TWM675835U - Ultra-fine endoscopic device for minimally invasive joint surgery - Google Patents

Abstract

This invention provides an ultra-fine endoscopic device for minimally invasive joint surgery, comprising a main housing, an insertion tube, an endoscope body, and a working unit. The main housing is designed for gripping and has a space to accommodate imaging and therapeutic components. One end of the insertion tube is located inside the main housing, while the other end extends and is fixed at the front of the main housing. The camera tube of the endoscope body passes through the insertion tube into the joint cavity, with the rear end connected to the imaging display system at the rear of the main housing. The working unit's accommodation chamber is placed at the rear of the main housing and is connected to the rear end of the working tube. The front end of the working tube, along with the camera tube, is placed inside the insertion tube, and fluid is injected through the working tube to expand the joint cavity and improve image clarity. This device, with its ultra-fine insertion tube, enters the joint cavity to reduce incision size and postoperative recovery time, while enhancing imaging accuracy and surgical safety.

Description

Ultra-fine endoscopic device for minimally invasive joint surgery

This invention relates to a rigid joint endoscope, specifically an extremely fine endoscope device that can be used for minimally invasive joint surgery.

Existing joint endoscope devices are generally large in size, and the external diameter of their insertion tubes is usually at least 5mm. Even though some minimally invasive endoscopes can be reduced to 2.7mm, they will still cause a certain degree of pressure and extrusion on the tissues in the joint cavity, thereby increasing the patient's discomfort and prolonging the postoperative recovery time. In addition, the endoscopic devices in the existing technology are mainly used for image observation. When operations such as water injection, medication, or extraction of accumulated fluid are required during the operation, an additional syringe or another catheter is often required to complete the operation. This configuration requires an additional wound to be inserted into the patient's joint to accommodate the syringe or catheter, which not only increases the invasiveness and infection risk of the operation, but may also affect the healing speed of the wound and the postoperative recovery effect. For middle-aged and elderly patients, or those with chronic diseases such as diabetes and poor wound healing ability, additional wounds will further increase postoperative risks and even affect the surgical results.

Furthermore, because existing imaging and treatment devices are typically designed independently, doctors must simultaneously operate an endoscope, a syringe, or even micro-surgical instruments during surgery. This not only results in at least two incisions at the joint, but also significantly increases the complexity of the surgical procedure. Especially within the confined joint cavity, the simultaneous use of multiple instruments can easily cause operational interference, affecting the doctor's hand coordination and surgical precision. Furthermore, additional instruments entering the joint cavity may obscure the endoscope's field of view, reducing image clarity and, in turn, impacting observation and surgical efficiency. Therefore, how to provide an endoscopic device with a more sophisticated structure that can simultaneously perform image observation and treatment operations to reduce the number of incisions, lower surgical risks, and improve surgical precision has become a pressing problem in the current technical field.

To solve the above problems, the purpose of this invention is to provide an ultra-fine endoscopic device with a precise structure that can perform image observation and treatment operations simultaneously, suitable for minimally invasive joint surgery.

This invention relates to an ultra-fine endoscope device that can be used for minimally invasive joint surgery, comprising a main housing, an insertion tube, an endoscope body, and a working unit. The main housing is used for an operator to hold. The insertion tube is connected to the main housing, with a portion of the insertion tube disposed within the main housing and the other portion extending outward from the front end of the main housing. The diameter of the insertion tube ranges from 0.8 mm to 1.3 mm. The endoscope body includes a camera tube, which is disposed within the insertion tube and connected to an image display system. The camera tube is used to provide real-time images of the internal structure of the joint cavity. The working unit includes a receiving cavity and a working channel. The receiving cavity is located on the main housing. The working channel is connected to the receiving cavity and is located within the insertion tube along with the camera tube. The working channel has a diameter ranging from 0.3mm to 0.5mm. The working unit can inject water through the working channel to open up tissue within the joint cavity, increase the viewing range of the camera tube, and enhance image clarity.

