Fractional interventional tube assembly and bronchoscope

Abstract

The application discloses a hierarchical interventional tube body assembly and a bronchoscope. The hierarchical interventional tube body assembly comprises a plurality of sheath tubes which are sequentially sleeved from inside to outside, and each sheath tube is provided with an operation channel along the front-rear direction; in each two adjacent sheath tubes, the sheath tube located at the inner side has a first state of being accommodated in the operation channel of the sheath tube located at the outer side, a second state of being actively extended forward from the operation channel of the sheath tube located at the outer side, and a third state of being actively separated backward from the operation channel of the sheath tube located at the outer side. Based on the same bronchoscope, the hierarchical interventional tube body assembly can be flexibly combined to form a plurality of specifications of insertion tube assemblies, thereby being more convenient for flexibly adapting to different requirements of actual interventional environments, and making the bronchoscope as a whole more universal and reliable.

Description

Technical Field

[0001] This invention relates to the field of bronchial endoscopy technology, specifically to a graded interventional tubing assembly and a bronchial endoscope. Background Technology

[0002] A bronchoscope is a medical device used to observe the internal structure of the airway and to diagnose and treat respiratory diseases. It enters the airway through natural cavities, allowing for direct examination of lesions in the trachea, bronchi, and lungs, and supports procedures such as biopsies and interventional treatments.

[0003] Because the bronchi contain airways of various sizes, existing bronchoscopes typically use different sized insertion tubes for different airway sizes in order to better target treatment. However, this obviously increases the inconvenience of the diagnostic and treatment process. Summary of the Invention

[0004] The main objective of this invention is to propose a graded interventional tube assembly and a bronchial endoscope, which aims to solve the problem that traditional bronchial endoscopes cannot be used in airways of different sizes, resulting in inconvenient operation.

[0005] To achieve the above objectives, the present invention proposes a graded interventional tube assembly, comprising multiple sheaths sequentially sleeved from the inside to the outside, each of which has an operating channel extending along the front-back direction.

[0006] In each of two adjacent sheaths, the inner sheath has a first state in which it is received within the operating channel of the outer sheath, a second state in which it extends forward from the operating channel of the outer sheath, and a third state in which it disengages backward from the operating channel of the outer sheath.

[0007] Optionally, at least one of the sheaths comprises:

[0008] An insertion tube extends in a front-to-back direction, and at least a portion of the insertion tube is made of a flexible, bendable material, allowing the insertion tube to bend laterally; and,

[0009] An imaging device includes a mounting base and an imaging module housed within the mounting base. The mounting base is fixed to the front end of the insertion tube, and the imaging surface of the imaging module is exposed facing forward.

[0010] Optionally, the inner cannula includes a first tube and a second tube arranged side by side. The first tube has the operating channel extending in the front-back direction, and the second tube has a wiring channel extending in the front-back direction. The wiring channel is for installing the insertion tube and the imaging device, and for the cable of the imaging module to pass through.

[0011] The first tube and the second tube are fixedly connected, or the first tube and the second tube are detachably connected.

[0012] Optionally, the first tube and the second tube are detachably connected, and in the third state, the first tube moves backward to disengage;

[0013] The second tube, the insertion tube, and the imaging device are linked to be synchronously housed within the sheath located outside them, or can be detached rearward; or,

[0014] The insertion tube and the imaging device are linked to be synchronously housed within the second tube or can be detached rearward.

[0015] Optionally, each of the sheaths includes the inner cannula and at least two outer cannulas located outside the inner cannula.

[0016] Optionally, the inner cannula further includes an adjustment tube, which is movably and adjustably fitted onto the insertion tube in the front-back direction, and the hardness of the adjustment tube is greater than that of the insertion tube.

[0017] Optionally, one of every two adjacent sheaths is provided with a connecting portion and the other with a docking portion. In the first state, the connecting portion and the docking portion can be connected in a disengaging manner.

[0018] The connecting part and the mating part are mechanically connected, and can be separated when the external force is not less than a preset threshold; and / or,

[0019] The connecting part and the docking part are electrically connected and can be separated when a preset electrical signal is received.

[0020] Optionally, one of every two adjacent sheaths is provided with a connecting portion and the other with a docking portion. In the first state, either the connecting portion and either the docking portion can be connected in a disengaging manner.

[0021] In the sheath equipped with the imaging device, the connecting part or the docking part is linked to the imaging device.

[0022] In addition, to achieve the above objectives, the present invention also provides a bronchoscope, including operating components and a graded interventional tube assembly as described above.

[0023] Optionally, the bronchoscope further includes a drive mechanism, which is located on the operating component and connected to each of the sheaths to drive each of the sheaths to switch between the first state, the second state, and the third state.

