Anti-blocking drainage device for thoracic surgery

Abstract

The application discloses a chest surgery anti-blocking drainage device, and relates to the related technical field of medical devices, which comprises a drainage tube, the drainage tube comprises an in-vivo section and an in-vitro section, the in-vivo section and the in-vitro section are connected through a communicating device, and the drainage tube is fixed by a fixing unit; the fixing unit comprises a connecting plate and a bandage arranged on the connecting plate, the communicating device is provided with a connecting hole, the connecting plate is provided with a connecting plug, and the connecting plug is inserted into the connecting hole after the in-vivo section is inserted into a patient's body; the connecting plug is inserted into the connecting hole, and the bandage is bound on the patient's body, so that the in-vivo section of the drainage tube is fixed, the fixing mode can better guarantee the use stability of the in-vivo section compared with the use of adhesive tape or a structure with adsorption function, and thus the drainage operation of the chest surgery is smoothly performed.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a drainage device for thoracic surgery that prevents blockage. Background Technology

[0002] As is generally known, a thoracotomy drainage device is a medical device used to drain air, blood, or fluid from the pleural cavity, restore negative pressure in the pleural cavity, and promote lung re-expansion. It is widely used for drainage after hemothorax, pneumothorax, empyema, and thoracotomy.

[0003] One end of the drainage tube of the drainage device is inserted into the patient's chest cavity, and the other end is connected to the drainage bottle. In order to avoid the drainage tube from being blocked due to blood clots or damaged tissue in the patient's chest cavity, an anti-blocking mechanism is set on the drainage device to clear the drainage tube. In existing technologies, drainage tubes placed on a patient's body can be pulled when the drainage device needs to move with the patient. Currently, the portion of the drainage tube in contact with the patient's skin is fixed to the skin with sutures and then secured with medical tape; alternatively, a structure with adsorption properties is used to fix the drainage tube to the patient's skin. For example, patent CN120114734A, published on June 10, 2025, entitled "A Drainage Tube Fixing Device," includes a fixing body, a clamping part and an adsorption part disposed on the fixing body. The fixing body has a cavity in the middle, and a through hole for the drainage tube to pass through is opened on the bottom wall of the cavity. The clamping part is disposed on the fixing body and located on the outside of the bottom wall of the cavity. The clamping part can be driven to rotate to adjust the diameter of the through hole. The fixing body has a locking part for restricting the rotation of the clamping part. An adsorption part is disposed on the other side of the fixing body opposite to the clamping part, and the adsorption part includes a negative pressure adsorption component for fixing the fixing body. The present invention provides a drainage tube fixing device, wherein the clamping part can rotate to adjust the through hole size to accommodate drainage tubes of different diameters, ensuring that the drainage tube is firmly clamped, and the adsorption part allows the fixing body to be firmly adsorbed on the skin, thereby providing stable support for the drainage tube and enhancing the overall fixation reliability.

[0004] The shortcomings of existing technologies are that when using adhesive tape to fix drainage tubes connected to the patient's skin, the adhesiveness decreases as the patient uses it for longer periods, sweats, or moves. Using structures with adsorption functions can cause the tubes to adhere to the patient's skin, leading to redness, swelling, or even bleeding with prolonged use. This obviously has an adverse effect on drainage procedures in thoracic surgery. Summary of the Invention

[0005] The purpose of this invention is to provide a drainage device for thoracic surgery that prevents clogging, thereby solving the technical problems in related technologies. To achieve the above objective, this invention provides the following technical solution:

[0006] A drainage device for thoracic surgery to prevent blockage includes a drainage tube comprising an internal segment and an external segment connected by a communicating vessel. It also includes a fixing unit for securing the drainage tube. The fixing unit includes a connecting plate and a strap on the connecting plate. The communicating vessel has a connecting hole, and a connecting plug is mounted on the connecting plate. After the internal segment is inserted into the patient's body, the connecting plug is plugged into the connecting hole.

[0007] As described above, an airbag cushion is installed on the side of the connecting plate facing the patient's skin.

