Suction head with variable section

Abstract

The invention relates to the technical field of medical instruments, in particular to a section-variable suction head which comprises a suction head body, a soft suction head capable of changing the shape is arranged at the far end of the suction head body, and an adjusting mechanism capable of adjusting the shape of the suction head is arranged on the suction head body. The adjusting mechanism comprises a form conversion device and a driving device, the form conversion device is used for adjusting the shape of the suction head, and the driving device provides power for the form conversion device. The suction head is a flexible flat head in a natural state, the form conversion device is a supporting ring, the supporting ring is arranged in the suction head body in a sliding mode, the end, away from the suction head, of the supporting ring is connected with the driving device, and the driving device is used for driving the supporting ring to slide in the length direction of the suction head. The suction head adapts to a narrow channel through the prefabricated flat head and the lower arc-shaped structure, shape conversion of the suction head is achieved based on the built-in adjusting structure, the suction head can be suitable for a narrow surgical field, and the large section of the round head can be provided according to needs so that the effects of efficiently removing smoke and dredging blockage in time can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a suction head with a variable cross-section. Background Art

[0002] In orthopedic surgery, particularly when working within deep, narrow surgical fields (such as the spine, joint spaces, and the spinal canal), surgical suction devices are crucial for maintaining a clear field of vision. Currently, the widely used suction tips are flexible tubular structures (circular cross-section), which are difficult to fit into narrow channels. This cumbersome procedure forces the surgeon to manually flatten the tip to create an irregular, flat opening for suction. This crude technique not only makes the instrument fragile but also significantly increases the risk of clogging (due to the collapsed lumen and irregular edges, which easily trap bone debris, blood clots, or viscous tissue fluid). It also severely reduces the efficiency of aspirating exhaust gases from electrocautery. Once blocked, unclogging requires the use of external cleaning rods, which can be cumbersome (often requiring both cauterization and repeated flushing), incomplete unblocking (recurring blockage), and interruptions to the surgical process. Therefore, there is a lack of prefabricated, stable flat tip designs specifically designed for confined spaces, and there is no immediate and effective way to address the resulting blockage and inefficient smoke extraction during surgery. An innovative solution is urgently needed that combines the depth of a prefabricated flat tip with the ability to expand the opening on demand.

[0003] A search revealed that while some prior art patents address improvements in suction efficiency or anti-clogging, none address the core issue of adaptability to narrow surgical fields. For example, Chinese invention patent (CN110368539B) discloses a suction head for an aspirator. This head utilizes a deployable trumpet-shaped suction hood at the distal end of the suction head body to enhance surgical smoke extraction efficiency. This hood retracts into the body during liquid aspiration, maintaining a tubular channel. While this solution achieves a variable form factor, the deployed trumpet-shaped structure requires additional radial space, making it impossible to penetrate ultra-narrow surgical fields such as the spine and joint spaces. Furthermore, the collapsed structure maintains a fixed circular cross-section, failing to address the issue of adaptability to narrow channels. Another example is the anti-clogging aspirator disclosed in Chinese invention patent (CN110755701A). This aspirator utilizes a tapered flow path that gradually expands from the suction port to the tube diameter to reduce clogging. While this structure is simple, the expanding tube requires a linear extension, making it difficult to conform to anatomical structures in curved and narrow surgical fields. Furthermore, the tapered opening remains circular in cross-section, making it difficult to compress to accommodate extremely narrow cavities.

[0004] In summary, the main drawback of the above-mentioned solutions is that they are based on rigid shapes such as circular or trumpet-shaped designs, failing to overcome the limitation of "unchangeable cross-sectional shapes", resulting in their inability to operate in narrow surgical fields. To address this, the applicant invented a suction head with a dynamically switchable cross-sectional shape. Summary of the Invention

[0005] The purpose of the present invention is to provide a suction head with a variable cross-section, which adapts to narrow channels through a prefabricated flat head and a lower arc structure, and realizes the shape transformation of the suction head based on a built-in adjustment structure. It is not only suitable for narrow surgical fields, but also can provide a round head with a large cross-section as needed to achieve the effect of efficiently removing smoke and immediately clearing blockages.

[0006] The present invention is achieved by providing a variable-section suction head, comprising a suction head body, a soft suction head capable of changing shape provided at the distal end of the suction head body, and an adjustment mechanism capable of adjusting the shape of the suction head provided on the suction head body; The adjusting mechanism comprises a form conversion device and a driving device. The form conversion device is used to adjust the shape of the suction head, and the driving device provides power for the form conversion device.

