CN113546235A

CN113546235A - Infusion box of infusion apparatus, infusion apparatus and infusion pump

Info

Publication number: CN113546235A
Application number: CN202010330276.1A
Authority: CN
Inventors: 徐雄; 冯铁其; 刘忠辉
Original assignee: Changsha Maggil Medical Technology Co ltd
Current assignee: Changsha Maggil Medical Technology Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-10-26

Abstract

The embodiment of the application provides an infusion box of an infusion apparatus, the infusion apparatus and an infusion pump, wherein the infusion box is provided with a flow channel, the infusion box comprises a rigid assembly, an elastic membrane and a locking mechanism, the rigid assembly comprises a plurality of components which are arranged in a stacked mode, at least one component is provided with a groove, and the elastic membrane is arranged between every two adjacent components to cover the groove in a sealing mode; the locking mechanism comprises an installation frame and a liquid stopping plug fixedly arranged on the installation frame, the liquid stopping plug can extrude the elastic membrane to close the flow channel, the locking mechanism closes or opens the flow channel through the liquid stopping plug, and the installation frame is movably connected with the main body framework to enable the locking mechanism to be capable of switching between a closing state of closing the flow channel or an opening state of opening the flow channel. According to the infusion box, the rigid assembly and the elastic membrane belong to injection molding parts, so that the processing precision is high, the assembly is simple, and the assembly error is small; the possibility of unexpected displacement and swing of the elastic membrane is low; can prevent excessive transfusion and environmental hazard caused by liquid self-flowing.

Description

Infusion box of infusion apparatus, infusion apparatus and infusion pump

Technical Field

The application relates to the technical field of medical equipment, in particular to an infusion box of an infusion apparatus, an infusion apparatus and an infusion pump.

Background

In clinical practice, liquids often need to be infused into a patient in a very precise manner, in which case a gravity-based infusion device is often difficult to meet. Instead, the dosage and speed of the liquid are adjusted by the infusion pump to perform precise infusion. Therefore, in recent years, infusion pumps have become widely used, and various types of infusion pumps have come into the market, such as infusion pumps used for general infusion, portable analgesia infusion pumps used for analgesia, infusion pumps used for blood transfusion and chemotherapy, and the like.

In the related technology of the infusion pump, a pump body wriggles to press a tube of an infusion apparatus so as to control the flow of liquid in the infusion apparatus. Wherein, an infusion pump passes through wriggling piece and presses the flow of transfusion system PVC material transfer line in order to control the interior liquid of transfusion system according to the rigid extrusion of time sequence, and the PVC transfer line often exists by wriggling piece repeated extrusion and the risk of rupture weeping, and the whole size of this type of infusion pump is great relatively, and weight is heavy. In addition, there is an infusion pump which controls the flow of the liquid in the infusion set by pressing a flexible silicone tube provided in an infusion cassette of the infusion set in time sequence by a peristaltic finger. The two ends of the silicone tube are relatively fixed, and other parts between the two ends are approximately horizontally arranged along the extrusion plate and are in a relatively free state. Generally, when the peristaltic finger of the pump body wriggles, the silicone tube may be driven to randomly displace and swing, and the displacement and the swing have adverse effects on the infusion precision to a certain extent; meanwhile, when the silicone tube is assembled with the extrusion plate, the infusion precision can be changed due to the difference of the length of the silicone tube, the gap between the silicone tube and the extrusion plate and the like; in addition, the infusion pump puts forward higher requirements on the fit clearance between the peristaltic fingers of the pump body and the fixed holes of the peristaltic finger frames, if the clearance is larger, the peristaltic fingers can swing and cannot accurately extrude to the preset position of the silicone tube, and if the clearance is too small, the peristaltic fingers easily rub the fixed holes of the peristaltic finger frames, so that the service life of the pump head is influenced, and the moment of the peristaltic fingers is reduced.

Generally, the infusion tube of the infusion apparatus is communicated with the liquid container, and when the infusion box or the infusion tube is combined with the pump body, the peristaltic finger on the pump head can extrude the silicone tube in the PVC infusion tube or the infusion box to control the liquid in the infusion apparatus to flow freely. However, when the PVC infusion tube or the infusion cassette is separated from the pump body, if there is no liquid stopping device, the liquid in the infusion tube flows out freely under the action of gravity, and this self-flow is in an uncontrolled state, which has a great risk and inconvenience in some clinical application scenarios.

Disclosure of Invention

In view of the above, it is desirable to provide an infusion cassette of an infusion apparatus, an infusion apparatus and an infusion pump, which have higher precision and are convenient to manufacture.

