OCT elongated catheter and OCT diagnosis and treatment instrument
By dividing the OCT insertion tube into multiple torsion-controlled segments and connecting them with a docking structure, the problems of complex molding and unstable torsion ratio of traditional OCT imaging probes are solved, achieving a more efficient design of diagnostic and therapeutic devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING FORSSMANN MEDICAL TECH CO LTD
- Filing Date
- 2024-12-26
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional OCT imaging probes have complex torsion control coils, and when they are long, the torsion ratio is unstable, which affects the diagnostic and treatment results.
The insertion tube is divided into at least two torsion-controlled tube segments and connected by a butt joint structure. The stiffness and elastic modulus of the first torsion-controlled tube segment are greater than those of the second torsion-controlled tube segment. The segments are formed independently to adjust the torsion ratio and enhance the connection strength.
The molding process is simplified, the torsion ratio stability and molding quality of the insertion tube are improved, and the diagnostic and treatment needs of different medical fields are met.
Smart Images
Figure CN224320912U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of OCT diagnostic and therapeutic device technology, specifically to an OCT slender catheter and an OCT diagnostic and therapeutic device. Background Technology
[0002] Optical coherence tomography (OCT) is a non-invasive imaging technique that uses the principle of light interference to obtain high-resolution cross-sectional images of biological tissues. OCT can provide microscopic structural information similar to a biopsy, but without the need for physical removal of tissue samples, hence it is also known as "optical biopsy." This technology was originally designed for ophthalmology, particularly for the diagnosis and research of retinal diseases, as it can clearly display the structure of the different layers of the retina. However, with technological advancements, OCT has been applied to numerous medical fields and other industrial applications, such as cardiovascular disease, dermatology, and dentistry.
[0003] The traditional OCT imaging probe's transmission structure includes an optical fiber body, an optical fiber lens, an external tube, and an insertion tube. The external tube is connected to the distal end of the optical fiber body and is generally a torsion tube. The insertion tube is connected to the distal end of the external tube and is generally a torsion control coil. The optical fiber lens is connected to the optical fiber body and passes sequentially through the external tube and the insertion tube. In practical applications, the insertion tube of the OCT imaging probe is inserted into the patient's body to perform corresponding diagnostic and treatment procedures. The torsion control coil is usually composed of a multi-strand spring coil with a certain degree of elasticity, which protects the optical fiber lens and drives the optical fiber lens to rotate, enabling the optical fiber lens to scan the tube wall 360°. To achieve ideal diagnostic and treatment results, the length of the torsion control coil in the OCT imaging probe is usually not less than 1400mm, exhibiting a slender shape. Traditional technology directly uses the same material to mold the entire torsion control coil. Utility Model Content
[0004] The main purpose of this invention is to propose an OCT slender catheter and OCT diagnostic and therapeutic device, which aims to provide a new molding method for a slender torsion control coil.
[0005] To achieve the above objectives, this utility model proposes an OCT slender conduit, including an insertion tube for covering optical fibers. The insertion tube includes at least two torsion control tube segments arranged sequentially from near to far, and a docking structure. The docking structure is fixedly connected between the at least two torsion control tube segments to divide the two torsion control tube segments into a first torsion control tube segment located in front of it and a second torsion control tube segment located behind it.
[0006] The stiffness of the docking structure is at least greater than the stiffness of the second torsion control pipe section.
[0007] Optionally, the docking structure includes two mounting parts that correspond one-to-one with the two torque control pipe segments connected thereto;
[0008] One of the mounting part and the corresponding torque control tube section is provided with a protrusion, and the other is provided with a concave part. The protrusion and the concave part are inserted and fixed together.
[0009] Optionally, the outer diameter of the connection between the mounting part and the corresponding torsion control pipe section is D1, and the outer diameter of the adjacent torsion control pipe section is D2, where D1 and D2 are equivalent.
[0010] Optionally, the docking structure and the torsion control pipe segment are fixed by welding and / or bonding.
