Medical devices and guide tubes

Abstract

The present application belongs to the field of medical device technology, and specifically relates to a medical device and a guide tube. The distal tube mouth of the guide tube is folded toward the inside of the guide tube to form an inverted portion, and a first flow channel is formed between the inverted portion and the inner wall of other parts of the guide tube. The inverted portion is configured to expand toward the outside of the distal end of the guide tube when a fluid with a pressure exceeding a first preset value is introduced into the first flow channel; when all parts of the inverted portion are in an expanded state, the distal tube mouth of the guide tube is in a conducting state. When a fluid is introduced into the first flow channel of the present embodiment, the inverted portion will gradually turn over and expand toward the outside of the guide tube. During this process, the inverted portion has a radial outward sub-movement. In this way, when the guide tube is aimed at a narrow or closed target cavity, the radial sub-movement will drive the inner wall of the target cavity to move in a radial outward direction, thereby expanding the target cavity and facilitating the inverted portion after expansion to enter the target cavity.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and specifically relates to a medical device and a guide tube. Background Art

[0002] In the process of diagnosing and treating patients with endoscopes, it is usually necessary to insert a guide tube into the patient's body cavity. In order to facilitate the guide tube to enter the target body cavity, the surgeon can operate the guide tube by manual rotation, swinging, linear propulsion, and reciprocating movement to reduce the resistance exerted by the target body cavity on the guide tube. However, in practice, when the surgeon encounters a narrow or closed target body cavity, it is not easy to insert the guide tube into the target body cavity even if the guide tube is operated by manual rotation, swinging, linear propulsion, and reciprocating movement. Summary of the invention

[0003] The purpose of the present application is to provide a medical device and a guide tube, which can solve the current problem that it is difficult to insert the guide tube into the target body cavity.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, the present application provides a guide tube for entering a body cavity, wherein a distal tube opening of the guide tube is folded toward the inside of the guide tube to form an inverted portion, a first flow channel is formed between the inverted portion and the inner wall of other parts of the guide tube, and the inverted portion is configured to expand toward the outside of the distal end of the guide tube when a fluid having a pressure exceeding a first preset value is introduced into the first flow channel;

[0006] When all parts of the inverted portion are in the expanded state, the distal tube opening of the guide tube is in the conducting state.

[0007] In a second aspect, the present application provides a medical device including the above-mentioned guide tube.

[0008] The beneficial technical effects of this application are as follows:

[0009] In the present application, the distal tube opening of the guide tube is folded inwardly toward the guide tube to form an inverted portion, and a first flow channel is formed between the inverted portion and the inner wall of the other parts of the guide tube. Fluid can be injected into the first flow channel through the proximal tube opening of the guide tube, so that the inverted portion is gradually turned over and unfolded toward the outside of the guide tube. During this process, the length of the guide tube will gradually increase, and after the inverted portion is turned over and unfolded outwardly, the inverted portion will return to its shape before the inversion, that is, the inverted portion located within the other parts of the guide tube will unfold outward. During this process, the inverted portion has a radial outward sub-movement. In this way, when the guide tube is aimed at a narrow or closed target cavity, the radial sub-movement will drive the inner wall of the target cavity to move in a radial outward direction, thereby expanding the target cavity and facilitating the inverted portion after unfolding to enter the target cavity.

[0010] In addition, the inverted portion of the present application is turned outward and expanded to allow the guide tube to extend in a preset direction. That is, after fluid is introduced into the guide tube, the extension direction of the guide tube is certain. In this way, after the guide tube is aligned with the target body cavity, the guide tube can be precisely controlled to enter the target body cavity, and it will not deviate from the target body cavity due to poor maneuverability as in the prior art.

