Reciprocating type driving structure and liquid medicine infusion device with same

Abstract

The invention relates to the technical field of transmission devices, in particular to a reciprocating type driving structure and a liquid medicine infusion device with the same, the driving structure comprises a driving part and at least two transmission arms, one ends of the two transmission arms are connected with the driving part and can be driven by the driving part to reciprocate, and the other ends of the two transmission arms abut against a driving wheel. Gear teeth are evenly distributed on the periphery of the driving wheel, and a tooth groove is formed between every two adjacent gear teeth. According to the reciprocating type driving structure, through cooperation of the pawls and the inner walls of the tooth grooves, efficient conversion from linear motion of the driving structure to rotating motion of the driving wheel is achieved, when the driving part drives the transmission arm to do reciprocating motion, the pawls can alternately push and disengage in the tooth grooves, the driving wheel can continuously do one-way rotation, the transmission efficiency is doubled, and the service life of the driving wheel is prolonged. And the stability and the reliability of power transmission are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices, and in particular to a reciprocating drive structure and a drug liquid infusion device having the structure. Background Art

[0002] In the field of modern medical devices, miniaturized drug infusion instruments have gradually become an important tool for patients' daily treatment due to their portability, accuracy, and ease of operation. This type of instrument achieves precise infusion of drug solutions through a built-in gear drive structure. However, the gear drive structure used in miniaturized drug infusion instruments in the existing technology has exposed many problems in actual application, especially low drive efficiency. In actual use, the inefficient gear drive structure requires the instrument to consume more power during the infusion process to maintain the same infusion effect. This not only shortens the instrument's battery life, but may also lead to a decrease in infusion accuracy, affecting the patient's treatment effect.

[0003] While there are currently some improvements on the market, most of these measures have failed to fundamentally address the aforementioned issues. For example, some products extend battery life by increasing battery capacity, but this increases the size and weight of the device, defeating the original purpose of miniaturization. Other products attempt to reduce friction by optimizing gear surface treatment, but this has limited effectiveness and is costly. Therefore, developing a new structure that can significantly improve gear drive efficiency under limited power conditions is of great practical significance for improving the overall performance of miniaturized drug infusion devices. Summary of the Invention

[0004] In order to solve the problems of low transmission efficiency and poor stability of the existing gear drive structure, the present invention provides a reciprocating drive structure and a drug infusion device having the structure. The driving part drives the two transmission arms that are offset against the driving wheel to perform reciprocating motion. Each reciprocating motion can drive the gear to rotate twice. Under the condition of limited electric energy, the transmission efficiency is doubled, which greatly reduces the power consumption, effectively extends the battery life of the instrument, and meets the requirements of miniaturization of the drug infusion device.

[0005] The present invention provides a reciprocating drive structure for driving a gear assembly for rotation. The gear assembly includes a driving wheel and at least one driven wheel. The drive structure includes a driving unit and at least two transmission arms. One end of each transmission arm is connected to the driving unit and can be driven to reciprocate by the driving unit. The other ends of the two transmission arms abut against the driving wheel, and are used to convert the reciprocating motion of the transmission arms into the rotational motion of the driving gear. When the driving unit drives the transmission arms to reciprocate, a corresponding force is generated at the abutment between the transmission arms and the driving gear to drive the driving wheel to rotate. Both transmission arms can perform work during each reciprocating motion, thereby achieving the effect of driving the driving wheel to rotate twice during each reciprocating motion, doubling the transmission efficiency without increasing energy consumption.

[0006] Furthermore, the driving wheel has teeth evenly distributed around its periphery, with tooth grooves formed between adjacent teeth. A pawl is formed on the end of the transmission arm that abuts the driving wheel, and the pawl abuts against the inner wall of the tooth groove. When the drive unit drives the transmission arm in reciprocating motion, the pawl alternately pushes and disengages within the tooth groove, allowing the driving wheel to continuously rotate in one direction. Each reciprocating motion pushes the driving gear twice, doubling the transmission efficiency.

