Extension mechanism for push rod of injection pump

Abstract

The invention relates to the technical field of medical injection pumps, in particular to an extension mechanism of an injection pump push rod. Comprising an upper shell mounted on the upper surface of the shell and a front shell mounted between the upper shell and a lower shell; the extension assembly is arranged between the lower shell and the upper shell and used for extending the length of the injection pump, the extension assembly comprises a pump body installed between the lower shell and the upper shell and a stepping motor installed on one side wall of the pump body, a driving fluted disc is installed on an output shaft of the stepping motor, and a driven fluted disc is arranged on one side of the driving fluted disc; according to the injection pump, the push rod arm can extend out of the position farther away from the injection pump shell through the extension assembly, a larger operation space is formed, an operator can conveniently use, take and place an injector, cost is low, installation is convenient, a worker can conveniently and rapidly disassemble and assemble the injector through the push-pull box and the rotary pressing handle, working efficiency is high, and practicability is high. Meanwhile, the cross-shaped handle of the injector can be limited, and the stability of the injector during injection is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical injection pumps, and in particular to an extension mechanism for an injection pump push rod. Background Art

[0002] The syringe pump is a precision infusion device, which is widely used in the medical field. The working principle of the syringe pump is to drive the stepper motor to move through the controller, and the motor outputs power to the transmission structure to drive the screw rod and nut to rotate. The nut and the push-pull rod are fixedly connected as one. The push-pull rod is limited by the linear guide rail and can only move linearly along the linear guide rail inside the pump body bracket. In this way, the rotational motion output by the motor shaft is converted into the linear motion of the push-pull rod. The push-pull rod pushes the cross handle of the syringe to move in the syringe barrel to achieve functions such as drug infusion. For example, the existing public document CN105288793B-A clamping and pushing device for a syringe pump and a syringe pump discloses a syringe pump that is easy to operate;

[0003] Although the existing public medical injection pumps can achieve the effect of injection, they still have certain shortcomings in actual use: first, the existing syringe needs to be pressed and clamped on the outside of the injection pump to limit the syringe, which is difficult for staff to operate and is not convenient for quick operation and use; and some existing large-specification syringes from some manufacturers have longer cross handles, and when they extend out of the syringe cavity beyond the nominal range, they usually exceed the measurable range of conventional linear potentiometers, resulting in a small reserved operating space. When operators install the syringe, they are likely to touch the push-pull box or the syringe cross handle, which is inconvenient to operate and affects the operator experience; therefore, it is necessary to improve the existing technology to solve the above technical problems. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the fact that the large-size syringes of some existing manufacturers have longer cross handles, and when they extend out of the syringe cavity beyond the nominal range, they usually exceed the measurable range of the conventional linear potentiometer, resulting in a narrow reserved operating space. Operators are likely to touch the push-pull box or the syringe cross handle when installing the syringe, which is inconvenient to operate and affects the operator experience. An extension mechanism for the syringe pump push rod is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an extension mechanism for an injection pump push rod, comprising a lower housing; an upper housing mounted on the upper surface thereof and a front housing mounted between the upper housing and the lower housing; and an extension assembly arranged between the lower housing and the upper housing for extending the length of the injection pump, the extension assembly comprising a pump body mounted between the lower housing and the upper housing and a stepper motor mounted on a side wall of the pump body, a driving gear disc being mounted on the output shaft of the stepper motor, a driven gear disc being arranged on one side of the driving gear disc, and a rack on the outer wall of the driving gear disc being in contact with the driven gear disc. The rack on the outer wall of the driven gear plate is meshed, and a screw rod is installed at the center position of one end face of the driven gear plate. The other end of the screw rod passes through the bearing on one end face of the pump body and is connected to the threaded groove on one end face of the push rod arm. The external thread on the outer wall of the screw rod is spirally matched with the internal thread on the inner wall of the threaded groove on the push rod arm. The edge of one end of the outer wall of the push rod arm is connected to the second slider through a fixing bolt, and the inner wall of the second slider is slidably connected to the outer wall of the pump body. A push plate is fixed on the outer wall of the second slider, and a potentiometer is provided on one end face of the pump body. The first slider is slidably connected to the outer side of the potentiometer.

[0007] As a preferred solution of the extension mechanism of the injection pump push rod of the present invention, a battery is installed on the inner side wall of the upper shell, and a main control board is installed on one side of the inner side of the lower shell.

