CN108114342B

CN108114342B - Push head assembly, medicine supply infusion device and medicine supply infusion system

Info

Publication number: CN108114342B
Application number: CN201711366279.5A
Authority: CN
Inventors: 朱珊莹
Original assignee: South Central University for Nationalities
Current assignee: South Central Minzu University
Priority date: 2017-12-18
Filing date: 2017-12-18
Publication date: 2020-07-24
Anticipated expiration: 2037-12-18
Also published as: CN108114342A

Abstract

The invention relates to the field of medical equipment and discloses a pushing head assembly, a medicine supply infusion device and a medicine supply infusion system. The pushing head assembly comprises a fixing piece fixed on the pushing head seat, a pushing piece movably connected to the fixing piece, an eccentric wheel mechanism and a pressure sensor. When the eccentric wheel of the eccentric wheel mechanism rotates, the large diameter of the eccentric wheel can be periodically abutted against the pressure sensor on the limiting part, and the pushing piece is driven to carry out liquid medicine pushing in a pulse mode. The amount of thrust of the pusher assembly is adjusted while keeping the pressure (peak value) stable, thereby facilitating stable supply of the chemical solution. When the eccentric continues to rotate and the peak pressure is constant, it means that a liquid blockage may occur. The structure is simple, stable and easy to realize, the cost is lower, the liquid medicine can be stably and continuously pushed, and abnormal phenomena such as blockage and the like are easy to discover. The medicine supply infusion device and the medicine supply infusion system comprise the pushing head assembly, so that the beneficial effects are achieved.

Description

Push head assembly, medicine supply infusion device and medicine supply infusion system

Technical Field

The invention relates to the field of medical equipment, in particular to a pushing head assembly, a medicine supply infusion device and a medicine supply infusion system.

Background

After the completion of the operation, local anesthesia may be continued for a long time on the wound or the operation site, and when the anesthesia operation is to be completed, an infusion pump (analgesic pump) is often required. The main principle is that the anesthetic is slowly infused to the pain part according to a small amount by adjusting the pressure or the flow of an infusion system. At present, two types of infusion pumps are mainly used, namely a passive silica gel pressure tube providing power and an electronic peristaltic pump adjustable control type.

The main problems of the existing silica gel tube type infusion pump are that the stability of product quality is controlled fussy, the assembly is produced and assembled more fussy, and the product control is more strict and fussy. Meanwhile, the volume of the liquid medicine to be input is reduced along with the input liquid medicine input into a human body in the infusion process of the silicone tube, so that the expansion degree of the silicone tube is reduced, the infusion pressure is reduced, the flow is reduced, and the conveying stability is poor. The adjustable and controllable infusion pump of the electronic peristaltic pump has the main defects of high cost and serious resource waste.

Disclosure of Invention

The invention aims to provide a push head assembly which can stably supply micro-amount medicine and has low cost.

Another object of the present invention is to provide a drug delivery infusion device which can stably deliver a small amount of drug and is low in cost.

It is still another object of the present invention to provide a drug delivery infusion system, which includes the above drug delivery infusion device, and can stably deliver a small amount of drug at a low cost.

The embodiment of the invention is realized by the following steps:

a push head assembly is used for pushing liquid medicine, and comprises a fixing piece fixed on a push head seat, a pushing piece movably connected to the fixing piece and an eccentric wheel mechanism, wherein the pushing piece can move in a first preset direction relative to the fixing piece; the pushing piece is provided with a first end and a second end, the first end is used for abutting against a piston of the liquid medicine conveying device, the second end is abutted against a limiting part arranged on the fixing piece through an eccentric wheel mechanism, and a pressure sensor is arranged on one side of the limiting part facing the pushing piece;

the eccentric wheel mechanism comprises an eccentric wheel and a third driving part for driving the eccentric wheel to rotate, and the eccentric wheel mechanism can move in a first preset direction relative to the fixing piece; when the eccentric wheel rotates, the large diameter of the eccentric wheel can be periodically abutted against the pressure sensor on the limiting part, and the second end of the pushing piece is connected with the eccentric wheel mechanism through a spring.

In an embodiment of the present invention, the eccentric wheel mechanism of the above-mentioned pushing head assembly further includes a motor base, the eccentric wheel is rotatably connected to the motor base, and the motor base is movable in a first predetermined direction relative to the fixing member; one end of the spring is connected with the motor base.

In an embodiment of the invention, the fixing member of the pushing head assembly is fixedly provided with a rail seat, the rail seat is provided with a rail extending along a first preset direction, and the motor seat is slidably connected to the rail.

In an embodiment of the invention, the limiting portion of the pushing head assembly is a supporting plate disposed on the rail seat, and the pressure sensor is disposed on a side of the supporting plate facing the first predetermined direction.

