Tube blockage monitoring device, application type medicine infusion device and monitoring method

Abstract

The invention discloses a pipe blockage monitoring device, an application type medicine infusion device and a monitoring method, and relates to the technical field of medical instruments, in particular to a pipe blockage monitoring device comprising a Hall encoder used for detecting the rotation angle of a ratchet wheel in a ratchet wheel driving assembly and comprising a code disc and a Hall element, the code disc and the ratchet wheel are coaxially and fixedly installed, and the Hall element is used for detecting the rotation angle of the ratchet wheel in the ratchet wheel driving assembly; the Hall element and the medicine storage bin are oppositely and fixedly arranged; according to the tube blockage monitoring device, the application type medicine infusion device and the monitoring method, the rotation angle of the ratchet wheel is monitored through the non-contact code disc and the Hall element in the Hall encoder, then the problems of poor contact and increase of the rotation resistance of the ratchet wheel are avoided, and meanwhile the counting module is used for counting the action times of the driving shifting piece; the difference value between the rotation angle of the ratchet wheel and the action times of the driving shifting piece is calculated, when the difference value is larger than a set value, it is indicated that the infusion device has the ratchet wheel slipping problem caused by pipe blockage, the monitoring result is accurate, limitation of the length of a medicine storage bin is avoided, and applicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to a tube blockage monitoring device, a patch-type drug infusion device and a monitoring method. Background Art

[0002] like Figure 1 As shown, the patch-type drug infusion device includes a drug storage chamber 3 and a ratchet drive assembly 4, wherein a piston 6 is provided in a sliding seal in the drug storage chamber 3, and the screw 7 connected to the piston 6 is driven by the action of the ratchet drive assembly 4 to move axially together with the piston 6, thereby realizing the push injection of the drug solution in the drug storage chamber;

[0003] During the infusion process, the drug storage bin 3 is connected to the infusion needle through a hose, and the problem of tube blockage may occur during the infusion process;

[0004] In the prior art, most of them use mechanical encoders to detect the rotation amount of the ratchet drive assembly 4 per unit time to calculate its rotation speed. When the actual rotation speed is less than the designed rotation speed, there is a problem of pipe blockage on the surface. In this solution, the mechanical encoder uses a metal spring to contact the shaft to transmit signals, which may cause poor contact and increase the friction resistance of the driving ratchet 41.

[0005] Another solution is to arrange a Hall sensor at the end of the medicine storage chamber 3 and set a magnet on the piston. When the piston 6 moves inside the medicine storage chamber 3, the displacement of the piston 6 is determined by detecting the Gaussian data on the Hall sensor, thereby determining whether the infusion needle is blocked. This structure cannot realize an infusion pump structure with a longer medicine storage chamber 3 due to the limitation of the detection distance of the Hall sensor.

[0006] In summary, how to solve the problems of poor contact of the mechanical encoder, increased resistance of the driving ratchet, or the detection distance limitation of the Hall sensor and the inability to apply a longer drug storage bin in the tube blockage monitoring of the patch-type drug infusion device is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a pipe blockage monitoring device, which monitors the rotation angle of the ratchet through the non-contact code disk and Hall element in the Hall encoder, thereby avoiding the problems of poor contact and increased rotation resistance of the ratchet, and at the same time uses a counting module to count the number of driving paddle actions, and calculates the difference between the ratchet rotation angle and the number of driving paddle actions. When the difference is greater than the set value, it indicates that the infusion device has a ratchet slip problem caused by pipe blockage. The monitoring result is accurate, is not limited by the length of the medicine storage bin, and has strong applicability.

[0008] Another object of the present invention is to provide a patch-type drug infusion device including the above-mentioned tube blockage monitoring device, which has the same technical features and can achieve the same effects.

[0009] Another object of the present invention is to provide a monitoring method applied to the above-mentioned tube blockage monitoring device, which can monitor the tube blockage of the patch-type drug infusion device in real time and can issue corresponding instructions in time when tube blockage occurs.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A tube blockage monitoring device, used for monitoring the tube blockage of a patch-type drug infusion device, comprising:

[0012] A Hall encoder is used to detect the rotation angle of the ratchet in the ratchet drive assembly, and includes a code disc and a Hall element. The code disc is fixedly installed coaxially with the ratchet, and the Hall element is fixedly arranged relative to the medicine storage bin and does not contact the code disc and the ratchet;

[0013] A counting module, used for counting the number of actions of the driving paddle in the ratchet driving assembly;

[0014] The operation processing module is used to calculate the difference between the number of times the driving paddle moves within a sampling period and the number of teeth corresponding to the rotation angle of the ratchet wheel, and output a setting instruction when the difference is greater than a comparison setting value.

