Drug delivery device based on automatic piston mechanism and its application method

Abstract

The present invention discloses a drug delivery device based on an automatic piston mechanism and an application method thereof, comprising: a drug liquid container for storing drug liquid; an automatic piston assembly connected to the drug liquid container, and the automatic piston assembly is provided with a piston starting end; a liquid delivery extension tube body connected to the automatic piston assembly; a flow rate monitoring sensor arranged on the liquid delivery extension tube body; a micro-motor push rod having a linear kinetic energy output end; a liquid flow deceleration structure, wherein a plurality of groups of liquid flow deceleration structures are respectively flippably arranged on the liquid passage of the liquid delivery extension tube body, and a plurality of groups of liquid flow deceleration structures are respectively connected to the linear kinetic energy output end of the micro-motor push rod in a transmission manner, and a plurality of groups of liquid flow deceleration structures convert linear kinetic energy into rotational kinetic energy. The invention solves the problems in the prior art that when drug delivery is continuously administered through a drug delivery device, the repeated pressing operation is cumbersome and inconvenient, and the spraying flow rate of the drug delivery liquid cannot be regulated, secondary damage to the lesion site is easily caused, and the functionality is relatively single.

Description

Technical Field

[0001] The present invention relates to the technical field of medical drug delivery equipment, and in particular to a drug delivery device based on an automatic piston mechanism and an application method thereof. Background Art

[0002] At present, medical drug delivery devices for body surface lesions are a method of delivering drugs to the lesion site, thereby producing local or systemic therapeutic effects. They are widely used in normal treatment processes. At the same time, in order to be easy to carry, the overall structure is small in size and has strong convenience.

[0003] In the prior art, when delivering the drug solution, some drug delivery devices need to squeeze the drug solution container, which may easily cause damage and deformation of the drug solution container; some drug delivery devices use a piston drug delivery mechanism, but when continuous drug delivery is required, the drug delivery can only be performed by repeated pressing, which is cumbersome and inconvenient to operate, and the spraying flow rate of the drug solution cannot be regulated. Special diseases are prone to secondary damage to the lesion site, and the functionality is relatively simple. Summary of the invention

[0004] To this end, the present invention provides a drug delivery device based on an automatic piston mechanism and an application method thereof, so as to solve the problems that when continuously delivering drugs through the existing drug delivery device, the repeated pressing operation is cumbersome and inconvenient, the spraying flow rate of the drug delivery liquid cannot be regulated, secondary damage to the lesion site is easily caused, and the functionality is relatively single.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A drug delivery device based on an automatic piston mechanism, comprising:

[0007] A liquid medicine container, used for storing liquid medicine;

[0008] An automatic piston assembly, wherein the liquid agent input end is connected to the liquid medicine container, and the automatic piston assembly is provided with a piston start end for starting the automatic piston;

[0009] A liquid feeding extension tube body is connected to the liquid output end of the automatic piston assembly;

[0010] A flow rate monitoring sensor is correspondingly arranged in the liquid passage of the liquid feeding extension tube body;

[0011] A micro motor push rod is connected to the flow rate monitoring sensor via a circuit, and the micro motor push rod has a straight line kinetic energy output end;

[0012] The liquid flow deceleration structure is provided with several groups, and the liquid flow deceleration structures of the several groups are respectively and flippably arranged at intervals corresponding to the liquid passages of the liquid feeding extension tube body, and the liquid flow deceleration structures of the several groups are respectively connected with the transmission assembly between the linear kinetic energy output ends of the micro motor push rod, and the liquid flow deceleration structures of the several groups can convert the received linear kinetic energy into rotational kinetic energy.

[0013] On the basis of the above technical solution, the present invention is further described as follows:

[0014] As a further embodiment of the present invention,

[0015] The liquid medicine container is provided with a liquid medicine suction tube;

[0016] The automatic piston assembly comprises an automatic piston body and a piston starter lever, and the automatic piston assembly is equipped with an electric control structure;

[0017] The automatic piston body is connected to the control output end of the electric control structure through a circuit; the input end of the automatic piston body is connected to the liquid suction tube, and the output end of the automatic piston body is connected to the liquid feeding extension tube;

[0018] The piston start push rod is assembled on the automatic piston body, and the piston start push rod is connected to the control input end of the electric control structure through a circuit.