As can be seen above, the integration of the ultra-fine insertion tube and the main endoscope body allows the ultra-fine endoscope to enter the joint cavity through a smaller incision, reducing compression and damage to surrounding tissues, alleviating patient discomfort and shortening postoperative recovery time. Furthermore, the integration of the ultra-fine insertion tube and the working channel allows the working unit to perform water injection operations through the working channel, appropriately expanding the tissue within the joint cavity, improving the viewing range and image clarity of the camera tube, and thus enhancing the physician's observation effect and diagnostic accuracy. Compared to previous technologies that require the use of additional syringes or catheters for auxiliary operations, this invention can simultaneously achieve image observation and basic treatment functions through a single device, helping to reduce the number of incisions, lower the invasiveness of surgery and the risk of infection, and improve the convenience and safety of surgery.

The diameter of the insertion tube is 1 mm, and the diameter of the working pipe is 0.3 mm.

The maximum diameter of the camera tube is 0.7 mm, and the endoscope body also includes a complementary metal oxide semiconductor sensor (CMOS sensor) located at the front end of the camera tube to capture images and transmit them to the image display system.

Wherein, the working unit can be used as a medicine infusion pipeline.

The working unit can be connected to a negative pressure device, and the negative pressure device can extract the accumulated fluid in the joint cavity through the working pipe.

The endoscope body further includes a micro light-emitting unit disposed at the rear end of the insertion tube to provide lighting.

Throughout this document, directional terms or similar terms, such as "front," "back," "left," "right," "upper," "lower," "inner," "outer," and "side," are primarily used with reference to the accompanying drawings. These directional terms and similar terms are intended solely to facilitate description and understanding of the various embodiments of this document and are not intended to limit this document. The use of the quantifiers "a" or "an" in reference to elements and components throughout this document is for convenience and to provide a general understanding of the scope of this document. They should be interpreted as including one or at least one, and the singular concept also includes the plural unless otherwise clearly indicated. Throughout this work, similar terms such as "combination," "assembly," or "assembly" primarily encompass connections that allow for separation without damaging the components, or connections that render the components inseparable. Those skilled in the art will determine the appropriate connection based on the materials of the components to be connected or the requirements of the assembly.

Throughout this work, references to "system," "device," and "unit" may each include at least one "processor." A processor refers to any data processing device implemented in hardware or hardware and software, with specific functionality, to process and analyze information and/or generate corresponding control information. Examples include electronic controllers, servers, cloud platforms, virtual machines, desktop computers, laptops, tablet computers, or smartphones, and are generally understood by those skilled in the art to which this work relates. Furthermore, the system may include corresponding data receiving or transmitting units to receive or transmit the required data. Furthermore, the system may include corresponding databases/storage units to store the required data. In particular, unless otherwise specifically excluded or contradictory, the processor may be a collection of multiple processors within a distributed system architecture, used to include/represent the processes, mechanisms, and results of information stream processing between the multiple processors. The mechanisms for transmitting and/or receiving signals between various components, such as "systems," "devices," and "units," described throughout this work are based on corresponding hardware and compatible software systems between these components to implement the configuration of the Internet of Things, and these technologies are generally understood by those skilled in the art.

To make the above and other purposes, features, and advantages of this invention more clearly understood, the following provides a preferred embodiment of this invention and provides a detailed description thereof in conjunction with the accompanying drawings. In addition, elements marked with the same symbols in different drawings are considered the same and their descriptions are omitted.

The purpose of this invention is to provide an ultra-fine endoscopic device 1 with a precise structure that can perform image observation and treatment operations simultaneously, suitable for minimally invasive joint surgery.

Referring to the first and second figures, the present invention provides an ultra-fine endoscope device 1 that can be used for minimally invasive joint surgery. In some embodiments, the ultra-fine endoscope device 1 includes a main housing 11, an insertion tube 12, an endoscope body 13, and a working unit 14.

