Endoscope catheter suitable for ERCP

Abstract

The endoscope catheter comprises an end cap, a steel sleeve assembly and a sleeve, the end cap comprises a body part and a connecting part which are connected with each other, the steel sleeve assembly comprises a steel pipe and a steel block located in the steel pipe, and the sleeve comprises a multi-cavity hose and a film covering pipe arranged on the peripheral side of the multi-cavity hose. The body part, the connecting part, the steel block and the multi-cavity hose are sequentially connected to form a communicated working channel, the steel pipe is arranged on the peripheral side of the connecting part and the peripheral side of the steel block, and the multi-cavity hose is close to the peripheral side of the end of the steel block. The far end of the endoscope catheter is connected with the end cap and the sleeve through the steel sleeve assembly, the multi-cavity hose is bent towards one side when being extruded through the steel sleeve assembly, and therefore the bending function of the far end of the endoscope catheter is achieved. Different from a snake bone bending structure in the prior art, the multi-cavity hose can be formed by extruding a high polymer material with small hardness and high elasticity, the multi-cavity hose can rebound after being bent, and permanent damage is not prone to being generated.

Description

Technical Field

[0001] The utility model belongs to the field of optical imaging, and more specifically, relates to an endoscope catheter applicable to ERCP. Background Art

[0002] As a rapidly developing medical technology in recent years, the endoscope plays an extremely crucial role in the clinical diagnosis and treatment process. The endoscope system generally includes a camera system, an illumination system, a control system, a processing system, etc.

[0003] In the prior art, the manipulation of the distal end of the endoscope mainly uses the snake bone method, which has the advantages of good flexibility and large bending angle in clinical fields such as urology and respiration. However, in more complex ERCP applications, since the endoscope needs to be squeezed by the biopsy forceps of the duodenoscope, the snake bone may be deformed and damaged, resulting in the failure of the endoscope function. Summary of the Utility Model

[0004] In view of the above defects or improvement requirements of the prior art, the utility model provides an endoscope catheter applicable to ERCP, aiming to solve the problem of deformation and damage caused by the easy extrusion of the operation part when the existing endoscope passes through the duodenoscope.

[0005] To achieve the above object, according to one aspect of the utility model, there is provided an endoscope catheter applicable to ERCP, including an end cap, a steel sleeve assembly and a sleeve. The end cap includes a body part and a connecting part connected to each other. The steel sleeve assembly includes a steel pipe and a steel block located inside the steel pipe. The sleeve includes a multi-lumen hose and a film-coated pipe provided on the outer peripheral side of the multi-lumen hose. The body part, the connecting part, the steel block and the multi-lumen hose are connected in sequence to form a communicating working channel. The steel pipe is arranged on the peripheral side of the connecting part, the peripheral side of the steel block, and the peripheral side of the end of the multi-lumen hose close to the steel block.

[0006] Through the above technical solution, the distal end of the endoscope catheter connects the end cap and the sleeve through the steel sleeve assembly, and the multi-lumen hose is bent to one side when being squeezed through the steel sleeve assembly, so as to realize the bending function of the distal end of the endoscope catheter. Different from the snake bone bending structure in the prior art, the multi-lumen hose of this application can be extruded and formed by using a polymer material with low hardness and strong elasticity, and the multi-lumen hose will rebound after bending and is not easy to cause permanent damage.

[0007] Further, a spring is provided in the working channel inside the multi-lumen hose.

[0008] Further, the outer diameter of the connecting part is smaller than the inner diameter of the steel pipe, and a glue storage groove is provided on the outer peripheral side of the connecting part.

[0009] Further, the outer diameter of the body portion of the end cap is equal to the outer diameter of the steel pipe, and the outer diameter of the coated film tube is greater than the inner diameter of the steel pipe and less than the outer diameter of the steel pipe.

[0010] Further, a camera module channel and a lighting channel are provided in the body portion of the end cap. The lighting channels are symmetrically arranged on both sides of the camera module channel, and a transition channel communicating with both the camera module channel and the lighting channel is provided in the steel block.

