Protective type directional cutting small needle knife adopting nano DLC (Diamond Like Carbon) coating

Abstract

The protective type directional cutting small needle knife adopting the nano DLC coating comprises a small needle knife body and a protective shell, a movable plate, an inner spline sleeve and a spline shaft are arranged in the protective shell, and the small needle knife body is coaxially and fixedly connected with the spline shaft; an adjusting mechanism is arranged on the protective shell, a movable plate is driven through spiral transmission to drive the small needle knife body to move telescopically, and position locking is achieved in cooperation with a locking block; an auxiliary mechanism is arranged on the internal thread sleeve and drives the spline shaft to do axial reciprocating motion, and the automatic needling function is achieved; a sealing mechanism is arranged at the front end of the protective shell, air is conveyed to the air bag through the piston rod and the cylindrical shell, and the air bag is controlled to expand and shrink to seal the through hole of the conical shell. Disease transmission caused by the fact that the small needle knife body scratches medical staff after use is effectively avoided, and operation safety and operation convenience are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a protective directional cutting needle knife with a nano-DLC coating. Background Technology

[0002] The shape of a small needle knife is similar to that of an acupuncture needle, but slightly thicker. It is used to treat closed soft tissue injuries such as muscles and tendons, to loosen and separate the affected areas, thus releasing and repairing lesions with symptoms such as spasm, edema, or adhesions. It is a medical device for treating acute and chronic closed soft tissue injuries and is a product of the combination of acupuncture needles and modern surgical scalpels. Traditional small needle knives are usually made of 316L stainless steel in one piece, and their blade hardness is relatively low (about 200 HV). When cutting dense connective tissue, the blade is prone to rolling and dulling, which leads to increased cutting resistance and aggravated tissue damage during the operation. In addition, biological contaminants such as protein can easily remain on the surface of the needle knife after the operation, posing a risk of cross-infection. In recent years, diamond-like carbon (DLC) coating technology has begun to be applied to the field of surgical instruments due to its high hardness (HV2000-3000), low coefficient of friction (0.05-0.1), and excellent chemical inertness.

[0003] A Chinese patent with publication number CN120053015A includes: a small needle knife assembly, a depth assembly, and an angle assembly; the depth assembly is slidably connected to the small needle knife assembly; the angle assembly is rotatably disposed outside the depth assembly; the small needle knife assembly includes: a needle core, a base plate, and a cover plate; the needle core is fixedly disposed inside the base plate; the cover plate is fixedly disposed at the upper end of the base plate; a connection hole is fixedly disposed at the end of the needle core; and a handle is fixedly disposed at the top of the cover plate.

[0004] When the above-mentioned patent is used, the combination of depth and angle components enables precise control of puncture depth and angle, which effectively improves the safety and accuracy of the surgery. However, in actual use, because blood and pathogens will adhere to the surface of the small needle knife after use, medical staff are easily scratched when it is retrieved, which can lead to the spread of diseases. Therefore, it is difficult to protect the small needle knife after use.

[0005] To address this, we propose a protective directional cutting needle knife with a nano-DLC coating. Summary of the Invention

[0006] The purpose of this invention is to provide a protective directional cutting needle knife with a nano-DLC coating, which has the advantage of protecting the needle knife after use and solves the problems in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a protective directional cutting needle knife with a nano-DLC coating, comprising a needle knife body and a protective shell for protecting the needle knife body. Both ends of the protective shell are fixedly connected to a rear cover and a front cover for sealing both ends. The front cover is perforated and fixedly connected to a conical shell to prevent leakage of blood and pathogenic microorganisms from inside the needle knife body. Support grooves are symmetrically located on both sides of the inner wall of the protective shell. Moving plates are horizontally movably connected to the inner walls of the support grooves on both sides. An inner spline sleeve is perforated and fixedly connected to the moving plates. A spline shaft is axially movably connected to the inner wall of the inner spline sleeve, and the needle knife body is coaxially fixedly connected to the spline shaft near the conical shell. The protective shell is provided with an adjustment mechanism for driving the needle knife body to extend and retract.

[0008] Preferably, the adjustment mechanism includes a threaded rod that is rotatably connected to the protective housing and driven to rotate by a power mechanism, and an internal threaded sleeve that is rotatably connected to the moving plate near the bottom end, which drives the moving plate to move horizontally reciprocatingly. The internal threaded sleeve is fitted onto the outer contour of the threaded rod and screwed on.

