A transnasal flexible endoscopic minimally invasive surgical instrument for pituitary tumors

Abstract

The present invention provides a transnasal soft endoscopic minimally invasive surgical instrument for pituitary tumors, which relates to the field of medical device technology, including a catheter, an endoscope, an electrocoagulation bipolar stripping blade, an adsorbable irrigation tube, a preliminary fixing mechanism and a blocking hemostasis mechanism; the endoscope angle of the endoscope is adjustable and is used to eliminate blind spots under the microscope, the electrocoagulation bipolar stripping blade can both strip the pituitary gland and electrocoagulate the bleeding site of the wound, making tumor resection more thorough, and is particularly suitable for tumors with suprasellar extension and cavernous sinus invasion; the adsorbable irrigation tube is used for flushing the inside of the channel, and can also strip the pituitary gland by adsorption; the preliminary fixing mechanism is used to fix the catheter and further release the hemostatic agent through the blocking hemostasis mechanism to ensure complete hemostasis of the postoperative bleeding wound. The present invention can be used for high-risk pituitary tumor surgery, and can achieve smaller sellar floor fenestration, multi-segment fixation and local hemostasis, which can significantly improve the treatment effect and reduce surgical trauma.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a transnasal soft endoscopic minimally invasive surgical instrument for pituitary tumors. Background Art

[0002] Currently, traditional methods still rely on craniotomy for resection or tissue sampling of gliomas in the human brain, especially those located in deep areas such as the pituitary, hypothalamic, and clivus regions. This type of surgery is highly invasive and can easily cause severe brain damage, leading to a high incidence of postoperative complications and prolonged recovery. In recent years, with the development of neuroendoscopy and minimally invasive techniques, skull base surgery performed via the nasal route has become a hot topic and innovative direction for research and clinical application.

[0003] Introducing catheters and endoscopic equipment through openings inside the nasal cavity can significantly reduce the damage caused to important intracranial tissues by traditional craniotomy, especially in protecting brain nerves, blood vessels, and normal brain tissue. In existing endoscopic transnasal approach surgical solutions, the irregular area formed by the transnasal skull window is about 15mm to 30mm. The window area is too large and irregular, and existing blocking techniques cannot avoid intracranial infection caused by severe cerebrospinal fluid leakage. At the same time, the traditional bulky handheld endoscope superimposed with additional dissecting surgical instruments, suction devices, and hemostatic electrocoagulation devices will inevitably result in large windows and severe trauma to the nasal lining membrane. The limitations of the existing instrument structure result in insufficient observation and secondary recurrence of pituitary tumors due to incomplete cleaning.

[0004] The significant clinical risks caused by the serious defects and deficiencies of existing instruments have hindered the widespread promotion of transnasal neuroendoscopic pituitary tumor surgery and its use in primary medical institutions. The innovative transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument combines a flexible endoscope and a catheter system. Under the guidance of real-time endoscope images, the doctor can use the doctor's handheld control adjustment device to control the wave wheel through the soft endoscope, precisely controlling the rotation angle of the soft endoscope front end. This allows clear observation of glioma lesions in all directions. After confirming the target tumor area, the clamps extending from the catheter are used to clamp and peel off the tumor tissue. The tumor lesion tissue is then aspirated out of the body with an irrigation and suction tube to complete the resection or sampling.

[0005] The catheter system for this minimally invasive nasal soft endoscopic surgery for pituitary tumors enters the pituitary region through the natural nasal cavity and the skull fenestration. This can easily lead to lens contamination and image blurring. Due to the small surgical area, the surgical instruments can affect image observation, potentially making the surgery more difficult and prolonging the operation time, further increasing surgical risks. Therefore, how to ensure that the fenestration at the skull base is smaller to facilitate postoperative technical closure and reduce cerebrospinal fluid leakage, and how to accurately and thoroughly remove the tumor in the narrow pituitary region without damaging normal brain nerves and blood vessels has become a key technical issue that needs to be urgently addressed in current transnasal endoscopic surgery. Summary of the Invention

[0006] The embodiment of the present application provides a transnasal flexible endoscopic minimally invasive surgical instrument for pituitary tumors, which can reduce the infection caused by cerebrospinal fluid leakage after transnasal surgery for pituitary tumors at the skull base through the natural cavity of the human body, and more thoroughly remove pituitary tumors while preserving normal brain tissue, thereby solving the above-mentioned technical problems.

[0007] To achieve the above-mentioned object, a transnasal flexible endoscopic minimally invasive surgical instrument for pituitary tumors is provided, comprising a handle, a catheter, an electrocoagulation bipolar stripping blade, a flexible endoscope, and an irrigation and suction tube. The catheter is arranged at the front end of the handle, and the electrocoagulation bipolar stripping blade, the flexible endoscope, and the electrocoagulation bipolar stripping blade are all movably arranged in the catheter and can be extended from the distal end of the catheter.

[0008] Also includes:

[0009] A preliminary fixing mechanism is provided on the catheter and is used to fix the catheter to the inner wall of the hole after the catheter is inserted into the hole;

[0010] The blocking and hemostatic mechanism is provided on the catheter and is used to fix the catheter after it is inserted into the channel and block the channel section close to the lesion side, and release the hemostatic agent in the channel section; wherein,

[0011] The preliminary fixing mechanism and the hemostasis blocking mechanism are independent of each other and are not connected to each other.

[0012] Optionally, the preliminary fixing mechanism includes a first instrument inlet, a first inflation tube and a first airbag, wherein:

[0013] The first device inlet is connected to the catheter and is used to connect to external inflation equipment;

[0014] The first inflation tube is arranged in the catheter along the extension direction of the catheter, and one end of the first inflation tube is connected to the first instrument inlet;

[0015] The first airbag is arranged on the outer tube wall of the catheter near the distal opening and is connected to the other end of the first inflation tube;

[0016] When the first airbag is in an inflated state, the first airbag is in circumferential abutment engagement with the inner wall of the channel.