[0011] Furthermore, the present application can control the pressure of the fluid entering the guide tube and thus the pressure entering the first flow channel, which can control the force of the inverted portion pushing the target cavity when extended, which can prevent the guide tube from exerting a large force on the target cavity and damaging the target cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the guide tube disclosed in the embodiment of the present application;

[0013] Figure 2 A cross-sectional view of the guide tube disclosed in the embodiment of the present application;

[0014] Figure 3 is a cross-sectional view of a guide tube disclosed in another embodiment of the present application;

[0015] Figure 4 It is a schematic diagram of the structure of the guide tube after a part of the inverted portion disclosed in the embodiment of the present application is turned outward and unfolded;

[0016] Figure 5 A cross-sectional view of the guide tube after a portion of the inverted portion disclosed in the embodiment of the present application is turned outward and unfolded;

[0017] Figure 6 This is a schematic diagram of the structure of the guide tube after all parts of the inverted portion disclosed in the embodiment of the present application are turned outward and unfolded;

[0018] Figure 7 It is a cross-sectional view of the guide tube after all parts of the inverted portion disclosed in the embodiment of the present application are turned outward and unfolded;

[0019] Figure 8 It is a schematic diagram of the structure of the endoscope disclosed in the embodiment of the present application;

[0020] Fig. 9 For this application Figure 8 A magnified schematic diagram of center A.

[0021] Description of reference numerals:

[0022] 100, guide tube; 110, base tube section; 111, mounting groove; 120, introduction tube section; 121, connecting portion; 122, inverted portion; 1221, folded section; 1222, extension section; 123, unfolding portion; 200, first flow channel; 210, second flow channel; 220, third flow channel; 300, insertion portion; 310, instrument channel. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one 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 specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0025] The medical device and guide tube provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0026] In each embodiment of the present application, "proximal end" and "distal end" refer to the distance between the guide tube and its components and 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".

[0027] In the prior art, when inserting a guide tube into a target body cavity, the distal end of the guide tube is usually first aligned with the target cavity, and then the proximal end of the guide tube is manually pushed to allow the guide tube to enter the target body cavity. However, since the surgeon pushes the guide tube from its proximal end, the path for the pushing force to be transmitted to the distal end of the guide tube is long, which results in poor maneuverability of the guide tube, causing the guide tube to deviate from the preset insertion direction, which obviously makes it difficult to insert the guide tube into the target body cavity.

[0028] like Figures 1 to 7As shown, the embodiment of the present application discloses a guide tube 100 for entering a body cavity, wherein the distal tube opening of the guide tube 100 is folded toward the inside of the guide tube 100 to form an inverted portion 122, wherein the inverted portion 122 here is deformable, and also needs to have a certain rigidity after being unfolded, so as to prevent the inverted portion 122 from being crushed by the inner wall of the body cavity after being unfolded, for example, the inverted portion 122 can be made of an elastic material or a flexible material, and a first flow channel 200 is formed between the inverted portion 122 and the inner wall of the other parts of the guide tube 100. Specifically, the other parts of the guide tube 100 refer to the parts of the guide tube 100 other than the inverted portion 122; the first flow channel 200 here has one end closed and the other end open, the fold between the inverted portion 122 and the other parts of the guide tube 100 closes the first flow channel 200, and the end of the first flow channel 200 away from the above-mentioned fold (the proximal end of the first flow channel 200) is open.

[0029] The inverted portion 122 is configured to expand toward the outside of the distal end of the guide tube 100 when a fluid having a pressure exceeding a first preset value is introduced into the first flow channel 200. The fluid here can be gas or liquid. The first preset value can be selected according to actual conditions. The present application does not limit the specific value of the first preset value. Figure 5 After the fluid is passed into the first flow channel 200, it will impact the fold between the inverted portion 122 and the other parts of the guide tube 100, thereby driving the inverted portion 122 to turn outward and unfold. The direction of the turning and unfolding is as follows: Figure 5 It should be noted that after the inverted portion 122 is unfolded toward the outside of the distal end of the guide tube 100, the unfolded portion is in an unfolded state and no longer in an inverted state. Therefore, for the convenience of description, the present application defines the unfolded portion 123 as the inverted portion 122 that is turned over and unfolded toward the outside of the distal end of the guide tube 100. At this time, the other parts of the guide tube 100 include the unfolded portion 123, and the first flow channel 200 includes the channel formed between the inner wall of the unfolded portion 123 and the inverted portion 122.