[0009] Preferably, a moving groove is provided at one end of the moving plate near the internal threaded sleeve, and a locking block is connected to the inner wall of the moving groove for lifting and moving. A locking groove is provided on the outer contour of the internal threaded sleeve at the position corresponding to the locking block for locking the position of the internal threaded sleeve. A first spring is fixedly connected to the bottom end of the locking block and the opposite surface of the moving groove to guide the locking block to reset and move.

[0010] Preferably, the internal threaded sleeve is provided with an auxiliary mechanism for driving the spline shaft to drive the small needle knife body to perform reciprocating needle puncture. The auxiliary mechanism includes a cylindrical block fixedly connected to the outer contour of the internal threaded sleeve. A wavy groove for driving the spline shaft to move axially is opened on the outer contour of the cylindrical block. A support block is coaxially fixed to one end of the spline shaft near the cylindrical block, and the end of the support block extends through to the inner wall of the wavy groove and is movably connected.

[0011] Preferably, the movable plate has a movable groove on the side near the locking block, and the movable groove is connected to the inner wall of the movable groove. The inner wall of the movable groove is horizontally movably connected to a movable block. The movable block has an inclined groove at one end near the movable plate to guide the movement of the locking block and unlock the internal threaded sleeve. The end of the locking block away from the internal threaded sleeve is fixedly connected to a movable block, and the end of the movable block passes through the inner wall of the inclined groove and is movably connected.

[0012] Preferably, the inner wall of the conical shell is penetrated and fixedly connected to a rectangular shell, and an airbag is penetrated and fixedly connected to the rectangular shell to seal the through hole of the conical shell, and the airbag is connected to the inner wall of the rectangular shell. The protective shell is provided with a sealing mechanism to guide the airbag to extend or retract.

[0013] Preferably, the sealing mechanism includes a cylindrical shell fixedly connected to the inner wall of the protective shell at the end away from the front cover, and a vent pipe that delivers gas inside the cylindrical shell to the inside of the rectangular shell is penetrated and fixedly connected to the outer contour of the cylindrical shell at the end near the rear cover, and the end of the vent pipe away from the cylindrical shell penetrates to the inner wall of the rectangular shell and is fixedly connected.

[0014] Preferably, the inner wall of the cylindrical shell is axially movably connected to a piston rod for inflating or deflating the airbag, and a circular block is fixedly connected to the end of the piston rod away from the cylindrical shell for the moving plate to push the piston rod to move axially. A second spring is fixedly connected to the opposite surface of the circular block and the cylindrical shell to guide the piston rod to move axially back.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. Through the helical transmission between the threaded rod and the internal threaded sleeve, the moving plate is driven to move horizontally along the support groove, thereby driving the small needle knife body to achieve stable extension and retraction. With the automatic locking mechanism of the locking block, the positional stability of the needle knife in the extended and retracted states is ensured, so that the small needle knife body can be moved and stored inside the protective shell for protection, avoiding scratches to medical staff when retrieving the small needle knife body and preventing the spread of diseases, thus improving the safety of the small needle knife body in use.

[0017] Second, as the threaded rod drives the moving plate to its limit position at one end of the front cover, the locking block automatically releases the locking state of the inner threaded sleeve through the linkage design of the inclined groove and the movable block. This allows the threaded rod to drive the inner threaded sleeve to rotate synchronously with the cylindrical block. The wavy groove on the cylindrical block allows the support block to drive the small needle knife body to perform regular high-frequency acupuncture under the action of the wavy groove. This enables the small needle knife to quickly switch from telescopic adjustment to acupuncture work. Compared with manual operation by medical staff, the frequency and amplitude are more uniform and stable, improving treatment efficiency and safety. It also avoids the problem of medical staff manually performing reciprocating acupuncture on the patient's lesion, which is prone to operational errors and causes harm to the patient.

[0018] Third, through the pneumatic transmission path of the cylindrical shell, the vent pipe and the rectangular shell, the horizontal thrust of the moving plate is converted into the radial expansion and contraction of the airbag, so as to achieve real-time sealing of the through hole in the inner wall of the conical shell when the small needle knife body is retracted. This prevents external contaminants from entering before use and blocks the leakage of blood and pathogenic microorganisms attached to the surface of the needle knife after use, thus eliminating the risk of cross-infection from the source.