[0007] Furthermore, the suction head is a flexible flat head in its natural state, and the shape conversion device is a support ring, which is slidably arranged in the suction head body. The end of the support ring away from the suction head is connected to the driving device, and the driving device is used to drive the support ring to slide along the length direction of the suction head and the suction head body.

[0008] Furthermore, the suction head is a flexible flat head in its natural state, and the shape conversion device includes multiple support rods, one end of the multiple support rods is simultaneously rotatably connected to the driving device, and the other end of the multiple support rods is simultaneously rotatably connected to the inner wall of the suction head.

[0009] Furthermore, the suction head is flexible and has an arc-shaped cross-section structure that can adapt to a narrow surgical field; the shape conversion device is an arc-shaped slide that slides along the suction head body and the length direction of the suction head.

[0010] Furthermore, the driving device includes a sealed shell 1, a piston 1, a connecting rod, a connecting pipe, a sealed shell 2, a piston 2, a push rod and a push block; the sealed shell 1 is arranged in the suction head body, the piston 1 is slidably arranged in the sealed shell 1, one end of the connecting rod is connected to the piston 1, and the other end of the connecting rod is connected to the shape conversion device; the sealed shell 2 is installed on the outer wall of the suction head body, the piston 2 is slidably arranged in the sealed shell 2, one end of the push rod is connected to the piston 2, and the other end of the push rod is connected to the push block; the sealed shell 1 and the sealed shell 2 are connected by a connecting pipe.

[0011] Furthermore, the inner side wall of the arc-shaped slide is slidably connected to the suction head body and the outer side wall of the suction head, and the driving device includes a connecting rod and a slider; one end of the connecting rod is fixedly connected to the end of the arc-shaped slide, and the other end of the connecting rod is fixedly connected to the slider, and the slider is slidably connected to the outer side wall of the suction head body.

[0012] Furthermore, the suction head body is composed of two sections of rotating connected pipes, and the two sections of the suction head body are kept connected; the sealed shell one and the sealed shell two are respectively installed on the two sections of the suction head body, and the connecting pipe passes through the rotating shaft of the two sections of the suction head body to realize the connection between the sealed shell one and the sealed shell two.

[0013] Furthermore, the two sections of the suction head body are connected by a rotating shaft, and the rotating shaft is hollow so that the two sections of the suction head body remain long and continuous.

[0014] Furthermore, the proximal suction head body is provided with an arc-shaped blocking plate, and a bypass pipe is provided on the side wall of the proximal suction head body close to the distal suction head body, and a sealing unit 1 is provided in the bypass pipe; a sealing unit 2 is provided on the side wall of the distal suction head body. When a 90-degree angle is formed between the two sections of the suction head body, the sealing unit 1 and the sealing unit 2 can push each other open, so that the distal suction head body is connected to the bypass pipe.