[0030] When all parts of the inverted portion 122 are in the expanded state, the distal tube opening of the guide tube 100 is in the conducting state, so that the surgical instrument can pass through the distal tube opening of the guide tube 100 to enter the target body cavity, which can be the bile duct cavity. The nipple of the duodenal cavity is opened through the guide tube 100 of the present application to enter the bile duct cavity, and then the surgical instrument, such as a stone removal basket, can be inserted from the guide tube 100 to enter the bile duct cavity, so as to treat the stones in the bile duct cavity.

[0031] In the present application, the distal end of the guide tube 100 is folded inwardly toward the guide tube 100 to form an inverted portion 122, and a first flow channel 200 is formed between the inverted portion 122 and the inner wall of the other part of the guide tube 100. The fluid can be injected into the first flow channel 200 through the proximal end of the guide tube 100, so that the inverted portion 122 is gradually turned outward toward the outside of the guide tube 100. In this process, the length of the guide tube 100 will gradually increase, and the inverted portion 122 will turn inward after turning outward. The inverted portion 122 will return to its shape before inversion, that is, the inverted portion 122 located within the other parts of the guide tube 100 will expand outward. During this process, the inverted portion 122 has a radial outward component movement. In this way, when the guide tube 100 is aimed at a narrow or closed target cavity, the radial component movement will drive the inner wall of the target cavity to move radially outward, thereby expanding the target cavity and facilitating the inverted portion 122 (i.e., the expanded portion 123) after expansion to enter the target cavity.

[0032] In addition, the inverted portion 122 of the present application is turned outward and expanded to allow the guide tube 100 to extend in a preset direction. That is, after fluid is introduced into the guide tube 100, the extension direction of the guide tube 100 is certain. In this way, after the guide tube 100 is aligned with the target body cavity, the guide tube 100 can be precisely controlled to enter the target body cavity, and will not deviate from the target body cavity due to poor maneuverability as in the prior art.

[0033] Furthermore, the present application can control the pressure of the fluid entering the guide tube 100 and thus control the pressure entering the first flow channel 200, which can control the force of the inverted portion 122 pushing the target cavity when extended, which can prevent the guide tube 100 from exerting a large force on the target cavity and damaging the target cavity.

[0034] See also Figure 2 and Figure 3 In an optional embodiment, the inward-turned portion 122 includes a folded section 1221 and an extension section 1222, one end of the folded section 1221 is folded relative to other parts of the guide tube 100, the folded section 1221 here is the folded portion between the inward-turned portion 122 and other parts of the guide tube 100, the other end of the folded section 1221 is connected to the extension section 1222, and the extension section 1222 has a flat structure.

[0035] In the present embodiment, since the folded section 1221, the extension section 1222 and other parts of the guide tube 100 are enclosed to form the above-mentioned first flow channel 200, and the proximal end of the first flow channel 200 is open and the distal end of the first flow channel 200 is blocked by the folded section 1221, the distance between the extension section 1222 and the inner wall of the other parts of the guide tube 100 will determine the volume of the first flow channel 200. The larger the distance, the larger the volume of the first flow channel 200. In the present embodiment, the extension section 1222 is set to a flat structure, which can reduce the size of the fourth flow channel formed in the flat structure, so as to reduce the internal space of the other parts of the guide tube 100 occupied by the extension section 1222, so that the first flow channel 200 has a larger volume. When the volume of the first flow channel 200 increases, the flow rate of the fluid in the first flow channel 200 can be increased. Obviously, this can increase the contact area between the fluid and the folding section 1221, that is, increase the impact area of ​​the fluid on the folding section 1221, so that the inverted portion 122 can be turned outward more quickly to shorten the time for the guide tube 100 to enter the target body cavity; and when the flow rate of the fluid in the first flow channel 200 increases, it can also increase the impact force of the fluid on the folding section 1221, thereby increasing the radial outward component of the inverted portion 122 to better expand the target cavity. Of course, the extension section 1222 may not be a flat structure, and the fourth flow channel formed in the flat structure may have a larger size.