[0019] The combined use of the above structures solves the problem that, in actual use, the surface of the small needle knife is covered with blood and pathogenic microorganisms, which can easily cause medical staff to be cut when the knife is retrieved, leading to the spread of disease. Therefore, it is difficult to protect the small needle knife after use. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the part where the movable plate of the present invention is located;

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle;

[0024] Figure 5 This is a three-dimensional cross-sectional view of the part where the movable plate of the present invention is located;

[0025] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point B;

[0026] Figure 7 This is a partial cross-sectional view of the three-dimensional structure of the part where the movable plate of the present invention is located;

[0027] Figure 8 This is an exploded three-dimensional structural diagram of the location of the locking block in this invention;

[0028] Figure 9 This is a three-dimensional cross-sectional view of the portion of the cylindrical shell of the present invention;

[0029] Figure 10 This is a three-dimensional cross-sectional view of the part where the conical shell of the present invention is located.

[0030] In the diagram: 1. Small needle knife body; 2. Protective shell; 201. Support groove; 3. Rear cover; 4. Front cover; 5. Conical shell; 6. Moving plate; 601. Moving groove; 602. Movable groove; 7. Inner spline sleeve; 8. Spline shaft; 9. Threaded rod; 10. Inner threaded sleeve; 101. Locking groove; 11. Locking block; 12. First spring; 13. Moving block; 131. Inclined groove; 14. Movable block; 15. Cylindrical block; 151. Wavy groove; 16. Support block; 17. Rectangular shell; 18. Airbag; 19. Vent tube; 20. Cylindrical shell; 21. Piston rod; 22. Circular block; 23. Second spring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] Please see Figures 1 to 10 This invention provides a technical solution: a protective directional cutting needle knife with a nano-DLC coating, comprising a needle knife body 1 and a protective shell 2 for protecting the needle knife body 1. Both ends of the protective shell 2 are fixedly connected to a rear cover 3 and a front cover 4 for sealing both ends of the protective shell 2. The front cover 4 is perforated and fixedly connected to a conical shell 5 to prevent leakage of blood and pathogenic microorganisms from inside the needle knife body 1. Support grooves 201 are symmetrically located on both sides of the inner wall of the protective shell 2. Moving plates 6 are horizontally movably connected to the inner walls of the support grooves 201 on both sides. An inner spline sleeve 7 is perforated and fixedly connected to the moving plate 6. A spline shaft 8 is axially movably connected to the inner wall of the inner spline sleeve 7, and the needle knife body 1 is coaxially fixed to the end of the spline shaft 8 near the conical shell 5. The protective shell 2 is provided with an adjustment mechanism for driving the needle knife body 1 to extend and retract.

[0034] In use, by setting up the small needle knife body 1, and forming a nano-DLC coating on the blade of the small needle knife body 1, a synergistic effect of ultra-high hardness ≥2500HV and ultra-low friction coefficient ≤0.08 is achieved. Under the angle protection of the directional cutting limiter, soft tissue adhesion release and scar cutting are accurately completed, the cutting resistance is reduced by more than 40%, and the single service life reaches more than 200 times, preventing non-target tissue damage caused by misoperation. The above content is the prior art known to those skilled in the art, so it will not be described in detail here.

[0035] By setting up a protective shell 2, and providing a rear cover 3 and a front cover 4 on the protective shell 2, the rear cover 3 and the front cover 4 are fixedly supported at both ends of the protective shell 2, thus sealing both ends of the protective shell 2. The conical shell 5 provided on the front cover 4 allows the conical shell 5 to be connected to the inside of the protective shell 2. At the same time, the conical shell 5 has a conical shape with a smaller inner diameter and a larger outer diameter, which allows the protective shell 2 to protect the small needle knife body 1 inside, preventing the small needle knife body 1 from being exposed to the outside air and contaminated before use, and preventing the leakage of blood and pathogenic microorganisms from the surface of the small needle knife body 1 inside the protective shell 2 after use.