[0011] Further, the body portion, the connecting portion, the steel block, and the multi-chamber hose are sequentially connected to form a connected flushing channel, which is symmetrically arranged on both sides of the working channel.

[0012] Further, in one end face of the body portion of the end cap away from the connecting portion, the part provided with the camera module channel and the lighting channel is a plane, and the part provided with the working channel and the flushing channel is an arc surface.

[0013] Further, the steel block and the multi-chamber hose are connected to form a connected steel wire channel.

[0014] Further, a double concave lens is provided at one end of the lighting channel away from the steel block.

[0015] Generally speaking, the present utility model has the following advantages:

[0016] (1) Using a multi-chamber hose to replace the snake bone for bending. After the multi-chamber hose is bent, it will rebound and is not prone to permanent damage.

[0017] (2) Using a steel sleeve assembly to squeeze the multi-chamber tube to achieve bending drive. At the same time, the steel block in the steel sleeve assembly connects the end cap and each channel in the multi-chamber hose, and the lighting component in the lighting channel and the camera component in the camera module channel can be integrated into one transition channel in the steel block and then into one channel in the multi-chamber hose. This is convenient for reducing the wall thickness of the channels in the multi-chamber tube and making the entire endoscope catheter have a smaller outer diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0019] Figure 2 is a schematic overall structure diagram of the present utility model after removing the steel pipe;

[0020] Figure 3 is a schematic overall structure diagram of the end cap;

[0021] Figure 4 is a schematic overall structure diagram of the steel sleeve assembly;

[0022] Figure 5It is a schematic cross-sectional structure diagram of the end cap.

[0023] In the figure, 11 is the main body part; 12 is the connecting part; 121 is the glue storage groove; 21 is the steel pipe; 22 is the steel block; 221 is the transition channel; 31 is the multi-chamber hose; 32 is the film-coated pipe; 4 is the working channel; 41 is the spring; 5 is the camera module channel; 6 is the lighting channel; 61 is the light inlet concave surface; 62 is the light outlet concave surface; 7 is the flushing channel; 8 is the steel wire channel. Specific embodiments

[0024] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] As Figure 1 and Figure 2 shown, the present invention provides an endoscope catheter applicable to ERCP, which includes an end cap, a steel sleeve assembly and a sleeve. The end cap includes a main body part 11 and a connecting part 12 that are connected to each other. The steel sleeve assembly includes a steel pipe 21 and a steel block 22 located inside the steel pipe 21. The sleeve includes a multi-chamber hose 31 and a film-coated pipe 32 provided on the outer peripheral side of the multi-chamber hose 31. The main body part 11, the connecting part 12, the steel block 22, and the multi-chamber hose 31 are connected in sequence to form a connected working channel 4. The steel pipe 21 is arranged on the peripheral side of the connecting part 12, the peripheral side of the steel block 22, and the peripheral side of the end of the multi-chamber hose 31 close to the steel block 22.

[0026] The distal end of the endoscope catheter is connected to the end cap and the sleeve through the steel sleeve assembly, and the multi-chamber hose 31 is bent to one side when being squeezed through the steel sleeve assembly, so as to realize the bending function of the distal end of the endoscope catheter. Different from the snake bone bending structure in the prior art, the multi-chamber hose 31 of the present application can be extruded and formed using a polymer material with low hardness and strong elasticity. After the multi-chamber hose 31 is bent, it will rebound and is not easily permanently damaged.

[0027] Furthermore, a spring 41 is provided in the working channel 4 inside the multi-chamber hose 31. In some embodiments, a spring 41 tube can be prefabricated through a thermal coating process and then integrated with the wall of the multi-chamber hose 31. By providing the spring 41 in the working channel 4 inside the multi-chamber hose 31, when the multi-chamber hose 31 is bent, the deformation force generated by the spring 41 can counteract the deformation of the working channel 4 caused by the extrusion of the multi-chamber hose 31, thereby improving the instrument passing performance of the working channel 4.

