An aspiration tube with filtering and flushing means

Abstract

The application discloses an aspirating tube with filtering and flushing devices and relates to the medical device field.The aspirating tube comprises a transfusion tube, a connecting tube is arranged on the right side of the transfusion tube, a flow control tube is arranged on the right side of the connecting tube, a plurality of drainage holes are arranged on the left side of the transfusion tube, a sewage suction tube is arranged on the inner wall of the transfusion tube, a flow guide tube is arranged on the inner wall of the sewage suction tube, one end of the flow guide tube penetrates the surface of the transfusion tube and is provided with a filter box, an antiskid pad is arranged on the surface of the transfusion tube, and a flow control filtering mechanism is arranged on the surface of the flow control tube.The sewage can be conveniently guided into the filter box for filtering treatment, and the subsequent pipeline blockage is prevented through the arrangement of the sewage suction tube and the flow guide tube.The flow rate of the washing liquid or physiological saline required for washing into the human body is controlled through the arrangement of the flow control filtering mechanism, the filtered dirt is conveniently removed, and the subsequent blockage is prevented.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a suction tube with a filtration and rinsing device. Background Technology

[0002] Suction tubes are auxiliary instruments used in clinical oral surgery. There are many types of suction tubes, mainly used in orthopedics, neurosurgery, obstetrics and gynecology, urology, and thoracic surgery. Thoracic and abdominal suction tubes are mainly used in thoracic and general surgery for suction during clinical operations.

[0003] When treating internal waste in the human body, suction tubes are usually used for adsorption. However, after the existing adsorption tubes have finished adsorbing the waste, impurities in the waste can clog the tubes, causing problems. At the same time, when injecting the necessary washing fluid or saline solution into the human body, the flow rate of the adsorption tubes cannot be controlled, which has certain limitations. Summary of the Invention

[0004] The purpose of this application is to provide a suction tube with a filtration and rinsing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a suction tube with a filtration and rinsing device, comprising an infusion tube, a connecting tube on the right side of the infusion tube, a flow control tube on the right side of the connecting tube, multiple drain holes on the left side of the infusion tube, a suction tube on the inner wall of the infusion tube, a guide tube on the inner wall of the suction tube, one end of the guide tube penetrating the surface of the infusion tube and having a filter box thereon, an anti-slip pad on the surface of the infusion tube, and a flow control filtration mechanism on the surface of the flow control tube.

[0006] With the above structure, the infusion tube and drain hole facilitate the introduction of liquid into the human body. The suction tube and guide tube facilitate the introduction of sewage into the filter box for filtration treatment to prevent subsequent pipe blockage. The flow control filtration mechanism controls the flow rate of the washing solution or saline solution needed for cleaning into the human body, and at the same time facilitates the filtration of adsorbed dirt to prevent subsequent blockage.

[0007] Preferably, the flow control and filtration mechanism includes a fixed plate disposed on the surface of the flow control tube, a pull rod slidably connected to the inner wall of the fixed plate, a pull plate disposed at the top end of the pull rod, and a U-shaped clamp disposed at the bottom end of the pull rod.

[0008] Furthermore, by setting a fixed plate, the movement of the pull rod is guided and supported; by setting a pull plate, pulling the pull plate drives the U-shaped clamp to move through the pull rod.

[0009] Preferably, a first return spring is sleeved on the surface of the pull rod, the top end of the first return spring is fixedly connected to the lower surface of the fixing plate, the bottom end of the first return spring is fixedly connected to the upper surface of the U-shaped clamp, and an adapter groove is opened on the inner wall of the flow control tube. A movable ball head is provided on the inner wall of the adapter groove, and the movable ball head is adapted to the adapter groove.

[0010] Furthermore, by setting a first reset spring, the U-shaped clamp head is driven to reset; by setting an adapter groove, space is provided for the movement of the movable ball head; and by setting the movable ball head, the flow of liquid is controlled.