[0008] As a preferred solution of the extension mechanism of the injection pump push rod of the present invention, the push plate and the first sliding block are connected by a follower tension spring.

[0009] As a preferred solution of the extension mechanism of the injection pump push rod of the present invention, the front end of the upper surface of the second slider is fixedly connected to the guide shaft, the outer wall of the guide shaft is sleeved with a follower compression spring and a pull rod, and the follower compression spring is located on one side of the pull rod.

[0010] The beneficial effects of the present invention are as follows: by providing an extension component, the push rod arm can be extended to a position further away from the injection pump housing, forming a larger operating space, making it easier for the operator to take and place the syringe, and the cost is low and the installation is convenient.

[0011] In view of the fact that the existing syringe needs to be pressed and clamped on the outside of the injection pump to limit the position of the syringe, and this method is difficult for staff to operate and is not convenient for quick operation and use, a further improvement of the extension mechanism of the injection pump push rod is proposed.

[0012] As a preferred solution of the extension mechanism of the injection pump push rod of the present invention, the push-pull box includes a pressure plate rotatably connected above and below one end surface thereof, and one end surface of the push-pull box is fixedly connected to the outer end of the push rod arm.

[0013] As a preferred solution of the extension mechanism of the injection pump push rod of the present invention, it also includes a rotating pressure handle arranged on the outside of the lower shell and a rotating shaft fixedly connected to the end face of one side of the rotating pressure handle, a torsion spring is sleeved on the outer wall of the rotating shaft, and the other end of the rotating shaft is connected to the potentiometer rotating shaft through a coupling.

[0014] Another beneficial effect of the present invention is that by setting a push-pull box and a rotating pressure handle, the rotating pressure handle is rotated around the rotating shaft under the action of the elastic properties of the torsion spring, and the syringe is installed on the outside of the lower shell, which makes it convenient for the staff to quickly disassemble and assemble the syringe, and the work efficiency is high. At the same time, the pressure plate can be used to press the cross handle on the syringe onto the outer wall of the push-pull box to limit the cross handle of the syringe and increase the stability of the syringe during injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0016] Figure 1 It is a schematic diagram of the overall disassembly of the extension mechanism of the injection pump push rod and the injection pump in the present invention.

[0017] Figure 2 The structure of the extension component in the present invention is schematically shown Figure 1 .

[0018] Figure 3 The structure of the extension component in the present invention is schematically shown Figure 2 .

[0019] Figure 4 The structure of the second slider in the present invention is Figure 1 .

[0020] Figure 5 Schematic diagram of the travel of the potentiometer and the push rod arm in the present invention Figure 1 .

[0021] Figure 6 The structure of the extension component in the present invention is schematically shown Figure 3 .

[0022] Figure 7 The structure of the extension component in the present invention is schematically shown Figure 4 .

[0023] Figure 8 The structure of the second slider in the present invention is Figure 2 .

[0024] Fig. 9Schematic diagram of the travel of the potentiometer and the push rod arm of the present invention Figure 2 .

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 100, lower shell; 101, upper shell; 101a, battery; 102, front shell; 103, main control board; 200, extension assembly; 201, pump body; 202, stepping motor; 202a, driving gear disc; 203, driven gear disc; 204, lead screw; 205, potentiometer; 205a, first slider; 206, push rod arm; 207, second slider; 207a, push plate; 208, photoelectric sensor; 209, follow-up tension spring; 2010, guide shaft; 2011, follow-up compression spring; 2012, pull rod; 300, push-pull box; 301, pressure plate; 400, rotating pressure handle; 401, rotating shaft; 402, torsion spring. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Example 1

[0032] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5, which is the first embodiment of the present invention, provides an extension mechanism for the push rod of an injection pump. The extension mechanism extends the length of the push rod arm 206 by a follower tension spring 209 and has a wide range of applications.

