Nasal soft endoscope pituitary tumor minimally invasive surgical instrument

Abstract

The invention provides a transnasal soft endoscope pituitary tumor minimally invasive surgical instrument, which relates to the technical field of medical instruments, and comprises a catheter, an endoscope, an electrocoagulation bipolar stripping cutter head, an adsorbable flushing tube, a preliminary fixing mechanism and a plugging hemostasis mechanism, the endoscope angle of the endoscope is adjustable, the endoscope is used for eliminating a blind area under a microscope, the electrocoagulation bipolar stripping tool bit can strip a pituitary body and also can electrocoagulate a bleeding part of a wound surface, so that tumor excision is more thorough, and the electrocoagulation bipolar stripping tool bit is particularly suitable for tumors expanded on a saddle and invaded by sponge sinus; the adsorbable flushing pipe is used for flushing the interior of the hole channel, and meanwhile the pituitary body can be stripped through an adsorption means; the preliminary fixing mechanism is used for fixing the catheter and further releasing hemostatic through the blocking hemostasis mechanism, and it is ensured that bleeding wounds after operation are completely stopped. The device can be used for a high-risk pituitary tumor operation, smaller saddle bottom windowing, multi-section fixing and local hemostasis can be achieved, the treatment effect can be remarkably improved, and operation wounds can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope. Background Art

[0002] Currently, when removing or taking tissue samples of gliomas in the human brain, especially those located in deep regions such as the pituitary region, hypothalamus region, and clivus region, traditional methods still rely on craniotomy. Such surgeries are highly traumatic and extremely likely to cause severe brain damage, resulting in a high incidence of postoperative complications and an extended recovery period for patients. In recent years, with the development of neuroendoscopy and minimally invasive techniques, skull base surgeries carried out through the nasal cavity approach have become a hot topic and an innovative direction in research and clinical applications.

[0003] By introducing a catheter and an endoscope device through an opening inside the nasal cavity, the damage to important intracranial tissues caused by traditional craniotomy can be significantly reduced, especially in protecting cranial nerves, blood vessels, and normal brain tissues. In existing endoscopic transnasal approach surgical schemes, the irregular area formed by opening the nasal cavity skull window is about 15 mm to 30 mm. The window area is too large and irregular, and existing sealing technical methods cannot avoid intracranial infections caused by severe cerebrospinal fluid leakage. At the same time, the traditional bulky handheld endoscope combined with additional dissection surgical instruments, suction devices, and hemostatic electrocoagulation instruments will inevitably result in a large window and significant trauma to the nasal inner wall membrane. The limitations of the existing instrument structure lead to insufficient observation and incomplete removal of pituitary tumors, resulting in secondary recurrence.

[0004] The huge clinical risks caused by the serious defects and deficiencies of existing instruments have hindered the large-scale promotion of transnasal neuroendoscopic pituitary tumors and the use in primary medical institutions. The innovative minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope combines a flexible endoscope and a catheter system. Under the real-time image guidance of the endoscope, doctors can, by holding and controlling the adjustment device and turning the control wheel of the flexible endoscope, precisely control the rotation angle of the front end of the flexible endoscope, clearly observe the lesion conditions in all directions of the glioma, and after confirming the target in the tumor area, clamp and dissect the tumor tissue of the tumor body through the jaws extended from the catheter, and then cooperate with the flushing and suction tube to aspirate the tumor lesion tissue out of the body to complete the resection or sampling.

[0005] The minimally invasive surgical instrument catheter system for pituitary tumors using a flexible nasal endoscope enters the pituitary region through the natural nasal cavity of the human body and the cranial fenestration hole. It is prone to lens contamination, blurred images, and shaking. Due to the narrow surgical area, the surgical instruments affect image observation, which may increase the surgical difficulty. The extension of the surgical time will further increase the surgical risk. Therefore, how to reduce the size of the cranial base fenestration hole for easy postoperative technical occlusion to reduce cerebrospinal fluid leakage, precisely and thoroughly remove tumors in the narrow pituitary region, and at the same time not damage normal cranial nerves, blood vessels, etc. has become a key technical problem urgently to be solved in current transnasal endoscopic surgery. Summary of the Invention

[0006] An embodiment of the present application provides a minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope, which can reduce the infection caused by cerebrospinal fluid leakage after transnasal endoscopic pituitary tumor surgery, and more thoroughly remove pituitary tumors while preserving normal brain tissues, so as to solve the above technical problems.

[0007] To achieve the above object, a minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope is provided, which includes a handle part, a catheter, an electrocoagulation bipolar dissection knife head, a flexible endoscope, and a flushing and suction tube. The catheter is arranged at the front end of the handle part. The electrocoagulation bipolar dissection knife head, the flexible endoscope, and the electrocoagulation bipolar dissection knife head are all movably arranged in the catheter and can extend out from the distal port of the catheter. It further includes: A preliminary fixing mechanism, which is arranged on the catheter and is used to fix the catheter to the inner wall of the hole after the catheter extends into the hole; A plugging and hemostasis mechanism, which is arranged on the catheter and is used to fix the catheter and plug the hole segment near the lesion side of the hole while releasing a hemostatic agent in this hole segment after the catheter extends into the hole; wherein, The preliminary fixing mechanism and the plugging and hemostasis mechanism are independent of each other and not communicated with each other.

[0008] Optionally, the preliminary fixing mechanism includes a first instrument inlet, a first inflatable tube, and a first airbag. Among them, The first instrument inlet is communicatively arranged on the catheter and is used to connect with an external inflating device; The first inflatable tube is arranged in the catheter along the extension direction of the catheter, and one end of the first inflatable tube is communicated with the first instrument inlet; The first airbag is arranged on the outer tube wall of the catheter near the distal opening and is communicated with the other end of the first inflatable tube; When the first airbag is in an inflated state, the first airbag is in circumferential abutting cooperation with the inner wall of the hole.