[0008] As described above, the inner segment is provided with an expansion mechanism, which adjusts the radial dimension of the inner segment based on the expansion and contraction of the airbag.

[0009] The aforementioned expansion mechanism includes an expansion bracket arranged inside the body section and a roller arranged on the communicating vessel. A guide wire is wound on the roller, and the rotation of the roller drives the expansion bracket to change its radial dimension through the guide wire. The communicating vessel is also provided with a piston chamber, which is connected to an air bladder through an air pipe. A piston block is slidably arranged in the piston chamber. Based on the expansion and contraction of the air bladder, the piston block drives the roller to rotate in both directions.

[0010] As described above, the expansion bracket is composed of several interlaced support bars with a columnar spiral structure, and the support bars are elastic. Based on the rotation of the roller, the guide wire applies an axial force to the expansion bracket to achieve changes in radial dimensions.

[0011] As described above, the surface of the support bar consists of a first surface that abuts against the inner surface of the body segment and a second surface that abuts against the inner surface of the body segment. During the axial movement of the support bar, the junction of the first and second surfaces scrapes against the inner surface of the body segment.

[0012] As mentioned above, the conductive wire and the expansion bracket are connected by a hinge, and the swing angle between them is greater than 180 degrees.

[0013] As described above, a guide ball is rotatably provided at the part of the communicating vessel through which the conductive wire passes, and an elastic element is provided between the guide ball and the communicating vessel.

[0014] The aforementioned roller includes a main body connected to the guide wire and two auxiliary bodies slidably arranged at both ends of the main body along its axial direction. Each auxiliary body is equipped with a knob. The auxiliary body has three positions on the main body: in the first position, the auxiliary body rotates under the drive of the piston block; in the second position, rotating the knob drives the auxiliary body to rotate, and the main body drives the guide wire to move; in the third position, the auxiliary body drives the guide ball to deflect.

[0015] As described above, a limiting mechanism is provided between the two knobs, and each knob and its corresponding sub-body have two states: in the first state, the knob is not connected to the corresponding sub-body, and the sub-body rotates under the drive of the piston block; in the second state, the knob is connected to the corresponding sub-body, and when the two knobs do not simultaneously drive the corresponding sub-body to the first position, the limiting mechanism restricts the rotation of the two knobs.

[0016] The beneficial effects of this invention are as follows: by inserting the connector plug into the connector hole and binding the strap to the patient's body, the internal segment of the drainage tube is fixed. Compared with using adhesive tape or structures with adsorption function, this fixing method can better ensure the stability of the internal segment and make the drainage operation in thoracic surgery proceed smoothly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a first-view three-dimensional structural diagram of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention;

[0019] Figure 2 This is a second-view three-dimensional structural diagram of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of the expansion stent of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention when it is located in the body segment;

[0022] Figure 5 This is a schematic cross-sectional view of the expansion stent of a thoracic surgical anti-blockage drainage device when it enters the external segment, as provided in an embodiment of the present invention.

[0023] Figure 6 This is a schematic cross-sectional view of the insertion block and insertion slot of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention when they are not inserted.

[0024] Figure 7 This is a cross-sectional structural diagram showing the process by which two knobs of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention synchronously drive two corresponding auxiliary bodies to move from a first position to a second position.

[0025] Figure 8 This is a cross-sectional structural diagram showing the process in which the two knobs of a thoracic surgical anti-blockage drainage device provided in an embodiment of the present invention do not synchronously drive the corresponding two auxiliary bodies to move from the first position to the second position.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Drainage tube; 10. Intracorporeal section; 11. Extracorporeal section; 12. Communicating vessel; 2. Fixing unit; 20. Connecting plate; 21. Strap; 24. Airbag cushion; 30. Expansion bracket; 31. Roller; 310. Main body; 311. Sub-body; 312. Knob; 32. Conducting wire; 33. Piston chamber; 330. Protrusion; 34. Piston block; 340. Recess; 35. Trachea; 36. Guide ball; 37. First rack; 38. Second rack; 39. Third rack; 40. Insertion groove; 41. Insertion block; 42. Limiting groove; 43. Limiting block; 44. Push rod. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1 To be continued Figure 8 The present invention will now be described in further detail.

