Endoscope liquid injection mechanism

Abstract

The utility model provides a liquid injection mechanism for an endoscope. The liquid injection mechanism solves the problems that a pulse phenomenon exists and spray forming is not ideal due to the fact that an existing injection mechanism adopts a peristaltic pump as a power source. The endoscope liquid injection mechanism comprises a base, a clamping assembly arranged on the base and used for clamping a liquid container and a push rod coaxially arranged with the liquid container, one end, close to the liquid container, of the push rod is provided with a push injection head, and the base is provided with a power assembly used for driving the push rod to move in the axial direction of the liquid container. The power assembly drives the push rod to do reciprocating rectilinear motion, when the push rod is pushed, liquid in the liquid container is linearly sprayed out, and the pulse phenomenon generated by a peristaltic pump and the phenomenon that the spraying effect is not ideal are effectively eliminated.

Description

Technical Field

[0001] This utility model belongs to the field of liquid injection technology and relates to an endoscope liquid injection mechanism. Background Technology

[0002] When staining a target area is required during endoscopic examinations, nurses often use a syringe connected to a spray tube to inject the stain, which is laborious and the mist spray effect is poor. To address this, a Chinese patent discloses an artificial intelligence-assisted examination device for gastrointestinal endoscopy [authorization announcement number CN216148001U], including a flushing module and a staining module. The staining module includes a staining pump, a staining tube, a staining solution container, and a spray tube. One end of the staining tube is connected to the staining solution container, and the other end is connected to one end of the spray tube. The other end of the spray tube passes through the gastrointestinal endoscope's flow channel from the biopsy port. The staining tube is equipped with a staining pump.

[0003] The aforementioned staining pump is a peristaltic pump. It uses a rotary pump to draw liquid from inside the container into the spray pipe using negative pressure, and then pumps it out. Due to the biological characteristics of the staining solution and the functional limitations of the peristaltic pump, the remaining liquid level inside the container cannot be monitored in real time. As a power source, the peristaltic pump, due to its structural characteristics, produces a spray with obvious pulsation, and the spray formation produced by the peristaltic pump is not ideal. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an ideal spray-forming endoscopic liquid injection mechanism.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] An endoscopic fluid injection mechanism includes a base, a clamping assembly mounted on the base for holding a liquid container, and a push rod coaxially arranged with the liquid container. The end of the push rod near the liquid container has an injection head, and the base is provided with a power assembly for driving the push rod to move axially along the liquid container.

[0007] The power unit drives the push rod to reciprocate linearly, which in turn drives the injection head to reciprocate linearly. When the push rod advances, the liquid in the liquid container is sprayed out linearly, effectively eliminating the pulsation phenomenon and unsatisfactory spray effect caused by the peristaltic pump.

[0008] In the aforementioned endoscopic fluid injection mechanism, the power assembly includes a screw motor mounted on a base, a nut threaded onto the screw of the screw motor, and a limiting structure for circumferentially limiting the nut. The push rod is connected to the nut.

[0009] The screw and push rod are parallel. When the screw motor is working, it drives the screw to rotate. The nut that is threaded with the screw moves linearly under the action of the limiting structure, thereby driving the push rod to move linearly. When the push rod moves forward, it can make the piston in the liquid container move forward.

[0010] In the aforementioned endoscopic fluid injection mechanism, the limiting structure includes a guide rail mounted on a base and a slide block slidably mounted on the guide rail. The guide rail is parallel to the push rod, and the nut is fixedly connected to the slide block. The guide rail and slide block provide circumferential limiting for the nut while also guiding it, ensuring motion accuracy.

[0011] In the above-mentioned endoscope liquid injection mechanism, the base is provided with a first mounting plate and a second mounting plate disposed opposite to the first mounting plate. The screw motor is fixed on the first mounting plate, and the screw of the screw motor extends to the second mounting plate after passing through the first mounting plate. The second mounting plate has a through hole for the push rod to pass through, and the clamping assembly is disposed on the second mounting plate.

[0012] The guide rail is located between the first mounting plate and the second mounting plate. The first and second mounting plates facilitate the installation of the screw motor and clamping components. The overall structure is reasonably arranged and easy to assemble, which can effectively improve the injection accuracy of the liquid container.

