CN217525951U

CN217525951U - Injection pump

Info

Publication number: CN217525951U
Application number: CN202220813879.1U
Authority: CN
Inventors: 吴张龙; 胡颖英; 李晓维; 龙建梁
Original assignee: Shenzhen Comen Medical Instruments Co Ltd
Current assignee: Shenzhen Comen Medical Instruments Co Ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-10-04
Anticipated expiration: 2032-04-08

Abstract

The utility model provides an injection pump, this injection pump includes: the device comprises a machine body, a driving mechanism, a transmission mechanism and a pushing and clamping mechanism, wherein the driving mechanism is used for generating driving force; the transmission mechanism comprises a sliding screw rod processed by adopting a thread rolling process and a moving assembly matched with the sliding screw rod, the moving assembly can move along the sliding screw rod, and the sliding screw rod is connected to the driving structure and rotates under the driving of the driving structure; the pushing and clamping mechanism is connected with the moving assembly and is used for realizing linear reciprocating motion under the driving of the moving assembly so as to push the injector. When the injection pump is used for injecting the medicine, the flow velocity fluctuation in the injection process is small, and the stability and the injection precision of medicine injection can be ensured.

Description

Injection pump

Technical Field

The utility model relates to the field of medical equipment, especially, relate to an injection pump.

Background

In clinical medicine, in order to ensure continuous and stable infusion during drug injection and the precision of drug injection, a syringe pump is generally used for injection.

The injection pump converts the rotary motion of the screw rod into linear motion by utilizing a nut matched with the screw rod to push the piston to complete medicine injection, and the screw rod used by the injection pump in the prior industry is processed by adopting the traditional threading process. For the traditional threading process, the machining precision of a machine tool is difficult to control in the machining process, so that the surface smoothness of a screw rod is difficult to ensure, however, the surface smoothness of the screw rod used in a transmission system of an injection pump is not high, great flow rate fluctuation is generated in the injection process of the medicine, and the surface smoothness of the screw rod also influences the injection precision of the medicine.

SUMMERY OF THE UTILITY MODEL

The utility model provides an injection pump for solve the injection velocity of flow that current injection pump exists unstable, the not high problem of injection precision.

The utility model provides an injection pump, include:

a body;

a drive mechanism for generating a drive force;

the transmission mechanism comprises a sliding screw rod processed by adopting a thread rolling process and a moving assembly matched with the sliding screw rod, the moving assembly can move along the sliding screw rod, and the sliding screw rod is connected to the driving structure and driven by the driving structure to rotate;

and the pushing clamping mechanism is connected with the moving assembly and is used for realizing linear reciprocating motion under the driving of the moving assembly so as to push the injector.

As a further alternative of the syringe pump, the drive mechanism comprises a motor and a speed reduction assembly, the speed reduction assembly being provided at the output of the motor to achieve the required rotational speed of the sliding screw.

As a further alternative of the syringe pump, the moving assembly includes a nut disposed inside the slider, the nut being engaged with the slide screw, and a slider to which the push clamp mechanism is attached.

As a further alternative of said one syringe pump, said nut is of a fully encircling construction, said nut being a structurally complete nut that fully envelops said sliding screw, converting the rotational movement of said sliding screw into a linear movement.

As a further alternative of the injection pump, the nut is of a half-surrounding structure, a notch is formed in the nut, the sliding screw rod is half-surrounded by the notched nut, and the nut can be pushed open by external force to be disengaged from the sliding screw rod.

As a further alternative of the injection pump, the pushing clamping mechanism comprises a push rod, a push head and a clamping jaw, the push rod is connected with the sliding block and the push head, and the push rod pushes the push head to do linear reciprocating motion under the driving of the sliding block.

As a further alternative to the one syringe pump, the gripping jaws are provided on the opposite side of the pusher head to the plunger shank of the syringe, the gripping jaws being adapted to grip the plunger shank.

As a further alternative of the injection pump, the pushing and clamping mechanism further comprises a knob, the knob is arranged on one side of the pushing head, which is far away from the piston handle, the knob is in transmission connection with the nut with the notch, and the nut can be driven to open by controlling the knob.

As a further alternative to the one syringe pump, the body is provided with a slot for mounting a syringe and a clamp for clamping the syringe on one side of the slot.

As a further alternative of the injection pump, a light blocking sheet and a photoelectric sensor are arranged in the machine body, the light blocking sheet and the photoelectric sensor are used for detecting the distance between the piston handle and the pushing head, the pushing head is provided with a force conducting piece and a pressure sensor, and the force conducting piece and the pressure sensor are used for judging the abutting state between the pushing head and the piston handle.

