CN116421818A - Injection pump - Google Patents

Abstract

The application discloses an injection pump, which comprises a shell, and a flexible transmission assembly and a motor assembly which are arranged in the shell; one side of the shell along the length direction is provided with an accommodating space; the accommodating space is used for accommodating the medicament bottle; the flexible transmission assembly comprises an annular track, a flexible push rod, a sliding assembly and a transmission shaft; one end of the annular track is arranged opposite to the accommodating space; the flexible push rod is arranged in the annular track; the transmission shaft and the motor component are arranged in an inner cavity formed by surrounding the annular track, and the transmission shaft is connected with the motor component; one end of the sliding component is fixedly connected with the flexible push rod, and the other end of the sliding component is in transmission connection with the transmission shaft; the motor assembly is driven to rotate when being excited, and the sliding assembly is driven to do linear motion when the transmission shaft rotates, so that the flexible push rod is driven to move along the annular track through the sliding assembly. The device can realize accurate transmission control and miniaturization of the injection pump, thereby improving portability of the injection pump.

Description

Injection pump

Technical Field

The present application relates to the field of medical devices, and in particular to a syringe pump.

Background

A syringe pump is a device for pushing a piston of a syringe to uniformly and continuously pump a medical fluid into a human body.

In the prior art, the injection pump generally comprises a propulsion component, a transmission component and the like, and the principle is that a motor drives a screw rod to rotate through a speed reducer, the screw rod drives a nut meshed with the screw rod to axially linearly move along the screw rod, and the nut is connected with the propulsion component through a connecting device, so that the propulsion component is driven by the nut to simultaneously axially linearly move along the screw rod, and a piston rod of the injector is pushed to realize injection of medicines to a human body.

However, the parts of the screw rod and the propulsion assembly in the existing injection pump are numerous, the structure is complex, the size is large, a large installation space is required to be occupied in the shell of the injection pump, the miniaturization of the injection pump is not facilitated, and the injection pump is inconvenient to carry or even cannot be carried.

Disclosure of Invention

The technical problem that this application mainly solves is to provide a syringe pump, can solve the unable miniaturized problem that current syringe pump structure complicacy leads to.

In order to solve the technical problems, a first technical scheme adopted by the application is to provide an injection pump, which comprises a shell, and a flexible transmission assembly and a motor assembly which are arranged in the shell; one side of the shell along the length direction is provided with an accommodating space; wherein the accommodating space is used for accommodating the medicament bottle; the flexible transmission assembly comprises an annular track, a flexible push rod, a sliding assembly and a transmission shaft; one end of the annular track is arranged opposite to the accommodating space; the flexible push rod is arranged in the annular track; the transmission shaft and the motor component are arranged in an inner cavity formed by surrounding the annular track, and the transmission shaft is connected with the motor component; one end of the sliding component is fixedly connected with the flexible push rod, and the other end of the sliding component is in transmission connection with the transmission shaft; the motor assembly is driven to rotate when being excited, and the sliding assembly is driven to do linear motion when the transmission shaft rotates, so that the flexible push rod is driven to move along the annular track through the sliding assembly.

The flexible transmission assembly further comprises a gear transmission assembly which is respectively connected with the transmission shaft and the motor assembly, and the gear transmission assembly is arranged opposite to a driving gear of the motor assembly; when the motor assembly is excited, the gear transmission assembly is driven to rotate, so that the gear transmission assembly drives the transmission shaft to rotate.

The gear transmission assembly comprises a gear fixing piece, a first gear and a second gear which are arranged on the gear fixing piece and meshed with each other; the gear fixing piece comprises a first plate body and a second plate body which are mutually perpendicular, one side surface of the first plate body is fixed on the shell, and the second plate body is perpendicular to the shell; the second plate body is provided with a positioning hole and a positioning column, the positioning column is close to the first plate body, and the positioning hole is arranged at one side of the positioning column far away from the first plate body; the first gear comprises a gear body and a positioning cylinder connected with the gear body, and the positioning cylinder is embedded into the positioning hole so as to fix the first gear on the second plate body; the center of the gear body is provided with a shaft hole to be matched with one end of the transmission shaft in a positioning way; the second gear is hollow ring-shaped, is sleeved on the periphery of the positioning column, and is meshed with the driving gear of the motor assembly.

The annular track of the flexible transmission assembly comprises an arc-shaped section and a first straight-line section and a second straight-line section which are connected with the arc-shaped section; the arc-shaped section is arranged at one end of the shell far away from the accommodating space, and the first straight line section and the second straight line section are respectively arranged on two sides of the shell along the length direction; one end of the first straight line segment, which is far away from the arc segment, is arranged opposite to the accommodating space; and linear sliding rails are arranged on two sides of the second straight line section.