[0013] In the aforementioned endoscopic fluid injection mechanism, the clamping assembly includes a cover plate parallel to the second mounting plate. The cover plate has a clearance hole for the injection head to pass through. A guide shaft parallel to the cover plate is provided between the second mounting plate and the cover plate. The guide shaft is perpendicular to the guide rail. Two opposing sliders are slidably fitted on the guide shaft. The sliders have clamping portions extending from the clearance hole. The injection head is located between the two sliders and can cause the two sliders to move away from each other when the injection head retracts. A clamping structure is also provided between the second mounting plate and the cover plate to cause the two sliders to move inward when the injection head is pushed forward.

[0014] The second mounting plate and cover plate are respectively perpendicular to the base. The second mounting plate has a hole for the push rod to pass through, and the push rod is fixed to the injection head after passing through the hole. When the push rod drives the injection head forward, the injection head disengages from the obstruction of the two sliders. The two sliders then move inward under the action of the clamping structure, clamping the liquid container through two opposing clamping parts. When the push rod drives the injection head backward, the injection head separates the two sliders, and the two opposing clamping parts disengage from the liquid container.

[0015] In the above-mentioned endoscopic fluid injection mechanism, the slider is provided with a first inclined surface on the side near the injection head, and the injection head is provided with a second inclined surface corresponding to the first inclined surface. When the second inclined surface presses against the first inclined surface, the two sliders move away from each other.

[0016] In the above-mentioned endoscope fluid injection mechanism, the clamping structure includes a support block and a compression spring disposed between the second mounting plate and the cover plate. The support block is located on the side of the slider away from the injection head. The two ends of the compression spring act on the slider and the support block respectively. The elastic force of the compression spring acting on the slider extends along the length direction of the guide shaft.

[0017] In the aforementioned endoscopic fluid injection mechanism, the base is equipped with two sensors: a first sensor corresponding to the starting position of the nut and a second sensor corresponding to the ending position of the nut. The first sensor is used to detect whether the nut has reached the starting position, and the second sensor is used to detect whether the nut has reached the ending position.

[0018] Two sensors are connected to the control system, and the screw motor is also connected to the control system. Once the starting position of the nut is determined by the first sensor, the underlying program in the control system can calculate the position of the injection head by the number of pulses of the screw motor and the screw pitch, thereby calculating the remaining liquid in the liquid container.

[0019] Compared with existing technologies, this endoscopic fluid injection mechanism has the following advantages:

[0020] The push-in method sprays the liquid onto the target location, effectively eliminating the pulsation phenomenon and unsatisfactory spray effect caused by the peristaltic pump. This method also makes it easier to implement real-time monitoring of the remaining liquid in the liquid container, enabling monitoring of the remaining amount without affecting the biological properties of the internal solution. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the endoscope fluid injection mechanism.

[0022] Figure 2 This is another structural schematic diagram of the endoscope fluid injection mechanism.

[0023] Figure 3 This is a schematic diagram of the clamping assembly provided by this utility model.

[0024] Figure 4 This is a cross-sectional view of the clamping assembly provided by this utility model.

[0025] In the diagram, 1. Base; 2. Liquid container; 3. Push rod; 4. Injection head; 5. Screw motor; 6. Nut; 7. Guide rail; 8. Slide; 9. First mounting plate; 10. Second mounting plate; 11. Cover plate; 12. Guide shaft; 13. Slider; 14. Clamping part; 15. First inclined surface; 16. Second inclined surface; 17. Support block; 18. First sensor; 19. Second sensor; 20. Limiting plate; 21. Clamping surface. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 and Figure 2 The endoscopic liquid injection mechanism shown includes a base, a clamping assembly mounted on the base for holding a liquid container (such as a liquid container for holding staining solution), and a push rod coaxially arranged with the liquid container. The end of the push rod near the liquid container has a push head, which is cylindrical and coaxially arranged with the push rod. When the push head is pushed forward, it can extend into the liquid container and push the piston inside the liquid container. A power assembly is provided on the base for driving the push rod to move axially along the liquid container.

[0028] The power unit drives the push rod to reciprocate linearly, which in turn drives the injection head to reciprocate linearly. When the push rod advances, the liquid in the liquid container is sprayed out linearly, effectively eliminating the pulsation phenomenon and unsatisfactory spray effect caused by the peristaltic pump.

[0029] like Figure 1 and Figure 2 As shown, the power assembly includes a screw motor mounted on a base, a nut threaded onto the screw of the screw motor, and a limiting structure for circumferentially limiting the nut. A push rod is fixedly connected to the nut. The screw and push rod are parallel.