[0033] Specifically, the lower housing 100 comprises an upper housing 101 mounted on its upper surface and a front housing 102 mounted between the upper housing 101 and the lower housing 100; and an extension assembly 200 arranged between the lower housing 100 and the upper housing 101 for extending the length of the injection pump, the extension assembly 200 comprises a pump body 201 mounted between the lower housing 100 and the upper housing 101 and a stepper motor 202 mounted on a side wall of the pump body 201, a driving gear disc 202a is mounted on the output shaft of the stepper motor 202, a driven gear disc 203 is arranged on one side of the driving gear disc 202a, and a rack on the outer wall of the driving gear disc 202a is meshed with a rack on the outer wall of the driven gear disc 203, and the center of one side end face of the driven gear disc 203 A screw rod 204 is installed in the position, and the other end of the screw rod 204 passes through the bearing on one end face of the pump body 201 and is connected to the thread groove on one end face of the push rod arm 206. The external thread on the outer wall of the screw rod 204 is spirally matched with the internal thread on the inner wall of the thread groove on the push rod arm 206. The edge of one end of the outer wall of the push rod arm 206 is connected to the second slider 207 by a fixing bolt. The inner wall of the second slider 207 is slidably connected to the outer wall of the pump body 201. A push plate 207a is fixed on the outer wall of the second slider 207. A potentiometer 205 is provided on one end face of the pump body 201. The outer side of the potentiometer 205 is slidably connected to the first slider 205a; the push plate 207a and the first slider 205a are hung and connected by a follower tension spring 209.

[0034] When the above arrangement is in use, the stepper motor 202 is started, and the stepper motor 202 runs, and its output shaft rotates to drive the active gear plate 202a to rotate, and the rack on the outer wall of the active gear plate 202a is meshed with the rack on the outer wall of the driven gear plate 203, so when the active gear plate 202a rotates, it will drive the driven gear plate 203 to rotate synchronously, and the rotation of the driven gear plate 203 will drive the screw rod 204 to rotate, wherein the external thread on the outer wall of the screw rod 204 is spirally matched with the internal thread on the inner wall of the thread groove on the push rod arm 206, so when the screw rod 204 rotates, it will push the push rod arm 206 extends and pushes out or retracts into the pump body 201, thereby driving the push-pull box 300 at the outer end of the push rod arm 206 to move, and synchronously driving the piston of the syringe to move to complete the injection operation. In actual use, due to the limited stroke of the existing specification potentiometer 205 or the high cost of customizing a longer stroke positioner, a conventional stroke potentiometer 205 is still required, resulting in the stroke S2 ​​required by the push rod arm 206 being greater than the stroke S1 of the potentiometer 205, and the stroke difference △S. In order to solve the stroke difference △S, the present design increases the stroke difference S2 on the second slider 207. Add a push plate 207a, a follower spring 209 and a photoelectric sensor 208, (wherein the push plate 207a is fixed on the second slider 207, and the follower spring 209 is designed as a tension spring, and its two ends are respectively connected to the push plate 207a and the first slider 205a), when the push rod arm 206 moves toward the pump body 201 (to the left) or moves away from the pump body 201 (to the right), but both are within the range of the potentiometer 205 stroke S1, the position of the push-pull box 300 connecting the push rod arm 206 changes from 0 (this is the leftmost limit position) to S1, within the range of 0 to S1 , the position signal is converted into a corresponding position value through the resistance signal of the potentiometer 205. When the push rod arm 206 moves to exceed S1, that is, within the range of S1 to S2 (this is the rightmost limit position), the push plate 207a and the first slider 205a begin to separate, and the stretching amount of the follower tension spring 209 reaches the maximum value △S from 0 until the push plate 207a blocks the photoelectric sensor 208 on the right side. At this time, the second slider 207 is connected to the push-pull box 300, and the push rod arm 206 moves to the right limit position, which is the maximum position of the push rod arm 206 and the push-pull box 300 extending out of the pump body 201.

[0035] Furthermore, the operation of the stepper motor 202 can drive the active gear disc 202a to rotate, and the outer wall of the active gear disc 202a and the outer wall of the driven gear disc 203 are engaged through the rack to play a transmission role. The driven gear disc 203 rotates synchronously under the action of the active gear disc 202a, and drives the lead screw 204 to rotate. The rotation of the lead screw 204 can drive the push rod arm 206 to extend or retract, and the movement of the push rod arm 206 can drive the second slider 207 to move synchronously.

