CN211561370U

CN211561370U - Infusion pump and injection pump

Info

Publication number: CN211561370U
Application number: CN201921978334.0U
Authority: CN
Inventors: 刘华勇; 赵鹏仕; 伍鼎韡
Original assignee: Shenzhen Mindray Scientific Co Ltd
Current assignee: Shenzhen Mindray Scientific Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-09-25
Anticipated expiration: 2029-11-15

Abstract

The utility model discloses an injection pump, which comprises a pump body, a transmission component, a push-pull box and a processor, wherein the push-pull box comprises a pressure sensor component and a limit component which are arranged in the inner cavity of the box body; the pressure sensor assembly is installed in the inner cavity of the box body through the limiting assembly, and when the sensing surface receives direct acting force from the piston rod of the syringe or indirect acting force from the piston rod of the syringe, the pressure sensor assembly moves along the force receiving direction. The utility model also discloses an infusion pump, which comprises a pump main body, a peristaltic extrusion mechanism, a slide block, a pressure sensor assembly and a processor; the pressure sensor assembly is installed in the inner cavity of the pump main body through the limiting assembly, and when the sensing surface receives direct acting force from the sliding block or indirect acting force from the sliding block, the pressure sensor assembly moves along the force receiving direction. According to the injection pump and the infusion pump, the pressure sensor assembly is installed in a floating mode, so that initial stress cannot be generated due to fixed installation, and detection precision is improved.

Description

Infusion pump and injection pump

Technical Field

The utility model relates to a pressure detection technical field, more specifically say, relate to an injection pump and transfer pump.

Background

The infusion pump, the injection pump and other equipment are all required to be provided with pressure sensor components, and the infusion or injection process is fed back through pressure detection. The pressure sensor assembly is typically mounted in a direct-mount manner, such as by screws that secure the pressure sensor assembly within the housing of an infusion or syringe pump. However, the direct fixation of the pressure sensor assembly itself may have deformation, which may generate initial stress, thereby affecting the sensitivity and detection accuracy of the pressure sensor assembly.

With the improvement of infusion pumps and injection pumps on the requirement of pressure detection precision, the installation mode of directly fixing the pressure sensor assembly cannot meet the requirement of high detection precision.

Disclosure of Invention

In view of this, the embodiment of the utility model provides an injection pump and transfer pump, this injection pump and transfer pump's structural design can solve the problem that the pressure sensor subassembly detects the precision and can not satisfy the requirement effectively.

The embodiment of the utility model provides an injection pump, which is used for being matched with an injector for use and comprises a pump body, a transmission component, a push-pull box and a processor, wherein the pump body is used for driving the push-pull box to do linear motion through the transmission component under the driving of the processor; the push-pull box is provided with a box body inner cavity and a window penetrating through the box body inner cavity, and the push-pull box further comprises a pressure sensor assembly and a limiting assembly which are arranged in the box body inner cavity; the pressure sensor assembly is used for converting the acting force on the sensing surface of the pressure sensor assembly into an electric signal and sending the electric signal to the processor; the pressure sensor subassembly passes through spacing subassembly and installs intracavity in the box body, and when the response face receives and comes from the direct effort of syringe piston rod or come from when the indirect effort of syringe piston rod, the pressure sensor subassembly moves along the atress direction, wherein comes from the direct effort of syringe piston rod is syringe piston rod direct contact pressure sensor subassembly and the application of force, wherein comes from the indirect effort of syringe piston rod is the syringe piston rod passes through the power transmission piece and applies the power for the pressure sensor subassembly.

Use the embodiment of the utility model provides an injection pump installs the syringe on push-and-pull box, and the pressure sensor subassembly passes through spacing unit mount intracavity in the box body, and when the pressure of syringe piston rod directly or indirectly acted on the response face of pressure sensor subassembly, the pressure sensor subassembly removed along the atress direction to after removing to unsteady utmost point position, the pressure of syringe piston rod can transmit to the response face, and the effort that the pressure sensor subassembly received its response face converts the signal of telecommunication into and sends the treater, realizes pressure detection. Because the pressure sensor assembly is movably mounted in the stress direction, initial stress cannot be generated due to fixed mounting, adverse effects of the initial stress caused by direct fixed mounting on the sensitivity and the precision of the pressure sensor assembly are avoided, and the sensitivity and the detection precision of the pressure sensor assembly are improved.

The embodiment of the utility model also provides an infusion pump, which is used for being matched with an infusion tube for use and comprises a pump main body, a peristaltic extrusion mechanism, a slide block, a pressure sensor component and a processor, wherein the pump main body is internally provided with a pump main body inner cavity and a window communicated with the pump main body inner cavity; the peristaltic extrusion mechanism is positioned in the inner cavity of the pump main body and extrudes the infusion tube; the sliding block is limited and connected in a window of the pump main body through a limiting component, the sliding block can slide in the window of the pump main body along the central axis direction of the window, and the sliding block is positioned on a first surface of the window and contacts the infusion tube; the pressure sensor assembly is used for converting the acting force on the sensing surface of the pressure sensor assembly into an electric signal and sending the electric signal to the processor; the pressure sensor assembly is installed in the inner cavity of the pump main body through a limiting assembly, and when the sensing surface is subjected to direct acting force from the sliding block or indirect acting force from the sliding block, the pressure sensor assembly moves along a force-bearing direction, wherein the direct acting force from the sliding block is force applied by the sliding block in direct contact with the pressure sensor assembly, and the indirect acting force from the sliding block is force applied to the pressure sensor assembly by the sliding block through a force transmission piece.