[0011] Optionally, the elastic modulus of the first torsion control tube segment is greater than that of the second torsion control tube segment.
[0012] Optionally, the first torsion control tube segment is made of a rigid material and is a dense, thin-walled tube.
[0013] The outer diameter of the first torsion control tube segment gradually decreases from near to far.
[0014] Optionally, the proximal outer diameter of the first torsion control tube segment is not less than 0.3 mm and not more than 0.7 mm; and / or,
[0015] The difference between the maximum and minimum outer diameter of the first torsion control pipe section does not exceed 35%.
[0016] Optionally, the second torsion control tube segment is made of at least two layers of spring coils wound together, and the number of strands of each layer of spring coils is not less than 6 and not more than 16.
[0017] Optionally, the first torsion control tube segment and the second torsion control tube segment are each made of at least two layers of spring coils wound together, and the number of strands of each layer of spring coils is not less than 6 and not more than 16.
[0018] Wherein, the sag of the first torsion control tube segment is less than that of the second torsion control tube segment, and the tensile modulus of the first torsion control tube segment is greater than that of the second torsion control tube segment.
[0019] In addition, to achieve the above objectives, this utility model also provides an OCT diagnostic and therapeutic device, including an OCT slender catheter. The OCT slender catheter includes an insertion tube for covering an optical fiber. The insertion tube includes at least two torsion control tube segments arranged sequentially from proximal to distal, and a docking structure. The docking structure is fixedly connected between the at least two torsion control tube segments to divide the two torsion control tube segments into a first torsion control tube segment located on its anterior side and a second torsion control tube segment located on its posterior side.
[0020] The stiffness of the docking structure is at least greater than the stiffness of the second torsion control pipe section.
[0021] In the technical solution provided by this utility model, by dividing the insertion tube into at least two torsion control tube segments, the forming process of each torsion control tube segment is simpler and the forming quality is higher. Since each torsion control tube segment is formed independently, the performance of each torsion control tube segment can be differentiated according to actual needs, thereby effectively adjusting the overall torsion ratio of the insertion tube from near to far. In addition, the docking structure can strengthen the connection strength between the first and second torsion control tube segments, and since the stiffness of the docking structure is greater than that of the second torsion control tube segment, the loss when the power of the first torsion control tube segment is transmitted to the second torsion control tube segment through the docking structure is smaller. Especially when the insertion tube is long, it helps to maintain the stability of the torsion ratio of the insertion tube from near to far, thereby helping to improve the overall forming quality of the insertion tube. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0023] Figure 1 A schematic diagram of the first embodiment of the OCT slender catheter provided by this utility model;
[0024] Figure 2 for Figure 1 Enlarged structural diagram at point A;
[0025] Figure 3 for Figure 1 A schematic diagram of the first torsion control pipe section, the docking structure, and the second torsion control pipe section before assembly;
[0026] Figure 4 A schematic diagram of the second embodiment of the OCT slender catheter provided by this utility model;
[0027] Figure 5 for Figure 4 Enlarged structural diagram at point B;
[0028] Figure 6 for Figure 4 A schematic diagram of the first torsion control pipe section, the docking structure, and the second torsion control pipe section before assembly.
[0029] Explanation of icon numbers:
[0030] 100 Fiber optic body; 200 External tube; 300 Insertion tube; 310 First torsion control tube section; 320 Second torsion control tube section; 330 Docking structure; 331 First mounting part; 332 Connecting part; 333 Second mounting part; 341 First protrusion; 342 First concave part; 343 Second protrusion; 344 Second concave part; 400 Fiber optic probe.
[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] It should be noted that if the embodiments of this utility model 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.
[0034] Furthermore, if the embodiments of this utility model 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 utility model.
[0035] Please see Figures 1 to 6 This invention provides an OCT slender catheter and the optical coherence tomography (OCT) diagnostic instrument used therein. The OCT diagnostic instrument can be, but is not limited to, diagnostic instruments used in ophthalmology, cardiology, dermatology, dentistry, and other medical fields.