[0019] As a further embodiment of the present invention,

[0020] The flow rate monitoring sensor is fixedly mounted on the outer wall of the liquid supply extension tube, and the monitoring probe of the flow rate monitoring sensor is fixed to the inner wall of the liquid path of the liquid supply extension tube through a sealed extension, and the flow rate monitoring sensor is connected to the control input end of the electric control structure through a circuit;

[0021] The micro-motor push rod is fixedly mounted on the outer wall of the liquid feeding extension tube, and the micro-motor push rod is connected to the control output end of the electric control structure through a circuit;

[0022] The drug delivery device further comprises:

[0023] A flow rate control structure is slidably disposed on the inner wall of the liquid path of the liquid feeding extension tube body, and the flow rate control structure is connected to the linear kinetic energy output end of the micro-motor push rod by a transmission assembly;

[0024] The liquid flow deceleration structure and the flow rate regulating structure are connected by a transmission assembly.

[0025] As a further embodiment of the present invention,

[0026] An annular assembly chamber is provided between the inner and outer walls of the liquid feeding extension tube body;

[0027] The micro motor push rod comprises a motor push rod body;

[0028] The base of the motor push rod body is fixedly mounted on the outer wall of the liquid feeding extension tube body, and the linear kinetic energy output end of the motor push rod body is transmission-fixedly mounted with a driving force rod, which passes through the outer wall of the liquid feeding extension tube body and extends to the assembly chamber of the liquid feeding extension tube body;

[0029] The flow rate regulating structure includes a shift ring seat;

[0030] The shift ring seat is configured as a channel-type ring seat, and the channel-type shift ring seat has a built-in sliding assembly arranged in the assembly chamber of the liquid feeding extension tube body, and the channel-type shift ring seat is transmission-fixedly connected to the driving force rod of the motor push rod body, and the linear kinetic energy transmitted by the driving force rod can drive the shift ring seat to synchronously shift along the annular assembly chamber.

[0031] As a further embodiment of the present invention,

[0032] The flow rate control structure also includes an adaptive spring support, a transmission extension rod and a positioning drive rack;

[0033] The adaptive spring supports are uniformly arranged in a plurality of groups along the circumference of the displacement ring seat, and the plurality of groups of adaptive spring supports are respectively slidably assembled in the assembly chamber of the liquid feeding extension tube body, and one end of the plurality of groups of adaptive spring supports are all transmission-fixedly connected to the displacement ring seat;

[0034] Each group of the adaptive spring supports is equipped with a buffer spring;

[0035] The transmission extension rods and the positioning drive racks are arranged in a plurality of groups corresponding to the inside of the annular assembly chamber, and one end of the plurality of transmission extension rods along the extension direction thereof is connected to the other end of the plurality of adaptive spring brackets in a one-to-one transmission and fixed connection; the plurality of positioning drive racks are respectively located at the outer side of the other end of the plurality of transmission extension rods in a one-to-one correspondence, and the plurality of positioning drive racks are fixedly arranged on the inner wall of the assembly chamber;

[0036] The liquid flow deceleration structure is provided in a plurality of groups, and each group of the liquid flow deceleration structure comprises an indexing deceleration rod body and an indexing driving gear;

[0037] One end shaft portion of the indexing reduction rod body is coaxially fixedly connected to the indexing driving gear, and one end shaft portion of the indexing reduction rod body is connected to the other end portion of the transmission extension rod along its extension direction by transfer assembly;

[0038] The indexing drive gear and the positioning drive rack are meshed and assembled.

[0039] As a further embodiment of the present invention,

[0040] The micro motor push rod also includes a first sealing rubber pad;

[0041] The first plugging rubber pad is configured as a first soft silicone member, and the first plugging rubber pad is positioned to a position where the driving force rod passes through the outer wall of the liquid feeding extension tube body through its elastic action;

[0042] The first sealing rubber pad is fitted on the outer side of the driving force rod, and is used to adaptively adapt to the transmission position of the driving force rod to maintain sealing based on its own flexible stretchability and compression when the motor push rod body outputs linear kinetic energy through the driving force rod.