[0011] Preferably, the surface of the flow control tube is provided with a rotating hole, and the inner wall of the rotating hole is rotatably connected to a rotating shaft. One end of the rotating shaft is fixedly connected to the surface of the movable ball head, and the other end of the rotating shaft is provided with a knob. The surface of the rotating shaft is provided with multiple positioning plates, which are adapted to the U-shaped clamp. The surface of the connecting tube is provided with a first one-way valve, and the surface of the flow guide tube is provided with a second one-way valve.

[0012] Furthermore, by setting a knob, rotating the knob drives the movable ball head to rotate through the rotating shaft. By setting a positioning plate, which cooperates with the U-shaped clamp, the rotating shaft is fixed as a whole. By setting a first one-way valve and a second one-way valve, liquid backflow is prevented.

[0013] Preferably, the surface of the filter box is provided with a mounting box, the inner bottom wall of the mounting box is provided with a micro motor, the output end of the micro motor passes through the lower surface of the mounting box and is provided with a drive wheel, the inner wall of the filter box is provided with a filter screen, and the inner wall of the filter screen is rotatably connected to a column.

[0014] Furthermore, by setting up an installation box, the micro motor is protected. By setting up the micro motor, the micro motor is started, and the output end of the micro motor drives the drive wheel to rotate. By setting up a filter screen, filtration is performed.

[0015] Preferably, the surface of the column is provided with a scraper, the lower surface of the scraper is in contact with the upper surface of the filter screen, and the surface of the column is provided with a driven wheel.

[0016] Preferably, the surface of the filter box is provided with small holes, and the driven wheel and the driving wheel are provided with the same belt, which is located in the small holes and adapted to the small holes.

[0017] Furthermore, by setting the same belt on the surfaces of the driven wheel and the driving wheel, the driving wheel drives the driven wheel to rotate via the belt, the driven wheel rotates to rotate the column, and the column rotates to rotate the scraper, thus completing the cleaning of the filter screen surface.

[0018] Preferably, the surface of the filter box is provided with a slag discharge hole, and the inner wall of the slag discharge hole is rotatably connected with a sealing flip plate, and fixing blocks are provided on both the front and rear sides of the sealing flip plate.

[0019] Preferably, the surface of the filter box is provided with a clearance groove, the inner top wall of the clearance groove is provided with a mounting groove, the inner top wall of the mounting groove is provided with a telescopic rod, the bottom end of the telescopic rod is provided with a positioning head, the upper surface of the fixing block is provided with a snap-fit ​​groove, and the positioning head is adapted to the snap-fit ​​groove.

[0020] Furthermore, by setting a slag discharge hole, it is easy to discharge the garbage on the surface of the filter screen; by setting a sealing flip plate, it is sealed; by setting an avoidance groove, it avoids the fixed block; and by setting a positioning head, it cooperates with the snap-fit ​​groove to achieve the positioning and fixing of the fixed block.

[0021] Preferably, a connecting rod is provided on the front side of the positioning head, and a through hole is provided on the surface of the filter box, with the connecting rod disposed in the through hole.

[0022] Preferably, a second return spring is sleeved on the surface of the telescopic rod, the top end of the second return spring is fixedly connected to the inner top wall of the mounting groove, and the bottom end of the second return spring is fixedly connected to the upper surface of the positioning head.

[0023] Furthermore, by setting a connecting rod, it is easy to pull the connecting rod to drive the positioning head to rise and disengage from the fixed block. By setting a second return spring, the positioning head is driven to lock and reset. By setting a through hole, the movement of the connecting rod is avoided.

[0024] In summary, the technical effects and advantages of this invention are as follows:

[0025] In this invention, by setting up infusion pipes and drain holes, it is convenient to introduce liquids into the human body. By setting up suction pipes and guide pipes, it is convenient to guide sewage into the filter box for filtration treatment to prevent subsequent pipe blockage. By setting up a flow control filtration mechanism, the flow rate of the washing solution or saline solution required for cleaning into the human body can be controlled, and at the same time, it is convenient to filter the adsorbed dirt to prevent subsequent blockage.

