rotating cylinder body 2 separates the two chambers 21 at the axis position so that the fluids in the two chambers 21 cannot communicate with each other and flow, the two first channels 211 are arranged perpendicular to the axis of the rotating cylinder body 2, and the two second channels 212 are arranged parallel to the axis of the rotating cylinder body 2, and the ports of the two second channels 212 sections close to the base 1 are sealed with glue. A first through hole 23 perpendicular to the second channel 212 is provided on the side wall of the second channel 212. To match the fluid inlet 12 and the fluid outlet 13, the two first through holes 23 are also symmetrically distributed at 180° on the side wall of the rotating cylinder body 2. During the rotation of the rotating cylinder body 2, the two first through holes 23 are alternately connected with the fluid inlet 12 and the fluid outlet 13. When the fluid inlet 12 is transferred to the first through hole 23 connected thereto, the fluid flows from the fluid inlet 12 to the first through hole 23 connected thereto, and then flows into the first channel 211 through the second channel 212 connected thereto, the piston 3 in the first channel 211 moves, and the fluid gradually fills the first cavity section. When the fluid outlet 13 is transferred to the first channel 211, the fluid flows from the second channel 212 connected thereto, and then flows into the fluid outlet 13 through the first through hole 23 connected thereto, the piston 3 in the first channel 211 moves, and the fluid gradually empties from the first cavity section.

[0041] In one embodiment, Figure 3 , Figure 4 and Figure 6As shown, the shape of the rotating cylinder body 2 is a cross, including a first rotating part 24 and a second rotating part 25, the first channel 211 is located in the first rotating part 24, the second channel 212 is located in the second rotating part 25, and a sealing ring 4 is sleeved on the outer side of the second rotating part 25. The sealing ring 4 is provided with two second through holes 41, and the two first through holes 23 are connected to the fluid inlet 12 and the fluid outlet 13 respectively through the two second through holes 41. In this embodiment, the horizontal part of the cross-shaped rotating cylinder body 2 is the first rotating part 24, and the vertical part is the second rotating part 25. The first through hole 23 is located on the second rotating part 25. The second rotating part 25 is installed on the base 1, and a sealing ring 4 is sleeved on the outer side of the second rotating part 25. The sealing ring 4 is provided with two second through holes 41 distributed symmetrically at 180°, which connect the first through hole 23 with the fluid inlet 12 and the fluid outlet 13. At the same time, the sealing ring 4 is located between the second rotating part 25 and the fluid inlet 12 and the fluid outlet 13. The rotation of the second rotating part 25 drives the first rotating part 24 to rotate at the same time. The sealing ring 4 is fixedly connected to the base 1, and the two second through holes 41 are respectively connected to the fluid inlet 12 and the fluid outlet 13, so that two first through holes 23 are formed in the rotation process and are alternately connected with the two second through holes 41, thereby ensuring the stability, that is, the sealing performance, of the rotating cylinder body 2 set on the base 1.

[0042] In one embodiment, Figure 2 , Figure 3 and Figure 4 As shown, 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 the groove wall edges on both sides of the second groove 26 are constructed with sealing protrusion circumferential strips 27, two sealing blocks 28 are provided in the groove of the second groove 26, and 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, and a 360° groove connected to the first through hole 23 is formed on the outer wall of the second rotating part 25. Two sealing protrusion circumferential strips 27 are constructed on the side wall of the second rotating part 25 and are respectively located at the side wall edges of the second groove 26, which are used to seal the second groove 26 in the axial direction to prevent the fluid in the second groove 26 from overflowing. Two sealing blocks 28 are arranged in the second groove 26 to divide the second groove 26 into two 180° sub-grooves 261, and each sub-groove 261 corresponds to a first through hole 23. The two sub-grooves 261 are not connected to each other through the sealing block 28. The two sub-grooves 261 are alternately connected with the two second through holes 41 within a 360° range, that is, when one sub-groove 261 is connected with one second through hole 41 within a 180° range, the other sub-groove 261 is connected with another second through hole 41 within another 180° range.

