Electromagnetically-driven precision fluid delivery device and patch product using same

Abstract

An electromagnetically-driven precision fluid delivery device and a patch product using same. The device comprises a liquid reservoir (1), a liquid pushing mechanism (2), a rotating wheel (3) and an electromagnetic actuation mechanism, wherein the liquid pushing mechanism (2) comprises a piston (21) and a push rod (22), the piston (21) being slidably fitted into the liquid reservoir (1); the rotating wheel (3) is threadedly connected to the push rod (22) and, when rotating in a first direction, pushes the liquid pushing mechanism (2) to move in a liquid pushing direction; and the electromagnetic actuation mechanism comprises an electromagnet (61), an engaging block (62) and a reset element (63); when the electromagnet (61) is energized, the electromagnet (61) exerts an attractive or repulsive force on the engaging block (62), causing the engaging block (62) to move in a corresponding direction; when the electromagnet (61) is de-energized, the reset element (63) resets the engaging block (62); and the engaging block (62) is configured, during the movement in the corresponding direction or resetting, to drive the rotating wheel (3) to rotate in the first direction.

Description

Fluid precision delivery device based on electromagnetic drive and application thereof to dressing product TECHNICAL FIELD

[0001] The present application relates to the field of fluid delivery, in particular to a fluid precision delivery device based on electromagnetic drive and application thereof to dressing product. BACKGROUND

[0002] In clinical practice, it is often necessary to deliver therapeutic fluid into the body of a patient in a timed and quantified manner. For example, for diabetes, it is necessary to inject insulin into the body of a part of diabetic patients in a timed and quantified manner. In order to improve the convenience of delivery and the accuracy of single delivery, more and more fluid delivery devices have been developed.

[0003] The fluid delivery device mainly pushes the fluid in the liquid reservoir out through a linear movement driving mechanism driving a plunger. The linear movement driving mechanism generally comprises a power mechanism and a screw nut structure cooperating with each other. The power mechanism drives the screw to rotate, which is converted into the linear movement of the nut. The nut pushes the plunger to move through its linear movement. The power mechanism is usually an electric motor. Such power mechanism has the following problems.

[0004] The motor rotates relatively fast, and a set of speed reduction gear system is needed to reduce the speed, resulting in a relatively large size, which is contrary to the development trend of lightness, thinness and miniaturization.

[0005] Due to the limitation of the minimum angle of rotation of the motor, the rotation angle cannot be very small, and the rotation angle resolution is low, resulting in low delivery accuracy of the liquid.

[0006] The motor has a large operating noise, which affects the use experience of the patient.

[0007] The motor has a high cost. When the fluid delivery device is a disposable consumable, the use of the motor has a low cost performance. In addition, the motor structure is complex and has poor use reliability.

[0008] Therefore, it is necessary to provide a fluid delivery device with better performance. SUMMARY

[0009] The technical problem to be solved by the present application is to overcome the defects of the prior art and provide a fluid precision delivery device based on electromagnetic drive, which has high delivery accuracy, simple structure, low energy consumption, can realize lightness, thinness and miniaturization, and has simple structure, low cost and is more suitable for use as a disposable and dressing liquid pushing device.

[0010] In order to solve the above technical problems, the technical scheme of the present application is as follows: a fluid precision delivery device based on electromagnetic drive, comprising:

[0011] a liquid reservoir;

[0012] The liquid pushing mechanism comprises a piston and a push rod connected with each other, the piston is fitted in the liquid reservoir and is not allowed to rotate relative to the liquid reservoir;

[0013] A rotating wheel with a threaded rod screwed with the push rod, when the rotating wheel rotates towards the first direction, the rotating wheel pushes the liquid pushing mechanism to move in the liquid pushing direction through the cooperation of the threaded rod and the push rod;

[0014] An electromagnetic actuating mechanism comprising an electromagnet, a cooperating block and a reset element, when the electromagnet is powered, the electromagnet applies an attractive force or a repulsive force to the cooperating block to make the cooperating block move towards a corresponding direction, when the electromagnet is powered off, the reset element resets the cooperating block, and the cooperating block is used to drive the rotating wheel to rotate towards the first direction during the movement or reset of the cooperating block.

[0015] Further, the reset element is an elastic element, when the electromagnet is powered, the electromagnet applies an attractive force or a repulsive force to the cooperating block to make the cooperating block move towards a direction to deform the elastic element, when the electromagnet is powered off, the elastic element rebounds to make the cooperating block move towards a reset direction of the elastic element.

[0016] Further, the reset element is a reset electromagnet, when the electromagnet is powered off, the reset electromagnet is powered on to apply an attractive force or a repulsive force to the cooperating block to reset the cooperating block.

[0017] Further, the rotating wheel is a first ratchet wheel, a stop pawl cooperates with the first ratchet wheel to prevent the first ratchet wheel from rotating in a second direction opposite to the first direction, and does not interfere with the rotation of the first ratchet wheel towards the first direction.

[0018] Further, the electromagnetic driving-based fluid precision delivery device further comprises a linkage mechanism, the cooperating block is linked with the first ratchet wheel through the linkage mechanism.

[0019] Further, a specific structure of the first linkage mechanism is provided, the linkage mechanism comprises:

[0020] A second ratchet wheel coaxial with the first ratchet wheel and capable of rotating relative to the first ratchet wheel, the inclination direction of the ratchet teeth of the second ratchet wheel is opposite to the inclination direction of the ratchet teeth of the first ratchet wheel;

[0021] A cooperating pawl installed on the first ratchet wheel, cooperating with the second ratchet wheel, and not interfering with the rotation of the second ratchet wheel towards the second direction independently of the first ratchet wheel, the second ratchet wheel pushes the first ratchet wheel to rotate towards the first direction through the cooperating pawl during the rotation towards the first direction;

[0022] A rotating rod is fixedly connected with the second ratchet wheel and coaxial with the second ratchet wheel, and the matching block is connected with the rotating rod through the connecting rod.