To achieve the above object, a first aspect of embodiments of the present application provides an infusion cassette of an infusion set, the infusion cassette having a flow passage, the infusion cassette comprising:

a rigid assembly comprising a plurality of components arranged in a stack, at least one of the components having a recess formed therein;

the elastic membrane is arranged between two adjacent components to cover the groove in a sealing mode, and the elastic membrane and the groove jointly form at least one part of the flow channel;

locking mechanism, locking mechanism include the mounting bracket and fixed set up in end liquid stopper on the mounting bracket, end liquid stopper can extrude the elastic diaphragm is in order to close the runner, locking mechanism passes through end liquid stopper is closed or is opened the runner, the mounting bracket with main part framework swing joint is so that locking mechanism can be closing the closed condition of runner or open switch between the open condition of runner.

In some embodiments, the member comprises a first member, a second member, and a third member, the recess comprising a first recess and a second recess, the elastic membrane comprising a first elastic membrane and a second elastic membrane, the second member disposed between the first member and the third member, the second member having the first recess disposed on a side thereof facing the first member, the first elastic membrane disposed between the first member and the second member to sealingly cover the first recess; a second groove is formed on one side, away from the first member, of the second member; the second groove is communicated with the first groove and is positioned at the downstream of the first groove; the second elastic membrane is disposed between the second member and the third member to sealingly cover the second groove; the liquid stopping plug is arranged on one side, away from the second component, of the third component, and the liquid stopping plug extrudes the second elastic membrane to close the flow channel.

In some embodiments, the infusion cassette comprises a resilient member that exerts a force on the mounting frame to enable the latching mechanism to remain in a closed state closing the flow passage.

In some embodiments, the open state comprises a first open state in which the locking mechanism is held under an external force; when the external force disappears or the elastic force of the elastic piece can overcome the acting force of the external force on the locking mechanism, the elastic piece drives the locking mechanism to be automatically switched from the first open state to the closed state.

In some embodiments, the open state comprises a second open state, and the locking mechanism comprises a latch structure disposed on the mounting bracket; the latch structure is selectively lockingly engageable with the rigid assembly to lock the locking mechanism in the second open condition.

In some embodiments, the rigid member is provided with two through holes penetrating through the rigid member in a thickness direction of the rigid member, and the flow passage is located between the two through holes; the mounting bracket includes horizontal pole, connecting rod and slide bar, each all be provided with one in the through hole the slide bar, the connecting rod with the horizontal pole set up in the relative both sides of rigid component along thickness direction, two the first end of slide bar with the connecting rod is connected, two the second end of slide bar with the horizontal pole is connected, end the liquid stopper set up in on the horizontal pole.

In some embodiments, the cross bar is provided with two connecting holes, and the second end of the sliding rod is fixedly arranged in the connecting holes.

In some embodiments, a circumferential surface of the second end of the slide bar is provided with a step surface, and the cross bar abuts against the step surface.

In some embodiments, the latch structure protrudes from the surface of the sliding rod, and a sliding groove is formed on a wall surface corresponding to the through hole; a stopping part protruding towards the through hole is formed on the first component; when the sliding rod slides to a position where the latch structure does not interfere with the stopping portion, the locking mechanism can swing along the length direction of the infusion box, and the latch structure slides into the sliding groove edge and abuts against one side, facing the second member, of the stopping portion, so that the locking mechanism is locked in a second open state.

In some embodiments, the flow channel extends along a straight line in a projection perpendicular to a thickness direction of the infusion cassette.

A second aspect of the embodiment of the application provides an infusion pump, include the multistage transfer line and go up arbitrary infusion casket, the infusion casket has inlet and liquid outlet, one of them section the transfer line with the inlet is connected, one of them section the transfer line with the liquid outlet is connected, the transfer line with the runner intercommunication.

A third aspect of an embodiment of the present application provides an infusion pump including a pump body and any one of the infusion sets described above, wherein when the infusion cassette is combined with the pump body, the pump body can drive the lock mechanism to switch from a closed state to an open state and maintain the lock mechanism in the open state; when the infusion cassette is separated from the pump body, the locking mechanism can be automatically switched from the open state to the closed state.

According to the infusion box disclosed by the embodiment of the application, each component of the rigid assembly belongs to a rigid injection molding part, the elastic membrane belongs to a flexible injection molding part, and the injection molding part is high in production and processing precision, simple to assemble, small in assembly error and good in product consistency; in addition, the elastic membrane is arranged between the two adjacent components, and when the elastic membrane is extruded, the possibility of unexpected displacement and swing of the elastic membrane is very small; the locking mechanism selectively closes the flow channel, so that the liquid in the infusion box can be prevented from flowing automatically, and the damage to the environment caused by excessive infusion or dropping of liquid medicine due to the liquid flowing automatically is avoided; furthermore, the first elastic membrane has good extrusion resistance, so that the risk of damage and leakage caused by repeated extrusion is very low.

Drawings

FIG. 1 is a schematic view of an embodiment of an infusion cassette;

FIG. 2 is an exploded view of the structure shown in FIG. 1;

FIG. 3 is a schematic structural view of the second member shown in FIG. 1;

FIG. 4 is a schematic structural view of the locking mechanism shown in FIG. 1;

FIG. 5 is a cross-sectional view of the infusion cassette of FIG. 1;

FIG. 6 is a schematic view of an embodiment of the present application showing the pump body and the infusion cassette in a separated state;

fig. 7 is an assembled view of the infusion pump shown in fig. 6, with a portion of the structure in section.