[0017] Optionally, the hemostasis blocking mechanism includes a second instrument inlet, a second inflation tube, a second inflation component, a pressurized release component and a storage tube body; wherein,

[0018] The second device inlet is connected to the catheter and is used to connect to external inflation equipment;

[0019] The second inflation tube is arranged in the catheter along the extension direction of the catheter, and one end of the second inflation tube is connected to the second instrument inlet;

[0020] The second inflation component is provided on the catheter and is in communication with the second inflation tube, and is used to expand and seal the hole section of the channel close to the lesion side and fix the catheter when the external inflation device is filled with gas;

[0021] The pressurized release component is arranged on the catheter, the storage tube body is arranged on the pressurized release component and is used to store the hemostatic agent, the storage tube body has a release port, the pressurized release component is connected to the second inflation tube, and the pressurized release component has a switchable first state and a second state, wherein, when the external inflation device stops injecting gas into the second instrument inlet, the pressurized release component is in the first state and blocks the release port of the storage tube body; when the external inflation device injects gas into the second instrument inlet, the pressurized release component switches from the first state to the second state under the push of the gas, and in this process opens the release port of the storage tube body to allow the hemostatic agent to overflow through the release port into the hole section of the channel close to the lesion side.

[0022] Optionally, the second inflatable component includes a blocking airbag and an abutting airbag, wherein:

[0023] The blocking airbag is provided on the catheter and is located near the distal end of the first airbag. The contact airbag is provided on the catheter and is located near the proximal end of the first airbag. The second inflation tube is sequentially connected to the blocking airbag and the contact airbag along the inflation direction.

[0024] When the blocking airbag is in an inflated state, the radial length of the blocking airbag is greater than the inner diameter of the duct, so that the blocking airbag can block the opening connecting the duct and the lesion in the inflated state;

[0025] When the abutting airbag is in an inflated state, the abutting airbag and the inner wall of the channel are circumferentially abutted against each other.

[0026] Optionally, the blocking airbag and the abutting airbag are configured to form a partition hole section on the hole section of the hole close to the lesion side when both are in an inflated state and the blocking airbag blocks the opening connecting the hole to the nasal cavity, so as to limit the outflow of the hemostatic agent from the hole section on the lesion side of the hole.

[0027] Optionally, the storage tube is provided between the blocking airbag and the abutting airbag, and the radial length of the storage tube is smaller than the inner diameter of the hole;

[0028] The first airbag is circumferentially arranged on the outer wall of the catheter and the outer wall of the storage tube body.

[0029] Optionally, the pressurized release assembly includes an annular guide tube, a sealing sliding ring, a movable blocking piece and an elastic portion, the annular guide tube being coaxially arranged on the outer peripheral wall of the catheter, the storage tube body being circumferentially arranged on the outer peripheral wall of the annular guide tube, one end of the annular guide tube being sealed and the other end being open, the sealing sliding ring being axially slidably arranged in the annular guide tube, and the internal space of the annular guide tube being divided into a separated pressurized area and a displacement area by the sealing sliding ring, the pressurized area being sealed and connected with the second inflation tube, the movable blocking piece being configured so that a part thereof is axially slidable in the displacement area and the other part thereof is blocked on the release port of the storage tube body, the elastic portion being located in the pressurized area and connected between the sealing sliding ring and the inner end wall of the annular guide tube, the elastic portion always having a tendency to axially push the sealing sliding ring toward the opening side away from the annular guide tube; wherein,

[0030] When the second inflation tube fills the pressurized area with gas, the sealing sliding ring drives the movable blocking member to move axially, so that the volume of the pressurized area increases and the volume of the displacement area decreases. At the same time, the movable blocking member is driven to extend from one end of the annular guide tube and the storage tube body opens the release port of the storage tube body. At this time, the pressurized release assembly is in the second state;

[0031] When the second inflation tube stops filling gas into the pressurized area, the volume of the pressurized area decreases and the volume of the displacement area increases. Under the rebound action of the elastic part, the sealing sliding ring drives the movable blocking part to retract into the annular guide tube and causes the movable blocking part to re-block the release port of the storage tube body. At this time, the pressurized release assembly is in the first state.

[0032] Optionally, the movable blocking member includes a movable rod and a rubber piston, wherein the first end of the movable rod is connected to the surface of the sealing sliding ring facing away from the elastic portion, the second end of the movable rod extends axially from the opening of the annular guide tube, and the rubber piston is provided at the second end of the movable rod and is used to block the release port of the storage tube body; wherein,

[0033] When the pressurized release assembly is in a first state, the rubber piston is blocked on the release port of the storage tube body; when the pressurized release assembly is in a second state, the rubber piston is away from the release port of the storage tube body.

[0034] Optionally, a sealing push ring is slidably provided in the storage tube body, and the sealing push ring seals and separates the internal space of the storage tube body into an air pressure chamber and a storage chamber, and the storage chamber is communicated with the release port, and an air pressure hole is penetrated on the tube wall of the annular guide tube, and the air pressure hole is communicated with the air pressure chamber; wherein,

[0035] When the pressurized release assembly is in the first state, the sealing sliding ring blocks the air pressure hole to disconnect the air pressure cavity from the pressurized area;

[0036] When the pressurized release assembly switches from the first state to the second state, the sealing sliding ring moves away from the air pressure hole, so that the air pressure cavity is connected to the pressurized area through the air pressure hole.

[0037] Optionally, a rubber ring is provided on the outer wall of the catheter, and the rubber ring is located between the abutting airbag and the release port, and is used to limit the contact between the movable blocking member and the abutting airbag.

