Safe foot-controlled injection pump special for nerve block under ultrasonic guidance

Abstract

A safe ultrasonic-guided foot-controlled injection pump special for nerve block comprises a needle cylinder shell used for containing liquid medicine, a cavity, a piston rod, a driving assembly used for pushing the piston rod to reciprocate, a foot switch used for driving the driving assembly and a safe limiting assembly arranged on the needle cylinder shell. The pedal switch inputs a control signal to the driving assembly, so that the driving assembly pushes the piston rod to move in the cavity, the safety limiting assembly is arranged in the length extending direction of the outer side face of the needle cylinder shell, and when the piston rod moves towards the rear portion of the cavity from the interior of the needle cylinder shell, the safety limiting assembly is driven to move. The safety limiting assembly is used for limiting the piston rod to move towards the rear portion of the needle cylinder shell from the interior of the cavity, and the pedal switch is arranged to control the driving assembly so that a user can step on the pedal switch with the foot to control the piston rod to push liquid medicine to be injected and retreated. Therefore, the two hands of the user are liberated, so that the two hands of the user can perform other operations and use other tools.

Description

Technical Field

[0001] The utility model relates to an injection pump, in particular to a safe foot-controlled injection pump specially used for nerve block under ultrasound guidance. Background Art

[0002] The injection mode and suction mode of the syringe pump can be achieved by switching the driving motor forward and reverse.

[0003] A Chinese invention patent (application number: 200910092819.4, publication number: CN102008770B) discloses a clamping device for an injection pump, comprising: an end portion; a clamping assembly passing through the end portion to clamp the injection pump, comprising: a clutch pressure handle arranged on the second end face of the end portion; a large gear connected to the clutch pressure handle and capable of rotating with the clutch pressure handle; a pin shaft passing between the first end face and the second end face of the end portion; a small gear arranged on the pin shaft, through which the large gear and the small gear can achieve reverse linkage; a clutch clamp connected to the pin shaft, which can be clamped or released with the rotation of the small gear. However, the following shortcomings still exist in the actual use process: during use, the hands of a single medical staff member have to perform other operations or hold other medical devices, and it is difficult to have free time to use both hands to additionally operate the injection pump, causing inconvenience during use. Utility Model Content

[0004] The utility model provides a safe foot-controlled injection pump for nerve block under ultrasound guidance, the main purpose of which is to overcome the defect that the existing injection pump needs manual operation to control the injection.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A foot-controlled injection pump for safe ultrasound-guided nerve block comprises a frame, a syringe shell arranged on the frame for accommodating a medicinal solution, a cavity arranged in the syringe shell and extending along the length direction of the syringe shell, a piston rod arranged in the cavity for reciprocating motion, a driving assembly for pushing the piston rod to reciprocate, a foot switch for driving the driving assembly, and a safety limit assembly arranged on the syringe shell, wherein the foot switch inputs a control signal to the driving assembly so that the driving assembly pushes the piston rod to move in the cavity, the safety limit assembly is arranged along the length extension direction on the outer surface of the syringe shell, and when the piston rod moves in the cavity toward the front direction of the cavity, the safety limit assembly is driven to move toward the front of the syringe shell, and when the piston rod moves from the syringe shell toward the rear direction of the cavity, the safety limit assembly is used to limit the piston rod from the cavity to move toward the rear direction of the syringe shell.

[0007] Furthermore, the drive assembly includes a rotating motor for providing power, a screw rod provided on the kinetic energy output end of the rotating motor, and a slide nut provided on the screw rod and moving along the length extension direction of the screw rod, and the movement of the slide nut is used to push the piston rod to move, and the control signal includes a forward rotation signal for controlling the forward rotation of the rotating motor and a reverse rotation signal for controlling the reverse rotation of the rotating motor, and the foot switch includes a first pedal for outputting the forward rotation signal and a second pedal for outputting the reverse rotation signal, and the forward rotation signal is output to the rotating motor by stepping on the first pedal so that the rotating motor rotates forward, and the reverse rotation signal is output to the rotating motor by stepping on the second pedal so that the rotating motor reverses.