Description of the reference numerals

A transfusion box 1; a rigid component 10; a first member 11; a second member 12; a third member 13; a first elastic diaphragm 14; a second elastic diaphragm 15; a stopper portion 110; a first hole 11 a; a second hole 11 b; a third hole 11 c; a fourth hole 11 d; a first groove 121; a second groove 122; an overflow aperture 122 a; the pump chamber 121 a; the first brake chamber 121 b; a second brake chamber 121 c; the pressure monitoring chamber 121 d; a flow channel 1 a; a liquid inlet 1 b; a liquid outlet 1 c; a through hole 1 d; a chute 1 f; a relief hole 13 a; a lock mechanism 16; a mounting frame 161; a connecting rod 1611; a cross-bar 1612; a slide bar 1613; a step surface 1613 a; a latch structure 1614; a liquid stop plug 162; a connection hole 1612 a; an elastic member 17; a pump body 2; a plunger assembly 21; a first brake cylinder assembly 22; a second brake cylinder assembly 23; a camshaft 24; a power unit 25; a motor 251; a transmission mechanism 252; a pressure monitoring device 26; an ultrasonic bubble monitoring device 27; a pump head frame 28; a boss 281; the inclined surface 281 a; transfusion tube 3

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

In the description of the embodiments of the present application, the "thickness direction", "length direction" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 5, it is to be understood that these orientation terms are merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present application.

An embodiment of the present application provides an infusion pump, please refer to fig. 6, the infusion pump includes a pump body 2 and an infusion apparatus.

The transfusion device comprises a transfusion box 1 and a multi-section transfusion tube 3 connected with the transfusion box 1. It will be appreciated that in some embodiments, the infusion set may also include other accessories disposed on the infusion tube 3.

Referring to fig. 5, the transfusion cassette 1 has a liquid inlet 1b, a liquid outlet 1c, and a flow channel 1a communicating with the liquid inlet 1b and the liquid outlet 1 c. One end of one section of the infusion tube 3 is connected with the liquid inlet 1b, one end of the other section of the infusion tube 3 is connected with the liquid outlet 1c, and the infusion tube 3 is communicated with the flow passage 1 a.

Referring to fig. 2, the infusion cassette 1 includes a rigid member 10 and an elastic membrane. The rigid assembly 10 comprises a plurality of components arranged in a stacked manner, wherein at least one component is provided with a groove; the elastic membrane is arranged between the two adjacent components to hermetically cover the groove, and the elastic membrane and the groove jointly form at least one part of the flow channel.

In the embodiment of the present application, based on the structural characteristics of the flow channel formed by the elastic membrane and the groove, the infusion cassette 1 further comprises a locking mechanism 16 to prevent the uncontrolled self-flow of the liquid in the infusion apparatus from causing excessive infusion or causing harm to the environment.

The locking mechanism 16 includes a mounting frame 161 and a liquid stop plug 162 fixedly disposed on the mounting frame 161, i.e., the mounting frame 161 and the liquid stop plug 162 move synchronously. The liquid stop plug 162 can press the elastic membrane 15 to close the flow passage 1a, the locking mechanism 16 can close or open the flow passage 1a through the liquid stop plug 162, and the mounting frame 161 is movably connected with the rigid assembly 10 to enable the locking mechanism 16 to be switched between a closed state of closing the flow passage 1a or an open state of opening the flow passage 1 a.

It should be noted that the locking mechanism 16 performs the function of closing or opening the flow passage 1a through the liquid stop plug 162, and the position of the liquid stop plug 162 can be changed by the movement of the mounting frame 161 relative to the main frame rigid assembly 10.

Referring to fig. 3, in one embodiment, recess 121 includes a pump chamber 121a, a first brake chamber 121b located upstream of pump chamber 121a, and a second brake chamber 121c located downstream of pump chamber 121 a.

In one embodiment, the pump body 2 is disposed on a side of the first member 11 facing away from the second member 12. Referring to fig. 6, the pump body 2 includes a pump head frame 28, a camshaft 24 rotatably disposed on the pump head frame 28, a plunger assembly 21 press-fitted to the pump chamber 121a, a first brake valve cylinder assembly 22 press-fitted to the first brake chamber 121b, a second brake valve cylinder assembly 23 press-fitted to the second brake chamber 121c, and a power unit 25 for driving the camshaft 24 to rotate. The ends of the plunger assembly 21, the first brake valve cylinder assembly 22 and the second brake valve cylinder assembly 23 are all in sliding abutting contact with a rotating surface of the camshaft 24, and the camshaft 24 drives the plunger assembly 21, the first brake valve cylinder assembly 22 and the second brake valve cylinder assembly 23 to creep and press the elastic membrane in sequence during rotation so as to enable the liquid in the flow channel 1a to generate directional flow.