[0009] Optionally, the plugging and hemostasis mechanism includes a second instrument inlet, a second inflatable tube, a second inflating component, a pressurizing and releasing component, and a storage tube body; among them, The second instrument inlet is communicatively disposed on the catheter and is used to connect to an external inflation device; The second inflatable tube is disposed in the catheter along the extension direction of the catheter, and one end of the second inflatable tube is communicatively connected to the second instrument inlet; The second inflation assembly is disposed on the catheter and is communicatively connected to the second inflatable tube, and is used to expand and block the hole section near the lesion side of the hole and fix the catheter when an external inflation device inflates gas; The pressure release assembly is disposed on the catheter, the storage tube body is disposed on the pressure release assembly and is used to store the hemostatic agent, the storage tube body has a release port, the pressure release assembly is communicatively connected to the second inflatable tube, and the pressure release assembly has a switchable first state and second state. Wherein, when the external inflation device stops inflating gas into the second instrument inlet, the pressure release assembly is in the first state and blocks the release port of the storage tube body; when the external inflation device inflates gas into the second instrument inlet, the pressure release assembly is pushed by the gas and switches from the first state to the second state, and in this process, the release port of the storage tube body is opened, so that the hemostatic agent overflows into the hole section near the lesion side of the hole through the release port.

[0010] Optionally, the second inflation assembly includes a blocking airbag and a fitting airbag, wherein, The blocking airbag is disposed on the catheter and is located on the distal side of the first airbag, the fitting airbag is disposed on the catheter and is located on the proximal side of the first airbag, and the second inflatable tube is communicatively connected to the blocking airbag and the fitting airbag in sequence along the inflation direction; When the blocking airbag is in an inflated state, the radial length of the blocking airbag is greater than the inner diameter of the hole, so that the blocking airbag can block the opening where the hole communicates with the lesion in the inflated state; When the fitting airbag is in an inflated state, the fitting airbag is circumferentially abutted and cooperated with the inner wall of the hole.

[0011] Optionally, the blocking airbag and the fitting airbag are configured such that when both are in an inflated state and the blocking airbag blocks the opening where the hole communicates with the nasal cavity, the hole section near the lesion side of the hole forms a partitioned hole section to limit the outflow of the hemostatic agent from the hole section near the lesion side of the hole.

[0012] Optionally, the storage tube body is disposed between the blocking airbag and the fitting airbag, and the radial length of the storage tube body is less than the inner diameter of the hole; The first airbag is circumferentially disposed on the outer wall of the catheter and the outer wall of the storage tube body.

[0013] Optionally, the pressure release assembly includes an annular guiding tube, a sealing sliding ring, a moving plugging member, and an elastic part. The annular guiding tube is coaxially arranged on the outer peripheral wall of the catheter. The storage tube body is circumferentially arranged on the outer peripheral wall of the annular guiding tube. One end of the annular guiding tube is sealed and the other end is open. The sealing sliding ring axially slides in the annular guiding tube, and the internal space of the annular guiding tube is divided into a partitioned pressurized area and a displacement area by the sealing sliding ring. The pressurized area is hermetically communicated with the second gas injection tube. The moving plugging member is configured such that a part of it can axially slide in the displacement area and the other part plugs the release port of the storage tube body. The elastic part is located in the pressurized area and is connected between the sealing sliding ring and the inner end wall of the annular guiding tube. The elastic part always has a tendency to axially push the sealing sliding ring towards the side away from the opening of the annular guiding tube. Among them, When the second gas injection tube injects gas into the pressurized area, the sealing sliding ring drives the moving plugging member to axially move, so that the volume of the pressurized area increases and the volume of the displacement area decreases. At the same time, it drives the moving plugging member to extend out from one end of the annular guiding tube and opens the release port of the storage tube body by the storage tube body. At this time, the pressure release assembly is in the second state; When the second gas injection tube pauses injecting gas into the pressurized area, the volume of the pressurized area decreases and the volume of the displacement area increases. The sealing sliding ring drives the moving plugging member to retract back into the annular guiding tube again under the rebounding action of the elastic part and makes the moving plugging member plug the release port of the storage tube body again. At this time, the pressure release assembly is in the first state.

[0014] Optionally, the moving plugging member includes a moving rod and a rubber piston. The first end of the moving rod is connected to the surface of the sealing sliding ring away from the elastic part. The second end of the moving rod axially extends out from the opening of the annular guiding tube. The rubber piston is arranged at the second end of the moving rod and is used to block the release port of the storage tube body. Among them, When the pressure release assembly is in the first state, the rubber piston blocks the release port of the storage tube body; when the pressure release assembly is in the second state, the rubber piston is away from the release port of the storage tube body.

[0015] Optionally, a sealing push ring is slidably arranged in the storage tube body. The sealing push ring hermetically divides the internal space of the storage tube body into a pneumatic cavity and a reagent storage cavity. The reagent storage cavity is communicated with the release port. An air pressure hole is penetrated through the tube wall of the annular guiding tube, and the air pressure hole is communicated with the pneumatic cavity. Among them, When the pressure release assembly is in the first state, the sealing sliding ring blocks the air pressure hole, so that the pneumatic cavity is disconnected from the pressurized area; During the process of the pressure release assembly switching from the first state to the second state, the sealed sliding ring moves away from the air pressure hole, so that the air pressure chamber communicates with the pressurized area through the air pressure hole.

[0016] 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 for restricting the moving plug from contacting the abutting airbag.