In an embodiment of the invention, a second end of the pushing member of the pushing head assembly is provided with a waist-shaped hole, the waist-shaped hole has a preset width in a first preset direction, and the fixing member is movably linked with the pushing member through a limiting bolt penetrating through the waist-shaped hole.

In an embodiment of the present invention, the pushing head assembly further includes a locking assembly, and the locking assembly can slide in a first preset direction relative to the fixing member; the fixing piece is provided with a pressure strain gauge which can abut against the locking assembly when the locking assembly moves back to the first preset direction; the locking assembly comprises a locking part which can be selectively and fixedly connected with the pushing part so as to keep the relative position of the locking assembly and the pushing part fixed.

In an embodiment of the present invention, the locking portion of the locking assembly of the pushing head assembly is a pin wheel, the pin wheel has a pin, and the pushing member has a pin groove; the pin can selectively cooperate with the pin groove when the pin wheel rotates, so that the locking assembly and the pushing piece are relatively fixed.

The invention provides a medicine supply infusion device which comprises a driving assembly and the push head assembly, wherein the driving assembly is provided with a push head seat, the push head assembly is arranged on the push head seat, and the driving assembly is used for driving the push head seat to move in a first preset direction.

In an embodiment of the present invention, the drive assembly of the drug delivery and infusion device includes:

the rapid feeding assembly comprises a base and a first driving mechanism arranged on the base;

the micro-feeding assembly comprises a base, a second driving part and a push head seat, wherein the base is in transmission connection with the first driving mechanism;

the micro-feeding assembly can move along a first preset direction under the driving of the first driving mechanism, and the push head seat can move along the first preset direction under the driving of the second driving portion.

A drug delivery infusion system comprises the drug delivery infusion device and a liquid medicine conveying device, wherein the liquid medicine conveying device comprises a medicine cylinder, a piston which is in sealing contact with the inner wall of the medicine cylinder is arranged in the medicine cylinder, a throttling pipe assembly is arranged at one end of the medicine cylinder, and the throttling pipe assembly is communicated with the medicine cylinder; the push head assembly is used for pushing the piston in a first preset direction.

The embodiment of the invention has the beneficial effects that:

the pushing head assembly comprises a fixing piece fixed on a pushing head seat, a pushing piece movably connected to the fixing piece and an eccentric wheel mechanism, wherein the pushing piece can move in a first preset direction relative to the fixing piece; the pushing eccentric wheel mechanism is abutted against a limiting part arranged on the fixing piece, and a pressure sensor is arranged on one side of the limiting part, which faces the pushing piece. When the eccentric wheel of the eccentric wheel mechanism rotates, the large diameter of the eccentric wheel can be periodically abutted against the pressure sensor on the limiting part, and the second end of the pushing piece is connected with the eccentric wheel mechanism through a spring. Therefore, with the structure, the pressure sensor can periodically detect the pressure when the spring is compressed to the maximum extent, namely the pushing force of the pushing piece, when the peak value of the detected pressure is gradually reduced, the pushing head assembly can be pushed towards the first preset direction, so that the pressure is stabilized within a preset range again, and therefore the liquid medicine can be always extruded by the periodic pressure, and the peak value of the pressure can be stabilized within a preset range. Thus, stable supply of the chemical liquid is realized. When the eccentric continues to rotate and the peak pressure is constant, it means that a liquid blockage may occur. The structure is simple, stable and easy to realize, and the cost is lower.

The medicine supply infusion device and the medicine supply infusion system comprise the pushing head assembly, the system is simple and stable, the cost is low, micro-infusion of liquid medicine can be completed stably, and whether liquid medicine blockage occurs or not can be judged conveniently.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a drug delivery infusion device in embodiment 1 of the present invention;

FIG. 2 is a schematic structural view of a fast-feeding assembly in embodiment 1 of the present invention;

FIG. 3 is a schematic view showing the installation of the micro-feed assembly in example 1 of the present invention;

fig. 4 is a schematic structural view of a pusher assembly in embodiment 1 of the present invention;

FIG. 5 is a schematic structural view of a rapid clamp according to embodiment 1 of the present invention;

FIG. 6 is a schematic structural view of a liquid medicine delivery device in example 1 of the present invention;

fig. 7 is a schematic structural view of a drug delivery infusion device according to embodiment 2 of the present invention;

fig. 8 is a schematic structural view of a pusher assembly in embodiment 2 of the present invention;

FIG. 9 is an enlarged view of detail IX of FIG. 8;

fig. 10 is a schematic structural view of a drug delivery infusion device according to embodiment 3 of the present invention;

fig. 11 is a schematic structural view of a pusher assembly in embodiment 3 of the present invention.