[0028] Specifically, the outer diameter of the connecting portion 12 is smaller than the inner diameter of the steel pipe 21, and a glue storage groove 121 is provided on the outer peripheral side of the connecting portion 12. When installing the end cap, glue is filled in the glue storage groove 121 on the circumferential side of the connecting portion 12, and then the connecting portion 12 is inserted into the steel pipe 21, so that the connection between the end cap and the steel sleeve assembly can be realized.

[0029] The outer diameter of the main body portion 11 of the end cap is equal to the outer diameter of the steel pipe 21, and the outer diameter of the film-coated tube 32 is larger than the inner diameter of the steel pipe 21 and smaller than the outer diameter of the steel pipe 21. When the connecting portion 12 of the end cap is inserted into the steel pipe 21 and bonded and cured, the outer peripheral side of the main body portion 11 of the end cap is flush with the outer peripheral side of the steel pipe 21, and the surface of the connection between the two is smooth without steps, facilitating passage. The film-coated tube 32 is wrapped around the outer peripheral side of the multi-cavity hose 31, and the steel pipe 21 is also provided on the peripheral side of the end of the multi-cavity hose 31 close to the steel block 22. The diameter setting of the film-coated tube 32 can achieve: by inserting the end of the multi-cavity hose 31 into the steel pipe 21, the steel pipe 21 simultaneously presses the film-coated tube 32 on the peripheral side of the multi-cavity hose 31, so that the connection between the steel pipe 21 and the multi-cavity hose 31 is sealed and fitted.

[0030] Further, as Figure 3 and Figure 4 shown, a camera module channel 5 and a lighting channel 6 are provided in the main body portion 11 of the end cap. The lighting channels 6 are symmetrically arranged on both sides of the camera module channel 5, and a transition channel 221 communicating with both the camera module channel 5 and the lighting channel 6 is provided in the steel block 22. In some embodiments, the camera module channel 5 is a square channel, and the lighting channels 6 are two circular channels and are symmetrically distributed on both sides of the square channel. Through the setting in the steel block 22, the lighting components in the lighting channels 6 and the camera components in the camera module channel 5 can be integrated into one transition channel 221 in the steel block 22, and then into one channel in the multi-cavity hose 31. It is convenient to reduce the wall thickness of the channels in the multi-cavity tube, make the entire endoscope catheter have a smaller outer diameter, and reduce the discomfort of the patient during use.

[0031] Further, the main body portion 11, the connecting portion 12, the steel block 22, and the multi-cavity hose 31 are connected in sequence to further form a communicating flushing channel 7, and the flushing channel 7 is symmetrically arranged on both sides of the working channel 4. The flushing channel 7 can provide a liquid flushing function for the camera components in the camera module channel 5 to ensure the clarity of the observation position.

[0032] Furthermore, in the end face of one side of the body portion 11 of the end cap away from the connection portion 12, the portion where the camera module channel 5 and the lighting channel 6 are provided is a plane, and the portion where the working channel 4 and the flushing channel 7 are provided is a curved surface. The end face of one side of the body portion 11 of the end cap away from the connection portion 12 is the observation end face of the entire endoscope catheter, and the portion where the camera module channel 5 and the lighting channel 6 are provided is a plane, which is convenient for the camera component to protrude from the camera module channel 5 and perform imaging, and for the lighting component to perform lighting assistance during the imaging process. The portion where the working channel 4 and the flushing channel 7 are provided is a curved surface, which will not protrude from the plane, so the working channel 4 and the flushing channel 7 will not cause occlusion or other effects on the operation of the camera component and the lighting component. In addition, the design of the curved surface can make the surface of the end cap smooth to avoid damage to tissue mucosa.

[0033] Furthermore, the steel block 22 and the multi-lumen hose 31 are connected to form a connected steel wire channel 8. The steel wire channel 8 ends in the steel block 22, and the end of the steel wire is fixed in the steel block 22. The operator can pull the steel block 22 to move by pulling the steel wire, so that the multi-lumen tube is squeezed and bent. In some embodiments, there can be four steel wire channels 8, which are symmetrically distributed around the circumference, so that the multi-lumen hose 31 can be pulled and bent at multiple angles.