[0029] In this embodiment of the invention, a drainage device for thoracic surgery to prevent blockage is provided, including a drainage tube 1, which includes an internal segment 10 and an external segment 11, which are connected by a communicating vessel 12. The device also includes a fixing unit 2 for fixing the drainage tube 1. The fixing unit 2 includes a connecting plate 20 and a strap 21 on the connecting plate 20. The communicating vessel 12 has a connecting hole, and the connecting plate 20 is equipped with a connecting plug. After the internal segment 10 is inserted into the patient's body, the connecting plug is inserted into the connecting hole.

[0030] Specifically, the internal segment 10 of the drainage tube 1 has multiple drainage holes on its surface, and its radial dimension is smaller than that of the external segment 11. The internal segment 10 is soft and pressure-resistant. The communicating vessel 12 connects the internal segment 10 and the external segment 11. The external segment 11 is equipped with a flow-stopping clip and is connected to the drainage bottle. During use, a negative pressure is generated by a negative pressure suction device to draw gas or fluid from the pleural cavity through the drainage tube 1 into the drainage bottle. The negative pressure can accelerate the drainage process and help the lung re-expand. In the existing technology, the internal segment 10 is usually fixed by sutures to the patient's skin after the internal segment 10 is inserted into the patient's pleural cavity, and then fixed again with medical tape. The adhesive tape fixation will decrease due to the increased use time, sweating, or activity of the patient. Alternatively, a structure with adsorption function can be used for fixation, which will have an adsorption effect on the patient's skin. Long-term use will cause skin redness and swelling or even bleeding, which obviously has an adverse effect on the drainage operation of thoracic surgery.

[0031] Based on the above problems, in this embodiment, the internal segment 10 is fixed to the strap 21 by connecting the connecting plate 20 and the communicating vessel 12. The strap 21 is composed of two parts connected by the connecting plate 20, and the two parts are connected by a snap-fit ​​buckle and can be adjusted in length. This is prior art and will not be described in detail. The figure shows the specific structure of the snap-fit ​​buckle. The connecting plug on the connecting plate 20 is T-shaped and can rotate on the connecting plate 20. The connecting hole on the communicating vessel 12 is adapted to the T-shaped connecting plug. After the connecting plug is inserted into the connecting hole, rotating the connecting plug will prevent the connecting plug from being pulled out of the connecting hole. This achieves the connection between the connecting plate 20 and the communicating vessel 12. When the strap 21 is worn on the patient's body, when the external segment 11 is pulled, the strap 21 is preferably subjected to force, rather than the part of the internal segment 10 that is in contact with the skin. This better protects the connection between the internal segment 10 and the patient.

[0032] The beneficial effect of this embodiment is that by inserting the connector into the connector hole and binding the strap 21 to the patient's body, the internal segment 10 of the drainage tube 1 is fixed. Compared with using adhesive tape or a structure with adsorption function, this fixing method can better ensure the stability of the internal segment 10 and make the drainage operation of thoracic surgery proceed smoothly.

[0033] Preferably, an airbag cushion 24 is installed on the side of the connecting plate 20 facing the patient's skin; specifically, the airbag cushion 24 can increase the flexibility between the strap 21 and the patient's body, and the airbag cushion 24 can be filled with an appropriate amount of gas according to actual needs, making the strap 21 more comfortable to wear.

[0034] Furthermore, the inner segment 10 is provided with a radial dimension that can be adjusted based on the expansion and contraction of the airbag cushion 24.

[0035] Specifically, when the inner segment 10 is working, the drainage holes arranged on it and the radial dimension of the inner segment 10 are basically changed. When there is viscous drainage fluid, it may block the holes on the inner segment 10. Therefore, it is necessary to clean the blockage of the inner segment 10. In this embodiment, it is set inside the inner segment 10, that is, by expanding outward, the radial dimension of the inner segment 10 is increased. Then the drainage holes on the inner segment 10 will also be expanded and enlarged, so the drainage fluid can enter the inner segment 10 more easily. The power comes from the expansion and contraction of the airbag cushion 24.