Icon: 100-a drug delivery infusion device; 110-a fast feed assembly; 111-a base; 112-a first drive; 113-a lead screw; 114-a first guide rail; 115-a first slider; 116-a nut seat; 120-a micro-feeding assembly; 121-a base; 122-a pitch-variable screw; 123-a threaded seat; 124-a carrier seat; 125-a second drive section; 126-a second guide rail; 127-drive section slider; 130-a pusher assembly; 131-a fixing member; 132-a pusher; 132 a-a first end; 132 b-a second end; 133-a pressure sensor; 134-a limiting part; 135-a spring; 136-kidney shaped hole; 137-limit bolt; 140-a quick clamp; 141-a clamping block; 142-a buckle; 210-a drug delivery device; 211-a cartridge; 212-a piston; 213-extension tube; 214-a microtube; 215-a filter; 216-an injection fitting; 217-luer fitting; 300-a drug delivery infusion device; 310-a pusher assembly; 330-eccentric wheel; 331-a motor base; 332-a third drive section; 333-spring seat; 334-a push rod; 335-a support plate; 336-rail seat; 400-a drug delivery infusion device; 410-a pusher assembly; 430-a locking assembly; 431-a pin wheel; 432-fourth drive; 433-a mounting seat; 434-compressive strain gage.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are only used for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Fig. 1 is a schematic structural view of a drug delivery infusion apparatus 100 according to embodiment 1 of the present invention. Referring to fig. 1, the present embodiment provides a drug delivery infusion device 100, which includes a fast feeding assembly 110, a micro-feeding assembly 120 in transmission connection with the fast feeding assembly 110, and a pushing head assembly 130 disposed on the micro-feeding assembly 120, wherein the pushing head assembly 130 is used for pushing a piston 212 of a drug delivery device 210. The fast feed assembly 110 is capable of driving the micro-feed assembly 120 to move faster (relative to the pushing speed of the micro-feed assembly 120) in the first predetermined direction, and the micro-feed assembly 120 is capable of further driving the push head assembly 130 to move in the first predetermined direction.

Fig. 2 is a schematic structural diagram of the fast feeding assembly 110 in embodiment 1 of the present invention. Referring to fig. 2, in the present embodiment, the fast feeding assembly 110 includes a base 111 and a first driving mechanism disposed on the base 111. The base 111 is plate-shaped, and the first driving mechanism is disposed on an upper surface of the base 111.

The first driving mechanism includes a first driving portion 112 fixed to the base 111, a lead screw 113 extending in a first predetermined direction, and a nut holder 116 screwed to the lead screw 113. Two first guide rails 114 are laid on the base 111, and the two first guide rails 114 are arranged in parallel at intervals and extend along a first preset direction. The first rail 114 is fastened to the base 111 by screws. The first driving part 112 is fixedly connected to the base 111 through a seat body, and can drive the screw 113 to rotate. Therefore, the relative positions of the first driving portion 112, the base 111 and the first guide rail 114 are kept unchanged.

The first guide rail 114 is provided with a first slider 115, the first slider 115 is slidable in a first predetermined direction with respect to the first guide rail 114, and the first slider 115 is fixedly connected to the base 121 of the micro-feed unit 120. Two first sliding blocks 115 are respectively arranged on each first guide rail 114 in a sliding manner, the four first sliding blocks 115 and the nut base 116 are fixedly connected with the micro-feeding assembly 120, when the lead screw 113 rotates, the nut base 116 is driven to move in a first preset direction, so that the nut base 116 drives the micro-feeding assembly 120 to move, the micro-feeding assembly 120 is connected with the first guide rail 114 in a sliding manner through the first sliding blocks 115, and the first sliding blocks 115 play a role in stabilizing the micro-feeding assembly 120.

Fig. 3 is a schematic view of the installation of the micro feeding unit 120 in embodiment 1 of the present invention. Referring to fig. 3 in combination with fig. 2, in the present embodiment, the micro-feeding assembly 120 includes a base 121, a screw seat 123 fixedly disposed on the base 121, a pitch-variable screw 122 threadedly coupled to the screw seat 123, a second driving portion 125 driving the pitch-variable screw 122 to rotate, and a head-pushing seat 124 threadedly coupled to the pitch-variable screw 122. The base 121 is a plate, and the lower surface thereof is fixedly connected to the first slider 115 and the nut seat 116. And thus can move in a first preset direction relative to the base 111 under the driving of the first driving mechanism.