The main housing 11 is designed for the operator to hold. It contains a storage space 111 for accommodating imaging and treatment-related components. The main housing 11 includes a front end 112 and a rear end 113, positioned opposite each other. The main housing 11 has an ergonomically designed profile. The portion near the front end 112 is tapered to facilitate precise manipulation, while the portion near the rear end 113 is thicker to provide a stable grip. The front end 112 is provided with a through-hole 114 for the insertion tube 12 to pass through. The main housing 11, surrounding the through-hole 114, securely holds the insertion tube 12 in place, ensuring the structural stability and operational precision of the ultra-fine endoscope device 1 during use. Furthermore, the main housing 11 can be constructed of medical-grade, corrosion-resistant material to ensure the durability and safety of the ultra-fine endoscope device 1 in surgical environments.

The insertion tube 12 is connected to the main housing 11. A portion of the insertion tube 12 is positioned within the main housing 11, while the remaining portion extends outward from the front end 112 of the main housing 11, facilitating deep insertion into the joint cavity for imaging and therapeutic procedures. The outer diameter of the insertion tube 12 ranges from 0.8mm to 1.3mm, enabling it to maintain good mechanical strength while minimizing compression and trauma to joint tissue. Furthermore, the insertion tube 12 can be constructed from high-strength, lightweight medical-grade materials to reduce excess weight and enhance operational flexibility. The main housing 11 of the present invention's ultra-fine endoscope device 1 may further include an insertion tube fixture 115, disposed within the main housing 11 and securely connected to the inner side of the main housing 11. The insertion tube fixture 115 is used to further secure the insertion tube 12, maintaining its precise position during surgery and preventing any movement or displacement. In addition to the support provided by the main housing 11 at the perforation 114, the insertion tube 12 is further securely positioned within the main housing 11 by the insertion tube fixture 115, ensuring clear image transmission and precise treatment procedures.

The endoscope body 13 includes a camera tube 131. The front end of the camera tube 131 is inserted into the insertion tube 12, and the rear end of the camera tube 131 is connected to an external image display system 15 through the rear end of the main housing 11. The camera tube 131 is used to provide real-time images of the internal structure of the joint cavity.

The working unit 14 includes a receiving cavity 143 and a working channel 142. One of the functions of the working unit 14 is to inject water through the working channel 142 to open the tissue in the joint cavity and increase the visual range of the camera tube 131 and improve image clarity. The receiving cavity 143 can be mounted on the main housing 11 via a connector 141. For example, the connector 141 can be mounted on the rear end 113 of the main housing 11 to facilitate the storage and delivery of liquids. Specifically, the receiving cavity 143 is used to hold liquids suitable for injection into the joint cavity, such as saline solution. Liquids can be precisely injected into the joint cavity through the working conduit 142 using external forces such as an electrically operated micropump or manual manipulation to help expand the joint space, clear debris from the surgical area, or improve visual clarity. The rear end of the working conduit 142 is connected to the receiving cavity 143, and the front end of the working conduit 142 is disposed within the insertion tube 12 together with the camera tube 131, allowing the liquid to be directly delivered to the target area. The diameter of the working pipe 142 ranges from 0.4 mm to 0.2 mm.

It is worth mentioning that the receiving cavity 143 can be provided with a commercially available syringe as its storage function. The syringe is detachably mounted on the connector 141 on the main housing 11, which facilitates operation and maintenance. During operation, the doctor can easily install the receiving cavity 143 to the corresponding position at the rear end of the main housing 11 and ensure its stable connection. The syringe replacement process is simple and quick. When the surgical procedure is completed or the fluid needs to be replaced, the doctor only needs to remove the old syringe and replace it with a new one. This design not only improves the convenience of operation, but also effectively improves the hygiene standards of the device, further reducing the risk of cross-infection.