[0023] Further, a specific structure of a second linkage structure is provided, the linkage structure comprising a hook portion connected to the matching block, when the electromagnet applies an attractive force or a repulsive force to the matching block, the hook portion actuates the ratchet teeth of the first ratchet wheel to rotate the first ratchet wheel in a first direction.

[0024] Further, the rotating wheel is a light wheel structure, and the electromagnet and the elastic element each have two, the two electromagnets being a first electromagnet and a second electromagnet, and the two elastic elements being a first elastic element and a second elastic element; wherein,

[0025] The first elastic element is connected between the first electromagnet and the matching block, when the first electromagnet is energized, the matching block is applied with an attractive force to compress the first elastic element to separate from the rotating wheel or is applied with a repulsive force to stretch the first elastic element and contact the rotating wheel, and when the first electromagnet is de-energized, the matching block is reset under the action of the first elastic element;

[0026] The second elastic element is connected to the first electromagnet, when both the second electromagnet and the first electromagnet are energized, the second electromagnet applies an attractive force or a repulsive force to the first electromagnet to move the first electromagnet in a direction parallel to the tangent direction of the rotating wheel and deform the second elastic element, and when at least one of the first electromagnet and the second electromagnet is de-energized, the second electromagnet is reset under the action of the second elastic element.

[0027] Further, in order to detect whether the rotating wheel rotates normally and the rotating angle, the fluid precision delivery device driven by electromagnetism further comprises a rotating wheel sensor for detecting the rotating angle of the rotating wheel.

[0028] Further, in order to detect whether the piston moves normally and the moving amount, the fluid precision delivery device driven by electromagnetism further comprises a piston displacement sensor for detecting the displacement amount of the piston.

[0029] Further, in order to improve the integration, the fluid precision delivery device driven by electromagnetism further comprises a carrier provided with a liquid reservoir groove, a push rod groove and a rotating wheel groove, and at least a part of the liquid reservoir, at least a part of the push rod and at least a part of the first ratchet wheel are respectively constrained in the liquid reservoir groove, the push rod groove and the rotating wheel groove.

[0030] The application also relates to a dressing product comprising the fluid precision delivery device driven by electromagnetism.

[0031] Further, the patch product is an insulin patch or a pain-relieving patch or an anesthetic patch.

[0032] After the technical scheme is applied, the application has the following beneficial effects:

[0033] The application adopts electromagnetic driving as the power of the liquid pushing mechanism, converts the movement of the matching block towards the corresponding direction into the movement of the rotating wheel rotating towards the first direction, has small operation noise compared with common motors, simplifies the structure, and also saves the reduction system, so that the whole fluid delivery device and even the patch product, such as an insulin patch, a pain-relieving patch, an anesthetic patch, etc., using the fluid delivery device can be light and thin, miniaturized, improve the patient's comfort, and reduce the use cost;

[0034] The electromagnetic actuating mechanism in the application is also relatively energy-saving in use, a small-capacity power supply, such as a small-capacity and small-size battery, can meet the use requirements, so that the whole fluid delivery device and even the patch product using the fluid delivery device can be lighter and thinner, more miniaturized, and have simple structure and low cost, and is suitable for being used as a patch type and disposable product;

[0035] The electromagnet can make the rotating wheel rotate only a very small angle in each energization period, and correspondingly, the amount of liquid pushed by the liquid pushing mechanism is also very small, that is, the fluid delivery resolution can be very high, and the requirement of high-precision drug delivery in medicine can be met. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is a structural schematic diagram of the fluid precision delivery device based on electromagnetic driving of the application;

[0037] Fig. 2 is a structural schematic diagram of the cooperation of the liquid reservoir, the liquid pushing mechanism and the rotating member group of the application;

[0038] Fig. 3 is an exploded view of the liquid pushing mechanism and the threaded rod of the application;

[0039] Fig. 4 is a structural schematic diagram of the cooperation of the first electromagnetic actuating mechanism and the first ratchet wheel when the reset element is an elastic element in the application;

[0040] Fig. 5 is an action state diagram of the structure in Fig. 4 in one period;

[0041] Fig. 6 is a structural schematic diagram of the cooperation of the first electromagnetic actuating mechanism and the first ratchet wheel when the reset element is a reset electromagnet in the application;

[0042] Fig. 7 is an action state diagram of the structure in Fig. 6 in one period;

[0043] Fig. 8 is a structural schematic diagram of the cooperation of the second electromagnetic actuating mechanism and the first ratchet wheel when the reset element is an elastic element in the application;

[0044] Fig. 9 is a motion state diagram of the structure in Fig. 8 in one cycle;

[0045] Fig. 10 is a structure diagram of a second electromagnetic actuating mechanism cooperating with the first ratchet wheel in the case that the reset element is a reset electromagnet;

[0046] Fig. 11 is a motion state diagram of the structure in Fig. 10 in one cycle;

[0047] Fig. 12 is a structure diagram of a third electromagnetic actuating mechanism cooperating with the light wheel structure;

[0048] Fig. 13 is a motion state diagram of the structure in Fig. 12 in one cycle;

[0049] Fig. 14 is a structure diagram of a fourth electromagnetic actuating mechanism cooperating with the light wheel structure;