[0015] Furthermore, the sealing unit 1 includes a sealing plate and a return spring; one end of the return spring is fixedly connected to the side wall of the opening of the suction head body, and the other end of the return spring is connected to the sealing plate. In a normal state, the sealing plate is pulled by the return spring to fit the inner wall of the suction head body; The second sealing unit includes a threaded rod and a sealing ring. The sealing ring is fixedly installed at the end of the bypass pipe. The threaded rod consists of two threaded sections with different diameters. The threaded section with a larger diameter is connected to the sealing ring, and the threaded section with a smaller diameter is connected to the side wall of the bypass pipe. When the side wall opening of the suction head body is connected to the bypass pipe, the threaded rod can be rotated to allow the sealing plate to be pushed open.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention configures the suction tip into a flexible flat head or a flexible lower arc structure, and provides a shape conversion device to adjust the shape and size of the suction tip. This not only achieves adaptability to narrow surgical fields, but also utilizes the deformation effect of the suction tip to promptly dredge them. In addition, the deformation effect of the suction tip can promptly discharge the smoke generated by the electrosurgical scalpel, thereby improving surgical efficiency. 2. The suction head is designed as a flexible flat head, and a support ring is installed inside the suction head body. The support ring is connected to a drive device, which drives the support ring to move along the length of the suction head and the suction head body. In this way, under normal conditions, the flat suction head can be used in a narrow surgical field. When the suction head is blocked or smoke generated by electrocautery needs to be sucked away, the support ring can be used to prop the suction head open, thereby sucking the blockage or large amounts of smoke into the suction head body. 3. The suction head is set to a flexible flat head. At the same time, the inner wall of the suction head and the front end of the driving device are rotatably connected through two support rods. The driving device causes the support rods to open the suction head, thereby sucking the blockage or a large amount of smoke into the suction head body; 4. The suction head body is configured as two sections that are rotatably connected, and the two sections of the suction head are kept in a long-lasting state. This allows the surgeon to adjust the angle of the distal suction head body to avoid blocking the surgical field and facilitate observation by others. In addition, the connecting tube in the drive device is passed through the rotating shaft position of the two suction head bodies. This allows the surgeon to hold the rear suction head body and push the push block to still adjust the shape of the suction head; 5. The side walls of the two suction head bodies are set to be rotatably connected, and the rotation axis is hollow. In this way, not only can the front suction head body be adjusted in the angle range of 0-90°, but no matter how the angles of the two suction heads are adjusted, the two suction head bodies can maintain the same opening connection; 6. A bypass pipe is provided on the suction head body at the rear end, and a sealing unit 2 is provided in the bypass pipe. At the same time, a sealing unit 1 corresponding to the sealing unit 2 is installed on the suction head body at the front end. When the two sections of the suction head body are adjusted to a 90° angle, the two sections of the suction head body can be connected through the bypass pipe under the action of the sealing unit 2. The suction head body can also be adjusted in an angle range of 0-90° to avoid blocking the surgical field and facilitate observation by others. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a side sectional view of a variable-cross-section suction head provided in Example 1 of the present invention; Figure 2 1 is a front view of the suction tip provided in Example 1 of the present invention; Figure 3 This is a side cross-sectional view of a suction head with a variable cross-section provided in Example 2 of the present invention when the suction head is not expanded; Figure 4 This is a side cross-sectional view of a suction head with a variable cross-section provided by Example 2 of the present invention when the suction head is expanded; Figure 5 This is a side cross-sectional view of a suction head with a variable cross-section provided by Example 3 of the present invention when the suction head is not expanded; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 2 is a front view of the suction tip provided in Example 3 of the present invention; Figure 8 This is a side cross-sectional view of a suction head with a variable cross-section provided by Example 3 of the present invention when the suction head is expanded; Figure 9This is a side sectional view of a variable-section suction head provided by Example 4 of the present invention, wherein the front end thereof has a circular cross-section; Figure 10 This is a side sectional view of a variable-section suction head provided by Example 4 of the present invention, wherein the front end cross-section is a downward arc; Figure 11 2 is a front view of the suction head position in Example 4 of the present invention; Figure 12 is a side sectional view of a variable-section suction head in Example 5 of the present invention, wherein the front end thereof has a circular cross-section; Figure 13 This is a side sectional view of a variable-section suction head in Example 5 of the present invention, wherein the front end cross-section is a downward arc; Figure 14 is a front view of the suction head position in Example 5 of the present invention; Figure 15 is a side sectional view of a variable-cross-section suction head in Example 6 of the present invention; Figure 16 This is a side sectional view of a front end suction head body of a variable cross-section suction head in Example 6 of the present invention when rotating; Figure 17 is a top cross-sectional view of a variable-cross-section suction head in Example 6 of the present invention; Figure 18 is a side sectional view of a variable-cross-section suction head in Example 7 of the present invention; Figure 19 is a top sectional view of a variable-cross-section suction head in Example 7 of the present invention; Figure 20 is a side sectional view of a variable-cross-section suction head in Example 8 of the present invention; Figure 21 yes Figure 20 Enlarged view of point A in the middle; Figure 22 This is a side sectional view of a variable-section suction head in Example 8 of the present invention when the two suction head bodies form a 90° angle; Figure 23 yes Figure 22 Enlarged view of point A in the middle.

[0018] Reference numerals in the above drawings: 1. Suction head; 2. Suction head body; 3. Slider; 4. Arc plate; 5. Support ring; 6. Connecting rod; 7. Sealing housing 1; 8. Piston 1; 9. Sealing housing 2; 10. Push block; 11. Push rod; 12. Piston 2; 13. Connecting pipe; 14. Support rod; 15. Arc slide; 16. Drive block; 17. Sealing plate; 18. Return spring; 19. Bypass pipe; 20. Threaded rod; 21. Sealing ring; 22. Positioning block. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0021] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] Reference Figure 1-Figure 23 The figure shows a preferred embodiment of the present invention.