[0043] As a further embodiment of the present invention,

[0044] The liquid flow deceleration structure also includes a third sealing rubber pad;

[0045] The third sealing rubber pad is configured as a third soft silicone member, and the third sealing rubber pad is positioned to a position corresponding to the inner wall of the transfer deceleration rod body passing through the liquid feeding extension tube body 3 through its elastic action;

[0046] The third sealing rubber pad is fitted on the outer side of the indexing deceleration rod body, and is used for adapting the transmission position of the indexing deceleration rod body to maintain sealing based on its own flexible stretching and compression when the indexing deceleration rod body is flipped.

[0047] As a further embodiment of the present invention,

[0048] The driving force required by the transmission extension rod to drive the indexing drive gear to rotate and advance on the positioning drive rack is smaller than the driving force required for compressing the buffer spring.

[0049] As a further embodiment of the present invention,

[0050] The transfer deceleration rod body is configured as a strip plate structure;

[0051] The side edges of the indexing reduction rod body of the strip plate body are all arranged with rounded corners, and the end of the indexing reduction rod body of the strip plate body away from the indexing driving gear is arranged with a rounded tip.

[0052] A method for using the drug delivery device based on the automatic piston mechanism comprises the following steps:

[0053] The piston start lever in the automatic piston assembly is pressed, and the electric control structure receives the start signal and issues a control command to start the automatic piston body in the automatic piston assembly. The automatic piston body repeatedly works to form a pressure difference corresponding to the liquid container, and the liquid in the liquid container is extracted by the pressure difference and transferred to the liquid delivery extension tube for continuous drug delivery;

[0054] The flow rate of the liquid agent continuously flowing through the liquid feeding extension tube body is monitored in real time by a flow rate monitoring sensor, and the monitored flow rate data signal can be sent to the electronic control structure in real time. The electronic control structure calculates the driving value based on the received flow rate data signal and its preset deceleration ratio relationship and issues a control instruction. The micro-motor push rod outputs linear kinetic energy of a specific driving value through its driving force rod based on the control instruction.

[0055] The linear kinetic energy transmitted by the driving force rod effectively drives the shift ring seat in the flow rate control structure to synchronously shift along the built-in annular assembly chamber of the liquid feeding extension tube body, and the shift ring seat drives several groups of adaptive spring brackets and the transmission extension rod in the flow rate control structure to synchronously shift along the annular assembly chamber, and the linear kinetic energy transmitted by the transmission extension rod synchronously drives the indexing drive gear in the liquid flow deceleration structure to rotate based on the positioning drive rack, and then the indexing drive gear synchronously drives the indexing deceleration rod body in the liquid flow deceleration structure, so that the indexing deceleration rod body flips a specific angle according to the monitored flow rate and the preset ratio calculation result to adaptively decelerate the liquid agent flowing through it;

[0056] When several indexing deceleration rods decelerate the liquid, they are subjected to the impact pressure and the viscosity of the liquid. At this time, several indexing deceleration rods successively overcome the driving force of the indexing drive gear and the compression driving force further transmitted to the buffer spring to produce a certain amount of return flipping to avoid excessive blocking of the liquid.

[0057] The present invention has the following beneficial effects:

[0058] The device can effectively realize a single-press start by cooperating with the medicine liquid container, the automatic piston assembly and the liquid feeding extension tube body, so that the automatic piston assembly can work repeatedly to form a pressure difference corresponding to the medicine liquid container, thereby realizing continuous drug delivery. At the same time, the flow rate monitoring sensor can be used to monitor the flow rate of the liquid continuously flowing through the liquid feeding extension tube body in real time, and the electronic control structure and the micro-motor push rod can be used to further drive the flow rate control structure and the liquid flow deceleration structure. The liquid flow deceleration structure can be used to achieve adaptive deceleration based on the initial speed of the liquid flowing through the liquid feeding extension tube body, thereby effectively improving the overall functional safety and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for the implementation mode or the description of the prior art will be briefly introduced below. The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0060] Figure 1 A schematic diagram of the overall structure of a drug delivery device based on an automatic piston mechanism provided in an embodiment of the present invention.

[0061] Figure 2 The drug delivery device based on the automatic piston mechanism provided in the embodiment of the present invention is Figure 1 A magnified view of the local structure at point A.

[0062] Figure 3 A schematic diagram of the assembly structure of a flow rate regulating structure and a liquid flow deceleration structure in a drug delivery device based on an automatic piston mechanism provided in an embodiment of the present invention.