As can be seen from the foregoing, the combination of the ultra-fine insertion tube 12 and the camera tube 131 enables the ultra-fine endoscope device 1 to enter the joint cavity with a smaller and fewer incisions, reducing compression and damage to surrounding tissues, alleviating patient discomfort and shortening postoperative recovery time. Furthermore, the combination of the ultra-fine insertion tube 12 and the working channel 142 allows the working unit 14 to perform water injection operations through the working channel 142, appropriately expanding the tissue within the joint cavity and improving the viewing range and image clarity of the camera tube 131, thereby enhancing the physician's observation efficiency and diagnostic accuracy. Compared to previous technologies that require the use of additional syringes or catheters for auxiliary operations, this invention can simultaneously achieve image observation and basic treatment functions through a single device, helping to reduce the number of incisions, lowering surgical invasiveness and infection risks, and improving surgical convenience and safety. It is worth noting that in addition to joint cavity application, this invention can also be applied to other medical fields, such as spinal surgery, internal organ examinations, and minimally invasive neurosurgery. These applications can be reasonably inferred by those with ordinary skill in the field based on the content disclosed in this invention, so they will not be elaborated here.

In some embodiments, the diameter of the insertion tube 12 can be better designed to have an external diameter of 1mm, so as to reduce the squeeze on the joint tissue while maintaining sufficient structural strength, thereby improving the postoperative recovery effect. The working channel 142 can be designed to have an external diameter of 0.3mm, so that it can be smoothly installed in the insertion tube 12, and there is enough space for the camera tube 131 to be installed in the insertion tube 12. The size of the working channel 142 is sufficient to perform functions such as liquid delivery, drug injection or fluid extraction. It is worth mentioning that the insertion tube 12 can also use the specifications of an 18-gauge needle, whose external diameter is approximately 1.27mm.

In some embodiments, the diameter of the camera tube 131 can be designed to be a maximum of 0.7 mm to reduce the overall size of the ultra-fine endoscope device 1 while ensuring sufficient image resolution, thereby minimizing the impact on tissues within the joint cavity. Furthermore, the endoscope body 13 also includes a complementary metal oxide semiconductor sensor 132 disposed at the front end of the camera tube 131 for real-time capture of images within the joint cavity. The image data is then transmitted to the image display system 15 via digital signal processing technology to provide clear, high-resolution, real-time images.

Referring to FIG. 3 , further explanation is provided for the endoscope body 13, which further includes an optical fiber fixture 133, a micro-light-emitting unit 134, and a transmission cable 135. The micro-light-emitting unit 134 is positioned behind the insertion tube 12 to guide light into the tube 12 for illumination, thereby enhancing image clarity through the light source provided by the tube 12. The optical fiber fixture 133 is positioned between the micro-light-emitting unit 134 and the rear end of the insertion tube 12 to ensure stable light transmission into the tube 12, enhancing the illumination effect. It's worth noting that the optical fiber fixture 133 and the insertion tube fixture 115 are similarly located within the main housing 11 and are connected and secured to the inside of the housing 11. Both effectively enhance the structural stability of the endoscope body 13. The transmission cable 135 is located at the rear end of the main housing 11 and connects to the image display system 15. It also covers the portion of the camera tube 131 exposed outside the main housing 11, providing additional protection and preventing external forces from affecting the operation of the camera tube 131.

In some embodiments, the working unit 14 can serve as a drug infusion conduit, allowing therapeutic drugs to be delivered directly to the joint lesion area to enhance local efficacy and reduce systemic side effects. During actual operation, the doctor can first observe the lesion area within the joint cavity through the endoscope body 13 and adjust the angle and depth of the insertion tube 12 based on the image display results, so that the front end of the working conduit 142 is aligned with the target lesion area. Subsequently, an appropriate amount of therapeutic drug is delivered to the area through the working unit 14 to exert a therapeutic effect. Joint lesions that may require drug delivery include, but are not limited to, rheumatoid arthritis, degenerative arthritis (osteoarthritis), and gouty arthritis. Commonly used medications for these diseases include hyaluronic acid preparations, nonsteroidal anti-inflammatory drugs (NSAIDs), steroids (corticosteroids), and disease-modifying antirheumatic drugs (DMARDs).