[0050] Fig. 15 is a motion state diagram of the structure in Fig. 14 in one cycle;

[0051] Fig. 16 is a structure diagram of a carrier of the present application;

[0052] In the figures, 1 is a liquid reservoir; 11 is a detection port; 2 is a liquid pushing mechanism; 21 is a piston; 22 is a pushing rod; 221 is an external thread; 3 is a rotating wheel; 3a is a first ratchet wheel; 3b is a light wheel structure; 31 is a threaded rod; 311 is an internal thread; 32 is a pair of shot holes; 4 is a retreat-stopping pawl; 5 is a linkage structure; 51a is a second ratchet wheel; 52a is a cooperating pawl; 53a is a rotating rod; 54a is a connecting rod; 51b is a hook portion; 61 is an electromagnet; 611 is a first electromagnet; 612 is a second electromagnet; 62 is a cooperating block; 63 is a reset element; 631 is a first elastic element; 632 is a second elastic element; 64 is a fixing block; 65 is a limiting block; 7 is a rotating wheel sensor; 71 is a transmitting end; 72 is a receiving end; 8 is a piston displacement sensor; 9 is a carrier; 91 is a liquid reservoir groove; 92 is a pushing rod groove; 93 is a rotating wheel groove; 94 is a rotating rod groove. DETAILED DESCRIPTION

[0053] In order to make the content of the present application more easily understood, the present application is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings.

[0054] Embodiment One

[0055] As shown in Figs. 1 to 16, a fluid precision delivery device based on electromagnetic driving comprises:

[0056] a liquid reservoir 1;

[0057] a liquid pushing mechanism 2 comprising a piston 21 and a pushing rod 22 connected to each other, the piston 21 being slidingly fitted in the liquid reservoir 1 and being not allowed to rotate relative to the liquid reservoir 1;

[0058] The rotating wheel 3 has a threaded rod 31 screwed with the push rod 22, and when the rotating wheel 3 rotates towards the first direction, the push liquid mechanism 2 is pushed to move along the liquid pushing direction by the cooperation of the threaded rod 31 and the push rod 22.

[0059] The electromagnetic actuating mechanism includes an electromagnet 61, a cooperation block 62 and a reset element 63, when the electromagnet 61 is powered, the electromagnet 61 applies an attractive force or a repulsive force to the cooperation block 62 to make the cooperation block 62 move towards the corresponding direction, and when the electromagnet 61 is powered off, the reset element 63 resets the cooperation block 62, and the cooperation block 62 is used to drive the rotating wheel 3 to rotate towards the first direction during the movement or the reset of the cooperation block 62.

[0060] The embodiment adopts electromagnetic driving as the power for the movement of the push liquid mechanism 2, and converts the movement of the cooperation block 62 towards the corresponding direction into the movement of the rotating wheel 3 rotating towards the first direction, compared with the ordinary motor, the operation noise is small, the structure is simplified, and the reduction system is also omitted, and the whole fluid delivery device and even the application of the fluid delivery device such as the insulin patch, the pain relief patch and the anesthetic patch can be lighter and thinner, more miniature, improve the patient's use comfort, and reduce the use cost, and is suitable for use as a disposable medical product; and the electromagnetic actuating mechanism in the embodiment is also more energy-saving in use, and a small capacity power supply such as a small capacity and small size battery can meet the use requirements, so as to make the whole fluid delivery device and even the application of the fluid delivery device such as the patch further lighter and thinner, more miniature. In addition, the embodiment realizes the feeding rotation of the rotating wheel 3 by intermittently supplying power to the electromagnet 61, and in each cycle, the rotating wheel 3 can only rotate a very small angle, and correspondingly, the amount of movement of the push liquid mechanism 2 is also very small, and the fluid delivery resolution can be very high, and can meet the demand of high-precision medical administration.

[0061] It should be noted that if the cooperation block 62 moves under the action of the attractive force applied by the electromagnet 61, the cooperation block 62 can be a magnet, or a non-magnet block made of magnetic material, and if the cooperation block 62 moves under the action of the repulsive force applied by the electromagnet 61, the cooperation block 62 is a magnet.

[0062] In the embodiment, as shown in FIG. 1 and FIG. 16, the fluid precision delivery device based on electromagnetic drive further comprises a carrier 9, which is provided with a reservoir groove 91, a push rod groove 92 and a rotating wheel groove 93, at least a part of the reservoir 1, at least a part of the push rod 22 and at least a part of the rotating wheel 3 are respectively constrained in the reservoir groove 91, the push rod groove 92 and the rotating wheel groove 93. The grooves of the carrier 9 play a role of constraint and fixation for the components, and integrate the whole fluid precision delivery device based on electromagnetic drive as a whole. The carrier 9 is further provided with a threaded rod groove, which is connected with the push rod groove 92, and a gland is further provided on the carrier 9 to constrain the threaded rod or the push rod 22 in the corresponding groove, so as to prevent the components from being separated from the grooves on the carrier 9.

[0063] In the embodiment, the structure for preventing the liquid pushing mechanism 2 from rotating relative to the reservoir 1 can be various. In the example shown in FIG. 1, FIG. 2 and FIG. 3, the cross section of the reservoir 1 perpendicular to the liquid pushing direction is set as an ellipse, and the cross section of the piston 21 perpendicular to the liquid pushing direction is also set as an ellipse, so as to prevent the liquid pushing mechanism 2 from rotating relative to the reservoir 1. Of course, the cross section of the reservoir 1 and the piston 21 perpendicular to the liquid pushing direction can also be other non-circular structures such as square, triangle, pentagon, hexagon, etc. The liquid pushing mechanism 2 can also be prevented from rotating relative to the reservoir 1 by the cooperation of keys and key grooves, etc.