A fixing frame is arranged between the first straight line section and the second straight line section, and the fixing frame is perpendicular to the first straight line section and the second straight line section; wherein, be provided with first through-hole on the mount, the transmission shaft is kept away from motor assembly's one end and wears to establish first through-hole to rotatable coupling with the mount.

The flexible transmission assembly further comprises a guide rod, and the guide rod is arranged between the transmission shaft and the second straight line section and is parallel to the transmission shaft; the first end of the guide rod is fixedly connected with a second through hole arranged in the fixing frame, and the second end of the guide rod is in sliding connection with the sliding assembly.

The first end of the sliding component is provided with a linear sliding block, and the linear sliding block is arranged on the linear sliding rail and is in sliding fit with the linear sliding rail; the linear slide block is provided with a semicircular through hole which is used for being sleeved on the periphery of the flexible push rod so as to be fixedly connected with the flexible push rod; the second end of the sliding component is provided with a first hole which is used for being sleeved on the periphery of the transmission shaft; wherein, the first hole is internally provided with an internal thread; the sliding assembly further comprises a second hole, wherein the second hole is arranged between the linear sliding block and the first hole and is used for being sleeved at the second end of the guide rod.

The first end of the transmission shaft is provided with a first cylinder, and the first cylinder is used for penetrating through a first through hole on the fixing frame so as to be rotatably connected with the fixing frame; the second end of the transmission shaft is provided with a second column which is used for being inserted into the shaft hole of the first gear so as to rotate synchronously with the first gear; the transmission shaft is provided with external threads on the shaft body between the first cylinder and the second cylinder, and the external threads are used for being matched with internal threads in the sliding assembly to realize threaded transmission.

Wherein the syringe pump further comprises a controller and a battery assembly; the controller and the battery assembly are arranged in the shell, the battery assembly is opposite to the accommodating space and is positioned at the other side of the shell along the length direction, and the controller is arranged between the annular track and the motor assembly; the battery assembly is used for supplying power to the controller so that the controller is electrically connected with the motor assembly and controls the motor assembly to rotate.

The injection pump is used for being matched with the needle tube pushing seat; the needle tube pushing seat is arranged outside the shell and is opposite to one end of the shell, which is close to the accommodating space.

The beneficial effects of this application are: in order to solve the problem, the utility model provides a flexible drive assembly's installation space can be reduced to the flexible push rod setting in the annular track through setting up the annular track in the casing and setting up the flexible push rod in the annular track, in the inner chamber that surrounds the annular track with the transmission shaft simultaneously to make the overall structure in the casing compacter. Further, the motor assembly is connected through the transmission shaft, the transmission shaft and the flexible push rod are respectively connected in a rotating mode through the sliding assembly, the sliding assembly can be driven to do linear motion along the transmission shaft when the transmission shaft is driven to rotate by the motor assembly, and therefore the flexible push rod fixedly connected with the sliding assembly moves along the annular track, and then the piston in the medicament bottle is pushed to achieve injection of medicaments. The injection pump of this application simple structure, cooperation are exquisite, the reliability is high, not only can realize accurate transmission control, can also realize the miniaturization of injection pump to improve the portability of injection pump, enlarge the application scenario of injection pump then.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a mating structure of an embodiment of a syringe pump and a needle cannula hub of the present application;

FIG. 2 is a schematic perspective view of an embodiment of the syringe pump of FIG. 1;

FIG. 3 is a schematic cross-sectional view of an embodiment of the syringe pump of FIG. 1;

FIG. 4 is a schematic view of the mounting structure of the battery assembly, motor assembly and controller of FIG. 3;

FIG. 5 is a schematic illustration of the flexible drive assembly of FIG. 3;

FIG. 6 is a schematic exploded view of the flexible drive assembly of FIG. 5;

FIG. 7 is a schematic illustration of the gear assembly of FIG. 6;

FIG. 8 is a schematic illustration of a specific configuration of the endless track of FIG. 6;

FIG. 9 is a schematic illustration of a specific construction of the annular track cover plate of FIG. 6;

FIG. 10 is a schematic illustration of a specific construction of the putter head of FIG. 6;

FIG. 11 is a schematic illustration of the slide assembly of FIG. 6;

FIG. 12 is a schematic illustration of the specific configuration of the drive shaft of FIG. 6;

FIG. 13 is an assembled schematic view of the flexible drive assembly of FIG. 5;

fig. 14 is a drive schematic of the flexible drive assembly of fig. 5.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The application provides a syringe pump, can solve the problem that current syringe pump structure complicacy leads to can't miniaturized carrying.