[0024] In the technical solution provided by this invention, when the size of the currently intervened airway is large and the requirement for sheath flexibility is low, each sheath can be operated in a first state. When the size of the currently intervened airway decreases and / or the requirement for flexibility increases, the sheath located on the inner side can be operated step by step to a second state according to actual needs. This allows the inner sheath, with a relatively smaller overall outer diameter and relatively increased flexibility, to extend from the outer sheath, facilitating further interventional diagnostic and treatment procedures. When the size of the currently intervened airway is large but the requirement for sheath flexibility is high, the sheath located on the inner side can be operated step by step to a third state according to actual needs. This keeps the overall outer diameter of the insertion tube unchanged but increases its flexibility, facilitating further interventional diagnostic and treatment procedures. This invention, based on the same bronchoscope, can flexibly combine to form various specifications of insertion tubes, thus making it more convenient to flexibly adapt to different needs in actual interventional environments, making the bronchoscope more versatile and reliable overall. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A perspective view of an embodiment of the graded interventional catheter assembly provided by the present invention;

[0027] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0028] Figure 3 for Figure 1 Axial schematic diagram of the intermediate-level interventional catheter assembly;

[0029] Figure 4 for Figure 1 A three-dimensional schematic diagram of the middle and outer cannulas;

[0030] Figure 5 for Figure 4 A schematic diagram of the front end structure of the middle and outer cannulas, in which the fluoroscopic element is assembled to the main tube body;

[0031] Figure 6 for Figure 4 A schematic diagram of the front end structure of the middle and outer cannulas, in which the fluoroscopic lens is not assembled to the main tube body;

[0032] Figure 7 for Figure 1A three-dimensional schematic diagram of the insertion tube and imaging device in the inner cannula;

[0033] Figure 8 for Figure 7 Enlarged structural diagram at point B;

[0034] Figure 9 for Figure 1 Axial schematic diagram of the inner layer cannula in the third state;

[0035] Figure 10 for Figure 1 Axial schematic diagram of the second embodiment with the inner cannula and the first outer cannula in the third state;

[0036] Figure 11 for Figure 1 A schematic diagram of the third embodiment showing the inner cannula and the first outer cannula in the third state.

[0037] Explanation of icon numbers:

[0038] 100 Inner cannula; 110 Insertion tube; 120 Imaging device; 121 Fixing base; 122 Imaging module; 130 Adjustment tube; 141 Fixing part; 142 Fixing mating part; 150 First tube body; 160 Second tube body; 200a First outer cannula; 200b Second outer cannula; 201 Front tube section; 201a Imaging tube wall section; 201b Liquid passage tube wall section; 202 Rear tube section; 203 Wiring channel; 204 Liquid passage channel; 205 Operation channel; 206 Traction channel; 210 Main tube body; 211 Installation notch; 220 Transparent element; 221 Main body; 222 Extension arm; 223 Insertion protrusion; 224 Insertion interface; 231 Connecting part; 232 Docking part; 310 First base body; 320 Second base body; 400 Traction line.

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] Please see Figures 1 to 11 The present invention provides a graded interventional tube assembly (hereinafter referred to as the insertion tube) and the bronchial endoscope used therein.

[0044] A bronchoscope generally includes an operating component and an insertion tube. For ease of understanding, the following embodiments will use an example where the bronchoscope has both anterior and posterior orientations. The insertion tube extends posteriorly and is attached to the front end of the operating component. During actual interventional procedures, at least the front portion of the insertion tube is inserted into the patient's body. The operating component is external and can be held and operated by the operator.

[0045] The inserted pipe fitting typically features at least a partially adjustable lateral bending section. The lateral bending characteristic of this section can be directly defined by the material. For example, at least the lateral bending section of the inserted pipe fitting can be made of a flexible, bendable material. Alternatively, it can be made of an elastic, bendable material. Of course, the lateral bending characteristic can also be defined by a special structure. For example, at least the lateral bending section of the inserted pipe fitting can be composed of two movable, hinged individual components.

[0046] The lateral bending movement of the inserted pipe fitting can be achieved by a traction mechanism. Specifically, the traction mechanism may include a traction line 400 and a reel. Correspondingly, the inserted pipe fitting has a traction channel 206 extending rearward from at least the lateral bending section. The front section of the traction line 400 is movably inserted through the traction channel 206. The front end of the traction line 400 is connected and fixed to the side wall of the lateral bending section. The rear section of the traction line 400 is connected and fixed to the reel. Thus, when the operator manually operates or the reel is automatically driven to rotate around its own axis based on specific electronic control components, the traction line 400 can be driven to perform a winding stroke or a release stroke. During the winding stroke, the traction line 400 has a rearward force, which can cause the corresponding side of the lateral bending section to be stressed, achieving the purpose of lateral bending deformation of the lateral bending section. Conversely, during the release stroke, the rearward force of the traction line 400 is removed, and the lateral bending section can be reset under the action of, for example, an elastic restoring force. Alternatively, the traction line 400 has a forward force, which causes the lateral bending section to reset.

[0047] It should be noted that the aforementioned insert fitting can be bent in one direction or at least in two directions. Specifically, when the insert fitting can be bent in two directions, the two bends can be located in opposite directions on the same radial direction of the insert fitting.