[0007] Furthermore, the two transmission arms are divided into a long arm and a short arm. The short arm abuts against the side of the driving wheel closest to the drive unit, while the long arm abuts against the side of the driving wheel away from the drive unit. The pawl of the short arm and the pawl of the long arm are arranged opposite each other. This allows the pawls of the short and long arms to work together better. When the drive unit drives the transmission arm to move in one direction (linearly or rotationally), the pawl of the short arm pushes the driving gear to rotate within the tooth groove, while the pawl of the long arm prepares for the next push. When the drive unit drives the transmission arm to move linearly in the opposite direction, the pawl of the long arm pushes the driving wheel to rotate, while the pawl of the short arm prepares for the next push. This further improves the stability of the driving wheel's rotation and transmission efficiency, ensuring that each reciprocating motion can more effectively drive the driving wheel to rotate, achieving a more efficient transmission effect under the action of limited driving force, and reducing unnecessary energy loss during the transmission process.

[0008] Furthermore, a rotating shaft is provided in the middle of the transmission arm, and the transmission arm, connected to the drive unit, can rotate relative to the drive unit around the rotating shaft. The provision of the rotating shaft can solve the problems of insufficient driving force or insufficient driving stroke, and poor stability. When the drive unit drives the transmission arm to move, the rotating shaft can provide a stable support point for the transmission arm, effectively dispersing the torque generated during the transmission process, and preventing the transmission arm from shaking or deformation due to uneven force.

[0009] Furthermore, the transmission arm includes a vertically arranged base plate and side plates. The base plate is provided with a mounting hole for accommodating the rotating shaft, and a pawl is formed at the end of the side plate. This placement of the pawl at the end of the side plate allows for a better angle and space for applying force when engaging the tooth grooves of the driving gear, facilitating smoother rotation of the driving gear. Furthermore, the vertical arrangement of the base plate and side plates enhances the overall strength of the transmission arm, maintaining a stable structural form even under high torque and pressure, further improving the reliability and durability of the entire reciprocating drive structure.

[0010] Furthermore, an elastic bracket is provided at the end of the transmission arm, and the pawl is movably disposed within the elastic bracket, so that the pawl is subjected to the thrust applied by the elastic bracket into the tooth groove. The provision of the elastic bracket ensures that the pawl is always in close contact with the tooth groove of the driving gear. Even if there is a slight vibration or displacement during the transmission process, the pawl can quickly return to a state of engagement with the tooth groove due to the thrust of the elastic bracket, avoiding slipping or disengagement. In addition, the elastic bracket can also provide a certain buffering effect for the pawl. When the pawl collides with the tooth groove, the elastic bracket can absorb some of the impact force, reducing wear on the pawl and tooth groove, and extending the service life of the pawl and driving gear.

[0011] Furthermore, the elastic bracket includes a spring and a slider. The slider is elastically constrained within the elastic bracket by the spring, and the pawl is fixed to the side of the slider closest to the driving gear. This combination of spring and slider makes the elastic action of the elastic bracket more flexible and stable. The spring can elastically expand and contract according to the different forces acting on the pawl, thereby adaptively adjusting the position of the slider, allowing the pawl to better adapt to the position changes of the driving gear tooth groove.

[0012] Furthermore, the pawl is a shift pin, and the slider is U-shaped. The shift pin is fixed to the open end of the U-shaped slider. The elastic bracket has a sliding groove inside, through which the slider moves, and a stopper is installed at the end of the groove. When the slider moves within the groove under the action of the spring, the stopper limits the maximum displacement of the slider, preventing it from falling out of the groove, thus ensuring the structural stability of the elastic bracket. At the same time, when the shift pin cooperates with the tooth groove of the driving gear, it can more accurately engage and disengage the tooth groove, improving transmission reliability.

[0013] A drug infusion device with a reciprocating drive structure includes a housing, a fluid sac, and a push rod. The fluid sac is disposed within the housing. One end of the push rod is movably disposed within the fluid sac and connected to a piston. The other end of the push rod is provided with an infusion gear, which is in transmission connection with the drive structure via a gear assembly. The drive structure transmits power to the infusion gear via the gear assembly. The rotation of the infusion gear drives the push rod within the fluid sac, which in turn drives the piston within the fluid sac, forcing the drug liquid out of the sac for infusion. This achieves precise and stable infusion of the drug liquid, meeting the patient's needs for timed and quantitative drug infusion.