[0038] This application has at least the following beneficial effects:

[0039] The present invention provides a transnasal soft endoscopic minimally invasive surgical instrument for pituitary tumors. By providing a cooperative structure of a preliminary fixing mechanism and a blocking hemostasis mechanism, it can achieve multi-level fixation and effective hemostasis of the catheter during minimally invasive surgery, thereby improving the stability of the catheter's positioning in the patient's nasal cavity and orifice and the safety of intraoperative operation. The preliminary fixing mechanism cooperates with the first instrument inlet, the first inflation tube, and the first airbag, so that the first airbag expands in the orifice and forms a circumferential stop fit with the inner wall of the orifice, thereby quickly achieving basic positioning of the catheter in the early stage of surgery; further, the blocking airbag and the contact airbag in the blocking hemostasis mechanism are inflated in the orifice in sequence, not only strengthening the multi-point fixation effect of the catheter, but also sealing the opening of the orifice close to the lesion side after the blocking airbag is inflated, which is beneficial to forming a relatively sealed partition hole section, so that the hemostatic agent acts on the lesion site, reducing the risk of hemostatic agent loss, and improving hemostasis efficiency. The phased action sequence and gas pressure control logic of the above-mentioned mechanism can achieve safe sliding of the catheter during the entry and exit process and stable positioning during surgery. It is not only suitable for ordinary patients, but also especially for patients with pituitary tumors who have narrow nasal passages, fragile tissues or frequent bleeding risks. On the basis of improving the accuracy of intraoperative catheter control, it further improves intraoperative bleeding control and visual field clarity, thereby enhancing the operational controllability and clinical success rate of the entire minimally invasive surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0041] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0042] Figure 1 is a schematic diagram of the overall structure of a surgical instrument provided in an exemplary embodiment of the present disclosure;

[0043] Figure 2 This is a partial state diagram of the front end of the surgical instrument provided in an exemplary embodiment of the present disclosure. Figure 1 ;

[0044] Figure 3 This is a partial state diagram of the front end of the surgical instrument provided in an exemplary embodiment of the present disclosure. Figure 2 ;

[0045] Figure 4 This is a partial state diagram of the front end of the surgical instrument provided in an exemplary embodiment of the present disclosure. Figure 3 ;

[0046] Figure 5 is a schematic diagram of a partial structure of a catheter provided in an exemplary embodiment of the present disclosure;

[0047] Figure 6 The internal inflation state of the catheter provided in the exemplary embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0048] Figure 7 yes Figure 6 A magnified view of part A in FIG;

[0049] Figure 8 The internal inflation state of the catheter provided in the exemplary embodiment of the present disclosure is shown in FIG. Figure 2 .

[0050] Description of reference numerals:

[0051] 1. Handle; 11. Catheter; 12. Electrocoagulation bipolar stripping blade; 13. Irrigation and suction tube; 14. Soft endoscope;

[0052] 2. Preliminary fixing mechanism; 21. First instrument inlet; 22. First inflation tube; 23. First airbag;

[0053] 3. Blocking hemostasis mechanism; 31. Second instrument inlet; 32. Second inflation tube; 33. Second inflation assembly; 331. Blocking airbag; 332. Abutting airbag; 34. Pressurization release assembly; 341. Annular guide tube; 341a. Pressurization area; 341b. Displacement area; 341c. Air pressure hole; 342. Sealing sliding ring; 343. Movable blocking member; 3431. Movable rod; 3432. Rubber piston; 344. Elastic portion; 35. Storage tube; 351. Release port; 352. Reservoir chamber; 353. Air pressure chamber;

[0054] 4. Sealing push ring;

[0055] 5. Rubber ring. DETAILED DESCRIPTION

[0056] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0057] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0058] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of each component relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0059] This application provides a transnasal soft endoscopic pituitary tumor minimally invasive surgical instrument, please refer to Figures 1 to 7 .

[0060] A transnasal soft endoscopic pituitary tumor minimally invasive surgical instrument, combined with Figures 1 to 4It includes a handle part 1, a catheter 11, an electrocoagulation bipolar stripping blade head 12, a soft mirror 14 and a flushing and suction tube 13. The catheter 11 is arranged at the front end of the handle part 1. The electrocoagulation bipolar stripping blade head 12, the soft mirror 14 and the flushing and suction tube 13 are all movably arranged inside the catheter 11 and can be extended from the distal end of the catheter 11 to realize the observation, clamping and suction operations of the glioma at the lesion site under the image guidance of the soft mirror 14.

[0061] For example, the handle 1 is provided with a lens control wheel, which is connected to the soft endoscope 14 and is used to control the position of the soft endoscope 14 within the catheter 11. At the same time, the handle 1 is also provided with a bipolar forceps opening and closing wheel, which is connected to the electrocoagulation bipolar stripping blade 12 and is used to control the position of the electrocoagulation bipolar stripping blade 12 within the catheter 11.

[0062] For example, combined Figure 1 、 Figure 4 A preliminary fixing mechanism 2 is provided on the outer wall of the catheter 11. This mechanism is used to provide a certain degree of support and friction with the inner wall of the nasal passage after the catheter 11 passes through the nasal opening and enters the passage. This allows the catheter 11 to maintain a relatively stable state during operation, which helps reduce the shaking of the catheter 11 when the electrocoagulation bipolar stripping blade 12 is extended to perform a lesion clamping operation, thereby reducing mechanical interference with the inner wall of the passage and reducing patient discomfort and tissue trauma during the operation. The preliminary fixing mechanism 2 can take the form of an elastic support structure, a deployable anchor, or an adjustable expansion ring. Its fixing effect can be matched and adapted to a certain extent according to the actual shape of the passage, and does not rely on the complete regularity of the passage structure. It is suitable for most patients with good physical fitness and good nasal tissue elasticity.

[0063] Furthermore, in order to meet the surgical needs of some patients who have severe trauma to the edge of the nasal passage due to physical differences, are prone to bleeding, and require additional treatment, the present invention also provides a blocking hemostasis mechanism 3 on the catheter 11. The blocking hemostasis mechanism 3 is provided on the outer wall of the catheter 11 and is located near the front end of the catheter 11. It is used to locally block the hole section of the passage close to the lesion side after the catheter 11 enters the passage and is positioned. At the same time, it releases a hemostatic agent in a targeted manner to the area in the blocked state. The blocking hemostasis mechanism 3 can be implemented by means of an inflatable bag, an inflatable structure, or a fluid-expandable seal, and the form of releasing the hemostatic agent can be through microporous release, biodegradable material coating, pressurized release, etc. to achieve targeted hemostasis treatment of the area. By setting the blocking hemostasis mechanism 3, the time delay and incomplete tissue treatment in the artificial hemostasis process can be avoided to a certain extent, thereby improving the overall surgical efficiency and reducing the risk during the operation. It should be noted that the preliminary fixation mechanism 2 and the occluding hemostasis mechanism 3 are two independent structural units. The two are not structurally connected and can be activated independently in function, so that the device can flexibly choose which mechanism to use according to the actual situation of the patient, thereby improving the adaptability and flexibility of the device in actual clinical applications.