[0036] In an optional embodiment, along the thickness direction of the extension section 1222 ( Figure 2 In the direction indicated by the x-arrow line in the figure), the inner wall of the extension section 1222 includes a first part and a second part which are arranged opposite to each other, and the first part and the second part are in contact with each other. At this time, all parts of the extension portion along its own extension direction are in a flattened state, which can cut off the fourth flow channel formed in the inverted portion 122. Obviously, this can prevent the fluid in the first flow channel 200 from leaking out of the guide tube 100 through the fourth flow channel, thereby preventing the fluid in the first flow channel 200 from being depressurized, so as to ensure that the fluid pressure in the first flow channel 200 exceeds the first preset value, so that the inverted portion 122 can be stably unfolded.

[0037] Since the fourth flow channel in the extension section 1222 is located between the first part and the second part, and the first part and the second part of the inner wall of the extension section 1222 of this embodiment are in contact with each other, that is, the extension section 1222 is flattened, and the size of the fourth flow channel is minimized, so that the space occupied by the extension section 1222 in other parts of the guide tube 100 is minimized, and the distance between the extension section 1222 and the inner wall of other parts of the guide tube 100 is maximized, so as to further increase the volume of the first flow channel 200, shorten the time for the guide tube 100 to enter the target body cavity, and better expand the target cavity. Of course, the first part and the second part may not be in contact with each other, and in this case, a certain distance may be separated between the first part and the second part.

[0038] In order to prevent the fluid in the first flow channel 200 from entering the fourth flow channel formed in the inverted portion 122 and leaking out of the guide tube 100 through the fourth flow channel, in an optional embodiment, the free end of the inverted portion 122 away from the other parts of the guide tube 100 is in a flattened state to close the free end of the inverted portion 122. Specifically, when this embodiment is combined with the embodiment of "the inverted portion 122 includes a folded section 1221 and an extension section 1222", the free end of the inverted portion 122 refers to the end of the extension section 1222 away from the folded section 1221.

[0039] In this embodiment, when the free end of the inverted portion 122 is deflated, the tube wall of the free end of the inverted portion 122 collapses inward, so that the tube walls of the free end of the inverted portion 122 fit together, so as to cut off the fourth flow channel formed in the inverted portion 122, so that the free end of the inverted portion 122 is in a closed state, which can obviously prevent the fluid in the first flow channel 200 from leaking out of the guide tube 100 through the fourth flow channel, thereby preventing the fluid in the first flow channel 200 from being depressurized, so as to ensure that the fluid pressure in the first flow channel 200 exceeds the first preset value, so that the inverted portion 122 is stably expanded. Of course, the free end of the inverted portion 122 may not be in a deflated state, and this application is not limited to this.

[0040] In order to prevent the free end of the deflated inverted portion 122 from being flushed open under the action of a fluid with a first preset pressure value, so that the fourth flow channel in the inverted portion 122 is in an open state, in an optional embodiment, the free end of the inverted portion 122 is provided with a connecting structure. Exemplarily, the connecting structure can be an adhesive layer, such as an adhesive layer formed by glue or a double-sided tape. The connecting structure can also be a snap-on structure, a hot-melt layer, etc. The connecting structure is configured to maintain the deflated state of the free end of the inverted portion 122 when the fluid pressure in the first flow channel 200 is less than the second preset value, and to release the deflated state of the free end of the inverted portion 122 when the fluid pressure in the first flow channel 200 is greater than or equal to the second preset value, so as to connect the free end of the inverted portion 122, wherein the second preset value is greater than the first preset value. The second preset value here can be selected according to actual conditions, and the present application does not limit the specific value of the second preset value.