[0048] When the inserted tube can be bent in four directions, in one specific embodiment, at least one sheath is made of a flexible, bendable material. The sheath has four traction channels 206 along its front-to-back direction. Two of the four traction channels 206 are located on either side of the sheath in the first radial direction, and the remaining two are located on either side of the sheath in the second radial direction. The tiered interventional tube assembly also includes four traction wires 400, which are correspondingly inserted through the four traction channels 206. The front end of each traction wire 400 is connected and fixed to the sheath, and the rear end is used to connect to an external driving component, allowing it to move back and forth under the drive of the external driving component, thus bending and deforming the sheath in the direction it is located. The first and second radial directions are at least intersecting. Furthermore, the first and second radial directions can be approximately perpendicular.

[0049] Specifically, please combine Figures 1 to 11 The graded interventional tube assembly includes multiple sheaths sequentially sleeved from the inside to the outside, each sheath having an operating channel 205 extending through it in the front-back direction; wherein, in every two adjacent sheaths, the inner sheath has a first state of being housed within the operating channel 205 of the outer sheath, a second state of extending forward from the operating channel 205 of the outer sheath, and a third state of disengaging backward from the operating channel 205 of the outer sheath.

[0050] In the technical solution provided by this invention, when the size of the currently intervened airway is large and the requirement for sheath flexibility is low, each sheath can be operated in a first state. When the size of the currently intervened airway decreases and / or the requirement for flexibility increases, the sheath located on the inner side can be operated step by step to a second state according to actual needs. This allows the inner sheath, with a relatively smaller overall outer diameter and relatively increased flexibility, to extend from the outer sheath, facilitating further interventional diagnostic and treatment procedures. When the size of the currently intervened airway is large but the requirement for sheath flexibility is high, the sheath located on the inner side can be operated step by step to a third state according to actual needs. This keeps the overall outer diameter of the insertion tube unchanged but increases its flexibility, facilitating further interventional diagnostic and treatment procedures. This invention, based on the same bronchoscope, can flexibly combine to form various specifications of insertion tubes, thus making it more convenient to flexibly adapt to different needs in actual interventional environments, making the bronchoscope more versatile and reliable overall.

[0051] It is understood that each sheath generally has an operating channel 205 extending in the front-to-back direction. The operating channel 205 allows for the insertion of, for example, diagnostic or therapeutic instruments. In every two adjacent sheaths, the inner sheath is movably inserted into the operating channel 205 located on the outer side.

[0052] The forward and backward movement of the inner sheath relative to the outer sheath can be directly achieved manually by the operator. Alternatively, in one embodiment, the bronchoscope also includes a drive mechanism located in the operating components and connected to each sheath to drive the sheaths to switch between a first state, a second state, and a third state. In this way, the forward and backward movement of each sheath can be more precisely controlled and adjusted using the drive mechanism.

[0053] Please combine Figures 1 to 3 ,as well as Figures 7 to 11 The following will provide a detailed explanation of the inner cannula 100.

[0054] The inner cannula 100 may include an insertion tube 110 and an imaging device 120. The insertion tube 110 extends in a front-to-back direction. At least a portion of the insertion tube 110 is made of a flexible, bendable material, allowing it to bend laterally. The imaging device 120 includes a mounting base 121 and an imaging module 122 housed within the mounting base 121. The mounting base 121 is fixed to the front end of the insertion tube 110. The imaging surface of the imaging module 122 is exposed facing forward.

[0055] It is understood that the insertion tube 110 and the imaging device 120 can directly form the overall structure of the inner insertion tube 100 and be movably inserted inside the outer insertion tube.

[0056] Alternatively, in a further embodiment, the inner cannula 100 may also include a first tube 150 and a second tube 160 arranged side by side. The first tube 150 is provided with an operating channel 205 in the front-to-back direction, and the second tube 160 is provided with a wiring channel 203 in the front-to-back direction. The wiring channel 203 is for the installation of the insertion tube 110 and the imaging device 120, and for the cable of the imaging module 122 to pass through.

[0057] The first tube 150 and the second tube 160 can be integrally formed. In this case, the first tube 150 and the second tube 160 are fixedly connected in an inseparable manner. According to actual needs:

[0058] When the inner cannula 100 is in the second state, specifically, the first tube 150, the second tube 160, the imaging device 120, and the insertion tube 110 can all extend forward from the outer cannula. Alternatively, only the imaging device 120 and the insertion tube 110 can extend forward from the outer cannula, while the first tube 150 and the second tube 160 remain housed within the outer cannula.

[0059] When the inner cannula 100 is in the third state, specifically, the first tube 150, the second tube 160, the imaging device 120, and the insertion tube 110 can all move rearward from the outer cannula. Alternatively, only the imaging device 120 and the insertion tube 110 can move rearward from the outer cannula, while the first tube 150 and the second tube 160 remain housed within the outer cannula.

[0060] Of course, the first tube 150 and the second tube 160 can be formed separately and then connected in a detachable or non-detachable manner. When the first tube 150 and the second tube 160 are connected in a non-detachable manner, please refer to the above description. When the first tube 150 and the second tube 160 are connected in a detachable manner, that is, the first tube 150 and the second tube 160 can be separated or connected.