[0036] Read in detail Figure 1 As shown, a battery 101a is installed on the inner wall of the upper housing 101, and a main control board 103 is installed on one side of the interior of the lower housing 100;

[0037] When the above-mentioned arrangement is in use, a display screen and buttons are provided on the front shell 102, and the machine is operated by operating the touch screen or buttons, and then the push-pull box 300 is driven by the internal mechanical device to move, and the cross handle of the syringe is pushed to move to achieve the effect of injecting liquid. Among them, the main control board 103 drives the stepper motor 202, the photoelectric sensor 208, the displacement sensor, etc. to perform data collection and signal processing for the convenience of operation and use by the staff.

[0038] Furthermore, the display screen and buttons are installed on the front shell 102 and can be used to operate the machine. The lower shell 100 is used to carry components or parts such as the extension component 200 and the main control board 103. The battery 101a is used to power the device when it is not connected to AC power. The upper shell 101 is used to install the battery 101a and the handle component, etc. The main control board 103 is used to collect data and process signals for the motor drive and pressure sensors, photoelectric sensors 208, displacement sensors, etc. This is a prior art, so it will not be elaborated here.

[0039] Example 2

[0040] Reference Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 , which is the second embodiment of the present invention, is based on the previous embodiment, except that, in order to increase the length of the push rod arm 206, the elasticity of the follower compression spring 2011 is adjusted, and the application range is wide.

[0041] Specifically, the front end of the upper surface of the second slider 207 is fixedly connected with a guide shaft 2010, and the outer wall of the guide shaft 2010 is sleeved with a follower compression spring 2011 and a pull rod 2012, and the follower compression spring 2011 is located on one side of the pull rod 2012;

[0042] When the above arrangement is in use, it can be known from the above that the stepper motor 202 is started, thereby driving the push-pull box 300 at the outer end of the push rod arm 206 to move, and synchronously driving the piston of the syringe to move to complete the injection operation. In actual use, when the movement stroke of the push rod arm 206 and the push-pull box 300 is in the range of 0 to S1, the second slider 207 is pushed to the left by the push plate 207a, and the second slider 207 is dragged to the right by the pull rod 2012. The necessary condition for dragging to the right is that the follower compression spring 2011 is compressed, and the thrust provided by it can ensure that the pull rod 2012 is tightly fitted with the left side of the second slider 207, ensuring that To ensure that there is no delay between the movement of the second slider 207 and the movement of the push rod arm 206, after moving to the right to S1, the pull rod 2012 cannot continue to move to the right because the stroke of the second slider 207 has reached the maximum. If it needs to continue to move to the right, the follow-up compression spring 2011 begins to be compressed. The push rod arm 206 and the push-pull box 300 can continue to move to the right by 0~△S. When the compression amount reaches △S, the push plate 207a blocks the photoelectric sensor 208. At this time, the control system senses that the push-pull box 300 has reached the maximum displacement on the right side, so it controls the stepper motor 202 to stop moving. At this time, the stroke of the push rod arm 206 on the pump body 201 reaches the maximum.

[0043] Furthermore, the push plates 207a are respectively installed on the first slider 205a, wherein the guide shaft 2010 passes through the follower compression spring 2011 and the pull rod 2012, the pull rod 2012 can slide left and right on the guide shaft 2010, and the pull rod 2012 and the push plate 207a are respectively located on the left and right sides of the second slider 207.

[0044] Example 3

[0045] Reference Figure 1 and Figure 2 , which is the third embodiment of the present invention, is based on the above-mentioned embodiment 1, and the difference is that, in order to facilitate the disassembly and assembly of the syringe, the pressure handle 400 is rotated around the rotating shaft 401 under the elastic performance of the torsion spring 402, and the syringe is installed on the outside of the lower shell 100, thereby facilitating the staff to quickly disassemble and assemble the syringe, and the work efficiency is high.

[0046] Specifically, the push-pull box 300 includes a pressure plate 301 rotatably connected to the upper and lower ends of one side of the push-pull box 300, and one side of the push-pull box 300 is fixedly connected to the outer end of the push rod arm 206; it also includes a rotating pressure handle 400 arranged on the outer side of the lower shell 100 and a rotating shaft 401 fixedly connected to the end face of one side of the rotating pressure handle 400, and a torsion spring 402 is sleeved on the outer wall of the rotating shaft 401, and the other end of the rotating shaft 401 is connected to the rotating shaft of the potentiometer 205 through a coupling;