[0015] Preferably, a plurality of groups of sampling identification points are evenly arranged in the code disk about its own rotation axis. When the sampling identification points move to the detection position of the Hall element, the Hall element can detect the sampling identification points and send a setting signal to the operation processing module.

[0016] Preferably, a magnet block is provided at the sampling identification point, and the magnet block is fixedly arranged on the circumferential surface of the code disk. When the magnet block is close to the Hall element and the normal of the magnet block overlaps with the normal of the Hall element, the Hall element can send a setting signal to the operation processing module.

[0017] Preferably, the number of the magnet blocks is four groups, and the number of ratchet teeth between two adjacent groups of magnet blocks is one quarter of the total number of ratchet teeth.

[0018] Preferably, the counting module is a normally open switch, and when the driving paddle is actuated, the normally open switch can be touched to cause it to send a counting instruction to the operation processing module.

[0019] Preferably, it also includes a medicine liquid counting module, which is used to count the number of sampling periods in which the difference counted in the operation processing module is not greater than the set comparison value. When the statistical number of the medicine liquid counting module is not less than the infusion set value, the ratchet drive assembly can be controlled to stop the action to stop the medicine liquid infusion.

[0020] A patch-type drug infusion device comprises any one of the above-mentioned tube blockage monitoring devices.

[0021] A monitoring method is applied to any one of the pipe blockage monitoring devices described above, and the monitoring method comprises the following steps:

[0022] Control the counting module to count the number of actions M of the driving paddle within the sampling period, and transmit the number M to the calculation processing module;

[0023] Control the Hall encoder to count the rotation angle N of the ratchet wheel within the sampling period, convert the number of teeth L of the ratchet wheel corresponding to the angle N, and transmit the number of teeth L to the operation processing module;

[0024] Controlling the operation processing module to calculate the difference between the number of times M and the number of teeth L;

[0025] If the difference is greater than the comparison setting value, the operation processing module is controlled to output a setting instruction.

[0026] Preferably, the operation processing module is controlled to calculate the difference between the number of times M and the number of teeth L;

[0027] If the difference is not greater than the comparison set value, the statistical value of the liquid medicine counting module is controlled to increase by one until the statistical value of the liquid medicine counting module is not less than the infusion set value, and the ratchet drive assembly is controlled to stop moving, otherwise the above-mentioned monitoring method continues to be executed.

[0028] Compared with the prior art, the pipe blockage monitoring device provided by the present invention has at least the following beneficial effects:

[0029] 1. The rotation angle of the ratchet is monitored through the non-contact Hall element and code disk in the Hall encoder, that is, the number of teeth rotating on the ratchet in unit time can be monitored, avoiding the problem of information transmission caused by poor contact, and also avoiding the problem of increased resistance to ratchet rotation caused by the contact detection mechanism;

[0030] 2. A counting module is added to simultaneously count the number of times the driving paddle moves, so as to compare the number of times the driving paddle moves and the number of teeth rotated by the ratchet in unit time. If the difference between the two is greater than the set value, it means that there is a problem of slippage between the ratchet and the driving paddle due to piston blockage during this time period. Compared with inferring the pipe blockage by detecting changes in the piston movement speed and the ratchet speed change, the detection accuracy of this application is higher, and it can avoid the misjudgment problem caused by drive circuit failure. Specifically, if the drive circuit fails, the number of times the driving paddle moves and the number of teeth rotated by the ratchet are both zero, and the difference between the two is zero, which means that pipe blockage is ruled out.

[0031] The patch-type drug infusion device provided by the present invention includes the above-mentioned tube blockage monitoring device and has the same beneficial effects.

[0032] The monitoring method provided by the present invention is applied to the above-mentioned pipe blockage monitoring device. By calculating the difference between the number of actions of the driving paddle and the number of rotating teeth of the ratchet, the pipe blockage situation can be quickly and accurately determined, and the misjudgment problem caused by a driving circuit failure can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the structure of the tube blockage monitoring device and the patch-type drug infusion device provided by the present invention;

[0035] Figure 2 A schematic structural diagram of a specific monitoring device and a patch-type drug infusion device provided by the present invention from another perspective;

[0036] Figure 3 A top view of a specific monitoring device and a patch-type drug infusion device provided by the present invention;

[0037] Figure 4 The present invention is a flow chart of a specific monitoring method provided by the present invention.