[0063] Figure 4 The drug delivery device based on the automatic piston mechanism provided in the embodiment of the present invention is Figure 3 A magnified view of the local structure at point B in the middle.

[0064] Figure 5 A schematic diagram of the structure of a transfer deceleration rod body of a liquid flow deceleration structure in a drug delivery device based on an automatic piston mechanism provided in an embodiment of the present invention.

[0065] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0066] Liquid medicine container 1;

[0067] Automatic piston assembly 2: automatic piston body 21, piston start lever 22;

[0068] Liquid feeding extension tube body 3, assembly chamber 31;

[0069] Flow rate monitoring sensor 4;

[0070] Micro motor push rod 5: motor push rod body 51, first blocking rubber pad 52;

[0071] Flow rate control structure 6: shift ring seat 61, second plugging rubber pad 611, adaptive spring support 62, buffer spring 63, transmission extension rod 64, positioning drive rack 65;

[0072] The liquid flow deceleration structure 7 includes a deceleration rod body 71 , a deceleration driving gear 72 , and a third sealing rubber pad 73 . DETAILED DESCRIPTION

[0073] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are 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.

[0074] The terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for the convenience of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the invention without substantially changing the technical content.

[0075] like Figures 1 to 3 As shown, an embodiment of the present invention provides a drug delivery device based on an automatic piston mechanism, including a drug liquid container 1, an automatic piston assembly 2, a liquid delivery extension tube 3, a flow rate monitoring sensor 4, a micro-motor push rod 5, a flow rate control structure 6 and a liquid flow deceleration structure 7, which is used to effectively realize a single press start through the cooperation of the drug liquid container 1, the automatic piston assembly 2 and the liquid delivery extension tube 3, so that the automatic piston assembly 2 can repeatedly work to form a pressure difference corresponding to the drug liquid container 1, thereby realizing continuous drug delivery, and at the same time, the flow rate monitoring sensor 4 can be used to monitor the flow rate of the liquid continuously flowing through the liquid delivery extension tube 3 in real time, and cooperate with the electric control structure and the micro-motor push rod 5 to further drive the flow rate control structure 6 and the liquid flow deceleration structure 7, thereby realizing adaptive deceleration based on the initial speed of the liquid flowing through the liquid delivery extension tube 3 with the help of the liquid flow deceleration structure 7, effectively improving the overall functional safety and practicality. The specific settings are as follows:

[0076] Please refer to Figure 1 The medicine liquid container 1 and the automatic piston assembly 2 are detachably fixedly assembled and connected, and the medicine liquid container 1 is equipped with a medicine liquid suction tube, which is connected to the input end of the automatic piston assembly 2 to complete the predetermined medicine liquid suction process.

[0077] The automatic piston assembly 2 includes an automatic piston body 21 and a piston starter lever 22, and the automatic piston assembly 2 is equipped with an electric control structure; wherein the automatic piston body 21 may be selected as but not limited to an electric piston mechanism of model WOB-L, and the electric automatic piston body 21 is connected to the control output end of the electric control structure through a circuit; the input end of the automatic piston body 21 is connected to the medicine liquid suction tube, and the output end of the automatic piston body 21 is connected to the liquid feeding extension tube 3; the piston starter lever 22 is assembled and arranged on the automatic piston body 21, and the piston starter lever 22 is connected to the control input end of the electric control structure through a circuit, so that the piston starter lever 22 is used as the receiving start end of the electric control structure, and the electric control structure can issue a control instruction to further control the automatic piston body 21 to work repeatedly to form a pressure difference corresponding to the medicine liquid container 1, thereby realizing continuous drug delivery based on the liquid feeding extension tube 3.

[0078] Specifically, the electric control structure includes a mobile power supply and a control module connected by a circuit. The mobile power supply can be but is not limited to a lithium battery. The control module can be selected from but is not limited to a single-chip control board of model AT80C51 and a microcontroller of model STM32; the control output end of the control module is connected to the input end of a relay through a circuit, and the output end of the relay is connected to the electric automatic piston body 21 through a circuit; the piston start lever 22 is connected to the control input end of the control module through a circuit, so as to realize the continuous automatic delivery control function of the liquid medicine.