[0017] The present application has at least the following beneficial effects: A minimally invasive surgical instrument for pituitary tumors with a flexible nasal endoscope provided by the present invention, through the collaborative structure of the preliminary fixing mechanism and the plugging and hemostasis mechanism, can achieve multi-stage fixation and effective hemostasis of the catheter during the minimally invasive surgery, thereby improving the stability of the catheter positioning in the patient's nasal cavity and duct and the safety of intraoperative operation. The preliminary fixing mechanism, through the cooperation of the first instrument inlet, the first inflatable tube and the first airbag, enables the first airbag to expand in the duct and form a circumferential abutting fit with the inner wall of the duct, so as to quickly realize the basic positioning of the catheter at the initial stage of the operation; further, the plugging airbag and the abutting airbag in the plugging and hemostasis mechanism are inflated in the duct in sequence, which not only strengthens the multi-point fixing effect of the catheter, but also closes the opening near the lesion side of the duct after the plugging airbag is inflated, which is beneficial to form a relatively sealed partition duct segment, so that the hemostatic agent acts on the lesion site intensively, reduces the risk of hemostatic agent loss, and improves the hemostasis efficiency. The staged action sequence and gas pressure control logic of the above mechanisms can realize the safe sliding and intraoperative stable positioning of the catheter during the process of advancing and retreating, which is not only applicable to ordinary patients, but also especially applicable to pituitary tumor patients with narrow nasal cavity channels, fragile tissues or frequent bleeding risks. On the basis of improving the accuracy of intraoperative catheter control, it further improves intraoperative bleeding control and field of view clarity, thereby enhancing the operability and clinical success rate of the entire minimally invasive surgery. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application, and those skilled in the art can obtain other drawings without creative efforts based on these drawings.

[0019] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals in the following description represent the same parts.

[0020] Figure 1 It is a schematic diagram of the overall structure of the surgical instrument provided in the exemplary embodiment of the present disclosure; Figure 2Schematic diagram of the local state of the front end of the surgical instrument provided in the exemplary embodiment of the present disclosure Figure 1 ; Figure 3 Schematic diagram of the local state of the front end of the surgical instrument provided in the exemplary embodiment of the present disclosure Figure 2 ; Figure 4 Schematic diagram of the local state of the front end of the surgical instrument provided in the exemplary embodiment of the present disclosure Figure 3 ; Figure 5 Schematic diagram of the local structure of the catheter provided in the exemplary embodiment of the present disclosure; Figure 6 Schematic diagram of the internal inflation state of the catheter provided in the exemplary embodiment of the present disclosure Figure 1 ; Figure 7 is Figure 6 The enlarged view of part A in Figure 8 Schematic diagram of the internal inflation state of the catheter provided in the exemplary embodiment of the present disclosure Figure 2 .

[0021] Explanation of reference numerals: 1. Handle part; 11. Catheter; 12. Electrocoagulation bipolar dissection cutter head; 13. Flushing and suction tube; 14. Flexible endoscope; 2. Preliminary fixing mechanism; 21. First instrument inlet; 22. First inflatable tube; 23. First airbag; 3. Plugging and hemostasis mechanism; 31. Second instrument inlet; 32. Second inflatable tube; 33. Second inflating assembly; 331. Plugging airbag; 332. Abutting airbag; 34. Pressing and releasing assembly; 341. Annular guiding tube; 341a. Pressing area; 341b. Displacement area; 341c. Air pressure hole; 342. Sealing sliding ring; 343. Moving plugging member; 3431. Moving rod; 3432. Rubber piston; 344. Elastic part; 35. Storage tube body; 351. Release port; 352. Agent storage chamber; 353. Air pressure chamber; 4. Sealing and pushing ring; 5. Rubber ring. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0023] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0024] In the embodiments of this application, "proximal end" and "distal end" refer to the relative positions of each component to the user in the usage environment. Among them, 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".

[0025] This application provides a minimally invasive surgical instrument for pituitary tumors with a flexible nasal endoscope. Please refer to Figures 1 to 7 .

[0026] A minimally invasive surgical instrument for pituitary tumors with a flexible nasal endoscope, in combination with Figures 1 to 4 , which includes a handle part 1, a catheter 11, an electrocoagulation bipolar dissection blade 12, a flexible endoscope 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 dissection blade 12, the flexible endoscope 14, and the flushing and suction tube 13 are all movably arranged inside the catheter 11 and can extend from the distal port of the catheter 11 for observing, grasping, and aspirating gliomas at the lesion site under the guidance of the image of the flexible endoscope 14.

[0027] Exemplarily, a lens control knob is provided on the handle part 1. The lens control knob is connected to the flexible endoscope 14 for controlling the position of the flexible endoscope 14 inside the catheter 11. At the same time, a bipolar forceps opening and closing knob is also provided on the handle part 1. The bipolar forceps opening and closing knob is connected to the electrocoagulation bipolar dissection blade 12 for controlling the position of the electrocoagulation bipolar dissection blade 12 inside the catheter 11.

[0028] Exemplarily, in combination with Figure 1 , Figure 4, a preliminary fixing mechanism 2 is provided on the outer wall of the catheter 11, which is used to form a certain degree of support and friction with the inner wall of the duct after the catheter 11 passes through the nasal cavity opening and enters the duct, so that the catheter 11 maintains a relatively stable state during the operation, which is beneficial to reducing the shaking of the catheter 11 when the electrocoagulation bipolar dissection cutter head 12 extends for the operation of clamping the lesion, thereby reducing the mechanical interference to the inner wall of the duct and reducing the discomfort and tissue trauma of the patient during the operation. The preliminary fixing mechanism 2 can adopt forms such as an elastic support structure, a deployable anchor or an adjustable expansion ring, etc., and its fixing effect can be matched and adapted to a certain extent according to the actual shape of the duct, without relying on the complete regularity of the duct structure, and is applicable to most cases where the patient has a good constitution and the nasal cavity tissue has good elasticity.