[0064] In the embodiment, as shown in FIG. 2 and FIG. 3, one of the push rod 22 and the threaded rod 31 is provided with external threads, and the other is provided with internal threads, so as to realize threaded connection. In the example shown in FIG. 1, FIG. 2 and FIG. 3, the push rod 22 is provided with external threads 221, and the threaded rod 31 is a hollow structure and is provided with internal threads 311. The threaded connection between the external threads 221 and the internal threads 311 converts the rotation of the rotating wheel 3 into the linear movement of the push rod 22 along the axial direction.

[0065] In the embodiment, the reset element 63 can be an elastic element or a reset electromagnet. In the case that the reset element 63 is an elastic element, when the electromagnet 61 is powered, the electromagnet 61 applies an attractive force or a repulsive force to the cooperating block 62 to make the cooperating block 62 move towards the direction of deforming the elastic element, and when the electromagnet 61 is powered off, the elastic element rebounds to make the cooperating block 62 move towards the reset direction of the elastic element. In the case that the reset element 63 is a reset electromagnet, when the electromagnet 61 is powered off, the reset electromagnet is powered to apply an attractive force or a repulsive force to the cooperating block 62 to reset the cooperating block 62.

[0066] In the embodiment, as shown in FIG. 1, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10 and FIG. 11, the rotating wheel 3 is a first ratchet wheel 3a, a stop pawl 4 is matched with the first ratchet wheel 3a, used to prevent the first ratchet wheel 3a from rotating in a second direction opposite to the first direction, and does not interfere with the rotation of the first ratchet wheel 3a towards the first direction. The matching block 62 is linked with the first ratchet wheel 3a through the linkage structure 5.

[0067] In the embodiment, one of the first direction and the second direction is clockwise direction, and the other is counterclockwise direction. The ratchet teeth of the first ratchet wheel 3a are inclined towards the second direction from the root to the head, the stop pawl 4 is arranged on the carrier 9, has a certain elasticity, and abuts against the inner side of the ratchet teeth of the first ratchet wheel 3a. In the process of the rotation of the first ratchet wheel 3a towards the first direction, the stop pawl 4 can pass the outer side of the ratchet teeth of the first ratchet wheel 3a and enter the ratchet tooth slot, and abut against the inner side of the ratchet teeth, so that the stop pawl 4 does not interfere with the rotation of the first ratchet wheel 3a towards the first direction. When the first ratchet wheel 3a rotates towards the second direction, because the stop pawl 4 abuts against the ratchet tooth slot, the stop pawl 4 can prevent the first ratchet wheel 3a from rotating towards the second direction.

[0068] In the embodiment, the stop pawl 4 can have various structures, as shown in FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10 and FIG. 11. The stop pawl 4 includes a spring piece and a stop paw, one end of the spring piece is fixed on the carrier 9, one end of the stop paw is hinged on the carrier 9 through a hinge shaft, and the other end abuts against the other end of the spring piece. Of course, the stop paw can also be directly fixed on the other end of the spring piece through bonding or welding, and the spring piece and the stop paw can be integrally formed.

[0069] In the embodiment, the linkage structure 5 can have various structures, as long as it can convert the movement of the electromagnet 61 or the reset element 63 to the movement of the matching block 62 into the rotation of the first ratchet wheel 3a towards the first direction. Two structures of the linkage structure 5 are listed.

[0070] The first structure is shown in FIG. 1, FIG. 4, FIG. 5, FIG. 6 and FIG. 7. The linkage structure 5 includes:

[0071] A second ratchet wheel 51a is coaxial with the first ratchet wheel 3a and can rotate relative to the first ratchet wheel 3a. The inclination direction of the ratchet teeth of the second ratchet wheel 51a is opposite to the inclination direction of the ratchet teeth of the first ratchet wheel 3a;

[0072] A matching pawl 52a is installed on the first ratchet wheel 3a, matched with the second ratchet wheel 51a, and does not interfere with the rotation of the second ratchet wheel 51a towards the second direction independently of the first ratchet wheel 3a. In the process of the rotation of the second ratchet wheel 51a towards the first direction, the second ratchet wheel 51a pushes the first ratchet wheel 3a to rotate towards the first direction through the matching pawl 52a;

[0073] The rotating rod 53a is coaxial with the second ratchet 51a and fixedly connected with the second ratchet 51a. The connecting rod 54a connects the rotating rod 53a with the matching block 62. The carrier 9 is further provided with a rotating rod slot 94, and at least a part of the rotating rod 53a is constrained in the rotating rod slot 94.

[0074] Generally, the number of the ratchets of the first ratchet 3a and the second ratchet 51a is consistent. The number of the ratchets of the first ratchet 3a and the second ratchet 51a is large, and the number of the ratchets shown in FIG. 1, FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7 is small, which is only for the purpose of showing the structure and does not represent the actual number of the ratchets.

[0075] In this structure, the first ratchet 3a and the second ratchet 51a can be rotatably matched through the rotating bearing, or a simplified structure can be used to realize the rotating matching, that is, a pin shaft is inserted into the center holes of the first ratchet 3a and the second ratchet 51a at the same time. In order to realize the compact structure, a slot for accommodating the second ratchet 51a can be arranged on the end surface of the first ratchet 3a, the first ratchet 3a serves as the outer ratchet, and the second ratchet 51a serves as the inner ratchet.

