WO2020233689A1

WO2020233689A1 - Infusion device

Info

Publication number: WO2020233689A1
Application number: PCT/CN2020/091662
Authority: WO
Inventors: 孙灿; 詹世涛
Original assignee: 上海微创生命科技有限公司
Priority date: 2019-05-22
Filing date: 2020-05-21
Publication date: 2020-11-26
Also published as: CN111973841A

Abstract

An infusion device. A pushing rod (120) and a transmission unit (200) are axially movably connected to each other, and are used for driving a piston (140) to move to a liquid medicine infusion end (110A), and the pushing rod (120) can be dismounted from the transmission unit (200). On this basis, after all liquid medicine has been infused, the piston (140) and the pushing rod (120) can be replaced together with a liquid storage unit (100), thereby avoiding the problem of poor infusion accuracy caused by wear of a component such as the piston (140) after long-term use; moreover, after the liquid storage unit (100) is replaced, only a circumferential reset operation needs to be performed on the transmission unit (220), thereby relieving wear of the transmission unit (220) and a driving unit (800), reducing the power consumption of the driving unit (800), and prolonging the service life of the driving unit (800).

Description

Infusion equipment

Technical field

The invention relates to the technical field of medical supplies, in particular to an infusion device.

Background technique

Infusion equipment is one of the most commonly used supplies in the medical field, used to achieve the infusion of liquid medicine. In order to enable more precise and uniform infusion of the liquid medicine, a mechanical pump is generally used to control the number of drops of the liquid medicine or the flow rate of the liquid medicine to ensure that the liquid medicine can enter the patient's body safely at a uniform speed, accurate and safe.

For example, the existing insulin infusion equipment with a reservoir generally has a plunger-type liquid storage unit, that is, the liquid storage unit includes an inner cavity that contains the insulin liquid and a drug delivery piston. During infusion, manually input the required infusion volume through the buttons, and drive the motor to rotate through the drive signal sent by the controller. The motor drives the output end push rod in the transmission structure in a mechanical transmission manner, and the push rod pushes the liquid storage unit to The medicine piston performs insulin infusion. In the above transmission process, the controller controls the insulin liquid output to infusion required by the patient according to the read encoder rotation value. After the insulin liquid in the liquid storage unit is used up, it is necessary to reset the transmission structure and the piston, and then replace the new liquid storage unit.

However, for insulin infusion equipment, it requires high infusion accuracy, and the minimum step is about 1U (that is, 0.01ml). However, as the traditional infusion equipment is used, the components of the transmission unit are worn out, which will further affect the infusion accuracy of the infusion equipment (for example, the infusion dose will be difficult to accurately adjust). In addition, insulin infusion is a continuous infusion, so insulin infusion devices are usually designed as portable devices with batteries. Existing infusion equipment requires a reset operation when replacing the liquid storage unit. The piston push rod moves in the opposite direction to the initial position. The required reset time is generally 1 minute to 2 minutes depending on the motor speed of each product. Wait. Therefore, the reset process will inevitably produce a large power consumption, which will consume a large amount of effective battery time of the insulin infusion device.

Summary of the invention

The purpose of the present invention is to provide an infusion device to solve the problems of poor infusion accuracy due to wear of parts and components in the existing infusion device, and large reset power consumption of the infusion device.

In order to solve the above technical problems, the present invention provides an infusion device, including:

Drive unit;

A liquid storage unit, the liquid storage unit includes a liquid storage housing, a piston and a push rod, the liquid storage housing includes a through inner cavity and an open end and a liquid medicine output end respectively located at both ends of the inner cavity. A movable seal of the piston is accommodated in the inner cavity, the push rod abuts against the piston, and the push rod can rotate relative to the liquid storage housing while still relative to the The liquid storage housing moves axially to drive the piston to move to the liquid medicine output end; and,

A transmission unit, which is movably connected to the push rod in an axial direction, and can drive the push rod to rotate in a circumferential direction under the drive of the drive unit.

Optionally, the push rod is threadedly connected with the liquid storage housing at the open end of the liquid storage housing, so that when the push rod can rotate in the circumferential direction, it is also along the axial direction of the liquid storage housing. mobile.

Optionally, the push rod has an inner hole extending along the axial direction, the transmission unit includes a drive shaft, and the distal end of the drive shaft is inserted into the inner hole of the push rod and interacts with the The push rod is fixed circumferentially.

Optionally, the drive shaft has a prismatic structure, and the inner hole of the push rod is a polygonal cylindrical structure that matches the prismatic structure; or, the outer wall of the drive shaft has protrusions, and The push rod further has a groove communicating with the inner hole, and the protrusion of the drive shaft and the groove of the push rod engage with each other.

Optionally, the axis of the drive shaft coincides with the axis of the push rod.

Optionally, the liquid storage housing further includes a connection kit provided at the open end, the connection kit including a first sleeve and a second sleeve connected to the first sleeve, the first sleeve and The open end of the liquid storage housing is fixedly connected, and the second sleeve is threadedly connected with the push rod.

Optionally, the first sleeve and the open end are threaded, buckled, glued or melted.

Optionally, the inner wall of the open end is provided with internal threads, and the outer wall of the push rod is provided with external threads that match the internal threads on the open end, so as to realize the threads of the push rod and the open end. connection.

Optionally, the transmission unit further includes a gear set, the gear set includes a first gear and a second gear, the first gear is connected to the output shaft of the drive unit, and the central shaft of the second gear It is coaxially connected with the drive shaft, and the first gear drives the second gear to rotate.