[0079] Please refer to Figure 2 The flow rate monitoring sensor 4 is fixedly mounted on the outer wall of the liquid feeding extension tube body 3, and the monitoring probe of the flow rate monitoring sensor 4 is fixed to the inner wall of the liquid path of the liquid feeding extension tube body 3 through a sealed extension. The flow rate monitoring sensor 4 is connected to the control input end of the control module through a circuit, so as to monitor the flow rate of the liquid continuously flowing through the liquid feeding extension tube body 3 in real time through the flow rate monitoring sensor 4, and the monitored flow rate data signal can be sent to the electronic control structure in real time.

[0080] The micromotor push rod 5 is fixedly assembled on the outer wall of the liquid feeding extension tube body 3, and the micromotor push rod 5 is connected to the control output end of the control module through a circuit; the flow rate control structure 6 is correspondingly slidably arranged on the inner wall of the liquid path of the liquid feeding extension tube body 3, and the flow rate control structure 6 is transmission-assembled and connected to the kinetic energy output end of the micromotor push rod 5; the above-mentioned arrangement is used to realize that the electronic control structure issues a control instruction based on the received flow rate data signal and the preset deceleration ratio value, so that the micromotor push rod 5 outputs linear kinetic energy according to the value, and thereby further drives the flow rate control structure 6 and the liquid flow deceleration structure 7 with the help of the micromotor push rod 5 to achieve adaptive deceleration.

[0081] Specifically, please refer to Figures 3 to 5 , an annular assembly chamber 31 is provided between the inner and outer walls of the liquid feeding extension tube body 3; the micro motor push rod 5 includes a motor push rod body 51 and a first blocking rubber pad 52; wherein, the base portion of the motor push rod body 51 is fixedly assembled on the outer wall of the liquid feeding extension tube body 3, and the kinetic energy output end portion of the motor push rod body 51 is transmission-fixedly provided with a driving force rod, and the driving force rod passes through the outer wall of the liquid feeding extension tube body 3 and extends to the assembly chamber 31 of the liquid feeding extension tube body 3; the first blocking rubber pad 52 is set as a first soft silicone member, and the first blocking rubber pad 52 is elastically positioned to the passing position of the driving force rod corresponding to the outer wall of the liquid feeding extension tube body 3, and the first blocking rubber pad 52 is fitted on the outer side of the driving force rod, so that when the motor push rod body 51 outputs linear kinetic energy through the driving force rod, the first blocking rubber pad 52 can effectively adapt to the transmission position of the driving force rod based on its own flexible stretchable and compressible action to maintain sealing.

[0082] Please continue to refer to Figures 3 to 5 The flow rate regulating structure 6 includes a shift ring seat 61, an adaptive spring support 62, a buffer spring 63, a transmission extension rod 64 and a positioning drive rack 65; wherein, the shift ring seat 61 is configured as a channel-type ring seat, and the channel-type shift ring seat 61 is built-inly slidably assembled in the assembly chamber 31 of the liquid feeding extension tube body 3, and the channel-type shift ring seat 61 is transmission-fixedly connected to the driving force rod of the motor push rod body 51, so as to effectively drive the shift ring seat 61 to synchronously shift along the annular assembly chamber 31 through the linear kinetic energy transmitted by the driving force rod.

[0083] As a preferred solution of this embodiment, a component assembly opening is provided on the inner side of the shift ring seat 61 corresponding to the inner wall position of the liquid feeding extension tube body 3, and a second sealing rubber pad 611 is elastically fixedly provided on the assembly opening, and the second sealing rubber pad 611 is configured as a second soft silicone part, so as to utilize the second sealing rubber pad 611 to effectively ensure the sealing protection performance of the component assembly opening.

[0084] The adaptive spring supports 62 are arranged in a number of groups evenly corresponding to each other along the circumference based on the shift ring seat 61. The adaptive spring supports 62 in the groups are respectively slidably assembled in the assembly chamber 31 of the liquid feeding extension tube body 3, and one end portion of the adaptive spring supports 62 in the groups are transmission-fixedly connected to the shift ring seat 61, so as to effectively drive the adaptive spring supports 62 to synchronously shift along the annular assembly chamber 31 through the shift ring seat 61; each group of the adaptive spring supports 62 is provided with the buffer spring 63, so as to make the adaptive spring supports 62 have adaptive elastic performance.