[0076] In this structure, the ratchets of the second ratchet 51a are inclined towards the first direction from the root to the head, and the direction of the ratchets of the first ratchet 3a is just opposite to that of the ratchets of the second ratchet 51a. The matching pawl 52a and the stop pawl 4 can adopt the same structure, except that the stop pawl is installed on the carrier 9 and the matching pawl 52a is installed on the first ratchet 3a, which will not be described in detail. In the process of rotating the second ratchet 51a towards the first direction, the second ratchet 51a pushes the first ratchet 3a to rotate towards the first direction through the matching pawl 52a; in the process of rotating the second ratchet 51a towards the second direction, the matching pawl 52a can pass the outer side of the ratchets of the second ratchet 51a into the ratchet slot, and the matching pawl 52a will not push the first ratchet 3a to rotate in this process, and the first ratchet 3a remains in the original position. That is, the second ratchet 51a can push the first ratchet 3a to rotate towards the first direction synchronously, or can rotate towards the second direction independently.

[0077] It should be noted that in the structure shown in FIG. 1, FIG. 4 and FIG. 5, the reset element 63 is an elastic element, and in the structure shown in FIG. 6 and FIG. 7, the reset element 63 is a reset electromagnet. The structures in FIG. 4 and FIG. 6 are similar in action state in one cycle.

[0078] As shown in FIG. 4 and FIG. 5, in the case that the reset element 63 is an elastic element, one end of the elastic element is connected with the fixed block 64, and the other end is connected with the matching block 62.

[0079] Based on the structure of Fig. 4, the electromagnet 61 is intermittently powered, i.e. powered-off-powered-off…, in a cycle, and the specific process is shown in Fig. 5:

[0080] In the first stage, the electromagnet 61 is powered, the electromagnet 61 applies repulsive force to the cooperating block 62, the cooperating block 62 moves towards the fixed block 64, compresses the elastic element, and at the same time drives the rotating rod 53a to rotate towards the first direction through the connecting rod 54a, the rotating rod 53a drives the second ratchet wheel 51a, and the second ratchet wheel 51a drives the first ratchet wheel 3a to rotate towards the first direction through the cooperating pawl 52a, and the liquid pushing mechanism moves a certain distance along the liquid pushing direction;

[0081] In the second stage, the electromagnet 61 is powered off, the repulsive force applied by the electromagnet 61 to the cooperating block 62 disappears, and the cooperating block 62 is reset under the rebound of the elastic element, and in the process of resetting, the rotating rod 53a is driven to rotate towards the second direction through the connecting rod 54a, and the rotating rod 53a drives the second ratchet wheel 51a to rotate towards the second direction.

[0082] That is, in each powered cycle, the resolution of the single liquid pushing amount can be the linear displacement amount of the liquid pushing mechanism 2 converted by the rotation of one ratchet tooth of the first ratchet wheel 3a, and the resolution can be very high.

[0083] In addition, as shown in Figs. 1, 2, 4 and 5, the rotating rod 53a is coaxial with the rotation center line of the second ratchet wheel 51a, and the diameter of the rotating rod 53a is much smaller than the diameter of the second ratchet wheel 51a, the cooperating block 62 is connected to the rotating rod 53a through the connecting rod 54a, and in the case of ensuring that the cooperating block 62 has a relatively large rotating radius, the cooperating block 62 can not exceed the outer periphery of the second ratchet wheel 51a, further ensuring the light and thin structure and miniaturization.

[0084] The second kind, as shown in Figs. 8, 9, 10 and 11, the linkage structure 5 includes a hook portion 51b connected to the cooperating block 62 and having elasticity, and when the electromagnet 61 applies attractive force or repulsive force to the cooperating block 62, the hook portion 51b pushes the inner side of the ratchet tooth of the first ratchet wheel 3a to make the first ratchet wheel 3a rotate towards the first direction. In the process of the hook portion 51b pushing the inner side of the ratchet tooth of the first ratchet wheel 3a, the inner side of the hook portion 51b is opposite to the inner side of the ratchet tooth of the first ratchet wheel 3a, and the included angle between the inner side of the hook portion 51b and the cooperating block 62 is an acute angle. In order to make the cooperating block 62 reliably push the inner side of the ratchet tooth of the first ratchet wheel 3a, a sliding groove is provided on the carrier, and the cooperating block 62 is slidably fitted in the sliding groove, and the sliding groove constrains the movement track of the cooperating block 62.

[0085] It should be noted that in the structure shown in FIG. 8, FIG. 9, the reset element 63 is an elastic element, and in the structure shown in FIG. 10, FIG. 11, the reset element 63 is a reset electromagnet. The structures in FIG. 8 and FIG. 10 are similar in action within a cycle. In addition, in order to limit the movement trajectory of the fitting block 62, the fitting block is slidably fitted in a groove of the carrier 9 or a rod fixed to the carrier 9.

[0086] Based on the structure in FIG. 8, the electromagnet is intermittently powered, i.e. power on-power off-power on-power off…, within a cycle, as shown in FIG. 9, the specific process is as follows:

[0087] In the first stage, the electromagnet 61 is powered on, the fitting block 62 moves towards the electromagnet 61 under the attraction of the electromagnet 61, and the fitting block 62 is stretched in the process of moving, at the same time, the first ratchet 3a is rotated towards the first direction by the hook 51b, and the liquid pushing mechanism moves a certain distance in the liquid pushing direction;

[0088] In the second stage, the electromagnet 61 is powered off, the attraction of the electromagnet 61 to the fitting block 62 disappears, and the fitting block 62 is reset under the resilience of the elastic element, the fitting block 62 drives the hook 51b to deform elastically and then slides through the outside of the ratchet teeth of the first ratchet 3a to reset, and the first ratchet 3a remains stationary. The resolution of the single liquid pushing amount can be the linear displacement of the liquid pushing mechanism 2 converted by the rotation of one ratchet tooth of the first ratchet 3a, and the resolution can be very high.