[0036] In practical applications, OCT slender catheters are generally elongated and have a proximal end for connecting to the drive device in optical coherence tomography (OCT) diagnostic instruments, and a distal end away from the drive device. From proximal to distal, the OCT slender catheter typically includes a fiber optic body 100, an external tube 200, and an insertion tube 300. The OCT slender catheter also includes an optical fiber; the proximal end of the optical fiber is connected to the fiber optic body 100, and the distal end of the optical fiber forms a fiber optic probe 400. The fiber optic probe 400 passes through the external tube 200 and the insertion tube 300 sequentially, and is exposed on one side wall of the distal section of the insertion tube 300. This allows the fiber optic probe 400 to rotate circumferentially when the drive device rotates the external tube 200 and the insertion tube 300.
[0037] In practical applications, the external tube 200 is generally placed outside the patient's body, while the insertion tube 300 is inserted into the patient's body. The rigidity of the external tube 200 is generally greater than that of the insertion tube 300. In this way, under the drive of the driving device, the external tube 200 pushes the insertion tube 300 into the patient's body in a relatively straight position; and during retraction, the external tube 200 facilitates smoother retraction of the fiber optic probe 400.
[0038] In view of the above, specifically, the OCT slender catheter provided by this utility model includes an insertion tube 300, the insertion tube 300 includes at least two torsion control tube segments arranged sequentially from proximal to distal, and a docking structure 330, the docking structure 330 being fixedly connected between the at least two torsion control tube segments to divide the two torsion control tube segments into a first torsion control tube segment 310 located on its front side and a second torsion control tube segment 320 located on its rear side; wherein, the stiffness of the docking structure 330 is at least greater than the stiffness of the second torsion control tube segment 320.
[0039] In the technical solution provided by this utility model, by dividing the insertion tube 300 into at least two torsion control tube segments, the forming process of each torsion control tube segment is simpler and the forming quality is higher. Since each torsion control tube segment is formed independently, the performance of each torsion control tube segment can be differentiated according to actual needs, thereby effectively adjusting the overall torsion ratio of the insertion tube 300 from near to far. In addition, the docking structure 330 can strengthen the connection strength between the first torsion control tube segment 310 and the second torsion control tube segment 320. Since the stiffness of the docking structure 330 is greater than that of the second torsion control tube segment 320, the loss is smaller when the power of the first torsion control tube segment 310 is transmitted to the second torsion control tube segment 320 through the docking structure 330. Especially when the insertion tube 300 is long, it helps to maintain the stability of the torsion ratio of the insertion tube 300 from near to far, thereby helping to improve the overall forming quality of the insertion tube 300.
[0040] In this design, the various torsion control pipe segments are arranged sequentially from near to far, and are set up coaxially as much as possible. That is, in the natural extension state, the central axes of each torsion control pipe segment are as collinear as possible.
[0041] The channels running through each twist control tube segment allow for the flexible insertion of optical fibers. Depending on actual needs, the radial cross-sectional area of the channel segments defined by each twist control tube segment can be set to the same value. Alternatively, at least two twist control tube segments may define channel segments with different radial cross-sectional areas. A step will be formed between the channel segment with the smaller radial cross-sectional area and its adjacent channel segment with the larger radial cross-sectional area. Furthermore, the step surface can be inclined to form an flared or constricted opening, which helps to provide good guidance during fiber insertion and removal.
[0042] The setting length of each torsion control pipe section can be set to be the same, or, according to actual needs, at least two of the torsion control pipe sections can be set to different lengths.
[0043] There is no limit to the specific number of torsion control tube segments. However, it can be understood that a larger number of torsion control tube segments allows for greater flexibility in adjusting the torsion ratio, but also increases the molding complexity of the entire insertion tube 300 and makes it easier to reduce molding efficiency. Conversely, a smaller number of torsion control tube segments results in lower molding complexity for the entire insertion tube 300 and easier to improve molding efficiency, but reduces the flexibility in adjusting the torsion ratio. Therefore, in practical applications, the number of torsion control tube segments should not be too many or too few, and can be set between two and four.
