An anal fistula trephine

Abstract

This invention discloses an anal fistula cutting device, comprising a left shell, a right shell, and a front shell. The left and right shells are symmetrically arranged to form a main chamber. The rear end of the front shell is fixed inside the main chamber, and the interior of the front shell is a cutting blade chamber. The cutting blade chamber is elongated and cylindrical, and the cutting blade moves back and forth within it. A drive assembly is installed in the lower part of the main chamber, a transmission assembly is installed in the middle of the main chamber, a cutting assembly is installed at the front end of the transmission assembly, a switch fixing plate is installed inside the main chamber, an activation assembly is installed at a corner inside the main chamber, and a return assembly is connected to the switch fixing plate. This anal fistula cutting device is simple to operate, avoiding extensive muscle and nerve damage caused by fistula endotomy, effectively separating fistula polyps, reducing postoperative complications, and alleviating the surgical intensity for doctors and the psychological stress for patients.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to an anal fistula cutting device. Background Technology

[0002] An anal fistula is a granulomatous tract around the anus, and also an inflammatory disease of the skin and soft tissues. This inflammatory sinus tract connects the rectum and anal canal with the surrounding soft tissues, containing inflammatory granulation tissue or filled with purulent tissue, with a small amount of discharge draining from the opening. In simple terms, an anal fistula is like a "tunnel" between the rectal wall and the perianal skin, an infectious channel between the anal canal and the perianal skin. It primarily affects the anal canal and the surrounding muscle tissue, and is a common and frequently occurring anorectal disease. Its internal opening is located near the dentate line, and its external opening is located on the perianal skin, often failing to heal for many years. Most anal fistulas form after the rupture or incision and drainage of an anorectal abscess. As the abscess gradually shrinks, intestinal contents continue to enter the cavity. During the healing and shrinking process, scarring often forms, hindering drainage and healing. Over time, many scar tissues accumulate around the cavity, forming a chronic infectious tract. The clinical manifestations of anal fistula include purulent discharge. Newly formed fistulas discharge more purulent discharge, and the secretions irritate the skin, causing itching and discomfort. When the external opening is blocked or falsely healed, purulent fluid accumulates in the fistula, causing local swelling, pain, and even fever.

[0003] Currently, the primary clinical treatment method is surgery. This involves inserting a probe through the external opening into the internal opening of the fistula and then removing the fistula along the direction of the probe, creating a "V"-shaped incision. This surgical treatment, because it involves cutting open the fistula to create an incision, has several risks: firstly, it can cause damage to the anal muscles and nerve tissue; secondly, the incision generally cannot be sutured and requires a long healing time; and thirdly, it may cause anal deformities, air and fluid leakage, and fecal incontinence. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an anal fistula cutting device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an anal fistula rotary cutter, comprising a left shell, a right shell, and a front shell; the left shell and the right shell are symmetrically arranged to form a main chamber, the rear end of the front shell is fixed inside the main chamber, and the interior of the front shell is a rotary cutter chamber;

[0006] It also includes a drive assembly installed at the bottom of the main chamber, a transmission assembly installed in the middle of the main chamber, a rotary cutting assembly installed at the front end of the transmission assembly, a switch fixing plate installed inside the main chamber, an excitation assembly installed at the corner of the main chamber, and a return assembly connected to the switch fixing plate.

[0007] The drive assembly includes a battery, a geared motor, a drive gear, and a fixed base; the fixed base is installed in the main chamber, the geared motor is installed on the fixed base, the battery is connected to the geared motor, and the drive gear is connected to the output end of the geared motor.

[0008] The transmission assembly includes a large gear and a central shaft; the large gear meshes with a long drive gear; the central shaft is mounted on a fixed base; the large gear is fitted onto the central shaft, which is coaxially arranged with the rotary cutting blade chamber; the front section of the central shaft has an internal threaded hole, and the rear section of the central shaft has a transmission external thread.

[0009] The large gear includes an outer gear ring, an inner gear ring, and a long tube body, with the long tube body fixed to the end face of the large gear.

[0010] The rotary cutting assembly includes a rotary cutting blade and a rotary cutting base. The rotary cutting base includes a fixed end, a metal pad and a silicone pad that are sequentially installed on the fixed end, wherein the metal pad is disposed between the silicone pad and the fixed end, and the rear end of the fixed end is provided with an external threaded post. The rotary cutting blade is installed on a long tube body, and the external threaded post of the fixed end is screwed into an internal threaded hole.