[0008] Furthermore, the foot switch also includes a partition plate provided between the first pedal and the second pedal, and the partition plate is used to separate the first pedal and the second pedal.

[0009] Furthermore, it also includes a rubber sleeve arranged on the front end of the piston rod and a pressure sensor arranged between the piston rod and the rubber sleeve, and the pressure sensor is used to detect the pressure generated by the drug solution on the pressure sensor.

[0010] Furthermore, it also includes a controller for controlling the drive component and an alarm for emitting a warning sound, the output end of the controller is electrically connected to the enable end of the drive component, the enable end of the controller is electrically connected to the output end of the foot switch, the enable end of the controller is electrically connected to the output end of the pressure sensor, and the output end of the controller is electrically connected to the enable end of the alarm.

[0011] Furthermore, it also includes a convex ring portion provided on the rear portion of the syringe shell, an assembly port provided on the convex ring portion, and a push block provided on the bottom of the piston rod and connected to the sliding nut, the safety limit assembly includes a long strip of fastener provided on the push block, a slot portion provided on the outer circumference of one side of the syringe shell and adapted to the fastener, and a plurality of teeth arranged on the slot portion, the fastener and the piston rod are arranged at intervals, the slot portion extends along the length direction of the syringe shell, the fastener extends to the slot portion through the assembly port, pushes the piston rod forward so that the front end of the fastener can be detachably embedded in the slot portion, and the teeth are used to prevent the fastener from retreating.

[0012] Furthermore, the latch tooth includes an inclined surface extending obliquely from the bottom of the slot portion to the opening of the upper portion of the slot portion, and a blocking surface provided on the top of the inclined surface and extending vertically downward to the bottom of the slot portion. The top of the inclined surface is connected to the top of the blocking surface, and the latch slides over the inclined surface when moving forward and abuts against the blocking surface when moving backward.

[0013] Furthermore, the assembly port includes a first opening for the fastener to pass through, and a second opening provided on the upper portion of the first opening for raising the position of the fastener, and the first opening and the second opening are connected as one.

[0014] Furthermore, the rotating motor is a steering gear.

[0015] Furthermore, the cross section of the latch tooth is a right-angled triangle.

[0016] Compared with the prior art, the beneficial effects produced by the utility model are:

[0017] The utility model has a simple structure and strong practicality. By setting a foot switch to control the driving component, the user can control the piston rod to push the injection and retraction of the medicine solution by stepping on the foot switch, thereby freeing the user's hands so that the user's hands can perform other operations and use other tools. By setting a safety limit component to limit the movement of the piston rod from the cavity toward the rear direction of the syringe shell, on the one hand, it effectively prevents the piston rod from retreating due to the user accidentally stepping on the foot switch during the injection operation, and on the other hand, it effectively maintains the stability of the piston rod advancement during the injection process, achieving the effect of killing two birds with one stone.

[0018] In the utility model, a rotating motor is provided to drive the screw rod to rotate so that the slide bar pushes the piston rod. The screw rod is used to drive the slide bar to move, and its displacement accuracy is better, which is suitable for the injection volume accuracy requirement of the injection pump.

[0019] In the utility model, by providing a partition plate, the distance between the first pedal and the second pedal is increased, which reduces the possibility of users accidentally stepping on the first pedal or the second pedal during use, thereby improving the stability of the injection pump.

[0020] In the utility model, by setting a pressure sensor to detect the pressure change applied by the drug solution to the rubber sleeve, it is helpful to judge whether the piston rod is in a forward state to push the drug solution injection state or the piston rod is in a backward state to suck.

[0021] In the present invention, an alarm is provided. When the pressure sensor detects the change in pressure exerted by the drug liquid on the rubber sleeve, the alarm issues a prompt, which helps the user to promptly discover whether the foot switch has been accidentally stepped on, causing the drive component to incorrectly move forward or backward, thereby improving the safety of using the foot switch to control the drive component to push the injection of drug liquid. On the other hand, the alarm is provided to issue a prompt, which helps the user to clearly know whether the drive component is in a state of pushing the drug liquid forward or in a state of withdrawing it backward, thereby improving the accuracy of the operation and achieving the effect of killing two birds with one stone.