[0036] The support groove 201 on the protective shell 2 and the movable plate 6 on the support groove 201 allow the movable plate 6 to move horizontally along the inner wall of the support groove 201. The inner spline sleeve 7 on the movable plate 6 is fixedly supported on the movable plate 6. The spline shaft 8 on the inner spline sleeve 7 and the small needle knife body 1 are coaxially fixed to the spline shaft 8, so that the spline shaft 8 can drive the small needle knife body 1 to move axially along the inner wall of the inner spline sleeve 7. This facilitates the subsequent reciprocating acupuncture of the patient's lesion by driving the small needle knife body 1 through the spline shaft 8.

[0037] The adjustment mechanism on the protective housing 2 drives the moving plate 6 to retract and extend the small needle knife body 1. During use, the adjustment mechanism drives the moving plate 6 to extend the small needle knife body 1 out of the protective housing 2 for medical personnel to perform acupuncture on patients. After use, the adjustment mechanism drives the moving plate 6 to retract the small needle knife body 1 into the protective housing 2 for protection, avoiding scratches to medical personnel and preventing the spread of diseases when retrieving the small needle knife body 1.

[0038] Example 2:

[0039] Building upon Example 1, the following is a further step:

[0040] The adjustment mechanism includes a threaded rod 9 that is rotatably connected to the protective housing 2 and driven to rotate by a power mechanism. An internal threaded sleeve 10 is rotatably connected to the moving plate 6 near the bottom end, which drives the moving plate 6 to move horizontally reciprocally. The internal threaded sleeve 10 is fitted on the outer contour of the threaded rod 9 and screwed together.

[0041] A moving groove 601 is provided on one end of the moving plate 6 near the internal threaded sleeve 10. A locking block 11 is connected to the inner wall of the moving groove 601 for vertical movement. A locking groove 101 is provided on the outer contour of the internal threaded sleeve 10 corresponding to the locking block 11 for locking the position of the internal threaded sleeve 10. A first spring 12 is fixedly connected to the bottom end of the locking block 11 and the opposite surface of the moving groove 601 to guide the locking block 11 to reset and move.

[0042] In use, the threaded rod 9 provided on the protective housing 2 is connected to the inner wall of the protective housing 2 for fixed-axis rotation. The power mechanism is a motor after being energized, and the output shaft of the motor is coaxially fixed to the threaded rod 9. Starting the motor enables the motor to drive the threaded rod 9 to reciprocate on the fixed axis. The inner threaded sleeve 10 provided on the moving plate 6 is rotatably supported on the moving plate 6. The moving groove 601 opened on the moving plate 6, and the locking block 11 provided on the moving groove 601, allows the locking block 11 to move along the inner wall of the moving groove 601. The reciprocating connection is achieved through the first spring 12 on the locking block 11 and the locking groove 101 on the inner threaded sleeve 10. Under its own elastic force, the first spring 12 can guide the locking block 11 to move to the inner wall of the locking groove 101. At this time, the locking block 11 locks the position of the inner threaded sleeve 10. The inner threaded sleeve 10 is sleeved on the outer contour of the threaded rod 9 and screwed. As the threaded rod 9 rotates back and forth on a fixed axis, the inner threaded sleeve 10 can drive the moving plate 6 to move horizontally back and forth along the inner wall of the support groove 201 under the action of the threaded rod 9.

[0043] In actual use, such as Figure 2 As shown, before use, the small needle knife body 1 is stored inside the protective shell 2 to prevent it from being exposed to the outside air and becoming contaminated. When the small needle knife body 1 needs to be used, the threaded rod 9 is driven to rotate counterclockwise, causing the threaded rod 9 to drive the moving plate 6 to move horizontally towards the front cover 4. This allows the moving plate 6 to drive the small needle knife body 1 to extend out of the protective shell 2 through the conical hole of the conical shell 5. When the moving plate 6 moves to the limit position at one end of the front cover 4, the moving plate 6 fully extends the small needle knife body 1 out of the inner wall of the protective shell 2, allowing medical personnel to perform acupuncture on the patient. After use, the threaded rod 9 is driven to rotate clockwise, causing the threaded rod 9 to drive the moving plate 6 to retract into the protective shell 2, thus moving and storing the small needle knife body 1 inside the protective shell 2 for protection. This avoids scratching medical personnel when retrieving the small needle knife body 1, preventing the spread of disease and improving the safety of using the small needle knife body 1.