[0026] In this invention, a fixed plate is provided to guide and support the movement of the pull rod; a pull plate is provided to pull the U-shaped clamp head through the pull rod; a first return spring is provided to reset the U-shaped clamp head; an adapter groove is provided to provide space for the movement of the movable ball head; the movable ball head is provided to control the flow of liquid; a knob is provided to rotate the movable ball head through the rotating shaft; and a positioning plate is provided to cooperate with the U-shaped clamp head to fix the rotating shaft as a whole.

[0027] In this invention, a first one-way valve and a second one-way valve are provided to prevent liquid backflow. A mounting box is provided to protect the micro motor. The micro motor is activated, and its output drives the drive wheel to rotate. A filter screen is provided for filtration. The driven wheel and the drive wheel are connected by the same belt, so the drive wheel drives the driven wheel to rotate via the belt. The rotation of the driven wheel drives the column to rotate, and the rotation of the column drives the scraper to rotate, thus cleaning the surface of the filter screen. A slag discharge hole is provided to facilitate the discharge of debris from the surface of the filter screen.

[0028] In this invention, a sealing flip plate is used for sealing, an avoidance groove is used to avoid the fixing block, a positioning head is used to cooperate with the snap-fit ​​groove to fix the fixing block, a connecting rod is used to facilitate pulling the connecting rod to drive the positioning head to rise and disengage from the fixing block, a second return spring is used to drive the positioning head to snap-fit ​​and return, and a through hole is used to avoid the movement of the connecting rod. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional structural diagram of an embodiment of this application;

[0031] Figure 2 This is a three-dimensional structural diagram of the flow control and filtration mechanism in the embodiments of this application;

[0032] Figure 3 Examples of this application Figure 2 Enlarged structural diagram at point A;

[0033] Figure 4 This is a three-dimensional structural diagram of the suction pipe in an embodiment of this application;

[0034] Figure 5 Examples of this application Figure 4 Enlarged structural diagram at point B;

[0035] Figure 6 This is a three-dimensional structural diagram of the drive wheel in an embodiment of this application;

[0036] Figure 7 Examples of this application Figure 6 Enlarged structural diagram at point C;

[0037] Figure 8This is a three-dimensional structural diagram of the positioning head in an embodiment of this application.

[0038] In the diagram: 1. Infusion tube; 2. Anti-slip mat; 3. Drain hole; 4. Connecting pipe; 5. Flow control pipe; 6. Guide pipe; 7. Filter box; 8. Flow control filtration mechanism; 801. Fixing block; 802. Slag discharge hole; 803. Sealing flip plate; 804. Telescopic rod; 805. Clearance groove; 806. Connecting rod; 807. Positioning head; 808. Through hole; 809. First check valve; 810. Second check valve; 811. Adaptor groove; 812. 813. Movable ball head; 814. Rotating shaft; 815. Mounting box; 816. Pull plate; 817. First return spring; 818. Pull rod; 819. U-shaped clamp; 820. Positioning plate; 821. Knob; 822. Micro motor; 823. Drive wheel; 824. Belt; 825. Column; 826. Scraper; 827. Filter screen; 828. Snap-fit ​​groove; 829. Second return spring; 820. Fixing plate; 821. Suction pipe. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example: Reference Figure 1-8 The suction tube shown includes an infusion tube 1, a connecting tube 4 on the right side of the infusion tube 1, a flow control tube 5 on the right side of the connecting tube 4, multiple drain holes 3 on the left side of the infusion tube 1, a suction tube 9 on the inner wall of the infusion tube 1, a guide tube 6 on the inner wall of the suction tube 9, one end of the guide tube 6 penetrating the surface of the infusion tube 1 and having a filter box 7, an anti-slip pad 2 on the surface of the infusion tube 1, and a flow control filter mechanism 8 on the surface of the flow control tube 5.

[0041] With the above structure, the infusion tube 1 and drain hole 3 are provided to facilitate the introduction of liquid into the human body. The suction tube 9 and guide tube 6 are provided to facilitate the introduction of sewage into the filter box 7 for filtration treatment to prevent subsequent blockage of the pipes. The flow control filtration mechanism 8 is provided to control the flow rate of the washing solution or saline solution required for cleaning into the human body, and at the same time facilitates the filtration of adsorbed dirt to prevent subsequent blockage.