[0044] It should be noted that when there are two torsion control segments, the first torsion control segment 310 and the second torsion control segment 320 can be uniquely and accurately defined. However, when there are three or more torsion control segments, the first torsion control segment 310 can be any torsion control segment located near the second torsion control segment 320; conversely, the second torsion control segment 320 can be any torsion control segment located far from the first torsion control segment 310. That is, for example, when there are four torsion control segments, and the second torsion control segment 320 is the fourth torsion control segment from near to far, then the first, second, and third torsion control segments can all selectively constitute the first torsion control segment 310.
[0045] It is understandable that the performance parameters of each torsion control segment mentioned above can be set to be the same. Taking the elastic modulus as an example, the elastic modulus of each torsion control segment can be set to be the same. Alternatively, in a further embodiment, the elastic modulus of the first torsion control segment 310 can be set to be greater than that of the second torsion control segment 320, which means that the rotational stiffness of the first torsion control segment 310 is greater than that of the second torsion control segment 320. This results in the first torsion control segment 310 having a greater ability to resist rotational deformation than the second torsion control segment 320 during rotation. In this way, the power transmission loss at the first torsion control segment 310 can be reduced compared to the power transmission loss at the second torsion control segment 320, thus achieving the purpose of adjusting the torsion ratio.
[0046] However, to achieve better adjustment of the torsion ratio, in a further design, the elastic modulus of each torsion control segment decreases progressively from proximal to distal. This means that in every two adjacent torsion control segments, the elastic modulus of the proximal segment is greater than that of the distal segment. It should be noted that the decrease in elastic modulus of each torsion control segment from proximal to distal can be the same; or the decrease can be different. When the decreases are different, they can exhibit a regular decrease, increase, or abrupt change from proximal to distal, without restriction, and can be specifically adjusted according to the actual functional requirements of the OCT slender catheter in practical applications.
[0047] In view of the above, for ease of understanding, in the following embodiments, unless otherwise specified, the specific configuration of the torque control pipe segment is set to two as an example.
[0048] Specifically, the structure of the second torsion control section 320 can be configured using existing technology. Alternatively, in one embodiment, the second torsion control section 320 is made of at least two layers of spring coils wound together, and the number of wire strands in each layer of spring coils is not less than 6 and not more than 16. The spring coils in the second torsion control section 320 can be specifically set to two or three layers, but not too many, as this can easily increase the molding burden.
[0049] Furthermore, when the second torsion control section 320 is specifically made of two layers of spring coils, the two layers of spring coils are an inner spring coil and an outer spring coil, respectively. Optionally, the number of strands of the inner spring coil and the outer spring coil are set to be the same, for example, both are set to 8 strands, or both are set to 9 strands.
[0050] When the second torsion control section 320 is specifically made of three layers of spring coils, the three layers of spring coils are an inner spring coil, a middle spring coil, and an outer spring coil. Optionally, the number of strands in the inner and middle spring coils is the same, and the number of strands in the outer spring coil is greater than that in the inner and middle spring coils. For example, the number of strands in the inner, middle, and outer spring coils are set to 8, 8, and 12 strands, respectively. Alternatively, the number of strands in the inner, middle, and outer spring coils can be set to 9, 9, and 12 strands, respectively.
[0051] In this way, while ensuring a high torsion ratio, the flexible structure of the second torsion control section 320 facilitates the passage of the OCT slender catheter through tortuous blood vessels and reduces irritation to the blood vessels.
[0052] Regarding the structural design of the first torsion control section 310:
[0053] In one application, the first torsion control segment 310 is made of a rigid material and is a dense, thin-walled tubular structure. The rigid material refers to a material whose rigidity is at least greater than that of the material used to make the second torsion control segment 320. Specifically, it could be made of materials such as 304 stainless steel, 316 stainless steel, or nickel-titanium alloy, which helps to provide a higher torsion ratio and pushing force. The dense structure of the tube wall of the first torsion control segment 310 means that the components of the tube wall are arranged very closely, with almost no gaps or very small gaps, which helps to improve its structural strength, thereby increasing its elastic modulus and rotational stiffness. The purpose of making the tube wall of the first torsion control segment 310 relatively thin is to further ensure that the first torsion control segment 310 is elastic and that its elasticity meets the usage requirements by reducing the thickness of the tube wall based on the above structural design.