[0043] In this embodiment, the first groove 11 has a 0° position, a 180° position and a 360° position along the rotation direction. At the 0° position, the volume of the fluid volume cavity formed by a piston 3 in the rotating cylinder body 2 and the first cavity section of the chamber 21 in which it is located is 0, that is, the discharge stroke has just been completed and the suction stroke is about to begin. The first cavity section of another chamber 21 of the rotating cylinder body 2 is at the 180° position, and the volume of the fluid volume cavity has just completed the suction stroke and reached the maximum, and the discharge stroke is about to begin. At the 0° position, the sealing block 28 in the second groove 26 just blocks the second through hole 41 on the sealing ring 4, and the fluid inlet 12 and the fluid outlet 13 are both in a blocked state. During the rotation of the rotating cylinder body 2 from the 0° position to the 180° position, one chamber 21 of the rotating cylinder body 2 enters the suction stroke, and the sub-groove 261 where the first through hole 23 corresponding to the chamber 21 is located is connected to the fluid inlet 12, and the fluid enters the first cavity section of the chamber 21 in the suction stroke; while the other chamber 21 enters the discharge stroke, and the sub-groove 261 where the first through hole 23 corresponding to the chamber 21 is located is connected to the fluid outlet 13, and the fluid in the first cavity section of the chamber 21 enters the discharge stroke. At the 180° position, the sealing block 28 in the second groove 26 just blocks the second through hole 41 on the sealing ring 4 again, and the fluid inlet 12 and the fluid outlet 13 are both in a blocked state again. During the rotation of the rotating cylinder body 2 from the 180° position to the 360° position, the suction stroke and discharge stroke of the rotating cylinder body 2 from the 0° position to the 180° position are repeated. When the rotating cylinder body 2 rotates to the 360° position, the two pistons 3 each complete an suction and discharge stroke. When the rotating cylinder 2 is continuously rotating, the reciprocating suction and discharge of the fluid is realized, and the suction and discharge are equal, thereby realizing the continuous and linear flow delivery of the fluid.

[0044] In one embodiment, Figure 1 and Figure 4 As shown, the rotary cylinder 2 also includes a driving part 29, which is coaxially arranged with the second rotating part 25, and a sleeve 291 connected to the output shaft of the driving control component 7 is arranged inside the driving part 29. The rotary cylinder 2 is cross-shaped, the vertical part located below the horizontal part is the second rotating part 25, and the part located above the horizontal part is the driving part 29. The driving part 29 is cylindrical, but not connected with the second rotating part 25. A sleeve 291 is arranged on the inner wall of the driving part 29. In this embodiment, the sleeve 291 is an inner hexagonal sleeve, and the driving control component 7 can use a motor, and the output shaft is an inner hexagonal shaft, which is matched and connected with the inner hexagonal sleeve, and the rotary cylinder 2 is driven to rotate around the axis following the motor.

[0045] like Figure 1 , Figure 2 and Figure 5As shown, the conveying metering device of the embodiment of the present invention further includes a housing 8 and a cover 9, one end of the housing 8 is arranged around the edge of the base 1, and the cover 9 is buckled on the other end of the housing 8, and the cover 9 is provided with a mounting hole 91, and the driving part 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 the form of a pipeline, and the driving part 29 of the rotating cylinder 2 is connected to the external driving control component 7 through the mounting hole 91 of the cover 9. After the cover 9 is buckled on the housing 8, the core components of the base 1 and the rotating cylinder 2 are surrounded to achieve the effect of compact connection and protection.

[0046] In one embodiment, Figure 1 and Figure 5 As shown, the housing 8 and the cover 9 are connected by a snap-fitting portion 10. The housing 8 and the cover 9 are connected in a snap-fitting manner, and the snap-fitting portion 10 includes a buckle and a slot, which can be correspondingly arranged on the housing 8 or the cover 9. In this embodiment, the slot is arranged on the housing 8, and the buckle is arranged on the cover 9. When the cover 9 is buckled to the housing 8, the buckle is embedded in the slot to achieve the connection between the cover 9 and the housing 8. In other embodiments, the housing 8 and the cover 9 can also be connected in the form of threads or fasteners.

[0047] In one embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a sealing ring 32 is sleeved on one end of the piston 3 close to the axis. The piston 3 is sealed with the inner wall of the chamber 21 where it is located through the sealing ring 32 to prevent the fluid in the fluid volume cavity from leaking through the gap between the piston 3 and the inner wall of the chamber 21 during the movement of the piston 3, thereby ensuring the sealing of the first chamber section.

[0048] In one embodiment, the delivery meter 101 is made of plastic, silicone or rubber. All components of the delivery meter are made of plastic, silicone or rubber, and are molded by one-time injection molding without precision machining, which can reduce costs and achieve application requirements such as continuous linear flow, high precision, low shear, and sterility.