Optionally, the gear set further includes a third gear, a fourth gear and a fifth gear, the first gear is externally meshed with the third gear, and the third gear is externally meshed with the fourth gear, And the fourth gear and the fifth gear are coaxially arranged, and the fifth gear is externally meshed with the second gear.

Optionally, the transmission ratio of the gear set is (3:1) to (7:1).

Optionally, the infusion device further includes a control unit, and the drive unit includes a motor, and the control unit is configured to generate a theoretical number of rotations corresponding to the motor to control the rotation of the motor.

Optionally, the infusion device further includes an encoder, the encoder is arranged on the motor and used to obtain the actual number of rotations of the motor, and the encoder is also communicatively connected with the control unit To feed back the actual number of rotations of the motor to the control unit.

Optionally, the infusion device further includes an input unit for inputting infusion information, the input unit is communicatively connected with the control unit, and the control unit is based on the infusion information and the The transmission ratio of the transmission unit generates a theoretical number of revolutions corresponding to the motor.

Optionally, the infusion device further includes a box body, the driving unit and the transmission unit are fixedly installed in the box body, and the liquid storage unit is detachably installed in the box body.

Optionally, a containing hole is provided in the box body, and the containing hole is configured to contain the liquid storage unit and restrict the circumferential rotation of the liquid storage unit.

Optionally, the infusion device further includes an infusion set connector, which is detachably connected to the box body at the opening of the containing hole, and the infusion set connector also abuts and holds The liquid storage unit in the receiving hole is used to restrict the axial movement of the liquid storage unit.

Optionally, the infusion device further includes a first wireless communication unit, and an input component separated from the housing; wherein,

The first wireless communication unit is arranged in the box body and is in communication connection with the control unit;

The input component includes an input unit and a second wireless communication unit. The input unit is used to input infusion information and is in communication connection with the second wireless communication unit. The first wireless communication unit is connected to the second wireless communication unit. Communication unit wireless communication connection;

And, the control unit generates a theoretical number of rotations corresponding to the motor according to the infusion information and the transmission ratio of the transmission unit.

Correspondingly, the present invention also provides a liquid storage unit for infusion equipment. The liquid storage unit includes a liquid storage housing, a piston, and a push rod. The liquid storage housing includes a through inner cavity and is respectively located at The open ends at both ends of the inner cavity and the liquid medicine output end, the piston is movably sealed and contained in the inner cavity, the push rod abuts against the piston, and the push rod can be moved relative to the While the liquid storage housing rotates circumferentially, it also moves axially relative to the liquid storage housing to drive the piston to move to the liquid medicine output end.

In addition, the present invention also provides a control unit for controlling the above-mentioned liquid storage unit to realize the circumferential rotation of the push rod in the liquid storage unit, and the control unit includes:

Drive unit; and,

In the infusion device provided by the present invention, the push rod of the liquid storage unit and the transmission unit are axially movably connected, that is, the push rod of the liquid storage unit and the transmission unit are not fixedly connected, thereby achieving The liquid storage unit, the piston and the push rod can be separated from the transmission unit and the driving unit for driving the transmission unit. Based on this, after all the liquid medicine is discharged from the liquid storage unit, the piston, push rod and other components can be replaced together with the liquid storage unit, avoiding the problem of wear of the piston and other components after long-term use that affects its infusion accuracy.

Furthermore, based on the fact that the transmission unit in the present invention only rotates circumferentially without moving axially, after the current liquid storage unit discharges all the liquid medicine, the transmission unit only needs to perform a circumferential reset operation without performing an axial reset operating. In this way, the wear and power consumption of the transmission unit and the drive unit can be effectively reduced, and the service life of the transmission unit and the drive unit can be prolonged.

Description of the drawings

Figure 1 is a schematic structural diagram of an infusion device in an embodiment of the present invention;

2 is a schematic diagram of the structure of the infusion device in an embodiment of the present invention during its infusion;

Figure 3a is a schematic cross-sectional view of a push rod and a drive shaft of the infusion device in an embodiment of the present invention perpendicular to the axial direction;

Figure 3b is a schematic cross-sectional view of another push rod and drive shaft of the infusion device in an embodiment of the present invention perpendicular to the axial direction;

Fig. 3c is a schematic cross-sectional view of another push rod and drive shaft of the infusion device in an embodiment of the present invention perpendicular to the axial direction;

4 is a schematic structural diagram of the transmission unit of the infusion device in an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of the box body of the infusion device in an embodiment of the present invention.

Among them, the reference signs are as follows:

100-liquid storage unit;

110-liquid storage shell;

110A- liquid medicine output terminal;

120-Putter;

130-Connecting kit;

130A-first casing;

130B-Second bushing;

140-piston;

200- transmission unit;

210-drive shaft;

210A- convex;

230- gear set;

231-The first gear;

232-second gear;

233-The third gear;

234-The fourth gear;

235-The fifth gear;

300-control unit;

400-encoder;

500-input unit;

600-box body;

700-display unit;

800-drive unit;

900-infusion set connector.

Detailed ways

The infusion device proposed by the present invention will be further described in detail below with reference to the drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and all use imprecise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

In this embodiment, the liquid medicine stored in the liquid storage unit 100 in the infusion device is insulin liquid medicine, that is, the infusion device is used to control hyperglycemia, for example.