[0029] Furthermore, in order to meet the surgical needs of some patients with severe trauma, easy bleeding and the need for additional treatment at the edge of the nasal cavity duct caused by physical differences, the present invention also provides a plugging and hemostasis mechanism 3 on the catheter 11. The plugging and hemostasis mechanism 3 is provided on the outer wall of the catheter 11 and is located at a position close to the front end of the catheter 11, which is used to locally plug the duct segment near the lesion side of the duct after the catheter 11 enters the duct and is positioned, and at the same time, a hemostatic agent is directionally released to this area in the plugged state. The plugging and hemostasis mechanism 3 can be realized by means such as an inflatable balloon, an expandable structure or a fluid expansion type closure, etc. The form of releasing the hemostatic agent can be realized by releasing through micropores, coating with a biodegradable material, pressurized release, etc. to achieve directional hemostasis treatment of this area. By setting the plugging and hemostasis mechanism 3, the problems of time delay and incomplete tissue treatment during the artificial hemostasis process can be avoided to a certain extent, thereby improving the overall surgical efficiency and reducing the intraoperative risk. It should be noted that the preliminary fixing mechanism 2 and the plugging and hemostasis mechanism 3 are two independent structural units, which are not connected in structure and can also be independently enabled in function, so that the instrument can flexibly select which mechanism to use according to the actual situation of the patient, thereby improving the adaptability and flexibility of the instrument in actual clinical applications.

[0030] The "fixation of the catheter 11" mentioned in this embodiment refers to making the degree of shaking of the catheter 11 within a controllable range during the operation through means such as friction, support, or plugging, rather than the catheter 11 being completely stationary. The "channel" refers to a passage opened in the nasal cavity for inserting the catheter 11 and surgical instruments and communicating with the lesion site, including the bone opening section and the soft tissue section at the connection between it and the nasal tissue. "Releasing a hemostatic agent" refers to delivering a substance with hemostatic function to the target area in a targeted manner, and its release method can be slow release, rapid diffusion, external coating coverage, etc., and the specific implementation can be adapted according to the type of hemostatic agent. To sum up, the structure provided by this embodiment can achieve stable support for the insertion of the catheter 11 and necessary hemostasis treatment under different patient conditions by reasonably configuring the preliminary fixation mechanism 2 and the plugging and hemostasis mechanism 3, which is beneficial to improving the safety, efficiency, and adaptability during the operation.

[0031] In some embodiments, in combination with Figure 1 , Figure 5 , Figure 6 and Figure 8 , the preliminary fixation mechanism 2 includes a first instrument inlet 21, a first inflatable tube 22, and a first airbag 23. The first instrument inlet 21 is arranged on the external structure of the catheter 11 and communicates with the inside of the catheter 11. At the same time, the first instrument inlet 21 is used to connect with an external inflating device to provide a gas source for the inflation of the internal airbag. The first inflatable tube 22 is arranged in the internal space of the catheter 11 along the extension direction of the catheter 11. One end of the first inflatable tube 22 communicates with the first instrument inlet 21, and the other end communicates with the first airbag 23 arranged on the outer wall of the catheter 11. The first airbag 23 is arranged on the outer wall surface of the catheter 11 near the distal opening, and its position is close to the deep area where the catheter 11 extends into the channel. During actual use, when the catheter 11 is inserted into the channel through the nasal cavity opening and advanced to the position required for the operation, the external inflating device can pressurize the inside of the first inflatable tube 22 through the first instrument inlet 21, and the gas is transported along the first inflatable tube 22 to the first airbag 23, causing the first airbag 23 to inflate. The inflated first airbag 23 can expand in the radial direction and form a circumferential abutting fit with the inner wall of the channel, thereby stabilizing the catheter 11 in the channel, restricting its shaking, and at the same time reducing the leakage of cerebrospinal fluid from the channel. This structure is beneficial to maintaining the overall stability of the catheter 11 when the bipolar electrocoagulation dissection blade 12 performs clamping operations or the flexible endoscope 14 adjusts the viewing angle, reducing the contact between the catheter 11 and the inner wall of the channel due to the shaking of the catheter 11, and helping to reduce the risk of intraoperative discomfort and tissue damage to the patient.

[0032] In this embodiment, "circumferential abutting fit" means that when the first airbag 23 is in an inflated state, its outer surface forms a fitting or supporting state with the inner wall of the channel in multiple directions around the catheter 11, so as to realize the radial limit of the catheter 11 and improve the stability. The "first airbag 23" does not specifically refer to an airbag of a certain fixed shape or material, and can be made of a 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 the preliminary fixing mechanism 2 can realize the positioning and limiting functions of the catheter 11 body on the premise of not affecting the normal extension and operation of the instruments at the front end of the catheter 11 (such as the electrocoagulation bipolar dissection knife head 12, the flexible endoscope 14, and the irrigation and aspiration tube 13), improve the stable operability of the instruments during the operation, and has positive significance for improving the operation efficiency and reducing the intraoperative risks.

[0033] In some examples, in combination with Figure 1 、 Figure 5 、 Figure 6 and Figure 8 , the hemostatic plugging mechanism 3 includes a second instrument inlet 31, a second inflatable tube 32, a second inflating assembly 33, a pressurizing and releasing assembly 34, and a storage tube body 35. The second instrument inlet 31 is communicatively arranged outside the catheter 11 and is connected to the second inflatable tube 32 inside the catheter 11, and is used to connect an external inflating device, so as to provide gas power for the operation of the hemostatic plugging mechanism 3.

[0034] The second inflatable 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 inflatable tube 32 is communicated with the second instrument inlet 31, and the other end is communicated with the second inflating assembly 33 arranged outside the catheter 11. The second inflating assembly 33 is arranged near the distal end of the catheter 11 and can expand when external gas enters, and expands in the radial direction to form a fitting state with the inner wall of the hole section of the channel near the lesion side, so as to play a dual role of plugging the hole section and fixing the catheter 11 to a certain extent. Here, "plugging" means partially or relatively completely filling the channel space through an inflatable structure to limit the spread of local bleeding, and "fixing the catheter 11" means restricting the axial and radial displacement of the catheter 11 through contact with the inner wall of the channel.