The injection pump comprises a shell, and a flexible transmission assembly and a motor assembly which are arranged in the shell; one side of the shell along the length direction is provided with an accommodating space; wherein the accommodating space is used for accommodating the medicament bottle; the flexible transmission assembly comprises an annular track, a flexible push rod, a sliding assembly and a transmission shaft; one end of the annular track is arranged opposite to the accommodating space; the flexible push rod is arranged in the annular track; the transmission shaft and the motor component are arranged in an inner cavity formed by surrounding the annular track, and the transmission shaft is connected with the motor component; one end of the sliding component is fixedly connected with the flexible push rod, and the other end of the sliding component is in transmission connection with the transmission shaft; the motor assembly is driven to rotate when being excited, and the sliding assembly is driven to do linear motion when the transmission shaft rotates, so that the flexible push rod is driven to move along the annular track through the sliding assembly. Through set up the annular rail in the casing and set up flexible push rod in the annular rail, set up the transmission shaft in the inner chamber that the annular rail surrounds simultaneously, can reduce flexible drive assembly's installation space, and then through flexible drive assembly and motor assembly's concrete cooperation relation, can realize the miniaturization of syringe pump under the circumstances of realizing accurate transmission control to improve the portability of syringe pump, enlarge the application scenario of syringe pump then.

For the description of the specific structure of the syringe pump of the present application, please refer to fig. 1, 2 and 3, fig. 1 is a schematic diagram of the cooperation structure of an embodiment of the syringe pump and the needle pushing seat of the present application, fig. 2 is a schematic diagram of the perspective structure of an embodiment of the syringe pump of fig. 1, and fig. 3 is a schematic diagram of the cross-sectional structure of an embodiment of the syringe pump of fig. 1.

In the present embodiment, the syringe pump 1 is used in cooperation with the needle pushing base 2, and the syringe pump 1 and the needle pushing base 2 are connected by a medicine bottle accommodated in the syringe pump 1.

The syringe pump 1 comprises a housing, a flexible transmission assembly 18 and a motor assembly 16 which are arranged in the housing. The housing is provided with accommodation space 20 on one side along the length direction, and accommodation space 20 is used for holding the medicament bottle. The needle tube pushing seat 2 is arranged outside the shell and is opposite to one end of the shell, which is close to the accommodating space 20.

Wherein the flexible drive assembly 18 comprises an annular track and the motor assembly 16 is disposed within an interior cavity defined by the annular track.

Specifically, one end of the flexible transmission assembly 18 is disposed opposite to the accommodating space 20, and when the motor assembly 16 is excited, the flexible transmission assembly 18 is driven to perform linear motion, so that the flexible transmission assembly 18 extends into the accommodating space 20, contacts the medicament bottle and pushes the piston in the medicament bottle to move, and thereby the medicament liquid is injected into the human body.

In some embodiments, the housing includes a first housing 10 and a second housing 12 that are connected to each other. The first housing 10 is provided on one side in the length direction with a receiving space 20, wherein the receiving space 20 is for receiving a medicine bottle.

In some embodiments, the medicament vial comprises a cartridge vial and the receiving space 20 is a cartridge injection rack. The clip-type bottle is similar to a syringe without a push rod, the front part of the bottle is provided with a rubber seal protection syringe needle, the bottle mouth is sealed by a rubber plug aluminum cover, and the tail part is sealed by a rubber piston. The card type bottle is placed into a reusable card type injection rack or an injection pen for use, and the liquid medicine is not contacted with other devices in the use process. In some embodiments, the medicament bottle may be 2-10mm in gauge.

It will be appreciated that by using a cartridge as a medicament vial for injection, transfer of the medicament can be avoided, thereby effectively reducing the risk of medicament infection.

In some embodiments, a through hole 30 is formed at one end of the first housing 10 and the second housing 12 near the accommodating space 20, and the needle tube pushing seat 2 is disposed facing the through hole 30. When the flexible transmission assembly 18 pushes the piston in the medicine bottle to move, the injection needle of the medicine bottle, which is close to the through hole 30, is connected with the needle tube pushing seat 2, and the injection needle penetrates through the needle tube pushing seat 2 to penetrate into the human body, so that the medicine is injected into the human body.

In some embodiments, the first housing 10 further includes a first viewing window 11 and the second housing 12 further includes a second viewing window 14. As shown in fig. 2, the first window 11 is disposed on the surface of the first housing 10 and opposite to the accommodating space 20, and the second window 14 is disposed on the side surface of the second housing 12 connected to the first housing 10 and opposite to the accommodating space 20. Wherein, the materials of the first window 11 and the second window 14 are transparent materials. It will be appreciated that the condition of the medicament bottle in the accommodating space 20 can be observed through the first window 11 or the second window 14, so that the injection condition of the medicament can be known.