[0089] In addition, as shown in FIG. 8, FIG. 9, the fixed block 64 and the electromagnet 61 can be fixed on the carrier 9, and the fixed block 64 and the electromagnet 61 are arranged side by side in the up-down direction, both of which do not exceed the first ratchet 3a in the up-down direction, which can further ensure the lightness and thinness of the entire device and even the entire application product. FIG. 10 and FIG. 11 are the same, the electromagnet 61 and the reset electromagnet are arranged side by side in the up-down direction, both of which do not exceed the first ratchet 3a in the up-down direction.

[0090] Embodiment Two

[0091] The difference between this embodiment and embodiment one is that, as shown in FIG. 12, FIG. 13, FIG. 14 and FIG. 15, the rotating wheel 3 is a light wheel structure 3b, the electromagnet 61 and the elastic element each have two, the two electromagnets 61 are respectively a first electromagnet 611 and a second electromagnet 612, and the two elastic elements are respectively a first elastic element 631 and a second elastic element 632; wherein,

[0092] The first elastic element 631 is connected between the first electromagnet 611 and the engaging block 62. When the first electromagnet 611 is energized, the engaging block 62 is pressed to compress the first elastic element 631 to separate from the rotating wheel 3 or is pulled to stretch the first elastic element 631 and contact the rotating wheel 3. When the first electromagnet 611 is de-energized, the engaging block 62 is reset under the action of the first elastic element 631.

[0093] The second elastic element 632 is connected to the first electromagnet 611. When both the first electromagnet 611 and the second electromagnet 612 are energized, the second electromagnet 612 applies an attractive force or a repulsive force to the first electromagnet 611 to move the first electromagnet 611 in a direction parallel to the tangent direction of the rotating wheel 3 and deform the second elastic element 632. When at least one of the first electromagnet 611 and the second electromagnet 612 is de-energized, the second electromagnet 612 is reset under the action of the second elastic element 632.

[0094] Generally, when the second elastic element 632 is fixed to the second electromagnet 612, a limiting block 65 can be arranged on the side of the first electromagnet 611 away from the second electromagnet 612 to limit the movement stroke of the first electromagnet 611, as shown in FIGS. 12 and 13. When the second elastic element 632 is fixed to a fixed block 64, the second electromagnet 612 is located on the side of the first electromagnet 611 away from the fixed block 64, as shown in FIGS. 14 and 15.

[0095] In addition, in the present embodiment, a limiting groove is arranged on the carrier 9 to limit the movement trajectory of the first electromagnet 611 to ensure smooth movement of the first electromagnet 611 in a direction parallel to the tangent direction of the rotating wheel 3. In order to enable the engaging block 62 to move synchronously with the first electromagnet 611 in a direction parallel to the tangent direction of the rotating wheel 3, the first elastic element 631 has a limiting pin at the center, which is fixed to one of the first electromagnet 611 and the engaging block 62 and is in sliding fit with the limiting hole on the other.

[0096] The electromagnetic actuating mechanism with two electromagnets 61 and two elastic elements can have multiple initial states and working processes, two of which are listed below.

[0097] The first kind is shown in FIG. 12. When neither the first electromagnet 611 nor the second electromagnet 612 is energized (initial state), the engaging block 62 contacts the rotating wheel 3. The specific working process is shown in FIG. 13, and the specific process is as follows:

[0098] In the first stage, the first electromagnet 611 is energized to apply an attractive force to the engaging block 62, the engaging block 62 is compressed to compress the first elastic element 631, and the engaging block 62 is away from the rotating wheel 3;

[0099] Second stage, the second electromagnet 612 is powered, the second electromagnet 612 applies an attractive force to the first electromagnet 611, the first electromagnet 611 moves in a direction parallel to the tangent direction of the rotating wheel 3 towards the second electromagnet 612 and compresses the second elastic element 632;

[0100] Third stage, the first electromagnet 611 and the second electromagnet 612 are both powered off, the first electromagnet 611 resets the cooperating block 62 under the resilience of the second elastic element 632, in the first half of the process of resetting the second elastic element 632, the cooperating block 62 moves towards the rotating wheel 3 under the resilience of the first elastic element 631 and contacts the rotating wheel 3, in the second half of the process of resetting the second elastic element 632, the cooperating block 62 rotates the rotating wheel 3 by a very small angle in the first direction.

[0101] Second, as shown in FIG. 14, the first electromagnet 611 and the second electromagnet 612 are both not powered (initial state), the cooperating block 62 does not contact the rotating wheel 3. The specific work is shown in FIG. 15, the specific process is as follows:

[0102] First stage, the first electromagnet 611 is powered, applies a repulsive force to the cooperating block 62, the cooperating block 62 stretches the first elastic element 631 and contacts the rotating wheel 3;

[0103] Second stage, the second electromagnet 612 is powered, the second electromagnet 612 applies an attractive force to the first electromagnet 611, the first electromagnet 611 moves the rotating wheel 3 in a direction parallel to the tangent direction of the rotating wheel 3 towards the second electromagnet 612 and stretches the second elastic element 632, in this stage, the cooperating block 62 rotates the rotating wheel 3 by a very small angle in the first direction.

[0104] Third stage, the first electromagnet 611 and the second electromagnet 612 are both powered off, the cooperating block 62 moves away from the rotating wheel 3 under the resilience of the first elastic element 631, at the same time, the first electromagnet 611 resets under the resilience of the second elastic element 632.