[0035] Meanwhile, a pressure release assembly 34 is provided on the catheter 11, and a storage tube 35 is provided on the pressure release assembly 34 and is used to carry a liquid or gel-like hemostatic agent. The storage tube 35 has a release port 351, and the storage tube 35 is used for the release port 351 to be sealed by the pressure release assembly 34 in the initial state to prevent the premature escape of the hemostatic agent. The pressure release assembly 34 is connected to the second inflatable tube 32, and the pressure release assembly 34 has a switchable first state and second state. In the first state, the pressure release assembly 34 blocks the release port 351 of the storage tube 35; when an external inflation device inflates the second instrument inlet 31 with gas, as the pressure in the second inflatable tube 32 rises, the gas pushes the pressure release assembly 34 to move and enter the second state, thereby opening the release port 351 of the storage tube 35, enabling the hemostatic agent to be released to the outside of the catheter 11 and distributed along the catheter 11 wall in the hole section near the lesion side of the hole, so as to achieve the effect of local rapid hemostasis.

[0036] After being set like this, through the synergistic effect with the second inflation assembly 33, this structure can also play a role in fixing the catheter 11 while performing hemostasis, thereby reducing local friction or further bleeding caused by the shaking of the catheter 11. For patients with weak constitutions, fragile tissues, or a high risk of intraoperative bleeding, it is beneficial to improve the hemostasis efficiency and shorten the time required for hemostasis. At the same time, the pressure release assembly 34 remains stationary in the non-ventilated state, which is conducive to the long-term storage of the hemostatic agent and avoids preoperative leakage or contamination.

[0037] It should be noted that the specific form of the "second inflation assembly 33" in this embodiment can be an annular airbag or multiple distributed expansion cavities, and the material can be selected from medical silicone or other biocompatible elastic materials. In summary, on the basis of meeting rapid hemostasis, this plugging and hemostasis mechanism 3 also has the function of stabilizing the catheter 11, which has a positive effect on improving the safety and efficiency of the overall surgical operation.

[0038] In some examples, in combination with Figure 1 、 Figure 5 、 Figure 6 and Figure 8, the second inflation assembly 33 specifically includes a blocking airbag 331 and a butting airbag 332, which are arranged at intervals on the outer wall of the catheter 11 and are sequentially communicated with the second inflation tube 32 along its inflation direction. The blocking airbag 331 is arranged on the catheter 11 and is located on the distal side 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 duct. The butting airbag 332 is arranged on the catheter 11 and is located on the proximal side of the first airbag 23. Its function is to abut against the inner wall of the duct in the circumferential direction to limit the axial movement of the catheter 11, so as to achieve the preliminary positioning and stability of the catheter 11 to a certain extent. There is an axial interval between the two to ensure that the effective deployment of the butting airbag 332 is not affected while the blocking airbag 331 expands.

[0039] Exemplarily, the radial length of the blocking airbag 331 is designed to be greater than the inner diameter of the duct; further, the radial length of the blocking airbag 331 refers to the length of the blocking airbag 331 in the inflated state plus the outer diameter of the catheter 11. The purpose is to effectively seal the opening connecting the duct and the lesion when it is in the inflated state, so that the hemostatic agent stays in the blocking area, thereby concentrating on the tissues near the lesion and achieving a good hemostatic effect. The size of the butting airbag 332 is set to adapt to the shape of the duct and can effectively fit with the inner wall of the duct in the inflated state, which is beneficial to further stabilizing the catheter 11 and avoiding the deviation of the catheter 11 during the operation due to operation or slight movement of the patient. In addition, the relative arrangement of the blocking airbag 331 and the butting airbag 332 can effectively "clamp" the duct section in the lesion area and form a relatively airtight structural space.

[0040] On this basis, when both the blocking airbag 331 and the butting airbag 332 are inflated at the same time and the blocking airbag 331 closes the opening connecting the duct and the nasal cavity, the duct section near the lesion side of the duct constitutes a partitioned duct section, that is, this duct section is between the relatively closed structures formed by the two inflation assemblies at both ends, so as to effectively limit the axial overflow of the hemostatic agent along the catheter 11 to the non-target area. This structural design is beneficial to improving the local residence time and action concentration of the hemostatic agent to a certain extent, thereby enhancing the hemostatic effect. At the same time, the setting of the partitioned duct section also provides a structural basis for judging the hemostatic effect after the operation, subsequent flushing or tissue protection. It should be noted that the "partitioned duct section" in this application refers to the area delimited by the space isolation structure generated by the inflation assembly, and small leaks or tissue gaps may exist locally. Therefore, the "sealing" of this structure should be understood as functional sealing, that is, sufficient to achieve the purpose of local drug retention and catheter 11 stability, rather than absolute sealing in the physical sense. In summary, the setting of the blocking airbag 331 and the butting airbag 332 is beneficial to forming a locally controllable sealed environment after the catheter 11 is inserted, improving the use efficiency of the hemostatic agent and assisting in the stability of the catheter 11, and has positive technical value for the accuracy and safety of minimally invasive surgery.

[0041] Further, when both the plugging airbag 331 and the abutting airbag 332 are inflated simultaneously and the plugging airbag 331 closes the opening where the duct communicates with the nasal cavity, the partition hole section for loading the hemostatic agent has been formed at this time. The external inflation device can be activated to extract the gas in the first airbag 23, so that the first airbag 23 deflates to create a space for the hemostatic agent to stay.

[0042] Exemplarily, the storage tube body 35 is arranged between the plugging 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 duct. It should be noted that the radial length of the storage tube body 35 here refers to the radial length of the storage tube body 35 plus the catheter 11, that is, this radial length includes the outer diameter of the catheter 11. In this way, after the storage tube body 35 is loaded with the hemostatic agent, it is not easy to block the duct.