[0030] When the screw motor is working, it drives the screw to rotate, and the nut that is threaded with it moves linearly under the action of the limiting structure, thereby driving the push rod to move linearly.

[0031] like Figure 1 and Figure 2 As shown, the limiting structure includes a guide rail mounted on the base and a slide block slidably mounted on the guide rail. The guide rail is parallel to the push rod, and the nut is fixedly connected to the slide block. By fixing the nut to the slide block, which can only move linearly, the circumferential rotation of the nut can be effectively restricted. When the screw rotates, the nut can only move linearly, thereby driving the push rod to move axially.

[0032] To facilitate the installation of the above structures, such as Figure 1 and Figure 2 As shown, a first mounting plate and a second mounting plate parallel to the first mounting plate are provided on the base. The first and second mounting plates are perpendicular to the surfaces of the base used for mounting the guide rails. The guide rails are located between the first and second mounting plates. A screw motor is fixed to the first mounting plate, and the screw of the screw motor passes through the first mounting plate and extends to the second mounting plate, as shown. Figure 3 As shown, the second mounting plate has a through hole for the push rod to pass through. After the push rod passes through the through hole, it is fixed to the injection head. The clamping assembly is located on the second mounting plate.

[0033] like Figure 3and Figure 4 As shown, the clamping assembly includes a cover plate parallel to the second mounting plate. The cover plate is located on the side of the second mounting plate away from the first mounting plate. The cover plate has a clearance hole for the injection head to pass through. A guide shaft parallel to the cover plate is provided between the second mounting plate and the cover plate. The guide shaft is perpendicular to the guide rail. Two opposing sliders are slidably fitted on the guide shaft. The sliders have clamping parts extending from the clearance hole. The side of the clamping part used to clamp the liquid container has a clamping surface that mates with the outer surface of the liquid container.

[0034] The injection head is located between the two sliders and moves the sliders outwards when the injection head retracts. To achieve this function, such as... Figure 4 As shown, the slider has a first inclined surface on the side near the injection head, and the injection head has a second inclined surface corresponding to the first inclined surface. When the second inclined surface presses against the first inclined surface, the two sliders move away from each other.

[0035] In order for the two opposing clamping parts to clamp the liquid container, a clamping structure is provided between the second mounting plate and the cover plate to make the two sliders move inward when the injection head is pushed forward.

[0036] When the push rod drives the injection head forward, the injection head disengages from the blocking limit of the two sliders. The two sliders then move inward under the action of the clamping structure, clamping the liquid container through the two opposing clamping parts. When the push rod drives the injection head backward, the injection head separates the two sliders, and the two opposing clamping parts disengage from the liquid container.

[0037] In this embodiment, as Figure 3 and Figure 4 As shown, the clamping structure includes a support block and a compression spring (not shown in the figure) located between the second mounting plate and the cover plate. The support block is located on the side of the slider away from the injection head. The two ends of the compression spring act on the slider and the support block respectively. The elastic force of the compression spring acting on the slider extends along the length direction of the guide shaft.

[0038] To prevent the compression spring from falling off, a recessed hole coaxial with the guide shaft is provided on the side of the slider near the support block. The compression spring is sleeved on the guide shaft with one end extending into the recessed hole. The total length of the compression spring is greater than the depth of the recessed hole. When the clamping structure is in the loose state, the compression spring can be completely retracted into the recessed hole under the squeezing action of the slider.

[0039] As the injection head moves forward, it will inevitably break free from the position that limits the inward movement of the two sliders. Therefore, as follows: Figure 3 As shown, a limiting plate is provided in the clearance hole to limit the maximum position of the inward movement of the clamping part. The limiting plate is fixed to the cover plate, and the middle part of the limiting plate has a guide hole for the injection head to pass through.

[0040] The limiting plate is circular and limits the maximum inward movement of the two clamping parts. When the two clamping parts abut against the limiting plate, the maximum distance between the two first inclined surfaces is greater than the minimum distance between the two second inclined surfaces, which can ensure that when the injection head retracts, the two sliders can be separated outward through the second inclined surfaces.

[0041] In this embodiment, there are two guide shafts that are parallel to each other. The two guide shafts guide the slider together, that is, the slider is coaxially slidably sleeved on the two guide shafts. The stability of the slider can be improved by the two guide shafts. The injection head is located between the two guide shafts.