According to the infusion box disclosed by the embodiment of the application, each component of the rigid assembly 10 belongs to a rigid injection molding part, the elastic membrane belongs to a flexible injection molding part, and the injection molding part is high in production and processing precision, simple to assemble, small in assembly error and good in product consistency; in addition, the elastic diaphragm 14 is arranged between the two adjacent components, and when the elastic diaphragm is pressed by the plunger assembly 21, the first brake valve post assembly 22 and the second brake valve post assembly 23, the possibility of unexpected displacement and swing of the elastic diaphragm is very small; moreover, the ends of the plunger assembly 21, the first brake valve cylinder assembly 22 and the second brake valve cylinder assembly 23 for extruding the elastic diaphragm may be made into arc surfaces, and the shapes of the pump cavity 121a, the first brake cavity 121b and the second brake cavity 121c matched with the arc surfaces are matched with the arc surfaces. During extrusion, the end shape of the plunger assembly 21 and the shape of the pump cavity 121a, the end shape of the first brake valve post assembly 22 and the shape of the first brake cavity 121b, and the end shape of the second brake valve post assembly 23 and the shape of the second brake cavity 121c can be adapted to each other, so that the requirement of gap machining of mounting holes in the head frame 28 for accommodating the plunger assembly 21, the first brake valve post assembly 22 and the second brake valve post assembly 23 is reduced, the liquid stopping effect is good, and the manufacturing error of the liquid stopping plug 162 can be widened. In addition, the elastic diaphragm itself has excellent resistance to squeezing, and the plunger 21, the first valve stopper 22 and the second valve stopper 23 have arc-shaped end surfaces, so that the risk of damage and leakage due to repeated squeezing is very low.

The infusion pump of the embodiment of the application can be widely applied to various scenes such as conventional infusion, analgesia, blood transfusion, chemotherapy and the like.

In one embodiment, the first stopper chamber 121b, the pump chamber 121a, and the second stopper chamber 121c are sequentially spaced in the liquid flow direction.

The number of members may be two or more. The number of the elastic membranes may be one or more. In one embodiment, the members comprise a first member 11, a second member 12 and a third member 13, the recesses comprise a first recess 121 and a second recess 122, the elastic membrane comprises a first elastic membrane 14 and a second elastic membrane 15, the second member 12 is arranged between the first member 11 and the third member 13, and the side of the second member 12 facing the first member 11 is provided with the first recess 121. Specifically, the partial structure of the second member 12 is recessed, i.e., the first groove 121 is formed, and the first groove 121 is opened toward the first member 11. Referring to fig. 5, the first elastic membrane 14 is disposed between the first member 11 and the second member 12 to hermetically cover the first groove 121, and the first elastic membrane 14 and the first groove 121 cooperate to form a portion 1 a' of the flow channel 1 a.

The second member 12 is formed with a second recess 122 on a side facing away from the first member 11, and the second recess 122 is formed by recessing a portion of the structure of the second member 12, and the second recess 122 is open to the third member 13. The second groove 122 is communicated with the first groove 121 and located downstream of the first groove 121, that is, the flow channel 1a passes through from the first side of the first member 11 to the second side of the first member 11, and the liquid flows from the first side of the second member 12 to the second side of the second member 12. The second elastic membrane 15 is disposed between the second member 12 and the third member 13 to hermetically cover the second groove 122, referring to fig. 5, the second elastic membrane 15 and the second groove 122 cooperate to form another portion 1a ″ of the flow channel 1 a. (ii) a The liquid stop plug 162 is disposed on a side of the third member 13 facing away from the second member 12, and the liquid stop plug 162 presses the second elastic membrane 15 to close the other portion 1a ″ of the flow channel 1 a.

Specifically, referring to fig. 2, a first hole 11a corresponding to the pump chamber 121a, a second hole 11b corresponding to the first stopper chamber 121b, and a third hole 11c corresponding to the second stopper chamber 121c are formed in the first member 11, the plunger assembly 21 may press the first elastic diaphragm 14 after passing through the first hole 11a, the first stopper spool assembly 22 may press the first elastic diaphragm 14 after passing through the second hole 11b, and the second stopper spool assembly 23 may press the second elastic diaphragm 15 after passing through the third hole 11 c.

Specifically, the third member 13 is formed with an avoiding hole 13a, the liquid stop plug 162 penetrates through the avoiding hole 13a from the side of the third member 13 away from the second member 12, and the second elastic membrane 15 abuts against the second groove 122 of the second member 12, so that the liquid cannot flow in the other part 1a ″ of the flow channel 1a, that is, the flow channel 1a is closed. That is, the lock mechanism 16 closes or opens the flow path 1a by the liquid stopper 162.

In one embodiment, referring to fig. 5, an overflowing hole 122a is formed at the end of the second groove 122, and the liquid stop plug 162 presses the second elastic diaphragm 15 to the periphery of the overflowing hole 122a, so as to achieve the purpose of closing the flow channel 1 a.