Fig. 1 is a schematic structural diagram of an infusion device in an embodiment of the present invention, and Fig. 2 is a schematic structural diagram of an infusion device in an embodiment of the present invention during its infusion. As shown in FIG. 1 and FIG. 2, in this embodiment, the infusion device includes:

The liquid storage unit 100 includes a liquid storage housing 110, a push rod 120, and a piston 140; wherein the liquid storage housing 110 has a through inner cavity and open ends located at both ends of the inner cavity And the liquid medicine output port 110A; the piston 140 is movably sealed and contained in the inner cavity; the push rod 120 abuts the piston 140 and rotates in the circumferential direction relative to the liquid storage housing 110 At the same time, the push rod 120 also moves axially relative to the liquid storage housing 110 to drive the piston 140 to move to the liquid medicine output end 110A;

Drive unit 800;

Transmission unit 200, one end of the transmission unit 200 is connected to the drive unit 800, and the other end of the transmission unit 200 is axially movably connected to the push rod 120, so that the transmission unit 200 is in the drive Driven by the unit 800, the push rod 120 is driven to rotate in a circumferential direction.

That is, the driving unit 800 and the transmission unit 200 serve as a control unit, and the driving unit 800 drives the transmission unit 200 to further drive the push rod 120 to rotate in the circumferential direction through the transmission unit 200, so that the push rod 120 rotates in the circumferential direction. At the same time, it can move axially along the liquid storage housing 110, so that the insulin liquid in the liquid storage housing 110 can be delivered from the liquid medicine output end 110A of the liquid storage housing 110. In a preferred embodiment, the driving unit 800 includes a motor and an energy provider.

In this embodiment, the push rod 120 and the liquid storage housing 110 can be threadedly connected at the open end of the liquid storage housing. In this way, the push rod 120 can move axially along the liquid storage housing 110 when the push rod 120 rotates in the circumferential direction under the restriction of the screw fit. In this embodiment, there is no particular limitation on the specific implementation manner in which the push rod 120 can move axially along the liquid storage housing 110 when the push rod 120 rotates in the circumferential direction, and it can also be implemented by means such as a worm gear.

It should be noted that since the transmission unit 200 and the push rod 120 are axially movably connected along the axial direction of the push rod, that is, the transmission unit 200 and the push rod 120 are axially non-axial. The connection is fixed so that the push rod 120 can be detached from the transmission unit 200. Equivalently, the liquid storage unit 100 is detachably connected to the transmission unit 200 and the drive unit 800. In this way, on the one hand, after the liquid storage unit 100 discharges all the insulin liquid, the push rod 120, piston 140 and other components can be replaced together with the liquid storage unit 100, which solves the problem that the piston and other components in the existing infusion equipment cannot Replacement, after long-term use, there is a problem of wear and tear leading to deviations in infusion accuracy; on the other hand, it alleviates the existing infusion equipment "after the insulin liquid in the liquid storage unit is discharged, replace with a new insulin In the case of the liquid storage unit of the liquid medicine, the transmission unit needs to perform a long-term reset operation" and other problems. That is, in this embodiment, the reset operation performed by the transmission unit 200 is simpler, and only requires a circumferential reset and no axial Reset, which helps to reduce the reset time. However, simple reset and less time can reduce the wear of the motor and the transmission unit 200, maintain the infusion accuracy, and can increase the service life of the energy provider, and the single energy supply time can be prolonged.

Continuing to refer to FIG. 1, in this embodiment, the transmission unit 200 includes a drive shaft 210 to use the drive shaft 210 to drive the push rod 120 to rotate in a circumferential direction.

Specifically, the push rod 120 has an inner hole extending along the axial direction, the distal end of the drive shaft 210 of the transmission unit 200 is inserted into the inner hole of the push rod 120, and the drive The shaft 210 is circumferentially fixed to the push rod 120 through the inner hole, so that when the drive shaft 210 rotates in the circumferential direction, it can simultaneously drive the push rod 120 to rotate in the circumferential direction.

Figure 3a is a schematic cross-sectional view of a push rod and a drive shaft of the infusion device in an embodiment of the present invention perpendicular to the axial direction, and Figure 3b is another push rod of the infusion device in an embodiment of the present invention. A schematic cross-sectional view of the rod and the drive shaft perpendicular to the axial direction. Fig. 3c is a schematic cross-sectional view of another push rod and the drive shaft of the infusion device in an embodiment of the present invention perpendicular to the axial direction. 1 and 3a to 3c, the shape and size of the drive shaft 210 match the shape and size of the inner hole of the push rod 120.

In an optional solution, the drive shaft 210 has a prismatic structure, and the inner hole of the push rod 120 has a polygonal cylindrical structure matching the prismatic structure and size, so that the drive shaft 210 And the push rod 120 is fixed circumferentially. 3a, the drive shaft 210 is, for example, a triangular prism-shaped structure, and the inner hole of the push rod 120 is a triangular cylindrical structure correspondingly, that is, the inner hole of the drive shaft 210 and the push rod 120 The cross-sectional shape of the hole perpendicular to the axial direction is correspondingly triangular; or, as shown in FIG. 3b, the driving shaft 210 is, for example, a quadrangular prism-shaped structure, and the inner hole of the push rod 120 is correspondingly a quadrilateral cylindrical shape. The structure, that is, the cross-sectional shapes of the drive shaft 210 and the inner hole of the push rod 120 perpendicular to the axial direction are correspondingly quadrangular. Alternatively, the drive shaft 210 may also be another polygonal prism-shaped structure, which will not be repeated here.