[0061] When the connection is established, the same principle applies as above:

[0062] If the inner cannula 100 is in the second state, specifically, the first tube 150, the second tube 160, the imaging device 120, and the insertion tube 110 can all extend forward from the outer cannula. Alternatively, only the imaging device 120 and the insertion tube 110 can extend forward from the outer cannula, while the first tube 150 and the second tube 160 remain housed within the outer cannula.

[0063] When the inner cannula 100 is in the third state, specifically, the first tube 150, the second tube 160, the imaging device 120, and the insertion tube 110 can all move rearward from the outer cannula. Alternatively, only the imaging device 120 and the insertion tube 110 can move rearward from the outer cannula, while the first tube 150 and the second tube 160 remain housed within the outer cannula.

[0064] When in a separated state:

[0065] When the inner cannula 100 is in the second state, specifically, the first tube 150, the second tube 160, the imaging device 120, and the insertion tube 110 can all extend forward from the outer cannula. Alternatively, only the imaging device 120 and the insertion tube 110 can extend forward from the outer cannula, while the first tube 150 and the second tube 160 remain housed within the outer cannula. Alternatively, the first tube 150 can extend forward from the outer cannula, while the second tube 160, the insertion tube 110, and the imaging device 120 remain housed within the outer cannula. Alternatively, the second tube 160, the insertion tube 110, and the imaging device 120 can all extend forward from the outer cannula, while the first tube 150 remains housed within the outer cannula.

[0066] When the inner cannula 100 is in the third state, specifically, the first tube 150, the second tube 160, the imaging device 120, and the insertion tube 110 can all move rearward from the outer cannula. Alternatively, only the imaging device 120 and the insertion tube 110 can move rearward from the outer cannula, while the first tube 150 and the second tube 160 remain housed within the outer cannula. Alternatively, the first tube 150 can move rearward from the outer cannula; the second tube 160, the insertion tube 110, and the imaging device 120 can all remain housed within the outer cannula. Alternatively, the second tube 160, the insertion tube 110, and the imaging device 120 can all move rearward from the outer cannula; the first tube 150 remains housed within the outer cannula.

[0067] Furthermore, the inner insertion cannula 100 may also include an adjustment tube 130. The adjustment tube 130 is movably and adjustably fitted onto the insertion tube 110 in the front-to-back direction. The adjustment tube 130 has a higher stiffness than the insertion tube 110. By adjusting the adjustment tube 130 to move forward relative to the insertion tube 110 closer to the fixing seat 121, the adjustment tube 130 is fully fitted onto the insertion tube 110. The greater stiffness of the adjustment tube 130 helps to appropriately increase the overall stiffness of the sheath in its current state, facilitating deeper exploration after the sheath reaches its limit position. Conversely, by adjusting the adjustment tube 130 to move backward relative to the insertion tube 110 away from the fixing seat 121, the insertion tube 110 is directly exposed. The flexibility of the insertion tube 110 itself helps to appropriately increase the overall flexibility of the sheath in its current state, facilitating lateral bending deformation of the sheath according to the airway environment. The sheath provided in this application can be adjusted in terms of softness and hardness, and the adjustment process is flexible and efficient, which helps to adapt to airways of different sizes and shapes, making bronchial endoscopy-based diagnostic and treatment operations simpler and more reliable.

[0068] It is understandable that, in order to achieve the purpose of the bendable and deformable design of the insertion tube 110, the insertion tube 110 can be made of, for example, a stainless steel flexible tube or a polymer flexible tube. This allows the insertion tube 110 to have both sufficient flexibility and sufficient structural strength.

[0069] To achieve a higher hardness for the regulating tube 130 than for the insertion tube 110, the regulating tube 130 can be made of rigid steel or a rigid tube of polymer material. When both the insertion tube 110 and the regulating tube 130 are made of polymer material, the hardness of the polymer material used to make the insertion tube 110 is lower than the hardness of the polymer material used to make the regulating tube 130.

[0070] It should be noted that the materials used to make the insertion tube 110 and the adjustment tube 130 can be differentiated as described above, so as to achieve a higher hardness for the adjustment tube 130 than for the insertion tube 110. In this case, the structural parameters of the insertion tube 110 and the adjustment tube 130 can be set to be the same or different.

[0071] Alternatively, the materials used to make the insertion tube 110 and the adjustment tube 130 can be the same. In this case, to achieve a higher hardness for the adjustment tube 130 than for the insertion tube 110, the structural parameters of the insertion tube 110 and the adjustment tube 130 can be adjusted. For example, but not limited to, adjusting the wall thickness of the insertion tube 110 to be less than the wall thickness of the adjustment tube 130. And / or, a portion of the insertion tube 110 can be hollowed out. For example, an elongated hole can be formed circumferentially in a portion of the insertion tube 110.