[0036] Therefore, in an optional embodiment, the expansion bracket 30 arranged inside the body section 10 and the roller 31 arranged on the communicating vessel 12 are included. The roller 31 is wound with a guide wire 32. The rotation of the roller 31 drives the expansion bracket 30 to change its radial dimension through the guide wire 32. The communicating vessel 12 is also provided with a piston chamber 33. The piston chamber 33 is connected to the airbag cushion 24 through an air pipe 35. A piston block 34 is slidably arranged in the piston chamber 33. Based on the expansion and contraction of the airbag cushion 24, the piston block 34 drives the roller 31 to rotate in both directions.

[0037] Specifically, the expansion stent 30 has an internally hollow cylindrical structure and is attached to the inner wall of the internal segment 10. The expansion stent 30 is composed of several columnar spiral bars arranged in an interlaced manner, that is, the bars are divided into two types with different spiral directions, such as clockwise spiral and counterclockwise spiral, and are then arranged in an interlaced manner in the circumferential direction. Each bar is elastic (such as being made of some shape memory metal materials). Based on the rotation of the roller 31, the conductive wire 32 applies an axial force to the expansion stent 30 to achieve a change in radial dimension. That is, when the expansion stent 30 is axially compressed, the axial length of the expansion stent 30 contracts, while the radial dimension increases. Therefore, the interlaced arrangement of several bars forms several parallelogram-like structures. When these structures are compressed axially, the length in the other direction perpendicular to the axial direction increases, thus achieving an increase in radial dimension and expanding the radial dimension of the internal segment 10. When the strap 21 is worn, the patient's breathing will cause chest cavity... When the airbag 24 expands or contracts, it exerts a compressive force on the airbag cushion 24, causing it to expand and contract dynamically. Utilizing this dynamic change, a piston chamber 33 is provided on the communicating vessel 12, and a piston block 34 is slidably disposed within the piston chamber 33. The piston block 34 is connected to the inner wall of the piston chamber 33 using a dynamic seal. The airbag cushion 24 and the piston chamber 33 are connected by an air pipe 35. When the airbag cushion 24 expands or contracts, it drives the gas flow within the piston chamber 33, thereby moving the piston block 34. A first rack 37 is arranged on the piston block 34, and a second rack 38 is arranged on the roller 31. The first rack 37 and the second rack 38 mesh. Thus, the expansion and contraction of the airbag cushion 24 causes the piston block 34 to move back and forth, thereby causing the roller 31 to rotate in both directions. The rotation of the roller 31 winds and releases the transmission wire 32. The transmission wire 32 has a certain degree of toughness and can transmit power axially, thereby driving the expansion and contraction changes in the axial direction.

[0038] Preferably, the surface of the support bar consists of a first surface that abuts against the inner surface of the body segment 10 and a second surface that separates from the surface of the body segment 10. During the axial movement of the support bar, the junction of the first surface and the second surface forms a scraping action on the inner surface of the body segment 10.

[0039] Specifically, due to the staggered arrangement of several supports, during the axial compression process, the structure resembles a parallelogram. When the included angle changes, it can shear the viscous drainage fluid that is blocked in the drainage hole of the internal segment 10, and can also scrape the inner wall of the internal segment 10. Furthermore, during the wearing of the strap 21, the radial dimension of the expansion bracket 30 is constantly changing, which can better prevent the internal segment 10 of the drainage tube 1 from becoming blocked.

[0040] Preferably, the conductive wire 32 and the expansion bracket 30 are connected by a hinge, and the swing angle between them is greater than 180 degrees. Specifically, since the conductive wire 32 has a certain toughness, it will undergo some shape changes during the movement of the body segment 10. In order to enable it to transmit power along the axial direction and prevent large bending angles at the connection between it and the expansion bracket 30, in this embodiment, the end of the conductive wire 32 connected to the expansion bracket 30 is connected by a hinge, and some positional adaptation changes are made so that the swing angle between the conductive wire 32 and the expansion bracket can be greater than 180 degrees.