Of course, in other optional solutions, the drive shaft 210 and the push rod 120 can also be locked in a circumferential direction. For example, as shown in FIG. 3c, the outer wall of the drive shaft 210 has a protrusion 210A extending in the radial direction, and the push rod 120 also has a recess that communicates with the inner hole and is recessed in the radial direction. The groove corresponds to the protrusion 210A. When the drive shaft 210 is inserted into the inner hole of the push rod 120, the protrusion 210A on the drive shaft 210 is engaged with the recess Slot on. In this way, it is avoided that the driving shaft 210 rotates circumferentially relative to the push rod 120. Further, the protrusion 210A on the drive shaft 210 extends axially along the outer wall of the drive shaft, for example, to present a strip-shaped structure. At this time, the groove of the push rod 120 also extends along the axial direction correspondingly to match the protrusion 210A of the strip structure.

Further, the axis of the drive shaft 210 coincides with the axis of the push rod 120, that is, the drive shaft 210 and the push rod 120 are arranged coaxially. In this way, the smoothness of the transmission process can be further improved and avoid Produce centrifugal phenomenon to achieve more precise drive control. In this embodiment, the axis of the inner hole of the push rod 120 can be made to coincide with the axis of the push rod 120, so that the drive shaft 210 and the push rod 120 are arranged coaxially.

As described above, in this embodiment, when the drive shaft 210 is used to drive the push rod 120 to rotate in the circumferential direction, the push rod 120 can be made to be able to rotate due to the screw fit at the open end of the liquid storage housing 110. Move along the axis. Therefore, when the push rod 120 rotates in the circumferential direction, the push rod 120 also moves axially relative to the drive shaft 210. It can be considered that the push rod 120 and the drive shaft 210 are axially movably connected through the inner hole of the push rod. For example, there is a clearance fit between the push rod 120 and the drive shaft 210, so that the push rod 120 can move axially relative to the drive shaft 210. Based on this, the inner wall of the inner hole of the push rod 120 and the outer surface of the drive shaft 210 may both be made of low-friction materials, so that the push rod 120 can move smoothly relative to the drive shaft 210.

Continuing to refer to Figures 1 and 2, in this embodiment, the liquid storage housing 110 further includes a connecting sleeve 130, which is arranged at the open end of the liquid storage housing 110 for making the The push rod 120 is connected to the open end of the liquid storage housing 110 through the connection kit 130. Specifically, the connection kit 130 includes a first sleeve 130A and a second sleeve 130B that are connected to each other, and the first sleeve 130A matches the open end of the liquid storage housing 110 to match the storage The open end of the liquid shell 110 is fixedly connected, and the second sleeve 130B is matched with the push rod 120 and is threadedly connected with the push rod 120.

Wherein, between the first sleeve 130A and the open end, for example, screw connection, snap connection, glue bonding or fusion bonding can be used to realize the fixation of the first sleeve 130A and the liquid storage housing 110. connection.

In this embodiment, the inner wall of the first sleeve 130A has internal threads, and the outer wall of the open end is provided with matching external threads, so that the first sleeve 130A can be sleeved on the open end. The periphery is threadedly connected with the outer wall of the open end. Or, in other solutions, the outer wall of the first sleeve 130A has, for example, an external thread, and the inner wall of the open end has a matching internal thread. In this case, the first sleeve 130A and the opening The inner wall of the end is fixedly connected by a screw member.

And, the inner wall of the second sleeve 130B is provided with an internal thread, the outer wall of the push rod 120 is provided with an external thread, and the second sleeve 130B is sleeved on the periphery of the push rod 120 to make The second sleeve 130B is threadedly connected to the outer wall of the push rod 120. In addition, the push rod 120 can rotate in a circumferential direction relative to the second sleeve 130B, and the push rod 120 can be moved axially under the restriction of screw fitting.

It should be noted that, in this embodiment, the push rod 120 is threadedly connected to the open end of the liquid storage housing 110 through a connection kit 130. However, in other embodiments, the push rod 120 may also be directly connected to the open end of the liquid storage housing 110, for example, an internal thread is provided on the inner wall of the open end, and the push rod 120 The outer wall is provided with an external thread matching the internal thread on the open end, so as to realize the direct thread connection of the push rod 120 and the open end. More specifically, the internal thread provided on the open end can be made to protrude from the inner wall of the open end.

Continuing to refer to FIGS. 1 and 2, the piston 140 is movably arranged in the liquid storage housing 110, and the shape and size of the piston 140 are consistent with the shape of the inner cavity of the liquid storage housing 110 And the size is matched, so that the piston 140 can seal against the inner wall of the liquid storage housing 110. Furthermore, the outer side of the piston 140 is also provided with a silicone ring, the diameter of the silicone ring is slightly larger than the diameter of the inner cavity, so as to further improve the sealing performance between the piston 140 and the inner cavity.

And, the piston 140 also abuts against the push rod 120. Specifically, the end of the piston 140 away from the liquid medicine output end 110A of the liquid storage housing abuts against the push rod 120, so that when the push rod 120 moves axially, the push rod 120 can drive the The piston 140 moves axially. The abutment mentioned here may be a separable connection between the two, or a fixed connection between the ends of the two. For example, when the infusion device is infusing insulin liquid medicine, the push rod 120 pushes the piston 140 so that the piston 140 moves toward the liquid medicine output end 110A, so that the liquid storage housing The insulin liquid in the body 110 is discharged from the liquid output port 110A.