[0072] Of course, regardless of any differences in the materials and structural parameters used to manufacture the insertion tube 110 and the regulating tube 130, the rigidity of the regulating tube 130 can be enhanced by adding other structures to its surface or interior. For example, an additional reinforcing layer can be attached to the outer and / or inner surface of the regulating tube 130. The reinforcing layer has sufficient rigidity to meet the requirements.

[0073] Furthermore, the adjusting tube 130 described above can be located radially inside the insertion tube 110:

[0074] Specifically, when the outer diameter of the adjusting tube 130 is smaller than the inner diameter of the insertion tube 110, the adjusting tube 130 can be movably inserted inside the insertion tube 110.

[0075] Alternatively, when the inner diameter of the adjusting tube 130 is larger than the inner diameter of the insertion tube 110, and the outer diameter of the adjusting tube 130 is smaller than the outer diameter of the outer tube body, a groove can be made in the wall of the insertion tube 110 from back to front. The adjusting tube 130 is movably inserted through this groove. In this way, when the adjusting tube 130 does not move forward to cover the insertion tube 110, the groove can appropriately reduce the rigidity of the insertion tube 110 itself, that is, increase the flexibility of the insertion tube 110, making it easier for the insertion tube 110 to bend laterally. Furthermore, the groove ensures that the forward and backward movement of the adjusting tube 130 occurs within the insertion tube 110. The overall outer diameter of the inner insertion tube 100 remains unchanged.

[0076] The adjusting tube 130 described above can also be located radially outside the insertion tube 110. Specifically, the inner diameter of the adjusting tube 130 is larger than the outer diameter of the insertion tube 110. In this case, by differentiating the materials as described above to sufficiently meet the aforementioned hardness requirements, the wall thickness of the adjusting tube 130 can be set to be smaller, forming a thin-walled tube with higher hardness. This ensures that when the adjusting tube 130 moves forward to completely cover the insertion tube 110, the increased outer diameter of the inner insertion tube 100 does not change excessively.

[0077] It should be noted that the aforementioned adjusting tube 130 can be directly configured as a tube, and during its forward and backward movement, it completely covers the insert tube 110 circumferentially. Alternatively, at least a portion of the aforementioned adjusting tube 130 can be configured as a non-tubular shape. For example, in one embodiment, the adjusting tube 130 includes a sleeve section and a reinforcing rib. The sleeve section is arranged circumferentially around the insert tube 110. The reinforcing rib extends forward and backward and connects to the sleeve section. The radial cross-sectional area of ​​the reinforcing rib is annular in shape with an installation notch 211, and is not arranged circumferentially around the entire insert tube 110. In this case, the reinforcing rib can locally enhance the hardness of the insert tube 110 in the circumferential direction. The sleeve section can be configured as one or at least two. And any sleeve section can be connected at any suitable position of the reinforcing rib.

[0078] Furthermore, the hardness of the aforementioned regulating tube 130 can be set uniformly in the forward and backward direction. Alternatively, the hardness of the aforementioned regulating tube 130 can be differentiated in different segments in the forward and backward direction. For example, the regulating tube 130 includes a first segment and a second segment. The hardness of the first segment is greater than that of the second segment. In this way, when the regulating tube 130 moves forward to completely cover the insertion tube 110, different hardness enhancements can be formed at different segments of the insertion tube 110 in the forward and backward direction. In particular, when the insertion tube 110 includes an active side-bending segment and a passive side-bending segment in the forward and backward direction, or when the insertion tube 110 includes a side-bending segment and a non-side-bending segment in the forward and backward direction, different hardness enhancements can be applied to the active side-bending segment, the passive side-bending segment, the side-bending segment, and the non-side-bending segment.

[0079] Furthermore, the aforementioned adjusting tube 130 includes at least two tube layers sequentially nested from the inside out, and any tube layer can be adjusted in a forward-backward direction relative to the insertion tube 110. It can be understood that since each individual tube layer can move forward and backward relative to the insertion tube 110, the more tube layers that move forward and cover the same segment of the insertion tube 110, the greater the hardness enhancement and the larger the hardness increment at that segment. Conversely, the fewer tube layers that move forward and cover the same segment of the insertion tube 110, the smaller the hardness enhancement and the smaller the hardness increment at that segment. This allows for greater flexibility in adjusting the hardness of the inner insertion tube 100.

[0080] Based on one or more of the above embodiments, the inner cannula 100 further includes a fixing part 141 and a fixing mating part 142. The fixing part 141 is disposed on the fixing seat 121 and / or the insertion tube 110, and the fixing mating part 142 is disposed on the adjusting tube 130. After the adjusting tube 130 moves forward to near the fixing seat 121, the fixing mating part 142 and the fixing part 141 connect to limit the adjusting tube 130 to its current position. When the fixing part 141 and the fixing mating part 142 separate, they will not interfere with the forward and backward movement of the adjusting tube 130 relative to the insertion tube 110, ensuring smoother and unimpeded forward and backward movement of the adjusting tube 130. When the fixing part 141 and the fixing mating part 142 connect, the connection and fixation of the adjusting tube 130 and the insertion tube 110 can be realized simultaneously. In this way, abnormal situations such as the adjusting tube 130 shifting backward relative to the insertion tube 110 can be avoided during interventional diagnosis and treatment.