In some embodiments, with continued reference to fig. 3, the syringe pump 1 further includes a controller 17 and a battery assembly 15. The controller 17 and the battery assembly 14 are both arranged in the housing, the battery assembly 15 is opposite to the accommodating space 20 and is positioned at the other side of the housing along the length direction, and the controller 17 is arranged between the annular track and the motor assembly 16. The battery assembly 15 is used for supplying power to the controller 17, so that the controller 17 is electrically connected with the motor assembly 16 and controls the motor assembly 16 to rotate. With continued reference to fig. 2, the surface of the second housing 12 is provided with a battery cover 13, the battery cover 13 is disposed opposite to the battery assembly 15 in the housing, and the battery assembly 15 can be replaced by opening the battery cover 13. It will be appreciated that the use of the battery assembly 15 to power the controller 17 and motor assembly 16 not only provides a steady power but also reduces the difficulty of operation and thus increases the convenience of the syringe pump 1.

Referring specifically to fig. 4, fig. 4 is a schematic diagram illustrating the installation structure of the battery assembly, the motor assembly and the controller in fig. 3. The battery assembly 15, the motor assembly 16 and the controller 17 are all fixed to the first housing 10. The battery assembly 15 includes positive and negative electrode reeds. The motor assembly 16 is provided with a driving gear 161 at one end near the battery assembly 15 for transmitting the motor output torque, and a rotary encoder 162 is integrated at one end of the motor assembly 16 near the controller 17 for counting the number of motor rotations. The edge of the controller 17 is provided with 3 fixing columns 101, and the controller 17 is fixed on the first housing 10 after the fixing columns 101 are hot-melted.

The rotation speed of the motor assembly 16 can be controlled by a programmed program recorded on the controller 17. It will be appreciated that by providing different motor speeds, the speed at which the flexible drive assembly 18 pushes the piston in the vial can be controlled, thereby setting the rate of injection of the medicament to be suitable for absorption by the human body and thus reducing discomfort to the patient.

Wherein, when injection is performed, the rotation number is calculated by the rotary encoder 162 integrated in the motor assembly 16, and after the rotation number reaches the preset number, the injection of the liquid medicine is completed, the controller 17 can control the motor assembly 16 to automatically rotate reversely, and the injection pump 1 is retracted to the initial position. Wherein, after the injection is finished, the user is required to manually pull out the needle head which is penetrated into the body.

It will be appreciated that by the cooperation of the controller 17, motor assembly 16 and flexible drive assembly 18, precise control of rotation to displacement can be achieved.

Further, referring to fig. 5 and 6, fig. 5 is a schematic structural diagram of the flexible transmission assembly in fig. 3, and fig. 6 is an exploded structural diagram of the flexible transmission assembly in fig. 5.

In this embodiment, the flexible drive assembly 18 includes an annular track 181, a flexible pushrod 185, a sliding assembly 184, and a drive shaft 187. Wherein, the one end of annular rail 181 sets up with accommodation space 20 relatively, and flexible push rod 185 sets up in annular rail 181, and transmission shaft 187 sets up in the inner chamber that annular rail 181 surrounds the formation, and transmission shaft 187 is connected with motor assembly 16. One end of the sliding component 184 is fixedly connected with the flexible push rod 185, and the other end is in transmission connection with the transmission shaft 187.

When the motor assembly 16 is activated, the driving shaft 187 is driven to rotate, and when the driving shaft 187 rotates, the sliding assembly 184 is driven to do linear motion, so that the sliding assembly 184 drives the flexible push rod 185 to move along the circular track 181.

It will be appreciated that by arranging the annular rail 181 in the housing and arranging the flexible push rod 185 in the annular rail 181, and simultaneously arranging the transmission shaft 187 in the inner cavity surrounded by the annular rail 181, the installation space of the flexible transmission assembly 18 can be reduced, so that the overall structure in the housing is more compact, thereby realizing miniaturization of the syringe pump 1 and facilitating carrying thereof.

Further, the motor assembly 16 is connected through the transmission shaft 187, and the transmission shaft 187 and the flexible push rod 185 are respectively and rotatably connected through the sliding assembly 184, so that the sliding assembly 184 can be driven to do linear motion along the transmission shaft 187 when the transmission shaft 187 is driven to rotate by the motor assembly 16, and the flexible push rod 185 fixedly connected with the sliding assembly 184 can move along the annular track 181, so that the piston in the medicament bottle is pushed to achieve injection of medicament.

In some embodiments, flexible drive assembly 18 further includes a gear drive assembly that connects drive shaft 187 to motor assembly 16, respectively, and is disposed opposite drive gear 161 of motor assembly 16. Wherein the motor assembly 16, when energized, drives the gear assembly in rotation such that the gear assembly drives the drive shaft 187 in rotation.