Continuing to refer to FIGS. 1 and 2, the transmission unit 200 further includes a gear set 230. The gear set 230 in this embodiment will be described in detail below with reference to the accompanying drawings.

4 is a structural diagram of the gear set of the infusion device in an embodiment of the present invention. As shown in FIG. 4, the gear set 230 includes a first gear 231 and a second gear 232. The first gear 231 is connected with the second gear 232 by means of external meshing. Wherein, the first gear 231 is connected with the output shaft of the motor of the drive unit 800 (specifically, the central shaft of the first gear 231 can be coaxially connected with the output shaft of the motor); the second gear The central shaft of 232 is coaxially connected with the driving shaft 210 to use the first gear 231 to drive the second gear 232 to rotate, thereby driving the driving shaft 210 to rotate.

In this embodiment, the first gear 231 is a small gear relative to the second gear 232, and the second gear 232 is a large gear relative to the first gear 231. Accordingly, the use of a small gear (ie , The first gear 231) drives the transmission mode of the large gear (ie, the second gear 232), which is beneficial to achieve a larger reduction ratio and improve the control accuracy of the drive shaft 210. Further, the transmission ratio of the gear set 230 is, for example, (3-7):1, that is, the transmission ratio of the gear set 230 is, for example, (3:1) to (7:1), which is equivalent to using the The gear set 230 can realize that the transmission ratio of the transmission unit 200 is, for example, (3-7):1. Since the transmission speed of the driving wheel at the start end of the transmission unit 200 is greater than the transmission speed of the driven wheel at the end, it is beneficial to improve the counter thrust The control of the driving speed of the rod 120 is precise.

Further, the second gear 232 is coaxially arranged at the proximal end of the drive shaft 210 to drive the drive shaft 210 to rotate in a circumferential direction, and the distal end of the drive shaft 210 is inserted into the push rod 120 . Wherein, the proximal end and the distal end of the driving shaft 210 are opposite ends.

It should be noted that the number of gears in the gear set 230 can be adjusted according to actual conditions. For example, at least one gear can be added between the first gear 231 and the second gear 232 to further adjust the gear ratio of the first gear 231 and the second gear 232 in the gear set 230 to solve the problem of the size of the infusion equipment. Space constraints.

4, in this embodiment, the gear set 230 has 5 gears as an example for explanation, the 5 gears are the first gear 231, the second gear 232, the third gear 233, For the fourth gear 234 and the fifth gear 235, the axes of the five gears are parallel or collinear with each other.

Wherein, the first gear 231 is coaxially fixed on the output shaft of the motor, the first gear 231 is externally meshed with the third gear 233, the third gear 233 is externally meshed with the fourth gear 234, and the The fourth gear 234 and the fifth gear 235 are coaxially arranged, and the fifth gear 235 is externally meshed with the second gear 232.

It should be realized that FIG. 4 only schematically shows the structure of a gear set 230 in this embodiment. In other embodiments, only the first gear 231 and the second gear 232 may be provided, and the first gear 231 and the second gear 232 may be externally meshed; or, it may be between the first gear 231 and the second gear 232. Only a fourth gear and a fifth gear are added in between, and the first gear 231 is externally meshed with the fourth gear, the fourth gear and the fifth gear are coaxially arranged, and the fifth gear 235 and the second gear 232 external gearing.

That is, the setting of the gears in the gear set 230 can be adjusted according to actual requirements, for example, the gears can be set correspondingly according to the transmission ratio to be achieved by the gear set 230.

Further, the motor in the driving unit 800 is used to generate driving force, and then the push rod 120 is driven by the transmission unit 200 to rotate in a circumferential direction. It should be noted that in practical applications, a suitable motor can be selected according to parameters such as power and transmission ratio. Wherein, the motor may be a DC reduction motor, such as a gear reduction motor. The energy provider in the driving unit 800 may be an electrochemical storage system (for example, an alkaline battery, a lithium battery), or an electric storage system (for example, a super capacitor).

Continuing to refer to Figs. 1 and 2, the infusion device further includes a control unit 300 for controlling the rotation of the motor. Wherein, the control unit 300 is, for example, a single-chip microcomputer chip, PLC, FPGA or microprocessor.

In addition, the control unit 300 can also be used to receive infusion information, the infusion information including, for example, the infusion time, the amount of infusion each time, and the concentration of the liquid medicine in the liquid storage unit 100. And, the control unit 300 can further combine the infusion information such as the amount of infusion each time and the concentration of the liquid storage unit 100 and the transmission ratio of the transmission unit to generate a theoretical rotation number corresponding to the motor . Further, the control unit 300 can also determine when to drive the motor to rotate according to the infusion time.

In this embodiment, the infusion device further includes an input unit 500 for inputting the infusion information. And, the input unit 500 is further connected in communication with the control unit 300, so that the input infusion information can be transmitted to the control unit 300. Specifically, the input unit 500 includes, for example, input keys; or, the input unit 500 may also include a touch screen or the like.

Further, the infusion device further includes an encoder 400. The encoder 400 is arranged on the motor for obtaining the number of rotations of the motor, and is connected to the control unit 300 in communication to notify the control unit 300 of the actual number of rotations of the motor. Optionally, the encoder 400 may be, for example, a rotary encoder, and further, for example, an incremental rotary encoder may be used.