[0064] The "fixing of the catheter 11" mentioned in this embodiment refers to the use of friction, support or blocking to keep the shaking of the catheter 11 within a controllable range during operation, and the non-guiding catheter 11 is completely stationary. The "channel" refers to the passage opened in the nasal cavity for inserting the catheter 11 and surgical instruments and connected to the lesion, including the bone opening section and the soft tissue section where it connects with the nasal tissue. The "releasing hemostatic agent" refers to the directional delivery of a substance with a hemostatic function to the target area. The release method can be slow release, rapid diffusion, external coating, etc. The specific implementation can be adapted according to the type of hemostatic agent. In summary, the structure provided in this embodiment can achieve stable support and necessary hemostatic treatment for the insertion of the catheter 11 under different patient conditions by rationally configuring the preliminary fixing mechanism 2 and the blocking hemostatic mechanism 3, which is beneficial to improving the safety, efficiency and adaptability of the surgical process.

[0065] In some embodiments, combined Figure 1 、 Figure 5 、 Figure 6 as well as Figure 8The preliminary fixation mechanism 2 includes a first instrument inlet 21, a first inflation tube 22, and a first airbag 23. The first instrument inlet 21 is located on the exterior of the catheter 11 and communicates with the interior of the catheter 11. It is also used to connect to an external inflation device, thereby providing a gas source for inflating the internal airbag. The first inflation tube 22 is located within the interior space of the catheter 11 along its extension. One end of the first inflation tube 22 communicates with the first instrument inlet 21, and the other end communicates with a first airbag 23 located on the outer wall of the catheter 11. The first airbag 23 is located on the outer wall of the catheter 11 near the distal opening, near the deep area where the catheter 11 extends into the duct. In actual use, after the catheter 11 is inserted into the duct through the nasal opening and advanced to the desired surgical position, the external inflation device can pressurize the first inflation tube 22 through the first instrument inlet 21. Gas is then transported along the first inflation tube 22 to the first airbag 23, causing it to inflate. The inflated first balloon 23 expands radially and forms a circumferential stop against the inner wall of the channel, thereby stabilizing the catheter 11 within the channel, limiting its wobbling and reducing leakage of cerebrospinal fluid from the channel. This structure helps maintain the overall stability of the catheter 11 during clamping operations with the electrocoagulation bipolar dissection blade 12 or when adjusting the viewing angle of the flexible endoscope 14, reducing contact with the inner wall of the channel caused by wobbling catheter 11, and helping to reduce patient discomfort and the risk of tissue damage during surgery.

[0066] In this embodiment, "circumferential stop fit" means that when the first airbag 23 is inflated, its outer surface forms a fit or support state with the inner wall of the channel in multiple directions around the catheter 11, so as to achieve radial limitation of the catheter 11 and improve stability. The "first airbag 23" does not specifically refer to an airbag of a fixed shape or material. It can be made of medical elastic material with good expansion performance and biocompatibility, and its size after inflation can vary within a certain range to adapt to the diameter differences of the channels of different patients. The setting of this preliminary fixing mechanism 2 can achieve the positioning and limiting function of the catheter 11 body without affecting the normal extension and operation of the front-end instruments of the catheter 11 (such as the electrocoagulation bipolar stripping blade 12, the soft endoscope 14 and the flushing and suction tube 13), thereby improving the stable operability of the instruments during surgery, which has positive significance for improving surgical efficiency and reducing intraoperative risks.

[0067] In some examples, combined Figure 1 、 Figure 5 、 Figure 6 as well as Figure 8The hemostatic sealing mechanism 3 includes a second instrument inlet 31, a second inflation tube 32, a second inflation assembly 33, a pressurized release assembly 34, and a storage tube 35. The second instrument inlet 31 is disposed outside the catheter 11 and is connected to the second inflation tube 32 inside the catheter 11 for connecting to an external inflation device to provide gas power for the operation of the hemostatic sealing mechanism 3.

[0068] The second inflation tube 32 is arranged in the internal space of the catheter 11 along the axial direction of the catheter 11. One end of the second inflation tube 32 is connected to the second instrument inlet 31, and the other end is connected to the second inflation component 33 disposed on the outside of the catheter 11. The second inflation component 33 is disposed near the distal end of the catheter 11 and is capable of inflating when external gas enters. It expands radially to form a fit with the inner wall of the hole section of the channel near the lesion side, thereby playing a dual role of blocking the hole section and fixing the catheter 11 to a certain extent. Here, "blocking" refers to the partial or relatively complete filling of the channel space by the inflation structure to limit the spread of local bleeding, while "fixing the catheter 11" refers to limiting the axial and radial displacement of the catheter 11 by contact with the inner wall of the channel.

[0069] Meanwhile, a pressurized release assembly 34 is mounted on the catheter 11. A storage tube 35 is mounted on the pressurized release assembly 34 and is used to hold a liquid or gel-like hemostatic agent. The storage tube 35 has a release port 351, which is initially sealed by the pressurized release assembly 34 to prevent premature escape of the hemostatic agent. The pressurized release assembly 34 is connected to the second inflation tube 32 and has a switchable first and second states. In the first state, the pressurized release assembly 34 blocks the release port 351 of the storage tube 35. When an external inflation device injects gas into the second instrument inlet 31, the pressure in the second inflation tube 32 rises, pushing the pressurized release assembly 34 into the second state, thereby opening the release port 351 of the storage tube 35. This allows the hemostatic agent to be released outside the catheter 11 and distributed along the catheter 11 wall within the duct section near the lesion, thereby achieving localized rapid hemostasis.