[0038] Figure 1-Figure 4 middle:

[0039] 1. Hall encoder; 11. Code disk; 12. Hall element; 13. Fixing bracket

[0040] 2. Counting module;

[0041] 3. Medicine storage warehouse;

[0042] 4. ratchet drive assembly; 41. ratchet; 42. drive paddle; 43. non-return paddle; 44. memory alloy wire;

[0043] 5. Reset mechanism;

[0044] 6. Piston;

[0045] 7. Screw. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The core of the present invention is to provide a pipe blockage monitoring device, which monitors the rotation angle of the ratchet through the non-contact code disk and Hall element in the Hall encoder, thereby avoiding the problems of poor contact and increased ratchet rotation resistance. At the same time, a counting module is used to count the number of driving paddle actions, and calculate the difference between the ratchet rotation angle and the number of driving paddle actions. When the difference is greater than the set value, it indicates that the infusion device has a ratchet slip problem caused by pipe blockage. The monitoring result is accurate, is not limited by the length of the drug storage bin, and has strong applicability.

[0048] Another core of the present invention is to provide a patch-type drug infusion device including the above-mentioned tube blockage monitoring device, which has the same technical features and can achieve the same effect.

[0049] Another core of the present invention is to provide a monitoring method applied to the above-mentioned tube blockage monitoring device, which can monitor the tube blockage situation of the patch-type drug infusion device in real time and can issue corresponding instructions in time when tube blockage occurs.

[0050] Please refer to Figure 1-Figure 3 , a tube blockage monitoring device, used for monitoring the tube blockage of a patch-type drug infusion device, comprising:

[0051] The Hall encoder 1 is used to detect the rotation angle of the ratchet 41 in the ratchet drive assembly 4, and includes a code disc 11 and a Hall element 12. The code disc 11 is coaxially fixedly installed with the ratchet 41, and the Hall element 12 is relatively fixedly arranged with the medicine storage bin 3 and does not contact with the code disc 11 and the ratchet 41;

[0052] A counting module 2, used for counting the number of actions of the driving paddle 42 in the ratchet driving assembly 4;

[0053] The calculation processing module is used to calculate the difference between the number of actions of the driving paddle 42 and the number of teeth corresponding to the rotation angle of the ratchet 41 within the sampling period, and output a setting instruction when the difference is greater than the comparison setting value;

[0054] like Figure 1 As shown, the infusion of the patch-type drug infusion device mainly depends on the rotation of the ratchet 41. The threaded connection between the ratchet 41 and the screw 7 is used to drive the screw 7 to feed axially, thereby pushing the piston 6 to feed, thereby achieving drug infusion;

[0055] The rotation of the ratchet 41 depends on the conversion of the memory alloy wire 44 between the stretched state and the contracted state when energized, combined with the non-return function of the non-return paddle 43 on the ratchet 41, thereby realizing the stepping drive of the ratchet 41. At the same time, a reset mechanism 5 is integrated in the ratchet drive assembly 4, so that the screw 7 and the piston 6 are not affected by the ratchet drive assembly 4 when they move in the reverse direction. The reset mechanism 5 refers to the design in the prior art and will not be elaborated here.

[0056] The present application adopts a Hall encoder 1 to count the rotation angle of the ratchet 41, that is, the number of rotating teeth of the ratchet 41, which effectively solves the problem of signal loss caused by poor contact of the traditional mechanical encoder and increased rotation resistance of the ratchet 41 caused by contact measurement; specifically, a code disk 11 is coaxially arranged on the ratchet 41, and a Hall element 12 is non-contacted with the code disk 11, so as to perform non-contact measurement. When the code disk 11 rotates with the ratchet 41, the Hall element 12 can record the rotation angle of the code disk 11, and then record the number of rotating teeth of the ratchet 41; wherein the Hall element 12 is fixedly arranged relative to the medicine storage bin 3 through a fixing frame 13;