In some embodiments, the gear assembly includes a gear mount 182, and first and second gears 188, 183 disposed on the gear mount 182 that intermesh. Referring to fig. 7 in combination, fig. 7 is a schematic diagram showing a specific structure of the gear fixing member in fig. 6. The gear fixing member 182 includes a first plate 1825 and a second plate 1826 perpendicular to each other, one side surface of the first plate 1825 is fixed on the first housing 10, and the second plate 1826 is perpendicular to the first housing. Wherein, the first plate 1825 is provided with at least one screw hole 1821 for locking connection with the first housing 10 by a screw. The second plate 1826 is provided with a positioning hole 1822 and a positioning column 1824, the positioning column 1824 is disposed near the first plate 1825, and the positioning hole 1822 is disposed at one side of the positioning column 1824 far away from the first plate 1825. The first gear 188 includes a gear body and a positioning cylinder connected to the gear body, the positioning cylinder is embedded into the positioning hole 1822 to fix the first gear 188 on the second plate 1826, and a shaft hole is disposed at a central position of the gear body to be in positioning fit with one end of the transmission shaft 187. The second gear 183 is hollow and annular, is sleeved on the periphery of the positioning column 1824, and is meshed with the driving gear 161 of the motor assembly 16. In some embodiments, the second plate 1826 of the gear fixing member 182 further includes a fixing hole 1823 for being sleeved on the periphery of the guide rod 186.

In the above embodiments, the number of the reduction gears in the gear assembly is 2, and in some other embodiments, the number of the reduction gears in the gear assembly may be 3, 4 or more, or may be a gear set, which is not limited in this application.

It will be appreciated that by providing a different number of reduction gears between the motor assembly 16 and the drive shaft 187, a suitable gear reduction ratio may be achieved to achieve different thrust forces to accomplish drug injections of different viscosities.

It can be appreciated that, through the specific matching relationship between the flexible transmission assembly 18 and the motor assembly 16, the miniaturization of the syringe pump 1 can be realized under the condition of realizing precise transmission control, so that the portability of the syringe pump 1 is improved, and the application scene of the syringe pump 1 is enlarged.

Referring to fig. 8, fig. 8 is a schematic diagram showing a specific structure of the circular track in fig. 6. In some embodiments, the annular rail 181 includes an arcuate segment 1811 and first and second linear segments 1812 and 1813 connected to the arcuate segment. The arc-shaped section 1811 is disposed at an end of the first housing 10 away from the accommodating space 20, and the first straight line section 1812 and the second straight line section 1813 are respectively disposed on two sides of the housing along the length direction. One end of the first straight line segment 1812 far away from the arc segment 1811 is opposite to the accommodating space 20, and two sides of the second straight line segment 1813 are provided with linear sliding rails.

In some embodiments, a fixing frame 1816 is disposed between the first straight line segment 1812 and the second straight line segment 1813, and the fixing frame 1816 is perpendicular to the first straight line segment 1812 and the second straight line segment 1813. One end of the fixing frame 1816 is fixed at the connection position of the first straight line segment 1812 and the arc segment, and the other end is fixed at the connection position of the second straight line segment 1813 and the arc segment. The fixing frame 1816 is provided with a first through hole 1814, and one end of the transmission shaft 187 away from the motor assembly 16 is penetrated through the first through hole 1814 so as to be rotatably connected with the fixing frame 1816. In some embodiments, a bearing may be further provided in the first through hole 1814 to make the rotation of the transmission shaft 187 smoother.

In some embodiments, the flexible drive assembly 18 further includes a guide bar 186, the guide bar 186 being disposed between the drive shaft 187 and the second straight section 1813 and parallel to the drive shaft 187. Wherein, the first end of the guiding rod 186 is fixedly connected with a second through hole 1815 arranged in the fixing frame 1816, and the second end of the guiding rod 186 is slidably connected with the sliding component 184. In some embodiments, after the first end of the guide rod 186 passes through the second through hole 1815, the guide rod 186 may be locked in the second through hole 1815 by a screw to ensure stable and reliable guiding. In some embodiments, the second end of the guide rod 186 is threaded through a securing hole 1823 in the gear mount 182 to lock the second end of the guide rod 186 in the securing hole 1823.

In some embodiments, a support bracket 1817 is further disposed between the first straight line segment 1812 and the second straight line segment 1813. The support frame 1817 is arranged in parallel with the fixing frame 1816, and a groove is formed in the support frame 1817 and used for supporting the transmission shaft 187 so as to ensure the overall strength of the part.

It will be appreciated that the guide rods 186 and support brackets 1817 can enhance the stability of the flexible drive assembly 18, thereby enhancing the stability of the flexible push rod 185 as it moves.

In some embodiments, a plurality of bosses 1810 are further provided at the edge of the annular rail 181, and a through hole is provided in the middle of the boss 1810 for locking connection with the first housing 10 by a screw.