[0022] In the utility model, by arranging an assembly port on the convex ring portion, on the one hand, the convex ring portion is the structure of the existing syringe housing, and the assembly port is directly arranged on the convex ring portion, which is convenient for processing and does not change the overall shape of the existing syringe housing. On the other hand, by passing the fastener through the assembly port, the fastener is installed on the slot portion and moved, so that the fastener is more firmly installed on one side of the syringe housing. The assembly port plays a role of limiting and supporting the fastener, achieving the effect of killing two birds with one stone.

[0023] In the utility model, by arranging the latch and the piston rod at the interval of the push block, the piston rod can simultaneously drive the latch to move forward synchronously when it moves into the cavity. On the one hand, the latch can be adaptively engaged with the latch teeth at the corresponding position, thereby accurately and timely limiting the retreat of the piston rod. On the other hand, the user can more intuitively check the position of the latch, which can help the user quickly determine the liquid level of the medicine in the cavity, thereby playing the role of indicating the liquid level and achieving the effect of serving two purposes.

[0024] In the utility model, an inclined surface is provided so that the latch slides over the inclined surface when it moves forward, and a blocking surface is provided so that the latch abuts against the blocking surface when it moves backward. When the user accidentally steps on the second pedal, the blocking surface blocks the retreat of the latch, thereby achieving the effect of delaying the retreat of the piston rod, thereby improving the safety of using the foot switch to control the injection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Figure 2 It is a structural diagram of the safety limit assembly.

[0027] Figure 3 It is a schematic diagram of the structure of the syringe shell.

[0028] Figure 4 It is a module schematic diagram of the utility model. DETAILED DESCRIPTION

[0029] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0030] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 A foot-controlled injection pump for safe ultrasound-guided nerve block comprises a frame 11, a syringe housing 12 disposed on the frame 11 for containing a liquid medicine 13, a cavity 31 disposed in the syringe housing 12 and extending along the length direction of the syringe housing 12, a piston rod 16 disposed in the cavity 31 and reciprocating, a driving component 42 for driving the piston rod 16 to reciprocate, a foot switch 27 for driving the driving component 42, a safety limiter component 43 disposed on the syringe housing 12, and a foot switch 27 disposed on the syringe housing 12. The invention relates to a convex ring portion 36 on the rear part of the piston rod 12, an assembly opening 34 provided on the convex ring portion 36, a push block 17 provided on the bottom of the piston rod 16 and connected to the sliding nut 18, a set of rubber sleeves 14 provided on the front end of the piston rod 16, and a pressure sensor 25 provided between the piston rod 16 and the rubber sleeve 14, a controller 23 provided on the frame 11 for controlling the driving assembly 42, an alarm 41 provided on the frame 11 for emitting a warning sound, and a display screen 22 provided on the frame 11 for displaying information.

[0031] Reference Figure 1 , Figure 2 and Figure 4 The foot switch 27 inputs a control signal to the driving component 42, so that the driving component 42 pushes the piston rod 16 to move in the cavity 31. The safety limit component 43 is arranged along the length extension direction of the outer surface of the syringe housing 12. When the piston rod 16 moves in the cavity 31 toward the front direction of the cavity 31, it drives the safety limit component 43 to move toward the front of the syringe housing 12. When the piston rod 16 moves from the syringe housing 12 toward the rear direction of the cavity 31, the safety limit component 43 is used to limit the movement of the piston rod 16 from the cavity 31 toward the rear direction of the syringe housing 12.