[0105] Embodiment three

[0106] On the basis of embodiment one or embodiment two, as shown in FIG. 1 and FIG. 15, the fluid precision conveying device based on electromagnetic drive further comprises a rotating wheel sensor 7 for detecting the rotating angle of the rotating wheel 3.

[0107] The structure of the rotating wheel sensor 7 can be various, now one is listed. As shown in FIG. 1, FIG. 12, FIG. 14 and FIG. 16, the rotating wheel sensor 7 is a reflection sensor, the emitting end 71 and the receiving end 72 of the reflection sensor are distributed on both sides of the rotating wheel 3.

[0108] In the case of the first ratchet wheel 3a, the rotation wheel sensor 7 is shielded once, which indicates that the first ratchet wheel 3a rotates one ratchet tooth. In the case of the light wheel structure 3b, as shown in FIGS. 8, 9, 10 and 11, a plurality of opposite holes 32 can be arranged at the edge of the light wheel structure 3b. The rotation wheel sensor 7 is shielded once, which indicates that the light wheel structure 3b rotates an angle between two adjacent opposite holes 32.

[0109] The rotation wheel sensor 7 can be arranged to monitor whether the rotation wheel 3 rotates normally, to determine whether the whole electromagnetic driving based fluid precision delivery device works normally, and to control the cycle number of the cycle signal of the electromagnetic actuating mechanism according to the angle feedback of the rotation wheel sensor 7.

[0110] Embodiment Four

[0111] Based on the embodiment one or the embodiment two or the embodiment three, as shown in FIG. 1 and FIG. 16, the electromagnetic driving based fluid precision delivery device further comprises a piston displacement sensor 8 for detecting the displacement of the piston 21.

[0112] The piston displacement sensor 8 can be arranged to monitor whether the piston 21 moves as expected, so as to further determine whether the whole electromagnetic driving based fluid precision delivery device works normally.

[0113] The installation position of the piston displacement sensor 8 can be various, and one is listed here. As shown in FIG. 1, the end surface of the liquid reservoir 1 facing the rotation wheel 3 is provided with a detection port 11, and the piston displacement sensor 8 is arranged outside the liquid reservoir 1 to detect the displacement of the piston 21 from the detection port 11.

[0114] Embodiment Five

[0115] A patch product comprises the electromagnetic driving based fluid precision delivery device in any one of the embodiments one to four. The patch product can be an insulin patch, a pain-relieving patch, an anesthetic patch, etc., and can be used to deliver a medicine subcutaneously or intramuscularly.

[0116] The patch product is generally a disposable consumable, and is attached to the body surface of a patient. The liquid outlet of the liquid reservoir 1 is connected to a delivery needle through a liquid injection pipeline, the delivery needle is pierced into the patient's body, and the patch product can automatically deliver a therapeutic fluid to the patient in a timed and quantitative manner. When the service life or the cumulative liquid injection amount reaches a certain value, a new patch product is used.

[0117] The patch product in the embodiment uses the electromagnetic driving based fluid precision delivery device in any one of the embodiments one to four, has high fluid delivery precision and high reliability, and can be light and thin enough and miniaturized.

[0118] The high conveying precision is embodied in that, in the traditional structure, the ordinary motor is used as the power mechanism of fluid conveying, and the resolution of the conveyed fluid is limited by the minimum angle of rotation of the motor, and the cost is high to improve the resolution, and the cost is not worth the loss; and in the application, the electromagnetic actuator mechanism can make the rotating wheel 3 rotate only a small angle in each working cycle, and correspondingly, the amount of liquid pushed by the liquid pushing mechanism 2 is also small, that is, the fluid conveying resolution can be very high, meeting the needs of high-precision medical administration.

[0119] The high reliability is embodied in that, in the traditional structure, the ordinary motor is used, and a set of speed reduction gear system is also needed, the structure is relatively complex, and the reliability is reduced; and in the application, the electromagnetic actuator mechanism is used as the power mechanism, the structure is simplified, and the reliability is naturally improved. Secondly, due to the simplified structure of the application, the cost is low, and the application can be used as a disposable consumable, and the replacement frequency can be improved, so that the reliability in use is further ensured.

[0120] The sufficient lightness, thinness and miniaturization are embodied in that, in the traditional structure, the ordinary motor is used as the power mechanism of fluid conveying, and a set of speed reduction gear system is needed to reduce the speed, resulting in a relatively large size and high energy consumption, and a large-capacity power supply needs to be equipped for driving, such as a large battery or multiple batteries, resulting in that the lightness, thinness and miniaturization cannot be realized; and in the application, the electromagnetic drive is used as the power source, the structure of the whole power mechanism is relatively simple, the whole application can be made sufficiently light and thin, and sufficiently miniaturized, and the electromagnetic actuator mechanism has low energy consumption, and a small-capacity power supply, such as a small-capacity small-size battery, can meet the use requirements, so that the application can be further made sufficiently light and thin and sufficiently miniaturized, and the patient's use comfort is improved.