[0023] Example 1: A variable cross-section suction head, such as Figure 1 and Figure 2 As shown, it includes a suction head body 2, and a suction head 1 made of silicone is installed at the distal end of the suction head body 2, and the suction head 1 is a flat head as shown in the figure, and the length of the flat part is about 5 cm; an adjustment mechanism is installed on the suction head body 2, and the adjustment mechanism can expand the suction head 1.

[0024] The adjustment mechanism mainly consists of a shape conversion device and a drive device. In this embodiment, the shape conversion device is a support ring 5, the outer wall of which is slidably connected to the inner wall of the suction head body 2. To prevent the support ring 5 from damaging the suction head 1 when it is stretched, the distal end of the support ring 5 is configured to have a rounded corner.

[0025] The drive mechanism of this embodiment primarily consists of a curved plate 4 and a slider 3. The distal end of the curved plate 4 is fixedly connected to the proximal end of the support ring 5. A strip-shaped through-slot (not labeled in the figure) is provided on the sidewall of the suction head body 2 to facilitate the sliding of the slider 3 along the strip. The bottom surface of the slider 3 is fixedly connected to the side of the curved plate 4. The primary function of the curved plate 4 is to ensure a sealed interior of the suction head body 2. As the slider 3 moves, although the curved plate 4 slides synchronously, it always blocks the strip-shaped through-slot, preventing fluids such as blood and smoke from escaping through the strip.

[0026] The proximal end of the suction head body 2 of this embodiment can be connected to an existing suction device, which will not be described in detail here.

[0027] Working principle: The surgeon uses a flat suction head 1 to operate on narrow surgical fields such as the spine and joint space. When the suction head 1 is blocked or the smoke generated by the electric knife burning needs to be sucked away, the surgeon only needs to hold the suction head body 2 and push the slider 3 with his fingers. At this time, the support ring 5 enters the suction head 1 under the action of the arc plate 4, thereby expanding the suction head 1. At this time, the problem of suction head 1 being blocked is solved and the smoke can smoothly enter the suction head body 2.

[0028] Example 2: A variable cross-section suction head, such as Figure 3 and Figure 4 As shown, the main difference between this embodiment and embodiment 1 is that the structure of the driving device is different. This embodiment uses a hydraulic method to drive the support ring 5 to move. Specifically, the driving device is mainly composed of a sealing shell 7, a piston 8, a connecting rod 6, a connecting pipe 13, a sealing shell 9, a piston 12, a push rod 11 and a push block 10; the shape of the sealing shell 7 is the same as that of the support ring 5, and the cross-section is annular. The piston 8 is also an annular piston. The piston 8 is slidably arranged in the sealing shell 7. The side of the piston 8 close to the support ring 5 is connected to the support ring 5 through the connecting rod 6. The sealing shell 9 is fixedly installed on the outer wall of the suction head body 2. The piston 12 is slidably arranged in the sealing shell 9. The side of the piston 12 away from the support ring 5 is connected to the push block 10 through the push rod 11. The push block 10 is slidably connected to the outer wall of the suction head body 2. The sealing housing 1 7 is connected to the sealing housing 2 9 by a connecting pipe 13. A sealed space formed between the piston 1 8, the sealing housing 1 7, the connecting pipe 13, the sealing housing 2 9 and the piston 2 12 is filled with liquid. In this way, by pushing the push block 10, the support ring 5 can be slid toward the distal end and the suction head 1 can be opened by the action of hydraulic pressure.

[0029] By adopting the solution of this embodiment, it is possible to avoid providing strip-shaped through grooves, thereby reducing the risk of leakage of fluids such as blood and smoke.

[0030] Example 3: A variable cross-section suction head, such as Figure 5-Figure 8 As shown, the difference between this embodiment and embodiment 2 is mainly in the structure of the form conversion device. Figure 5 and Figure 6As shown, the form-shifting device of this embodiment comprises two support rods 14, one end of which is hinged to the inner wall of the suction head 1, and the other end is hinged to the connecting rod 6 of the drive device. To ensure that the two support rods 14 can smoothly propel the suction head 1 open when the connecting rod 6 moves forward, this embodiment places a sealed housing 7 at the axis of the connection between the suction head body 2 and the suction head 1. This allows the two support rods 14 to be symmetrically distributed around the connecting rod 6. The sealed housing 7 is connected to the suction head body 2 via a rod (not labeled in the figure), thereby securing the sealed housing 7.