[0081] It should be noted that the aforementioned fixing part 141 and fixing mating part 142 can only limit the adjustment tube 130 and the insertion tube 110 in the front-back upward direction. Alternatively, the aforementioned fixing part 141 and fixing mating part 142 can further limit the adjustment tube 130 and the insertion tube 110 in the circumferential direction. That is, when the fixing part 141 and fixing mating part 142 are connected, it can be ensured that the adjustment tube 130 and the insertion tube 110 will not rotate relative to each other.

[0082] There are several specific designs for the fixing part 141 and the fixing mating part 142:

[0083] For example, the fixing part 141 and the fixing mating part 142 are structures that can magnetically engage with each other. For example, both the fixing part 141 and the fixing mating part 142 are magnetic elements. Alternatively, one of the fixing part 141 and the fixing mating part 142 is a magnetic element, and the other is a structure made of a metal material containing iron, cobalt, and nickel. Specifically, in one embodiment, the fixing part 141 is a magnetic element provided on the fixing base 121 and / or the insertion tube 110. The magnetic element can be connected to the radially outer edge and radially inner side of the fixing base 121 and / or the insertion tube 110. Alternatively, the magnetic element can be connected to the rear end of the fixing base 121. The adjusting tube 130 is made of a metal material containing iron, cobalt, and nickel, and at least a partial section of the adjusting tube 130 constitutes the fixing mating part 142. For example, the adjusting tube 130 is directly made of steel containing iron, cobalt, and nickel, which can both magnetically attract with the magnetic element and ensure sufficient rigidity.

[0084] Alternatively, for example, one of the rear end of the fixing base 121 and the front end of the adjusting tube 130 may be provided with a slot, and the other with a protrusion, with the slot and protrusion being inserted into each other. Specifically, in one embodiment, the outer diameter of the rear end of the fixing base 121 is larger than the outer diameter of the adjacent insertion tube 110, and a slot is recessed rearward, forming a fixing part 141; the front end of the adjusting tube 130 is protruding forward, forming a fixing mating part 142. The radial outer surface of the protrusion may be set as a bevel or a convex arc surface to form a relatively smooth transition and avoid structural interference to the periphery.

[0085] The mounting base 121 has at least a slot and / or at least a protrusion made of an elastic material, and the inner diameter of the slot is smaller than the outer diameter of the protrusion. Specifically, when the slot is made of an elastic material, the slot width can be set to be relatively small, equivalent to a slit. This allows the slit to remain essentially closed when the protrusion is not inserted, preventing the entry of surrounding contaminants. When the protrusion is inserted by an external force, the slit can be opened, allowing the two to engage. At this time, the elastic material can apply sufficient compressive force to the protrusion, enhancing the engagement strength between the protrusion and the slot.

[0086] In view of the above, when in the first state, the imaging device 120 can protrude forward from the front end opening of the second tube 160. Alternatively, the imaging device 120 can be housed within the second tube 160 and aligned with the front end opening of the second tube 160. Alternatively, the imaging device 120 can be housed within the second tube 160 and retract rearward relative to the front end opening of the second tube 160. When the imaging device 120 retracts rearward relative to the front end opening of the second tube 160, its specific structure can be referred to the outer cannula described below, and will not be repeated here.

[0087] Next, please combine Figures 1 to 3 ,as well as Figures 4 to 6 The following will provide a detailed description of the outer cannula. At least two outer cannulas are provided. For ease of understanding, in the following embodiments, the tiered interventional cannula assembly is specifically defined as including a first outer cannula 200a near the inner cannula 100 and a second outer cannula 200b away from the inner cannula 100.

[0088] First, it should be noted that the structures of the first outer cannula 200a and the second outer cannula 200b can be differentiated according to actual needs. Alternatively, the structures of the first outer cannula 200a and the second outer cannula 200b can be identical.

[0089] Since at least the imaging surface of the imaging device 120 is recessed within the outer cannula, for ease of understanding, when the inner cannula 100 is in the first state, or when both the inner cannula 100 and the first outer cannula 200a are in the first state, the outer cannula includes a front tube segment 201 located in front of the imaging surface and a rear tube segment 202 located behind the imaging surface. The front tube segment 201 includes an imaging tube wall segment 201a and a liquid-passing tube wall segment 201b arranged sequentially along its circumference. The imaging tube wall segment 201a is disposed adjacent to the imaging surface and is made of a transparent material. In this way, the imaging tube wall segment 201a can be made transparent and visible without affecting the imaging process of the imaging device 120.

[0090] The central arc angle of the imaging tube wall section 201a is not less than 90°. Specifically, the central arc angle of the imaging tube wall section 201a can be set to approximately 90° to 120°. This angle range is more suitable for the imaging requirements of the imaging device 120 in practical applications, thus sufficiently ensuring the imaging quality of the bronchoscope.