[0011] The front end of the rotary cutter is an inner single-sided blade with a cylindrical cavity inside. The rear end has a through hole with a fixing arc plate at the edge of the through hole.

[0012] The excitation assembly includes an excitation handle and a rotary cutting position switch. The upper end of the excitation handle is provided with an arc-shaped protrusion, and the lower side of the rotary cutting position switch is provided with an elastic pressure plate. The two sides of the excitation handle are respectively hinged to the left and right housings, and the rotary cutting position switch is mounted on the switch fixing plate.

[0013] The return assembly includes a return drag block and a return position switch. The return drag block includes a drag plate and a positioning baffle fixed on the drag plate. A pressure block is provided on the lower side of the positioning baffle, and an elastic pressure plate is provided on the upper side of the return position switch.

[0014] The left housing is provided with a return slide groove, and the slide plate is disposed in the return slide groove and moves back and forth along the slide groove.

[0015] The positioning baffle has a U-shaped groove structure, including a front baffle and a rear baffle. The external gear ring is located in the U-shaped groove of the positioning baffle, and the rear end face of the external gear ring is in contact with the rear baffle 3-2-2 in the initial state.

[0016] The technical effects and advantages of this invention are as follows:

[0017] The procedure is simple to perform, avoiding extensive muscle and nerve damage caused by fistula incision surgery, effectively separating fistula polyps, reducing postoperative complications, and alleviating the surgical intensity for doctors and the psychological stress for patients. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of the present invention;

[0019] Figure 2 This is a perspective view of the internal structure of the present invention;

[0020] Figure 3 This is a perspective view of the internal structure of the present invention;

[0021] Figure 4 This is a perspective view of the internal structure of the present invention;

[0022] Figure 5 This is a cross-sectional view of the present invention;

[0023] Figure 6 This is a schematic diagram of the excitation component and return component of the present invention;

[0024] Figure 7 This is a schematic diagram of the excitation component and return component of the present invention;

[0025] Figure 8 This is a cross-sectional view of the large gear of the present invention;

[0026] Figure 9 This is a cross-sectional view of the cutting blade of the present invention;

[0027] Figure 10 This is a schematic diagram of the drive gear of the present invention;

[0028] Figure 11 This is a cross-sectional view of the rotary cutting component of the present invention;

[0029] Figure 12 This is a schematic diagram of the left casing of the present invention;

[0030] Figure 13 This is a schematic diagram of the long tube structure of the present invention;

[0031] Figure 14 This is a schematic diagram of the positioning baffle structure of the present invention;

[0032] Figure 15 This is a schematic diagram of the control principle of the geared motor of the present invention.

[0033] The attached diagram is labeled as follows: 1. Right housing; 2. Left housing; 3. Return assembly; 3-1. Cargo slide; 3-2. Positioning baffle; 3-2-1. Front baffle; 3-2-2. Rear baffle; 3-3. Pressure block; 4. Front housing; 5. Rotary cutting assembly; 5-1. Fixed end; 5-2. Metal pad; 5-3. Silicone pad; 6. Main chamber; 7. Battery; 8. Gear motor; 9. Fixed base; 10. Transmission assembly; 10-1. Internal gear ring; 10-2. External gear ring; 10-3. Long tube body ; 11. Excitation assembly; 11-1. Arc-shaped protrusion; 12. Return position switch; 13. Rotary cutting position switch; 14. Switch fixing plate; 15. Drive long gear; 16. Gear mounting plate; 18. Central shaft; 18-1. Transmission external thread; 18-2. Internal threaded hole; 19. Rotary cutting blade; 19-1. Inner single-sided blade; 19-2. Cylindrical cavity; 19-3. Through hole; 19-4. Fixing arc plate; 20. Rotary cutting blade chamber; 21. Elastic pressure plate; 22. Return slide groove. Implementation

[0034] 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.

[0035] Refer to the instruction manual appendix Figure 1-15 The embodiment of the fistula cutting device includes a left housing 2, a right housing 1 and a front housing 4; the left housing 2 and the right housing 1 are symmetrically arranged to form a main chamber 6, the rear end of the front housing 4 is fixed in the main chamber 6, and the interior of the front housing 4 is a cutting blade chamber 20; the cutting blade chamber 20 is long and cylindrical, and the cutting blade 19 moves back and forth in the cutting blade chamber 20.

