High-reliability low-temperature plasma sterilizer medicine injection device
By adding induction sheets and sensors to the injection device of the low-temperature plasma sterilizer, closed-loop control of X-direction movement is achieved, sterilization failure caused by X motor loss is solved, and the reliability and accuracy of the device are improved.
Patent Information
- Application Number
- CN202422290739.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The injection device of the existing low-temperature plasma sterilizer causes the Y motor to continue to operate when the X motor is lost, resulting in frequent sterilization failures, and existing solutions such as the cost of using a servo motor is too high.
By adding induction tablets and sensors to the injection device, combined with sensor signal feedback, closed-loop control of X-direction movement is achieved, and limit adjustment in Y-direction is coordinated to ensure the accuracy of drug extraction.
Without increasing hardware costs, the reliability of the drug injection device is significantly improved, sterilization failure is avoided, and the failure incidence is reduced.
Smart Images
Figure CN223170043U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a drug injection device for a highly reliable low-temperature plasma sterilizer. Background Technique
[0002] The working principle of a hydrogen peroxide low-temperature plasma sterilizer is to make various microorganisms on medical devices and surgical instruments lose their activity through processes such as the diffusion and plasmaization of hydrogen peroxide gas under vacuum, thereby achieving the sterilization effect. When the low-temperature plasma hydrogen peroxide sterilizer works, it is necessary to add hydrogen peroxide solution (medicine solution) to complete the established functions. The initial drug addition method was generally to manually fill it into the storage tank in the device. However, since the hydrogen peroxide required for sterilization by the hydrogen peroxide low-temperature plasma sterilizer is a high-concentration hydrogen peroxide solution with a concentration of 53-60%, it has strong oxidizing and corrosive properties. When manually filling, it is not only difficult to accurately quantitatively fill, but also there are great risks of personal injury and other potential safety hazards caused by incorrect operations. Currently, few manufacturers use this method. In the current market, the vast majority of manufacturers use a cartridge-type drug injection device. The hydrogen peroxide medicine solution is pre-sealed in a soft capsule, and then the prepared capsule is placed in the corresponding position of a rigid plastic shell, and the shell is sealed using processes such as ultrasonic welding, eliminating the possibility of direct hand contact with hydrogen peroxide. Compared with the manual filling scheme, it effectively improves the safety during the process of filling the medicine solution and the controllability of the medicine solution dosage.
[0003] However, to use a cartridge, it is necessary to configure a dedicated medicine extraction device for the equipment to achieve the extraction of the medicine solution during the sterilization process. Whether the medicine solution can be successfully extracted will have a great impact on the reliability of the entire sterilization effect.
[0004] Currently, most manufacturers' drug injection devices mostly use a linear motion mechanism to drive the cartridge to move (referred to as the movement in the X direction here), and cooperate with a linear motion mechanism to drive the liquid extraction needle to move (referred to as the movement in the Y direction here). At a specific fixed position in the X direction, by operating the forward and backward movement of the liquid extraction needle in the Y direction, the extraction of the medicine solution in each capsule in the cartridge can be achieved. In addition, there are also those on the market that use a rotary motion mechanism to drive the cartridge to rotate (referred to as the rotation in the X-axis direction here), and cooperate with a linear motion mechanism to drive the liquid extraction needle to move (referred to as the movement in the Y direction here). Similarly, by controlling at a specific fixed angle position in the X-axis direction and manipulating the forward and backward movement of the liquid extraction needle in the Y direction, the extraction of the medicine solution in each capsule in the cartridge can be achieved.
[0005] While these solutions differ slightly, current injectors utilize stepper motors for their power components due to factors such as cost and structure. Stepper motors offer competitive advantages in terms of cost and precision, but they also have inherent flaws such as step loss. For example, in an injector, if motor X experiences a significant step loss (a rare occurrence), motor Y will continue dispensing due to the open-loop control scheme. As a result, as the sterilization process continues, this can trigger sterilizer alarms and other sterilization failures.
[0006] Currently, manufacturers typically minimize the occurrence of these types of failures through software solutions like program optimization. However, as the scale of use of this type of equipment continues to expand, these small-probability failures have become more frequent. For an increasing number of customers, the small probability of medication failure has become increasingly unacceptable. For device manufacturers, the increasing number of products on the market has led to a more prominent after-sales service issue for these types of failures, creating a more urgent need to address these defects.