[0085] The transmission extension rod 64 and the positioning drive rack 65 are each arranged in a plurality of groups corresponding to the inside of the assembly chamber 31, wherein one end of the transmission extension rod 64 along the extension direction thereof and the other end of the adaptive spring support frame 62 are respectively and one-to-one correspondingly transmission-fixedly connected; the positioning drive rack 65 is respectively and one-to-one correspondingly located at the outer position of the other end of the transmission extension rod 64, and the positioning drive rack 65 is all fixedly arranged on the inner wall of the assembly chamber 31; the transmission extension rod 64 is used to effectively serve as a transfer drive structure of the liquid flow deceleration structure 7, and the positioning drive rack 65 is used as a transfer limit structure of the liquid flow deceleration structure 7.

[0086] More specifically, the liquid flow deceleration structure 7 is provided with several groups, and each group of the liquid flow deceleration structure 7 includes a transfer deceleration rod body 71, a transfer drive gear 72 and a third blocking rubber pad 73; wherein, one end shaft portion of the transfer deceleration rod body 71 is coaxially fixedly connected to the transfer drive gear 72, and one end shaft portion of the transfer deceleration rod body 71 is transfer-assembled and connected to the other end portion of the transmission extension rod 64 along its extension direction, and the transfer drive gear 72 is meshed and assembled with the positioning drive rack 65, so as to realize that the linear kinetic energy transmitted by the transmission extension rod 64 synchronously drives the transfer drive gear 72 to rotate based on the positioning drive rack 65, and then the transfer drive gear 72 synchronously drives the transfer deceleration rod body 71, so that the transfer deceleration rod body 71 can flip a specific angle according to the monitored flow rate with a preset ratio calculation result, and then realize the adaptive deceleration function of the corresponding liquid agent flowing through through a plurality of transfer deceleration rod bodies 71, thereby effectively improving the flow rate stability and safety of the liquid agent spraying.

[0087] The third sealing rubber pad 73 is configured as a third soft silicone component, and the third sealing rubber pad 73 is elastically positioned to the corresponding position of the inner wall of the transfer deceleration rod body 71 passing through the liquid feeding extension tube body 3, and the third sealing rubber pad 73 is fitted on the outer side of the transfer deceleration rod body 71, so that when the transfer deceleration rod body 71 is flipped, the third sealing rubber pad 73 can effectively adapt to the transmission position of the transfer deceleration rod body 71 to maintain sealing based on its own flexible stretchable and compressible effects.

[0088] As another preferred scheme of this embodiment, the driving force required by the transmission extension rod 64 to drive the indexing drive gear 72 to rotate and advance on the positioning drive rack 65 is less than the driving force required for the compression of the buffer spring 63, so that the linear kinetic energy of the shift ring seat 61 can be effectively transmitted to the transmission extension rod 64 and the indexing drive gear 72 through the adaptive spring support 62, and at the same time, when decelerating the liquid, several indexing deceleration rod bodies 71 can be subjected to the impact pressure and the viscosity of the liquid to produce a certain degree of return and flipping. At this time, the driving force of the indexing drive gear 72 and the compression driving force further transmitted to the buffer spring 63 can be overcome in turn, thereby avoiding excessive blocking of the liquid and improving functional practicality.

[0089] As another preferred solution of this embodiment, please continue to refer to Figure 5 The indexing deceleration rod body 71 is configured as a strip plate structure, and the side edges of the indexing deceleration rod body 71 of the strip plate are configured as rounded corners, and the end of the indexing deceleration rod body 71 of the strip plate away from the indexing driving gear 72 is configured as a rounded tip, so as to significantly improve the smoothness of the liquid flowing through the indexing deceleration rod body 71 with the help of the ejection force, reduce the friction resistance encountered by the liquid after deceleration, and further effectively avoid excessive blocking of the liquid.

[0090] As another preferred solution of this embodiment, the liquid feeding extension tube body 3 is fixedly provided with a smooth outer cover corresponding to the outer side of the micro-motor push rod 5, so as to be suitable for natural cavity insertion and drug delivery.

