Spine endoscope trephine device and system with adjustable inner diameter

Abstract

The invention discloses a spine endoscope trephine device and system with the adjustable inner diameter, and belongs to the technical field of spine minimally invasive surgery instruments. The system comprises an outer trephine main body, the distal end area of a lumen of the outer trephine main body is configured to form a working channel with a reduced inner diameter, and the working channel is used for stably accommodating a spinal endoscope; the near-end area is configured to form an operation channel with the inner diameter larger than that of the working channel, and the operation channel is used for providing an instrument operation space. And the working channel is realized through a lining pipe which is detachably connected and permanently fixed in the main body or is integrally formed with the main body. The small-diameter endoscope can be stably matched with a large-diameter trephine for use, the problems that in the prior art, the cutting range is limited, and flushing fluid is lost are effectively solved, and the flexibility, stability and efficiency of an operation are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a bone tissue removal tool for minimally invasive endoscopic spinal surgery. Background Technology

[0002] In minimally invasive spinal surgery, the trephine is a crucial tool for resecting bony structures. Small-diameter trephines offer a limited surgical field of view and lower bone-cutting efficiency. Large-diameter trephines provide a wider surgical field of view and greater bone-cutting efficiency. Currently, widely used trephine systems have an inner diameter matched to a fixed-diameter endoscope: small-diameter endoscopes (outer diameter typically 3.5-6.3 mm) are matched with small-diameter trephines, and large-diameter endoscopes are matched with large-diameter trephines (inner diameter typically 6-12 mm). Each endoscope system with different diameters is quite expensive. Currently, small-diameter endoscopes cannot be matched with large-diameter trephines. This fixed design has led to a long-standing, unresolved clinical dilemma: while small-diameter endoscopes can be well matched with small-diameter trephines, providing a limited surgical field of view and lower bone-cutting efficiency... For surgeries requiring a larger operating field and greater bone-cutting efficiency, a small-diameter endoscope compatible with a large-diameter trephine saw would significantly improve the exposure and bone-cutting efficiency under the small-diameter endoscope, effectively reducing reliance on large-diameter endoscopes and conserving medical resources. However, when a large-diameter trephine saw is used with a small-diameter endoscope, the endoscope experiences significant wobbling within the lumen, resulting in extremely poor stability and severely impacting operational precision. More importantly, the large annular gap between the endoscope and the cannula wall causes substantial loss of irrigation fluid (saline), wasting fluid and leading to insufficient water pressure and reduced clarity in the surgical field. Therefore, a novel trephine saw system that balances the cutting range of a large trephine saw with the stability of a small endoscope is urgently needed. Summary of the Invention

[0003] The technical problem addressed by this invention is to solve the problems of poor stability, insufficient operational precision, limited cutting range, and irrigation fluid loss that occur when using a large-diameter circumferential saw with a small-diameter spinal endoscope in minimally invasive spinal surgery. To achieve the above objective, this invention adopts the following technical solution: a spinal endoscope circumferential saw system, comprising an outer circumferential saw body, which is a hollow tubular component with cutting teeth at its distal end; the lumen of the outer circumferential saw body is configured such that: its distal region forms a working channel with a reduced inner diameter for stably accommodating the spinal endoscope, and its proximal region forms an operating channel with an inner diameter larger than that of the working channel for providing operating space. The reduced-diameter working channel is achieved through one of the following three methods: 1. Detachable type: Formed by inserting an inner liner tube (2), i.e., an independent inner diameter fitting structure, into the cavity of the outer ring saw body. The outer ring saw body has a first connecting part at its distal end, and the inner liner tube (2) has a second connecting part at its proximal end that mates with the first connecting part. The two parts work together to achieve a detachable and fixed connection; or the inner liner tube (2) can be fixed or not fixed to the distal end of the outer ring saw body (1) by an enlarged tail cap. 2. Fixed type: Formed by permanently fixing an independent inner liner tube (2) to the distal end of the cavity of the outer ring saw body. 3. Integrated type: Formed integrally by the wall structure of the outer ring saw body itself. That is, the cavity includes a large inner diameter section at the proximal end and a small inner diameter section at the distal end. Attached Figure Description