[0057] In addition, a counting module 2 is added to record the number of actions of the driving paddle 42, and the number of actions of the driving paddle 42 and the number of rotating teeth of the ratchet 41 are compared through the calculation processing module. Under normal circumstances, the driving paddle 42 is moved once, and the driving ratchet 41 rotates one tooth position. When the pipe is blocked, the feeding of the piston 6 is blocked, causing the rotation resistance of the ratchet 41 to increase, which leads to slipping between the driving paddle 42 and the ratchet 41, that is, the number of actions of the driving paddle 42 and the number of rotating teeth of the ratchet 41 do not match, resulting in a difference. However, considering that during the infusion of the liquid medicine, there is a problem of deformation of the pipeline under pressure, which will also have a resistance effect on the feeding of the piston 6, the above-mentioned effect is eliminated by presetting the comparison setting value, that is, when the difference between the number of actions of the driving paddle 42 and the number of rotating teeth of the ratchet 41 is within the range of the comparison setting value, it is not determined as a pipe blockage to avoid misjudgment. Only when the difference exceeds the range of the comparison setting value, it is determined as a pipe blockage, and then a set instruction is sent, such as controlling the ratchet drive assembly 4 to stop the action, to avoid the continuous occurrence of slipping teeth;

[0058] When setting the sampling period, the ratchet wheel 41 may rotate a set angle as one sampling period, or the ratchet wheel 41 may rotate a set time as one sampling period;

[0059] The rotation angle of the ratchet wheel 41 is set as a sampling cycle, that is, in each sampling cycle, the piston 6 has the same feeding amount. By counting the sampling cycles that meet the conditions, the total amount of liquid medicine infusion can be calculated, which is convenient for statistics, and the statistical results are not affected by the liquid medicine infusion speed;

[0060] The rotation time of the ratchet wheel 41 is set as a sampling period, and the rotation angle of the ratchet wheel 41 within the set time can be counted, that is, the feed amount of the piston 6 per unit time can be calculated, which is convenient for calculating the infusion speed of the liquid medicine.

[0061] In some embodiments, a plurality of groups of sampling identification points are evenly arranged in the code disk 11 about its own rotation axis. When the sampling identification points move to the detection position of the Hall element 12, the Hall element 12 can detect the sampling identification points and send a setting signal to the operation processing module;

[0062] like Figure 1 As shown, a plurality of groups of sampling identification points are arranged in a circular array on the code disk 11, and a fixed number of teeth of the ratchet 41 are provided between two adjacent groups of sampling identification points, i.e., the detection of two groups of sampling identification points by the Hall element 12 is regarded as a sampling period, so the ratchet 41 is fed with the same number of teeth within a sampling period, i.e., the piston 6 is fed with the same feed amount; by changing the total number of teeth of the ratchet 41 or changing the number of sampling identification points on the code disk 11, the corresponding number of teeth within each sampling period can be changed, thereby adjusting the monitoring accuracy, and the monitoring accuracy decreases with the increase of the number of teeth within a single sampling period.

[0063] In some embodiments, a magnet block is provided at the sampling mark point, and the magnet block is fixedly arranged on the circumferential surface of the code disk 11. When the magnet block is close to the Hall element 12 and the normal line of the magnet block overlaps with the normal line of the Hall element 12, the Hall element 12 can send a setting signal to the operation processing module;

[0064] like Figure 1 As shown, the magnet block is used as the sampling identification point, which is easy to be recognized by the Hall element 12, and after recognition, the setting signal is sent to the operation processing module as the interval point of the sampling cycle.

[0065] In some embodiments, the number of magnet blocks is four groups, and the number of teeth of the ratchet 41 between two adjacent groups of magnet blocks is one-fourth of the total number of teeth of the ratchet 41;

[0066] like Figure 1As shown, four groups of magnet blocks are used as four groups of sampling marking points, and the ratchet wheel 41 has 80 teeth, that is, there are 20 teeth between two adjacent groups of sampling marking points, that is, the ratchet wheel 41 feeds 20 teeth positions in each sampling cycle.

[0067] In some embodiments, the counting module 2 is a normally open switch. When the driving paddle 42 is actuated, the normally open switch can be touched, so that the normally open switch sends a counting instruction to the operation processing module.

[0068] like Figure 1 As shown, a normally open switch is provided on the action path of the driving paddle 42. When the driving paddle 42 moves, it can touch the contact normally open switch or block the non-contact normally open switch to close it, thereby completing the counting of the number of actions of the driving paddle 42.

[0069] In some embodiments, a normally closed switch is provided on the action path of the driving paddle 42. When the driving paddle 42 is actuated, it can touch the contact normally closed switch or block the non-contact normally closed switch to open the circuit, thereby completing the counting of the number of times the driving paddle 42 is actuated, which also falls within the protection scope of the present application.