[0041] In this embodiment, when a fluid having a fluid pressure greater than the first preset value and less than the second preset value is introduced into the proximal end of the guide tube 100, the fluid will enter the first flow channel 200 to make the inverted portion 122 turn outward and unfold. Since the pressure of the fluid is less than the second preset value, the fluid cannot disconnect the connection structure, that is, the connection structure keeps the free end of the inverted portion 122 in a flattened state, so that the fourth flow channel is cut off, and in the process of the inverted portion 122 turning outward and unfolding, the fourth flow channel is always in a cut-off state, which can stably unfold the inverted portion 122. When only the folded part of the inverted portion 122 itself is not unfolded, a fluid having a fluid pressure greater than or equal to the second preset value can be introduced into the proximal end of the guide tube 100. At this time, the fluid can disconnect the connection structure, so that the free end of the inverted portion 122 is released from the flattened state to conduct the free end of the inverted portion 122, so that the surgical instrument can pass through the guide tube 100. Of course, the free end of the inverted portion 122 may not be provided with a connection structure, and this application is not limited to this.

[0042] Generally speaking, the inverted portion 122 has a relatively large length. Therefore, after the distal tube opening of the guide tube 100 is folded inward to form the inverted portion 122, if one wants to lengthen the length of the inverted portion 122, a clamping tool can be inserted from the proximal tube opening of the guide tube 100, and the inverted portion 122 can be clamped by the clamping tool and pulled toward the proximal tube opening of the guide tube 100, thereby lengthening the inverted portion 122. However, the guide tube 100 is relatively long, and the clamping tool needs to be inserted a relatively long distance to clamp the inverted portion 122, which is not convenient for lengthening the inverted portion 122.

[0043] To facilitate lengthening the inverted portion 122, in an optional embodiment, the guide tube 100 includes a base tube section 110 and an introduction tube section 120 that are separately arranged, the distal tube opening of the guide tube 100 is the distal tube opening of the introduction tube section 120, and the portion of the introduction tube section 120 other than the inverted portion 122 is a connecting portion 121. The introduction tube section 120 and the connecting portion 121 here both belong to other portions of the guide tube 100 described above, the connecting portion 121 is connected to the base tube section 110, and a second flow channel 210 is formed between the inverted portion 122 and the inner wall of the connecting portion 121, the first flow channel 200 includes the second flow channel 210, and the second flow channel 210 is connected to the internal flow channel of the base tube section 110. Specifically, at least part of the inverted portion 122 of the present embodiment is located in the connecting portion 121. When all parts of the inverted portion 122 are located in the connecting portion 121, the first flow channel 200 is the same as the second flow channel 210. When only a part of the inverted portion 122 is located in the connecting portion 121, the inverted portion 122 will pass through the proximal pipe opening of the connecting portion 121 and extend into the base tube segment 110. A third flow channel 220 is formed between the inverted portion 122 and the inner wall of the base tube segment 110. The first flow channel 200 also includes the third flow channel 220 in addition to the second flow channel 210.

[0044] In this embodiment, the base tube segment 110 and the introduction tube segment 120 are separately arranged, that is, the base tube segment 110 and the introduction tube segment 120 are two independent tube segments. The base tube segment 110 and the introduction tube segment 120 are connected to form the guide tube 100. Before connecting the base tube segment 110 and the introduction tube segment 120, the distal tube mouth of the introduction tube segment 120 can be folded inward to form an inverted portion 122. Since the length of the introduction tube segment 120 is shorter than that of the integrated guide tube 100, the clamping tool can be extended from the proximal tube mouth of the introduction tube segment 120 to clamp the inverted portion 122 for a short distance, thereby facilitating the lengthening of the inverted portion 122.

[0045] In an optional embodiment, all parts of the introduction tube segment 120 are located inside the base tube segment 110 , which means that when the inverted portion 122 is in an inverted state, all parts of the introduction tube segment 120 are located inside the base tube segment 110 .