[0049] In another embodiment, Figure 8As shown, the outer side of the second rotating part 25 is not sleeved with a sealing ring 4, the second rotating part 25 is provided with a concave cavity, the second channel 212 is constructed by a dynamic sealing pad 103 and a dynamic ceramic plate 104, the dynamic sealing pad 103 is provided with two first flow holes 1031, the dynamic ceramic plate 104 is provided with a third groove and two opposite arc grooves 1042, the two arc grooves 1042 are not connected to each other, and are connected to the third groove through the second flow holes 1041 respectively, the dynamic sealing pad 103 is embedded in the third groove, the two first flow holes 1031 are connected to the two arc grooves 1042 through the two second flow holes 1041 respectively, and one end of the dynamic ceramic plate 104 provided with the third groove is embedded in the concave cavity, thereby forming two second channels 212. During the rotation of the second rotating part 25, the dynamic ceramic plate 104 and the dynamic sealing pad 103 rotate synchronously with it. The second channel 212 is connected with the fluid inlet 12 and the fluid outlet 13 through the static ceramic plate 106 and the static sealing gasket 105. The static sealing gasket 105 is provided with two third flow holes 1051. The static ceramic plate 106 is provided with a fourth groove and a fourth flow hole 1061 connected with the fourth groove. The two fourth flow holes 1061 are respectively connected with the fluid inlet 12 and the fluid outlet 13. The static sealing gasket 105 is embedded in the fourth groove. The two third flow holes 1051 are connected with the two fourth flow holes 1061. The static ceramic plate 106 is arranged corresponding to the dynamic ceramic plate 104, and the two arc-shaped grooves 1042 can be connected with the two fourth flow holes 1061 in turn, so that the two second channels 212 are alternately connected with the fluid inlet 12 and the fluid outlet 13.

[0050] like Figure 1 and Figure 7 As shown, an embodiment of the present invention further provides an infusion device, including a drive control component 7 and a conveying component, the conveying component includes a liquid source 5, an output component 102 and a conveying meter 101 as in the above embodiment, the liquid source 5 is connected to the fluid inlet 12 and the fluid outlet 13 is connected to the output component 102 through a pipeline 6, and the output shaft of the drive control component 7 is connected to the driving part 29 of the rotating cylinder body 2.

[0051] In the infusion device of the embodiment of the present invention, the fluid flows from the liquid source 5 to the delivery meter 101 through a section of pipeline 6, and is delivered to the output member 102 through another pipeline 6 after being measured and distributed by the delivery meter 101, thereby reaching the receiving end. Through the combination of the output meter and the drive control component 7, the motor of the drive control component 7 is connected to the drive part 29 of the rotating cylinder 2, and the central controller of the drive control component 7 provides instructions to control the rotation speed and rotation angle of the motor to achieve the fluid delivery flow rate and delivery accuracy.

[0052] When the motor stops rotating, the delivery metering device 101 stops working. Due to the existence of friction resistance, the rotating cylinder 2 will not rotate by itself, and there will be no suction and discharge of fluid. Similarly, since the motor overcomes the friction resistance to output power to produce this suction and discharge stroke, this process is not affected by the back pressure. When the back pressure changes, the amount of suction and discharge remains fixed.

[0053] The volume of the fluid volume chamber is known according to the design, and the amount of fluid sucked in and discharged can be accurately controlled by the number of rotations of the motor. Different flow rates can be achieved by controlling the speed of the motor rotation, and the speed of the motor is very easy to control, that is to say, it is easy to achieve a wide range of flow rates. The infusion flow rate can be controlled by controlling the rotation angle or the minimum step angle of the motor. At the same time, changing the volume of the fluid volume chamber can also achieve different infusion precision controls to meet different application scenarios. The application of the present invention is not limited to large-capacity infusion pumps in the medical field, and can also be applied to the delivery of intermediate-capacity and small-capacity fluid drugs represented by electronic analgesic pumps and micro-subcutaneous insulin pumps.

[0054] For example, in the field of micro-infusion of insulin, the infusion of insulin is required to be at the ul level. Assuming that the volume of the fluid volume chamber of the present invention is 10ul, and 10ul of insulin is discharged when the motor rotates 180°, the stepping subdivisions of known stepper motors are 1, 2, 4, 8, 16, 32, 64, and 128. If an 8-part motor is used, the minimum stepping amount is 10 / 180 / 8=0.007ul, which is not easy to achieve with other pump bodies at present.