[0004] Figure 1 This is a schematic diagram of the structure of the outer ring saw body in the replaceable embodiment of the present invention. Figure 2 This is a schematic diagram of the inner liner tube in a replaceable embodiment of the present invention. Figure 3 This is a schematic diagram of the outer ring saw body and inner liner tube assembled in the replaceable embodiment of the present invention. Figure 3 In the middle: 1. Outer ring saw body; 11. Cutting teeth; 12. First connecting part; 121. Through hole; 2. Inner liner tube; 21. Second connecting part; 211. Protrusion; 3. Proximal large inner diameter section; 4. Distal small inner diameter section. Detailed Implementation

[0005] The present invention will now be further described with reference to the accompanying drawings. Example (replaceable): such as Figures 1 to 3 As shown, this embodiment provides a spinal endoscope ring saw system with a replaceable inner liner. The outer ring saw body (1) is made of medical-grade stainless steel with a wall thickness of 0.5 mm, an inner diameter of 9 mm, an outer diameter of 10 mm, and a length of 95 mm. Its proximal end is a serrated cutting end (11). A first handle (12) extending vertically outward is provided at the distal end of the outer wall, and a through hole (121) serving as a connecting part is provided on the handle. The inner liner (2) is 30 mm long, made of medical-grade PEEK material, with an inner diameter of 6.5 mm (for fitting endoscopes with an outer diameter of 6.3 mm) and an outer diameter of 8.8 mm. A second handle (21) extending vertically outward is provided at the distal end of the outer wall, and a protrusion (211) serving as a connecting part is provided on the handle. The size of the protrusion (211) matches the through hole (121) on the handle of the outer ring saw body, enabling locking and fixation. During the surgery, when a small-diameter endoscope is required, first insert a suitable inner liner tube (2) into the outer ring saw body (1), align the protrusion (211) and lock it into the through hole (121) for fixation, and then insert the endoscope into the inner liner tube (2) for operation. After the operation, apply a reverse force to disengage the protrusion (211) from the through hole (121), and the inner liner tube (2) can be removed.

[0006] Compared with the prior art, the present invention has the following advantages: 1. Flexible or specific adaptation: Through various implementation methods, the working inner diameter of the trephine is flexibly adjustable or specifically adapted, with a wide range of applications and compatibility covering many mainstream spinal endoscope models. 2. Expanded cutting range: Enables small-diameter endoscopes to be cut using large-diameter trephine saws, significantly increasing the bone tissue cutting range, reducing clinical reliance on large-diameter endoscopes, and reducing investment in medical equipment. 3. High stability: The precise fit between the working channel and the endoscope greatly reduces endoscope wobbling and improves surgical precision. 4. Convenient operation or reliable structure: Replaceable solutions offer quick connection; integrated solutions have no connecting parts, avoiding the risk of failure, and offer high structural strength and easy sterilization. 5. Low manufacturing cost: The solution is based on mature technology, resulting in low manufacturing costs and easy promotion.

[0007] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described above with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided above with reference to the accompanying drawings is not intended to limit the scope of protection of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A spinal endoscope circumferential saw device and system with adjustable inner diameter, characterized in that, include: An outer ring saw body (1) is a hollow tubular component with a flat end and a cutting tooth (11) at its proximal end. The lumen of the outer ring saw body (1) is configured such that its distal region forms a working channel with a reduced inner diameter for stably accommodating a spinal endoscope, and its proximal region forms an operating channel with an inner diameter larger than that of the working channel for providing operating space.

2. The spinal endoscope circumferential saw device and system with adjustable inner diameter according to claim 1, characterized in that, The reduced inner diameter working channel is formed by an inner liner tube (2) separate from the outer ring saw body (1) and located within its cavity.