Use the utility model provides an infusion pump installs the transfer line in the pump main part, the pressure sensor subassembly passes through spacing unit mount at the internal cavity of pump main part, the slider receives the pressure of transfer line when directly or indirectly acting on the response face of pressure sensor subassembly, the pressure sensor subassembly removes along the atress direction to after removing extremely spacing to floating, the slider receives the pressure transmission to the response face of transfer line, the effort that the pressure sensor subassembly received its response face converts the signal of telecommunication into to the treater, realizes pressure detection. Because the pressure sensor assembly is movably mounted in the stress direction, initial stress cannot be generated due to fixed mounting, adverse effects of the initial stress caused by direct fixed mounting on the sensitivity and the precision of the pressure sensor assembly are avoided, and the sensitivity and the detection precision of the pressure sensor assembly are improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is an exploded view of a push-pull box of a syringe pump according to an embodiment of the present invention;

FIG. 2 is an exploded view of the pressure sensor assembly of FIG. 1;

FIG. 3 is a cross-sectional view of the assembled state corresponding to FIG. 2;

fig. 4 is a schematic cross-sectional view illustrating a mounting manner of a pressure sensor assembly of an infusion pump according to an embodiment of the present invention.

The drawings are numbered as follows:

the pressure sensor comprises a pressure sensor component 11, a screw 12, a head 121, a limiting part 122, a threaded part 123, a force transmission piece 13, a mounting part 131, a columnar probe 132, a columnar limiting part 133, a sensor support 14, a push-pull box 15 and a waterproof membrane 16; FIG. 3 is a drawing showing the direction of force applied to the plunger rod of the syringe by the hollow arrow;

the pressure sensor assembly 21, the screw 22, the head 221, the limiting part 222, the threaded part 223, the slider 23, the sensor support 24 and the pump body 25.

Detailed Description

The embodiment of the utility model discloses injection pump and transfer pump to improve its pressure sensor subassembly's sensitivity and detection precision.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, fig. 1 is a schematic diagram illustrating an exploded structure of a push-pull box of an injection pump according to an embodiment of the present invention; FIG. 2 is an exploded view of the pressure sensor assembly of FIG. 1; fig. 3 is a sectional view of fig. 2 in an assembled state.

In one embodiment, the present invention provides a syringe pump for use with a syringe, comprising a pump body, a drive assembly, a push-pull cassette 15, and a processor.

Wherein, the pump body is used for driving the push-pull box 15 to do linear motion through the transmission component under the driving of the processor. The transmission assembly specifically comprises a screw rod nut assembly and the like, the pump body comprises a motor, the motor drives the screw rod to rotate under the driving of the processor, and the nut matched with the screw rod drives the push-pull box 15 to move linearly. The pump body drives the specific connection structure of the push-pull box 15 through the transmission assembly, etc. also refer to the related arrangement of the conventional injection pump in the prior art.

The push-pull box 15 has a box inner cavity and a window penetrating through the box inner cavity, and the push-pull box 15 further comprises a pressure sensor assembly 11 and a limiting assembly arranged in the box inner cavity. The box body of the push-pull box 15 forms a box body inner cavity, and the shape of the specific box body inner cavity is set according to needs and is not particularly limited here. The pressure sensor assembly 11 is installed in the inner cavity of the box body through the limiting assembly, and the pressure sensor assembly 11 can move along the stress direction when receiving direct acting force from a syringe piston rod or indirect acting force from the syringe piston rod. That is to say, pressure sensor subassembly 11 adopts and floats the installation in the atress direction, when receiving the direct effort that comes from the syringe piston rod or the indirect effort that comes from the syringe piston rod, moves along the atress direction earlier to when moving to the support of restricted bit subassembly or box body inner wall face, that is when the atress moves to the limit position that floats, pressure sensor subassembly 11 is fixed, then the pressure of syringe piston rod can directly or indirectly transmit to the response face of pressure sensor subassembly 11, pressure sensor subassembly 11 converts the effort that its response face received into the signal of telecommunication and sends the treater. The structure, operation principle, and the like of the pressure sensor assembly 11 can be referred to the prior art. Specifically, the pressure sensor assembly 11 may be a strain gauge pressure sensor assembly, a piezoelectric pressure sensor assembly, or the like.

Wherein the direct force from the syringe plunger rod is the force applied by the syringe plunger rod directly contacting the pressure sensor assembly 11, and wherein the indirect force from the syringe plunger rod is the force applied by the syringe plunger rod to the pressure sensor assembly 11 through the force transmitter 13.

When the injection pump is used, the injector is arranged on the injection pump, the piston rod of the injector directly or indirectly acts on the sensing surface of the pressure sensor assembly 11, so that the pressure sensor assembly 11 is forced to move, and from the time of moving to the floating limit position, the pressure of the piston rod of the injector can be directly or indirectly transmitted to the sensing surface of the pressure sensor assembly 11, so that the pressure detection in the piston cavity of the injector is realized. Specifically, the effect of the pressure sensor assembly 11 moving within the floating gap under force on pressure detection can be counteracted by a backlash elimination algorithm of the controller.

It should be noted that, for convenience of description, the floating direction of the pressure sensor assembly 11 is referred to as the up-down direction and the floating direction perpendicular to the up-down direction is referred to as the horizontal direction, and the up-down direction and the horizontal direction refer to opposite directions and are not used as a limitation on the actual direction of the syringe pump during use.

Use the utility model provides an injection pump, install the syringe on push-and-pull box 15, pressure sensor subassembly 11 is installed at the box body intracavity through spacing subassembly, when the pressure of syringe piston rod directly or indirectly acted on pressure sensor subassembly 11's response face, pressure sensor subassembly 11 removes along the atress direction, and when removing to unsteady extreme position, then the pressure of syringe piston rod can directly or indirectly transmit to pressure sensor subassembly 11's response face, pressure sensor subassembly 11 converts the effort that its response face received into the signal of telecommunication and gives the treater, realize pressure detection. Because the pressure sensor assembly 11 is installed in a floating manner in the stress direction, initial stress cannot be generated due to fixed installation, adverse effects of the initial stress caused by direct fixed installation on the sensitivity and the precision of the pressure sensor assembly 11 are avoided, and the sensitivity and the detection precision of the pressure sensor assembly 11 are improved.