It's worth noting that the working unit 14 can also serve as a conduit for injecting contrast agents, enhancing the visibility of the affected area. For example, a blue dye (such as methylene blue, MB) or an iodine-containing contrast agent (such as Iohexol) can be injected into the joint cavity to help identify lesions such as cartilage damage and ligament tears. Next, the light-emitting unit 33 uses a special light source (such as a high-spectrum light source) and is installed within the insertion tube 12 via an optical fiber. The light source is introduced and irradiated onto the affected area. The optocoupler element 132 can capture images in conjunction with the wavelength of the special light source, allowing doctors to more accurately observe the location of the lesion, thereby improving the accuracy of diagnosis and surgery. Specific wavelength light sources can further optimize imaging effects. For example, blue light (400nm to 500nm) can be combined with methylene blue or indigo carmine to enhance tissue contrast and help observe articular cartilage wear and ligament damage. Near-infrared light (NIR, 700nm to 900nm) can be combined with indocyanine green (ICG) for microvascular imaging to assess subchondral bone changes and synovial inflammation.

In some embodiments, the working unit 14 can be connected to a negative pressure device, and the negative pressure device can be used to extract the accumulated fluid in the joint cavity through the working pipe 142 to reduce joint swelling. During actual operation, the suction intensity and flow rate can be controlled according to the patient's condition by an electric negative pressure device or manual negative pressure suction, so that the accumulated fluid can be stably removed from the joint cavity to avoid excessive burden on the joint tissue. It is worth mentioning that the extraction of joint effusion plays an important role in the diagnosis and treatment of various joint diseases. For example, for diseases such as traumatic joint effusion, extracting joint effusion can effectively reduce swelling and pain, and improve the patient's joint mobility. Furthermore, the extracted joint fluid can be further subjected to biochemical testing or bacterial culture to assist in diagnosing the cause of the disease, such as detecting uric acid crystals to diagnose gout, or confirming the presence of bacterial infection through culture to further guide antibiotic treatment. It should be noted that the negative pressure device can be the receiving chamber 143. For example, a syringe can serve as both the negative pressure device and the receiving chamber 143. Alternatively, two syringes can be provided, one serving as the receiving chamber 143 and the other as the negative pressure device.

Another purpose of this invention is to provide an auxiliary guidance and precise positioning method for an ultra-fine endoscopic device 1 with a precise structure that can simultaneously perform image observation and treatment operations, allowing doctors to effectively control the entry position and viewing angle of the endoscopic device during minimally invasive surgery, thereby improving the accuracy and safety of diagnosis.

Referring to FIG. 4 , in some embodiments, this invention provides a guidance and precise positioning method for assisting minimally invasive joint surgery, which is applied to the ultra-fine endoscopic device 1 described above for use in minimally invasive joint surgery. Through this method, a physician can accurately position the endoscopic device to the target area with minimal impact on surrounding tissues, allowing for real-time image observation and necessary diagnostic procedures. The method comprises the following steps:

Step A: Insert the insertion tube 12 of the ultra-fine endoscope device 1 into the joint cavity and adjust it appropriately based on the anatomical structures within the joint cavity to obtain the optimal viewing angle. For example, by rotating or moving the main housing 11 back and forth, the viewing angle of the camera tube 131 can be aligned with the lesion site while preventing the image from being blurred by the tissue or fluid concentration within the joint cavity.

Step B: Following Step A, the endoscope body 13 is activated, causing the camera tube 131 to capture real-time images of the internal structures of the joint cavity. These images are then displayed in high resolution via the image display system 15, allowing the operator to clearly identify the condition of joint tissues such as cartilage, ligaments, and synovium. It is worth noting that capturing images from different angles allows physicians to more comprehensively assess the extent of the lesion and the degree of tissue damage.