In the infusion cassette 1 of the embodiment of the present application, the liquid stop plug 162 is disposed on the side of the third member 13 away from the second member 12, so that the locking mechanism 16 and the second brake cylinder assembly 23 can be prevented from interfering with each other. Specifically, it is assumed that the liquid stopper 162 is provided on the side of the first member 11 facing the pump body 2, or the locking structure 16 is provided in close proximity to the second brake cylinder assembly for the sake of compactness, but they are too close and interfere with each other; or the distance between the two is increased appropriately to avoid interference, so that the lengths of the infusion cassette 1 and the pump body 2 must be increased, which results in an increase in the size of the infusion pump. The larger size used as a common infusion pump is acceptable to users, but as a portable analgesia pump, the size should be as compact as possible.

Specifically, when the cassette 1 is combined with the pump body 2, the pump body 2 can drive the lock mechanism 16 to switch from the closed state to the open state and to be held in the open state. When the infusion box 1 is separated from the pump body 2, the locking mechanism 16 can be automatically switched from an open state to a closed state, that is, when the infusion box 1 is combined with the pump body 2, the default state of the infusion box 1 is a state of opening the flow channel 1a, and at the moment, the liquid in the infusion tube 3 is automatically switched to be jointly controlled by the plunger assembly 21, the first brake valve post assembly 22 and the second brake valve post assembly 23 of the pump body 2, namely, the locking mechanism 16 is in the open state; when the infusion cassette 1 and the pump body 2 are separated from each other from the assembled state, the default state of the infusion cassette 1 is a state of closing the flow passage 1a, that is, the locking mechanism 16 is in a closed state, and the liquid in the infusion cassette 1 is prevented from flowing automatically.

The first elastic membrane 14 is made of a material that meets the biocompatibility requirements specified by the relevant standards, and has a desired elasticity and resistance to compression, such as silicone. Similarly, the second elastic membrane 15 should be made of a material that meets the biocompatibility requirements specified by the relevant standards, and has a desired elasticity and resistance to extrusion, such as silicone.

The material of the first elastic membrane 14 and the material of the second elastic membrane 15 may be the same or different, and are not limited herein.

In one embodiment, referring to fig. 2, the locking mechanism 16 further includes an elastic member 17, and the elastic member 17 applies a force to the mounting frame 161 to keep the locking mechanism 16 in a closed state for closing the flow passage 1a, that is, in the absence of an external force, the default position of the locking mechanism 16 is in the closed state. When no external force acts on the lock mechanism 16, the lock mechanism 16 is relatively stably in the closed state by the elastic member 17.

The specific structure type of the elastic member 17 is not limited, and for example, a tension spring, a compression spring, a torsion spring, and other elastic bodies. In the embodiment of the present application, the elastic member 17 is a torsion spring.

In one embodiment, the open state of the locking mechanism 16 includes a first open state, and the locking mechanism 16 is maintained in the first open state by an external force; when the external force disappears or the elastic force of the external force elastic member 17 can overcome the acting force of the external force on the locking mechanism 16, the elastic member 17 can drive the locking mechanism 16 to automatically switch from the first open state to the closed state.

Specifically, in the process of combining the pump body 2 with the infusion cassette 1, the acting force of the pump head frame 28 of the pump body 2 on the locking mechanism 16 is the external force, and when the acting force of the pump head frame 28 of the pump body 2 on the locking mechanism 16 overcomes the acting force of the elastic member 17 on the locking mechanism 16, the pump head frame 28 of the pump body 2 drives the locking mechanism 16 to switch from the closed state to the first open state and keeps the locking mechanism 16 in the open state. When the pump head frame 28 of the pump body 2 is separated from the infusion cassette 1, the acting force of the pump head frame 28 of the pump body 2 on the locking mechanism 16 disappears, namely the external force acting on the locking mechanism 16 disappears, and the elastic piece 17 drives the locking mechanism 16 to automatically switch from the first open state to the closed state. That is, an external force is required to act on the locking mechanism 16 to maintain the locking mechanism 16 in the first open state.

That is to say, when the infusion box of the embodiment of the application is buckled with the pump body, the flow channel in the infusion box is automatically opened, other operations are not needed, and great convenience is brought to users. When the infusion box is separated from the pump body, the locking mechanism 16 automatically closes the flow channel, so that the liquid in the infusion box can be prevented from flowing automatically, and the excessive infusion or the harm of the liquid medicine to the environment can be prevented.

In one embodiment, the open state further comprises a second open state. Referring to fig. 4, the locking mechanism 16 includes a latch structure 1614 disposed on the mounting frame 161, wherein the latch structure 1614 is capable of being lockingly engaged with the rigid assembly 10 to lock the locking mechanism 16 in the second open state. In both the first open state and the second open state, the flow path 1a is in an open state, and the liquid can continuously flow through the flow path 1a, for example, before infusion, air in the infusion set is often removed by the second open state.