[0042] In this embodiment, the endoscopic liquid injection mechanism can simultaneously clamp and inject three liquid containers. There are three sets of corresponding push rods, injection heads and clamping components. The three sets of clamping components are all located between the same second mounting plate and cover plate. There are also three sets of power components, which drive the corresponding push rods to reciprocate linearly.

[0043] like Figure 1 As shown, the base has sensors, and each nut is equipped with two sensors: a first sensor corresponding to the starting position of the nut and a second sensor corresponding to the ending position of the nut. The first sensor is used to detect whether the nut has reached the starting position, and the second sensor is used to detect whether the nut has reached the ending position.

[0044] The sensor is connected to the control system, and the screw motor is also connected to the control system. Once the starting position of the nut is determined by the first sensor, the underlying program in the control system can calculate the position of the injection head by the number of pulses of the screw motor and the screw pitch, thereby calculating the remaining liquid in the liquid container.

[0045] In this embodiment, the first sensor and the second sensor are position sensors, and the specific algorithm used by the underlying program is an existing method.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An endoscopic fluid injection mechanism, characterized in that, It includes a base (1), a clamping assembly for clamping a liquid container (2) disposed on the base (1), and a push rod (3) coaxially disposed with the liquid container (2). The push rod (3) has a push head (4) at one end near the liquid container (2). The base (1) is provided with a power assembly for driving the push rod (3) to move along the axial direction of the liquid container (2).

2. The endoscopic fluid injection mechanism according to claim 1, characterized in that, The power assembly includes a screw motor (5) mounted on a base (1), a nut (6) threaded onto the screw of the screw motor (5), and a limiting structure for circumferentially limiting the nut (6). The push rod (3) is connected to the nut (6).

3. The endoscopic fluid injection mechanism according to claim 2, characterized in that, The limiting structure includes a guide rail (7) on the base (1) and a slide block (8) slidably disposed on the guide rail (7). The guide rail (7) is parallel to the push rod (3), and the nut (6) is fixedly connected to the slide block (8).

4. The endoscopic fluid injection mechanism according to claim 2, characterized in that, The base (1) is provided with a first mounting plate (9) and a second mounting plate (10) opposite to the first mounting plate (9). The screw motor (5) is fixed on the first mounting plate (9). The screw of the screw motor (5) passes through the first mounting plate (9) and extends to the second mounting plate (10). The second mounting plate (10) has a through hole for the push rod (3) to pass through. The clamping assembly is provided on the second mounting plate (10).

5. The endoscopic fluid injection mechanism according to claim 4, characterized in that, The clamping assembly includes a cover plate (11) parallel to the second mounting plate (10), the cover plate (11) having a clearance hole for the injection head (4) to pass through, a guide shaft (12) parallel to the cover plate (11) between the second mounting plate (10) and the cover plate (11), the guide shaft (12) being perpendicular to the guide rail (7), two opposing sliders (13) being slidably fitted on the guide shaft (12), the sliders (13) having a clamping part (14) extending from the clearance hole, the injection head (4) being located between the two sliders (13) and being able to move the two sliders (13) away from each other when the injection head (4) retracts, and a clamping structure for moving the two sliders (13) inward when the injection head (4) is pushed forward between the second mounting plate (10) and the cover plate (11).

6. The endoscopic fluid injection mechanism according to claim 5, characterized in that, The slider (13) has a first inclined surface (15) on the side near the injection head (4), and the injection head (4) has a second inclined surface (16) corresponding to the first inclined surface (15). When the second inclined surface (16) presses the first inclined surface (15), the two sliders (13) move away from each other.

7. The endoscopic fluid injection mechanism according to claim 5, characterized in that, The clamping structure includes a support block (17) and a compression spring disposed between the second mounting plate (10) and the cover plate (11). The support block (17) is located on the side of the slider (13) away from the injection head (4). The two ends of the compression spring act on the slider (13) and the support block (17) respectively. The elastic force of the compression spring acting on the slider (13) extends along the length direction of the guide shaft (12).

8. The endoscopic fluid injection mechanism according to claim 2, characterized in that, The base (1) is provided with two sensors: a first sensor (18) corresponding to the starting position of the nut (6) and a second sensor (19) corresponding to the ending position of the nut (6). The first sensor (18) is used to detect whether the nut (6) has reached the starting position, and the second sensor (19) is used to detect whether the nut (6) has reached the ending position.

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