In some embodiments, stepped slots 1818 are also designed at the edges of the annular rail 181 for mating with the annular rail cover plate 180. Referring to fig. 9, fig. 9 is a schematic diagram of a specific structure of the annular track cover plate in fig. 6. The circular rail cover 180 covers only the arc-shaped section 1811 and the first straight-line section 1812 of the circular rail 181, exposing the second straight-line section 1813, so that the sliding assembly 184 can slide along the linear rails disposed at both sides of the second straight-line section 1813. The edge of the annular track cover plate 180 is provided with a plurality of notches 1801, and the notches 1801 are used for assisting alignment during installation. The surface of the annular rail cover plate 180 contacting the annular rail 181 is provided with projections 1802 on both sides for engagement with stepped grooves 1818 of the annular rail 181.

In some embodiments, the flexible push rod 185 is a tension spring that facilitates bending and recovery and is capable of transmitting forces in an axial direction. The flexible push rod 185 may be made of 304 or 316 stainless steel, which is not limited in this application.

In some embodiments, the flexible push rod 185 has an overall length of 110mm. Taking 3.0ml as an example of the cassette bottle accommodated in the accommodating space 20, the stroke for pushing the cassette bottle needs 42mm, and the length of the flexible push rod 185 meets the use requirement.

It will be appreciated that by adjusting the overall length of the flexible push rod 185, different sizes of cartridge vials may be pushed to accomplish different doses of medication.

It will be appreciated that the use of the flexible push rod 185 in place of the existing lead screw or other propulsion assembly can reduce the weight of the parts and make the syringe pump 1 easier to carry.

In some embodiments, the end of the flexible push rod 185 that contacts the vial is provided with a push rod head 189. Referring to fig. 10, fig. 10 is a schematic diagram illustrating a specific structure of the putter head of fig. 6. The pusher head 189 has a hollow ring shape, and the inner ring 1891 is used for forming an interference fit with the flexible pusher 185, and the contact surface between the flexible pusher 185 and the inner ring 1891 under the interference fit generates elastic pressure, so that the flexible pusher 185 and the pusher head 189 can be tightly coupled in the assembled state. The outer ring of the pusher head 189 is provided with a plurality of rib features 1892 for preventing shrinkage of the pusher head 189 during injection molding.

Referring to fig. 11 in combination, fig. 11 is a schematic view of the sliding assembly shown in fig. 6. In some embodiments, the first end of the sliding assembly 184 is provided with a linear slide 1842, and the linear slide 1842 is mounted on and slidably engaged with the linear slide on both sides of the second linear section 1813. The linear slider 1842 is provided with a semicircular through hole 1841, which is used for being sleeved on the periphery of the flexible push rod 185 to be fixedly connected with the flexible push rod 185. The second end of the slip assembly 184 is provided with a first bore 1844 for nesting around the periphery of the drive shaft 187, wherein the first bore 1844 is internally provided with internal threads. The slide assembly 184 further includes a second bore 1843 disposed between the linear slide 1842 and the first bore 1844 for nesting at a second end of the guide rod 186. In a particular embodiment, the diameter of the semi-circular through hole 1841 may be 3.0±0.5mm and the pitch of the internal threads inside the first hole 1844 may be set to 0.8mm.

Referring to fig. 12 in combination, fig. 12 is a schematic diagram of the specific structure of the transmission shaft in fig. 6. In some embodiments, a first end of the drive shaft 187 is provided with a first post 1874, the first post 1874 being configured to pass through a first through hole 1814 in the mount 1816 to rotatably connect with the mount 1816. The second end of the transmission shaft 187 is provided with a second post 1871, and the second post 1871 is configured to be inserted into the shaft hole of the first gear 188 to rotate in synchronization with the first gear 188. Wherein, drive shaft 187 is provided with external threads 1873 on the shaft body between first cylinder 1874 and second cylinder 1871, and external threads 1873 are used for cooperating with the internal threads in sliding assembly 184 to realize the screw drive. In some embodiments, a shoulder 1872 is further provided at an end of the shaft adjacent to the second post 1871, the shoulder 1872 being configured to mechanically retain the slide assembly 184.

The parts in the above embodiments, except the flexible push rod 185, may be manufactured by injection molding, machining, wire cutting, etc., and the assembly may be achieved by bonding, welding or snap-fitting. In some embodiments, a polymer material such as PC (polycarbonate), PA (polyamide) or the like may be injection molded or machined to prepare the first housing 10 and the second housing 12. The components of the motor assembly 16 may be injection molded from a polymer material such as POM (polyoxymethylene) or PEEK (polyether ether ketone).

To further illustrate the assembly process of the flexible drive assembly of the present application, please refer to fig. 13, fig. 13 being a schematic diagram of the assembly of the flexible drive assembly of fig. 5.

