Variable cross-section suction head

Abstract

The present application relates to the technical field of medical devices, in particular to a variable-section suction head, comprising a suction head body, a soft suction head capable of changing shape being arranged at the distal end of the suction head body, and an adjusting mechanism capable of adjusting the shape of the suction head being arranged on the suction head body; the adjusting mechanism comprises a shape conversion device and a driving device, the shape conversion device is used for adjusting the shape of the suction head, and the driving device provides power for the shape conversion device. The suction head is a flexible flat head in a natural state, the shape conversion device is a supporting ring, the supporting ring is slidingly arranged in the suction head body, one end of the supporting ring away from the suction head is connected with the driving device, and the driving device is used for driving the supporting ring to slide along the length direction of the suction head. The suction head is adapted to narrow passages through a preformed flat head and an arc-shaped structure, and shape conversion of the suction head is realized based on the built-in adjusting structure, so that the suction head can not only be suitable for narrow surgical fields, but also can provide a round head with a large section according to needs to achieve the effects of efficient removal of smoke and instant unblocking of blockages.

Description

TECHNICAL FIELD

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

[0002] In orthopedic surgery, especially when operating in deep and narrow surgical fields (such as the spine, joint space, and intraspinal space), a surgical suction device is a key instrument for maintaining a clear field of vision. The current clinical suction head is a soft tubular structure (circular cross-section), which is difficult to adapt to narrow channels, forcing the operator to pinch the front end of the device by hand to temporarily form an irregular flat opening for suction. This rough operation not only causes the device to be easily damaged, but also significantly increases the risk of blockage (due to the collapse of the lumen after pinching, irregular edges, easy to block bone debris, blood clots, or viscous tissue fluid), and severely weakens the efficiency of the electric knife in burning and sucking exhaust gas. Once blocked, it completely relies on external sticks to clear, which is complicated (often requires burning and repeated flushing), incomplete (clearing but blocking again), and interrupts the surgical process. Therefore, there is a lack of pre-made stable flat head structure designed for narrow spaces in clinical practice, and there is no effective solution to the problem of blockage and low smoke exhaust efficiency in surgery. Therefore, an innovative solution that combines the depth of the pre-made flat head and the ability to expand the opening on demand is urgently needed.

[0003] After searching, it was found that although some existing patents have improved the suction efficiency or anti-blocking, they have not overcome the core problem of adapting to narrow surgical fields: for example, a suction head for a suction device disclosed in Chinese invention patent (CN110368539B) improves the surgical smoke suction efficiency by setting an expandable horn-shaped suction cover at the distal end of the suction head body, and stores it in the body when sucking liquid to maintain the tubular channel. Although this scheme realizes variable shape, the horn-shaped structure after expansion needs to increase the radial space, and it cannot be deeply inserted into the super-narrow surgical field such as the spine and joint space, and the fixed circular cross-section in the storage state does not solve the problem of adaptability to narrow channels. For example, a blockage-preventing suction device disclosed in Chinese invention patent (CN110755701A) uses a tapered flow channel design from the suction port to the gradually expanding pipe diameter to reduce blockage. Although this structure is simple, the gradually expanding pipe body needs to extend straight, which cannot fit the anatomical structure in a curved and narrow surgical field, and the small end of the tapered shape is still a circular cross-section, which cannot be compressed to adapt to the extremely narrow cavity.

[0004] In summary, the main defect of the above-mentioned scheme is that the rigid shape such as circular / horn-shaped is used as the design basis, which does not break through the limitation of "unchangeable cross-sectional shape", resulting in the inability to act on narrow surgical field space. Therefore, the applicant has invented a suction head with dynamically switchable cross-sectional shape. SUMMARY

[0005] The variable-section suction head is capable of adapting to narrow channels through a preformed flat head and a lower arc-shaped structure, and realizes shape conversion of the suction head based on a built-in adjusting structure, so that the suction head can not only be applied to narrow operation fields, but also provide a round head with a large section according to needs to achieve the effects of efficient smoke removal and instant unblocking.

[0006] The variable-section suction head comprises a suction head body, a soft suction head capable of changing shape is arranged at a distal 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.

[0007] The adjusting mechanism comprises a shape conversion device and a driving device, the shape conversion device is used for adjusting the shape of the suction head, and the driving device provides power for the shape conversion device.