[0054] The outer diameter of the first torsion control section 310 can be set to be the same from near to far. Alternatively, in a further embodiment, the outer diameter of the first torsion control section 310 is gradually reduced from near to far. Setting the outer diameter of the near section of the first torsion control section 310 to be larger helps to improve the torsion ratio and pushing force of the near section of the first torsion control section 310; while setting the outer diameter of the far section of the first torsion control section 310 to be smaller helps to facilitate a smooth transition between the far section of the first torsion control section 310 and the near section of the second torsion control section 320.
[0055] Specifically, the proximal outer diameter of the first torsion control segment 310 is not less than 0.3 mm and not more than 0.7 mm; and / or the difference between the maximum and minimum outer diameters of the first torsion control segment 310 does not exceed 35%. This helps to ensure that the overall strength and elasticity of the first torsion control segment 310 meet the needs of actual diagnostic and treatment operations.
[0056] In another application, the first torsion control section 310 can also be made of at least two layers of spring coils wound together, with each layer of spring coils having a number of strands of not less than 6 and not more than 16.
[0057] Similarly, the spring coil in the first torsion control section 310 can be specifically configured as two or three layers, but not too many, as this can easily increase the molding burden. When the first torsion control section 310 is specifically made by winding two layers of spring coils, the two layers of spring coils are respectively the inner spring coil and the outer spring coil. Optionally, the number of strands of the inner spring coil and the outer spring coil are set to be the same, for example, both are set to 8 strands, or both are set to 9 strands. When the first torsion control section 310 is specifically made by winding three layers of spring coils, the three layers of spring coils are respectively the inner spring coil, the middle spring coil, and the outer spring coil. Optionally, the number of strands of the inner spring coil and the middle spring coil are set to be the same, and the number of strands of the outer spring coil is set to be greater than the number of strands of the inner spring coil and the middle spring coil. Specifically, for example, the inner, middle, and outer spring coils can be configured with 8, 8, and 12 strands of wire, respectively. Alternatively, the inner, middle, and outer spring coils can be configured with 9, 9, and 12 strands of wire, respectively. This ensures a high torsion ratio while allowing the flexible structure of the first torsion-controlled section 310 to facilitate the passage of the slender OCT catheter through tortuous blood vessels and reduce irritation to the vessels.
[0058] When both the first torsion control section 310 and the second torsion control section 320 are made by winding at least two layers of spring coils as described above, in order to achieve a greater elastic modulus for the first torsion control section 310 than for the second torsion control section 320, in a further embodiment, the sag of the first torsion control section 310 is less than that of the second torsion control section 320, and the tensile modulus of the first torsion control section 310 is greater than that of the second torsion control section 320. In actual operation, the first torsion control section 310 and the second torsion control section 320 with different sags and tensile moduli can be formed by adjusting the winding preload and heat treatment parameters during the processing.
[0059] Based on one or more of the above embodiments, it can be understood that each pair of adjacent torsion control pipe segments is indirectly connected and fixed through a mating structure 330:
[0060] It is understood that the performance and other characteristics of the docking structure 330 can be set to be the same as those of the first torque control section 310, or the same as those of the second torque control section 320, or different from both the first torque control section 310 and the second torque control section 320. Specifically, when the performance and other characteristics of the docking structure 330 are set to be different from both the first torque control section 310 and the second torque control section 320, it can be any state value between the first torque control section 310 and the second torque control section 320.
[0061] To ensure that the stiffness of the docking structure 330 is at least greater than that of the second torsion control section 320, the docking structure 330 can be made of a metal material with a certain strength, such as 304 stainless steel, 316 stainless steel, or nickel-titanium alloy.