[0055] When the present invention is used as a large-capacity infusion pump, the drive control component 7 includes a central controller, a motor and a controller, an air detector and a pressure sensor, a power management, a display and a keyboard, an alarm unit, data transmission, etc., using known general technologies. There will be additions and subtractions of functional modules in other infusion areas, such as the field of electronic analgesia pumps and the field of micro-subcutaneous infusion represented by insulin pumps, and appropriate adjustments will be made according to the different needs of actual clinical applications.

[0056] The insulin pump manufactured by the present invention can use insulin primary packaging, and does not need to be refilled into a rigid container. It only needs to use the insulin in the primary packaging as the liquid source 5 to connect the fluid channel of the present invention, which brings convenience of use and cost savings.

[0057] When in use, the present invention is not limited to the field of medical equipment, and the fluid is not limited to fluid medicine, but can be other fluids that need to be delivered and measured. The receptor is not limited to the human body, but can be other containers or other recipients. The combination of the delivery meter 101 and the drive control component 7 is in various forms, which can be the current portable installation method or other methods. According to different needs, the delivery meter 101 and the drive control component 7 can also be provided at one time. The drive control component 7 is not limited to the motor as the power source, and other power systems can also be used, such as solenoids, nickel-titanium alloys, voice coil brakes, piezoelectric motors, etc. The output member 102 can also be an injection needle or other injection structure.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A conveying meter, characterized in that: The invention comprises a base, a rotating cylinder body and two pistons, wherein the rotating cylinder body comprises two chambers arranged with its axis as a symmetric axis, each of the chambers comprises a first chamber section and a second chamber section arranged in sequence in a direction away from the axis, the first chamber section is used to contain a fluid, the second chamber section is configured with a notch, the two pistons are respectively located in the two chambers, and the two pistons are respectively provided with a driving rod, the base is provided with a first groove, the driving rod passes through the notch to enter the first groove, and moves along the first groove along a cam profile, and the axis passes through the center of a base circle of the cam profile; a fluid inlet and a fluid outlet arranged along the center line of the cam profile are provided inside the base, and the fluid inlet and the fluid outlet are respectively connected with the two first chamber sections; the first chamber section comprises a first channel and a second channel which are perpendicular to each other and connected, the side walls of the two second channels are respectively provided with a first through hole, and the two second channels are respectively connected with the fluid inlet and the fluid outlet through the first through holes corresponding to each other; a sealing ring is sleeved on one end of the piston close to the axis.

2. The conveying meter according to claim 1, characterized in that: The rotating cylinder body is in a cross shape and includes a first rotating part and a second rotating part. The first channel is located in the first rotating part, and the second channel is located in the second rotating part. A sealing ring is sleeved on the outer side of the second rotating part. Two second through holes are provided on the sealing ring. The two first through holes are connected to the fluid inlet and the fluid outlet respectively through the two second through holes.

3. The conveying meter according to claim 2, characterized in that: The outer wall of the second rotating part is provided with a circumferentially surrounding second groove, the first through hole is located in the second groove, and the groove wall edges on both sides of the second groove are constructed with sealing protrusion circumferential strips, two sealing blocks are provided in the groove of the second groove, the second groove is divided into two sub-grooves by the two sealing blocks, and the two first through holes are respectively located in the two sub-grooves.

4. The conveying meter according to claim 2, characterized in that: The rotating cylinder body further comprises a driving part, the driving part is coaxially arranged with the second rotating part, and a sleeve connected to the output shaft of the driving control component is arranged inside the driving part.

5. The conveying meter according to claim 4, characterized in that: It also includes a shell and a cover body, one end of the shell is arranged around the edge of the base, and the cover body is buckled on the other end of the shell, and the cover body is provided with a mounting hole, and the driving part is inserted into the mounting hole.

6. The conveying meter according to claim 5, characterized in that: The shell and the cover are connected via a clamping portion.

7. The conveying meter according to any one of claims 1 to 6, characterized in that: The conveying meter is made of plastic, silica gel or rubber material.

8. An infusion device, characterized in that: It includes a driving control component and a conveying component, wherein the conveying component includes a liquid source, an output component and a conveying meter as described in any one of claims 1 to 7, the liquid source and the fluid inlet, as well as the fluid outlet and the output component are connected through pipelines, and the output shaft of the driving control component is connected to the driving part of the rotating cylinder body.

Images