[0070] In some embodiments, a liquid medicine counting module is further included, which is used to count the number of sampling cycles in which the difference value counted in the calculation processing module is not greater than the set comparison value. When the number of statistics of the liquid medicine counting module is not less than the infusion setting value, the ratchet drive assembly 4 can be controlled to stop the action to stop the liquid medicine infusion;

[0071] In each sampling cycle, the number of times the driving paddle 42 moves is compared with the feeding tooth position of the ratchet wheel 41. When the difference between the two is less than the set value, it is determined that the tube is not blocked and it is in a normal infusion state, that is, the infusion of a sampling cycle is completed normally. In the setting of a fixed feeding tooth position of the ratchet wheel 41 as a sampling cycle, the amount of liquid medicine infused in each sampling cycle is fixed, that is, by counting the number of sampling cycles completed normally, the total amount of liquid medicine infused can be counted;

[0072] For a fixed time as a sampling period, calculate the infusion rate and combine it with the total infusion time to calculate the total amount of drug solution infusion.

[0073] In addition to the tube blockage monitoring device disclosed in the above embodiments, the present invention also provides a patch-type drug infusion device including the above-mentioned tube blockage monitoring device. For the structures of other parts of the patch-type drug infusion device, please refer to the prior art and will not be described in detail herein.

[0074] In addition to the pipe blockage monitoring device disclosed in each of the above embodiments, the present invention also provides a monitoring method applied to the above pipe blockage monitoring device, and the monitoring method includes the following steps:

[0075] The control counting module 2 counts the number of actions M of the driving paddle 42 within the sampling period, and transmits the number M to the calculation processing module;

[0076] Control the Hall encoder 1 to count the rotation angle N of the ratchet 41 within the sampling period, convert the number of teeth L of the ratchet 41 corresponding to the angle N, and transmit the number of teeth L to the calculation processing module;

[0077] The control operation processing module calculates the difference between the number of times M and the number of teeth L;

[0078] If the difference is greater than the comparison setting value, the control operation processing module outputs the setting instruction;

[0079] like Figure 4 As shown, within a sampling period, the number of actions of the driving paddle 42 is counted to obtain the number M, and the number is transmitted to the operation processing module; at the same time, within the sampling period, the feeding teeth of the ratchet 41 are counted to obtain the number of teeth L, and the number is transmitted to the operation processing module; M and L are compared in the operation processing module, and when the difference between the two is greater than the comparison setting value, it is determined that the tube is blocked, that is, an instruction to stop the infusion is output, so that the driving paddle 42 stops moving; if the difference between the two is less than the comparison setting value, M and L are simultaneously assigned to zero, and a new sampling period of cyclic monitoring is performed until the infusion is completed or the difference between the two is greater than the comparison setting value, and an instruction to stop the infusion is output.

[0080] In some embodiments, the control operation processing module calculates the difference between the number of times M and the number of teeth L;

[0081] If the difference is not greater than the comparison setting value, the statistical value of the liquid medicine counting module is controlled to increase by one until the statistical value of the liquid medicine counting module is not less than the infusion setting value, and the ratchet drive assembly 4 is controlled to stop the action, otherwise the above-mentioned monitoring method is continued to be executed;

[0082] During the monitoring process, the integrated drug liquid counting module counts the sampling cycles in which the difference between M and L is not greater than the comparison set value, until the count value is not less than the infusion set value, that is, the required amount of drug liquid infusion is reached, and the output control stops the output command, otherwise the infusion operation and tube blockage monitoring continue.

[0083] like Figure 1 As shown, taking the ratchet 41 having 80 teeth and the code disc 11 having 4 sampling identification points as an example, that is, each sampling cycle corresponds to 20 teeth. Considering the expansion and contraction of the infusion pipeline, 10 comparison values ​​are added on the basis of 20 tooth positions, that is, the comparison setting value is set to 30;

[0084] During the monitoring process, in the initial stage, when the Hall element 12 detects the magnet block, the statistical values ​​of the Hall encoder 1 and the counting module 2 are cleared, and L and M are assigned zero; when the medicine is infused, the memory alloy wire 44 is controlled to pass a pulse current to switch between the stretched state and the contracted state, driving the drive paddle 42 to move. The drive paddle 42 moves once, and the statistical value of the counting module 2 is increased by one. After the pulse current is input, within a delay of 1000ms, monitor whether the statistical value of the counting module 2 changes. If the value of the counting module 2 is detected to change, it proves that the drive paddle 42 is operating normally. If the value of the counting module 2 is not detected to change, it means that the drive paddle 42 is not operating normally, and there is a circuit fault or a problem of slipping teeth. At this time, the machine should be stopped for inspection.

