Endoscope outer sleeve combined suite with adjustable inner diameter

Abstract

The invention relates to an endoscope outer sleeve combined suite with an adjustable inner diameter for minimally invasive spine surgery, and belongs to the technical field of medical instruments. When a traditional small-diameter endoscope is matched with a small-diameter outer sleeve, the small-diameter outer sleeve is small in peripheral soft tissue pushing range, small in visual field range in the small-diameter outer sleeve and small in effective operation visual field, and if the traditional small-diameter endoscope is matched with a large-diameter outer sleeve, the operation visual field range can be effectively expanded. In order to solve the problem that clinical pain points which are poor in adaptability, insufficient in stability and difficult to consider the sealing performance when a small-diameter endoscope is matched with a large-diameter outer sleeve for use, the invention provides an innovative design of an endoscope and outer sleeve combined kit with the adjustable inner diameter, and adaptation is achieved by placing an inner sleeve of an inner diameter adjusting structure; according to the large-diameter endoscope, the adaptability of the small-diameter endoscope matched with the large-diameter outer sleeve is effectively achieved, a large surgical field can be obtained through the small-diameter endoscope, the surgical efficiency is improved, the surgical time is shortened, and the large-diameter endoscope has the remarkable clinical application value and the economical advantage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices and minimally invasive spine surgery, and in particular to an inner diameter adjustable endoscope working cannula combined kit for minimally invasive endoscopic spine surgery. More specifically, the present application relates to an inner diameter adjustable endoscope working cannula combined kit that solves the problems of stability, wide surgical field of view and irrigation fluid sealing when matching small diameter endoscopes with large diameter working cannulas through innovative composite lumen configuration and diversified adaptive structure. BACKGROUND

[0002] In minimally invasive spine surgery (such as transforaminal endoscopic discectomy and percutaneous endoscopic lumbar discectomy), the working cannula is a key instrument for establishing an operating channel from the body surface to the target point. The surgeon inserts the endoscope and surgical instruments into this channel for visualized operation. Currently, the working cannula widely used in clinical practice has a fixed inner diameter. This single diameter design leads to a long-term, unresolved clinical dilemma: if a small inner diameter cannula is used, it can better match small diameter endoscopes, provide sufficient radial support to ensure stability, and reduce irrigation fluid leakage, but it will limit the surgical field of view and instrument operating space, affecting surgical efficiency and safety. If a large inner diameter cannula is used, it can provide a wide field of view and flexible operating space, but when matched with a small diameter endoscope, the endoscope will move severely within the cannula, resulting in poor stability and severely affecting the operation precision. More importantly, the large annular gap between the endoscope and the inner wall of the cannula will cause a large amount of irrigation fluid (normal saline) to be lost, which not only wastes fluid but also leads to insufficient water pressure in the surgical field and reduced clarity. There are different diameter endoscope systems on the market, usually small diameter endoscopes matched with small diameter working cannulas, and large diameter endoscopes matched with large diameter working cannulas, each set of endoscope system is expensive. Since the effective magnification of most spine endoscopes is sufficient, usually 5-20 times, if a small diameter endoscope can be compatible with a large diameter working cannula adapted for a large diameter endoscope, a larger surgical field of view can be obtained, and surgical efficiency can be improved, which can significantly reduce the dependence on large diameter endoscopes in clinical practice. Using a traditional small diameter endoscope matched with a small diameter working cannula has the problems of small range of soft tissue displacement around the small diameter working cannula, small field of view in the small diameter working cannula, and small effective surgical field of view. If a large diameter working cannula is matched, it can displace a larger range of soft tissue around, and the large diameter working cannula has a larger inner diameter, which can effectively expand the surgical field of view. Currently, if a small diameter endoscope is used with a large diameter working cannula, it will have the clinical pain points of poor adaptability, insufficient stability, and difficult to balance sealing. Therefore, there is an urgent need in the art for an innovative cannula solution that can dynamically adjust the working inner diameter to simultaneously balance the three mutually contradictory requirements of instrument stability, wide surgical field of view, and fluid sealing. SUMMARY

[0003] Technical problems solved: The present application aims to overcome the fundamental defects of the prior art and provides an endoscope overtube assembly with adjustable inner diameter. The primary purpose is to flexibly and reliably adapt to a relatively large diameter overtube without replacing a small diameter endoscope, ensuring the absolute stability and appropriate sealing of the endoscope at the distal end of the overtube, and completely retaining the wide operating space and field of view at the proximal end of the overtube. Technical solutions: To achieve the above-mentioned purpose, the present application provides an endoscope overtube assembly with adjustable inner diameter, which is characterized by the innovative "proximal end operation channel-distal end working channel" composite lumen configuration, and the configuration is realized by one of the following three technical solutions: 1. Solution one (detachable type): The inner diameter reduced working channel is formed by inserting an inner sleeve (2) independent of the overtube (1) into the lumen thereof; the working channel is fixed or not fixed at the distal end of the overtube (1) by an inner sleeve (2) with an enlarged tail cap; or the inner sleeve (2) is detachably connected with the overtube (1) through a connecting and fixing mechanism; the connecting and fixing mechanism includes: a) mechanical connecting mechanism: the distal end of the overtube (1) is provided with a first connecting part (12), and the proximal end of the inner sleeve is provided with a second connecting part (21) matched with the first connecting part (12); reliable connection is realized through mechanical cooperation (such as buckle, thread) of the two; b) interference fit mechanism: the inner sleeve is made of elastic material, and its outer diameter is equal to the inner diameter of the lumen at the distal end of the overtube (1) plus a little, and the interference fit force is realized by the elastic deformation of the inner sleeve and the inner wall of the overtube to realize fastening and sealing. 2. Solution two (fixed type): The inner diameter reduced working channel is formed by permanently fixing an independent inner sleeve at the distal end of the lumen of the overtube (1). 3. Solution three (integral type): The inner diameter reduced working channel is formed by the structure of the lumen of the overtube (1) itself; that is, the lumen includes a proximal end large inner diameter section (3) and a distal end small inner diameter section (4). BRIEF DESCRIPTION OF DRAWINGS