[0070] With this arrangement, the structure, in synergy with the second inflatable component 33, not only stops bleeding but also secures the catheter 11, thereby reducing local friction and further bleeding caused by movement of the catheter 11. This improves hemostasis efficiency and shortens the time required for patients with weak constitutions, fragile tissues, or those at high risk of intraoperative bleeding. Furthermore, the pressure release component 34 remains stationary when not in a ventilated state, facilitating long-term storage of the hemostatic agent and preventing preoperative leakage or contamination.

[0071] It is worth noting that the "second inflatable component 33" in this embodiment can be an annular airbag or multiple distributed expansion chambers, and can be made of medical silicone or other biocompatible elastic materials. In summary, this hemostatic blocking mechanism 3 not only provides rapid hemostasis but also stabilizes the catheter 11, contributing to improved safety and efficiency of the overall surgical procedure.

[0072] In some cases, combined Figure 1 、 Figure 5 、 Figure 6 as well as Figure 8 The second inflatable component 33 specifically includes a blocking airbag 331 and a contact airbag 332, which are arranged at intervals on the outer wall of the catheter 11 and are connected to the second inflation tube 32 in sequence along its inflation direction. The blocking airbag 331 is arranged on the catheter 11 and is located near the distal end of the first airbag 23. After inflation, it can form a blocking structure at one end close to the lesion after the catheter 11 is inserted into the channel. The contact airbag 332 is arranged on the catheter 11 and is located near the proximal end of the first airbag 23. Its function is to stop contact with the inner wall of the channel in the circumferential direction, and is used to limit the axial movement of the catheter 11, thereby achieving the initial positioning and stabilization of the catheter 11 to a certain extent. There is an axial spacing between the two, so that the effective deployment of the contact airbag 332 is not affected while the blocking airbag 331 is inflated.

[0073] Exemplarily, the radial length of the blocking balloon 331 is designed to be greater than the inner diameter of the orifice. Furthermore, the radial length of the blocking balloon 331 refers to the length of the blocking balloon 331 in its inflated state plus the outer diameter of the catheter 11. This is intended to effectively seal and block the opening connecting the orifice to the lesion when inflated, allowing the hemostatic agent to remain within the blocked area, thereby concentrating its action on the tissue near the lesion and achieving a good hemostatic effect. The size of the abutting balloon 332 is adapted to the shape of the orifice and, when inflated, effectively adheres to the inner wall of the orifice, further stabilizing the catheter 11 and preventing it from shifting during surgery due to manipulation or slight patient movement. Furthermore, the relative arrangement of the blocking balloon 331 and the abutting balloon 332 effectively "clamps" the orifice section of the catheter 11 in the lesion area, forming a relatively enclosed structural space.

[0074] On this basis, when both the blocking balloon 331 and the abutting balloon 332 are inflated simultaneously, and the blocking balloon 331 seals the opening connecting the duct to the nasal cavity, the duct section proximal to the lesion forms a partitioned section. This section, in other words, is located between the relatively closed structures formed by the inflatable components at both ends, effectively limiting the hemostatic agent from axially spilling out of the catheter 11 to non-targeted areas. This structural design, to a certain extent, helps to increase the local residence time and effective concentration of the hemostatic agent, thereby enhancing the hemostatic effect. Furthermore, the provision of the partitioned section also provides a structural basis for postoperative assessment of hemostatic efficacy, subsequent flushing, or tissue protection. It should be noted that the term "partitioned section," as used herein, refers to the area defined by the spatial isolation structure created by the inflatable components. This does not exclude the possibility of localized leakage or tissue gaps. Therefore, the "closure" of this structure should be understood as a functional closure, sufficient to achieve localized drug retention and stabilize the catheter 11, rather than an absolute seal. In summary, the setting of the blocking airbag 331 and the abutting airbag 332 is beneficial to forming a locally controllable sealing environment after the catheter 11 is inserted, improving the efficiency of the use of hemostatic agents and assisting in stabilizing the catheter 11, and has positive technical value for the accuracy and safety of minimally invasive surgery.

[0075] Furthermore, when the blocking airbag 331 and the abutting airbag 332 are both inflated at the same time and the blocking airbag 331 closes the opening connecting the passage and the nasal cavity, the partition hole section for filling the hemostatic agent has been formed, and the external inflation device can be activated to extract the gas in the first airbag 23, so that the first airbag 23 deflates to make room for the hemostatic agent to stay.

[0076] Exemplarily, the storage tube 35 is positioned between the blocking balloon 331 and the abutting balloon 332, and its radial length is less than the inner diameter of the passageway. It is important to note that the radial length of the storage tube 35 herein refers to the combined radial length of the storage tube 35 and the catheter 11, i.e., this radial length includes the outer diameter of the catheter 11. This prevents the storage tube 35 from clogging the passageway after being filled with the hemostatic agent.

[0077] In some embodiments, combined with Figure 1 、 Figure 5 、 Figure 6 as well as Figure 8 The pressurized release assembly 34 specifically includes an annular guide tube 341, a sealing sliding ring 342, a movable blocking member 343, and an elastic portion 344. These components cooperate to achieve controlled release of the hemostatic agent from the storage tube 35. The annular guide tube 341 is a hollow, annular structure fixedly mounted on the outer circumference of the catheter 11. The storage tube 35 is coaxially arranged circumferentially around the outer circumference of the annular guide tube 341. The annular guide tube 341 is closed at one end and open at the other, providing a direction and range of movement for the movable blocking member 343.

[0078] Furthermore, the sealing sliding ring 342 is an annular structure that can slide axially along the annular guide tube 341, dividing the internal space of the annular guide tube 341 into a separate pressurized area 341a and a displacement area 341b. The pressurized area 341a is in airtight communication with the second inflation tube 32, allowing gas to be input therefrom to generate thrust. The sealing sliding ring 342 is slidably disposed within the displacement area 341b, providing the necessary space for the sealing sliding ring 342 to move.