[0007] To address these issues, the reliability of the medication removal process needed to be further improved. Specifically, the logic for X- and Y-direction movement needed to be correct. In short, the goal was to ensure that Y-direction movement would only occur at a specific X position (within a certain accuracy).
[0008] Generally speaking, the main technical means to achieve this goal is to replace the X-motor with a servo motor, thereby achieving closed-loop control of X-direction motion. Given the accuracy of servo motors, this can generally achieve this goal perfectly. However, the increased cost associated with servo motors is also an objective reality that is difficult to accept for such devices.
[0009] Therefore, the core of this solution is to provide a feasible solution to achieve the above-mentioned purpose through minor improvements in structure and control without significantly increasing costs. Utility Model Content
[0010] The purpose of the present utility model is to provide a high-reliability low-temperature plasma sterilizer injection device to solve the problem mentioned in the above background technology that for the injection device, when the X motor loses steps seriously (with a small probability), due to the open-loop control scheme, the Y motor will continue to perform the medicine-taking operation. As a result, as the sterilization process continues, it will cause the sterilizer alarm and other sterilization failure problems.
[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a high-reliability low-temperature plasma sterilizer injection device, comprising a sensor sheet, a capsule and a cartridge slot, wherein the sensor sheet is provided with a sensing hole below the acupuncture device, and the sensing hole is provided with a sensor capable of identifying the hole.
[0012] A cartridge is inserted into the interior of the cartridge slot, and the cartridge contains capsules. The upper and lower ends of the capsules are provided with puncture holes, and the height of the puncture holes corresponds to the height of the output end of the puncturing device. A Y motor is installed at the bottom end of the puncturing device.
[0013] A proximity switch is installed on the side of the cartridge, and a card reader board is provided on the side of the end of the cartridge away from the proximity switch. An air filter is inlaid on the back of the cartridge, and a far limit position inlaid on the cartridge is provided on the upper side of the air filter. A linear guide rail is fixedly installed at the middle position of the back of the cartridge, and the linear guide rail is connected to the X motor.
[0014] Preferably, the initial position of the cartridge controlled by the X motor is set as the X origin, and the initial position of the puncturing device controlled by the Y motor is set as the Y origin.
[0015] Preferably, during the movement of the cartridge in the X direction, when the size of the sensing hole is smaller than the width of the puncture hole, when the cartridge needs to move to the Nth capsule, the cartridge will be controlled back to the X origin.
[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0017] 1. By setting and modifying the structural components in the medicine adding device, the original open-loop control system is transformed into a control system with certain closed-loop capabilities. Compared with closed-loop control systems such as servo motors, the transformation method of this patent is more economical. The core lies in that by improving the accuracy of limited positions, the reliability of the entire device can be greatly improved. In cooperation with different control schemes, various transformation schemes such as adding and modifying the original device can be carried out, and the transformation space is larger, which has great reference significance for the medicine injection devices of each manufacturer.
[0018] 2. When the hardware cost remains almost unchanged, the upgrade of the entire device can be completed, which brings an improvement in the reliability of the entire device. Theoretically, motors with open-loop control can achieve the effect of closed-loop (closed-loop of limited positions), and the possibility of such failures can be fundamentally and completely solved.
[0019] 3. The implementation is simple. Theoretically, all types of medicine injection devices can follow this idea to add or modify corresponding sensing devices to complete the improvement of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model;
[0021] Figure 2 It is a front structural schematic diagram of the present utility model;
[0022] Figure 3 It is a bottom-up structural schematic diagram of the present utility model in the Y direction;
[0023] Figure 4 This is a schematic diagram of the top view of the structure of the utility model;
[0024] Figure 5 This is a side view of the structure of the utility model;
[0025] Figure 6 It is a rear view structural diagram of the utility model.
[0026] In the figure: 1. Sensor plate; 2. Capsule; 3. Cartridge slot; 4. Cartridge; 5. Proximity switch; 6. Acupuncture device; 7. Card reader; 8. Sensor; 9. X origin; 10. Y motor; 11. X motor; 12. Sensor hole; 13. Acupuncture hole; 14. Remote limit; 15. Y origin; 16. Air filter; 17. Linear guide. DETAILED DESCRIPTION
[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.