[0004] Fig. 1 The structure diagram of the overtube in the detachable embodiment (mechanical connection) of the present application. Fig. 2 The structure diagram of the inner sleeve in the detachable embodiment (mechanical connection) of the present application. Fig. 3 The overall assembly structure diagram of the detachable embodiment (mechanical connection) of the present application. The figure number is explained: 1: overtube; 12: first connecting part (handle); 121: through hole (located on the first handle); 2: inner sleeve; 21: second connecting part (handle); 211: protrusion (located on the second handle). DETAILED DESCRIPTION

[0005] The application will be described in detail below with reference to the accompanying drawings and examples. Example: detachable (mechanical connection) as Figs. 1 to 3 As shown in the figure, the embodiment provides an endoscope cannula assembly kit with replaceable adapters. The cannula (1) is made of medical-grade stainless steel, which is a hollow tubular member. Its wall thickness is 1 mm, the inner diameter is 18 mm (circular), and the length is 150 mm. Its proximal port is processed into a round port shape that matches the outer wall of the upper and lower lamina, and the edge is a smooth arc surface to reduce tissue damage. A first handle (12) extending transversely outward is provided on the outer wall of the distal end of the cannula (1) as a first connecting part, and a through hole (121) is provided on the handle. The inner cannula is a rigid inner cannula (2) made of medical-grade PEEK plastic (polyether ether ketone). Its length is 40 mm, it is a single-hole coaxial structure, the inner diameter is 6.5 mm (for adapting to the inner diameter of 6.3 mm of the endoscope), and the outer diameter is 17.0 mm. A second handle (21) extending transversely outward is provided on the outer wall of the proximal end of the inner cannula (2) as a second connecting part, and a protrusion (211) is provided at the bottom of the handle which can be engaged with the through hole (121) on the handle of the outer cannula. Method of use: when a small-diameter endoscope is needed during surgery, first insert the inner cannula (2) along the lumen of the outer cannula (1) until the second handle (21) contacts the first handle (12). Then align and press the protrusion (211) to make it engage in the through hole (121), realizing the detachable fixed connection of the inner cannula (2) and the outer cannula (1), at this time the distal end of the outer cannula forms a stable working channel with an inner diameter of 6.5 mm. Then put the endoscope and / or instrument into the channel for operation. After the operation is completed, if the inner cannula (2) needs to be removed, only need to apply a reverse force to pry the second handle (21) to make the protrusion (211) disengage from the through hole (121), then the inner cannula (2) can be removed, and the outer cannula (1) returns to its original state. The system can be configured with multiple inner cannulas (2) with different inner diameters, so as to flexibly adapt to endoscopes and / or operating instruments of different outer diameters.

[0006] The invention point of the application is a multi-level, systematic innovation collection, mainly embodied in the following four aspects: 1. Concept innovation: It first creates the concept of "proximal operation channel-distal working channel" composite lumen configuration, which solves the long-term technical problem in this field from the top-level design. 2. Scheme innovation: It provides three levels of technical implementation paths of detachable, fixed, and integrated, which provides the optimal solution for different application scenarios. 3. Structure innovation: For the detachable scheme, it creatively designs multiple connection and sealing mechanisms with high reliability (mechanical connection) and high cost performance (interference fit). 4. Mode innovation: It introduces the modular design mode of "platform + module", realizing "one mirror multiple use" and significantly reducing medical costs.

[0007] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided above with reference to the drawings is not intended to limit the protection scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art without creative effort based on the embodiments of the present application belong to the protection scope of the present application.

Claims

1. An adjustable inner diameter endoscope overtube assembly kit, comprising: The application relates to an endoscope sleeve. The application relates to an endoscope sleeve.

2. The endoscope cannulatmg kit of claim 1, wherein, The application relates to an endoscope sleeve.

3. The endoscope cannula assembly kit of claim 2, wherein, The application relates to an endoscope sleeve.

4. The endoscope cannula assembly kit of claim 2, wherein, The application relates to an endoscope sleeve.

5. The endoscope cannulatmg kit of claim 2, wherein, The application relates to an endoscope sleeve.

6. The endoscope cannula assembly kit of claim 1, 2, wherein, The application relates to an endoscope sleeve.

7. The set of endoscope cannula according to claim 1, 2, characterized in that, The application relates to an endoscope sleeve.

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The endoscope cannulatmg kit of claim 2, 3, 6, or 8, wherein, The system is configured with a plurality of inner sleeves (2) with different inner diameters to adapt to endoscopes and / or operating instruments with different outer diameters; the outer sleeve (1) is made of medical-grade stainless steel, titanium alloy, high-strength plastic or ceramic material; the inner sleeve (2) is made of medical-grade stainless steel, titanium alloy, PEEK, PEI, medical silica gel, rubber or high polymer composite material.

10. A minimally invasive spinal procedure tool, comprising: Use of an endoscope outer sleeve combined kit as claimed in any one of claims 1-9.

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