[0079] Furthermore, the movable blocking member 343 is fixed to the sealing sliding ring 342. A portion of the movable blocking member 343 is located on the side of the sealing sliding ring 342 facing the displacement region 341b and directly opposite the open end of the annular guide tube 341. The other portion of the movable blocking member 343 is used to block the release opening 351 of the storage tube 35. When the sealing sliding ring 342 moves under the thrust, a portion of the movable blocking member 343 moves forward and extends from the open end, pushing the other portion of the movable blocking member 343 away from the release opening 351 of the storage tube 35, allowing the release opening 351 of the storage tube 35 to be opened. The elastic portion 344 is arranged in the pressurized area 341a, between the sealing sliding ring 342 and the closed end of the annular guide tube 341, and plays the role of pushing back the sealing sliding ring 342. When there is no external force, it always maintains a tendency to rebound in the direction of the displacement area 341b, which is beneficial to retract the movable blocking member 343 into the annular guide tube 341 to avoid mechanical damage to the inner wall of the channel or surrounding tissues in the postoperative stage.

[0080] It is worth noting that the volumes of the pressurized area 341a and the displacement area 341b are relative, that is, when the volume of the pressurized area 341a increases, the volume of the displacement area 341b decreases, and when the volume of the pressurized area 341a decreases, the volume of the displacement area 341b increases. The relative change in the volume of the pressurized area 341a and the displacement area 341b is judged instantly based on the current position of the sealing sliding ring 342.

[0081] From the perspective of structural and functional coordination, the design of the pressurized release assembly 34 has a certain sequential response characteristic. Due to the presence of the sealing sliding ring 342, when gas is initially introduced into the second inflation tube 32, the gas first inflates the abutting airbag 332 and the blocking airbag 331. Only when both airbags reach an inflated state and the system gas capacity is limited, will the external continuously input gas pressure begin to act on the sealing sliding ring 342, thereby driving it forward, causing the mobile blocking member 343 to extend from the annular guide tube 341 and open the release port 351 of the storage tube body 35 to release the hemostatic agent. This sequential response characteristic is beneficial to improving the stability of surgical control to a certain extent. Even if an operational error occurs during the inflation process, the hemostatic agent will not be released prematurely when the catheter 11 is not yet stably positioned, thereby reducing the risk of unnecessary tissue irritation or drug waste.

[0082] In addition, the movable blocking member 343 can be passively retracted into the annular guide tube 341 under the pushing action of the elastic part 344, which is beneficial to avoid continuous contact or wear on the inner wall of the channel in the postoperative stage, and is also beneficial to provide a safer operating environment for the subsequent possible removal of the catheter 11 or secondary surgery. In this embodiment, the terms such as "movable blocking member 343", "pressurization area 341a", "displacement area 341b", and "elastic part 344" should be understood as structural parts with specific functional distinctions. Their boundaries and definitions should be defined in combination with the actual structural dimensions and assembly methods. However, the present invention is not limited to a specific size or specific material composition, and can be flexibly adjusted according to the actual surgical environment during implementation. In combination with the above structural design, the pressurized release component 34 improves the responsiveness and controllability of the release of the hemostatic agent to a certain extent, and takes into account the needs of intraoperative safety and postoperative tissue protection, and has good application prospects.

[0083] Exemplarily, the elastic portion 344 is configured as a spring, and an annular fixing plate is provided in the displacement area 341b, with an annular hole passing through the annular fixing plate. One end of the spring is connected to the sealing sliding ring 342, and the other end is connected to the annular fixing plate, and the gas can flow normally through the annular hole.

[0084] In some embodiments, combined with Figure 6 、 Figure 7 and Figure 8The movable blocking member 343 includes a movable rod 3431 and a rubber piston 3432. The first end of the movable rod 3431 is connected to the surface of the sealing sliding ring 342 away from the elastic portion 344. The second end of the movable rod 3431 extends axially from the opening of the annular guide tube 341. The rubber piston 3432 is provided at the second end of the movable rod 3431 and is used to block the release port 351 of the storage tube body 35. When the pressurized release assembly 34 is in the first state, the rubber piston 3432 blocks the release port 351 of the storage tube body 35. When the pressurized release assembly 34 is in the second state, the rubber piston 3432 is away from the release port 351 of the storage tube body 35.

[0085] In this arrangement, the axial movement of the moving rod 3431 in the displacement area 341b of the annular guide tube 341 can drive the rubber piston 3432 to switch between blocking and releasing the release port 351. When the gas in the second inflation tube 32 enters the pressurized area 341a, the gas in the pressurized area 341a will generate a thrust acting on the sealing sliding ring 342, so that the sealing sliding ring 342 drives the moving rod 3431 to move axially in the annular guide tube 341 toward its open end, thereby allowing ... 1 drives the rubber piston 3432 away from the release port 351, allowing the hemostatic agent in the storage tube 35 to flow out of the storage tube 35 through the release port 351. When the second inflation tube 32 no longer inflates the pressurized area 341a, the elastic force of the elastic portion 344 drives the sealing sliding ring 342 to move axially within the displacement area 341b toward the side away from the opening of the annular guide tube 341, thereby causing the movable rod 3431 to retract again, ultimately causing the rubber piston 3432 to block the release port 351 again. It is worth noting that since the hemostatic agent in the storage tube 35 has already flowed out, it is no longer important whether the rubber piston 3432 blocks the release port 351. In other words, if the rubber piston 3432 is no longer sealed and engaged in the release port 351 as in the initial state due to the rebound action of the elastic portion 344, normal use of the present invention will not be affected.

[0086] In some embodiments, combined with Figure 6 、 Figure 7 and Figure 8A sealing push ring 4 is slidably provided in the storage tube body 35, and the sealing push ring 4 seals and separates the internal space of the storage tube body 35 into an air pressure chamber 353 and a storage chamber 352. The storage chamber 352 is communicated with the release port 351, and an air pressure hole 341c is penetrated through the tube wall of the annular guide tube 341, and the air pressure hole 341c is communicated with the air pressure chamber 353; wherein, when the pressurized release component 34 is in the first state, the sealing sliding ring 342 blocks the air pressure hole 341c to disconnect the air pressure chamber 353 from the pressurized area 341a; when the pressurized release component 34 is switched from the first state to the second state, the sealing sliding ring 342 moves away from the air pressure hole 341c to allow the air pressure chamber 353 to communicate with the pressurized area 341a through the air pressure hole 341c.