[0085] At the same time, in the Hall encoder 1, when the Hall element 12 detects the magnet block on the code disk 11, it is compared with the statistical value of the counting module 2 at this time. If the value is greater than 30, it is determined that the pipe is blocked and a stop command is output; if the value is less than 30, it is determined that the infusion is normal. At this time, the value of the liquid medicine counting module is increased by one, and the statistical value of the liquid medicine counting module is compared with the infusion setting value. If the statistical value of the liquid medicine counting module is not less than the infusion setting value, an instruction to stop the infusion is output, otherwise, the above monitoring cycle is continued.

[0086] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0087] The above is a detailed introduction to the tube blockage monitoring device, patch-type drug infusion device and monitoring method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A tube blockage monitoring device for monitoring the tube blockage of a patch-type drug infusion device, characterized in that: include: A Hall encoder (1) for detecting the rotation angle of a ratchet (41) in a ratchet drive assembly (4), comprising a code disc (11) and a Hall element (12), wherein the code disc (11) and the ratchet (41) are coaxially fixedly mounted, and the Hall element (12) is fixedly arranged relative to the medicine storage bin (3) and does not contact the code disc (11) and the ratchet (41); A counting module (2) for counting the number of times the driving paddle (42) in the ratchet drive assembly (4) moves; The calculation processing module is used to calculate the difference between the number of times the driving paddle (42) moves within a sampling period and the number of teeth corresponding to the rotation angle of the ratchet (41), and output a setting instruction when the difference is greater than a comparison setting value.

2. The pipe blockage monitoring device according to claim 1, characterized in that: A plurality of groups of sampling identification points are evenly arranged in the code disk (11) about its own rotation axis. When the sampling identification points move to the detection position of the Hall element (12), the Hall element (12) can detect the sampling identification points and send a setting signal to the operation processing module.

3. The pipe blockage monitoring device according to claim 2, characterized in that: A magnet block is provided at the sampling mark point, and the magnet block is fixedly arranged on the circumferential surface of the code disk (11). When the magnet block approaches the Hall element (12) and the normal line of the magnet block overlaps with the normal line of the Hall element (12), the Hall element (12) can send a setting signal to the operation processing module.

4. The pipe blockage monitoring device according to claim 3, characterized in that: The number of the magnet blocks is four groups, and the number of teeth of the ratchet (41) between two adjacent groups of magnet blocks is one quarter of the total number of teeth of the ratchet (41).

5. The pipe blockage monitoring device according to claim 1, characterized in that: The counting module (2) is a normally open switch, and when the driving paddle (42) is in motion, it can touch the normally open switch, causing it to send a counting instruction to the operation processing module.

6. The pipe blockage monitoring device according to claim 1, characterized in that: It also includes a liquid medicine counting module, which is used to count the number of sampling periods in which the difference value counted in the operation processing module is not greater than the set comparison value. When the number of times counted by the liquid medicine counting module is not less than the infusion set value, the ratchet drive assembly (4) can be controlled to stop moving, thereby stopping the infusion of liquid medicine.

7. A patch-type drug infusion device, characterized in that: A pipe blockage monitoring device comprising any one of claims 1 to 6.

8. A monitoring method, characterized in that: The pipe blockage monitoring device according to any one of claims 1 to 6, wherein the monitoring method comprises the following steps: Controlling the counting module (2) to count the number of actions M of the driving paddle (42) within the sampling period, and transmitting the number M to the calculation processing module; Controlling the Hall encoder (1) to count the rotation angle N of the ratchet (41) within the sampling period, converting the number of teeth L of the ratchet (41) corresponding to the angle N, and transmitting the number of teeth L to the operation processing module; Controlling the operation processing module to calculate the difference between the number of times M and the number of teeth L; If the difference is greater than the comparison setting value, the operation processing module is controlled to output a setting instruction.

9. The monitoring method according to claim 8, characterized in that: Controlling the operation processing module to calculate the difference between the number of times M and the number of teeth L; If the difference is not greater than the comparison set value, the statistical value of the liquid medicine counting module is controlled to increase by one until the statistical value of the liquid medicine counting module is not less than the infusion set value, and the ratchet drive assembly (4) is controlled to stop moving, otherwise the above-mentioned monitoring method continues to be executed.

Images