[0014] Furthermore, the gear assembly includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear. The first gear is coaxial with the driving gear, the second gear is meshed with the first gear, the third gear is coaxial with the second gear, the third gear, the fourth gear and the fifth gear are meshed with each other, and the fifth gear is meshed with the infusion gear, so that the power can achieve multi-stage speed change and stable transmission during the transmission process. The first gear is coaxial with the driving gear, and the power of the driving structure is directly introduced into the gear assembly. The meshing of the second gear with the first gear realizes the initial transmission and speed change of power. The third gear is coaxial with the second gear to ensure the continuity of power transmission. The third gear, the fourth gear and the fifth gear are meshed with each other, further adjusting the transmission ratio and optimizing the power transmission path, so that the power can be transmitted to the fifth gear more efficiently. Finally, the fifth gear is meshed with the infusion gear, accurately transmitting the power to the infusion gear, thereby driving the push rod to perform reciprocating motion in the liquid sac, ensuring that the liquid can be squeezed out of the liquid sac for infusion according to the preset rhythm and dosage.

[0015] The beneficial effects of the present invention are: The present invention provides a reciprocating drive structure, which drives two transmission arms that are against the driving wheel to perform reciprocating motion through a driving part. Each time the two transmission arms reciprocate, they work on the driving wheel and can drive the driving wheel to rotate twice. Under the condition of limited electric energy, the transmission efficiency is doubled, which greatly reduces the power consumption and effectively extends the life of the instrument. At the same time, this reciprocating drive method makes the gears more evenly stressed during the movement, avoids wear and jitter caused by local uneven stress, greatly improves the stability of the structure, and thus ensures the accuracy of drug liquid infusion, providing patients with more reliable treatment protection. In addition, the reciprocating drive structure is flat and will not increase the volume and weight of the infusion device, which fully meets the design requirements of a miniaturized drug liquid infusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts. Figure 1 This is a first-perspective schematic diagram of a form of embodiment 1; Figure 2 This is a second perspective schematic diagram of a form of embodiment 1; Figure 3 yes Figure 1 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 4 yes Figure 2 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 5 Is a Figure 3 Schematic diagram of a drug solution infusion device with a structure; Figure 6 This is a first-view schematic diagram of another form of embodiment 1; Figure 7 is a second viewing angle schematic diagram of another form of embodiment 1; Figure 8 yes Figure 6 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 9 yes Figure 7 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 10 Is a Figure 8 Schematic diagram of a drug solution infusion device with a structure; Figure 11 is a first-view schematic diagram of Example 2; Figure 12 is a schematic diagram of a second viewing angle of embodiment 2; Figure 13 yes Figure 11 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 14 yes Figure 12 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 15 Is a Figure 13 Schematic diagram of a drug solution infusion device with a structure; Figure 16 is a first-view schematic diagram of Example 3; Figure 17 is a schematic diagram of a second viewing angle of embodiment three; Figure 18 yes Figure 16 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 19 yes Figure 17 Schematic diagram of the coordination between the viewing angle and the gear assembly; Figure 20 Is a Figure 18 Schematic diagram of a drug solution infusion device with a structure; Figure 21 This is a first-angle schematic diagram of a driving part that is a piezoelectric ceramic; Figure 22 is a second angle schematic diagram showing that the driving part is a piezoelectric ceramic; Figure 23 1. A schematic diagram of a first angle of view showing a driving portion made of shape memory alloy; Figure 24is a second angle schematic diagram of the driving part being a shape memory alloy; In the figure, 1. driving unit, 2. transmission arm, 21. pawl, 22. rotating shaft, 3. gear assembly, 31. first gear, 32. second gear, 33. third gear, 34. fourth gear, 35. fifth gear, 36. driving gear, 4. elastic bracket, 41. spring, 42. slider, 43. slide groove, 44. stopper, 45. needle, 5. housing, 6. liquid capsule, 7. push rod, 71. infusion gear. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In order to ensure that the drug infusion device meets the requirements of miniaturization design and to improve the gear drive efficiency as much as possible, a reciprocating drive structure is designed. Figure 1-4 As shown, the reciprocating drive structure is used to drive the gear assembly 3 to rotate. The gear assembly 3 includes a driving wheel 36 and at least one driven wheel. The drive structure includes a driving part 1 and at least two transmission arms 2. One end of the two transmission arms 2 is connected to the driving part 1 and can perform linear reciprocating motion through the driving part 1. The other end of the two transmission arms 2 is against the driving gear 36, which is used to convert the linear reciprocating motion of the transmission arm 2 into the rotational motion of the driving wheel 36.