[0032] Reference Figure 1 , Figure 2 and Figure 4By setting a foot switch 27 to control the drive component 42, the user can control the piston rod 16 to push the injection and retraction of the liquid medicine 13 by stepping on the foot switch 27, thereby freeing the user's hands so that the user's hands can perform other operations and use other tools. By setting a safety limit component 43 to limit the movement of the piston rod 16 from the cavity 31 toward the rear of the syringe housing 12, on the one hand, it effectively prevents the piston rod 16 from retreating due to the user accidentally stepping on the foot switch 27 during the injection operation, and on the other hand, it effectively maintains the stability of the piston rod 16 during the injection process, achieving the effect of killing two birds with one stone.

[0033] Reference Figure 1 and Figure 4 The driving assembly 42 includes a rotating motor 19 for providing power, a screw rod 20 arranged on the kinetic energy output end of the rotating motor 19, and a sliding nut 18 arranged on the screw rod 20 and moving along the length extension direction of the screw rod 20.

[0034] Reference Figure 1 and Figure 4 The movement of the slide nut 18 is used to push the piston rod 16 to move, and the control signal includes a forward rotation signal for controlling the forward rotation of the rotating motor 19 and a reverse rotation signal for controlling the reverse rotation of the rotating motor 19.

[0035] Reference Figure 1 and Figure 4 The foot switch 27 includes a first pedal 26 for outputting the forward signal, a second pedal 24 for outputting the reverse signal, and a partition plate 25 provided between the first pedal 26 and the second pedal 24.

[0036] Reference Figure 1 and Figure 4 By stepping on the first pedal 26, a forward rotation signal is output to the rotating motor 19 so that the rotating motor 19 rotates forward, and by stepping on the second pedal 24, a reverse rotation signal is output to the rotating motor 19 so that the rotating motor 19 rotates reversely.

[0037] Reference Figure 1 and Figure 4 By setting a rotating motor 19 to drive the screw rod 20 to rotate, the slide nut 18 pushes the piston rod 16. The screw rod 20 is used to drive the slide nut 18 to move, and its displacement accuracy is better, which is suitable for the injection volume accuracy requirements of the injection pump.

[0038] Reference Figure 1 The partition plate 25 is used to separate the first pedal 26 and the second pedal 24 .

[0039] Reference Figure 1By setting the partition plate 25, the distance between the first pedal 26 and the second pedal 24 is increased, which reduces the possibility of users accidentally stepping on the first pedal 26 or the second pedal 24 during use, thereby improving the stability of the injection pump.

[0040] Reference Figure 2 and Figure 3 The safety limit assembly 43 includes a long strip of fastener 15 provided on the push block 17, a slot portion 21 provided on the outer circumference of one side of the syringe housing 12 and adapted to the fastener 15, and a plurality of teeth 43 arranged on the slot portion 21.

[0041] Reference Figure 2 and Figure 3 The latch 15 is spaced apart from the piston rod 16, the slot portion 21 is extended along the length direction of the syringe housing 12, the latch 15 passes through the assembly port 34 and extends to the slot portion 21, pushing the piston rod 16 forward so that the front end of the latch 15 is detachably embedded in the slot portion 21, and the latch tooth 43 is used to prevent the latch 15 from retreating.

[0042] Reference Figure 2 and Figure 3 By setting an assembly port 34 on the convex ring portion 36, on the one hand, the convex ring portion 36 is a structure of the existing syringe housing, and the assembly port 34 is directly set on the convex ring portion 36, which is convenient for processing and does not change the overall appearance of the existing syringe housing 12. On the other hand, by passing the snap member 15 through the assembly port 34, the snap member 15 is installed on the groove portion 21 and moves, so that the snap member 15 is more firmly installed on one side of the syringe housing 12. The assembly port 34 limits and supports the snap member 15, achieving the effect of killing two birds with one stone.

[0043] Reference Figure 2 and Figure 3 By arranging the latch 15 and the piston rod 16 at intervals on the push block 17, when the piston rod 16 moves into the cavity 31, the latch 15 is driven to move forward synchronously. On the one hand, the latch 15 can be adaptively engaged with the latch teeth 43 at the corresponding position, thereby accurately and timely limiting the retreat of the piston rod 16. On the other hand, the user can more intuitively check the position of the latch 15, which can help the user quickly determine the liquid level of the medicine 13 in the cavity 31, thereby playing the role of indicating the liquid level and achieving the effect of serving two purposes.