[0043] In some embodiments, combined with Figure 1 、 Figure 5 、 Figure 6 and Figure 8 , the pressure release assembly 34 specifically includes an annular guiding tube 341, a sealing sliding ring 342, a moving plugging member 343 and an elastic part 344. Each component cooperates with each other to achieve the controlled release of the hemostatic agent from the storage tube body 35. The annular guiding tube 341 is a hollow annular structure, fixedly arranged on the outer peripheral wall of the catheter 11, and the storage tube body 35 is circumferentially arranged on the outer peripheral wall of the annular guiding tube 341, arranged coaxially. At the same time, one end of the annular guiding tube 341 is a closed structure and the other end is an open structure, which is used to provide the movement direction and range of the moving plugging member 343.

[0044] Further, the sealing sliding ring 342 is a ring structure, which can be slidably arranged along the axial direction of the annular guiding tube 341, and divides the internal space of the annular guiding tube 341 into a partitioned pressurized area 341a and a displacement area 341b. Among them, the pressurized area 341a is communicated with the second inflatable tube 32 in an airtight manner, and gas can be input here through the second inflatable tube 32 to generate a thrust, while the sealing sliding ring 342 is slidably arranged in the displacement area 341b, that is, the displacement area 341b provides the required moving space for the sealing sliding ring 342.

[0045] Furthermore, the movable plugging member 343 is fixed to the sealing sliding ring 342. A part of the movable plugging member 343 is disposed on the surface of the sealing sliding ring 342 facing the displacement area 341b and is directly opposite to the open end of the annular guiding tube 341; while the other part of the movable plugging member 343 is used to plug the release port 351 of the storage tube body 35. When the sealing sliding ring 342 moves under the action of a thrust force, a part of the movable plugging member 343 moves forward along with it and extends out from the open end, realizing the pushing action on the other part of the movable plugging member 343, so as to move the other part of the movable plugging member 343 away from the release port 351 of the storage tube body 35, exposing the release port 351 of the storage tube body 35. The elastic part 344 is disposed in the pressurizing area 341a, between the sealing sliding ring 342 and the closed end of the annular guiding tube 341, and functions to push the sealing sliding ring 342 back. It always maintains a tendency to rebound towards the displacement area 341b when there is no external force, which is beneficial to retracting the movable plugging member 343 into the annular guiding tube 341 to avoid mechanical damage to the inner wall of the duct or surrounding tissues in the postoperative stage.

[0046] It should be noted that the volumes of the pressurizing area 341a and the displacement area 341b are relative, that is, when the volume of the pressurizing area 341a increases, the volume of the displacement area 341b decreases, and when the volume of the pressurizing area 341a decreases, the volume of the displacement area 341b increases. The relative change in the volumes of the pressurizing area 341a and the displacement area 341b is judged instantaneously based on the current position of the sealing sliding ring 342.

[0047] From the perspective of the cooperation between the structure and the function, the design of the pressurizing and releasing assembly 34 has a certain sequential response characteristic. Due to the presence of the sealing sliding ring 342, when the second inflatable tube 32 is initially inflated with gas, the gas first inflates the abutting airbag 332 and the plugging airbag 331. Only when both of these airbags reach the inflated state and the gas capacity of the system is limited, the continuously input external gas pressure will start to act on the sealing sliding ring 342, and then drive it to move forward, so that the movable plugging member 343 extends out from the annular guiding tube 341 and opens the release port 351 of the storage tube body 35 to facilitate the release of the hemostatic agent. This sequential response characteristic is beneficial to improving the stability of surgical control to a certain extent. Even if there are operation errors 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.

[0048] In addition, the movable plugging member 343 can be passively retracted into the annular guiding tube 341 under the pushing action of the elastic part 344, which is beneficial to avoiding continuous contact or abrasion with the inner wall of the duct in the postoperative stage, and is also conducive to providing a safer operation environment for the subsequent possible extraction of the catheter 11 or secondary surgery. In this embodiment, terms such as "movable plugging member 343", "pressurizing area 341a", "displacement area 341b", "elastic part 344", etc. should be understood as structural parts with specific functional distinctions, and their boundaries and definitions should be limited 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. With the above structural design, the pressurizing and releasing assembly 34 improves the responsiveness and controllability of hemostatic agent release to a certain extent, and takes into account the intraoperative safety and the need for postoperative tissue protection, and has good application prospects.

[0049] Exemplarily, the elastic part 344 is configured as a spring. An annular fixing piece is provided in the displacement area 341b. An annular hole is formed through the annular fixing piece. One end of the spring is connected to the sealing sliding ring 342, and the other end is connected to the annular fixing piece, and the gas can flow normally through the annular hole.

[0050] In some embodiments, in combination with Figure 6 , Figure 7 and Figure 8 , the movable plugging 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 facing away from the elastic part 344. The second end of the movable rod 3431 axially extends out from the opening of the annular guiding tube 341. The rubber piston 3432 is arranged 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 pressurizing and releasing assembly 34 is in the first state, the rubber piston 3432 blocks the release port 351 of the storage tube body 35; when the pressurizing and releasing assembly 34 is in the second state, the rubber piston 3432 is away from the release port 351 of the storage tube body 35.