In the present embodiment, the base 121 of the micro feeding assembly 120 is provided with a second guide rail 126 extending along a first predetermined direction, the second driving unit 125 is slidably connected to the second guide rail 126 through a driving unit slider 127 and is in transmission connection with one end of the pitch-variable screw 122, and the push head base 124 is slidably connected to the second guide rail 126 through another slider. In order to ensure the stability of the second driving part 125 and the push rod seat 124, the second guide rails 126 are arranged in parallel and spaced, and the screw seat 123 is arranged between the two second guide rails 126. The pitch-variable screw 122 extends along a first preset direction and can rotate around the axis thereof, the pitch-variable screw 122 has a first thread (not shown) and a second thread (not shown), the pitch of the second thread is smaller than that of the first thread, the first thread is in threaded connection with the thread seat 123, the second thread is in threaded connection with the push head seat 124, and the push head seat 124 can slide in the first preset direction relative to the base 121. In the present embodiment, the screw base 123 is located between the second driving part 125 and the pushing head base 124, the first thread is a thread with a right-handed thread pitch of 2.05mm, the second thread is a thread with a right-handed thread pitch of 2.00mm, and the second driving part 125 can be selected as a stepping motor.

The micro-feed assembly 120 operates by the mechanism that when the second driving part 125 drives the pitch screw 122 to rotate rightwards for one turn, the second driving part 125 and the pitch screw 122 move rightwards by 2.05mm relative to the base 121 because the screw seat 123 is fixed; since the push head seat 124 is engaged with the second thread with the thread pitch of 2.00mm, it moves 2.00mm to the left with respect to the pitch-variable screw 122, and in general, the push head seat 124 moves 0.05mm to the right with respect to the base 121, so that micro-propulsion is realized. It should be understood that in other embodiments of the present invention, the pitch values of the first and second threads may be adjusted to change the pushing amount of the pushing head seat 124 when the pitch-variable screw 122 rotates for one turn.

Fig. 4 is a schematic structural diagram of the pusher assembly 130 according to embodiment 1 of the present invention. Referring to fig. 4 in conjunction with fig. 1 to fig. 3, in the present embodiment, the pushing head assembly 130 includes a fixing member 131 fixed to the pushing head base 124 and a pushing member 132 movably connected to the fixing member 131, and the pushing member 132 can move in a first predetermined direction relative to the fixing member 131; the pushing member 132 has a first end 132a and a second end 132b, the first end 132a is used for abutting against a piston 212 (see fig. 1) of the liquid medicine delivery device 210, the second end 132b is used for abutting against a limiting portion 134 arranged on the fixing member 131, and a pressure sensor 133 is arranged on one side of the limiting portion 134 facing the pushing member 132, in this embodiment, the pressure sensor 133 is a pressure strain gauge.

In this embodiment, the fixing member 131 includes a cylinder having a cavity, and the fixing member 131 is fixedly disposed on the thrust base 124, and an axis thereof extends along a first predetermined direction. The limiting part 134 is disposed at an opening of one end of the cylinder and closes the end. The other end of the cylinder opens in a first predetermined direction, and a second end 132b of the pushing member 132 protrudes into the fixing member 131 from this end and can move in the first predetermined direction relative to the fixing member 131. Specifically, the pushing member 132 is a shaft, the second end 132b of the pushing member 132 has a smaller diameter and forms a stepped shaft, and the stepped surface extends into the barrel and is connected to the limiting portion 134 through a spring 135. In the embodiment, the spring 135 is sleeved on the second end 132b of the pushing element 132, and the spring 135 does not directly abut against the pressure sensor 133. In addition, the second end 132b of the pushing element 132 is provided with a waist-shaped hole 136, the waist-shaped hole 136 has a width extending in the first preset direction, the fixing element 131 is also provided with a hole, and the pushing element 132 is movably connected with the fixing element 131 through a limit bolt 137 penetrating through the waist-shaped hole 136, so that the pushing element can move a small distance in the first preset direction.

The spring 135 is used for providing a pushing force towards the first preset direction to the pushing member 132, so that the pushing member 132 has a tendency to be away from the limiting portion 134, and the second end 132b of the pushing member 132 does not press the pressure sensor 133 on the limiting portion 134 when the drug solution delivery device 210 is not pressed. When the first end 132a of the pushing member 132 abuts against the drug delivery device 210, the pushing member 132 compresses the spring 135 leftward, so as to abut against the pressure sensor 133, the pressure sensor 133 can receive a pressure signal and transmit the pressure signal to a controller (not shown), and the controller can control the fast feeding assembly 110 to stop moving rightward and start to start the micro feeding assembly 120 to perform micro drug feeding. When the pressure is maintained within a predetermined range, the micro-feeding assembly 120 continues to operate, and when the pressure rises beyond the predetermined range, which means that an infusion blockage may occur, the controller may stop the micro-feeding assembly 120, thereby preventing damage to the device or the human body. Therefore, the controller can also be electrically connected with an alarm device (not shown), and when the pressure is abnormal, the alarm device is started to give an alarm.