Step C: Continuing from Step A or Step B, the working unit 14 performs water injection to expand the tissue within the joint cavity, thereby increasing the viewing range of the endoscope body 13 and improving image clarity. Furthermore, the water injection operation can be performed using an electric micropump or manually, slowly injecting physiological saline or balanced fluid into the joint cavity to remove impurities and blood, reduce blurred vision, and avoid the discomfort of excessive pressure in the joint cavity caused by excessive water injection.

In some embodiments, the guidance and precise positioning method further includes step D: Continuing from step B or step C, adjusting the angle and depth of the ultra-fine endoscope device 1 using the real-time image provided by the endoscope body 13 to ensure optimal observation and treatment accuracy. Furthermore, based on the internal structure of the joint cavity as displayed by the image display system 15, the physician can fine-tune the angle of the insertion tube 12 as needed to avoid image blind spots or tissue obstruction that could hinder diagnosis and treatment. Furthermore, the ultra-fine endoscope device 1 can be advanced or retracted based on the depth of the lesion to ensure precise observation of the lesion.

It is worth mentioning that when performing surgical operations such as tissue examination, drug injection or fluid extraction, the ultra-fine endoscope device 1 can be fine-tuned simultaneously to maintain a stable field of view and reduce interference with surrounding healthy tissues, thereby improving the safety of minimally invasive joint surgery.

In some embodiments, the guidance and precise positioning method further includes a step E: following step B, step C, or step D, the working unit 14 is connected to the negative pressure device, the fluid in the joint cavity is extracted through the working channel 142, and image changes are monitored in real time to evaluate the extraction effect and changes in the environment in the joint cavity. To further illustrate, the doctor can observe the distribution of the accumulated fluid based on the real-time image provided by the endoscope main body 13, and adjust the position of the working channel 142 in a timely manner to ensure that the accumulated fluid can be effectively discharged. In addition, during the extraction process, the doctor can simultaneously observe changes in the tissues in the joint cavity, such as the degree of congestion of the synovial membrane, the disappearance of the inflammatory response, or whether there is still residual fluid. It is worth mentioning that through real-time imaging monitoring, doctors can reduce the impact of excessive extraction on joint cavity pressure, ensure the safety of the surgical process, and improve the diagnostic accuracy of the diseased area.

In some embodiments, the guidance and precise positioning method further includes step F: Continuing with step B, step C, step D, or step E, a therapeutic drug is delivered to the lesion area within the joint cavity via the working channel 142 of the working unit 14, and the drug distribution is monitored using the image display system 15 to ensure that the drug effectively acts on the target area. Furthermore, based on the real-time images provided by the endoscope main body 13, the physician can confirm the extent and severity of the lesion area and select the appropriate therapeutic drug for delivery. With the aid of the image display system 15, the physician can instantly monitor the diffusion of the drug within the joint cavity, ensuring even distribution of the drug to the affected area and adjusting the position of the working channel 142 or the injection rate as appropriate. Image monitoring can also be used to assess joint reactions after drug delivery. The fourth figure illustrates only one process flow. Based on the disclosure of this invention, a person of ordinary skill in the art can reasonably infer that the steps of this invention can be adjusted in order or repeated as needed, all of which fall within the scope of the patent application for this invention.

The effects of this creation can be summarized as follows:

1. Reduce surgical invasiveness and shorten recovery time: The ultra-fine endoscopic device 1 of this invention, through the insertion tube 12 with an outer diameter of 0.8mm to 1.3mm, can enter the joint cavity with a very small incision, reducing the squeeze and damage to the surrounding tissue, thereby reducing patient discomfort, shortening postoperative recovery time, and reducing the risk of infection.

2. Improved Image Observation Accuracy: The high-resolution camera tube 131 within the endoscope body 13, combined with the micro-light-emitting unit 134 and the optical fiber fixture 133, provides stable illumination, enabling real-time visualization of the joint cavity. Furthermore, the working unit 14 can perform water injection to appropriately expand the tissue within the joint cavity, improving visual clarity and aiding physicians in accurately diagnosing the location of lesions.