[0046] In the present embodiment, after the inverted portion 122 of the introduction tube segment 120 is turned outward and unfolded, the distal tube opening of the unfolded portion 123 is the distal tube opening of the introduction tube segment 120, and is also the distal tube opening of the guide tube 100. The distal tube opening of the unfolded portion 123 is located at the distal side of the base tube segment 110, and all parts of the connecting portion 121 of the introduction tube segment 120 are sleeved inside the base tube segment 110. After the distal tube opening of the introduction tube segment 120 is folded inward to form the inverted portion 122, all parts of the inverted portion 122 are also located inside the base tube segment 110, so that the length dimension of the guide tube 100 can be reduced; and compared with the embodiment in which "the connecting portion 121 is sleeved outside the base tube segment 110", the present embodiment can also reduce the diameter dimension of the guide tube 100.

[0047] And / or, in an optional embodiment, the inverted portion 122 passes through the proximal end of the connecting portion 121 and extends into the base tube section 110, and a third flow channel 220 is formed between the inverted portion 122 and the inner wall of the base tube section 110, and the first flow channel 200 also includes the third flow channel 220. In this embodiment, the inverted portion 122 passes through the connecting portion 121, so that at least part of the inverted portion 122 will be exposed outside the connecting portion 121, and there is no physical structure restriction on the peripheral side of the part of the inverted portion 122 exposed outside the connecting portion 121, so that it is easier to flatten the inverted portion 122, that is, the inverted portion 122 is flattened, so that a part of the inverted portion 122 has a flat structure.

[0048] See also Figure 2 and Figure 3In an optional embodiment, a part of the inner wall of the base tube section 110 is sunken to form the installation groove 111, and the connecting portion 121 is installed in the installation groove 111, that is, the connecting portion 121 is embedded in the base tube section 110. In this embodiment, the base tube section 110 itself is used to accommodate a part of the connecting portion 121, which can make the connecting portion 121 further away from the part of the inverted portion 122 other than the folded part thereof (i.e., the extension section 1222 described above), thereby increasing the distance between the two and the volume of the third flow channel 220, and further increasing the contact area between the fluid and the folded part of the inverted portion 122, so as to shorten the time for the guide tube 100 to enter the target body cavity and better expand the target cavity.

[0049] As the inverted portion 122 extends into the target body cavity, the target body cavity will apply a reaction force to the inverted portion 122, and the reaction force is in a direction extending from the distal end to the proximal end of the connecting portion 121. In order to prevent the connecting portion 121 from being disconnected from the base tube segment 110 under the action of the reaction force, in an optional embodiment, the mounting groove 111 has a proximal wall, and the connecting portion 121 and the proximal wall are matched with an upper limit in a direction extending from the distal end to the proximal end of the connecting portion 121. In this way, when the target body cavity applies a reaction force to the inverted portion 122, the proximal wall of the mounting groove 111 can stop the connecting portion 121 to share the above-mentioned reaction force and prevent the connecting portion 121 from being disconnected from the base tube segment 110.

[0050] Since the fluid will exert a force on the inverted portion 122 and the connecting portion 121 connected to the inverted portion 122 in a direction extending from the proximal end to the distal end of the connecting portion 121 after passing into the first flow channel 200, in order to prevent the connecting portion 121 from being disconnected from the base tube section 110 under the action of this force, and / or, in an optional embodiment, the mounting groove 111 has a distal wall, and the connecting portion 121 and the distal wall are matched with an upper limit in a direction extending from the proximal end to the distal end of the connecting portion 121. In this way, when the fluid exerts this force on the connecting portion 121, the distal wall of the mounting groove 111 can stop the connecting portion 121 to share the above-mentioned force and prevent the connecting portion 121 from being disconnected from the base tube section 110.