[0091] It should be noted that, depending on actual needs, the liquid-passing tube wall section 201b and / or the rear tube section 202 can also be made of transparent material, thereby making the overall structure of the outer tube uniform and easier to process and shape.

[0092] The aforementioned front pipe section 201, which at least constitutes the portion of the liquid-passing pipe wall section 201b, and the rear pipe section 202 can be integrally formed. Alternatively, the front pipe section 201, which at least constitutes the portion of the liquid-passing pipe wall section 201b, and the rear pipe section 202 can be obtained by detachable or non-detachable connection after separate molding. Specifically, the outer insert includes a main pipe body 210 and a viewing element 220. The front end of the main pipe body 210 is partially recessed rearward to form an installation notch 211, such that the pipe section of the main pipe body 210 located behind the installation notch 211 constitutes the rear pipe section 202, and the pipe wall section of the main pipe body 210 located on the radial side of the installation notch 211 constitutes the liquid-passing pipe wall section 201b. The fluoroscopic element 220 includes a main body 221 inserted into the mounting notch 211 and extension arms 222 protruding from the front end of the main body 221 to both sides in the circumferential direction. The extension arms 222 cover a portion of the front end of the liquid-passing tube wall section 201b, and the front end surface of the extension arms 222 is provided in a convex arc shape. At least the main body 221 of the fluoroscopic element 220 constitutes the imaging tube wall section 201a.

[0093] The perspective element 220 can be directly inserted into the main body 210. Specifically, the perspective element 220 may also include an insertion protrusion 223. The insertion protrusion 223 is inserted into the front end opening of the main body 210. The outer diameter of the insertion protrusion 223 is generally slightly smaller than the outer diameter of the main body 221, so that after insertion, the outer diameter of the main body 221 and the outer diameter of the main body 210 at least adjacent to it are matched, resulting in a smooth transition connection and avoiding the formation of steps or sharp protrusions. The extension arm 222 can form a relatively smooth front end surface. This also avoids the formation of sharp protrusions at the front end of the main body 210.

[0094] Furthermore, the outer tube is provided with a liquid passage 204 running longitudinally, located at the liquid passage wall section 201b. Of course, depending on actual needs, the liquid passage 204 can be located throughout the entire rear tube section 202, as well as at the liquid passage wall section 201b of the front tube section 201. This allows for a larger radial cross-sectional area of ​​the liquid passage 204 at the rear tube section 202, enabling more liquid to flow through.

[0095] The tiered interventional cannula assembly also includes a seat mounted at the rear end of each sheath, with a fluid passage 204 extending rearward through the side wall of the seat. The aforementioned traction passage 206 can also extend through the side wall of the seat, allowing the traction cable 400 to exit from the side wall of the seat.

[0096] Specifically, in one embodiment, each outer cannula is provided with a fluid passage 204. At least two seats are provided corresponding to each fluid passage 204, and each seat is sequentially connected to the rear end of each sheath in a front-to-back direction, so that each fluid passage 204 is independent of the others. For example, the seat of the first outer cannula 200a is a first seat 310. The seat of the second outer cannula 200b is a second seat 320. The first seat 310 is located in front of the second seat 320.

[0097] When each liquid passage 204 is independently configured using different seats, the flow state of the liquid in each passage can be specifically set according to actual needs. For example, both the liquid passage 204 at the first outer cannula 200a and the liquid passage 204 at the second outer cannula 200b can draw liquid outwards. Alternatively, both the liquid passage 204 at the first outer cannula 200a and the liquid passage 204 at the second outer cannula 200b can inject liquid inwards. Or, one of the liquid passage 204 at the first outer cannula 200a and the liquid passage 204 at the second outer cannula 200b can draw liquid outwards while the other injects liquid inwards.

[0098] Similarly, in each pair of adjacent sheaths, one has a connecting portion 231 and the other has a mating portion 232. In the first state, the connecting portion 231 and the mating portion 232 can be detachably connected. The connecting portion 231 and the mating portion 232 are generally arranged in pairs in each pair of adjacent sheaths. However, for ease of understanding, in the structure shown in the figure, the connecting portion 231 is specifically located at the inner insert 100, and the mating portion 232 is located at the outer insert. It should be understood that this does not constitute a limitation on the assembly scheme of the connecting portion 231 and the mating portion 232.

[0099] The connecting part 231 and the docking part 232 are mechanically connected and can be separated when the external force is not less than a preset threshold. For example, when a drive mechanism is provided as described above, the connection part 231 and the docking part 232 can be connected and separated by adjusting the magnitude of the external force applied to the sheath by the drive mechanism.

[0100] At this point, there are various specific designs for the connecting part 231 and the mating part 232, such as the fixing part 141 and the fixed mating part 142 described above. In one specific embodiment, the connecting part 231 and the mating part 232 are respectively a magnetically adsorbable magnetic attractant and a magnetic mating part. The magnetic mating part can be another magnetic attractant, or it can be a structure made of an iron-cobalt-nickel material.