Adopt the utility model discloses, following beneficial effect has:

according to the utility model discloses the syringe pump that the embodiment provided provides above, this syringe pump mainly includes the organism, actuating mechanism, drive mechanism and promotion fixture, this actuating mechanism produces drive power, drive mechanism will drive power transmission to promotion fixture, it carries out the medicine injection to promote fixture drive syringe, wherein the syringe pump improves drive mechanism, the slip lead screw that adopts the thread rolling technology to process is replaced into to the lead screw in with drive mechanism, make the slip lead screw have ball screw's high accuracy characteristic, use this kind of slip lead screw that has the high accuracy and move the mutually supporting of subassembly and carry out the transmission, the transmission process is steady, the stationarity of medicine injection has been ensured, higher injection precision has.

Drawings

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

Wherein:

fig. 1 is a schematic view of the general assembly syringe pump of the present invention.

Fig. 2 is a schematic view of the transmission mechanism of the injection pump of the present invention.

Fig. 3 is a schematic view of a screw rod thread rolling process.

Fig. 4 is a schematic view of the syringe after the plunger shaft abuts the pusher.

FIG. 5 illustrates the use and non-use of auto-elimination gaps graph comparing the change in infusion pump flow rate for the algorithm.

Fig. 6 is a schematic flow chart of automatically eliminating the mechanical clearance between the piston handle and the push head.

Description of the main element symbols:

body-100; a slot-110; a clamp-120; a drive mechanism-200; a motor-210; -a speed reduction assembly-220; transmission-300; a sliding screw rod-310; a slider-320; pushing the clamping mechanism-400; a push rod-410; a push head-420; a jaw-430; knob-440; -500 a workpiece; a thread rolling wheel-600; syringe-700; piston shank-710.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides an injection pump, this injection pump have mainly solved the problem that the injection pump that uses traditional drive mechanism exists when the medicine is injected through drive mechanism 300's improvement, use this injection pump to carry out the medicine injection, and the injection process is steady, the injection precision is high.

In the embodiment of the present invention, referring to fig. 1-2, the syringe pump mainly includes a body 100, a driving mechanism 200, a transmission mechanism 300, and a pushing and clamping mechanism 400.

The driving mechanism 200 is used for generating a driving force;

the transmission mechanism 300 comprises a sliding screw rod 310 processed by adopting a thread rolling process and a moving assembly matched with the sliding screw rod 310, wherein the moving assembly can move along the sliding screw rod 310, and the sliding screw rod 310 is connected to a driving structure and rotates under the driving of the driving structure;

the pushing clamping mechanism 400 is connected to the moving component, and is used for realizing linear reciprocating motion under the driving of the moving component so as to push the syringe 700.

Unlike the conventional transmission mechanism of a syringe pump, the sliding screw 310 used in the transmission mechanism 300 of the embodiment of the present invention is not processed by the conventional threading process but by the thread rolling process. Compared with the screw rod processed by the traditional threading process, the sliding screw rod 310 processed by the thread rolling process has the characteristics of long surface fatigue life and high precision caused by the thread rolling process.

The principle of the thread rolling process for machining the sliding screw 310 is shown in fig. 3: the two thread rolling wheels 600 with a certain angle are adjusted to a proper processing distance according to the size of the workpiece 500, then the workpiece 500 is placed between the two thread rolling wheels 600 and is axially parallel to one of the thread rolling wheels 600, the two thread rolling wheels 600 with a certain angle synchronously rotate in the same direction to extrude the workpiece 500, and the workpiece 500 is subjected to plastic deformation under the extrusion of the two thread rolling wheels 600 so as to form an external thread profile on the surface. At least one of the two thread rolling wheels 600 performs radial extrusion on the workpiece 500 and performs axial feed motion, and the workpiece 500 axially moves relative to the thread rolling wheels 600 under the axial driving of the thread rolling wheels 600, so that the surface of the whole workpiece 500 forms an external thread profile.

Therefore, the transmission mechanism 300 consisting of the sliding screw rod 310 with high surface smoothness and the moving assembly processed by the thread rolling process can stably transmit the driving force generated by the driving mechanism 200 to the pushing clamping mechanism 400 to drive the pushing clamping mechanism 400 to perform linear reciprocating motion so as to push the injector 700, and the sliding screw rod 310 with high surface smoothness is used for transmission so as to ensure that the injection pump cannot generate large flow rate fluctuation in the injection process, the injection process is stable, and the injection pump has high injection precision.

In one embodiment, the driving mechanism 200 includes a motor 210 and a speed reduction assembly 220, wherein the speed reduction assembly 220 is disposed at an output end of the motor 210 to achieve a desired rotation speed of the sliding screw 310.

The speed reduction assembly 220 is arranged at the output end of the motor 210, so that the high rotating speed output by the motor 210 is reduced to reach the rotating speed required by the sliding screw rod 310, and the injection pump can smoothly inject the medicine.