[0051] With such a setting, by axially moving the moving rod 3431 within the displacement region 341b of the annular guiding tube 341, it is possible to drive the rubber piston 3432 to block or release the release port 351 for switching. When the gas in the second charging tube 32 enters the pressurized region 341a, the gas in the pressurized region 341a will generate a thrust acting on the sealing sliding ring 342, causing the sealing sliding ring 342 to drive the moving rod 3431 to axially move towards the open end within the annular guiding tube 341, so that the moving rod 3431 drives the rubber piston 3432 to disengage from the release port 351. At this time, the hemostatic agent in the storage tube body 35 can flow out of the storage tube body 35 through the release port 351. When the second charging tube 32 no longer fills the gas into the pressurized region 341a, under the elastic force of the elastic part 344, it will drive the sealing sliding ring 342 to axially move away from the open side of the annular guiding tube 341 within the displacement region 341b, thereby driving the moving rod 3431 to retract again, and finally causing the rubber piston 3432 to block the release port 351 again. It should be noted that since the hemostatic agent in the storage tube body 35 has flowed out, whether the rubber piston 3432 blocks the release port 351 is no longer important, that is, if under the rebound action of the elastic part 344, the rubber piston 3432 can no longer be hermetically fitted in the release port 351 as in the initial state, it does not affect the normal use of this application at this time.

[0052] In some embodiments, in combination with Figure 6 , Figure 7 and Figure 8 , a sealing push ring 4 is slidably arranged in the storage tube body 35. The sealing push ring 4 seals and divides the internal space of the storage tube body 35 into a pneumatic cavity 353 and a storage agent cavity 352. The storage agent cavity 352 communicates with the release port 351. A pneumatic hole 341c is penetrated through the tube wall of the annular guiding tube 341, and the pneumatic hole 341c communicates with the pneumatic cavity 353. Among them, when the pressurization and release assembly 34 is in the first state, the sealing sliding ring 342 blocks the pneumatic hole 341c to disconnect the pneumatic cavity 353 from the pressurized region 341a. When the pressurization and release assembly 34 switches from the first state to the second state, the sealing sliding ring 342 moves away from the pneumatic hole 341c to communicate the pneumatic cavity 353 with the pressurized region 341a through the pneumatic hole 341c.

[0053] It can be understood that when the pressure release assembly 34 is in the first state, the second charging pipe 32 has not yet filled the pressurized area 341a with gas. The sealing sliding ring 342 is in a static state under the action of the elastic part 344. At this time, the sealing sliding ring 342 will block the air pressure hole 341c, so that the air pressure chamber 353 and the pressurized area 341a are in a disconnected state. When the pressure release assembly 34 switches from the first state to the second state, the second charging pipe 32 will continuously fill the pressurized area 341a with gas. Under the pushing action of the gas, it will drive the sealing sliding ring 342 to axially move away from the opening side of the annular guiding pipe 341 in the displacement area 341b. At this time, the sealing sliding ring 342 will move away from the air pressure hole 341c, and the pressurized area 341a can be directly communicated with the air pressure hole 341c. At this time, the gas in the pressurized area 341a will enter the air pressure chamber 353 through the air pressure hole 341c, increasing the gas in the air pressure chamber 353. Furthermore, it can then push the sealing push ring 4 to move in the storage tube body 35. Finally, through the sealing push ring 4, the hemostatic agent in the storage agent chamber 352 is actively pushed out of the storage tube body 35 from the release port 351. After such a setting, it can help the hemostatic agent in the storage agent chamber 352 to move out more smoothly, and can also effectively avoid the situation that too much residue of the hemostatic agent in the storage agent chamber 352 causes waste or fails to achieve the hemostatic effect.

[0054] In some embodiments, in combination with Figure 1 、 Figure 5 、 Figure 6 and Figure 7 , to further limit the movement range of the moving plugging member 343 and prevent the moving plugging member 343 from continuing to move 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 the contact between the moving plugging member 343 and the abutting airbag 332. When the second charging pipe 32 continuously fills the displacement area 341b with gas, causing the sealing sliding ring 342 to drive the moving plugging member 343 to axially move, the moving plugging member 343 will approach the rubber ring 5. The material of the rubber ring 5 is set as a medical rubber material with certain elasticity and buffering performance. It can produce slight deformation after the moving plugging member 343 contacts it, so as to absorb the remaining kinetic energy of the moving plugging member 343, which is beneficial to limiting the moving plugging member 343 from continuing to move forward and contacting the abutting airbag 332. The design of this structure can not only reduce the excessive extension of the moving plugging member 343 caused by inertia or air pressure change to a certain extent, but also has the function of passively limiting the position of the moving plugging member 343, thereby reducing the risk of accidental damage to other functional components of the catheter 11, especially other abutting airbags 332.

[0055] Furthermore, as a mechanical blocking element, the rubber ring 5 has a physical contact braking mechanism, with advantages such as simple structure, high control precision, and easy processing, which helps to improve the safety and controllability of this instrument in minimally invasive operations. At the same time, the action of contacting the rubber ring 5 can also be regarded as the termination displacement signal after the movable plugging member 343 has completed an effective movement, which is beneficial for doctors to judge the action state of the instrument during the operation and make an early response to stop the gas supply. This structural layout reflects the careful consideration of the safety of minimally invasive surgery and has more clinical application value especially in the transnasal approach where the space is limited and the tissue is fragile.

[0056] In the description of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0057] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0058] In the embodiments, implementation manners and related technical features of this application, they can be combined and replaced with each other without conflict.

[0059] The above are only the preferred embodiments of this application and do not impose any form of limitation on this application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application still fall within the scope of the technical solution of this application.

Claims

1. A minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope, characterized in that, It includes a handle part (1), a catheter (11), an electrocoagulation bipolar dissection cutter head (12), a flexible endoscope (14) and a flushing and suction tube (13). The catheter (11) is arranged at the front end position of the handle part (1). The electrocoagulation bipolar dissection cutter head (12), the flexible endoscope (14) and the electrocoagulation bipolar dissection cutter head (12) are all movably arranged in the catheter (11) and can extend out from the distal port of the catheter (11). It further includes: A preliminary fixing mechanism (2) which is arranged on the catheter (11) and is used for fixing the catheter (11) on the inner wall of the duct after the catheter (11) extends into the duct. A plugging and hemostasis mechanism (3) which is arranged on the catheter (11) and is used for plugging the duct segment near the lesion side of the duct while fixing the catheter (11) after the catheter (11) extends into the duct, and releasing a hemostatic agent in this duct segment. Wherein, The preliminary fixing mechanism (2) and the plugging and hemostasis mechanism (3) are independent of each other and not communicated with each other.