[0019] When operating, the drive unit 1 generates linear reciprocating power, driving the transmission arms 2 on both sides to perform linear reciprocating motion. When the two transmission arms 2 move in the same direction at the same time, the transmission arm 2 on one side will contact the driving wheel 36 and push the driving wheel 36 to rotate. When the two transmission arms 2 move in the opposite direction, the transmission arm 2 on the other side will contact the driving wheel 36 and push the driving wheel 36 to rotate. This cycle realizes continuous unidirectional rotation of the driving wheel 36. Each time the two transmission arms 2 reciprocate, they both perform work and drive the driving wheel 36 twice. This design doubles the gear drive efficiency through reciprocating motion under the premise of limited power and limited space, providing strong support for the miniaturization of the drug infusion device.

[0020] The drive unit 1 is typically a reciprocating motor. The operating principle of a reciprocating motor is primarily based on a combination of electromagnetic induction and mechanical transmission. This type of motor typically consists of a stator, a coil, a rocker, and a magnet. When the coil is energized, a magnetic field is generated. The magnetic field interacts with the magnet, driving the rocker to reciprocate. When the rocker reaches a certain position, the magnetic field changes direction, causing the rocker to reverse direction, thereby achieving reciprocating motion. Of course, reciprocating motion can also be achieved using gears and eccentric mechanisms. The motor's rotational motion, combined with gear transmission and an eccentric mechanism, converts rotational motion into reciprocating motion. The motor drives an eccentric, which in turn drives the rocker or output shaft to reciprocate via a connecting rod. Alternatively, the motor converts rotational motion into linear reciprocating motion via a slider-crank mechanism. The crank is fixed to the motor's output shaft, and the crank's eccentric position is connected to a slider, which reciprocates on a guide rail. Any mechanism capable of driving the two transmission arms 2 to perform linear reciprocating motion will suffice. In actual applications, a suitable driving mode can be selected according to the specific needs and design characteristics of the drug infusion device. If there are certain requirements for the control accuracy of the motor and high requirements for the driving efficiency, using a reciprocating swing motor to achieve reciprocating motion may be a better choice. Without increasing additional power consumption, each reciprocating motion can perform work on the driving wheel 36 twice, which can double the driving efficiency.

[0021] In one embodiment of the first embodiment, to enhance drive stability, teeth are evenly distributed around the periphery of the driving wheel 36, with tooth grooves formed between adjacent teeth. A pawl 21 is formed on the end of the transmission arm 2 that abuts the driving wheel 36, and the pawl 21 abuts against the inner wall of the tooth groove. When the drive unit 1 drives the transmission arm 2 in linear reciprocating motion, the pawls 21 of the two transmission arms 2 alternately push and disengage within the tooth groove, allowing the driving wheel 36 to continuously rotate unidirectionally. Each reciprocating motion pushes the driving wheel 36 twice, doubling the transmission efficiency.

[0022] Another form of embodiment 1, such as Figure 6-9 As shown, in order to further improve the driving stability, the two transmission arms 2 and the driving wheel 36 act in pushing and hooking modes respectively. The ratchets 21 of the two transmission arms 2 are respectively against one side of the driving wheel, and the ratchets are arranged relative to each other. When the driving part 1 drives the transmission arm 2 to perform linear reciprocating motion, the ratchets 21 of the two transmission arms 2 will push and pull alternately in the tooth groove to disengage, so that the rotation of the driving wheel 36 is more stable and continuous. This design can effectively prevent the driving wheel 36 from slipping or shaking during rotation, further improving the reliability and stability of the entire driving structure, while also maintaining a high level of transmission efficiency, ensuring that the drug infusion device can operate stably and efficiently.

[0023] Specifically, the two transmission arms 2 are divided into a long arm and a short arm. The short arm abuts against the side of the driving wheel 36 closer to the driving unit 1, while the long arm abuts against the side of the driving wheel 36 farther away from the driving unit 1. The pawl 21 of the short arm and the pawl 21 of the long arm are arranged opposite each other. When the driving unit 1 drives the transmission arms 2 to perform linear reciprocating motion, the pawl 21 of the short arm and the pawl 21 of the long arm alternately act on different positions of the driving wheel 36.