3. Integrated therapeutic functions: The working unit 14 of this invention can perform liquid delivery through the working channel 142, such as water injection to increase visual field, local drug injection or fluid extraction, without the need for additional syringes or catheters, reducing the number of additional wounds and making the operation simpler.

Although this invention has been disclosed using the preferred embodiments described above, they are not intended to limit this invention. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of this invention are still within the scope of technology protected by this invention. Therefore, the scope of protection of this invention includes all changes within the meaning and equivalent scope of the patent applications attached hereto. Furthermore, if multiple embodiments described above can be combined, this invention includes any combination of implementations.

1: Ultra-fine endoscope device 11: Main housing 111: Storage space 112: Front end 113: Back end 114: Perforation 115: Insertion tube fixture 12: Insertion tube 13: Endoscope body 131: Camera tube 132: Complementary metal oxide semiconductor sensor 133: Fiber optic fixture 134: Micro-light emitting unit 135: Transmission cable 14: Working unit 141: Connector 142: Working channel 143: Storage chamber 15: Image display system

The first figure is a three-dimensional schematic diagram of the ultra-fine endoscope device of this invention that can be used for minimally invasive joint surgery; the second figure is a three-dimensional exploded schematic diagram of the ultra-fine endoscope device of this invention that can be used for minimally invasive joint surgery; the third figure is a block schematic diagram of the ultra-fine endoscope device of this invention that can be used for minimally invasive joint surgery; and the fourth figure is a schematic diagram of the process of this invention.

1: Ultra-fine endoscope device

11: Main body

111: Accommodation Space

112: Front-end

113: Backend

114: Perforation

115: Insertion tube fixing piece

12: Insertion tube

13: Endoscope body

131: Camera tube

133: Fiber optic fixings

134: Micro light-emitting unit

135: Transmission Cable

14: Work Unit

141: Connector

142: Work Pipeline

143: Storage chamber

Claims (6)

An ultra-fine endoscope device for use in minimally invasive joint surgery comprises: a main housing for an operator to hold; an insertion tube connected to the main housing, a portion of the insertion tube disposed within the main housing and another portion extending outward from the front end of the main housing, the insertion tube having a diameter ranging from 0.8 mm to 1.3 mm; an endoscope body including a camera tube disposed within the insertion tube and connected to an image display system, the camera tube being used to provide real-time images of the internal structure of the joint cavity; and A working unit includes a receiving cavity and a working channel. The receiving cavity is disposed on the main housing. The working channel is connected to the receiving cavity. The working channel and the camera tube are disposed within the insertion tube. The diameter of the working channel ranges from 0.3mm to 0.5mm. The working unit can inject water through the working channel to prop open tissue within the joint cavity, increase the viewing range of the camera tube, and improve image clarity. An ultra-fine endoscope device that can be used for minimally invasive joint surgery as described in claim 1, wherein the diameter of the insertion tube is 1 mm and the diameter of the working channel is 0.3 mm. An ultra-fine endoscope device for use in minimally invasive joint surgery as described in claim 1, wherein the diameter of the camera tube is a maximum of 0.7 mm, and the endoscope body further includes a complementary metal oxide semiconductor sensor (CMOS sensor) disposed at the front end of the camera tube for image capture and transmission to the image display system. The ultra-fine endoscopic device that can be used for minimally invasive joint surgery as described in claim 1, wherein the working unit can be used as a drug infusion channel. As described in claim 1, the ultra-fine endoscopic device can be used for minimally invasive joint surgery, wherein the working unit can be connected to a negative pressure device, and the negative pressure device can extract the accumulated fluid in the joint cavity through the working channel. As described in claim 1, the ultra-fine endoscope device that can be used for minimally invasive joint surgery, wherein the endoscope body also includes a micro light-emitting unit arranged at the rear end of the insertion tube to provide lighting.