Specifically, the control unit 300 generates a theoretical number of rotations corresponding to the motor, and controls the activation of the motor in combination with the infusion time. The encoder 400 obtains the current number of rotations of the motor and generates feedback information, and then sends the feedback information to the control unit 300. At this time, the control unit 300 can combine the feedback information to generate corresponding information to control the shutdown of the motor. In this way, the purpose of real-time regulation can be achieved by the control unit 300.

Further, the infusion device further includes a box body, the liquid storage unit 100 is detachably installed in the box body, and the transmission unit 200 and the driving unit 800 are both arranged in the box body.

Figure 5 is a schematic structural diagram of the box body of the infusion device in an embodiment of the present invention. As shown in Figure 5, in this embodiment, the drive unit 800, the transmission unit 200, the control unit 300, and the The encoder 400 and the input unit 500 may both be fixedly arranged in the box 600, and the liquid storage unit 100 is detachably installed in the box 600. That is, after the infusion device completes the infusion, the liquid storage unit 100 can be directly removed and replaced with a new liquid storage unit storing insulin liquid. It should be recognized that when the liquid storage unit 100 that has been infused is replaced, the piston and push rod in the liquid storage unit 100 that have been infused are replaced accordingly.

In an optional solution, the box 600 is provided with a containing hole for containing the liquid storage unit 100, and the liquid storage unit 100 is also circumferentially snapped in the containing hole, that is, the containing hole The hole restricts the circumferential rotation of the liquid storage unit 100. Specifically, the outermost contour of the liquid storage unit 100 can be made into a prismatic structure (that is, the contour of the liquid storage unit 100, such as the liquid storage housing 110 and/or the connecting sleeve 130, which is in contact with the receiving hole is Prismatic structure), the receiving hole is correspondingly a polygonal cylindrical structure, so that the liquid storage unit 100 and the box 600 are circumferentially fixed, and then the driving unit 800 is used to drive the push rod 120 to rotate At this time, it can avoid driving the liquid storage housing 110 to rotate.

In this embodiment, the first sleeve 130A of the connection kit 130 protrudes from the liquid storage housing 110. Based on this, the outer contour of the first sleeve 130A can be configured as a prismatic structure. At this time, the outer contour of the liquid storage housing 110 may not be limited.

It should be noted that the liquid storage unit 100 described herein is circumferentially fixed relative to the box body 600, which means that the liquid storage unit 100 is circumferentially fixed relative to the box body 600. However, the storage Some components of the liquid unit 100 can rotate circumferentially relative to the liquid storage unit 100. For example, during the infusion of the liquid storage unit 100, the push rod 120 can still rotate circumferentially.

Further, the infusion device further includes an infusion set connector 900, and the infusion set connector 900 is used to restrict the axial movement of the liquid storage unit 100. Specifically, the infusion set connector 900 is detachably connected with the box body 600 at the opening of the receiving hole, for example, connected by a thread, a buckle, or the like. Further, after the liquid storage unit 100 is configured to complete mating with the box 600, the infusion set connector 900 is disposed at the opening of the receiving hole and is connected to the liquid medicine output end of the liquid storage unit 100 Abutting, in this way, restricts the axial movement of the liquid storage unit 100, specifically, restricts the axial movement of the liquid storage housing 110. And, when replacing the liquid storage unit 100 that has been infused, the infusion set connector 900 can be detached from the box 600 to further remove the infused liquid from the opening of the receiving hole The liquid storage unit 100.

Further, the infusion device injects the insulin liquid into the receptor through an infusion component. Wherein, the proximal end of the infusion assembly includes a through needle and a tube connected to the needle. The infusion set connector 900 includes a through connecting cavity, and the connecting cavity is used to accommodate the tube and the needle. The liquid medicine output end 110A of the liquid storage unit 100 is sealed by a sealing member (for example, a silicone plug) to prevent the insulin liquid from flowing out. When in use, the infusion assembly passes through the connecting cavity and pierces the seal of the liquid medicine output end 110A of the liquid storage unit 100, and the liquid medicine can flow through the needle to the tube and enter the receptor. At this time, the infusion set connector 900 is matched with the box body 600 to realize the fixation of the liquid storage unit 100 relative to the box body 600.

Continuing to refer to FIG. 5, when the liquid storage unit 100 is installed in the receiving hole, the drive shaft 210 of the transmission unit 200 can be inserted into the push rod 120 of the liquid storage unit 100 . And, the axis of the liquid storage unit 100 may coincide with the axis of the containing hole.

As shown in FIG. 5, the input unit 500 is arranged on the surface of the box 600 to facilitate the input of infusion information. Further, a display unit 700 is further provided on the surface of the box body 600 to use the display unit 700 to display the infusion information of the infusion device. For example, the display unit 700 can display information such as the concentration of the liquid medicine and the infusion dose entered from the input unit 500, as well as the infusion time and each input dose. Here, the display unit 700 is not particularly limited, and may be a liquid crystal display screen, an LED dot matrix screen, or the like.

In an alternative embodiment, the input unit 500 and/or the display unit 700 are not provided on the box 600, but as an independent component. At this time, the input unit 500 and/or the display unit 700 and the control unit 300 are connected by wireless communication. This embodiment has no particular limitation on the specific communication mode, and any one of infrared (IR), Bluetooth (Bluetooth), NFC, Zigbee, Wifi, cellular communication, etc. can be used.