In one embodiment, the moving assembly includes a nut disposed inside the sliding screw 310 and engaged with the sliding screw 310, and a slider 320, which pushes the clamping mechanism 400 to be coupled to the slider 320.

It should be noted that the nut (not shown) does not include a ball, but is engaged with the sliding screw 310 on the thread, and by arranging the nut inside the sliding block 320, the internal thread of the nut is engaged with the thread on the surface of the sliding screw 310, and the sliding screw 310 is driven by the motor 210 to rotate, so as to drive the nut to move on the sliding screw 310, and further drive the sliding block 320 in which the nut is arranged to move.

In one specific embodiment, the nut is a fully encircling nut that is a structurally complete nut that fully encompasses the sliding screw 310, converting the rotational motion of the sliding screw 310 into a linear motion.

It should be noted here that the nut with a complete structure is suitable for the case that the injector 700 can be automatically loaded, the nut with a complete structure is engaged on the sliding screw rod 310, and the nut with a complete structure linearly moves on the sliding screw rod 310 by means of the thread under the rotation of the sliding screw rod 310, so as to convert the rotation into a linear motion, and therefore, the slider 320 connected with the nut can perform a linear motion, and the nut with a complete structure is adopted to cooperate with the sliding screw rod 310, and only the motor 210 needs to be started, so as to drive the slider 320 to move, thereby pushing the clamping mechanism 400 to automatically load the injector 700.

In another specific embodiment, the nut is a half-surrounding structure, and the nut is provided with a notch, and the notched nut half-surrounds the sliding screw 310, so that the nut can be pushed open by external force to be disengaged from the sliding screw 310.

It should be noted here that the notched nut is suitable for use in the case of a syringe 700 that is manually loaded. When the syringe 700 is loaded manually, an external force is applied to the nut, the nut is pushed open from the opened notch, the nut is disengaged from the sliding screw 310, and at the moment, the clamping mechanism 400 is pushed manually to load the syringe 700.

In one embodiment, the pushing clamping mechanism 400 includes a pushing rod 410, a pushing head 420 and a clamping jaw 430, the pushing rod 410 connects the sliding block 320 and the pushing head 420, and the pushing rod 410 pushes the pushing head 420 to reciprocate linearly under the driving of the sliding block 320.

In one particular embodiment, jaws 430 are disposed on a side of pusher head 420 opposite plunger shaft 710 of syringe 700, and jaws 430 are configured to grip plunger shaft 710.

Piston handle 710 is held without positional deviation by the design of clamping jaws 430, and push head 420 can push piston handle 710 precisely to inject medicine.

In one embodiment, the pushing clamping mechanism 400 further includes a knob 440, the knob 440 is disposed on a side of the pushing head 420 away from the piston handle 710, the knob 440 is in transmission connection with a nut having a notch, and the knob 440 is operated to drive the nut to open.

It should be noted here that a metal long shaft is connected between the knob 440 and the nut with the notch, and an ejector pin is disposed at one end of the long shaft close to the nut with the notch, so that when the syringe 700 is manually loaded, the knob 440 is held, and the ejector pin at one end of the long shaft is driven to eject the nut from the notch, and is disengaged from the sliding screw 310.

In one embodiment, body 100 is provided with a slot 110 for mounting syringe 700 and a clamp 120 on one side of slot 110 for clamping syringe 700.

By the dual design of mounting the syringe 700 on the slot 110 and clamping and fixing the syringe 700 by the clamp 120, the syringe 700 is not easily displaced when injecting medicine, which affects medicine injection.

In another embodiment, a light blocking sheet and a photoelectric sensor are disposed in the body 100, the light blocking sheet and the photoelectric sensor are used for detecting a distance between the piston handle 710 and the push head 420, the push head 420 is provided with a force transmitter and a pressure sensor, and the force transmitter and the pressure sensor are used for determining an abutting state between the push head 420 and the piston handle 710.