With the pump body 2 separated from the feeding cassette 1, when it is desired to maintain the flow channel 1a in the open state, the latch structure 1614 can be locked into engagement with the rigid assembly 10, and at this time, the locking mechanism 16 and the rigid assembly 10 do not move relative to each other, and the locking mechanism 16 is locked in the second, open state.

In one embodiment, referring to fig. 2, the rigid assembly 10 is provided with two through holes 1d penetrating through the rigid assembly 10 along a thickness direction of the rigid assembly 10, the flow channel 1a is located between the two through holes 1d, the mounting frame 161 includes a cross bar 1612, a connecting bar 1611 and a sliding bar 1613, a sliding bar 1613 is disposed in each through hole 1d, the connecting bar 1611 and the cross bar 1612 are disposed on two opposite sides of the rigid assembly 10 along the thickness direction, first ends of the two sliding bars 1613 are connected to the connecting bar 1611, second ends of the two sliding bars 1613 are connected to the cross bar 1612, and the liquid blocking plug 162 is disposed on the cross bar 1612. When the pump head frame 28 of the pump body 2 is combined with the infusion cassette 1, the pump head frame 28 of the pump body 2 pushes the connecting rod 1611 to move towards the third member 13, the connecting rod 1611 drives the whole locking mechanism 16 to move synchronously, and the liquid stop plug 162 gradually disengages from the second elastic membrane 15 during the movement.

It should be noted that the connecting rod 1611 and the cross rod 1612 are of a split structure, that is, the connecting rod 1611 and the cross rod 1612 are not integrally formed, so that the sliding rod 1613 can pass through the through hole 1d conveniently. Specifically, the connecting rod 1611 and the two sliding rods 1613 may be integrally formed, for example, integrally formed injection-molded parts; the cross bar 1612 may be integrally formed with the two slide bars 1613, for example, as an integrally molded plastic.

In the embodiment of the present application, the connecting rod 1611 and the two sliding rods 1613 are integrally formed as an example.

For example, to facilitate the connection between the sliding rod 1613 and the cross bar 1612, in an embodiment, please refer to fig. 2, the cross bar 1612 has connecting holes 1612a at two opposite ends, and the connecting holes 1612a may be blind holes or through holes, which is not limited herein. A second end of the sliding rod 1613 is fixedly inserted into the connecting hole 1612a, for example, the sliding rod 1613 is inserted into the connecting hole 1612a and then bonded or ultrasonically welded to the inner wall of the connecting hole 1612 a; alternatively, the sliding rod 1613 is in interference fit with the connecting hole 1612a, and the two are fixedly connected by friction.

To facilitate quick positioning of the crossbar 1612 during assembly, in one embodiment, the circumferential surface of the second end of the sliding bar 1613 is provided with a stepped surface 1613a, and the crossbar 1612 abuts the stepped surface 1613 a. During assembly, only the connecting holes 1612a on the cross rod 1612 need be aligned with the sliding rods 1613 and pushed towards the sliding rods 1613 until the cross rod 1612 abuts against the step surfaces 1613a, and then the cross rod 1612 and the sliding rods 1613 can be quickly assembled through the step surfaces 1613a, the relative positions of the cross rod 1612 and the sliding rods 1613 can be guaranteed, and the batch consistency of products is improved.

In one embodiment, the latch structures 1614 protrude from the surface of the slide bars 1613, and the latch structures 1614 are located on a side of one slide bar 1613 facing away from the other slide bar 1613. It is understood that the latch mechanism 1614 may be provided on one sliding bar 1613, or the latch mechanisms 1614 may be provided on both sliding bars 1613. The embodiment of the present application is described by taking an example in which the two sliding rods 1613 are both provided with a latch structure 1614.

The specific structure of the latch structure 1614 is not limited, for example, in the embodiment of the present application, the latch structure 1614 is substantially a plate extending along the length of the sliding rod 1613.

Referring to fig. 2, in an embodiment, a sliding groove 1f is formed on a wall surface corresponding to the through hole 1d, and the latch structure 1614 is linearly slidably engaged with the sliding groove 1f along the thickness direction of the infusion cassette 1, that is, the latch structure 1614 can slide in the sliding groove 1f in a reciprocating manner along the thickness direction of the infusion cassette 1; a stopper portion 110 protruding toward the avoidance hole is formed on the first member 11; when the sliding rod 1613 slides to a position where the latch structure 1614 does not interfere with the stopper 110, the locking mechanism 16 can swing along the length direction of the infusion cassette, and the latch structure 1614 slides into the sliding groove 1f and abuts against one side of the stopper 110 facing the second member 12, thereby locking the locking mechanism 16 in the second open state.

In addition, when the lock mechanism 16 is in the first open state, the lock mechanism 16 may be switched to the second open state, or the lock mechanism 16 may be switched to the closed state.