[0024] Example 2, as Figure 11-14 As shown, to increase the driving force exerted by the transmission arm 2 on the driving wheel 36 or to compensate for the insufficient travel of the drive structure, a rotating shaft 22 is provided in the middle of the transmission arm 2. The transmission arm 2, connected to the drive unit 1, can rotate relative to the drive unit 1 about the rotating shaft 22. The provision of the rotating shaft 22 can address the problems of insufficient driving force or insufficient travel, as well as the poor stability caused by the long transmission arm 2. When the drive unit 1 drives the transmission arm 2 to move, the rotating shaft 22 provides a stable support point for the transmission arm 2, effectively dissipating the torque generated during the transmission process and preventing the transmission arm 2 from shaking or deforming due to uneven force. This allows the transmission arm 2 to more stably transmit the driving force to the driving wheel 36. Furthermore, the manner in which the transmission arm 2 rotates relative to the drive unit 1 about the rotating shaft 22 can be flexibly adjusted according to the rotation of the driving wheel 36, ensuring that the pawls 21 of the short and long arms always maintain good contact and force with the teeth of the driving gear 36, further improving the stability of the rotation of the driving wheel 36 and the transmission efficiency. In the actual operation of the drug infusion device, this improved transmission structure can ensure that the drug infusion process is smoother and more accurate, reduce the infusion error caused by unstable transmission, and provide patients with more reliable treatment protection.

[0025] Preferably, the transmission arm 2 includes a vertically arranged base plate and side plates. The base plate is provided with a mounting hole for accommodating the rotating shaft 22, and the pawl 21 is formed at the end of the side plate. The side plate of the long arm is provided with an avoidance groove that does not hinder the rotation of the driving wheel 36. Forming the pawl 21 at the end of the side plate enables the pawl 21 to obtain a better force application angle and space when cooperating with the tooth groove of the driving wheel 36, which facilitates the pawl 21 to more smoothly push the driving wheel 36 to rotate. At the same time, the vertically arranged base plate and side plates can enhance the overall strength of the transmission arm 2, allowing it to maintain a stable structural form even when subjected to large torque and pressure, further improving the reliability and durability of the entire reciprocating drive structure.

[0026] Example 3, as Figure 16-20As shown, to further ensure good contact and force between the pawl 21 and the tooth groove, the structure of the pawl 21 is deformed, so that the pawl 21 is composed of an elastic bracket 4 and a pin 45. The elastic bracket 4 is provided at the end of the transmission arm 2, and the pin 45 is elastically constrained within the elastic bracket 4, so that the pin 45 is subjected to the thrust applied by the elastic bracket 4 into the tooth groove. No matter what slight vibration or deviation is encountered during the transmission process, the elastic bracket 4 can promptly adjust the position and angle of the pin 45, so that it always fits tightly with the tooth groove. Moreover, the elastic force of the spring 41 can also, to a certain extent, cushion the impact force generated when the pin 45 contacts the tooth groove of the driving wheel 36, reducing wear between the two and extending the service life of the pin 45 and the driving wheel 36. In addition, this elastic design also makes the entire transmission process smoother, reduces noise and jamming, and further improves the stability and reliability of the drug infusion device.

[0027] Specifically, the elastic bracket 4 includes a spring 41 and a slider 42. The slider 42 is elastically constrained within the elastic bracket 4 by the spring 41. A setting pin 45 is fixedly mounted on the side of the slider 42 near the driving gear 36. The slider 42 is U-shaped, and the setting pin 45 is fixedly mounted at the open end of the U-shaped slider 42. The elastic bracket 4 has a slot 43 inside it for the slider 42 to move, and a stopper 44 is provided at the end of the slot 43.