[0031] The driving device of this embodiment is the same as that of embodiment 2. Under the action of hydraulic pressure, the piston 18 drives the connecting rod 6 to move forward. Since the support rod 14 is hinged to the connecting rod 6, when the connecting rod 6 slides toward the distal end, the two support rods 14 can smoothly open the suction head 1 ( Figure 8 ).

[0032] Example 4: A variable cross-section suction head, such as Figures 9-11 As shown, the main difference between this embodiment and embodiments 1-3 is the shape of the suction head 1. The suction head 1 of this embodiment has a lower arc cross section and is also made of a soft material such as silicone. The suction head 1 and the suction head body 2 have the same cross-sectional arc radius. Figure 9 and Figure 11 As shown, the inner side wall of the arc-shaped slide plate 15 is in sliding contact with the outer side wall of the suction head 1 and the outer side wall of the suction head body 2. By adjusting the position of the arc-shaped slide plate 15, the shape of the entire front end of the suction head can be adjusted.

[0033] In this embodiment, the driving device is a driving block 16, which slides along the outer wall of the suction head body 2. For ease of operation, the driving block 16 and the arc-shaped slide 15 are connected by a rod (not marked in the figure).

[0034] Since the arc-shaped slide 15 of this embodiment has a larger cross-sectional radius than the cross-sectional radius of the suction head body 2, when the arc-shaped slide 15 moves to the rear end, as shown in FIG. Figure 10 As shown, the arc-shaped slide plate 15 is slidably sleeved on the outer side wall of the suction head body 2.

[0035] Example 5: A variable cross-section suction head, such as Figure 12-14 As shown, the suction head 1 of this embodiment is the same as that of embodiment 4, the main difference being the diameter of the arc section of the arc-shaped slide 15 and the structure of the driving device. Figure 14As shown, the arc diameter of the cross section of the arc-shaped slide 15 of this embodiment is smaller than the internal inner diameter of the suction head 1 and the suction head body 2, and the outer wall of the arc-shaped slide 15 is in sliding contact with the inner wall of the suction head body 2. Since the arc-shaped slide 15 is located inside the suction head body 2 when moving toward the proximal end, the driving device of this embodiment is exactly the same as the driving device structure of Example 2 and Example 3, and no further details will be given here.

[0036] Example 6: A suction head with a variable cross-section. In order to facilitate observation by others during the operation, this embodiment provides a structure that allows the suction head to be bent, such as Figure 15-17 As shown, this embodiment comprises a suction head body 2 comprised of two sections, connected by a spherical shell of different diameters. The distal suction head is centered about the center of the spherical shell, and one side of the spherical shell is open. When the distal suction head body 2 rotates, the two suction head bodies 2 remain connected. The suction head 1 in this embodiment can be any of the shapes described in Examples 2-4, and the shape conversion device is the same as in Examples 2-4.

[0037] The structure of the driving device is the same as that of Example 2, but the installation position is different. The sealing shell 17 and the piston 18 in the driving device are both located in the distal end of the suction head body 2. The sealing shell 29, the piston 212, the push rod 11 and the push block 10 are all located on the outer wall of the proximal end of the suction head body 2. The connecting pipe 13 is composed of two sections, one section is located in the distal end of the suction head body 2 and is connected to the sealing shell 17, and the other section is located outside the suction head body 2 and is connected to the sealing shell 29. The connection point of the two sections of the connecting pipe 13 is located at the rotating shaft of the suction head body 2. Specifically, one connecting pipe 13 is inserted into the other connecting pipe 13 and is rotatably connected. The two connecting pipes 13 are respectively fixedly connected to the two suction head bodies 2, so that when the suction head body 2 rotates, the two connecting pipes 13 can remain long-passing, while also limiting the rotation of the distal end of the suction head body 2 in a planar direction.

[0038] During use, the operator holds the suction head body 2 at the proximal end and adjusts the shape of the suction head 1 by pushing the push block 10 .