[0044] Example 3:

[0045] Building upon Example 2, the following is a further step:

[0046] The internal threaded sleeve 10 is provided with an auxiliary mechanism for driving the spline shaft 8 to drive the small needle knife body 1 to perform reciprocating needle puncture. The auxiliary mechanism includes a cylindrical block 15 fixedly connected to the outer contour of the internal threaded sleeve 10. The outer contour of the cylindrical block 15 is provided with a wave-shaped groove 151 for driving the spline shaft 8 to move axially back and forth. One end of the spline shaft 8 near the cylindrical block 15 is coaxially fixedly connected to a support block 16, and the end of the support block 16 extends through to the inner wall of the wave-shaped groove 151 and is movably connected.

[0047] The movable plate 6 has a movable groove 602 on the side near the locking block 11, and the movable groove 602 is connected to the inner wall of the movable groove 601. The inner wall of the movable groove 602 is horizontally movably connected to a movable block 13. The movable block 13 has an inclined groove 131 at one end near the movable plate 6 to guide the movement of the locking block 11 and unlock the internal threaded sleeve 10. The end of the locking block 11 away from the internal threaded sleeve 10 is fixedly connected to a movable block 14, and the end of the movable block 14 passes through the inner wall of the inclined groove 131 and is movably connected.

[0048] In use, the cylindrical block 15 on the internal threaded sleeve 10 is fixedly supported on the outer contour of the internal threaded sleeve 10. The support block 16 on the spline shaft 8 is fixedly supported on the spline shaft 8. The support block 16 is movably supported on the inner wall of the wavy groove 151 on the cylindrical block 15. Thus, the support block 16 can support the position of the small needle knife body 1 through the spline shaft 8 under the action of the wavy groove 151.

[0049] The movable block 13, provided on the movable plate 6, can move horizontally along the inner wall of the movable plate 602 via the movable slot 602. The movable block 13, provided on the locking block 11, can movably support itself against the inner wall of the inclined slot 131 via the inclined slot 131. Figure 3 - Figure 8As shown, when the threaded rod 9 rotates counterclockwise and drives the moving plate 6 to the extreme position at one end of the front cover 4, and the end of the moving block 13 abuts against the inner wall of the support groove 201 and retracts towards the inner wall of the movable groove 602, the movable block 14, under the action of the inclined groove 131, can pull the locking block 11 to move and disengage from the inner wall of the locking groove 101. At the same time, the locking block 11 compresses and retracts the first spring 12. At this time, the locking block 11 releases the locking state of the inner threaded sleeve 10, so that the threaded rod 9 can drive the inner threaded sleeve 10 to rotate synchronously on the moving plate 6. First, the medical staff... The staff inserts the small needle knife body 1, which extends from inside the protective shell 2, into the patient's lesion. The internal threaded sleeve 10 drives the cylindrical block 15 to rotate, and the support block 16, under the action of the wave-shaped groove 151, drives the spline shaft 8 and the locking block 11 to perform directional reciprocating needling. This allows for a rapid switch between the small needle knife body 1's extension and retraction adjustment and needling operation. Compared with manual operation by medical staff, the frequency and amplitude are more uniform and stable, avoiding the problem of easy operational errors and harm to the patient caused by manual reciprocating needling of the patient's lesion. This further improves the safety of the small needle knife body 1 during needling.

[0050] When the threaded rod 9 rotates clockwise, the first spring 12, under its own elastic force, can drive the locking block 11 to reset and move to the inner wall of the locking groove 101 and lock the inner threaded sleeve 10. Then, under the action of the threaded rod 9, the inner threaded sleeve 10 can drive the small needle knife body 1 to move and retract to the inner wall of the small needle knife body 1.

[0051] Example 4:

[0052] Building upon Example 3, the following is a further step:

[0053] The inner wall of the conical shell 5 is penetrated and fixedly connected to a rectangular shell 17. An airbag 18 is penetrated and fixedly connected to the rectangular shell 17 to seal the through hole of the conical shell 5. The airbag 18 is connected to the inner wall of the rectangular shell 17. The protective shell 2 is provided with a sealing mechanism to guide the airbag 18 to extend or retract.

[0054] The inner spline sleeve 7 is fixedly supported on the conical shell 5 by the rectangular shell 17 provided on the conical shell 5. The airbag 18 provided on the rectangular shell 17 allows the airbag 18 to communicate with the inner wall of the rectangular shell 17. The sealing mechanism provided on the protective shell 2 allows the sealing mechanism to inflate or de-inflate the inside of the spline shaft 8, thereby sealing or opening the through hole in the inner wall of the conical shell 5.