[0036] The drive assembly is installed at the lower part of the main chamber 6, the transmission assembly 10 is installed in the middle of the main chamber 6, the rotary cutting assembly 5 is installed at the front end of the transmission assembly 10, the switch fixing plate 14 is installed inside the main chamber 6, the excitation assembly 11 is installed at the corner inside the main chamber 6, and the return assembly 3 is connected to the switch fixing plate 14.

[0037] The drive assembly includes a battery 7, a geared motor 8, a drive gear 15, and a fixed base 9. The fixed base 9 is installed in the main chamber 6, the geared motor 8 is installed on the fixed base 9, the battery 7 is connected to the geared motor 8, and the drive gear 15 is connected to the output end of the geared motor 8.

[0038] The transmission assembly 10 includes a large gear and a central shaft 18; the large gear meshes with the drive long gear 15; the central shaft 18 is mounted on the fixed base 9; the large gear is fitted on the central shaft 18; the central shaft 18 is coaxially arranged with the rotary cutting blade chamber 20; the front section of the central shaft 18 is provided with an internal threaded hole 18-2; and the rear end of the central shaft 18 is provided with a transmission external thread 18-1.

[0039] The large gear includes an outer gear ring 10-2, an inner gear ring 10-1, and a long tube body 10-3, with the long tube body 10-3 fixed to the end face of the large gear.

[0040] The rotary cutting assembly 5 includes a rotary cutting blade 19 and a rotary cutting seat. The rotary cutting seat includes a fixed end 5-1, a metal pad 5-2 and a silicone pad 5-3 sequentially mounted on the fixed end 5-1. The metal pad 5-2 is positioned between the silicone pad 5-3 and the fixed end 5-1. The rear end of the fixed end 5-1 is provided with an external threaded post. The rotary cutting blade 19 is mounted on the long tube body 10-3. The external threaded post of the fixed end 5-1 is screwed into the internal threaded hole 18-2.

[0041] The rotary cutter 19 has an inner single-sided blade 19-1 at the front end and a cylindrical cavity 19-2 inside. The rear end has a through hole 19-3, and a fixing arc plate 19-4 is provided on the edge of the through hole 19-3. The through hole 19-3 is coaxially arranged with the central shaft 18; the fixing arc plate 19-4 is interference-fitted onto the long tube body 10-3.

[0042] The excitation assembly 11 includes an excitation handle and a rotary cutting position switch 13. The upper end of the excitation handle is provided with an arc-shaped protrusion 11-1, and the lower side of the rotary cutting position switch 13 is provided with an elastic pressure plate 21. The two sides of the excitation handle are respectively hinged to the left housing 2 and the right housing 1, and the rotary cutting position switch 13 is mounted on the switch fixing plate 14.

[0043] The return assembly 3 includes a return drag block and a return position switch 12. The return drag block includes a drag plate 3-1 and a positioning baffle 3-2 fixed on the drag plate 3-1. A pressure block 3-3 is provided on the lower side of the positioning baffle 3-2, and an elastic pressure plate 21 is provided on the upper side of the return position switch 14.

[0044] The left housing 2 is provided with a return slide 22, and the slide plate 3-1 is set in the return slide 22 and moves back and forth along the slide 22.

[0045] The anal fistula cutter of the present invention operates as follows: First, the cutting seat of the activation component 11 is removed from the central shaft 18. Then, the central shaft 18 is passed through the fistula and reinstalled onto the cutting seat of the activation component 11 via threads. After adjusting the angle and orientation of the anal fistula cutter, the activation handle is activated. The arc-shaped protrusion 11-1 above the activation handle presses against the elastic pressure plate 21 to activate the activation circuit. At this time, the reduction motor 8 rotates forward, driving the drive gear 15 to rotate, which in turn drives the large gear meshing with the drive gear 15. The large gear rotates forward around the central shaft 18. Due to the meshing of the internal gear ring 10-1 and the transmission external thread 18-1, the large gear rotates and moves forward, driving the cutting blade 19 to rotate and move forward through the long tube 10-3. The inner single-side blade 19-1 of the cutting blade 19 cuts off the polyp in the fistula and stores it in the cylindrical cavity 19-2 during the process of rotating and advancing. When the inner single-sided blade 19-1 contacts the silicone pad 5-3, the geared motor 8 automatically stops running due to excessive resistance, or the positioning baffle 3-2 presses down the elastic pressure plate 21 of the return position switch 12, connecting the reverse circuit of the geared motor 8, and the above-mentioned rotary cutting process ends.