[0041] Preferably, a guide ball 36 is rotatably provided on the part of the communicating vessel 12 through which the conductive wire 32 passes, and an elastic element is provided between the guide ball 36 and the communicating vessel 12. Specifically, as can be seen from the foregoing embodiment, the conductive wire 32 needs to pass through the wall of the communicating vessel 12 from the roller 31, enter its interior, and extend to the body section 10 to connect with the expansion bracket 30. During the movement of the conductive wire 32 in the body section 10, some shape changes will occur. Therefore, the part of the conductive wire 32 that contacts the communicating vessel 12 may have creases due to its excessive bending angle. This will have an adverse effect on the movement of the conductive wire 32, that is, the creases will affect the guidance of the conductive wire 32, and there will be a jamming problem when passing through the wall of the communicating vessel 12.

[0042] Therefore, in this embodiment, a guide ball 36 is rotatably provided on the part of the communicating vessel 12 through which the conductive wire 32 passes, and the conductive wire 32 passes through the guide ball 36 in a certain radial direction. The guide ball 36 and the communicating vessel 12 are also sealed by a dynamic seal, and the conductive wire 32 and the guide ball 36 are also sealed by a dynamic seal. Then, by utilizing the elastic force of the elastic element, the position of the guide ball 36 tends to remain at a certain position. That is, if the conductive wire 32 needs to drive the expansion bracket 30 to axially expand and contract, the orifice of the guide ball 36 for the conductive wire 32 to move can be oriented towards the body section 10, thereby basically avoiding the above-mentioned problems.

[0043] Furthermore, the roller 31 includes a main body 310 connected to the guide wire 32 and two auxiliary bodies 311 slidably arranged at both ends of the main body 310. Each auxiliary body 311 is equipped with a knob 312. The auxiliary body 311 has three positions on the main body 310: in the first position, the auxiliary body 311 rotates under the drive of the piston block 34; in the second position, rotating the knob 312 drives the auxiliary body 311 to rotate, and the main body 310 drives the guide wire 32 to move; in the third position, the auxiliary body 311 drives the guide ball 36 to deflect.

[0044] Specifically, the dilatation stent 30 can be moved axially and expanded radially within the in vivo segment 10. However, when viscous drainage fluid adheres to the dilatation stent 30, as it accumulates, it will also affect the drainage effect. Therefore, in this embodiment, the dilatation stent 30 can not only move within the in vivo segment 10, but also move outside the external segment 11. It can also be used with a cleaning solution (such as saline) to clean the drainage fluid adhering to the drainage tube 1 and the drainage fluid adhering to the dilatation stent 30. This has a beneficial effect on the drainage operation and the drainage effect.

[0045] The second rack 38 is a ring structure arranged on the auxiliary body 311. During normal drainage operations, only the expansion and contraction of the airbag 24 is needed to drive the expansion stent 30 to move radially and axially within the internal segment 10. Therefore, the auxiliary body 311 should be in the first position at this time, that is, the first rack 37 on the piston block 34 and the second rack 38 on the auxiliary body 311 are in a meshing state (the two second racks 38 on the two auxiliary bodies 311 are meshed with the two first racks 37 on the piston block 34 respectively). When the expansion stent 30 needs to be moved from the internal segment 10 to the external segment 11, it indicates that the expansion stent 30 and the drainage tube 1 need to be cleaned, which requires medical attention. If medical personnel are to perform manual operation, they should first push the piston block 34 into the piston cavity 33 and fix its position, because the medical personnel need to contact the communicating vessel 12 at this time. Ensuring the strap 21 is securely fixed can reduce pulling on the internal segment 10. Thus, a protrusion 330 is provided in the piston cavity 33, and a recess 340 is provided on the piston block 34. First, rotate the knob 312 to rotate the two auxiliary bodies 311, which will cause the main body 310 to rotate accordingly. Using the cooperation of the second rack 38 and the first rack 37, the piston block 34 is pushed away from the auxiliary bodies 311 until the protrusion 330 and the recess 340 are engaged. The position of the recess 340 is such that the piston block 34... 4. Based on the compression action of the protrusion 330, elastic deformation can occur. When the protrusion 330 and the recess 340 are inserted, the expansion and contraction of the airbag cushion 24 causes the piston block 34 to remain essentially stationary within the piston cavity 33. Subsequently, by using the two knobs 312 to push the two sub-bodies 311 closer together axially, the first position moves to the second position. At this point, the second rack 38 disengages from the first rack 37, and then the guide wire 32 begins to wind up until it reaches the guide ball 36 position at the hinge point between the guide wire 32 and the expansion bracket 30. Then, by using the two knobs 312 to push the two sub-bodies 311 closer together axially, the second position moves to the third position, where the guide ball 36... The rotating shaft is provided with a third rack 39, on which a gear meshes. At this time, the second rack 38 meshes with the gear, but at this time the rotation of the sub-body 311 should not drive the main body 310 to rotate. Therefore, in the third position, the sub-body 311 and the main body 310 can rotate relative to each other. Then the rotation of the sub-body 311 drives the third rack 39 to deflect through the gear. The third rack 39 then drives the guide ball 36 to deflect, so that the channel on the guide ball 36 faces the symmetrical position of the inner segment 10. After that, the sub-body 311 returns from the third position to the second position. The sub-body 311 drives the main body 310 to release the wound conductor wire 32, which will push the expansion stent 30 into the outer segment 11.