[0055] The sealing mechanism includes a cylindrical shell 20 fixedly connected to the inner wall of the protective shell 2 at the end away from the front cover 4. A vent pipe 19 is fixedly connected to the outer contour of the cylindrical shell 20 near the rear cover 3 to transport the gas inside the cylindrical shell 20 to the inside of the rectangular shell 17. The end of the vent pipe 19 away from the cylindrical shell 20 passes through and is fixedly connected to the inner wall of the rectangular shell 17.

[0056] The inner wall of the cylindrical housing 20 is axially movably connected to a piston rod 21 for inflating or deflating the airbag 18. A circular block 22 is fixedly connected to the end of the piston rod 21 away from the cylindrical housing 20, which is used by the moving plate 6 to push the piston rod 21 to move axially. A second spring 23 is fixedly connected to the opposite surface of the circular block 22 and the cylindrical housing 20 to guide the piston rod 21 to move axially back.

[0057] In use, the cylindrical shell 20 provided on the protective shell 2 is fixedly supported on the protective shell 2, and the vent pipe 19 provided on the cylindrical shell 20 allows the vent pipe 19 to connect the inner wall of the cylindrical shell 20 and the inner wall of the rectangular shell 17. The piston rod 21 provided on the cylindrical shell 20, and the circular block 22 provided on the piston rod 21, can drive the circular block 22 to move axially on the inner wall of the cylindrical shell 20. The second spring 23 provided on the circular block 22 supports the position of the piston rod 21, so as to guide the piston rod 21 to move axially for subsequent reset.

[0058] In actual use, such as Figure 2 , Figure 3 , Figure 9 and Figure 10 As shown, when the moving plate 6 moves to the extreme position away from the front cover 4 and moves the small needle knife body 1 to retract inside the protective shell 2, and the moving plate 6 abuts against the circular block 22 and pushes the piston rod 21 to move to the cylindrical shell 20 near the vent pipe 19, the second spring 23 is in a contracted state under the action of the circular block 22. At this time, the piston rod 21 delivers the air inside the cylindrical shell 20 through the vent pipe 19 to the rectangular shell 17 and the airbag 18, so that the airbag 18 extends into the through hole in the inner wall of the front cover 4 for sealing, which improves the sealing performance of the protective shell 2 and prevents the small needle knife body 1 from being contaminated by the outside before use and the leakage of blood and pathogenic microorganisms on the small needle knife body 1 after use.

[0059] When the moving plate 6 moves towards the front cover 4, the second spring 23, under its own elastic force, guides the circular block 22 and the piston rod 21 to move back to the end away from the vent pipe 19. The internal air pressure of the cylindrical housing 20 near the vent pipe 19 is negative. As a result, the piston rod 21 can draw air from the rectangular housing 17 and the airbag 18 into the cylindrical housing 20 through the vent pipe 19. The airbag 18 can then retract onto the inner wall of the rectangular housing 17 and release the blockage of the through hole on the inner wall of the conical housing 5, thus avoiding any impact on the extension of the small needle knife body 1. This achieves real-time sealing of the through hole on the inner wall of the conical housing 5 when the small needle knife body 1 retracts, preventing external contaminants from entering before use and blocking the leakage of blood and pathogenic microorganisms attached to the surface of the small needle knife body 1 after use, thereby eliminating the risk of cross-infection from the source.

[0060] Furthermore, the existing device can protect the small needle knife after use during actual use, making it convenient to use and superior to traditional products.

[0061] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective directional cutting needle knife with a nano-DLC coating, characterized in that: The device includes a small needle knife body (1) and a protective shell (2) for protecting the small needle knife body (1). Both ends of the protective shell (2) are fixedly connected to a rear cover (3) and a front cover (4) for sealing both ends of the protective shell (2). The end of the front cover (4) is penetrated and fixedly connected to a conical shell (5) to prevent leakage of blood and pathogenic microorganisms inside the small needle knife body (1). Support grooves (201) are provided on both sides of the inner wall of the protective shell (2). The inner walls of the support grooves (201) on both sides are horizontally connected to a moving plate (6). An inner spline sleeve (7) is penetrated and fixedly connected to the moving plate (6). The inner wall of the inner spline sleeve (7) is axially connected to a spline shaft (8). The small needle knife body (1) and the spline shaft (8) are coaxially fixedly connected at one end near the conical shell (5). The protective shell (2) is provided with an adjustment mechanism for driving the small needle knife body (1) to move in a telescopic manner.