Specifically, in an alternative embodiment, the infusion device further includes a first wireless communication unit, and an input component separated from the housing 600. Further, the first wireless communication unit is placed in the box 600 and is in communication connection with the control unit 300. The input component includes an input unit and a second wireless communication unit, the input unit is used to input infusion information, and is connected to the second wireless communication unit wirelessly, and the first wireless communication unit communicates with the second wireless communication unit. Unit wireless communication connection; further, when the input unit is used to input infusion information, the infusion information can be transmitted to the first wireless communication unit through the second wireless communication unit, and further transmitted to the first wireless communication unit via the first wireless communication unit The control unit 300. And, the control unit 300 generates a theoretical number of rotations corresponding to the motor according to the infusion information and the transmission ratio of the transmission unit.

In order to further explain the infusion device in this embodiment, and to embody the advantages of the infusion device in this embodiment, the working process of the infusion device in this embodiment in infusing insulin liquid will be described below with reference to FIGS. 1 and 2. Explain.

First, after installing the liquid storage unit 100 storing the insulin medicinal solution, the input unit 500 is used to enter infusion information and instruct to start the infusion.

Then, the control unit 300 generates a theoretical number of rotations corresponding to the motor according to the infusion information and the transmission ratio of the transmission unit 200, and controls the motor to turn on at the time of infusion.

Then, the motor drives the transmission unit 200, so that the drive shaft 210 of the transmission unit 200 drives the push rod 120 in the liquid storage unit 100 to rotate in a circumferential direction, and the encoder 400 obtains the actual rotation number of the motor and feeds it back To the control unit 300; and, the push rod 120 also moves axially relative to the liquid storage housing while being driven to rotate in the circumferential direction, so as to push the piston 140 toward the liquid medicine output end 110A, and then Discharge the insulin liquid in the liquid storage housing 110 from the liquid medicine output port 110A;

Then, the control unit 300 compares the theoretical number of rotations with the actual number of motor rotations obtained from the encoder 400, and when the conditions are met, the control unit 300 controls the motor to turn off until the next infusion time.

After the infusion of all the liquid medicines is completed, the liquid storage unit 100 can be directly removed from the box 600, and then the transmission unit 200 can be reset (in this embodiment, the drive shaft 210 of the transmission unit 200 is specifically Circumferential reset), and replace the new liquid storage unit containing insulin liquid.

It should be noted that, during the above-mentioned infusion process, when the push rod 120 moves in a spiral axial direction, the drive shaft 210 only rotates in the circumferential direction and does not move axially. Therefore, when reinstalling the liquid storage unit that stores the insulin liquid, it is not necessary to axially reset the drive shaft 210, just return the drive shaft to the initial position in the circumferential direction, and then set the liquid storage unit When installed in the box 600, the drive shaft 210 can be aligned and inserted into the push rod 120 of the liquid storage unit.

For example, the driving shaft 210 rotates 310.3 revolutions from the start of use of the liquid storage unit 100 until the liquid storage unit 100 has discharged all the insulin liquid. The output end push rod of the transmission unit of the traditional insulin infusion device needs to rotate 310.3 turns in the reverse direction to realize the circumferential and axial reset. With the infusion device of this embodiment, the drive shaft 210 only needs to rotate 0.3 turns in the reverse direction. Achieve reset. In this way, the wear of the transmission unit 200 can be effectively reduced, the reset time can be saved, and the power consumption can be reduced.

In summary, in the infusion device provided by this embodiment, the liquid storage unit includes a liquid storage housing, a piston, and a push rod. The push rod abuts against the piston and is positioned relative to the liquid storage housing. While rotating, the push rod also moves axially relative to the liquid storage housing to drive the piston to move; the transmission unit and the push rod are movably connected in the axial direction of the push rod, and Driven by the driving unit, the push rod is driven to rotate in a circumferential direction. Compared with the existing insulin infusion device, the piston and push rod can be replaced together with the liquid storage unit after the infusion device provided by this embodiment is used to infuse all insulin liquids, avoiding long-term use of components such as the piston There is a problem of poor infusion accuracy due to wear. Therefore, by using the infusion device of this embodiment for infusion, the infusion dose adjustment accuracy is high, the infusion dose is more uniform, and the risk of the patient's blood sugar instability is reduced.

In addition, in the infusion device of this embodiment, after all the insulin liquid in the current storage unit is infused, the reset operation is simple when the transmission unit is reset, and the drive shaft only needs to rotate less than one revolution to achieve reset . In this way, it is beneficial to reduce the loss of the transmission unit and the motor, and increase the use time of the energy provider.

In the foregoing embodiment, the liquid medicine stored in the liquid storage unit 100 in the infusion device is an insulin liquid medicine, which is only an exemplary illustration, and does not constitute a limitation of the present invention. Those skilled in the art should understand that the liquid medicine stored in the liquid storage unit 100 in the infusion device is not limited to insulin liquid medicine, but may also be other liquid medicines, for example, for the treatment of hypogonadotropic hypogonadism. Pregnant gonadorelin (gonadorelin) and so on.

The foregoing description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes or modifications made by persons of ordinary skill in the field of the present invention based on the foregoing disclosure shall fall within the protection scope of the claims.