In some embodiments, the annular rail 181 is first fixed on the first housing 10, and then the semicircular through hole 1841 of the linear slider 1842 of the sliding component 184 is sleeved on the periphery of the flexible push rod 185, and after the two are bonded to form a fixed connection between the sliding component 184 and the flexible push rod 185, the flexible push rod 185 is placed in the annular rail 181. The guide rod 186 is then inserted through the second hole 1843 of the sliding component 184 and the second through hole 1815 of the fixing frame 1816, and the guide rod 186 is locked in the second through hole 1815 by a screw, so as to mechanically limit the guide rod 186. Further, the transmission shaft 187 is inserted through the first hole 1844 of the sliding component 184 and the first through hole 1814 of the fixing frame 1816 to position the transmission shaft 187. The positioning cylinder of the first gear 188 is embedded into the positioning hole 1822 of the gear fixing piece 182 again, and meanwhile, the second gear 183 is sleeved on the periphery of the positioning column 1824 of the gear fixing piece 182, so that the assembly of the gear transmission assembly is realized, and the second cylinder 1871 of the transmission shaft 187 is inserted into the shaft hole of the first gear 188. The pusher head 189 is then bonded to the end of the flexible pusher 185 remote from the sliding assembly 184, and finally the annular rail cover 180 is bonded to the annular rail 181 to complete the assembly of the flexible drive assembly 18.

It can be appreciated that the above components are simple in design and fit, simple in manufacturing and assembling process, and capable of mass production.

Further, referring to fig. 14, fig. 14 is a schematic diagram of the flexible transmission assembly of fig. 5. When the motor assembly 16 is excited, the second gear 183 and the first gear 188 are driven to rotate, and when the first gear 188 rotates, the transmission shaft 187 is driven to rotate, so that the transmission shaft 187 and the sliding assembly 184 realize threaded transmission, and the sliding assembly 184 moves linearly along the second linear section 1813, and then the flexible push rod 185 is driven to move along the annular track 181, so that the flexible push rod 185 moves from the initial position to contact with the medicament bottle and completes pushing action of injection. Upon reset, the motor assembly 16 reverses to move the flexible push rod 185 in a reverse direction along the annular rail 181 until it returns to the original position.

In some embodiments, the rotary encoder 162 integrated in the motor assembly 16 calculates the number of rotations, and after the number of rotations reaches a preset number of rotations, the controller may control the motor assembly 16 to automatically reverse, and the syringe pump 1 is retracted to the initial position. Wherein, after the injection is finished, the user is required to manually pull out the needle head which is penetrated into the body.

The syringe pump 1 in the above embodiment can be used for subcutaneous injection, intradermal injection, intramuscular injection, and the like, and is not limited to this.

The syringe pump 1 in the above embodiment is suitable for injection of proprotein convertase subtilisin 9 drug (PCSK 9), and can also be used for injection of the remaining drugs.

The syringe pump 1 of the above embodiment can be repeatedly used, and only the medicine bottle in the accommodating space 20 needs to be replaced before each use.

In contrast to the prior art, this application is through setting up the annular rail in the casing and setting up flexible push rod in the annular rail, sets up the transmission shaft in the inner chamber that the annular rail surrounds simultaneously, can reduce flexible drive assembly's installation space to make the overall structure in the casing compacter. Further, the motor assembly is connected through the transmission shaft, the transmission shaft and the flexible push rod are respectively connected in a rotating mode through the sliding assembly, the sliding assembly can be driven to do linear motion along the transmission shaft when the transmission shaft is driven to rotate by the motor assembly, and therefore the flexible push rod fixedly connected with the sliding assembly moves along the annular track, and then the piston in the medicament bottle is pushed to achieve injection of medicaments. The injection pump of this application simple structure, cooperation are exquisite, the reliability is high, not only can realize accurate transmission control, can also realize the miniaturization of injection pump to improve the portability of injection pump, enlarge the application scenario of injection pump then.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (10)

1. The injection pump is characterized by comprising a shell, and a flexible transmission assembly and a motor assembly which are arranged in the shell;

one side of the shell along the length direction is provided with an accommodating space; wherein the accommodating space is used for accommodating the medicament bottle;

the flexible transmission assembly comprises an annular track, a flexible push rod, a sliding assembly and a transmission shaft; one end of the annular track is arranged opposite to the accommodating space; the flexible push rod is arranged in the annular track; the transmission shaft and the motor assembly are arranged in an inner cavity formed by surrounding the annular track, and the transmission shaft is connected with the motor assembly; one end of the sliding component is fixedly connected with the flexible push rod, and the other end of the sliding component is in transmission connection with the transmission shaft;

the motor assembly is driven to rotate when being excited, and the sliding assembly is driven to do linear motion when the transmission shaft rotates, so that the flexible push rod is driven to move along the annular track through the sliding assembly.