[0062] To better achieve the connection between the docking structure 330 and the two adjacent torsion control pipe segments, the docking structure 330 specifically includes two mounting parts, each corresponding to one of the two torsion control pipe segments on both sides. Similarly, the mounting parts and the torsion control pipe segments can be directly welded and / or bonded together via their end surfaces. Alternatively, in one embodiment, one of the mounting parts and the corresponding torsion control pipe segment has a protrusion, and the other has a recess, with the protrusion and recess being inserted and fixed together.
[0063] Specifically, taking the first torsion control pipe section 310 and the second torsion control pipe section 320 as examples, the two mounting parts are a first mounting part 331 connected to the first torsion control pipe section 310 and a second mounting part 333 connected to the second torsion control pipe section 320. Wherein:
[0064] In one embodiment, one of the first mounting portion 331 and the first torque control tube segment 310 is provided with a first protrusion 341, and the other is provided with a first recess 342, wherein the first protrusion 341 and the first recess 342 are inserted and fixed. And / or in one embodiment, one of the second mounting portion 333 and the second torque control tube segment 320 is provided with a second protrusion 343, and the other is provided with a second recess 344, wherein the second protrusion 343 and the second recess 344 are inserted and engaged.
[0065] For example Figure 3As shown, when the first torsion control tube segment 310 is made of a rigid material and has a dense, thin-walled tube wall, a first recess 342 can be provided at the first torsion control tube segment 310, and a first protrusion 341 can be provided at the first mounting portion 331. Specifically, the first protrusion 341 can be, for example, a step formed by grinding. The insertion and fixing of the first protrusion 341 and the first recess 342 helps to achieve a stable connection between the first torsion control tube segment 310 and the first mounting portion 331, and also facilitates the coaxial installation of the first torsion control tube segment 310 and the first mounting portion 331. Similarly, a second protrusion 343 can be provided at the second torsion control tube segment 320, and a second recess 344 can be provided at the second mounting portion 333. Specifically, the second protrusion 343 can be, for example, a step formed by grinding. The insertion and fixing of the second protrusion 343 and the second recess 344 helps to achieve a stable connection between the second torque control tube section 320 and the second mounting part 333, and also helps to achieve coaxial installation of the second torque control tube section 320 and the second mounting part 333.
[0066] Specifically, such as Figure 6 As shown, when the first torsion control tube segment 310 is made of at least two layers of spring coils wound together, a first protrusion 341 can be provided at the first torsion control tube segment 310, and a first recess 342 can be provided at the first mounting portion 331. The insertion and fixing of the first protrusion 341 and the first recess 342 helps to achieve a stable connection between the first torsion control tube segment 310 and the first mounting portion 331, and also facilitates the coaxial installation of the first torsion control tube segment 310 and the first mounting portion 331. Similarly, a second protrusion 343 can be provided at the second torsion control tube segment 320, and a second recess 344 can be provided at the second mounting portion 333. The insertion and fixing of the second protrusion 343 and the second recess 344 helps to achieve a stable connection between the second torsion control tube segment 320 and the second mounting portion 333, and also facilitates the coaxial installation of the second torsion control tube segment 320 and the second mounting portion 333.
[0067] It should be noted that when the outer diameter of the connection between the mounting part and the corresponding torsion control pipe section is D1, and the outer diameter of the adjacent torsion control pipe section is D2, D1 and D2 are equivalent. Equivalent means that D1 and D2 are exactly equal, or the deviation between D1 and D2 is within a preset deviation threshold range. Specifically, for example, when the first mounting part 331 and the first torsion control pipe section 310 are connected, the outer diameter of the connection point between them is D1, and the outer diameter of the pipe section of the first torsion control pipe section 310 adjacent to the connection point is D2. This ensures that a large outer diameter is not formed at the connection point between the mounting part and the torsion control pipe section, avoiding structural interference and preventing the overall size of the insertion tube 300 from being too large.