[0044] Reference Figure 2 and Figure 3The latch tooth 43 includes an inclined surface 33 extending obliquely from the bottom of the slot portion 21 to the opening of the upper portion of the slot portion 21, and a blocking surface 32 provided on the top of the inclined surface 33 and extending vertically downward to the bottom of the slot portion 21. The top of the inclined surface 33 is connected to the top of the blocking surface 32. When the latch 15 moves forward, it slides over the inclined surface 33, and when the latch 15 moves backward, it abuts against the blocking surface 32. Specifically, the cross-section of the latch tooth 43 is a right triangle.

[0045] Reference Figure 2 and Figure 3 By setting the inclined surface 33, the latch 15 slides over the inclined surface 33 when it moves forward, and setting the blocking surface 32 so that the latch 15 abuts against the blocking surface 32 when it moves backward. When the user accidentally steps on the second pedal 24, the blocking surface 32 blocks the retreat of the latch 15, thereby achieving the effect of delaying the retreat of the piston rod 16, thereby improving the safety of using the foot switch 27 to control the injection work.

[0046] Reference Figure 2 and Figure 4 The pressure sensor 25 is used to detect the pressure generated by the drug solution 13 on the pressure sensor 25 .

[0047] Reference Figure 2 and Figure 4 By setting up a pressure sensor 25 to detect the pressure change applied by the liquid medicine 13 to the rubber sleeve 14, it is helpful to determine whether the piston rod 16 is in a forward state to push the liquid medicine 13 to inject or the piston rod 16 is in a backward suction state.

[0048] Reference Figure 1 , Figure 2 and Figure 4 The output end of the controller 23 is electrically connected to the enable end of the driving component 42, the enable end of the controller 23 is electrically connected to the output end of the foot switch 27, the enable end of the controller 23 is electrically connected to the output end of the pressure sensor 25, the output end of the controller 23 is electrically connected to the enable end of the alarm 41, and the output end of the controller 23 is electrically connected to the enable end of the display screen 22. The controller 23 can be an Arduino UNO R main control board or a single-chip microcomputer, and the rotating motor 19 is a steering gear, and the steering gear model is MG996. The use of a steering gear is cheaper than using a servo motor or a progressive motor, which effectively reduces the cost of equipment.

[0049] Reference Figure 1 , Figure 2 and Figure 4By setting the alarm 41, when the pressure sensor 25 detects the change in pressure applied by the drug liquid 13 to the rubber sleeve 14, the alarm 41 issues a prompt, which helps the user to promptly discover whether the foot switch 27 is accidentally stepped on, causing the drive component 42 to move forward or backward incorrectly, thereby improving the safety of using the foot switch 27 to control the drive component 42 to push the injection drug liquid 13. On the other hand, setting the alarm 41 to issue a prompt helps the user to clearly know whether the drive component 42 is in a state of pushing the drug liquid 13 or in a state of withdrawing it backward, thereby improving the accuracy of the operation and achieving the effect of killing two birds with one stone.

[0050] Reference Figure 3 The assembly port 34 includes a first opening 42 for the latch 15 to pass through and a second opening 43 provided on the upper portion of the first opening 42 for raising the position of the latch 15 , and the first opening 42 and the second opening 43 are connected as one.

[0051] Reference Figure 3 When there is no need to engage the latch 15 on the latch tooth 43 to restrict the piston rod 16 from retreating, the user can move the latch upward from the first opening 42 to engage the latch on the second opening 43 , so that the latch 15 is separated from the latch tooth 43 .