[0028] When the transmission arm 2 moves, the slider 42 is able to move flexibly within the slot 43 under the action of the spring 41. The elastic deformation of the spring 41 provides the slider 42 with the power and cushioning to move forward and backward. When the setting pin 45 contacts the tooth tip of the driving gear 36, it encounters significant resistance. Under the action of this resistance, the slider 42 compresses the spring 41, allowing the setting pin 45 to retreat within a certain range, avoiding damage due to rigid collision. When the setting pin 45 contacts the tooth groove of the driving gear 36, the resistance decreases, and the elastic restoring force of the spring 41 pushes the slider 42 forward, making the setting pin 45 tightly pressed into the tooth groove. The provision of the stopper 44 limits the maximum movement distance of the slider 42, preventing it from escaping from the slot 43, ensuring the stability of the overall structure of the elastic bracket 4, and thus ensuring a stable and reliable transmission effect between the setting pin 45 and the driving gear 36.

[0029] like Figure 5 、 10 As shown in Figures 15 and 20, a drug liquid infusion device with the above-mentioned reciprocating gear drive structure includes a shell 5, a liquid capsule 6 and a push rod 7. The liquid capsule 6 is arranged in the shell 5, one end of the push rod 7 is movably arranged in the liquid capsule 6, and the other end of the push rod 7 is provided with an infusion gear 71, which is connected to the drive structure through the gear assembly 3.

[0030] When the drive mechanism is in operation, the gear assembly 3 drives the infusion gear 71 to rotate, thereby causing the push rod 7 to push the liquid sac 6. This push of the push rod 7 squeezes and releases the liquid medicine in the sac 6, achieving precise infusion of the liquid medicine. The housing 5 protects the internal structure, preventing external factors from damaging the sac 6, push rod 7, and gear assembly 3, thereby ensuring the overall stability and reliability of the liquid medicine infusion device. During the infusion process, by rationally designing parameters such as the transmission ratio of the gear assembly 3, the movement speed and displacement of the push rod 7 can be precisely controlled, thereby achieving precise adjustment of the liquid medicine infusion dose and infusion rate to meet the treatment needs of different patients.

[0031] Specifically, the gear assembly 3 includes a first gear 31, a second gear 32, a third gear 33, a fourth gear 34 and a fifth gear 35. The first gear 31 is coaxial with the driving wheel 36, the second gear 32 is meshed with the first gear 31, the third gear 33 is coaxial with the second gear 32, the third gear 33, the fourth gear 34 and the fifth gear 35 are meshed with each other, and the fifth gear 35 is meshed with the infusion gear 71.

[0032] The above-mentioned gear assembly 3 enables multi-stage speed change and stable transmission during the power transmission process. The first gear 31 is coaxial with the driving wheel 36, and the power of the driving structure is directly introduced into the gear assembly 3. The engagement of the second gear 32 with the first gear 31 realizes the initial transmission and speed change of power. The third gear 33 is coaxial with the second gear 32 to ensure the continuity of power transmission. The third gear 33, the fourth gear 34 and the fifth gear 35 are engaged with each other to further adjust the transmission ratio and optimize the power transmission path, so that the power can be more efficiently transmitted to the fifth gear 35. Finally, the fifth gear 35 is engaged with the infusion gear 71, and the power is accurately transmitted to the infusion gear 71, thereby driving the push rod 7 to perform a push injection action in the liquid capsule 6, ensuring that the liquid medicine can be squeezed out of the liquid capsule 6 for infusion according to the preset rhythm and dosage.

[0033] The driving part 1 of each embodiment above is driven by electromagnetic drive as an example, but it can also be driven by electromagnetic drive. Figure 21 、 22 The piezoelectric ceramic drive shown or Figure 23 、 24The shape memory alloy drive shown only needs to drive the transmission arm 2 to perform reciprocating motion. Electromagnetic drive has the characteristics of fast response speed, large driving force and stability. In electromagnetic drive, the transmission arm 2 can be accurately driven to perform reciprocating movements by controlling the on and off and size of the current. The magnetic field generated by the current interacts with the permanent magnet to provide the required power for the transmission arm 2. The current parameters can be flexibly adjusted according to the actual drug infusion needs, thereby accurately controlling the movement speed and stroke of the transmission arm 2 to achieve fine adjustment of the drug infusion rhythm and dosage. At the same time, the structure of the electromagnetic drive is relatively simple, easy to install and maintain, and can effectively reduce the cost and failure rate of the entire drug infusion device; piezoelectric ceramic drive has the characteristics of fast response speed and high precision, and can achieve more precise control of the transmission arm 2. The pushing action of the push rod 7 can be accurately adjusted, making the rhythm and dosage control of the drug infusion more precise; and shape memory alloy drive has the advantages of strong deformation ability and large driving force. In drug infusion scenarios requiring a large pushing force, it can show good performance, ensuring that under various complex infusion conditions, the drug can be stably squeezed out of the liquid bag 6 for infusion. According to the actual application needs and the specific requirements of drug infusion, the appropriate driving mode can be flexibly selected to achieve the best infusion effect.