As shown in fig. 5-6, the photoelectric sensors (not shown in the figures) are disposed on the stroke light plate inside the syringe pump body 100, the number of the photoelectric sensors may be multiple, for example, 6 to 12, or other numbers that need to be set, the specific number of the photoelectric sensors may be set according to actual requirements, the light blocking sheets (not shown in the figures) are disposed on the slider 320 in the body 100, and when the plunger head 420 drives the plunger handle 710 of the syringe 700 to operate, the light blocking sheets passing through the photoelectric sensors are identified, so that the distance between the plunger handle 710 and the plunger head 420 can be detected; when the photoelectric sensor detects that the push head 420 is about to abut against the tail of the piston handle 710, namely, the gap between the push head 420 and the tail of the piston handle 710 is larger than or equal to 2mm, the rotating speed of the motor 210 is reduced, the push head 420 starts to slowly approach the piston handle 710 until the piston handle 710 contacts with a force transmission piece (not shown in the figure) arranged on the push head 420 to generate contact force, the force transmission piece transmits the contact force to the pressure sensor, when the AD value of the pressure sensor reaches a set threshold value from 0 or the rising slope of the pressure reaches the set threshold value, the tail of the piston handle 710 abuts against the force transmission piece without gap, at the moment, the motor 210 is turned off, when the motor 210 is turned on again to enable the motor 210 to rotate at the set rotating speed, the set flow rate can be quickly reached after the injection pump operates, and in order to prevent the accidental overdose amount input caused by the process of automatically eliminating the mechanical gap, the occurrence of the accident can also be prevented by setting the maximum operation time threshold value of the motor 210, in the process of eliminating the mechanical gap, when the pressure measured by the pressure sensor or the motor 210 reaches the set threshold value, the operation time of the motor 210 reaches the set threshold value, the operation of eliminating the mechanical gap is immediately stopped, and the automatic elimination of the mechanical gap is completed.

Therefore, the distance between the piston handle 710 and the push head 420 is accurately detected by the light blocking sheet and the photoelectric sensor, and the abutting state between the push head 420 and the piston handle 710 is accurately judged by the cooperation of the force transmission piece and the pressure sensor, so that the perfect abutting between the push head 420 and the piston handle 710 is realized, the mechanical clearance is automatically eliminated, the time that the flow rate rises to a set value when the injection pump is started is shortened, and the injection pump can reach the set flow rate threshold value in a short time to perform stable medicine injection, thereby being more beneficial to exerting the treatment effect of the medicine.

Get back to the embodiment of the present invention again, take one of them embodiment that the performance is comparatively outstanding as an example, the syringe pump in this embodiment includes organism 100, actuating mechanism 200, drive mechanism 300 and by push rod 410, push head 420 and clamping jaw 430, the promotion fixture 400 that holds between the fingers the handle 440 and constitute, drive mechanism 300 mainly includes sliding screw 310, nut and slider 320, this drive mechanism replaces the lead screw of traditional car silk technology processing with sliding screw 310 that adopts the thread rolling technology processing, make sliding screw 310 have the characteristic of high accuracy, the nut that suits is deuterogamied, the linear motion of slider 320 has both been realized, because sliding screw 310 has had the high accuracy characteristic, the syringe pump medicine injection process is steady, the injection accuracy is high.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A syringe pump, characterized in that it comprises:

a body;

a drive mechanism for generating a drive force;

the transmission mechanism comprises a sliding screw rod processed by adopting a thread rolling process and a moving assembly matched with the sliding screw rod, the moving assembly can move along the sliding screw rod, and the sliding screw rod is connected to the driving mechanism and driven by the driving mechanism to rotate;

2. The syringe pump of claim 1 wherein said drive mechanism includes a motor and a speed reduction assembly disposed at an output of said motor to achieve a desired rotational speed of said slidable screw.

3. The syringe pump of claim 1, wherein the moving assembly comprises a nut and a slider, the nut being disposed within the slider, the nut being in meshing engagement with the sliding lead screw, the push clamp mechanism being coupled to the slider.

4. The syringe pump of claim 3 wherein said nut is of a fully encircling construction, said nut being a structurally complete nut that fully encircles said sliding screw to convert rotational motion of said sliding screw to linear motion.

5. The syringe pump of claim 3, wherein the nut is a half-enclosure structure, the nut having a notch, the notched nut half-enclosing the sliding screw, the nut being capable of being pushed open by an external force to disengage the nut from the sliding screw.

6. The syringe pump of claim 5, wherein the pushing and clamping mechanism comprises a push rod, a push head and a clamping jaw, the push rod is connected with the sliding block and the push head, and the push rod pushes the push head to reciprocate linearly under the driving of the sliding block.

7. The syringe pump of claim 6 wherein said jaws are disposed on an opposite side of said pusher from a plunger shaft of the syringe, said jaws being adapted to grip the plunger shaft.

8. The injection pump according to claim 6, wherein the pushing and clamping mechanism further comprises a knob, the knob is arranged on one side of the pushing head, which is far away from the piston handle, the knob is in transmission connection with the nut with the notch, and the knob is controlled to drive the nut to open.

9. The syringe pump of claim 1, wherein the body is provided with a slot for mounting a syringe and a clamp for clamping the syringe at a side of the slot.

10. The syringe pump of claim 6, wherein a light barrier and a photoelectric sensor are disposed in the housing, the light barrier and the photoelectric sensor are used for detecting a distance between the piston handle and the plunger, the plunger is provided with a force transmitter and a pressure sensor, and the force transmitter and the pressure sensor are used for determining a contact state between the plunger and the piston handle.