Specifically, the force transmission member 13 is confined within the window and moves in the force direction to contact the sensing surface of the pressure sensor assembly 11 when directly acted upon by the syringe plunger rod. That is, the force transmitter 13 is limited in the window and can move in the window, and the sensing surface of the pressure sensor assembly 11 faces the force transmitter 13. When the syringe is mounted on the push-pull box 15, the piston rod abuts against the force transmission member 13 and applies force to the force transmission member 13, and the force transmission member 13 moves under force to contact the sensing surface of the pressure sensor assembly 11. When the push-pull box 15 pushes the piston rod to move forward, the pressure of the piston rod is transmitted to the sensing surface of the pressure sensor assembly 11 through the force transmission member 13, so that the pressure sensor assembly 11 converts the acting force applied to the sensing surface into an electric signal and sends the electric signal to the processor. At the same time, the pressure sensor assembly 11 is fixed by the pressure action of the force transmitter 13. The pressure of the piston rod of the syringe is transmitted to the sensing surface of the pressure sensor assembly 11 through the force transmission piece 13, namely the sensing surface is directly matched with the force transmission piece 13, the mounting problem that the specifications of the piston rod are different does not need to be considered, and the syringe with different specifications can be accurately detected.

Specifically, the force transmission member 13 includes a mounting portion 131 for abutting against the syringe piston rod and a columnar probe 132 fixedly connected to the mounting portion 131, and the columnar probe 132 contacts with the sensing surface to transmit the pressure of the syringe piston rod to the sensing surface.

According to the needs, can also be with the response face of pressure sensor subassembly 11 dorsad syringe piston rod, force transmission piece 13 is including the impeller of restriction in the window and the response portion of box body intracavity orientation response face, and the impeller is when receiving the direct effort of syringe piston rod, moves along the atress direction to make the response face contact response portion of pressure sensor subassembly 11, and can move to the extreme position that floats under the promotion of response portion, thereby detect the pressure of syringe piston rod.

Specifically, the sensing surface of the pressure sensor assembly 11, the force transmitter 13 and the window are arranged along a straight line. That is, the force transmission member 13 directly and linearly transmits the pressure of the syringe piston rod from the window to the sensing surface along the pressure direction, so that the sensing surface detects the pressure of the syringe piston rod. According to the requirement, the sensing surface, the force transmission piece 13 and the window can be not on the same straight line, such as the space layout in the inner cavity of the box body. If the force transmission piece 13 is in a broken line shape, the end of one broken line segment is abutted against the piston rod of the syringe and moves along the window under the pressure of the piston rod of the syringe, and the end of the other broken line segment is used for contacting with the sensing surface.

In order to prevent contaminants from entering the interior of the push-pull box 15 through the window, a waterproof membrane 16 is included that seals between the force transmitter 13 and the window. Specifically, one end of the waterproof membrane 16 is connected with the window in a sealing mode all around, and the other end of the waterproof membrane is connected with the force transmission piece 13 in a sealing mode all around, so that the inside of the push-pull box 15 is isolated from the outside, and the inside of the push-pull box 15 is not easily polluted. The waterproof membrane 16 may be a flexible membrane, and when the force transmission member 13 moves under the pressure of the syringe piston rod, the flexible membrane deforms to adapt to the movement of the force transmission member 13.

The pressure sensor assembly 11 is floatingly mounted in the box body cavity through a limiting assembly, in one embodiment, the limiting assembly comprises a screw 12, and a floating gap is formed between a positioning surface of a head 121 of the screw 12 facing the pressure sensor assembly 11 and a matching surface of the head 121 of the pressure sensor assembly 11 facing the screw 12. That is, the pressure sensor assembly 11 is installed in the box body cavity through the screw 12, the end surface of the head 121 of the screw 12 facing the pressure sensor assembly 11 is a positioning surface, the pressure sensor assembly 11 has a mating surface facing the head 121 of the screw 12, and a floating gap is formed between the positioning surface and the mating surface. The screw 12 is in threaded fit with the wall surface of the inner cavity of the box body, the wall surface is provided with an end surface facing one end, away from the head 121 of the screw 12, of the pressure sensor assembly 11 and limiting, the thickness between the matching surface facing the head 121 of the screw 12 of the pressure sensor assembly 11 and the matching surface facing the end surface is smaller than the distance between the positioning surface facing the head 121 of the screw 12 to the pressure sensor assembly 11 and the end surface facing one end, away from the head 121 of the screw 12, of the pressure sensor assembly 11 and limiting, and the distance difference between the two is the size of the floating gap of the pressure sensor assembly 11. The floating gap may be set to 0.1mm specifically as required. When the pressure sensor assembly 11 is not subjected to direct force or indirect force of the syringe piston rod, the pressure sensor assembly 11 can float up and down in the floating gap, so that initial stress cannot be generated due to fixed installation.

When the force transmission member 13 is limited in the window and is directly acted by the syringe piston rod, the force transmission member 13 moves along the force-receiving direction to contact the sensing surface of the pressure sensor assembly 11, the pressure of the syringe piston rod acts on the force transmission member 13, the force transmission member 13 transmits the pressure of the syringe piston rod to the sensing surface of the pressure sensor assembly 11, the pressure sensor assembly 11 moves along the force-receiving direction, and when the matching surface of the pressure sensor assembly 11 facing the head 121 of the screw 12 is abutted against the positioning surface of the head 121 of the screw 12 facing the pressure sensor assembly 11, the pressure of the syringe piston rod is indirectly transmitted to the sensing surface of the pressure sensor assembly 11 through the force transmission member 13, and the pressure sensor assembly 11 converts the acting force applied to the sensing surface into an electric signal and transmits the electric signal to the processor to realize pressure detection.

Specifically, a sensor through hole is formed in the pressure sensor assembly 11, the screw 12 penetrates through the sensor through hole to be in threaded connection with the wall surface of the inner cavity of the box body, and the rod portion of the screw 12 comprises a limiting portion 122 matched with the sensor through hole and a threaded portion 123 in threaded connection with the wall surface of the inner cavity of the box body. The screw 12 penetrates through the sensor through hole, so that the up-and-down floating of the pressure sensor assembly 11 can be limited through the head 121 of the screw 12, and meanwhile, the horizontal displacement of the pressure sensor assembly 11 can also be limited. The depth of the through hole is smaller than the distance from the end face of the head 121 of the screw 12 opposite to the pressure sensor component 11 to the end face of the inner cavity of the box body opposite to the pressure sensor component 11, that is, the length of the limiting part 122 is larger than the depth of the sensor through hole. The specific difference is the floating gap size of the pressure sensor assembly 11.