[0008] Further, the suction head is a flexible flat head in a natural state, the shape conversion device is a supporting ring, the supporting ring is slidingly arranged in the suction head body, one end of the supporting ring away from the suction head is connected with the driving device, and the driving device is used for driving the supporting ring to slide along the length direction of the suction head and the suction head body.

[0009] Further, the suction head is a flexible flat head in a natural state, the shape conversion device comprises a plurality of supporting rods, one end of the plurality of supporting rods is simultaneously rotationally connected with the driving device, and the other end of the plurality of supporting rods is simultaneously rotationally connected with the inner wall of the suction head.

[0010] Further, the suction head is flexible and can adapt to an arc-shaped section structure of a narrow operation field; and the shape conversion device is an arc-shaped sliding plate sliding along the length direction of the suction head body and the suction head.

[0011] Further, the driving device comprises a sealing shell one, a piston one, a connecting rod, a connecting pipe, a sealing shell two, a piston two, a push rod and a push block; the sealing shell one is arranged in the suction head body, the piston one is slidingly arranged in the sealing shell one, one end of the connecting rod is connected with the piston one, and the other end of the connecting rod is connected with the shape conversion device; the sealing shell two is mounted on the outer side wall of the suction head body, the piston two is slidingly arranged in the sealing shell two, one end of the push rod is connected with the piston two, and the other end of the push rod is connected with the push block; and the sealing shell one and the sealing shell two are connected through the connecting pipe.

[0012] Further, the inner side wall of the arc-shaped sliding plate is slidingly connected with the outer side wall of the suction head body and the suction head, and the driving device comprises a connecting rod and a sliding block; one end of the connecting rod is fixedly connected with the end of the arc-shaped sliding plate, the other end of the connecting rod is fixedly connected with the sliding block, and the sliding block is slidingly connected with the outer side wall of the suction head body.

[0013] Further, the suction head body is composed of two sections of pipelines connected by rotation, and the two sections of suction head bodies keep long through; the sealing shell one and the sealing shell two are respectively installed on the two sections of suction head bodies, and the connecting pipe passes through the rotation shaft of the two sections of suction head bodies to realize the connection of the sealing shell one and the sealing shell two.

[0014] Further, the two sections of suction head bodies are connected by the rotation shaft, and the rotation shaft is hollow to keep long through of the two sections of suction head bodies.

[0015] Further, the suction head body of the proximal end is provided with an arc-shaped blocking plate, the suction head body of the proximal end is provided with a bypass pipe on the side wall close to the suction head body of the distal end, and the bypass pipe is provided with a sealing unit one; the side wall of the suction head body of the distal end is provided with a sealing unit two, when the two sections of suction head bodies form a 90-degree angle, the sealing unit one and the sealing unit two can be mutually opened to make the suction head body of the distal end communicate with the bypass pipe.

[0016] Further, the sealing unit one comprises a sealing plate and a reset spring; one end of the reset spring is fixedly connected with the side wall of the opening of the suction head body, and the other end of the reset spring is connected with the sealing plate; under the normal state, the sealing plate is combined with the inner side wall of the suction head body under the action of the pulling force of the reset spring.

[0017] The sealing unit two comprises a threaded rod and a sealing ring, the sealing ring is fixedly installed at the end of the bypass pipe, the threaded rod is composed of two sections of threads with different diameters, the section of thread with large diameter is connected with the sealing ring, and the section of thread with small diameter is connected with the side wall of the bypass pipe.

[0018] When the side wall opening of the suction head body is connected with the bypass pipe, the sealing plate can be opened by rotating the threaded rod.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1、The suction head is arranged as a flexible flat head or a flexible lower arc structure, and the shape and size of the suction head are adjusted by arranging a shape conversion device, so that the adaptability to narrow surgical fields can be realized, and the suction head can be timely dredged by the deformation effect; in addition, the smoke generated by the electric knife can be timely discharged by the deformation effect of the suction head, and the operation efficiency is improved.

[0021] 2、The suction head is arranged as a flexible flat head, and a supporting ring is arranged in the suction head body, the supporting ring is connected with a driving device, and the supporting ring moves along the length direction of the suction head and the suction head body by the driving device, so that the flat suction head can be applied to the narrow surgical field under the normal state. When the suction head is blocked or needs to suck the smoke generated by the electric knife, the suction head can be supported and opened by the supporting ring, so that the blockage or a large amount of smoke can be sucked into the suction head body.