[0121] Based on the above ideal embodiments according to the application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A fluid precision delivery device based on electromagnetic drive, characterized in that it comprises: a liquid storage device (1); a liquid pushing mechanism (2) comprising a piston (21) and a pushing rod (22) connected to each other, the piston (21) being slidably fitted in the liquid storage device (1) and being unable to rotate relative to the liquid storage device (1); a rotating wheel (3) having a threaded rod (31) threadedly connected to the pushing rod (22), the rotating wheel (3) being configured to push the liquid pushing mechanism (2) to move in a liquid pushing direction when the rotating wheel (3) is rotated in a first direction through cooperation of the threaded rod (31) and the pushing rod (22); an electromagnetic actuating mechanism comprising an electromagnet (61), a cooperating block (62) and a reset element (63), the electromagnet (61) being configured to apply an attractive force or a repulsive force to the cooperating block (62) to move the cooperating block (62) in a corresponding direction when the electromagnet (61) is energized, the reset element (63) being configured to reset the cooperating block (62) when the electromagnet (61) is de-energized, the cooperating block (62) being configured to drive the rotating wheel (3) to rotate in the first direction during movement or resetting of the cooperating block (62) in the corresponding direction.

2. The fluid precision delivery device based on electromagnetic drive according to claim 1, characterized in that the reset element (63) is an elastic element, the electromagnet (61) being configured to apply an attractive force or a repulsive force to the cooperating block (62) to move the cooperating block (62) in a direction in which the elastic element is deformed when the electromagnet (61) is energized, the elastic element being configured to move the cooperating block (62) in a resetting direction of the elastic element when the electromagnet (61) is de-energized.

3. The fluid precision delivery device based on electromagnetic drive according to claim 1, characterized in that the reset element (63) is a reset electromagnet, the reset electromagnet being configured to apply an attractive force or a repulsive force to the cooperating block (62) to reset the cooperating block (62) when the electromagnet (61) is de-energized.

4. The fluid precision delivery device based on electromagnetic drive according to claim 2 or 3, characterized in that the rotating wheel (3) is a first ratchet wheel (3a), a stop ratchet pawl (4) being configured to cooperate with the first ratchet wheel (3a) to prevent the first ratchet wheel (3a) from rotating in a second direction opposite to the first direction and not to interfere with rotation of the first ratchet wheel (3a) in the first direction.

5. The fluid precision delivery device based on electromagnetic drive according to claim 4, characterized in that it further comprises a linkage mechanism (5), the cooperating block (62) being linked to the first ratchet wheel (3a) through the linkage mechanism (5).

6. The fluid precision delivery device based on electromagnetic drive according to claim 5, characterized in that the linkage mechanism (5) comprises: a second ratchet wheel (51a) coaxial with the first ratchet wheel (3a) and rotatable relative to the first ratchet wheel (3a), the second ratchet wheel (51a) having ratchet teeth with an inclination direction opposite to that of the ratchet teeth of the first ratchet wheel (3a). ​ ​ ​ ​ ​ ​ A matching pawl (52a) is installed on the first ratchet wheel (3a) and cooperates with the second ratchet wheel (51a) and does not interfere with the second ratchet wheel (51a) rotating towards the second direction independently of the first ratchet wheel (3a), and the second ratchet wheel (51a) pushes the first ratchet wheel (3a) to rotate towards the first direction during the rotation towards the first direction through the matching pawl (52a); A rotating rod (53a) is fixedly connected with the second ratchet wheel (51a) and coaxial with the second ratchet wheel (51a), and the matching block (62) is connected with the rotating rod (53a) through a connecting rod (54a).

7. The electromagnetic driving-based fluid precision delivery device according to claim 5, wherein The linkage structure (5) comprises a hook portion (51b) connected to the matching block (62), and when the electromagnet (61) applies an attractive force or a repulsive force to the matching block (62), the hook portion (51b) pushes the ratchet teeth of the first ratchet wheel (3a) to make the first ratchet wheel (3a) rotate towards the first direction.

8. The electromagnetic driving-based fluid precision delivery device according to claim 2, wherein The rotating wheel (3) is a light wheel structure (3b), the electromagnet (61) and the elastic element each have two, the two electromagnets are a first electromagnet (611) and a second electromagnet (612), and the two elastic elements are a first elastic element (631) and a second elastic element (632); wherein The first elastic element (631) is connected between the first electromagnet (611) and the matching block (62), and when the first electromagnet (611) is energized, the matching block (62) is applied with an attractive force to compress the first elastic element (631) to be separated from the rotating wheel (3) or is applied with a repulsive force to stretch the first elastic element (631) and contact the rotating wheel (3), and when the first electromagnet (611) is de-energized, the matching block (62) is reset under the action of the first elastic element (631); The second elastic element (632) is connected to the first electromagnet (611), and when the second electromagnet (612) and the first electromagnet (611) are both energized, the second electromagnet (612) applies an attractive force or a repulsive force to the first electromagnet (611) to make the first electromagnet (611) move in a direction parallel to the tangent direction of the rotating wheel (3) and deform the second elastic element (632), and when at least one of the first electromagnet (611) and the second electromagnet (612) is de-energized, the second electromagnet (612) is reset under the action of the second elastic element (632).

9. The electromagnetic driving-based fluid precision delivery device according to claim 1, further comprising a rotating wheel sensor (7) for detecting the rotation angle of the rotating wheel (3). ​ and / or further comprising a piston displacement sensor (8) for detecting the displacement of the piston (21). 10.The electromagnetic driving based fluid precision delivery device according to claim 1, wherein, further comprising a carrier (9) provided with a reservoir groove (91), a push rod groove (92) and a rotating wheel groove (93), at least a part of the reservoir (1), at least a part of the push rod (22) and at least a part of the rotating wheel (3) are respectively constrained in the reservoir groove (91), the push rod groove (92) and the rotating wheel groove (93). 11.A dressing product, characterized in that, it comprises the electromagnetic driving based fluid precision delivery device according to any one of claims 1-10. 12.The dressing product according to claim 11, characterized in that, the dressing product is an insulin patch or a pain relief patch or an anesthetic patch.

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