[0047] When the above arrangement is in use, the syringe is first placed on the outside of the lower shell 100, and then the rotating pressure handle 400 is pushed to make the rotating pressure handle 400 rotate around the rotating shaft 401 as the center and squeeze the torsion spring 402. Then, the syringe is placed between the rotating pressure handle 400 and the outer wall of the lower shell 100, and then the force on the rotating pressure handle 400 is stopped. At this time, the rotating pressure handle 400 is rotated in the opposite direction under the action of the elastic performance of the torsion spring 402 and is pressed on the outside of the outer wall of the syringe. The syringe can be fixed in the mounting groove on the lower shell 100 to prevent the syringe from being displaced or loosened. At the same time, it is convenient for medical staff to quickly disassemble and assemble the syringe, and the work efficiency is high. The cross handle on the syringe is pressed by the pressure plate 301 on the push-pull box 300 to limit the cross handle of the syringe.

[0048] Furthermore, the pressing plate 301 can be rotated to clamp the end of the cross handle on the syringe to achieve the connection between the cross handle and the push-pull box 300. When the rotating pressing handle 400 is subjected to force, it will rotate around the rotating shaft 401 as the center and squeeze the torsion spring 402 to achieve the disassembly and assembly of the syringe.

[0049] In addition, it should be noted that the components not described in detail in this article are prior art.

[0050] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only several embodiments are described in detail in this disclosure, it should be easily understood by the personnel referring to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and ratio of various elements, and parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to specific embodiments, but extends to multiple modifications that still fall within the scope of the appended claims.

[0051] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0052] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An extension mechanism for a syringe pump push rod, characterized in that: include, Lower housing (100); It comprises an upper shell (101) mounted on its upper surface and a front shell (102) mounted between the upper shell (101) and the lower shell (100); and, An extension component (200) is arranged between the lower housing (100) and the upper housing (101) for extending the length of the injection pump, the extension component (200) comprising a pump body (201) installed between the lower housing (100) and the upper housing (101) and a stepping motor (202) installed on a side wall of the pump body (201), a driving gear disc (202a) is installed on the output shaft of the stepping motor (202), a driven gear disc (203) is arranged on one side of the driving gear disc (202a), and a rack on the outer wall of the driving gear disc (202a) is meshed with a rack on the outer wall of the driven gear disc (203), and a screw rod (204) is installed at the center position of one end surface of the driven gear disc (203), The other end of the screw rod (204) passes through the bearing on one end face of the pump body (201) and is connected to the thread groove on one end face of the push rod arm (206); the external thread on the outer wall of the screw rod (204) is spirally matched with the internal thread on the inner wall of the thread groove on the push rod arm (206); the edge of one end of the outer wall of the push rod arm (206) is connected to the second slider (207) by a fixing bolt; the inner wall of the second slider (207) is slidably connected to the outer wall of the pump body (201); a push plate (207a) is fixedly provided on the outer wall of the second slider (207); a potentiometer (205) is provided on one end face of the pump body (201); and the outer side of the potentiometer (205) is slidably connected to the first slider (205a).

2. The extension mechanism of the injection pump push rod according to claim 1, characterized in that: A battery (101a) is installed on the inner side wall of the upper housing (101), and a main control board (103) is installed on one side of the interior of the lower housing (100).

3. The extension mechanism of the injection pump push rod according to claim 1, characterized in that: The push plate (207a) and the first sliding block (205a) are connected by hanging via a follower tension spring (209).

4. The extension mechanism of the injection pump push rod according to claim 1, characterized in that: The front end of the upper surface of the second sliding block (207) is fixedly connected to a guide rail shaft (2010), and a follower compression spring (2011) and a pull rod (2012) are sleeved on the outer wall of the guide rail shaft (2010), and the follower compression spring (2011) is located on one side of the pull rod (2012).

5. Injection pump, characterized in that: An extension mechanism for a syringe pump push rod comprising any one of claims 1 to 4; and The push-pull box (300) comprises a pressing plate (301) rotatably connected above and below one end surface thereof, and one end surface of the push-pull box (300) is fixedly connected to the outer end of the push rod arm (206).

6. The injection pump according to claim 5, characterized in that: It also includes a rotating pressure handle (400) arranged on the outside of the lower shell (100) and a rotating shaft (401) fixedly connected to the end surface of one side of the rotating pressure handle (400), a torsion spring (402) is sleeved on the outer wall of the rotating shaft (401), and the other end of the rotating shaft (401) is connected to the rotating shaft of the potentiometer (205) through a coupling.

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