[0091] The embodiment of the present invention further provides an application method of a drug delivery device based on an automatic piston mechanism, which specifically comprises the following steps:

[0092] The piston start lever 22 in the automatic piston assembly 2 is pressed, and the electric control structure receives the start signal and sends a control command to start the automatic piston body 21 in the automatic piston assembly 2. The automatic piston body 21 repeatedly works to form a pressure difference corresponding to the liquid container 1, and the liquid in the liquid container 1 is extracted by the pressure difference and transferred to the liquid feeding extension tube 3 for continuous drug delivery;

[0093] The flow rate monitoring sensor 4 can monitor the flow rate of the liquid continuously flowing through the liquid feeding extension tube 3 in real time, and the monitored flow rate data signal can be sent to the electronic control structure in real time. The electronic control structure calculates the driving value based on the received flow rate data signal and its preset deceleration ratio and issues a control instruction. The micro motor push rod 5 outputs linear kinetic energy of a specific driving value through its driving force rod based on the control instruction.

[0094] The linear kinetic energy transmitted by the driving force rod effectively drives the shift ring seat 61 in the flow rate control structure 6 to synchronously shift along the built-in annular assembly chamber 31 of the liquid feeding extension tube body 3, and the shift ring seat 61 drives several groups of adaptive spring supports 62 and the transmission extension rod 64 in the flow rate control structure 6 to synchronously shift along the annular assembly chamber 31. The linear kinetic energy transmitted by the transmission extension rod 64 synchronously drives the indexing drive gear 72 in the liquid flow deceleration structure 7 to rotate based on the positioning drive rack 65, and then the indexing drive gear 72 synchronously drives the indexing deceleration rod body 71 in the liquid flow deceleration structure 7, so that the indexing deceleration rod body 71 flips a specific angle according to the monitored flow rate and the preset ratio calculation result to adaptively decelerate the liquid flowing through it.

[0095] When decelerating the liquid, the plurality of indexing deceleration rods 71 ​​are subjected to the impact pressure and the viscosity of the liquid. At this time, the plurality of indexing deceleration rods 71 ​​successively overcome the driving force of the indexing driving gear 72 and the compression driving force further transmitted to the buffer spring 63 to generate a certain amount of return flipping to avoid excessive blocking of the liquid.

[0096] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A drug delivery device based on an automatic piston mechanism, characterized in that: include: A liquid medicine container, used for storing liquid medicine; An automatic piston assembly, wherein the liquid agent input end is connected to the liquid medicine container, and the automatic piston assembly is provided with a piston start end for starting the automatic piston; A liquid feeding extension tube body is connected to the liquid output end of the automatic piston assembly, and an annular assembly chamber is provided between the inner and outer walls of the liquid feeding extension tube body; A flow rate monitoring sensor is correspondingly arranged in the liquid passage of the liquid feeding extension tube body; A micro motor push rod is connected to the flow rate monitoring sensor via a circuit, and the micro motor push rod has a straight line kinetic energy output end; The liquid flow deceleration structure is provided with a plurality of groups, and the plurality of groups of the liquid flow deceleration structure are respectively and reversibly arranged at intervals in the liquid passage of the liquid feeding extension tube body, and the plurality of groups of the liquid flow deceleration structure are respectively connected with the transmission assembly between the linear kinetic energy output end of the micro-motor push rod, and the plurality of groups of the liquid flow deceleration structure can convert the received linear kinetic energy into rotational kinetic energy; The drug delivery device further comprises: A flow rate control structure is slidably disposed on the inner wall of the liquid path of the liquid feeding extension tube body, and the flow rate control structure is connected to the linear kinetic energy output end of the micro-motor push rod by a transmission assembly; The liquid flow deceleration structure and the flow rate regulating structure are connected by a transmission assembly; The flow rate regulating structure comprises a shift ring seat, an adaptive spring support, a transmission extension rod and a positioning drive rack; Each group of the adaptive spring supports is equipped with a buffer spring; Each group of the fluid flow deceleration structures comprises an indexing deceleration rod body and an indexing driving gear; One end shaft portion of the indexing reduction rod body is coaxially fixedly connected to the indexing driving gear, and one end shaft portion of the indexing reduction rod body is connected to the other end portion of the transmission extension rod along its extension direction by transfer assembly; The indexing drive gear and the positioning drive rack are meshed and assembled.

2. The drug delivery device based on the automatic piston mechanism according to claim 1, characterized in that: The liquid medicine container is provided with a liquid medicine suction tube; The automatic piston assembly comprises an automatic piston body and a piston starter lever, and the automatic piston assembly is equipped with an electric control structure; The automatic piston body is connected to the control output end of the electric control structure through a circuit; the input end of the automatic piston body is connected to the liquid suction tube, and the output end of the automatic piston body is connected to the liquid feeding extension tube; The piston start push rod is assembled on the automatic piston body, and the piston start push rod is connected to the control input end of the electric control structure through a circuit.