[0034] Furthermore, if Figure 5 As shown, a biconcave lens is provided in the lighting channel 6 at one end away from the steel block 22. The biconcave lens includes a light-inlet concave surface 61 and a light-outlet concave surface 62, and the curvature radius of the light-inlet concave surface 61 is smaller than the curvature radius of the light-outlet concave surface 62. A biconcave lens is provided at the lighting outlet in the lighting channel 6, where the lighting light will be refracted twice by the light-inlet concave surface 61 and the light-outlet concave surface 62 in sequence, and because the curvature radius of the light-inlet concave surface 61 is smaller than the curvature radius of the light-outlet concave surface 62, the divergence angle of the lighting light after the two refractions will increase, thereby covering the entire field of view within the depth of field range and meeting the lighting requirements at the far end.

[0035] The lighting channel 6 is a non-through hole, and the biconcave lens is integrally formed with the end cap. The lighting channel 6 is a non-through hole, so the light inlet and light outlet sides are processed at the non-through portion to form a biconcave lens integrally formed with the end cap. Compared with custom-processing a biconcave lens and then installing and fixing it in the lighting channel 6, the integrated design has higher precision and lower implementation difficulty.

[0036] The center thickness of the biconcave lens is not less than 0.1 mm. Since the biconcave lens is integrally formed with the end cap, controlling its center thickness can ensure the structural strength of the end cap.

[0037] A plastic optical fiber is adhesively bonded to the light incident concave surface 61 side in the lighting channel 6. The bonding and grinding processes of glass optical fibers are complex, and wire breakage is likely to occur during the processing, affecting the final lighting effect. The present utility model uses a plastic optical fiber, which can reduce the cost of the endoscope and improve the manufacturability. However, the divergence angle of the plastic optical fiber is only 70°, but under the double refraction of the double concave lens, the divergence angle can be increased, so as to match the camera module with a large field of view angle.

[0038] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An endoscope catheter applicable to ERCP, characterized in that, It includes an end cap, a steel sleeve assembly and a casing. The end cap includes a body part and a connecting part connected to each other. The steel sleeve assembly includes a steel pipe and a steel block located inside the steel pipe. The casing includes a multi-chamber hose and a film-coated pipe provided on the outer peripheral side of the multi-chamber hose. The body part, the connecting part, the steel block and the multi-chamber hose are connected in sequence to form a connected working channel. The steel pipe is arranged on the peripheral side of the connecting part, the peripheral side of the steel block and the peripheral side of the end of the multi-chamber hose close to the steel block.

2. The endoscopic catheter according to claim 1, characterized in that, A spring is provided in the working channel in the multi-chamber hose.

3. The endoscope catheter according to claim 2, wherein, The outer diameter of the connecting part is smaller than the inner diameter of the steel pipe, and a glue storage groove is provided on the outer peripheral side of the connecting part.

4. The endoscope catheter according to claim 3, characterized in that, The outer diameter of the body part of the end cap is equal to the outer diameter of the steel pipe, and the outer diameter of the film-coated pipe is larger than the inner diameter of the steel pipe and smaller than the outer diameter of the steel pipe.

5. The endoscope catheter according to claim 2, characterized in that, A camera module channel and a lighting channel are provided in the body part of the end cap. The lighting channels are symmetrically arranged on both sides of the camera module channel. A transition channel communicating with both the camera module channel and the lighting channel is provided in the steel block.

6. The endoscope catheter according to claim 5, characterized in that, The body part, the connecting part, the steel block and the multi-chamber hose are connected in sequence to further form a connected flushing channel, and the flushing channels are symmetrically arranged on both sides of the working channel.

7. The endoscopic catheter according to claim 6, wherein In the end face of the body part of the end cap away from the connecting part, the part provided with the camera module channel and the lighting channel is a plane, and the part provided with the working channel and the flushing channel is an arc surface.

8. The endoscopic catheter according to claim 6, wherein, The steel block and the multi-chamber hose are connected to further form a connected steel wire channel.

9. The endoscope catheter according to claim 5, characterized in that, A double concave lens is provided at one end of the lighting channel away from the steel block.

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