In one embodiment, the sensor through hole comprises a circular hole. The rod part of the screw 12 penetrates through the round hole to limit the pressure sensor component 11 and is in threaded connection with the wall surface in the inner cavity of the box body. The limiting part 122 of the rod part of the screw 12 can be correspondingly set to be a round rod, the size of the round rod is matched with that of the round hole, and the guiding effect is achieved on the up-and-down floating of the pressure sensor assembly 11 while the pressure sensor assembly is limited in the horizontal direction.

Further, at least two circular holes are provided on the pressure sensor assembly 11. Through the setting of two at least round holes, with it the complex carry on spacingly with pressure sensor subassembly 11 through two at least screws 12, then pressure sensor subassembly 11 is injectd at the displacement of horizontal direction, therefore can guarantee pressure sensor subassembly 11's response face position to in the accurate pressure of measuring the syringe piston rod. According to the requirement, the limitation of the horizontal displacement of the pressure sensor assembly 11 can also be realized by the matching of the horizontal limiting component and the single round hole with the screw 12.

In another embodiment, the sensor through-holes comprise profiled holes having a non-circular cross-section. It should be noted that the non-circular figure refers to a figure that cannot be formed by rotating a wire around a certain point, such as a polygon like a square, a rectangle, a triangle, or the like, or an ellipse, or other irregular figure. The circle is a revolution pattern.

In one embodiment, the pressure sensor assembly 11 is provided with a special-shaped hole, and the limiting portion 122 engaged with the special-shaped hole is a special-shaped portion having the same cross-sectional shape as the special-shaped hole. The sensor through hole is a special-shaped hole, the limiting part 122 of the screw 12 is a special-shaped part with the same shape, the special-shaped part penetrates through the special-shaped hole, and one special-shaped hole can limit the rotation of the screw 12 in the horizontal direction. According to the needs, in order to improve spacing reliability, can also add the round hole on the basis of a special-shaped hole.

Pressure sensor subassembly 11 floats through spacing subassembly and installs at the box body intracavity, and in another embodiment, spacing subassembly is including being fixed in the box body intracavity and being used for the side limiting plate of restriction pressure sensor subassembly 11 displacement all around and the terminal surface limiting plate of restriction pressure sensor subassembly 11 in the direction of force position, has the clearance of floating between the fitting surface of terminal surface limiting plate towards pressure sensor subassembly 11 and the pressure sensor subassembly 11 towards the terminal surface limiting plate. That is, the horizontal displacement of the pressure sensor assembly 11 is limited by the side limiting plate to ensure the horizontal position of the sensing surface. The stress direction displacement of the pressure sensor assembly 11 is limited through the end face limiting plate, specifically, the end face limiting plate is fixedly connected to the top end of the side limiting plate and surrounds a mounting groove with the side limiting plate and the wall surface of the inner cavity of the box body, and then the end of the pressure sensor assembly 11 is inserted into the limiting groove for mounting. The height of the part, inserted into the limiting groove, of the pressure sensor assembly 11 is smaller than that of the mounting groove, and the height difference between the height of the pressure sensor assembly 11 and the height of the mounting groove is the size of the floating gap of the pressure sensor assembly 11. According to the requirement, the floating gap type pressure sensor assembly can also comprise two end face limiting plates which are oppositely arranged, the end part of the pressure sensor assembly 11 is inserted between the two end face limiting plates, the sensing face of the pressure sensor assembly 11 faces one end face limiting plate, the other face opposite to the sensing face faces the other end face limiting plate, and the distance between the two end face limiting plates is larger than the height of the pressure sensor assembly 11 inserted into the limiting groove part so as to form a floating gap.

In one embodiment, the end limiting plate is detachably connected to the side limiting plate or the wall of the inner cavity of the box body, so as to facilitate the installation of the pressure sensor assembly 11.

In the above embodiments, the sensor support 14 is disposed in the inner cavity of the case, the sensor support 14 has a matching surface matching with the pressure sensor assembly 11, the pressure sensor assembly 11 is mounted on the matching surface through the limiting assembly, the sensor support 14 is provided with a support through hole, and the syringe piston rod directly passes through the support through hole to act on the sensing surface of the pressure sensor assembly 11 or the force transmission member 13 passes through the support through hole to act on the sensing surface of the pressure sensor assembly 11. The pressure sensor assembly 11 is conveniently mounted by the provision of the sensor mount 14. The matching surface of the sensor support 14 plays a limiting role on one side of the pressure sensor assembly 11 along the stress direction, and the limiting assembly plays a limiting role on the other side, so that the pressure sensor assembly 11 is movably mounted in the stress direction. The support is provided with a support through hole, and the piston rod of the syringe can directly pass through the support through hole to act on the sensing surface of the pressure sensor assembly 11, or the force transmission piece 13 passes through the support through hole to act on the sensing surface of the pressure sensor assembly 11.

The force transmission member 13 is limited in the window and moves along the force-receiving direction when receiving the direct acting force of the syringe piston rod, so as to contact the sensing surface of the pressure sensor assembly 11, and the limiting assembly adopts the screw 12 in the above embodiment as an example, a threaded hole is formed on the mating surface, the pressure sensor assembly 11 is in threaded connection with the mating surface through the screw 12, a floating gap is formed between the positioning surface of the head 121 of the screw 12 facing the pressure sensor assembly 11 and the mating surface of the head 121 of the pressure sensor assembly 11 facing the screw 12, that is, a floating space of the pressure sensor assembly 11 is formed between the positioning surface of the head 121 of the screw 12 facing the pressure sensor assembly 11 and the mating surface of the sensor support 14. The pressure of the syringe piston rod pushes the force transmission piece 13 to pass through the through hole of the support to move along the force-bearing direction and contact the sensing surface of the pressure sensor assembly 11. In case the force transmitter 13 comprises a mounting part 131 for abutting against the syringe piston rod and a cylindrical probe 132 fixedly connected to the mounting part 131, the cylindrical probe 132 passes through the holder through hole to contact the sensing surface. When the column probe 132 is a cylinder, for better limiting the force transmission member 13, the force transmission member 13 further includes a column-shaped limiting portion 123 fixedly connected to the mounting portion 131, a limiting hole is correspondingly formed in the sensor support 14, and the column-shaped limiting portion 123 is inserted into the limiting hole, so that the force transmission member 13 is prevented from rotating.