2. The protective directional cutting needle knife with a nano-DLC coating according to claim 1, characterized in that: The adjustment mechanism includes a threaded rod (9) that is rotatably connected to the protective housing (2) by a power mechanism and is driven to rotate. The moving plate (6) is rotatably connected to an internal threaded sleeve (10) that is driven to move horizontally by the threaded rod (9) near the bottom end. The internal threaded sleeve (10) is fitted on the outer contour of the threaded rod (9) and screwed in.

3. A protective directional cutting needle knife with a nano-DLC coating according to claim 2, characterized in that: A moving groove (601) is provided at one end of the moving plate (6) near the inner threaded sleeve (10). A locking block (11) is connected to the inner wall of the moving groove (601) for lifting and moving. A locking groove (101) is provided on the outer contour of the inner threaded sleeve (10) corresponding to the locking block (11) for locking the position of the inner threaded sleeve (10). A first spring (12) is fixedly connected to the bottom end of the locking block (11) and the opposite surface of the moving groove (601) to guide the locking block (11) to reset and move.

4. A protective directional cutting needle knife with a nano-DLC coating according to claim 3, characterized in that: The internal threaded sleeve (10) is provided with an auxiliary mechanism for driving the spline shaft (8) to drive the small needle knife body (1) to perform reciprocating needle puncture. The auxiliary mechanism includes a cylindrical block (15) fixedly connected to the outer contour of the internal threaded sleeve (10). A wave-shaped groove (151) for driving the spline shaft (8) to move axially is opened on the outer contour of the cylindrical block (15). A support block (16) is coaxially fixed to one end of the spline shaft (8) near the cylindrical block (15), and the end of the support block (16) extends through to the inner wall of the wave-shaped groove (151) and is movably connected.

5. A protective directional cutting needle knife with a nano-DLC coating according to claim 4, characterized in that: The movable plate (6) has a movable groove (602) on the side near the locking block (11), and the movable groove (602) is connected to the inner wall of the movable groove (601). The inner wall of the movable groove (602) is horizontally connected to a movable block (13). The movable block (13) has an inclined groove (131) at one end near the movable plate (6) to guide the locking block (11) to move and unlock the inner threaded sleeve (10). The locking block (11) is fixedly connected to a movable block (14) at one end away from the inner threaded sleeve (10), and the end of the movable block (14) extends through to the inner wall of the inclined groove (131) and is movably connected.

6. A protective directional cutting needle knife with a nano-DLC coating according to claim 1, characterized in that: The inner wall of the conical shell (5) is penetrated and fixedly connected to a rectangular shell (17). An airbag (18) is penetrated and fixedly connected to the rectangular shell (17) to seal the through hole of the conical shell (5). The airbag (18) is connected to the inner wall of the rectangular shell (17). The protective shell (2) is provided with a sealing mechanism to guide the airbag (18) to extend or retract.

7. A protective directional cutting needle knife with a nano-DLC coating according to claim 6, characterized in that: The sealing mechanism includes a cylindrical shell (20) fixedly connected to the inner wall of the protective shell (2) away from the front cover (4). The outer contour of the cylindrical shell (20) near the rear cover (3) is penetrated and fixedly connected to a vent pipe (19) for transporting gas inside the cylindrical shell (20) to the inside of the rectangular shell (17). The end of the vent pipe (19) away from the cylindrical shell (20) is penetrated to the inner wall of the rectangular shell (17) and fixedly connected.

8. A protective directional cutting needle knife with a nano-DLC coating according to claim 7, characterized in that: The inner wall of the cylindrical shell (20) is axially connected to a piston rod (21) for inflating or deflating the airbag (18). A circular block (22) is fixedly connected to the end of the piston rod (21) away from the cylindrical shell (20) for the moving plate (6) to push the piston rod (21) to move axially. A second spring (23) is fixedly connected to the opposite surface of the circular block (22) and the cylindrical shell (20) to guide the piston rod (21) to move axially back.

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