Fig. 5 is a schematic structural diagram of the rapid clamp 140 according to embodiment 1 of the present invention. Referring to fig. 1 and 5, in order to ensure the stability of the cartridge 211 of the medical fluid delivery device 210 during the medical fluid infusion, the medical fluid infusion device 100 further includes a quick clamp 140, and the quick clamp 140 is fixed relative to the bottom plate, which is disposed at the front end of the bottom plate facing the first predetermined direction, i.e., the right end shown in fig. 1. The quick clamp 140 includes two clamp blocks 141 for clamping the cartridge 211, and one side of the two clamp blocks 141 is hinged together and the other side is connected by a snap 142. The cartridge 211 can be easily attached and detached by opening or closing the latch 142.

The present embodiment further provides a drug delivery infusion system, which includes the drug delivery infusion device 100, a controller (not shown), and a medical fluid delivery device 210. The controller is electrically connected to the pressure sensor 133, the first driving unit 112, and the second driving unit 125, and can control the respective driving units to be turned on or off according to the pressure signal. In other embodiments, the controller may not be provided, and the opening or closing of each driving portion may be manually controlled by manually observing the operating position of the pushing member 132.

Fig. 6 is a schematic structural diagram of a liquid medicine delivery device 210 according to embodiment 1 of the present invention. Referring to fig. 6 in combination with fig. 1, the drug delivery device 210 comprises a drug cartridge 211, and a throttle tube assembly disposed at one end of the drug cartridge 211, the throttle tube assembly being in communication with the drug cartridge 211. The medicine container 211 has a piston 212 therein, the piston 212 is in sealing contact with the inner wall of the medicine container 211 and can slide relative to the medicine container 211, and the second end 132b of the pushing member 132 is used for pushing the piston 212 to move in a first preset direction.

Specifically, the throttle tube assembly includes an extension tube 213, a micro tube 214, a filter 215, and an injection connector 216 connected in series. The extension tube 213 communicates with the cartridge 211 via a luer fitting 217, and more particularly, the extension tube 213 is connected via a luer female fitting provided at the end to a locking cap on the cartridge 211, which is a common luer fitting 217 accessory. The micro tube 214 is used to limit the flow rate of the liquid medicine supply, and in this embodiment, a tube diameter of 7 microns is used, and in other embodiments, the tube diameter can be adjusted.

The working principle of the drug delivery infusion device 100 and the drug delivery infusion system is as follows:

in use, the drug container 211 containing the drug solution is mounted on the quick clamp 140, and the piston 212 in the drug container 211 faces the second end 132b of the pushing member 132. The first drive mechanism is activated, the micro-feed assembly 120 moves to the right, and the pusher 132 abuts the piston 212. At this time, the pressure sensor 133 receives the pressure signal and sends it to the controller, and the controller controls the first driving part 112 to stop moving and starts the second driving part 125, at which time the micro-feeding assembly 120 starts to work. The micro-feeding assembly 120 pushes the pushing head assembly 130 slowly, and the pushing member 132 pushes the piston 212 to complete the liquid medicine supply. When the blockage occurs, the pressure sensor 133 senses the increased pressure, and when the pressure exceeds a preset range, the controller may control the second driving part 125 to stop operating, thereby protecting the equipment or the human body. The whole process is stable and efficient, the cost is low, and the use requirements of medical workers can be met.

Example 2

Fig. 7 is a schematic structural view of a drug delivery infusion device 300 according to embodiment 2 of the present invention. Referring to fig. 7, the present embodiment provides a pushing head assembly 310, a drug delivery infusion apparatus 300 and a drug delivery infusion system, the drug delivery infusion apparatus 300 and the drug delivery infusion system of the present embodiment are substantially the same as the drug delivery infusion apparatus 100 and the drug delivery infusion system of embodiment 1, and the difference is that the structure of the pushing head assembly 310 is different from that of the pushing head assembly 130 of embodiment 1.

Fig. 8 is a schematic structural diagram of the pusher head assembly 310 according to embodiment 2 of the present invention; fig. 9 is an enlarged view of a portion IX in fig. 8. Referring to fig. 8 and fig. 9 in combination with the related drawings of embodiment 1, in this embodiment, the pushing head assembly 310 includes a fixing member 131 fixed to the pushing head base 124 and a pushing member 132 movably connected to the fixing member 131, and the pushing member 132 can move in a first predetermined direction relative to the fixing member 131; the pushing member 132 has a first end 132a and a second end 132b, the first end 132a is used for abutting against a piston 212 (see fig. 6) of the liquid medicine delivery device 210, the second end 132b is used for abutting against a limiting portion 134 arranged on the fixing member 131, and a pressure sensor 133 is arranged on one side of the limiting portion 134 facing the pushing member 132. The fixing member 131 is provided with an eccentric wheel mechanism, and the second end 132b of the pushing member 132 is abutted with the limiting part 134 of the fixing member 131 through the eccentric wheel mechanism; the eccentric wheel mechanism comprises a motor base 331, an eccentric wheel 330 rotatably connected to the motor base 331, and a third driving part 332 for driving the eccentric wheel 330 to rotate, wherein the motor base 331 can move in a first preset direction relative to the fixing member 131; the eccentric wheel 330 can periodically abut against the pressure sensor 133 on the limiting part 134 when rotating, and the second end 132b of the pushing part 132 is connected with the motor base 331 through the spring 135.