[0042] In a preferred embodiment of this invention, the flow control filtration mechanism 8 includes a fixing plate 829 disposed on the surface of the flow control tube 5. A pull rod 817 is slidably connected to the inner wall of the fixing plate 829. A pull plate 815 is disposed at the top end of the pull rod 817, and a U-shaped clamp 818 is disposed at the bottom end of the pull rod 817. By setting the fixing plate 829, the movement of the pull rod 817 is guided and supported. By setting the pull plate 815, pulling the pull plate 815 drives the U-shaped clamp 818 to move through the pull rod 817.

[0043] In this embodiment, a first return spring 816 is sleeved on the surface of the pull rod 817. The top end of the first return spring 816 is fixedly connected to the lower surface of the fixing plate 829, and the bottom end of the first return spring 816 is fixedly connected to the upper surface of the U-shaped clamp 818. An adapter groove 811 is provided on the inner wall of the flow control tube 5, and a movable ball head 812 is provided on the inner wall of the adapter groove 811. The movable ball head 812 is adapted to the adapter groove 811. By setting the first return spring 816, the U-shaped clamp 818 is driven to return to its original position. By setting the adapter groove 811, space is provided for the movable ball head 812 to move. By setting the movable ball head 812, the flow of liquid is controlled.

[0044] In a preferred embodiment of this invention, the surface of the flow control tube 5 has a rotating hole, and a rotating shaft 813 is rotatably connected to the inner wall of the rotating hole. One end of the rotating shaft 813 is fixedly connected to the surface of the movable ball head 812, and the other end of the rotating shaft 813 is provided with a knob 820. Multiple positioning plates 819 are provided on the surface of the rotating shaft 813, and the positioning plates 819 are adapted to the U-shaped clamp head 818. A first one-way valve 809 is provided on the surface of the connecting tube 4, and a second one-way valve 810 is provided on the surface of the guide tube 6. By setting the knob 820, rotating the knob 820 drives the movable ball head 812 to rotate via the rotating shaft 813. By setting the positioning plates 819, which cooperate with the U-shaped clamp head 818, the rotating shaft 813 is fixed as a whole. By setting the first one-way valve 809 and the second one-way valve 810, liquid backflow is prevented.

[0045] In a preferred embodiment of this invention, a mounting box 814 is provided on the surface of the filter box 7. A micro motor 821 is provided on the inner bottom wall of the mounting box 814. The output end of the micro motor 821 passes through the lower surface of the mounting box 814 and is provided with a drive wheel 822. A filter screen 826 is provided on the inner wall of the filter box 7, and a column 824 is rotatably connected to the inner wall of the filter screen 826. By providing the mounting box 814, the micro motor 821 is protected. By providing the micro motor 821, starting the micro motor 821, the output end of the micro motor 821 drives the drive wheel 822 to rotate, and filtration is performed by using the filter screen 826.

[0046] In this embodiment, a scraper 825 is provided on the surface of the column 824, and the lower surface of the scraper 825 is in contact with the upper surface of the filter screen 826. A driven wheel is provided on the surface of the column 824, and a small hole is opened on the surface of the filter box 7. The driven wheel and the driving wheel 822 are provided with the same belt 823, which is located in and adapted to the small hole. By providing the same belt 823 on the surfaces of the driven wheel and the driving wheel 822, the driving wheel 822 drives the driven wheel to rotate via the belt 823. The rotation of the driven wheel drives the column 824 to rotate, and the rotation of the column 824 drives the scraper 825 to rotate, thus completing the cleaning of the surface of the filter screen 826.

[0047] In a preferred embodiment of this invention, the filter box 7 has a slag discharge hole 802 on its surface. A sealing flip plate 803 is rotatably connected to the inner wall of the slag discharge hole 802. Fixing blocks 801 are provided on both the front and rear sides of the sealing flip plate 803. The filter box 7 has a clearance groove 805 on its surface. An installation groove is provided on the inner top wall of the clearance groove 805. A telescopic rod 804 is provided on the inner top wall of the installation groove. A positioning head 807 is provided at the bottom end of the telescopic rod 804. A snap-fit ​​groove 827 is provided on the upper surface of the fixing block 801. The positioning head 807 is compatible with the snap-fit ​​groove 827. By providing the slag discharge hole 802, it is easy to discharge debris from the surface of the filter screen 826. The sealing flip plate 803 provides a seal. The clearance groove 805 provides clearance for the fixing block 801. The positioning head 807, in conjunction with the snap-fit ​​groove 827, achieves the positioning and fixing of the fixing block 801.