[0046] After the dilation guidewire and drainage tube 1 are cleaned, the auxiliary body 311 drives the main body 310 to wind up the conduction wire 32 in the second position until the conduction wire 32 reaches the guide ball 36 position at the hinge point between the conduction wire 32 and the dilation bracket 30. The auxiliary body 311 then moves from the second position to the third position. The rotation of the auxiliary body 311 drives the third rack 39 to deflect via a gear. The third rack 39 then drives the guide ball 36 to deflect, so that the channel on the guide ball 36 faces the inner section 10. Afterward, the auxiliary body 311 returns from the third position to the second position. When the body 311 drives the main body 310 to release the wound conductive wire 32, it will push the expansion bracket 30 into the body section 10. After receiving the drainage effect, the auxiliary body 311 returns to the first position, the first rack 37 and the second rack 38 mesh again, and the rotation of the auxiliary body 311 pulls the piston block 34 out of the piston chamber 33, so that the protrusion 330 and the recess 340 are separated. Then the expansion and contraction of the airbag cushion 24 can continue to drive the expansion bracket 30 to make axial and radial changes.

[0047] In an optional embodiment, the two knobs 312 are provided with two states between each knob 312 and its corresponding sub-body 311: in the first state, the knob 312 is not connected to the corresponding sub-body 311, and the sub-body 311 rotates under the drive of the piston block 34; in the second state, the knob 312 is connected to the corresponding sub-body 311, and when the two knobs 312 do not simultaneously drive the corresponding sub-body 311 to the first position, the rotation of the two knobs 312 is restricted.

[0048] Specifically, during normal drainage operations, there is a possibility of accidentally touching knob 312, which could adversely affect the drainage effect. Therefore, a knob 312 is placed between the two knobs to prevent the above-mentioned problem from occurring.

[0049] That is, there are two states between the knob 312 and the corresponding sub-body 311. In the first state, the two are not connected, and the rotation of the knob 312 does not drive the corresponding sub-body 311 to rotate. In the second state, the knob 312 is connected to the corresponding sub-body 311, and the rotation of the knob 312 drives the corresponding sub-body 311 to rotate. That is, a plug-in groove 40 is provided on the sub-body 311, and a plug-in block 41 is installed on the knob 312. The plug-in block 41 is plugged into the plug-in groove 40, and the knob 312 can drive the corresponding sub-body 311 to rotate. However, if one sub-body 311 rotates, it will drive the other sub-body 311 to rotate together through the main body 310, which will also affect the drainage effect. Therefore, the limiting structure includes a limiting groove 42 on the rotation shaft corresponding to each knob 312, and a limiting block 43 is slidably provided on the communicating vessel 12. In the sliding direction, the limiting block 43 is connected to the communicating vessel 12. A limiting spring is provided between the two parts. Based on the elastic force of the limiting spring, the limiting block 43 tends to always be inserted into the corresponding limiting groove 42. A push rod 44 is also installed on the rotating shaft corresponding to each knob 312. When one of the knobs 312 drives the insertion block 41 to be inserted into the corresponding insertion groove 40 and pushes the corresponding sub-body 311 from the first position to the second position, the push rod 44 connected to the knob 312 will squeeze the limiting block 43 at the corresponding position to disengage from the limiting groove 42. If the other knob 312 does not drive the connected insertion block 41 to be inserted into the corresponding insertion groove 40, or drives the insertion block 41 to be inserted into the corresponding insertion groove 40 but does not drive the corresponding sub-body 311 to move from the first position to the second position, then the other limiting block 43 will not disengage from the corresponding limiting groove 42. The rotation of both sub-body 311 will be restricted, thereby preventing accidental collision.