Specifically, the fixing element 131 is a cylinder with two open ends, the second end 132b of the pushing element 132 extends into the fixing element 131, the second end 132b has a waist-shaped hole 136, the waist-shaped hole 136 has a certain width in the first preset direction, and the pushing element 132 is movably connected with the fixing element 131 through a limiting bolt 137, so that the pushing element 132 can make a small displacement in the first preset direction. The stationary member 131 is fixedly provided at a left side thereof with a rail mount 336 on which a rail extending in a first predetermined direction is provided, and a motor mount 331 of the eccentric mechanism is slidably coupled to the rail mount so that the eccentric mechanism can move in the first predetermined direction with respect to the stationary member 131. A push rod 334 is disposed on one side of the motor base 331 facing the first predetermined direction, and the push rod 334 extends into the fixing member 131 and is opposite to the second end 132b of the pushing member 132. The pusher 132 is connected to the push rod 334 by a spring 135, the spring 135 being in a compressed state. A spring seat 333 is connected to the left side of the spring 135, and the spring seat 333 is plate-shaped. The interior of the mount 131 has a stepped surface so that the spring seat 333 on the left side of the spring 135 is not ejected out of the mount 131.

The rail seat 336 is provided with a supporting plate 335, and a seat body is arranged on one side of the supporting plate 335 facing the first predetermined direction, and the pressure sensor 133 is arranged on the seat body. Therefore, the relative positions of the pressure sensor 133, the support plate 335, the rail base 336 and the fixing member 131 are fixed, and the eccentric wheel mechanism and the pushing member 132 can move left and right with respect to the fixing member 131. In the present embodiment, when the spring seat 333 is at the leftmost end, the eccentric wheel mechanism is also at the leftmost end, and the distance between the axis of the eccentric wheel 330 and the pressure sensor 133 is smaller than the major diameter of the eccentric wheel 330 but larger than the minor diameter of the eccentric wheel 330. When the eccentric 330 is rotated by the third driving part 332, the large diameter of the eccentric 330 periodically abuts against the pressure sensor 133 and forces the eccentric 330 assembly to periodically press the spring 135 to the right. When the eccentric 330 abuts against the pressure sensor 133, the spring seat 333 is compressed rightward and the elastic force is completely transmitted to the pressure sensor 133, and when the eccentric 330 does not abut against the pressure sensor 133, the elastic force of the spring 135 is transmitted to the step surface of the fixing member 131.

When the liquid medicine is infused, the second end 132b of the pushing member 132 is pushed leftwards, the left side and the right side of the waist-shaped hole 136 are not abutted to the limiting bolt 137, and at the moment, the elastic force of the spring 135 completely represents the pressure of the infused liquid medicine.

In use of the drug delivery infusion device 300 of the present embodiment, the quick-feed assembly 110 first moves the micro-feed assembly 120 to the corresponding position, and the pushing member 132 abuts against the piston 212 (see fig. 6) of the drug delivery device 210. At this time, the micro-feeding assembly 120 is turned on, the eccentric wheel 330 rotates, the periodic pressure data is collected by the pressure sensor 133, when the piston 212 moves to the right, the pressure becomes smaller in steps, and the micro-feeding assembly 120 drives the pusher assembly 310 to move to the right, so that the pressure is stabilized at a preset value as much as possible (due to the change of the pressure pulse, the stability means the stability of the pressure peak value). When the push head assembly 310 has moved to the extreme right position relative to the micro-feed assembly 120, the fast feed assembly 110 can be controlled to drive the micro-feed assembly 120 to move to the right, and the second drive portion 125 of the micro-feed assembly 120 is reversed, so that the push head assembly 310 moves to the left relative to the base 121 of the micro-feed assembly 120, the position of the fixing member 131 is kept unchanged relative to the environment, and the pressure (peak value) of the pressure sensor 133 is also almost unchanged. When the push head assembly 310 moves to the left extreme position relative to the micro feed assembly 120 (macroscopically, the micro feed assembly 120 moves to the right and the push head assembly 310 hardly moves), the driving of the fast feed assembly 110 is stopped, and the micro feed assembly 120 drives the push head assembly 310 to move to the right again; in this way, the pushing head assembly 310 can have a larger pushing amplitude repeatedly, and the maximum pushing amount of the fast feeding assembly 110 and the micro-feeding assembly 120 is fully utilized, i.e., the structure can have a larger output total amount. Therefore, the infusion device 300 of the present embodiment controls the infusion rate by controlling the pressure, and the technician can adjust the size of the large diameter of the eccentric 330 and the elasticity of the spring 135 to adjust the infusion pressure. For example, when the size of the large diameter of the eccentric 330 is increased, or the circumferential angle of the large diameter is larger, the eccentric mechanism displaces to the right more greatly, or stays to the right for a longer time, and the spring 135 compresses more and lasts for a longer time, so that the infusion rate is increased. Similarly, when the peak pressure of the pressure sensor 133 remains constant during the infusion process, it indicates that the pushing member 132 has not displaced to the right under the pressure, and the pressure does not decrease, which indicates that the piston 212 has not moved and the micro-feed assembly 120 does not control the pushing head assembly 310 to move further to the right. Where a blockage may occur, a controller (not shown) connected to the pressure sensor 133 may be connected to an alarm device (not shown) to generate an alarm signal when the pressure peaks over a plurality of cycles, thereby alerting the technician that a blockage may occur.