[0101] And / or, the connecting part 231 and the docking part 232 are electrically connected and can be separated upon receiving a preset electrical signal. Specifically, for example, one of the connecting part 231 and the docking part 232 can be an electromagnet, and the other can be a magnetic coupling structure that cooperates with the electromagnet. When the electromagnet is energized, it can magnetically attract the magnetic coupling structure. Conversely, when the electromagnet is de-energized, it can separate from the magnetic coupling structure.

[0102] It should be noted that when adopting the above-mentioned electromagnet and magnetic combination structure, it is preferable to place it between every two adjacent outer inserts. Furthermore, it should be avoided between the first outer insert 200a and the inner insert 100 to prevent electromagnetic fields from affecting the normal operation of the imaging device 120.

[0103] When the perspective element 220 includes a main body 221, an extension arm 222, and a insertion protrusion 223 as described above, the perspective element 220 may further have an insertion interface 224 at the insertion protrusion 223. The insertion interface 224 can form a clearance space for the installation of an outer insertion tube, such as a docking part 232, at the location.

[0104] Furthermore, the connecting portion 231 provided at the inner cannula 100 is preferably connected in conjunction with the imaging device 120, so that when the inner cannula 100 is in the third state and the imaging device 120 and the insertion tube 110 are maintained within the operating channel 205 of the outer cannula, the imaging device 120 can still be fixed relative to the outer cannula.

[0105] Furthermore, when the paired connecting portion 231 and docking portion 232 are interchangeable, specifically, for example, the connecting portion 231 located at the inner cannula 100 can be connected to the docking portion 232 located at the first outer cannula 200a, or it can be connected to the docking portion 232 located at the second outer cannula 200b. Then, when the first outer cannula 200a is in the third state, and at least the imaging device 120 of the inner cannula 100 can remain within the second outer cannula 200b, it can still be connected to the docking portion 232 located at the second outer cannula 200b. In this way, the second outer cannula 200b in the current state can still be equipped with the imaging device 120, which can be used for imaging diagnosis and treatment.

[0106] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A graded interventional catheter assembly, characterized in that, It includes multiple sheaths that are sequentially connected from the inside to the outside, and each sheath has an operating channel running through it in the front-back direction; In each of two adjacent sheaths, the inner sheath has a first state in which it is received within the operating channel of the outer sheath, a second state in which it extends forward from the operating channel of the outer sheath, and a third state in which it disengages backward from the operating channel of the outer sheath. At least one of the sheaths is an inner cannula, which includes an insertion tube, an imaging device, and a first tube body and a second tube body arranged side by side. The insertion tube extends in a front-rear direction, and at least a portion of the insertion tube is made of a flexible and bendable material so that the insertion tube can be bent laterally. The imaging device includes a mounting base and an imaging module housed in the mounting base. The mounting base is fixed to the front end of the insertion tube, and the imaging surface of the imaging module is exposed facing forward. The first tube body has an operating channel extending in a front-rear direction, and the second tube body has a wiring channel extending in a front-rear direction. The wiring channel is for mounting the insertion tube and the imaging device, and for the cable of the imaging module to pass through. The first tube and the second tube are separately formed and can be detachably connected. In the third state, the first tube moves backward and detaches; wherein: In one state, the second tube, the insertion tube, and the imaging device are linked to be synchronously housed within the sheath located outside it or can be detached rearward; or in another state, the insertion tube and the imaging device are linked to be synchronously housed within the second tube or can be detached rearward from the second tube.

2. The graded interventional catheter assembly as described in claim 1, characterized in that, Each of the sheaths includes the inner cannula and at least two outer cannulas located outside the inner cannula.

3. The graded interventional catheter assembly as described in any one of claims 1 to 2, characterized in that, The inner cannula also includes an adjustment tube, which is movably and adjustably fitted onto the insertion tube in the front-to-back direction, and the hardness of the adjustment tube is greater than that of the insertion tube.

4. The graded interventional catheter assembly as described in claim 1, characterized in that, One of every two adjacent sheaths is provided with a connecting part and the other with a docking part. In the first state, the connecting part and the docking part can be connected in a disengaging manner. The connecting part and the docking part are mechanically connected, and can be separated when the external force is not less than a preset threshold. And / or, The connecting part and the docking part are electrically connected and can be separated when a preset electrical signal is received.

5. The graded interventional catheter assembly as described in claim 1, characterized in that, One of every two adjacent sheaths is provided with a connecting part and the other with a docking part. In the first state, either the connecting part and either the docking part can be connected in a disengaging manner. In the sheath equipped with the imaging device, the connecting part or the docking part is linked to the imaging device.

6. A bronchoscope, characterized in that, It includes operating components and a graded interventional catheter assembly as described in any one of claims 1 to 5.

7. The bronchoscope as described in claim 6, characterized in that, The bronchoscope further includes a drive mechanism, which is located on the operating component and connected to each of the sheaths to drive each of the sheaths to switch between the first state, the second state, and the third state.

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