In one embodiment, the sensor holder 14 is of one-piece construction with the body of the push-pull box 15. Such as the sensor support 14 being of one-piece construction with the cartridge body. According to the requirement, the sensor support 14 and the box body of the push-pull box 15 can also be in a split structure, and the sensor support 14 and the box body are fixedly connected, for example, connected through the screw 12.

The present application further provides an infusion pump, which in one embodiment is configured for use with an infusion tube, comprising a pump body, a peristaltic displacement mechanism, a slider, a pressure sensor assembly 11, and a processor. Referring to fig. 4, fig. 4 is a schematic cross-sectional view illustrating an installation manner of a pressure sensor assembly of an infusion pump according to an embodiment of the present invention.

The pump main body 25 is internally provided with a pump main body inner cavity and a window communicated with the pump main body inner cavity; the peristaltic extrusion mechanism is positioned in the inner cavity of the pump main body and extrudes the infusion tube; the slide block 23 is limited and connected to the window of the pump main body 25 through the limiting component, the slide block 23 can slide in the window of the pump main body 25 along the central axis direction of the window, and the slide block 23 is positioned on the first surface of the window and contacts the infusion tube. The peristaltic squeezing mechanism squeezes the infusion tube, when the pressure in the infusion tube rises, the infusion tube is in contact with the first surface of the window, which is positioned on the sliding block 23, the pressure of the infusion tube is transmitted to the sliding block 23, and the sliding block 23 is pushed to slide along the central axis direction of the window. For the structure and the working principle of the peristaltic squeezing mechanism, please refer to the corresponding arrangement in the existing infusion pump, which is not described herein again.

The shape of the inner cavity of the pump body is set according to the needs and is not particularly limited herein. The pressure sensor assembly 21 is installed in the inner cavity of the pump main body through a limiting assembly, and when the pressure sensor assembly 21 receives direct acting force from the sliding block 23 or indirect acting force from the sliding block 23, the pressure sensor assembly 21 moves along the force receiving direction. That is, the pressure sensor assembly 21 is installed in a floating manner in the force receiving direction, and when receiving a direct acting force from the slider 23 or an indirect acting force from the slider 23, the pressure sensor assembly 21 moves in the force receiving direction, and when moving to the limited position assembly or the support of the pump main body 25, that is, the pressure sensor assembly 21 moves to the floating limit position in a force receiving manner, the pressure of the slider 23 is directly or indirectly transmitted to the sensing surface of the pressure sensor assembly 21, and the pressure sensor assembly 21 converts the acting force received by the sensing surface into an electric signal and sends the electric signal to the processor. The structure, operation principle, and the like of the pressure sensor module 21 can be referred to the prior art. Specifically, the pressure sensor assembly 21 may be a strain gauge pressure sensor assembly, a piezoelectric pressure sensor assembly, or the like.

Wherein the direct force from the slider 23 is a force applied by the slider 23 directly contacting the pressure sensor assembly 21, and wherein the indirect force from the slider 23 is a force applied by the slider 23 to the pressure sensor assembly 21 through the force transmission member.

When the infusion pump is used, the infusion tube is arranged on the infusion pump, the sliding block 23 is directly or indirectly acted on the sensing surface of the pressure sensor assembly 21 by the pressure of the infusion tube, so that the pressure sensor assembly 21 is stressed to move, and the pressure of the infusion tube on the sliding block 23 can be directly or indirectly transmitted to the sensing surface of the pressure sensor assembly 21 from the time of moving to the floating limit position, so that the pressure detection in the infusion tube is realized. Specifically, the effect of the pressure sensor assembly 21 being forced to move within the floating gap on the pressure detection can be counteracted by a backlash elimination algorithm of the controller.

It should be noted that, for convenience of description, the floating direction of the pressure sensor assembly 21 is referred to as the up-down direction and the floating direction perpendicular to the up-down direction is referred to as the horizontal direction, and the up-down direction and the horizontal direction refer to opposite directions and are not used as a limitation on the actual direction of the infusion pump during use.

Use the embodiment of the utility model provides an infusion pump, install the transfer line on pump main part 25, pressure sensor module 21 passes through spacing unit mount in pump main part inner chamber, slider 23 receives the pressure of transfer line and directly or indirectly acts on when pressure sensor module 21's response face, pressure sensor module 21 removes along the atress direction, and after removing to unsteady extreme position, slider 23 receives the pressure of transfer line and can directly or indirectly transmit to pressure sensor module 21's response face, pressure sensor module 21 converts the effort that its response face received into the signal of telecommunication and gives the treater, realize pressure detection. Because the pressure sensor assembly 21 is installed in a floating manner in the stress direction, initial stress cannot be generated due to fixed installation, adverse effects of the initial stress caused by direct fixed installation on the sensitivity and the precision of the pressure sensor assembly 21 are avoided, and the sensitivity and the detection precision of the pressure sensor assembly 21 are improved.

Specifically, the force transmission member is located between the slider 23 and the pressure sensor assembly 21, and moves along the force-receiving direction when receiving the direct force of the slider 23, so as to contact the sensing surface of the pressure sensor assembly 21. I.e. the sensing surface of the pressure sensor assembly 21 faces the force transmitter. When the transfer line was installed on the transfer pump, the pressure of transfer line acted on slider 23, and slider 23 atress slides along the atress direction, and slider 23 transmits power to force transmission piece, and force transmission piece atress removes with the response face of contact pressure sensor subassembly 21 to pressure sensor subassembly 21 converts the effort that the response face received into the signal of telecommunication and sends the treater. At the same time, the pressure sensor assembly 21 is fixed by the pressure action of the force transmitter. The slide block 23 is transmitted to the sensing surface of the pressure sensor component 21 by the pressure of the infusion tube through the force transmission piece, namely the sensing surface is directly matched with the force transmission piece, so that the pressure sensor component 21 and the like can be conveniently distributed in the inner cavity of the pump main body.