The structure of the fast feeding assembly 110 and the micro-feeding assembly 120 of the drug delivery infusion device 300 of this embodiment are the same as those of embodiment 1, and will not be described again here.

Example 3

Fig. 10 is a schematic structural view of a drug delivery infusion device 400 according to embodiment 3 of the present invention. Referring to fig. 10, the present embodiment provides a pushing head assembly 410, a drug delivery infusion apparatus 400 and a drug delivery infusion system, the drug delivery infusion apparatus 400 and the drug delivery infusion system of the present embodiment are substantially the same as the drug delivery infusion apparatus 300 and the drug delivery infusion system of embodiment 2, but the difference is that the structure of the pushing head assembly 410 is added with some structures on the basis of the pushing head assembly 310 of embodiment 2.

Fig. 11 is a schematic structural diagram of a pusher head assembly 410 according to embodiment 3 of the present invention. Referring to fig. 10 and fig. 11 in combination with the related drawings of embodiments 1 and 2, in this embodiment, compared with the pusher assembly 310 of embodiment 2, the pusher assembly 410 further includes a locking assembly 430, the locking assembly 430 is slidably connected to a mounting seat 433 disposed on a side surface of the fixing member 131, the mounting seat 433 is fixed to the fixing member 131 and is provided with a sliding rail, so that the locking assembly 430 can move in a first preset direction relative to the fixing member 131. The mounting seat 433 of the fixing member 131 is provided with a pressure strain gauge 434, and the pressure strain gauge 434 can abut against the locking assembly 430 when the locking assembly 430 moves away from the first predetermined direction, so as to receive the pressure transmitted by the locking assembly 430. It should be noted that the amount of displacement of the locking assembly 430 relative to the stationary member 131 is much less than the amount of displacement that the pusher member 132 can undergo when unconstrained by the locking assembly 430.

The locking assembly 430 includes a locking portion that can be selectively fixedly coupled to the pusher 132 to achieve a fixed relative position of the locking assembly 430 to the pusher 132. In this embodiment, the locking part is a pin wheel 431, and a pin groove (not shown) is formed in a side surface of the pusher 132, and a pin on the pin wheel 431 can be selectively engaged with the pin groove, so that the locking assembly 430 and the pusher 132 are kept fixed. The locking assembly 430 further includes a fourth driving part 432 for driving the locking part, and the fourth driving part 432 may drive the pin wheel 431 to rotate so as to be engaged with or disengaged from the pusher 132. In this embodiment, the fourth driving portion 432 is fixedly disposed on a base, and the base is engaged with the slide rail of the mounting base 433 and can abut against the left pressure strain gauge 434. The pressure strain gauge 434 is electrically connected to a controller (not shown) electrically connected to the second driving portion 125 of the micro-feeding assembly 120, and the working principle thereof is similar to that of the pressure sensor 133 in embodiment 1, and will not be described herein again.

It can be understood that the pusher head assembly 410 of the present embodiment combines the two modes of the embodiment 1 and the embodiment 2, namely, the speed regulation control (embodiment 1) and the pressure regulation control (embodiment 2), and a technician can select and switch between the two modes as required, and when the speed regulation control mode is required, the locking assembly 430 is locked with the pushing member 132, at this time, the eccentric wheel mechanism fails, the whole device has the same operation mechanism as that of the embodiment 1, and the infusion rate is controlled by the propelling speed of the micro-feeding assembly 120; when a pressure-regulated control mode is desired, the contact lock assembly 430 engages the pusher 132 and the infusion rate is pressure-controlled, i.e., the same as in embodiment 2. When the two modes are switched, the device has the functions of improving the reliability of the device and increasing the adjustment range of the infusion flow. That is, the output flow rate of the pressure-regulated infusion mode may be set to a low-flow infusion mode, and the speed-regulated infusion mode may be set to a high-flow infusion mode. This facilitates the selection of different infusion rates by the technician on a case-by-case basis.