2. The syringe pump of claim 1, wherein the syringe pump is configured to,

the flexible transmission assembly further comprises a gear transmission assembly which is respectively connected with the transmission shaft and the motor assembly, and the gear transmission assembly is arranged opposite to a driving gear of the motor assembly;

and when the motor assembly is excited, the gear transmission assembly is driven to rotate, so that the gear transmission assembly drives the transmission shaft to rotate.

3. The syringe pump of claim 2, wherein the syringe pump is configured to,

the gear transmission assembly comprises a gear fixing piece, and a first gear and a second gear which are mutually meshed and arranged on the gear fixing piece; the gear fixing piece comprises a first plate body and a second plate body which are mutually perpendicular, one side surface of the first plate body is fixed on the shell, and the second plate body is perpendicular to the shell; the second plate body is provided with a positioning hole and a positioning column, the positioning column is arranged close to the first plate body, and the positioning hole is arranged on one side of the positioning column away from the first plate body;

the first gear comprises a gear body and a positioning cylinder connected with the gear body, and the positioning cylinder is embedded into the positioning hole so as to fix the first gear on the second plate body; the center of the gear body is provided with a shaft hole to be matched with one end of the transmission shaft in a positioning way; the second gear is hollow and annular, sleeved on the periphery of the positioning column and meshed with the driving gear of the motor assembly.

4. The syringe pump of claim 3, wherein the syringe pump is configured to,

the annular track of the flexible transmission assembly comprises an arc-shaped section and a first straight-line section and a second straight-line section which are connected with the arc-shaped section; the arc-shaped section is arranged at one end of the shell far away from the accommodating space, and the first straight line section and the second straight line section are respectively arranged on two sides of the shell along the length direction; one end of the first straight line segment, which is far away from the arc segment, is arranged opposite to the accommodating space; and linear sliding rails are arranged on two sides of the second straight line section.

5. The syringe pump of claim 4, wherein the syringe pump is configured to,

a fixing frame is arranged between the first straight line section and the second straight line section, and the fixing frame is perpendicular to the first straight line section and the second straight line section;

the motor assembly comprises a fixing frame, a transmission shaft, a motor assembly, a fixing frame, a first through hole, a transmission shaft, a first through hole and a second through hole, wherein the fixing frame is provided with the first through hole, and one end of the transmission shaft, which is far away from the motor assembly, penetrates through the first through hole so as to be rotatably connected with the fixing frame.

6. The syringe pump of claim 5, wherein the syringe pump is configured to,

the flexible transmission assembly further comprises a guide rod, wherein the guide rod is arranged between the transmission shaft and the second straight line section and is parallel to the transmission shaft;

the first end of the guide rod is fixedly connected with a second through hole formed in the fixing frame, and the second end of the guide rod is slidably connected with the sliding assembly.

7. The syringe pump of claim 6, wherein the syringe pump is configured to,

the first end of the sliding component is provided with a linear sliding block, and the linear sliding block is arranged on the linear sliding rail and is in sliding fit with the linear sliding rail; the linear sliding block is provided with a semicircular through hole which is sleeved on the periphery of the flexible push rod and fixedly connected with the flexible push rod;

the second end of the sliding component is provided with a first hole which is used for being sleeved on the periphery of the transmission shaft; wherein, the first hole is internally provided with an internal thread;

the sliding assembly further comprises a second hole, wherein the second hole is arranged between the linear sliding block and the first hole and is used for being sleeved at the second end of the guide rod.

8. The syringe pump of claim 7, wherein the syringe pump is configured to,

the first end of the transmission shaft is provided with a first column body which is used for penetrating the first through hole on the fixing frame so as to be rotatably connected with the fixing frame; the second end of the transmission shaft is provided with a second post which is used for being inserted into the shaft hole of the first gear so as to rotate synchronously with the first gear;

the transmission shaft is arranged on the shaft body between the first cylinder and the second cylinder, and the external threads are used for being matched with the internal threads in the sliding assembly to realize threaded transmission.

9. The syringe pump of claim 1, wherein the syringe pump is configured to,

the syringe pump further comprises a controller and a battery assembly;

the controller and the battery assembly are arranged in the shell, the battery assembly is opposite to the accommodating space and is positioned on the other side of the shell along the length direction, and the controller is arranged between the annular track and the motor assembly;

the battery assembly is used for supplying power to the controller, so that the controller is electrically connected with the motor assembly and controls the motor assembly to rotate.

10. The syringe pump of claim 1, wherein the syringe pump is configured to,

the injection pump is used for being matched with the needle tube pushing seat;

the needle tube pushing seat is arranged outside the shell and is opposite to one end of the shell, which is close to the accommodating space.

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