Specifically, the force transmission piece includes the installation department that offsets with slider 23 and the column probe of being connected with installation department fixed, and the column probe contacts with the response face in order to receive the pressure transmission of transfer line to the response face with slider 23.

According to the requirement, the sensing surface of the pressure sensor assembly 21 can also face away from the sliding block 23, the force transmission piece comprises a pushing piece which is abutted against the sliding block 23 and a sensing part which faces the sensing surface in the inner cavity of the pump main body, and the pushing piece moves along the stress direction when being acted by the pressure of the sliding block 23, so that the sensing surface of the pressure sensor assembly 21 contacts the sensing part and can move to the floating limit position under the pushing of the sensing part, and the pressure of the infusion tube on the sliding block 23 is detected.

Specifically, the sensing surface, the force transmission member and the window of the pressure sensor assembly 21 are arranged along a straight line. That is, the force transmission member directly and linearly transmits the pressure of the infusion tube on the slide block 23 to the sensing surface along the pressure direction through the window, so that the sensing surface detects the pressure of the infusion tube on the slide block 23. According to the requirement, such as the space layout in the inner cavity of the pump main body and the like, the sensing surface, the force transmission piece and the window can be not in the same straight line. If the force transmission member is of a broken line type, the end of one broken line segment is abutted against the slide block 23, and the end of the other broken line segment is used for contacting with the sensing surface.

The pressure sensor assembly 21 is floatingly mounted within the pump body cavity by a stop assembly, which in one embodiment comprises a screw 22, with a floating gap between a locating surface of the head 221 of the screw 22 facing the pressure sensor assembly 21 and a mating surface of the pressure sensor assembly 21 facing the head 221 of the screw 22. That is, the pressure sensor module 21 is installed in the pump main body cavity by the screw 22, the end surface of the head 221 of the screw 22 facing the pressure sensor module 21 is a positioning surface, the pressure sensor module 21 has a mating surface facing the head 221 of the screw 22, and a floating gap is formed between the positioning surface and the mating surface. The screw 22 is in threaded fit with the pump main body 25, the pump main body 25 has an end face which faces one end of the pressure sensor assembly 21 away from the head 221 of the screw 22 and limits the position, the thickness between the matching face of the pressure sensor assembly 21 facing the head 221 of the screw 22 and the matching face facing the end face is smaller than the distance between the positioning face of the head 221 of the screw 22 facing the pressure sensor assembly 21 and the end face of the pump main body 25 facing one end of the pressure sensor assembly 21 away from the head 221 of the screw 22 and limiting the position, and the difference between the two distances is the size of the floating gap of the pressure sensor assembly 21. The floating gap may be set to 0.1mm specifically as required. When the pressure sensor assembly 21 is not subjected to the direct acting force or the indirect acting force of the sliding block 23, the pressure sensor assembly 21 can float up and down in the floating gap, so that the initial stress caused by the fixed installation cannot be generated.

When the sensing surface faces the slider 23, the slider 23 is acted on the sensing surface of the pressure sensor assembly 21 by the pressure of the infusion tube, the pressure sensor assembly 21 moves along the force-receiving direction, and when the pressure sensor assembly 21 moves to the state that the matching surface facing the head 221 of the screw 22 of the pressure sensor assembly 21 is abutted against the positioning surface facing the pressure sensor assembly 21 by the head 221 of the screw 22, the slider 23 is transmitted to the sensing surface of the pressure sensor assembly 21 by the pressure of the infusion tube, and the pressure sensor assembly 21 converts the acting force received by the sensing surface into an electric signal and transmits the electric signal to the processor, so that the pressure detection is realized.

Specifically, a sensor through hole is formed in the pressure sensor assembly 21, and the rod portion of the screw 22 includes a limiting portion 222 matched with the sensor through hole and a threaded portion 223 in threaded connection with the pump main body 25. The screw 22 passes through the sensor through hole, and the head 221 of the screw 22 can limit the vertical floating of the pressure sensor assembly 21 and also limit the horizontal displacement of the pressure sensor assembly 21. The depth of the through hole is smaller than the distance from the end surface of the head 221 of the screw 22 opposite to the pressure sensor assembly 21 to the end surface of the pump body 25 opposite to the pressure sensor assembly 21, that is, the length of the limiting part 222 is larger than the depth of the sensor through hole. The specific difference is the floating gap size of the pressure sensor assembly 21.

In one embodiment, the sensor through hole comprises a circular hole. The rod of the screw 22 passes through the circular hole to limit the pressure sensor assembly 21 and is in threaded connection with the pump body 25. The limiting part 222 of the rod part of the screw 22 can be correspondingly set to be a round rod, the size of the round rod is matched with that of the round hole, and the limiting part plays a role in guiding the up-and-down floating of the pressure sensor assembly 21 while limiting the pressure sensor assembly in the horizontal direction.

In one embodiment, at least two circular holes are provided in the pressure sensor assembly 21. Through the setting of two at least round holes, with it the complex carry on spacingly with pressure sensor subassembly 21 through two at least screws 22, then pressure sensor subassembly 21 is injectd at the displacement of horizontal direction, therefore can guarantee pressure sensor subassembly 21's response face position to the pressure of accurate measurement transfer line. The limitation of the horizontal displacement of the pressure sensor assembly 21 can also be realized by the cooperation of the horizontal limiting component and the single round hole with the screw 22 according to the requirement.