3. The spinal endoscope circumferential saw device and system with adjustable inner diameter according to claim 2, characterized in that, The inner liner tube (2) is an inner diameter-adaptive structure that can be inserted into the cavity of the outer ring saw body (1); the outer ring saw body (1) is provided with a first connecting part (12) at its far end, and the inner liner tube (2) is provided with a second connecting part (21) that cooperates with the first connecting part (12) at its far end; when the inner liner tube (2) is inserted, the inner liner tube (2) and the outer ring saw body (1) are detachably fixedly connected through the cooperation of the first connecting part (12) and the second connecting part (21); or the inner liner tube (2) is an interference fit mechanism, the inner liner tube is made of elastic material, and its external dimensions are configured such that when it is inserted into the far end of the cavity of the outer ring saw body (1), it can generate an interference fit force with the inner wall of the outer ring saw body (1) through its own elastic deformation, thereby achieving fastening and sealing; or the inner liner tube (2) is fixed or not fixed to the far end of the outer ring saw body (1) by the enlarged tail cap.

4. The spinal endoscope circumferential saw device and system with adjustable inner diameter according to claims 1 and 2, characterized in that, The inner diameter reduction working channel is a structure permanently fixed to the far end of the cavity of the outer ring saw body (1) or the inner diameter reduction working channel is integrally formed by the wall structure of the outer ring saw body (1); the cavity includes a proximal large inner diameter section (3) and a distal small inner diameter section (4), the proximal large inner diameter section (3) constitutes the operating channel, and the distal small inner diameter section (4) constitutes the working channel.

5. The endoscope sheath assembly kit according to claim 1, characterized in that, The inner liner is an elastic inner liner (2), and its cross-section is circular, elliptical, conical, or a shape that matches the lumen of the outer sleeve (1); the outer diameter of the elastic inner liner (2) is equal to or greater than the inner diameter of the distal end of the lumen of the outer sleeve (1) by 0.1-5 mm.

6. The spinal endoscope circumferential saw device and system with adjustable inner diameter according to claim 3, characterized in that, The first connecting part (12) is a first handle that extends vertically outward from the far end of the outer wall of the outer ring saw body (1), and the second connecting part (21) is a second handle that extends vertically radially outward from the near end of the outer wall of the inner liner tube (2); the first handle and / or the second handle are provided with a mating structure for mutual locking and fixing; the mating structure is one of the following or a combination thereof: a protrusion and a recess, a protrusion and a through hole, a buckle and a slot, a threaded fit, or a magnetic fit.

7. The spinal endoscope circumferential saw device and system with adjustable inner diameter according to claim 1, characterized in that, The outer ring saw body (1) has a wall thickness of 0.2-6mm, a circular cross-section with an inner diameter of 6-30mm and a length of 40-250mm; the cutting teeth (11) are configured as one of flat, oblique, or stepped, and the tooth structure is distributed in the range of 90°-360° at the port; the working channel has a length of 10-150mm; its inner diameter is 0.1-2mm larger than the outer diameter of the target spinal endoscope.

8. A spinal endoscope circumferential saw device and system with adjustable inner diameter according to claims 1 and 2, characterized in that, The outer ring saw body (1) is made of medical grade stainless steel, titanium alloy, high-strength plastic or ceramic material; the inner liner tube (2) is made of medical grade stainless steel, titanium alloy, PEEK, PEI, medical silicone, rubber or polymer composite material.

9. A spinal endoscope circumferential saw device and system with adjustable inner diameter according to claims 1, 2, and 4, characterized in that, The proximal end of the outer ring saw body (1) has sharp cutting teeth (11); the system is equipped with multiple inner liner tubes (2) with different inner diameters to accommodate spinal endoscopes with different outer diameters.

10. A minimally invasive spinal technique tool, characterized in that, Use the endoscope external ring saw and inner liner tube (2) combination kit as described in any one of claims 1-9.

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