[0039] Example 7: A variable-section suction head. Because the connection state of the spherical shell of the suction head body 2 must be considered in Example 6, the rotation angle of the distal suction head body 2 is limited, and a 90° bend cannot be achieved. Therefore, in this embodiment, the side walls of the two suction head bodies 2 are connected by a rotating shaft. The rotating shaft is a hollow shaft that connects the two suction head bodies 2. In this way, no matter how the distal suction head body 2 rotates, the two suction head bodies 2 are always connected. There are three advantages to connecting the two suction head bodies 2 using the method of this embodiment: 1. The suction head can be adjusted to a 90° bend, expanding the rotation angle range; 2. The opening of the connection is constant and will not affect the negative pressure; 3. The connecting tube 13 can pass through any position of the side wall of the distal suction head body 2. If the connecting tube 13 is defined as a flexible tube, it will not affect the rotation of the distal suction head body 2.

[0040] The installation positions of the various components of the driving device of this embodiment are the same as those of embodiment 6, and will not be described in detail here.

[0041] Example 8: A variable cross-section suction head. This example provides another solution in which the suction head is bent 90 degrees and the two suction head bodies 2 remain connected. Figure 20-23 In this embodiment, the side wall of the distal end of the suction head body 2 is provided with an outwardly protruding channel, and the side wall of the proximal end of the suction head body 2 is provided with a bypass pipe 19. The opening direction of the bypass pipe 19 is the same as the opening direction of the proximal end of the suction head body 2. When the distal end of the suction head body 2 is rotated to a 90° bend, the opening on the distal end of the suction head body 2 is connected to the opening of the bypass pipe 19. The specific method can be seen in FIG. Figure 23 .

[0042] The sealing unit 1 and the sealing unit 2 are installed in the opening and the bypass pipe 19 respectively. The structure of the sealing unit 1 is as follows: Figure 21 As shown, it is mainly composed of a sealing plate 17 and a return spring 18. One end of the return spring 18 is fixedly connected to the side wall of the opening, and the other end is fixedly connected to the sealing plate 17. When the suction head is not bent, the sealing plate 17 is pulled by the return spring 18 to block the opening.

[0043] The sealing unit 2 is mainly composed of a threaded rod 20 and a sealing ring 21; the sealing ring 21 is fixedly installed on the inner wall of the bypass pipe 19, as shown in FIG. Figure 23 As shown, the threaded rod 20 is composed of two threaded sections with different radii. The diameter of the section close to the sealing ring 21 is larger, and the diameter of the section away from the sealing ring 21 is smaller. The section with the larger diameter of the threaded rod 20 is threadedly connected to the side wall of the bypass pipe 19. At the same time, a positioning block 22 is provided on the side wall of the suction head body 2. The positioning block 22 is sleeved on the section with the smaller diameter of the threaded rod 20. The through hole of the sealing ring 21 matches the section with the larger diameter of the threaded rod 20. In the initial state (such as Figure 21 ), the front end of the threaded rod 20 blocks the sealing ring 21 to prevent the fluid from flowing out of the bypass pipe 19.

[0044] The suction head 1 structure, the hydraulic drive device structure and the shape conversion device structure of the above-mentioned embodiment can all be used in this embodiment and will not be described in detail here.

[0045] Working principle: When the suction head is not bent or adjusted at a small angle, the two suction head bodies 2 are connected front to back. At this time, the sealing plate 17 blocks the opening position, and the larger diameter section of the threaded rod 20 blocks the sealing ring 21. When the suction head is bent at 90 degrees, Figure 22 As shown, the arc surface on the proximal suction head body 2 blocks the opening of the distal suction head body 2, and the opening is connected to the bypass pipe 19. The operator only needs to rotate the threaded rod 20 to move the threaded rod 20 toward the opening and push open the sealing plate 17. While pushing open the sealing plate 17, the larger diameter section of the threaded rod 20 is separated from the sealing ring 21. At this time, the fluid can enter the proximal suction head body 2 through the opening and the bypass pipe 19.

[0046] It should be noted that no matter what kind of adjustment mechanism is used in the present application, as long as the suction head 1 can be deformed, regardless of whether it can be bent, such an overall structure of the suction head is within the scope of protection of the present application.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A variable cross-section suction head, comprising a suction head body (2), characterized in that: A soft suction head (1) capable of changing its shape is provided at the distal end of the suction head body (2), and an adjustment mechanism capable of adjusting the shape of the suction head (1) is provided on the suction head body (2); The adjustment mechanism comprises a form conversion device and a driving device, wherein the form conversion device is used to adjust the shape of the suction head (1), and the driving device provides power for the form conversion device.