[0028] See also Figure 1-6 , an embodiment provided by the utility model:
[0029] A high-reliability low-temperature plasma sterilizer injection device includes a sensing sheet 1, a capsule 2, and a cartridge slot 3. The sensing sheet 1 is provided with a sensing hole 12 below the acupuncture device 6, and a sensor 8 for identifying the hole is provided on the sensing hole 12.
[0030] A cartridge 4 is inserted into the cartridge slot 3, and the cartridge 4 contains a capsule 2. Puncture holes 13 are provided at the upper and lower ends of the capsule, and the height of the puncture holes 13 corresponds to the height of the output end of the puncture device 6. A Y motor 10 is installed at the bottom end of the puncture device 6.
[0031] A proximity switch 5 is installed on the side of the cassette 4, and a card reader plate 7 is provided on the side of the end of the cassette 4 away from the proximity switch 5. An air filter 16 is embedded on the back of the cassette 4, and a far limit 14 embedded on the cassette 4 is provided on the upper side of the air filter 16. A linear guide rail 17 is fixedly installed in the middle position of the back of the cassette 4, and the linear guide rail 17 is connected to the X motor 11.
[0032] like Figure 1As shown, below the cartridge device, in this embodiment, by adding an induction sheet with an induction hole, the specific specification of the induction hole in the induction sheet should be the minimum recognition size of the sensor used, or slightly larger than the minimum recognition size of the sensor. It should be noted here that the minimum recognition size of the selected sensor is recommended to be smaller than the width size of the acupuncture hole. It does not exclude the use of a sensor with a minimum recognition size larger than the width size of the acupuncture hole, and the specific difference is the actual control scheme.
[0033] As Figure 2 shown, when the cartridge device moves back and forth in the X direction, when the induction hole on the induction sheet has not reached the sensor induction position, the sensor signal output is in one state (it can maintain a high level or a low level). And when the induction hole on the induction sheet reaches the sensor induction position, the output state of the sensor should reverse.
[0034] In this embodiment, during the movement in the X direction, when the size of the induction hole is smaller than the width of the acupuncture hole, the specific working process of the induction sheet is as follows: When the cartridge device needs to move to the Nth capsule, the cartridge device will be controlled back to the origin, and then start from the origin and move a fixed distance. During the operation, record the number of times the level inversion is transmitted back by the induction sheet, which should be consistent with the ideal number. After the comparison between the two is correct, perform the acupuncture action.
[0035] In addition, when the size of the induction hole is smaller than the width of the acupuncture, the following process can also be used for operation: When the cartridge device needs to move to the Nth capsule, the cartridge device first returns to the origin, and then starts from the origin and runs at a set speed. During the operation, record the number of times the level inversion is transmitted back by the induction sheet. When it is consistent with the set value, stop immediately, and send a fixed pulse according to the pre - debugging data. After reaching the set position, perform the acupuncture action.
[0036] In this embodiment, when the size of the induction hole is larger than the width of the acupuncture hole, the specific working process of the induction sheet should be adjusted as follows: When the cartridge device needs to move to the Nth capsule, the cartridge device first returns to the origin, and then starts from the origin and moves a fixed distance. During the operation, record the number of times the level inversion is transmitted back by the induction sheet. When capturing the last required inversion signal, record the pulse difference between the arrival at the final position and the acquisition of the inversion signal, and compare it with the set ideal value. If it is within a reasonable error range, the acupuncture action can be performed.
[0037] In addition, when the size of the induction hole is larger than the width of the acupuncture hole, the following process can also be used for operation: When the cartridge device needs to move to the Nth capsule, the cartridge device first returns to the origin, and then starts from the origin and runs at a set speed. During the operation, record the number of times the level inversion is transmitted back by the induction sheet. When it is consistent with the set number of inversions, stop immediately, and send a fixed pulse according to the pre - debugging data. After reaching the set position, perform the acupuncture action.
[0038] AsFigure 3 As shown, in this embodiment, in the Y direction, by reasonably adjusting the position of the far limit sensor, on the basis of the safety limit function of the far limit, a reliability function for controlling the Y direction of the needle punching action can be added. Its specific working process is that when the needle punching action needs to be executed, the Y motor first returns to the origin, and the control program sends fixed pulses to make the needle punching device move a fixed distance. When reaching the far limit, the needle should be exactly at the ideal position of the needle punching action, and at this time, the far limit should be able to feedback the in-place signal. When the far limit signal is not captured, the control system can execute control methods such as re-needle punching or supplementing a certain number of pulses to complete the needle punching.