In one embodiment, the pressure sensor assembly 21 is provided with a special-shaped hole, and the limiting portion 222 engaged with the special-shaped hole is a special-shaped portion having the same cross-sectional shape as the special-shaped hole. The sensor through hole is a special-shaped hole, the limiting part 222 of the screw 22 is a special-shaped part with the same shape, the special-shaped part penetrates through the special-shaped hole, and one special-shaped hole can limit the rotation of the screw 22 in the horizontal direction. According to the needs, in order to improve spacing reliability, can also add the round hole on the basis of a special-shaped hole.

Pressure sensor subassembly 21 floats through spacing subassembly and installs in pump main part intracavity, and in another embodiment, spacing subassembly is including being fixed in the pump main part intracavity and being used for restricting the side limiting plate of pressure sensor subassembly 21 displacement all around and the terminal surface limiting plate of restriction pressure sensor subassembly 21 in the direction of force position, and the terminal surface limiting plate has the clearance of floating between the fitting surface of the locating surface of pressure sensor subassembly 21 orientation pressure sensor subassembly 21 and the pressure sensor subassembly 21 orientation terminal surface limiting plate. That is, the horizontal displacement of the pressure sensor assembly 21 is limited by the side limiting plate to ensure the horizontal position of the sensing surface. The stress direction displacement of the pressure sensor assembly 21 is limited through the end face limiting plate, specifically, the end face limiting plate is fixedly connected to the top end of the side limiting plate and surrounds the side limiting plate and the pump main body 25 to form a mounting groove, and then the end of the pressure sensor assembly 21 is inserted into the limiting groove for mounting. The height of the part, inserted into the limiting groove, of the pressure sensor assembly 21 is smaller than that of the mounting groove, and the height difference between the height of the pressure sensor assembly 21 and the height of the limiting groove is the size of the floating gap of the pressure sensor assembly 21. According to the requirement, the floating gap type pressure sensor assembly can also comprise two end face limiting plates which are oppositely arranged, the end part of the pressure sensor assembly 21 is inserted between the two end face limiting plates, the sensing face of the pressure sensor assembly 21 faces one end face limiting plate, the other face opposite to the sensing face faces the other end face limiting plate, and the distance between the two end face limiting plates is larger than the height of the pressure sensor assembly 21 inserted into the limiting groove part so as to form a floating gap.

In one embodiment, the end stop plate is removably attached to the side stop plate or pump body 25 to facilitate installation of the pressure sensor assembly 21.

In the above embodiments, the sensor support 24 is disposed in the inner cavity of the pump body, the sensor support 24 has a matching surface matching with the pressure sensor assembly 21, the pressure sensor assembly 21 is mounted on the matching surface through the limiting assembly, the sensor support 24 is provided with a support through hole, and the slider 23 directly passes through the support through hole to act on the sensing surface of the pressure sensor assembly 21 or the force transmission member passes through the support through hole to act on the sensing surface of the pressure sensor assembly 21. The pressure sensor assembly 21 is conveniently mounted by the provision of the sensor mount 24. The matching surface of the sensor support 24 plays a limiting role on one side of the pressure sensor assembly 21 along the stress direction, and the limiting assembly plays a limiting role on the other side, so that the pressure sensor assembly 21 is movably mounted in the stress direction. The support is provided with a support through hole, so that the sliding block 23 can directly pass through the support through hole to act on the sensing surface of the pressure sensor assembly 21, or the force transmission piece passes through the support through hole to act on the sensing surface of the pressure sensor assembly 21.

When the sensing surface of the pressure sensor module 21 receives the direct acting force from the slider 23, the sensing surface moves along the force receiving direction to contact the sensing surface of the pressure sensor module 21, and the limiting module is exemplified by the screw 22 in the above embodiment, a threaded hole is formed in the mating surface, the pressure sensor module 21 is in threaded connection with the mating surface through the screw 22, a floating gap is formed between the positioning surface of the head 221 of the screw 22 facing the pressure sensor module 21 and the mating surface of the pressure sensor module 21 facing the head 221 of the screw 22, that is, a floating space of the pressure sensor module 21 is formed between the positioning surface of the head 221 of the screw 22 facing the pressure sensor module 21 and the mating surface of the sensor support 24. The slide block 23 is pressed by the infusion tube, penetrates through the through hole of the support and moves along the stress direction, and contacts with the sensing surface of the pressure sensor component 21.

In one embodiment, the sensor mount 24 is a unitary structure with the pump body 25. Such as sensor mount 24, is integrally formed with pump body 25. If necessary, the sensor holder 24 and the pump body 25 may be separate structures, and the sensor holder 24 and the pump body 25 are fixedly connected, for example, by the screws 22.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The injection pump is characterized by being used for being matched with an injector for use and comprising a pump body, a transmission assembly, a push-pull box and a processor, wherein the pump body is used for driving the push-pull box to do linear motion through the transmission assembly under the driving of the processor; the push-pull box is provided with a box body inner cavity and a window penetrating through the box body inner cavity, and the push-pull box further comprises a pressure sensor assembly and a limiting assembly which are arranged in the box body inner cavity; the pressure sensor assembly is used for converting the acting force on the sensing surface of the pressure sensor assembly into an electric signal and sending the electric signal to the processor; the pressure sensor subassembly passes through spacing subassembly and installs intracavity in the box body, and when the response face receives and comes from the direct effort of syringe piston rod or come from when the indirect effort of syringe piston rod, the pressure sensor subassembly moves along the atress direction, wherein comes from the direct effort of syringe piston rod is syringe piston rod direct contact pressure sensor subassembly and the application of force, wherein comes from the indirect effort of syringe piston rod is the syringe piston rod passes through the power transmission piece and applies the power for the pressure sensor subassembly.

2. The syringe pump of claim 1, wherein the force transmitter is confined within the window and moves in the force direction to contact the sensing surface of the pressure sensor assembly when subjected to a direct force of the syringe plunger rod.

3. The syringe pump of claim 2, wherein the sensing surface of the pressure sensor assembly, the force transmitter, and the window are along a straight line.

4. The syringe pump of claim 1, further comprising a waterproof membrane sealing between the force transmitter and the window.