[0087] It can be understood that when the pressurized release component 34 is in the first state, the second inflatable tube 32 has not yet filled the pressurized area 341a with gas, and the sealing sliding ring 342 is in a static state under the action of the elastic portion 344, and the sealing sliding ring 342 will block the air pressure hole 341c, so that the air pressure cavity 353 and the pressurized area 341a are disconnected; and when the pressurized release component 34 is switched from the first state to the second state, the second inflatable tube 32 will continue to fill the pressurized area 341a with gas, and the sealing sliding ring 342 will be driven by the pushing action of the gas. When the sealing sliding ring 342 moves axially within the displacement region 341b toward the side away from the opening of the annular guide tube 341, it moves away from the air pressure hole 341c, while the pressurized region 341a is directly connected to the air pressure hole 341c. At this time, the gas in the pressurized region 341a enters the air pressure chamber 353 through the air pressure hole 341c, increasing the gas content of the air pressure chamber 353. This in turn pushes the sealing push ring 4 to move within the storage tube 35. Ultimately, the sealing push ring 4 actively pushes the hemostatic agent in the reservoir chamber 352 out of the storage tube 35 through the release port 351. This arrangement facilitates smoother removal of the hemostatic agent from the reservoir chamber 352 and effectively prevents excess hemostatic agent from remaining in the reservoir chamber 352, resulting in waste or failure to achieve a hemostatic effect.

[0088] In some embodiments, combined with Figure 1 、 Figure 5 、 Figure 6 as well as Figure 7To further limit the range of motion of the mobile blocking member 343 and prevent it from moving forward and accidentally damaging other structures, a rubber ring 5 is provided on the outer wall of the catheter 11. The rubber ring 5 is located between the abutting airbag 332 and the release port 351 and is used to limit contact between the mobile blocking member 343 and the abutting airbag 332. When the second inflation tube 32 continuously inflates gas into the displacement region 341b, the sealing sliding ring 342 causes the mobile blocking member 343 to move axially, and the mobile blocking member 343 approaches the rubber ring 5. The rubber ring 5 is made of a medical rubber material with certain elasticity and cushioning properties. Upon contact with the mobile blocking member 343, it will slightly deform to absorb the remaining kinetic energy of the mobile blocking member 343, which helps to limit the mobile blocking member 343 from continuing to move forward and contact the abutting airbag 332. The design of this structure can not only reduce the excessive extension of the mobile blocking member 343 due to inertia or air pressure changes to a certain extent, but also has the function of passively limiting the position of the mobile blocking member 343, thereby reducing the risk of accidental injury to other functional components of the catheter 11, especially other abutting airbags 332.

[0089] Furthermore, the rubber ring 5, as a mechanical blocking element, operates through physical contact braking, offering advantages such as simple structure, high control precision, and ease of processing, which contribute to the safety and controllability of the device during minimally invasive procedures. Furthermore, the contact of the rubber ring 5 can be considered a signal indicating the termination of effective movement of the mobile blocking member 343, helping the surgeon to assess the device's operating status during surgery and proactively respond by stopping air supply. This structural layout reflects meticulous consideration of minimally invasive surgical safety and is particularly valuable in transnasal approaches, where space is limited and tissue is fragile.

[0090] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0091] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0093] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A transnasal flexible endoscopic minimally invasive surgical instrument for pituitary tumors, characterized in that: The invention comprises a handle portion (1), a catheter (11), an electrocoagulation bipolar stripping blade head (12), a soft mirror (14) and an irrigation and suction tube (13); the catheter (11) is arranged at the front end of the handle portion (1); the electrocoagulation bipolar stripping blade head (12), the soft mirror (14) and the electrocoagulation bipolar stripping blade head (12) are all movably arranged in the catheter (11) and can be extended from the distal end of the catheter (11); Also includes: A preliminary fixing mechanism (2) is provided on the conduit (11) and is used to fix the conduit (11) to the inner wall of the channel after the conduit (11) is inserted into the channel; The blocking and hemostatic mechanism (3) is provided on the catheter (11) and is used to fix the catheter (11) after the catheter (11) is inserted into the channel, and simultaneously block the channel section close to the lesion side, and release a hemostatic agent in the channel section; wherein, The preliminary fixing mechanism (2) and the hemostasis blocking mechanism (3) are independent of each other and are not connected to each other; The preliminary fixing mechanism (2) comprises a first instrument inlet (21), a first inflation tube (22) and a first airbag (23), wherein the first instrument inlet (21) is connected to the catheter (11) and is used to connect to an external inflation device; the first inflation tube (22) is arranged in the catheter (11) along the extension direction of the catheter (11), and one end of the first inflation tube (22) is connected to the first instrument inlet (21); the first airbag (23) is arranged on the outer tube wall of the catheter (11) near the distal opening and is connected to the other end of the first inflation tube (22); when the first airbag (23) is in an inflated state, the first airbag (23) is circumferentially stopped against the inner wall of the channel; The hemostasis blocking mechanism (3) comprises a second instrument inlet (31), a second inflation tube (32), a second inflation component (33), a pressurized release component (34) and a storage tube body (35); wherein, The second device inlet (31) is connected to the catheter (11) and is used to connect to external inflation equipment; The second inflation tube (32) is arranged in the catheter (11) along the extension direction of the catheter (11), and one end of the second inflation tube (32) is connected to the second instrument inlet (31); The second inflation component (33) is provided on the catheter (11) and is connected to the second inflation tube (32), and is used to expand and block the hole section of the channel close to the lesion side and fix the catheter (11) when the external inflation device is filled with gas; The pressurized release component (34) is provided on the catheter (11), the storage tube body (35) is provided on the pressurized release component (34) and is used to store the hemostatic agent, the storage tube body (35) has a release port (351), the pressurized release component (34) is connected to the second inflation tube (32), and the pressurized release component (34) has a switchable first state and a second state, wherein, when the external inflation device stops injecting gas into the second instrument inlet (31), the pressurized release component (34) is in the first state and blocks the release port (351) of the storage tube body (35); when the external inflation device injects gas into the second instrument inlet (31), the pressurized release component (34) switches from the first state to the second state under the driving action of the gas, and in this process opens the release port (351) of the storage tube body (35) so that the hemostatic agent overflows through the release port (351) into the hole section of the channel close to the lesion side.