[0048] In this embodiment, a connecting rod 806 is provided on the front of the positioning head 807, and a through hole 808 is provided on the surface of the filter box 7. The connecting rod 806 is disposed in the through hole 808, and a second return spring 828 is sleeved on the surface of the telescopic rod 804. The top end of the second return spring 828 is fixedly connected to the inner top wall of the mounting groove, and the bottom end of the second return spring 828 is fixedly connected to the upper surface of the positioning head 807. By providing the connecting rod 806, it is easy to pull the connecting rod 806 to drive the positioning head 807 to rise and disengage from the fixing block 801. By providing the second return spring 828, the positioning head 807 is driven to snap back into place. By providing the through hole 808, the movement of the connecting rod 806 is avoided.

[0049] Working principle:

[0050] A suction tube with a filter and rinsing device is used by the user. First, the user injects the required changing solution or saline into the infusion tube 1 through the flow control tube 5. The changing solution or saline is delivered into the infusion tube 1 through the movable ball head 812. When the flow rate of the entering changing solution or saline needs to be controlled, the pull plate 815 is pulled upward. The movement of the pull plate 815 drives the U-shaped clamp 818 to move through the pull rod 817, causing the U-shaped clamp 818 to separate from the positioning plate 819, releasing the restriction on the rotating shaft 813. At this time, the knob 820 is rotated, and the rotation of the knob 820 drives the rotating shaft 813 to rotate. 13. Rotation drives the movable ball head 812 to rotate, controlling the flow rate into the infusion tube 1. Under the same external pressure, when the flow hole on the movable ball head 812 changes its contact area with the inner wall of the adapter groove 811, the liquid entering the flow control tube 5 is first blocked by the surface of the movable ball head 812, then flows in through the gap between the flow hole on the surface of the movable ball head 812 and the adapter groove 811, and then flows out from the other end of the flow hole, slowing down the flow rate. As the reserved gap gradually decreases, the flow rate gradually slows down, and the liquid is discharged through the drain hole 3. When dirt accumulates inside, external equipment applies pressure, and the dirt is guided through the suction pipe 9 and guide pipe 6 onto the filter screen 826 inside the filter box 7 for filtration. When it is necessary to clean the dirt filtered from the surface of the filter screen 826, the micro motor 821 is activated. The output of the micro motor 821 drives the drive wheel 822 to rotate. Since the driven wheel and the drive wheel 822 are connected by the same belt 823, the drive wheel 822 drives the driven wheel to rotate via the belt 823. The rotation of the driven wheel drives the column 824 to rotate, and the rotation of the column 824 drives the scraper 825 to rotate, thus completing the cleaning of the surface of the filter screen 826. The cleaned debris will accumulate on the surface of the filter screen 826. At this time, pull the connecting rod 806 upward. The movement of the connecting rod 806 causes the telescopic rod 804 to shorten, compressing the second return spring 828, which causes the positioning head 807 to rise. At this time, the positioning head 807 is released from the restriction of the fixed block 801, which can drive the sealing flip plate 803 to flip and open the slag discharge hole 802, so that the dirt accumulated on the surface of the filter screen 826 can be manually cleaned. With the above structure, the flow rate of the washing fluid or saline solution needed for cleaning into the human body can be controlled, and the adsorbed dirt can be filtered to prevent subsequent clogging.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A suction tube with a filtering and rinsing device, comprising an infusion tube (1), characterized in that: A connecting pipe (4) is provided on the right side of the infusion tube (1), and a flow control pipe (5) is provided on the right side of the connecting pipe (4). Multiple drain holes (3) are provided on the left side of the infusion tube (1). A suction pipe (9) is provided on the inner wall of the infusion tube (1), and a flow guide pipe (6) is provided on the inner wall of the suction pipe (9). One end of the flow guide pipe (6) penetrates the surface of the infusion tube (1) and is provided with a filter box (7). An anti-slip pad (2) is provided on the surface of the infusion tube (1), and a flow control filter mechanism (8) is provided on the surface of the flow control pipe (5). The flow control and filtration mechanism (8) includes a fixing plate (829) disposed on the surface of the flow control tube (5), a pull rod (817) is slidably connected to the inner wall of the fixing plate (829), a pull plate (815) is disposed at the top of the pull rod (817), and a U-shaped clip (818) is disposed at the bottom of the pull rod (817). The surface of the pull rod (817) is fitted with a first return spring (816). The top end of the first return spring (816) is fixedly connected to the lower surface of the fixing plate (829), and the bottom end of the first return spring (816) is fixedly connected to the upper surface of the U-shaped clip (818). The inner wall of the flow control tube (5) is provided with an adapter groove (811). The inner wall of the adapter groove (811) is provided with a movable ball head (812). The movable ball head (812) is adapted to the adapter groove (811). The surface of the flow control tube (5) is provided with a rotating hole, and the inner wall of the rotating hole is rotatably connected to a rotating shaft (813). One end of the rotating shaft (813) is fixedly connected to the surface of the movable ball head (812), and the other end of the rotating shaft (813) is provided with a knob (820). The surface of the rotating shaft (813) is provided with multiple positioning plates (819), and the positioning plates (819) are adapted to the U-shaped clamp head (818). The surface of the connecting tube (4) is provided with a first one-way valve (809), and the surface of the flow guide tube (6) is provided with a second one-way valve (810).