[0022] 3、The suction head is set to be flexible and flat, and the inner side wall of the suction head and the front end of the driving device are rotationally connected through two support rods. The support rods are used to support the suction head by the driving device, so that the blockage or a large amount of smoke is sucked into the suction head body;

[0023] 4、The suction head body is set to be rotationally connected to two sections, and the two sections of the suction head are kept in a long through state. In this way, the operator can adjust the angle of the suction head body at the distal end to avoid blocking the surgical field and facilitate observation by others. In addition, the connecting pipe in the driving device passes through the rotation shaft positions of the two suction head bodies. In this way, the operator can still adjust the shape of the suction head by holding the suction head body at the rear end and pushing the push block;

[0024] 5、The side walls of the two sections of the suction head body are rotationally connected, and the rotation shaft positions are hollow. In this way, the suction head body at the front end can be adjusted within an angle range of 0-90°, and no matter how the angles of the two suction head bodies are adjusted, the two suction head bodies can keep the same opening degree of communication;

[0025] 6、A bypass pipe is arranged on the suction head body at the rear end, and a sealing unit two is arranged in the bypass pipe. Meanwhile, a sealing unit one corresponding to the sealing unit two is arranged on the suction head body at the front end. When the two sections of the suction head body are adjusted to a 90° included angle, the two sections of the suction head body are communicated through the bypass pipe under the action of the sealing unit two. Similarly, the suction head body can be adjusted within an angle range of 0-90°, which avoids blocking the surgical field and facilitates observation by others. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a side sectional view of a variable cross-section suction head provided by embodiment 1 of the present application;

[0027] Figure 2 is a front view of the suction head provided by embodiment 1 of the present application;

[0028] Figure 3 is a side sectional view of a variable cross-section suction head provided by embodiment 2 of the present application when the suction head is not supported;

[0029] Figure 4 is a side sectional view of a variable cross-section suction head provided by embodiment 2 of the present application when the suction head is supported;

[0030] Figure 5 is a side sectional view of a variable cross-section suction head provided by embodiment 3 of the present application when the suction head is not supported;

[0031] Figure 6 is Figure 5 is an enlarged view of position A in FIG. 7;

[0032] Figure 7 is a front view of the suction head according to embodiment 3 of the present invention;

[0033] Figure 8 is a side sectional view of the suction head of the variable cross-section suction head according to embodiment 3 of the present invention when the suction head is stretched;

[0034] Figure 9 is a side sectional view of the variable cross-section suction head according to embodiment 4 of the present invention when the front end of the suction head is circular in cross-section;

[0035] Figure 10 is a side sectional view of the variable cross-section suction head according to embodiment 4 of the present invention when the front end of the suction head is lower arc-shaped in cross-section;

[0036] Figure 11 is a front view of the suction head position according to embodiment 4 of the present invention;

[0037] Figure 12 is a side sectional view of the variable cross-section suction head according to embodiment 5 of the present invention when the front end of the suction head is circular in cross-section;

[0038] Figure 13 is a side sectional view of the variable cross-section suction head according to embodiment 5 of the present invention when the front end of the suction head is lower arc-shaped in cross-section;

[0039] Figure 14 is a front view of the suction head position according to embodiment 5 of the present invention;

[0040] Figure 15 is a side sectional view of the variable cross-section suction head according to embodiment 6 of the present invention;

[0041] Figure 16 is a side sectional view of the variable cross-section suction head according to embodiment 6 of the present invention when the front end of the suction head body is rotated;

[0042] Figure 17 is a plan sectional view of the variable cross-section suction head according to embodiment 6 of the present invention;

[0043] Figure 18 is a side sectional view of the variable cross-section suction head according to embodiment 7 of the present invention;

[0044] Figure 19 is a plan sectional view of the variable cross-section suction head according to embodiment 7 of the present invention;

[0045] Figure 20 is a side sectional view of the variable cross-section suction head according to embodiment 8 of the present invention;

[0046] Figure 21 is Figure 20 is an enlarged view of A in FIG. 11;