[0039] It should be noted that this embodiment is not all of the implementation solutions of this patent. Just like the specific implementation solutions mentioned in the above examples, it does not exclude that in the X direction, a method similar to that in the Y direction can also be used, that is, by setting a fixed mutual relationship between the sensing holes and the needle punching holes, and then achieving the control purpose by capturing the feedback signals of the corresponding positions.
[0040] Similarly, the solution of arranging multiple sensors instead of multiple holes on the sensing sheet should also be under the protection of this patent.
[0041] Similarly, the implementation solutions that achieve the same purpose by exchanging the positions of the sensing sheet and the sensor should also be under the protection of this patent.
[0042] It should be emphasized here that the core of this patent is an implementation solution that simply realizes the transformation from open-loop control to closed-loop control (simple closed-loop or limited closed-loop, not a true closed-loop) by setting or modifying mechanical structural parts and using the shape features and dimensional accuracies of these parts.
[0043] This solution adds a sensing sheet to the cartridge device, arranges corresponding openings below the needle punching position of the cartridge, and adds a sensor that can identify these holes. When the cartridge device moves to these holes, through the change in the output of the sensor signal and the corresponding algorithm of the program, it is determined whether the X position of the cartridge device is correct, and then the accurate and reliable X position is achieved. Correspondingly, through the reasonable setting of the Y far limit, the reliable execution of the needle punching action of the liquid taking needle can also be realized.
[0044] Its core lies in adding a sensing part, and the feature of this sensing part is that its sensing position needs to have a one-to-one correspondence with the needle punching position of the liquid taking needle and there is a certain relative position relationship. In this way, through the signal transmitted back by the sensor identifying the corresponding sensing position of the added sensing part, through a certain operation and control, it can be ensured that the position to be needle punched in the X direction will always be at the ideal position or at a position with extremely small error.
[0045] It should be emphasized that this solution should not be simply understood as a solution that simply adds an induction element on the original basis and feeds back the induction signal to solve various problems of the device. For example, in the following embodiments, the same purpose can also be achieved by reasonably adjusting the specifications of the original induction element or the position of the sensor, which is also a solution of this technical solution.
[0046] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the instructions shown in the drawings and the above; however, any slight changes, modifications and evolutions made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims
1. A drug injection device for a highly reliable low-temperature plasma sterilizer, comprising an induction sheet (1), a capsule (2) and a cartridge slot (3), characterized in that: An induction hole (12) is arranged below the position of the needle-punching device (6) on the induction sheet (1), and a sensor (8) capable of recognizing the hole is arranged on the induction hole (12). A cartridge (4) is inserted into the cartridge slot (3), and the cartridge (4) contains a capsule (2). Needle-punching holes (13) are arranged at both upper and lower ends of the capsule, and the height of the needle-punching holes (13) corresponds to the height of the output end of the needle-punching device (6). A Y motor (10) is installed at the bottom end of the needle-punching device (6). A proximity switch (5) is installed on the side of the cartridge (4), and a card reader board (7) is arranged on the side of one end of the cartridge (4) away from the proximity switch (5). An air filter (16) is inlaid on the back of the cartridge (4), and a far limit (14) inlaid on the cartridge (4) is arranged on the upper side of the air filter (16). A linear guide rail (17) is fixedly installed at the middle position of the back of the cartridge (4), and the linear guide rail (17) is connected to an X motor (11).
2. The drug injection device of a highly reliable low-temperature plasma sterilizer according to claim 1, wherein: The X motor (11) controls the initial position of the cartridge (4) to be set as the X origin (9), and the Y motor (10) controls the initial position of the needle-punching device (6) to be set as the Y origin (15).
3. The drug injection device of a highly reliable low-temperature plasma sterilizer according to claim 1, characterized in that: The specific specification of the induction hole (12) in the induction sheet (1) should be the minimum recognition size of the used sensor (8), or slightly larger than the minimum recognition size of the sensor (8).
4. The drug injection device of a highly reliable low-temperature plasma sterilizer according to claim 2, characterized in that: During the movement of the cartridge (4) in the X direction, when the size of the induction hole (12) is smaller than the width of the needle-punching hole, when it is necessary for the cartridge (4) to move to the Nth capsule (2), the cartridge (4) will be controlled back to the X origin (9).