In summary, the pusher assembly of the present invention includes a fixing member fixed to the pusher base, a pushing member movably connected to the fixing member, and an eccentric wheel mechanism, wherein the pushing member is movable in a first predetermined direction relative to the fixing member; the pushing eccentric wheel mechanism is abutted against a limiting part arranged on the fixing piece, and a pressure sensor is arranged on one side of the limiting part, which faces the pushing piece. When the eccentric wheel of the eccentric wheel mechanism rotates, the large diameter of the eccentric wheel can be periodically abutted against the pressure sensor on the limiting part, and the second end of the pushing piece is connected with the eccentric wheel mechanism through a spring. Therefore, with the structure, the pressure sensor can periodically detect the pressure when the spring is compressed to the maximum extent, namely the pushing force of the pushing piece, when the peak value of the detected pressure is gradually reduced, the pushing head assembly can be pushed towards the first preset direction, so that the pressure is stabilized within a preset range again, and therefore the liquid medicine can be always extruded by the periodic pressure, and the peak value of the pressure can be stabilized within a preset range. Thus, stable supply of the chemical liquid is realized. When the eccentric continues to rotate and the peak pressure is constant, it means that a liquid blockage may occur. The structure is simple, stable and easy to realize, and the cost is lower.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A push head assembly is used for pushing and injecting liquid medicine and is characterized by comprising a fixing piece, a pushing piece and an eccentric wheel mechanism, wherein the fixing piece is fixed on a push head seat; the pushing piece is provided with a first end and a second end, the first end is used for abutting against a piston of the liquid medicine conveying device, the second end is abutted against a limiting part arranged on the fixing piece through the eccentric wheel mechanism, and a pressure sensor is arranged on one side of the limiting part facing the pushing piece;

the eccentric wheel mechanism comprises an eccentric wheel and a third driving part for driving the eccentric wheel to rotate, and the eccentric wheel mechanism can move in the first preset direction relative to the fixing piece; when the eccentric wheel rotates, the major diameter of the eccentric wheel can be periodically abutted against the pressure sensor on the limiting part, and the second end of the pushing piece is connected with the eccentric wheel mechanism through a spring.

2. The pusher head assembly of claim 1, wherein the eccentric mechanism further comprises a motor mount, the eccentric being rotatably coupled to the motor mount, the motor mount being movable relative to the fixed member in the first predetermined direction; one end of the spring is connected with the motor base.

3. The pusher head assembly of claim 2, wherein the stationary member is fixedly provided with a track base, the track base is provided with a track extending along the first predetermined direction, and the motor base is slidably connected to the track.

4. The pusher head assembly according to claim 3, wherein the limiting portion is a supporting plate disposed on the rail seat, and the pressure sensor is disposed on a side of the supporting plate facing the first predetermined direction.

5. The pusher head assembly of claim 1, wherein the second end of the pusher member is provided with a kidney-shaped aperture having a predetermined width in the first predetermined direction, and the fastener is movably linked to the pusher member by a stop bolt passing through the kidney-shaped aperture.

6. The pusher head assembly of claim 1, further comprising a locking assembly that is slidable in the first predetermined direction relative to the fixture; the fixing piece is provided with a pressure strain gauge, and the pressure strain gauge can abut against the locking assembly when the locking assembly moves back to the first preset direction; the locking assembly comprises a locking part which can be selectively fixedly connected with the pushing part so as to realize that the locking assembly and the pushing part keep a relative position to be fixed.

7. The pusher head assembly of claim 6, wherein the locking portion of the locking assembly is a pin wheel having a pin thereon, and the pusher member has a pin slot thereon; the pin can be selectively matched with the pin groove when the pin wheel rotates, so that the locking assembly and the pushing piece are relatively fixed.

8. A drug delivery infusion device, comprising a drive assembly and a pusher assembly as claimed in any one of claims 1 to 7, wherein the drive assembly is provided with the pusher base, the pusher assembly is provided with the pusher base, and the drive assembly is configured to drive the pusher base to move in the first predetermined direction.

9. The drug delivery infusion device of claim 8, wherein the drive assembly comprises:

the rapid feeding assembly comprises a base and a first driving mechanism arranged on the base, and the first driving mechanism comprises a first driving part;

the micro-feeding assembly comprises a base, a second driving part and a push head seat, wherein the base is in transmission connection with the first driving mechanism, the second driving part is arranged on the base, and the push head seat is in transmission connection with the second driving part;

the micro-feeding assembly can move along the first preset direction under the driving of the first driving mechanism, and the push head seat can move along the first preset direction under the driving of the second driving part.

10. A drug delivery infusion system comprising a drug delivery device according to claim 8 or 9 and a drug delivery device comprising a drug cartridge having a piston therein in sealing contact with an inner wall of the drug cartridge, the drug cartridge having an end provided with a throttle assembly in communication with the drug cartridge; the push head assembly is used for pushing the piston in the first preset direction.