[0047] Figure 22 is a side sectional view of a variable cross-section suction head in the embodiment 8 of the present application when the two suction head bodies are at a 90° angle;

[0048] Figure 23 is Figure 22 is an enlarged view of A in

[0049] Reference signs involved in the above-mentioned drawings:

[0050] 1, suction head; 2, suction head body; 3, slider; 4, arc-shaped plate; 5, support ring; 6, connecting rod; 7, sealing shell one; 8, piston one; 9, sealing shell two; 10, push block; 11, push rod; 12, piston two; 13, connecting pipe; 14, support rod; 15, arc-shaped slide plate; 16, driving block; 17, sealing plate; 18, return spring; 19, bypass pipe; 20, threaded rod; 21, sealing ring; 22, positioning block. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0052] The implementation of the present application is described in detail below in combination with specific embodiments.

[0053] In the drawings of the present embodiment, the same or similar reference signs correspond to the same or similar parts; in the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0054] Referring to Figures 1-23 , a preferred embodiment provided by the present application is shown.

[0055] Embodiment 1: a variable cross-section suction head, as shown in Figure 1 and Figure 2 , comprising a suction head body 2, a suction head 1 made of silica gel is installed at the distal end of the suction head body 2, and the suction head 1 is a flat head as shown, the length of the flat part is about 5 cm; an adjusting mechanism is installed on the suction head body 2, which can spread the suction head 1.

[0056] The adjusting mechanism is mainly composed of a shape conversion device and a driving device. In the embodiment, the shape conversion device is a support ring 5, and the outer side wall of the support ring 5 is in sliding connection with the inner side wall of the suction head body 2. In order to avoid damage to the suction head 1 when the support ring 5 is used to expand the suction head 1, the distal end of the support ring 5 is provided with a rounded corner.

[0057] The driving device of the embodiment is mainly composed of an arc-shaped plate 4 and a sliding block 3. The distal end of the arc-shaped plate 4 is fixedly connected with the proximal end of the support ring 5. A strip-shaped through slot (not labeled in the figure) is formed in the side wall of the suction head body 2, which facilitates the sliding of the sliding block 3 along the strip-shaped through slot. The bottom surface of the sliding block 3 is fixedly connected with the side surface of the arc-shaped plate 4. The main function of the arc-shaped plate 4 is to ensure the internal sealing of the suction head body 2. When the sliding block 3 moves, the arc-shaped plate 4 also slides synchronously, but the arc-shaped plate 4 always blocks the strip-shaped through slot, so as to avoid the flow of blood, smoke and other fluids from the strip-shaped through slot.

[0058] The proximal end of the suction head body 2 of the embodiment can be connected with an existing suction device, which will not be described in detail here.

[0059] Working principle: the surgeon uses the 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 needs to suck away the smoke generated by the electric knife burning, the surgeon only needs to hold the suction head body 2 and push the sliding block 3 with the fingers. At this time, the support ring 5 enters the suction head 1 under the action of the arc-shaped plate 4, so as to expand the suction head 1. At this time, the problem of blockage of the suction head 1 is solved, and the smoke can smoothly enter the suction head body 2.

[0060] Embodiment 2: a suction head with variable cross section, as shown in Figure 3 and Figure 4 The main difference between the embodiment and embodiment 1 is the structure of the driving device. The embodiment uses a hydraulic method to drive the support ring 5 to move. Specifically, the driving device is mainly composed of a sealed shell one 7, a piston one 8, a connecting rod 6, a connecting pipe 13, a sealed shell two 9, a piston two 12, a push rod 11 and a push block 10. The shape of the sealed shell one 7 is the same as that of the support ring 5, and the cross section of both is annular. The piston one 8 is also an annular piston. The piston one 8 is slidingly arranged in the sealed shell one 7. The side of the piston one 8 close to the support ring 5 is connected with the support ring 5 through the connecting rod 6. The sealed shell two 9 is fixedly installed on the outer side wall of the suction head body 2. The piston two 12 is slidingly arranged in the sealed shell two 9. The side of the piston two 12 away from the support ring 5 is connected with the push block 10 through the push rod 11. The push block 10 is in sliding connection with the outer side wall of the suction head body 2. The sealed shell one 7 and the sealed shell two 9 are connected through the connecting pipe 13. A sealed space is formed among the piston one 8, the sealed shell one 7, the connecting pipe 13, the sealed shell two 9 and the piston two 12, which is filled with liquid. In this way, by pushing the push block 10, the support ring 5 can be made to slide towards the distal end and expand the suction head 1 by using the hydraulic action.