In one embodiment, referring to fig. 6, a portion of the mounting frame 161 protrudes from a side of the first member 11 facing the pump body 2; a convex column 281 used for pushing the mounting frame 161 is formed on one side of the pump head frame 28 facing the infusion box 1, and an inclined surface 281a is formed at the end part of the convex column 281 facing one end of the infusion box 1; during the assembly of the feeding cassette 1 and the pump body 2, the inclined surface 281a pushes the mounting frame 28 to move toward the third member 13 to fix the locking mechanism 16 at the position of the first open state.

The inclined surface 281a has a positioning function on the mounting frame 28, and after the infusion box 1 and the pump body 2 are combined, the inclined surface 281a abuts against the mounting frame 161, so that the mounting frame 161 is prevented from moving along the thickness direction of the infusion box 1 and swinging along the length direction of the infusion box 1, that is, the locking mechanism 16 is fixed at the current position and cannot displace, and the working reliability of the locking mechanism 16 can be improved.

In one embodiment, the flow channel 1a extends along a straight line in a projection perpendicular to the thickness direction of the infusion cassette 1, thus facilitating the structural arrangement of the pump body 2.

In the embodiment of the application, the plunger assembly 21, the first brake valve cylinder assembly 22 and the second brake valve cylinder assembly 23 are driven by the same camshaft 24, so that on one hand, the driving structure can be simplified, the product has a compact structure and is convenient to carry; on the other hand, the cost can be reduced.

It should be noted that the plunger assembly 21 may be a single cylinder, or may be a structure formed by combining multiple components. Similarly, the first brake cylinder assembly 22 may be a single cylinder or a combination of multiple components. The second brake cylinder assembly 23 may be a single cylinder or a combination of components. The embodiment of the present application does not limit this.

In an embodiment, referring to fig. 2 and 7, the first groove 121 includes two pressure monitoring cavities 121d, one of the pressure monitoring cavities 121d is disposed upstream of the first braking cavity 121b, the other pressure monitoring cavity 121d is disposed downstream of the second braking cavity 121c, the first member 11 is provided with a fourth hole 11d corresponding to the pressure monitoring cavity 121d, the pump body 2 includes a pressure monitoring device 26, and the pressure monitoring device 26 abuts against the first elastic diaphragm 14 through the fourth hole 11 d. The pressure monitoring device 26 monitors the pressure of the liquid in the flow path 1a, and can determine whether the pressure is abnormal, blocked, or empty based on the pressure value.

In one embodiment, the pump body 2 further comprises an ultrasonic bubble monitoring device 27 to monitor whether bubbles are present in the liquid in the flow channel 1 a. The number of the ultrasonic bubble monitoring devices 27 may be one or more, and is not limited herein.

The specific structural form of the power unit 25 is not limited, and in the embodiment of the present application, the power unit 25 includes a motor 251 and a transmission mechanism 252, and the transmission mechanism 252 connects the rotating shaft of the motor 251 and the cam shaft 24. The drive mechanism 252 may be a chain, belt, or a set of drive-engaging gears. In the embodiment of the present application, the transmission mechanism 252 is a gear set, and the gear set includes at least two gears, one of the gears is disposed coaxially with the camshaft 24, and the other gear is disposed coaxially with the rotating shaft, and the two gears may be in direct engagement transmission or in indirect transmission through other intermediate gears.

The transmission mechanism 252 may be a one-stage transmission, a multi-stage transmission, etc., and is not limited herein.

In one embodiment, the motor 251 is a dc motor, so that the motor 251 has a small volume. In this application embodiment, camshaft 21 only need drive plunger subassembly 21, first brake valve post subassembly 22 and second brake valve post subassembly 23 in proper order wriggle can, consequently, the torque of small-size direct current motor output is enough to satisfy camshaft 21 required torque, consequently, the transfer pump of this application embodiment, only set up a motor can, the transfer pump is small, portable, is fit for using as portable analgesia pump.

In one embodiment, the camshaft 21 can rotate in forward and reverse directions, and when the camshaft 21 rotates in forward direction, the camshaft 21 drives the plunger assembly 21, the first brake valve cylinder assembly 22, and the second brake valve cylinder assembly 23 to creep in forward timing to drive the fluid in the flow passage to flow in forward direction, and the fluid enters the patient. When the camshaft 21 rotates reversely, the camshaft 21 drives the plunger assembly 21, the first brake valve cylinder assembly 22 and the second brake valve cylinder assembly 23 to creep in reverse timing to drive the liquid in the flow passage to flow in reverse direction. When liquid is blocked in the conveying process, the cam shaft 21 can be controlled to rotate reversely accurately, the liquid is pumped back by the liquid conveying pump, blocking pressure is released, and the risk of injury to a patient caused by the blocking pressure is greatly reduced.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

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

Claims

1. An infusion cassette of an infusion set, characterized in that the infusion cassette has a flow channel (1a), the infusion cassette comprising:

a rigid assembly (10), the rigid assembly (10) comprising a plurality of components arranged in a stack, at least one of the components having a recess provided therein;

the locking mechanism (16) comprises a mounting frame (161) and a liquid stopping plug (162) fixedly arranged on the mounting frame (161), the liquid stopping plug (162) can press the elastic membrane (15) to close the flow channel (1a), the locking mechanism (16) closes or opens the flow channel (1a) through the liquid stopping plug (162), and the mounting frame (161) is movably connected with the main body framework so that the locking mechanism (16) can be switched between a closing state for closing the flow channel (1a) or an opening state for opening the flow channel (1 a).