[0034] The above description is only illustrative of the present invention and not restrictive. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A reciprocating drive structure for driving a gear assembly (3) to rotate, the gear assembly (3) comprising a driving wheel (36) and at least one driven wheel, characterized in that: The driving structure includes a driving part (1) and at least two transmission arms (2). One end of the two transmission arms (2) is connected to the driving part (1) and can be driven by the driving part (1) to make a reciprocating motion. The other ends of the two transmission arms (2) abut against the driving wheel (36) and are used to convert the reciprocating motion of the transmission arms (2) into the rotational motion of the driving wheel (36).

2. A reciprocating drive structure according to claim 1, characterized in that: The periphery of the driving wheel (36) is evenly distributed with teeth, and a tooth groove is formed between adjacent teeth. One end of the transmission arm (2) that abuts against the driving wheel (36) is formed with a pawl (21), and the pawl (21) abuts against the inner wall of the tooth groove.

3. A reciprocating drive structure according to claim 2, characterized in that: The two transmission arms (2) are divided into a long arm and a short arm. The short arm abuts against one side of the driving wheel (36) close to the driving part (1), and the long arm abuts against one side of the driving wheel (36) far from the driving part (1). The pawls (21) of the short arm and the pawls (21) of the long arm are arranged oppositely.

4. The reciprocating gear drive structure according to claim 3, characterized in that: A rotating shaft (22) is provided in the middle of the transmission arm (2). The transmission arm (2) connected to the driving part (1) can rotate relative to the driving part (1) around the rotating shaft (22).

5. The reciprocating drive structure according to claim 4, characterized in that: The transmission arm (2) includes a bottom plate and a side plate arranged vertically. An installation hole for accommodating the rotating shaft (22) is opened on the bottom plate, and the pawl (21) is formed at the end of the side plate.

6. The reciprocating drive structure according to claim 4, characterized in that: An elastic bracket (4) is provided at the end of the transmission arm (2). The pawl (21) is movably arranged in the elastic bracket (4), so that the pawl (21) receives a thrust force applied by the elastic bracket (4) to press into the tooth groove.

7. The reciprocating gear drive structure according to claim 6, characterized in that: The elastic bracket (4) includes a spring (41) and a slider (42). The slider (42) is movably arranged in the elastic bracket (4) through the spring (41). The pawl (21) is fixedly arranged on one side of the slider (42) close to the driving wheel (36).

8. The reciprocating gear drive structure according to claim 7, characterized in that: The pawl (21) adopts a dialing pin (45). The slider (42) is in a U shape. The dialing pin (45) is fixedly arranged at the open end of the U-shaped slider (42). A sliding groove (43) for the slider (42) to move is opened inside the elastic bracket (4), and a stop block (44) is arranged at the end of the sliding groove (43).

9. A drug solution infusion device having a reciprocating drive structure according to any one of claims 1 to 8, characterized in that: It includes a housing (5), a liquid sac (6) and a push rod (7). The liquid sac (6) is arranged inside the housing (5). One end of the push rod (7) is movably arranged inside the liquid sac (6), and an infusion gear (71) is arranged at the other end of the push rod (7). The infusion gear (71) is传动连接 with the driving structure through a gear assembly (3).

10. The drug liquid infusion device according to claim 9, characterized in that: The gear assembly (3) includes a first gear (31), a second gear (32), a third gear (33), a fourth gear (34) and a fifth gear (35). The first gear (31) is coaxial with the driving wheel (36). The second gear (32) meshes with the first gear (31). The third gear (33) is coaxial with the second gear (32). The third gear (33), the fourth gear (34) and the fifth gear (35) mesh with each other. The fifth gear (35) meshes with the infusion gear (71).

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