3. The drug delivery device based on the automatic piston mechanism according to claim 2, characterized in that: The flow rate monitoring sensor is fixedly mounted on the outer wall of the liquid supply extension tube, and the monitoring probe of the flow rate monitoring sensor is fixed to the inner wall of the liquid path of the liquid supply extension tube through a sealed extension, and the flow rate monitoring sensor is connected to the control input end of the electric control structure through a circuit; The micro motor push rod is fixedly mounted on the outer wall of the liquid feeding extension tube body, and the micro motor push rod is connected to the control output end of the electric control structure through a circuit.

4. The drug delivery device based on the automatic piston mechanism according to claim 3, characterized in that: The micro motor push rod comprises a motor push rod body; The base of the motor push rod body is fixedly mounted on the outer wall of the liquid feeding extension tube body, and the linear kinetic energy output end of the motor push rod body is transmission-fixedly mounted with a driving force rod, which passes through the outer wall of the liquid feeding extension tube body and extends to the assembly chamber of the liquid feeding extension tube body; The shift ring seat is configured as a channel-type ring seat, and the channel-type shift ring seat has a built-in sliding assembly arranged in the assembly chamber of the liquid feeding extension tube body, and the channel-type shift ring seat is transmission-fixedly connected to the driving force rod of the motor push rod body, and the linear kinetic energy transmitted by the driving force rod can drive the shift ring seat to synchronously shift along the annular assembly chamber.

5. The drug delivery device based on the automatic piston mechanism according to claim 4, characterized in that: The adaptive spring supports are uniformly arranged in a plurality of groups along the circumference of the displacement ring seat, and the plurality of groups of adaptive spring supports are respectively slidably assembled in the assembly chamber of the liquid feeding extension tube body, and one end of the plurality of groups of adaptive spring supports are all transmission-fixedly connected to the displacement ring seat; The transmission extension rods and the positioning drive racks are each arranged in a plurality of groups corresponding to the inside of the annular assembly chamber, and one end of the transmission extension rods of the plurality of groups along their extension direction is respectively and one-to-one correspondingly connected to the other end of the adaptive spring support frame; the positioning drive racks of the plurality of groups are respectively and one-to-one correspondingly located at the outer side of the other end of the transmission extension rods of the plurality of groups, and the positioning drive racks of the plurality of groups are all fixedly connected to the inner wall of the assembly chamber.

6. The drug delivery device based on the automatic piston mechanism according to claim 5, characterized in that: The micro motor push rod also includes a first sealing rubber pad; The first plugging rubber pad is configured as a first soft silicone member, and the first plugging rubber pad is positioned to a position where the driving force rod passes through the outer wall of the liquid feeding extension tube body through its elastic action; The first sealing rubber pad is fitted on the outer side of the driving force rod, and is used to adaptively adapt to the transmission position of the driving force rod to maintain sealing based on its own flexible stretchability and compression when the motor push rod body outputs linear kinetic energy through the driving force rod.

7. The drug delivery device based on the automatic piston mechanism according to claim 5, characterized in that: The liquid flow deceleration structure also includes a third sealing rubber pad; The third sealing rubber pad is configured as a third soft silicone member, and the third sealing rubber pad is positioned to a position corresponding to the inner wall of the indexing deceleration rod body passing through the liquid feeding extension tube body through its elastic action; The third sealing rubber pad is fitted on the outer side of the indexing deceleration rod body, and is used for adapting the transmission position of the indexing deceleration rod body to maintain sealing based on its own flexible stretching and compression when the indexing deceleration rod body is flipped.

8. The drug delivery device based on the automatic piston mechanism according to claim 5, characterized in that: The driving force required by the transmission extension rod to drive the indexing drive gear to rotate and advance on the positioning drive rack is smaller than the driving force required for compressing the buffer spring.

9. The drug delivery device based on the automatic piston mechanism according to claim 5, characterized in that: The transfer deceleration rod body is configured as a strip plate structure; The side edges of the indexing reduction rod body of the strip plate body are all arranged with rounded corners, and the end of the indexing reduction rod body of the strip plate body away from the indexing driving gear is arranged with a rounded tip.

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