2. The suction tube with a filtering and rinsing device according to claim 1, characterized in that: The surface of the filter box (7) is provided with a mounting box (814), and the inner bottom wall of the mounting box (814) is provided with a micro motor (821). The output end of the micro motor (821) passes through the lower surface of the mounting box (814) and is provided with a drive wheel (822). The inner wall of the filter box (7) is provided with a filter screen (826), and the inner wall of the filter screen (826) is rotatably connected to a column (824).

3. The suction tube with a filtering and rinsing device according to claim 2, characterized in that: The surface of the column (824) is provided with a scraper (825), the lower surface of the scraper (825) is in contact with the upper surface of the filter screen (826), and the surface of the column (824) is provided with a driven wheel.

4. The suction tube with a filtering and rinsing device according to claim 3, characterized in that: The filter box (7) has small holes on its surface. The driven wheel and the driving wheel (822) are provided with the same belt (823). The belt (823) is located in the small holes and is adapted to the small holes.

5. A suction tube with a filtering and rinsing device according to claim 1, characterized in that: The filter box (7) has a slag discharge hole (802) on its surface. The inner wall of the slag discharge hole (802) is rotatably connected to a sealing flip plate (803). Fixing blocks (801) are provided on both the front and rear sides of the sealing flip plate (803).

6. A suction tube with a filtering and rinsing device according to claim 5, characterized in that: The filter box (7) has a clearance groove (805) on its surface. The inner top wall of the clearance groove (805) has an installation groove. The inner top wall of the installation groove is provided with a telescopic rod (804). The bottom end of the telescopic rod (804) is provided with a positioning head (807). The upper surface of the fixing block (801) has a snap-fit ​​groove (827). The positioning head (807) is adapted to the snap-fit ​​groove (827).

7. A suction tube with a filtering and rinsing device according to claim 6, characterized in that: The positioning head (807) has a connecting rod (806) on its front side, and the filter box (7) has a through hole (808) on its surface. The connecting rod (806) is located in the through hole (808).

8. A suction tube with a filtering and rinsing device according to claim 6, characterized in that: The surface of the telescopic rod (804) is fitted with a second return spring (828). The top end of the second return spring (828) is fixedly connected to the inner top wall of the mounting groove, and the bottom end of the second return spring (828) is fixedly connected to the upper surface of the positioning head (807).

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