2. The infusion cassette according to claim 1, characterized in that the members comprise a first member (11), a second member (12) and a third member (13), the grooves comprising a first groove (121) and a second groove (122), the elastic membrane comprising a first elastic membrane (14) and a second elastic membrane (15), the second member (12) being arranged between the first member (11) and the third member (13), the second member (12) being provided with the first groove (121) on a side facing the first member (11), the first elastic membrane (14) being arranged between the first member (11) and the second member (12) to sealingly cover the first groove (121); a second groove (122) is formed on one side of the second component (12) facing away from the first component (11); the second groove (122) communicates with the first groove (121) and is located downstream of the first groove (121); the second elastic membrane (15) being arranged between the second member (12) and the third member (13) to sealingly cover the second recess (122); the liquid stop plug (162) is arranged on one side, away from the second component (12), of the third component (13), and the liquid stop plug (162) presses the second elastic membrane (15) to close the flow channel (1 a).

3. An infusion cassette according to claim 1, characterized in that the infusion cassette comprises a resilient member (17), the resilient member (17) exerting a force on the mounting frame (161) to enable the locking mechanism (16) to be maintained in a closed state closing the flow channel (1 a).

4. The infusion cassette according to claim 3, characterized in that the open state comprises a first open state in which the locking mechanism (16) is held under the action of an external force; when the external force disappears or the elastic force of the elastic piece (17) overcomes the acting force of the external force on the locking mechanism (16), the elastic piece (17) drives the locking mechanism (16) to automatically switch from the first open state to the closed state.

5. The infusion cassette according to claim 4, characterized in that the open state comprises a second open state, the locking mechanism (16) comprising a latch structure (1614) provided on the mounting frame (161); the latch structure (1614) is selectively lockingly engageable with the rigid assembly (10) to lock the locking mechanism (16) in the second open condition.

6. Infusion cassette according to claim 5, wherein the rigid assembly (10) is provided with two through holes (1d) passing through the rigid assembly (10) in the thickness direction of the rigid assembly (10), the flow channel (1a) being located between the two through holes (1 d); mounting bracket (161) includes horizontal pole (1612), connecting rod (1611) and slide bar (1613), each all be provided with one in through hole (1d) slide bar (1613), connecting rod (1611) with horizontal pole (1612) set up in rigidity subassembly (10) is along the relative both sides of thickness direction, two the first end of slide bar (1613) with connecting rod (1611) is connected, two the second end of slide bar (1613) with horizontal pole (1612) is connected, end liquid stopper (162) set up in on horizontal pole (1612).

7. The infusion cassette according to claim 6, wherein the cross bar (1612) is provided with two connecting holes (1612a), and the second end of the sliding rod (1613) is fixedly arranged in the connecting holes (1612 a).

8. The infusion cassette according to claim 7, wherein a circumferential surface of the second end of the slide rod (1613) is provided with a stepped surface (1613a), the cross-bar (1612) abutting the stepped surface (1613 a).

9. The infusion cassette according to claim 6, wherein the latch structure (1614) protrudes from the surface of the slide rod (1613), and a sliding groove (1f) is formed on the corresponding wall surface of the through hole (1 d); a stopper portion (110) protruding toward the through hole (1d) is formed on the first member (11); when the sliding rod (1613) slides to a position where the latch structure (1614) does not interfere with the stopping portion (110), the locking mechanism (16) can swing along the length direction of the infusion cassette, and the latch structure (1614) slides into the sliding groove (1f) and abuts against one side of the stopping portion (110) facing the second member (12), so that the locking mechanism (16) is locked in a second open state.

10. Infusion cassette according to claim 1, characterized in that the flow channel (1a) extends in a straight line in a projection perpendicular to the thickness direction of the infusion cassette.

11. An infusion set, characterized by comprising a multi-segment infusion tube (3) and an infusion cassette according to any one of claims 1 to 10, said infusion cassette having a liquid inlet (1b) and a liquid outlet (1c), wherein one segment of said infusion tube (3) is connected to said liquid inlet (1b), wherein another segment of said infusion tube (3) is connected to said liquid outlet (1c), said infusion tube (3) being in communication with said flow channel (1 a).

12. An infusion pump comprising a pump body (2) and an infusion set according to claim 11, the pump body (2) being capable of driving the latch mechanism (16) to switch from a closed state to an open state and to remain in the open state when the infusion cassette is combined with the pump body (2); the locking mechanism (16) can be automatically switched from an open state to a closed state when the infusion cassette is detached from the pump body (2).