2. A variable cross-section suction head according to claim 1, characterized in that: The suction head (1) is a flexible flat head in a natural state, the shape conversion device is a support ring (5), the support ring (5) is slidably arranged in the suction head body (2), and the end of the support ring (5) away from the suction head (1) is connected to a driving device, and the driving device is used to drive the support ring (5) to slide along the length direction of the suction head (1) and the suction head body (2).

3. A variable cross-section suction head according to claim 1, characterized in that: The suction head (1) is a flexible flat head in a natural state, and the shape conversion device comprises a plurality of support rods (14), one end of the plurality of support rods (14) is simultaneously rotatably connected to the driving device, and the other end of the plurality of support rods (14) is simultaneously rotatably connected to the inner wall of the suction head (1).

4. A variable cross-section suction head according to claim 1, characterized in that: The suction head (1) is flexible and has an arc-shaped cross-section structure that can adapt to a narrow surgical field; the form conversion device is an arc-shaped slide plate (15) that slides along the length direction of the suction head body (2) and the suction head (1).

5. A variable cross-section suction head according to any one of claims 2 to 4, characterized in that: The driving device comprises a sealing shell (7), a piston (8), a connecting rod (6), a connecting pipe (13), a sealing shell (9), a piston (12), a push rod (11) and a push block (10); the sealing shell (7) is arranged in the suction head body (2), the piston (8) is slidably arranged in the sealing shell (7), one end of the connecting rod (6) is connected to the piston (8), and the other end of the connecting rod (6) is connected to the form conversion device; the sealing shell (9) is installed on the outer wall of the suction head body (2), the piston (12) is slidably arranged in the sealing shell (9), one end of the push rod (11) is connected to the piston (12), and the other end of the push rod (11) is connected to the push block (10); the sealing shell (7) and the sealing shell (9) are connected through a connecting pipe (13).

6. A variable cross-section suction head according to claim 4, characterized in that: The inner side wall of the arc-shaped slide (15) is slidably connected to the outer side wall of the suction head body (2) and the suction head (1), and the driving device includes a connecting rod and a slider (3); one end of the connecting rod is fixedly connected to the end of the arc-shaped slide (15), and the other end of the connecting rod is fixedly connected to the slider (3), and the slider (3) is slidably connected to the outer side wall of the suction head body (2).

7. A variable cross-section suction head according to claim 5, characterized in that: The suction head body (2) is composed of two sections of rotatably connected pipes, and the two sections of the suction head body (2) are kept connected; the sealing shell (1) and the sealing shell (2) are respectively installed on the two sections of the suction head body (2), and the connecting pipe (13) passes through the rotating shafts of the two sections of the suction head body (2) to realize the connection between the sealing shell (1) and the sealing shell (2) (9).

8. A variable cross-section suction head according to claim 7, characterized in that: The two sections of the suction head body (2) are connected by means of a rotating shaft, and the rotating shaft is hollow so that the two sections of the suction head body (2) remain long and continuous.

9. A variable cross-section suction head according to claim 7, characterized in that: The proximal suction head body (2) is provided with an arc-shaped blocking plate, and a bypass pipe (19) is provided on the side wall of the proximal suction head body (2) close to the distal suction head body (2), and a sealing unit 1 is provided in the bypass pipe (19); the distal suction head body (2) is provided with a sealing unit 2 on the side wall, and when a 90-degree angle is formed between the two sections of the suction head body (2), the sealing unit 1 and the sealing unit 2 can be pushed open to each other, so that the distal suction head body (2) is connected to the bypass pipe (19).

10. A variable cross-section suction head according to claim 9, characterized in that: The sealing unit 1 includes a sealing plate (17) and a return spring (18); one end of the return spring (18) is fixedly connected to the side wall of the opening of the suction head body (2), and the other end of the return spring (18) is connected to the sealing plate (17). In a normal state, the sealing plate (17) is subjected to the pulling force of the return spring (18) and is in contact with the inner side wall of the suction head body (2); The second sealing unit comprises a threaded rod (20) and a sealing ring (21). The sealing ring (21) is fixedly mounted on the end of the bypass pipe (19). The threaded rod (20) is composed of two threaded sections with different diameters. The threaded section with a larger diameter is connected to the sealing ring (21), and the threaded section with a smaller diameter is connected to the side wall of the bypass pipe (19). When the side wall opening of the suction head body (2) is connected to the bypass pipe (19), the threaded rod (20) can be rotated to allow the threaded rod (20) to push open the sealing plate (17).

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