2. The minimally invasive surgical instrument for pituitary tumor with a flexible nasal endoscope according to claim 1, wherein The preliminary fixing mechanism (2) includes a first instrument inlet (21), a first inflatable tube (22) and a first airbag (23). Wherein, The first instrument inlet (21) is communicatively arranged on the catheter (11) and is used for connecting with an external inflating device. The first inflatable tube (22) is arranged in the catheter (11) along the extending direction of the catheter (11), and one end of the first inflatable tube (22) is communicated with 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 communicated with the other end of the first inflatable tube (22). When the first airbag (23) is in an inflated state, the first airbag (23) is circumferentially abutted and cooperated with the inner wall of the duct.

3. The minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 2, wherein, The plugging and hemostasis mechanism (3) includes a second instrument inlet (31), a second inflatable tube (32), a second inflating assembly (33), a pressurizing and releasing assembly (34) and a storage tube body (35); Wherein, The second instrument inlet (31) is communicatively arranged on the catheter (11) and is used for connecting with an external inflating device. The second inflatable tube (32) is arranged in the catheter (11) along the extending direction of the catheter (11), and one end of the second inflatable tube (32) is communicated with the second instrument inlet (31). The second inflating assembly (33) is arranged on the catheter (11) and is communicated with the second inflatable tube (32), and is used for expanding and plugging the duct segment near the lesion side of the duct and fixing the catheter (11) when an external inflating device inflates gas. The pressure release assembly (34) is provided on the catheter (11). The storage tube body (35) is provided on the pressure release assembly (34) and is used for storing a hemostatic agent. The storage tube body (35) has a release port (351). The pressure release assembly (34) is communicated with the second inflatable tube (32). The pressure release assembly (34) has a switchable first state and second state. Wherein, when the external inflating device stops inflating gas into the second instrument inlet (31), the pressure release assembly (34) is in the first state and blocks the release port (351) of the storage tube body (35); when the external inflating device inflates gas into the second instrument inlet (31), the pressure release assembly (34) is switched from the first state to the second state under the pushing action of the gas, and in this process, the release port (351) of the storage tube body (35) is opened, so that the hemostatic agent overflows into the hole section near the lesion side of the hole through the release port (351).

4. The minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 3, characterized in that, The second inflating assembly (33) includes a blocking airbag (331) and a fitting airbag (332), wherein, The blocking airbag (331) is provided on the catheter (11) and is located on the side closer to the distal end of the first airbag (23). The fitting airbag (332) is provided on the catheter (11) and is located on the side closer to the proximal end of the first airbag (23). The second inflatable tube (32) is sequentially communicated with the blocking airbag (331) and the fitting airbag (332) along the inflating 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 hole, so that the blocking airbag (331) can block the opening where the hole communicates with the lesion in the inflated state; When the fitting airbag (332) is in an inflated state, the fitting airbag (332) is in circumferential abutting fit with the inner wall of the hole.

5. The minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 4, characterized in that, The blocking airbag (331) and the fitting airbag (332) are configured such that when both are in an inflated state and the blocking airbag (331) blocks the opening where the hole communicates with the nasal cavity, a partition hole section is formed in the hole section near the lesion side of the hole to limit the outflow of the hemostatic agent from the hole section near the lesion side of the hole.

6. The minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 3, wherein, The storage tube body (35) is provided between the blocking airbag (331) and the fitting airbag (332), and the radial length of the storage tube body (35) is less than the inner diameter of the hole; 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).

7. A minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 4, characterized in that, The pressurized release assembly (34) comprises 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 slidably arranged in the annular guide tube (341); and the internal space of the annular guide tube (341) is divided into a separated pressurized area (341a) and a pressurized area (341b) by the sealing sliding ring (342). The displacement area (341b), the pressurized area (341a) is sealed and connected with the second inflation tube (32), the movable blocking member (343) is configured such that a part of it is axially slidable in the displacement area (341b), and the other part is used to block the release port (351) of the storage tube body (35), the elastic part (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 part (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 gas into the pressurized area (341a), 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 the tube opening at one end of the annular guide tube (341) and the storage tube body (35) to open the release port (351) of the storage tube body (35), and 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 enables the movable blocking member (343) to re-block the release port (351) of the storage tube body (35). At this time, the pressurized release assembly (34) is in the first state.

8. A minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 7, characterized in that, 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) 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 arranged 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 pressure 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 pressure release assembly (34) is in the second state, the rubber piston (3432) moves away from the release port (351) of the storage tube body (35).

9. The minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 7, characterized in that, A sealing push ring (4) is slidably arranged in the storage tube body (35). The sealing push ring (4) seals and divides the inner space of the storage tube body (35) into a pneumatic cavity (353) and a reagent storage cavity (352). The reagent storage cavity (352) communicates with the release port (351). An air pressure hole (341c) is formed through the tube wall of the annular guide tube (341), and the air pressure hole (341c) communicates with the pneumatic cavity (353); wherein, When the pressure release assembly (34) is in the first state, the sealing sliding ring (342) blocks the air pressure hole (341c) to disconnect the pneumatic cavity (353) from the pressurized area (341a); During the process of the pressure release assembly (34) switching from the first state to the second state, the sealing sliding ring (342) moves away from the air pressure hole (341c) to communicate the pneumatic cavity (353) with the pressurized area (341a) through the air pressure hole (341c).

10. The minimally invasive surgical instrument for pituitary tumors using a flexible nasal endoscope according to claim 9, characterized in that, A rubber ring (5) is arranged on the outer wall of the conduit (11). 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 plugging member (343) and the abutting airbag (332).

Images