[0050] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims

1. A thoracoscopic drainage device for use in thoracic surgery, comprising a drainage tube, the drainage tube including an internal segment and an external segment, the internal segment and the external segment being connected by a communicating vessel, characterized in that, It also includes a fixing unit for securing the drainage tube; The fixing unit includes a connecting plate and a strap provided on the connecting plate. The communicating vessel is provided with a connecting hole, and a connecting plug is installed on the connecting plate. After the internal segment is inserted into the patient's body, the connecting plug is plugged into the connecting hole. An expansion mechanism is provided inside the body segment. The expansion mechanism includes an expansion bracket arranged inside the body segment and a roller arranged on the communicating vessel. A guide wire is wound on the roller. The rotation of the roller drives the expansion bracket to change its radial dimension through the guide wire. The communicating vessel is also provided with a piston chamber. The piston chamber is connected to an air bladder through an air pipe. A piston block is slidably arranged in the piston chamber. Based on the expansion and contraction of the air bladder, the piston block drives the roller to rotate in both directions. The portion of the communicating vessel through which the conductive wire passes is provided with a guide ball that rotates, and an elastic element is provided between the guide ball and the communicating vessel; The roller includes a main body connected to the guide wire and two auxiliary bodies slidably arranged at both ends of the main body along its axial direction. Each auxiliary body is equipped with a knob. The auxiliary body has three positions on the main body: in the first position, the auxiliary body rotates under the drive of the piston block; in the second position, rotating the knob drives the auxiliary body to rotate, and the main body drives the guide wire to move; in the third position, the auxiliary body drives the guide ball to deflect. A limiting mechanism is provided between the two knobs. Each knob and its corresponding sub-body have two states: in the first state, the knob is not connected to the corresponding sub-body, and the sub-body rotates under the drive of the piston block; in the second state, the knob is connected to the corresponding sub-body, and when the two knobs do not simultaneously drive the corresponding sub-body to the first position, the limiting mechanism restricts the rotation of the two knobs.

2. The anti-blockage drainage device for thoracic surgery according to claim 1, characterized in that, An airbag cushion is installed on the side of the connecting plate facing the patient's skin.

3. The anti-blockage drainage device for thoracic surgery according to claim 2, characterized in that, Based on the expansion and contraction of the airbag cushion, the expansion mechanism adjusts the radial dimension of the inner segment.

4. The anti-blockage drainage device for thoracic surgery according to claim 1, characterized in that, The expansion bracket is composed of several interlaced support bars with a columnar spiral structure. The support bars are elastic. Based on the rotation of the roller, the guide wire applies an axial force to the expansion bracket to achieve changes in radial dimensions.

5. The anti-blockage drainage device for thoracic surgery according to claim 4, characterized in that, The surface of the support bar consists of a first surface that abuts against the inner surface of the body segment and a second surface that is far away from the inner surface of the body segment. During the axial movement of the support bar, the junction of the first and second surfaces forms a scraping action on the inner surface of the body segment.

6. The anti-blockage drainage device for thoracic surgery according to claim 1, characterized in that, The conductive wire and the expansion bracket are connected by a hinge, and the swing angle between them is greater than 180 degrees.

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