Claims

An infusion device, characterized in that it comprises:

Drive unit;

A liquid storage unit, the liquid storage unit includes a liquid storage housing, a piston and a push rod, the liquid storage housing includes a through inner cavity and an open end and a liquid medicine output end respectively located at both ends of the inner cavity. A movable seal of the piston is accommodated in the inner cavity, the push rod abuts against the piston, and the push rod can rotate relative to the liquid storage housing while still relative to the The liquid storage housing moves axially to drive the piston to move to the liquid medicine output end; and,

A transmission unit, which is movably connected to the push rod in an axial direction, and can drive the push rod to rotate in a circumferential direction under the drive of the drive unit.
The infusion device according to claim 1, wherein the push rod is threadedly connected with the liquid storage housing at the open end of the liquid storage housing, so that when the push rod can rotate in the circumferential direction, It also moves axially along the liquid storage housing.
The infusion device according to claim 2, wherein the push rod has an inner hole extending in an axial direction, the transmission unit includes a drive shaft, and the distal end of the drive shaft is inserted into the push rod In the inner hole, and circumferentially fixed with the push rod.
The infusion device of claim 3, wherein the drive shaft is a prismatic structure, and the inner hole of the push rod is a polygonal cylindrical structure that matches the prismatic structure; or, the A protrusion is provided on the outer wall of the drive shaft, and the push rod further has a groove communicating with the inner hole, and the protrusion of the drive shaft and the groove of the push rod are engaged with each other.
The infusion device of claim 3, wherein the axis of the drive shaft and the axis of the push rod coincide.
The infusion device according to claim 2, wherein the liquid storage housing further comprises a connecting sleeve provided at the open end, the connecting sleeve comprising a first sleeve and a second sleeve connected to the first sleeve Two sleeves, the first sleeve is fixedly connected with the open end of the liquid storage housing, and the second sleeve is screwed with the push rod.
The infusion device according to claim 6, wherein the first sleeve and the opening end are threaded, snapped, glued or melted.
The infusion device of claim 2, wherein the inner wall of the open end is provided with an internal thread, and the outer wall of the push rod is provided with an external thread that matches the internal thread on the open end to The threaded connection between the push rod and the open end is realized.
The infusion device of claim 3, wherein the transmission unit further includes a gear set, the gear set includes a first gear and a second gear, the first gear and the output of the drive unit Shaft connection, the central shaft of the second gear is coaxially connected with the drive shaft, and the first gear drives the second gear to rotate.
The infusion device of claim 9, wherein the gear set further comprises a third gear, a fourth gear and a fifth gear, the first gear is externally meshed with the third gear, and the first gear Three gears are externally meshed with the fourth gear, and the fourth gear and the fifth gear are coaxially arranged, and the fifth gear is externally meshed with the second gear.
The infusion device according to claim 9, wherein the gear ratio of the gear set is (3:1) to (7:1).
The infusion device according to claim 1, wherein the infusion device further comprises a control unit, the driving unit comprises a motor, and the control unit is configured to generate a theoretical number of rotations corresponding to the motor, To control the rotation of the motor.
The infusion device of claim 12, wherein the infusion device further comprises an encoder, which is arranged on the motor and is used to obtain the actual number of rotations of the motor, and The encoder is also communicatively connected with the control unit to feed back the actual number of rotations of the motor to the control unit.
The infusion device according to claim 12, wherein the infusion device further comprises an input unit for inputting infusion information, the input unit is communicatively connected with the control unit, and the The control unit generates a theoretical number of rotations corresponding to the motor according to the infusion information and the transmission ratio of the transmission unit.
The infusion device of claim 12, wherein the infusion device further comprises a box, the drive unit and the transmission unit are fixedly installed in the box, and the liquid storage unit is detachable Installed in the box.
The infusion device according to claim 15, wherein the box body is provided with an accommodating hole, the accommodating hole is configured to accommodate the liquid storage unit and restrict the circumferential rotation of the liquid storage unit.
The infusion device according to claim 16, characterized in that, the infusion device further comprises an infusion set connector, and the infusion set connector is detachably connected with the box body at the opening of the receiving hole, In addition, the infusion set connector also abuts against the liquid storage unit contained in the containing hole to restrict the axial movement of the liquid storage unit.
The infusion device according to claim 15, wherein the infusion device further comprises a first wireless communication unit and an input component separated from the housing; wherein,

The first wireless communication unit is arranged in the box body and is in communication connection with the control unit;

The input component includes an input unit and a second wireless communication unit. The input unit is used to input infusion information and is in communication connection with the second wireless communication unit. The first wireless communication unit is connected to the second wireless communication unit. Communication unit wireless communication connection;

And, the control unit generates a theoretical number of rotations corresponding to the motor according to the infusion information and the transmission ratio of the transmission unit.
A liquid storage unit for infusion equipment, characterized in that the liquid storage unit includes a liquid storage housing, a piston and a push rod, and the liquid storage housing includes a through inner cavity and is respectively located in the inner cavity The open ends at both ends and the liquid medicine output end, the piston is movably sealed and contained in the inner cavity, the push rod abuts against the piston, and the push rod can be positioned relative to the liquid storage shell While the body rotates circumferentially, it also moves axially relative to the liquid storage housing to drive the piston to move to the liquid medicine output end.
A control unit, characterized in that it is used to control the liquid storage unit according to claim 19 to realize the circumferential rotation of the push rod in the liquid storage unit, and the control unit comprises:

Drive unit; and,

A transmission unit, which is movably connected to the push rod in an axial direction, and can drive the push rod to rotate in a circumferential direction under the drive of the drive unit.