2. The transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument according to claim 1, characterized in that: The second inflatable component (33) includes a blocking airbag (331) and an abutting airbag (332), wherein: The blocking airbag (331) is provided on the catheter (11) and is located near the distal end of the first airbag (23); the abutting airbag (332) is provided on the catheter (11) and is located near the proximal end of the first airbag (23); and the second inflation tube (32) is sequentially connected to the blocking airbag (331) and the abutting airbag (332) along the inflation direction; When the blocking airbag (331) is in an inflated state, the radial length of the blocking airbag (331) is greater than the inner diameter of the duct, so that the blocking airbag (331) can block the opening connecting the duct and the lesion in the inflated state; When the abutting airbag (332) is in an inflated state, the abutting airbag (332) is in circumferential abutment engagement with the inner wall of the hole.

3. The transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument according to claim 2, characterized in that: The blocking airbag (331) and the abutting airbag (332) are configured such that when both are in an inflated state and the blocking airbag (331) blocks the opening connecting the channel and the nasal cavity, the hole section of the channel close to the lesion side is formed into a partition hole section to limit the outflow of the hemostatic agent from the hole section of the channel close to the lesion side.

4. The transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument according to claim 1, characterized in that: The storage tube body (35) is arranged between the blocking airbag (331) and the abutting airbag (332), and the radial length of the storage tube body (35) is smaller than the inner diameter of the channel; The first airbag (23) is circumferentially arranged on the outer wall of the catheter (11) and the outer wall of the storage tube body (35).

5. The transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument according to claim 2, characterized in that: The pressurized release assembly (34) includes an annular guide tube (341), a sealing sliding ring (342), a movable blocking member (343) and an elastic portion (344). The annular guide tube (341) is coaxially arranged on the outer peripheral wall of the catheter (11). The storage tube body (35) is circumferentially arranged on the outer peripheral wall of the annular guide tube (341). One end of the annular guide tube (341) is sealed and the other end is open. The sealing sliding ring (342) is axially slidable in the annular guide tube (341), and the internal space of the annular guide tube (341) is divided into separated pressurized areas (341a) and The displacement area (341b), the pressurized area (341a) is sealed and connected to the second inflation tube (32), the movable blocking member (343) is configured so that a portion thereof is axially slidable in the displacement area (341b), and the other portion thereof is used to block the release port (351) of the storage tube body (35), the elastic portion (344) is located in the pressurized area (341a) and connected between the sealing sliding ring (342) and the inner end wall of the annular guide tube (341), and the elastic portion (344) always has a tendency to axially push the sealing sliding ring (342) toward the opening side away from the annular guide tube (341); wherein, When the second inflation tube (32) fills the pressurized area (341a) with gas, the sealing sliding ring (342) drives the movable blocking member (343) to move axially, so that the volume of the pressurized area (341a) increases and the volume of the displacement area (341b) decreases, and at the same time drives the movable blocking member (343) to extend from one end of the annular guide tube (341) and open the release port (351) of the storage tube body (35). At this time, the pressurized release assembly (34) is in the second state; When the second inflation tube (32) stops filling gas into the pressurized area (341a), the volume of the pressurized area (341a) decreases and the volume of the displacement area (341b) increases. Under the rebound action of the elastic part (344), the sealing sliding ring (342) drives the movable blocking member (343) to retract into the annular guide tube (341) and causes the movable blocking member (343) to reseal the release port (351) of the storage tube body (35). At this time, the pressurized release assembly (34) is in the first state.

6. A transnasal soft endoscopic pituitary tumor minimally invasive surgical instrument according to claim 5, wherein the movable blocking member (343) comprises a movable rod (3431) and a rubber piston (3432), the first end of the movable rod (3431) is connected to the surface of the sealing sliding ring (342) facing away from the elastic portion (344), the second end of the movable rod (3431) extends axially from the opening of the annular guide tube (341), and the rubber piston (3432) is provided at the second end of the movable rod (3431) and is used to block the release port (351) of the storage tube body (35); wherein, When the pressurized release assembly (34) is in a first state, the rubber piston (3432) blocks the release port (351) of the storage tube body (35); when the pressurized release assembly (34) is in a second state, the rubber piston (3432) is away from the release port (351) of the storage tube body (35).

7. The transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument according to claim 5, characterized in that: A sealing push ring (4) is slidably provided in the storage tube body (35), and the sealing push ring (4) seals and separates the internal space of the storage tube body (35) into an air pressure chamber (353) and a storage chamber (352), and the storage chamber (352) is communicated with the release port (351). An air pressure hole (341c) is provided through the tube wall of the annular guide tube (341), and the air pressure hole (341c) is communicated with the air pressure chamber (353); wherein, When the pressurized release assembly (34) is in the first state, the sealing sliding ring (342) blocks the air pressure hole (341c) to disconnect the air pressure chamber (353) from the pressurized area (341a); When the pressurized release assembly (34) switches from the first state to the second state, the sealing sliding ring (342) moves away from the air pressure hole (341c) so that the air pressure chamber (353) is connected to the pressurized area (341a) through the air pressure hole (341c).

8. The transnasal flexible endoscopic pituitary tumor minimally invasive surgical instrument according to claim 7, characterized in that: The outer wall of the catheter (11) is provided with a rubber ring (5), and the rubber ring (5) is located between the abutting airbag (332) and the release port (351), and is used to limit the contact between the movable blocking member (343) and the abutting airbag (332).

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