[0052] The above is only a specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. A safe foot-controlled injection pump for nerve block under ultrasound guidance, characterized by: The invention comprises a frame, a syringe shell provided on the frame for accommodating a medicinal solution, a cavity provided in the syringe shell and extending along the length direction of the syringe shell, a piston rod provided in the cavity for reciprocating motion, a driving assembly for pushing the piston rod to reciprocate, a foot switch for driving the driving assembly and a safety limit assembly provided on the syringe shell, wherein the foot switch inputs a control signal to the driving assembly so that the driving assembly pushes the piston rod to move in the cavity, the safety limit assembly is arranged along the length extension direction on the outer surface of the syringe shell, when the piston rod moves in the cavity toward the front direction of the cavity, the safety limit assembly is driven to move toward the front part of the syringe shell, and when the piston rod moves from the syringe shell toward the rear direction of the cavity, the safety limit assembly is used to limit the piston rod from the cavity toward the rear direction of the syringe shell from moving.

2. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 1, characterized in that: The driving assembly includes a rotating motor for providing power, a screw rod provided on the kinetic energy output end of the rotating motor, and a slide nut provided on the screw rod and moving along the length extension direction of the screw rod, and the movement of the slide nut is used to push the piston rod to move. The control signal includes a forward rotation signal for controlling the forward rotation of the rotating motor and a reverse rotation signal for controlling the reverse rotation of the rotating motor. The foot switch includes a first pedal for outputting the forward rotation signal and a second pedal for outputting the reverse rotation signal. By stepping on the first pedal, a forward rotation signal is output to the rotating motor to make the rotating motor rotate forward, and by stepping on the second pedal, a reverse rotation signal is output to the rotating motor to make the rotating motor reverse.

3. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 2, characterized in that: The foot switch further includes a partition plate disposed between the first pedal and the second pedal, wherein the partition plate is used to separate the first pedal and the second pedal.

4. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 1, characterized in that: It also includes a rubber sleeve arranged on the front end of the piston rod and a pressure sensor arranged between the piston rod and the rubber sleeve. The pressure sensor is used to detect the pressure generated by the drug liquid on the pressure sensor.

5. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 4, characterized in that: It also includes a controller for controlling the drive component and an alarm for emitting a warning sound, the output end of the controller is electrically connected to the enable end of the drive component, the enable end of the controller is electrically connected to the output end of the foot switch, the enable end of the controller is electrically connected to the output end of the pressure sensor, and the output end of the controller is electrically connected to the enable end of the alarm.

6. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 2, characterized in that: The cam is provided on the rear part of the syringe shell, an assembly port provided on the cam, and a push block provided on the bottom of the piston rod and connected to the sliding nut. The safety limit assembly includes a long strip of fastener provided on the push block, a slot portion provided on the outer peripheral edge of one side of the syringe shell and adapted to the fastener, and a plurality of teeth arranged on the slot portion. The fastener is spaced apart from the piston rod, and the slot portion extends along the length direction of the syringe shell. The fastener extends to the slot portion through the assembly port, and pushes the piston rod forward so that the front end of the fastener can be detachably embedded in the slot portion, and the teeth are used to prevent the fastener from retreating.

7. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 6, characterized in that: The latch tooth includes an inclined surface extending obliquely from the bottom of the slot portion to the opening of the upper portion of the slot portion, and a blocking surface provided on the top of the inclined surface and extending vertically downward to the bottom of the slot portion. The top of the inclined surface is connected to the top of the blocking surface as a whole. When the latch moves forward, it slides over the inclined surface, and when the latch moves backward, it abuts against the blocking surface.

8. A foot-controlled injection pump for safe ultrasound-guided nerve block according to claim 6, characterized in that: The assembly opening includes a first opening for the buckle to pass through, and a second opening provided on the upper part of the first opening for raising the position of the buckle, and the first opening and the second opening are connected as one body.

9. A safe foot-controlled injection pump for nerve block under ultrasound guidance as claimed in claim 2, characterized in that: The rotating motor is a steering gear.

10. A safe foot-controlled injection pump for nerve block under ultrasound guidance as claimed in claim 6, characterized in that: The cross section of the latch tooth is a right-angled triangle.

Images