5. The syringe pump of any of claims 1-4, wherein the limiting assembly comprises a screw having a floating gap between a locating surface of a head of the screw facing the pressure sensor assembly and a mating surface of the pressure sensor assembly facing the head of the screw.

6. The syringe pump of claim 5, wherein the pressure sensor assembly is provided with a sensor through hole, and the rod part of the screw comprises a limiting part matched with the sensor through hole and a threaded part in threaded connection with the wall surface of the inner cavity of the box body.

7. The syringe pump of claim 6, wherein the sensor through-hole comprises a circular hole.

8. The syringe pump of claim 7, wherein the pressure sensor assembly has at least two of the circular holes disposed thereon.

9. The syringe pump of claim 6, wherein the sensor through-hole comprises a profiled hole having a non-circular cross-section.

10. The syringe pump of claim 9, wherein the non-circular pattern is a polygon or an ellipse.

11. The syringe pump of claim 9, wherein the pressure sensor assembly is provided with one of the profiled holes, and the stopper portion engaged with the profiled hole is a profiled portion having the same cross-sectional shape as the profiled hole.

12. The injection pump according to any one of claims 1 to 4, wherein the limiting assembly comprises a side limiting plate fixed in the inner cavity of the box body for limiting the circumferential displacement of the pressure sensor assembly and an end surface limiting plate for limiting the position of the pressure sensor assembly in the force direction, and a floating gap is formed between a positioning surface of the end surface limiting plate facing the pressure sensor assembly and a matching surface of the pressure sensor assembly facing the end surface limiting plate.

13. The injection pump according to any one of claims 1 to 4, wherein a sensor support is provided in the inner cavity of the case, the sensor support has a fitting surface fitted with the pressure sensor assembly, the pressure sensor assembly is mounted on the fitting surface through the limiting assembly, a support through hole is provided on the sensor support, and the syringe piston rod directly passes through the support through hole to act on the sensing surface of the pressure sensor assembly or the force transmission member passes through the support through hole to act on the sensing surface of the pressure sensor assembly.

14. The syringe pump of claim 13, wherein the sensor mount is a unitary structure with the body of the push-pull cassette.

15. The syringe pump of claim 14, wherein the sensor mount and the cartridge body of the push-pull cartridge are separate structures, and the sensor mount is fixedly connected to the cartridge body.

16. An infusion pump is used in cooperation with an infusion tube and is characterized by comprising a pump main body, a peristaltic extrusion mechanism, a sliding block, a pressure sensor assembly and a processor, wherein the pump main body is internally provided with a pump main body inner cavity and a window communicated with the pump main body inner cavity; the peristaltic extrusion mechanism is positioned in the inner cavity of the pump main body and extrudes the infusion tube; the sliding block is limited and connected in a window of the pump main body through a limiting component, the sliding block can slide in the window of the pump main body along the central axis direction of the window, and the sliding block is positioned on a first surface of the window and contacts the infusion tube; the pressure sensor assembly is used for converting the acting force on the sensing surface of the pressure sensor assembly into an electric signal and sending the electric signal to the processor; the pressure sensor assembly is installed in the inner cavity of the pump main body through a limiting assembly, and when the sensing surface is subjected to direct acting force from the sliding block or indirect acting force from the sliding block, the pressure sensor assembly moves along a force-bearing direction, wherein the direct acting force from the sliding block is force applied by the sliding block in direct contact with the pressure sensor assembly, and the indirect acting force from the sliding block is force applied to the pressure sensor assembly by the sliding block through a force transmission piece.

17. The infusion pump of claim 16, wherein said force transmitter is located between said slider and said pressure sensor assembly and moves in said force receiving direction to contact a sensing surface of said pressure sensor assembly when directly acted upon by said slider.

18. The infusion pump of claim 16, wherein said sensing surface of said pressure sensor assembly, said force transmitting member and said window are disposed along a straight line.

19. The infusion pump according to any one of claims 16-18, wherein said stop assembly comprises a screw having a floating gap between a locating surface of a head of said screw facing said pressure sensor assembly and a mating surface of said pressure sensor assembly facing said head of said screw.

20. The infusion pump according to claim 19, wherein the pressure sensor assembly has a sensor through hole formed therein, and the shaft portion of the screw includes a stopper portion engaged with the sensor through hole and a threaded portion threadedly coupled with the pump body.

21. The infusion pump of claim 20, wherein said sensor through hole comprises a circular hole.

22. The infusion pump of claim 21, wherein said pressure sensor assembly has at least two said circular holes disposed therein.

23. The infusion pump of claim 20, wherein said sensor through-holes comprise profiled holes having a non-circular cross-section.

24. The infusion pump according to claim 23, wherein said non-rotating figure is a polygon or an ellipse.

25. The infusion pump according to claim 23, wherein said pressure sensor unit is provided with one of said shaped holes, and said position-limiting portion engaged with said shaped hole is a shaped portion having the same cross-sectional shape as said shaped hole.

26. The infusion pump according to any one of claims 16 to 18, wherein the limiting assembly comprises a side limiting plate fixed in the inner cavity of the pump body for limiting the circumferential displacement of the pressure sensor assembly and an end surface limiting plate for limiting the position of the pressure sensor assembly in the force-bearing direction, and a floating gap is formed between a positioning surface of the end surface limiting plate facing the pressure sensor assembly and a matching surface of the pressure sensor assembly facing the end surface limiting plate.

27. An infusion pump according to any one of claims 16 to 18, wherein a sensor holder is provided in the inner cavity of the pump body, the sensor holder has a fitting surface for fitting with the pressure sensor module, the pressure sensor module is mounted on the fitting surface via the limiting module, a holder through hole is provided in the sensor holder, and the slider directly passes through the holder through hole to act on the sensing surface of the pressure sensor module or the force transmission member passes through the holder through hole to act on the sensing surface of the pressure sensor module.

28. The infusion pump of claim 27, wherein said sensor mount is a unitary structure with said pump body.

29. The infusion pump of claim 27, wherein said sensor mount is a separate structure from said pump body and said sensor mount is fixedly attached to said pump body.