[0051] The present application also discloses a medical device, including the guide tube 100 described in any of the above embodiments, so that the medical device has the beneficial effects of the above guide tube 100, which will not be described in detail here. Figures 8 to 9As shown, the medical device here can be an endoscope, or the medical device can also be a surgical instrument used with an endoscope; when the medical device is an endoscope, the endoscope includes an insertion portion 300, and an instrument channel 310 is provided in the insertion portion 300. The guide tube 100 can be integrated in the instrument channel 310, and the guide tube 100 can be used to pass the instrument. The endoscope referred to in the embodiment of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a nasoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiment of the present application does not specifically limit the type of the endoscope.

[0052] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A guide tube for entering a body cavity, characterized in that: The distal end of the guide tube (100) is folded toward the inside of the guide tube (100) to form an inverted portion (122), a first flow channel (200) is formed between the inverted portion (122) and the inner wall of other parts of the guide tube (100), and the inverted portion (122) is configured to expand toward the outside of the distal end of the guide tube (100) when a fluid having a pressure exceeding a first preset value is introduced into the first flow channel (200); When all parts of the inverted portion (122) are in an expanded state, the distal tube opening of the guide tube (100) is in a conducting state and communicates with the first flow channel (200), so that surgical instruments can pass through the distal tube opening of the guide tube (100) to enter the target body cavity; The guide tube (100) comprises a base tube section (110) and an introduction tube section (120) which are separately arranged; the distal tube opening of the guide tube (100) is the distal tube opening of the introduction tube section (120); the portion of the introduction tube section (120) other than the inverted portion (122) is a connecting portion (121); the connecting portion (121) is connected to the base tube section (110); a portion of the inner wall of the base tube section (110) is sunken to form a mounting groove (111); the connecting portion (121) is mounted in the mounting groove (111); When the inverted portion (122) is in an inverted state, all parts of the introduction tube section (120) are located within the base tube section (110).

2. The guide tube according to claim 1, characterized in that: The inverted portion (122) comprises a folded section (1221) and an extension section (1222); one end of the folded section (1221) is folded relative to other parts of the guide tube (100); the other end of the folded section (1221) is connected to the extension section (1222); and the extension section (1222) is a flat structure.

3. The guide tube according to claim 2, characterized in that: Along the thickness direction of the extension section (1222), the inner wall of the extension section (1222) comprises a first part and a second part which are arranged opposite to each other, and the first part and the second part are in contact with each other.

4. The guide tube according to any one of claims 1 to 3, characterized in that: The free end of the inverted portion (122) that is away from the other portion of the guide tube (100) is in a flattened state, so as to close the free end of the inverted portion (122).

5. The guide tube according to claim 4, characterized in that: The free end of the inverted portion (122) is provided with a connection structure, and the connection structure is configured to maintain the free end of the inverted portion (122) in a collapsed state when the fluid pressure in the first flow channel (200) is less than a second preset value, and to release the collapsed state of the free end of the inverted portion (122) when the fluid pressure in the first flow channel (200) is greater than or equal to the second preset value, so as to conduct the free end of the inverted portion (122); Wherein, the second preset value is greater than the first preset value.

6. The guide tube according to any one of claims 1 to 3, characterized in that: A second flow channel (210) is formed between the inner wall of the inverted portion (122) and the connecting portion (121); the first flow channel (200) includes the second flow channel (210); and the second flow channel (210) is connected to an internal flow channel of the base tube section (110).

7. The guide tube according to claim 6, characterized in that: The inverted portion (122) passes through the proximal tube opening of the connecting portion (121) and extends into the base tube section (110), and a third flow channel (220) is formed between the inverted portion (122) and the inner wall of the base tube section (110), and the first flow channel (200) further includes the third flow channel (220).

8. The guide tube according to claim 1, wherein the mounting groove (111) has a proximal wall, and the connecting portion (121) and the proximal wall are engaged in a limit position in a direction extending from the distal end to the proximal end of the connecting portion (121); and / or, The installation groove (111) has a distal wall, and the connecting portion (121) and the distal wall are engaged in a limit position in a direction extending from the proximal end to the distal end of the connecting portion (121).

9. A medical device, characterized in that: It comprises the guide tube (100) according to any one of claims 1 to 8.

Images