[0061] 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.

[0062] Example 3: A variable cross-section suction head, such as Figures 5-8 As shown, the difference between this embodiment and embodiment 2 is mainly in the structure of the form conversion device. Figure 5 and Figure 6 As 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.

[0063] 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 ).

[0064] 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.

[0065] 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).

[0066] 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, Figure 10 As shown, the arc-shaped slide plate 15 is slidably sleeved on the outer side wall of the suction head body 2.

[0067] Example 5: A variable cross-section suction head, such as Figures 12-14As shown, the suction head 1 of the present embodiment is the same as that of Embodiment 4, the main difference is that the arc-shaped slide 15 has a different cross-sectional arc diameter and the driving device has a different structure. As shown in Figure 14 As shown, the arc-shaped slide 15 of the present embodiment has a cross-sectional arc diameter smaller than the inner diameter of the suction head body 2 and the inner diameter of the suction head body 2, and the outer side wall of the arc-shaped slide 15 is in sliding contact with the inner side wall of the suction head body 2. Since the arc-shaped slide 15 is located inside the suction head body 2 when it moves towards the proximal end, the driving device of the present embodiment has the same structure as that of Embodiments 2 and 3, and will not be described in detail here.

[0068] Embodiment 6: A suction head with a variable cross-section. In order to facilitate observation by others during surgery, the present embodiment provides a structure that allows the suction head to bend, as shown in Figures 15-17 As shown, the suction head body 2 of the present embodiment is provided in two sections, and the connecting portion between the two sections is a spherical shell with different diameters. The distal suction head uses the center of the spherical shell as the axis, and one side of the spherical shell is open. When the distal suction head body 2 is rotated, the two suction head bodies 2 are always in communication. The suction head 1 of the present embodiment can be any of the suction heads 1 of Embodiments 2-4, and the shape conversion device is the same as that of Embodiments 2-4.

[0069] The driving device structure is the same as that of Embodiment 2, but the installation position is different. The sealing housing one 7 and the piston one 8 in the driving device are located in the distal suction head body 2. The sealing housing two 9, the piston two 12, the push rod 11 and the push block 10 are located on the outer side wall of the proximal suction head body 2. The connecting pipe 13 is composed of two sections, one section is located in the distal suction head body 2 and communicates with the sealing housing one 7, and the other section is located outside the suction head body 2 and communicates with the sealing housing two 9. The connecting portion of the two sections of the connecting pipe 13 is located at the rotation shaft of the suction head body 2. Specifically, one connecting pipe 13 is inserted into the other connecting pipe 13 and connected by rotating. The two connecting pipes 13 are fixedly connected with the two suction head bodies 2 respectively, so that when the suction head body 2 rotates, the two connecting pipes 13 can maintain a long communication, and also limit the rotation of the distal suction head body 2 towards a plane direction.

[0070] In use, the operator holds the proximal suction head body 2 and adjusts the shape of the suction head 1 by pushing the push block 10.

[0071] Example 7: A variable cross-section suction head, due to the need to consider the communication state of the spherical shell of the distal suction head body 2 in Example 6, the rotation angle of the distal suction head body 2 is limited and cannot achieve 90° bending. Therefore, in this embodiment, the side walls of the two suction head bodies 2 are connected by a rotating shaft, which is a hollow rotating 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 in communication. The two suction head bodies 2 connected in this way have three advantages:

[0072] 1. The suction head can be adjusted to 90° bending, expanding the rotation angle range;

[0073] 2. The opening degree of the communication is constant and will not affect the negative pressure;

[0074] 3. The connecting pipe 13 can pass through any position on the side wall of the distal suction head body 2, and the connecting pipe 13 limited to a hose will not affect the rotation of the distal suction head body 2.

[0075] The installation positions of the components of the driving device of this embodiment are the same as those of Example 6, which will not be described in detail here.