[0068] Furthermore, after the protrusions and recesses are provided as described above, optionally, welding and / or bonding can be performed at the connection between the mounting part and the corresponding torsion control pipe section. When welding is performed, laser welding can be selected. When bonding is performed, cyanoacrylate or epoxy resin curing adhesive can be selected.
[0069] The first mounting portion 331 and the second mounting portion 333 described above can be directly connected and fixed. The connection and fixing method can be integral molding, or it can be separately molded and then connected in a detachable or non-detachable manner. Furthermore, the docking structure 330 may also include a connecting portion 332 disposed between the first mounting portion 331 and the second mounting portion 333. Among the first mounting portion 331, the connecting portion 332, and the second mounting portion 333, each pair can be integrally molded, or they can be separately molded and then connected in a detachable or non-detachable manner.
[0070] Specifically, the outer diameter of the connecting portion 332 is adapted to transition between the outer diameters of the first torsion control pipe section 310 and the second torsion control pipe section 320 to which it is connected. That is, when the outer diameters of the pipe sections adjacent to the first torsion control pipe section 310 and the second torsion control pipe section 320 are approximately the same, the outer diameter of the connecting portion 332 is set to be the same as the above two, so that the connection point of the three is approximately straight. When the outer diameters of the pipe sections adjacent to the first torsion control pipe section 310 and the second torsion control pipe section 320 are different, the outer diameter of the connecting portion 332 is adapted to be a slope or arc surface that corresponds to the difference in their outer diameters.
[0071] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A slender OCT catheter, characterized in that, The device includes an insertion tube for covering optical fibers, the insertion tube comprising at least two torsion control tube segments arranged sequentially from near to far, and a docking structure fixedly connected between the at least two torsion control tube segments to divide the two torsion control tube segments into a first torsion control tube segment located in front of it and a second torsion control tube segment located behind it. The stiffness of the docking structure is at least greater than the stiffness of the second torsion control pipe section.
2. The OCT slender catheter as described in claim 1, characterized in that, The docking structure includes two mounting parts that are provided for the two torsion control pipe segments that are connected to it one by one; One of the mounting part and the corresponding torque control tube section is provided with a protrusion, and the other is provided with a concave part. The protrusion and the concave part are inserted and fixed together.
3. The OCT slender catheter as described in claim 2, characterized in that, The outer diameter of the connection between the mounting part and the corresponding torsion control pipe section is D1, and the outer diameter of the adjacent torsion control pipe section is D2, with D1 and D2 being equivalent.
4. The OCT slender catheter as described in claim 1, characterized in that, The docking structure and the torsion control pipe section are fixed by welding and / or bonding.
5. The OCT elongated catheter as described in any one of claims 1 to 4, characterized in that, The elastic modulus of the first torsion control tube segment is greater than that of the second torsion control tube segment.
6. The OCT slender catheter as described in claim 5, characterized in that, The first torsion control tube segment is made of a rigid material and is a dense, thin-walled tube. The outer diameter of the first torsion control tube segment gradually decreases from near to far.
7. The OCT slender catheter as described in claim 6, characterized in that, The proximal outer diameter of the first torsion control tube segment is not less than 0.3 mm and not more than 0.7 mm; and / or, The difference between the maximum and minimum outer diameter of the first torsion control pipe section does not exceed 35%.
8. The OCT elongated catheter as described in claim 6, characterized in that, The second torsion control tube section is made of at least two layers of spring coils wound together, and the number of strands of each layer of spring coils is not less than 6 and not more than 16.
9. The OCT slender catheter as described in claim 5, characterized in that, Both the first torsion control tube segment and the second torsion control tube segment are made of at least two layers of spring coils wound together, and the number of strands of each layer of spring coils is not less than 6 and not more than 16. Wherein, the sag of the first torsion control tube segment is less than that of the second torsion control tube segment, and the tensile modulus of the first torsion control tube segment is greater than that of the second torsion control tube segment.
10. An OCT diagnostic device, characterized in that, Including the OCT elongated catheter as described in any one of claims 1 to 9.