[0076] Example 8: A variable cross-section suction head, this embodiment provides another scheme for keeping the two suction head bodies 2 in communication when bending 90°. As Figures 20-23 , in this embodiment, a hole is opened on the side wall of the distal suction head body 2, and a bypass pipe 19 is opened on the side wall of the proximal suction head body 2, and the opening direction of the bypass pipe 19 is the same as that of the proximal suction head body 2. When the distal suction head body 2 is rotated to 90° bending, the opening on the distal suction head body 2 is connected with the opening of the bypass pipe 19, the specific way can be seen from Figure 23 .

[0077] A sealing unit one and a sealing unit two are respectively installed in the opening and the bypass pipe 19, the structure of the sealing unit one is shown in Figure 21 , mainly composed of a sealing plate 17 and a return spring 18, one end of the return spring 18 is fixedly connected with the side wall of the opening, and the other end is fixedly connected with 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.

[0078] The sealing unit two is mainly composed of a threaded rod 20 and a sealing ring 21; the sealing ring 21 is fixedly installed on the inner side wall of the bypass pipe 19, as Figure 23As shown, the threaded rod 20 is composed of two threaded segments with different radii, the diameter of the segment close to the sealing ring 21 is large, and the diameter of the segment far from the sealing ring 21 is small. The segment with large diameter of the threaded rod 20 is screwed with the side wall of the bypass pipe 19. Meanwhile, a positioning block 22 is arranged on the side wall of the suction head body 2, and the positioning block 22 is sleeved on the segment with small diameter of the threaded rod 20. The through hole of the sealing ring 21 matches the segment with large diameter of the threaded rod 20, and in the initial state (as shown in Figure 21 ), the front end of the threaded rod 20 blocks the sealing ring 21, so as to avoid the fluid flowing out of the bypass pipe 19.

[0079] The structure of the suction head 1, the structure of the hydraulic driving device and the structure of the shape conversion device in the above embodiment can be used in the present embodiment, and thus no more detailed description is given herein.

[0080] Working principle: when the suction head is not bent or is adjusted at a small angle, the two suction head bodies 2 are connected in series, the sealing plate 17 blocks the opening at this time, and the segment with large diameter of the threaded rod 20 blocks the sealing ring 21. When the suction head is bent at 90°, as shown in Figure 22 , 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 with the bypass pipe 19, and the operator only needs to rotate the threaded rod 20, so that the threaded rod 20 moves towards the opening and pushes open the sealing plate 17, and at the same time, the segment with large diameter of the threaded rod 20 is separated from the sealing ring 21, so that the fluid can enter the proximal suction head body 2 through the opening and the bypass pipe 19.

[0081] It should be noted that no matter what kind of adjusting mechanism is used in the present application, as long as the suction head 1 can be deformed, whether it can be bent or not, the overall structure of the suction head is within the scope of protection of the present application.

[0082] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

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 includes a form conversion device and a driving device, 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; 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); 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); 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); The distal suction head body (2) is provided with an arc-shaped blocking plate near the proximal suction head body (2), and the proximal suction head body (2) is provided with a bypass pipe (19) on the side wall near the distal suction head body (2), and a sealing unit 2 is provided in the bypass pipe (19); the distal suction head body (2) is provided with a sealing unit 1 on the side wall near the proximal suction head body (2), 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).

2. 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 includes a form conversion device and a driving device, 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; The suction head (1) is a flexible flat head in a natural state, and the shape conversion device includes 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); 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); 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); The distal suction head body (2) is provided with an arc-shaped blocking plate near the proximal suction head body (2), and the proximal suction head body (2) is provided with a bypass pipe (19) on the side wall near the distal suction head body (2), and a sealing unit 2 is provided in the bypass pipe (19); the distal suction head body (2) is provided with a sealing unit 1 on the side wall near the proximal suction head body (2), 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).

3. 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 includes a form conversion device and a driving device, 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; The suction head (1) 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 (15) that slides along the length direction of the suction head body (2) and the suction head (1); 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); 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); The distal suction head body (2) is provided with an arc-shaped blocking plate near the proximal suction head body (2), and the proximal suction head body (2) is provided with a bypass pipe (19) on the side wall near the distal suction head body (2), and a sealing unit 2 is provided in the bypass pipe (19); the distal suction head body (2) is provided with a sealing unit 1 on the side wall near the proximal suction head body (2), 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).

4. A variable cross-section suction head according to any one of claims 1 to 3, 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 opening side wall 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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