[0046] The return process of the anal fistula rotary cutter is as follows: The positioning baffle 3-2 has a U-shaped groove structure, including a front baffle 3-2-1 and a rear baffle 3-2-2. The external gear ring 10-2 is located within the U-shaped groove of the positioning baffle 3-2, and its rear end face is initially in contact with the rear baffle 3-2-2. During the rotary cutting process, the front end face of the external gear ring 10-2 contacts the rear baffle 3-2-2 and drives the positioning baffle 3-2 forward. The positioning baffle 3-2 continuously presses down the elastic pressure plate 21 of the return position switch 12 until the reverse circuit of the reduction motor 8 is activated. The reduction motor 8 rotates in the reverse direction, driving the long gear 15 to drive the large gear to rotate in the reverse direction. The long tube 10-3 rotates in the reverse direction while retracting, simultaneously driving the rotary cutter 19 to rotate in the reverse direction while retracting. When the rear end face of the external gear ring 10-2 contacts the rear baffle 3-2-2, it pushes the positioning baffle 3-2 to move along the return slide groove 22 until the pressure block 3-3 returns to the initial position. The elastic pressure plate 21 of the return position switch 12 then springs up again, disconnecting the reverse circuit of the geared motor 8, and the return process ends.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fistula cutting device, characterized in that: It includes a left shell, a right shell, and a front shell; the left shell and the right shell are symmetrically arranged to form a main chamber, the rear end of the front shell is fixed in the main chamber, and the interior of the front shell is a rotary cutting blade chamber; It also includes a drive assembly installed at the bottom of the main chamber, a transmission assembly installed in the middle of the main chamber, a rotary cutting assembly installed at the front end of the transmission assembly, a switch fixing plate installed inside the main chamber, an excitation assembly installed at the corner of the main chamber, and a return assembly connected to the switch fixing plate. The transmission assembly includes a large gear and a central shaft; the large gear meshes with a long drive gear; the central shaft is mounted on a fixed base; the large gear is fitted onto the central shaft, which is coaxially arranged with the rotary cutting blade chamber; the front section of the central shaft has an internal threaded hole, and the rear section of the central shaft has a transmission external thread; the large gear includes an external gear ring, an internal gear ring, and a long tube body, which is fixed to the end face of the large gear. The rotary cutting assembly includes a rotary cutting blade and a rotary cutting base. The rotary cutting base includes a fixed end, a metal pad and a silicone pad that are sequentially installed on the fixed end, wherein the metal pad is disposed between the silicone pad and the fixed end, and the rear end of the fixed end is provided with an external threaded post. The rotary cutting blade is installed on a long tube body, and the external threaded post of the fixed end is screwed into an internal threaded hole.

2. The anal fistula cutting device according to claim 1, characterized in that: The drive assembly includes a battery, a geared motor, a drive gear, and a fixed base; the fixed base is installed in the main chamber, the geared motor is installed on the fixed base, the battery is connected to the geared motor, and the drive gear is connected to the output end of the geared motor.

3. The anal fistula cutting device according to claim 1, characterized in that: The front end of the rotary cutter is an inner single-sided blade with a cylindrical cavity inside. The rear end has a through hole with a fixing arc plate at the edge of the through hole.

4. The anal fistula cutting device according to claim 1, characterized in that: The excitation assembly includes an excitation handle and a rotary cutting position switch. The upper end of the excitation handle is provided with an arc-shaped protrusion, and the lower side of the rotary cutting position switch is provided with an elastic pressure plate. The two sides of the excitation handle are respectively hinged to the left and right housings, and the rotary cutting position switch is mounted on the switch fixing plate.

5. The anal fistula cutting device according to claim 1, characterized in that: The return assembly includes a return drag block and a return position switch. The return drag block includes a drag plate and a positioning baffle fixed on the drag plate. A pressure block is provided on the lower side of the positioning baffle, and an elastic pressure plate is provided on the upper side of the return position switch.

6. The anal fistula cutting device according to claim 5, characterized in that: The left housing is provided with a return slide groove, and the slide plate is disposed in the return slide groove and moves back and forth along the slide groove.

7. The anal fistula cutting device according to claim 5, characterized in that: The positioning baffle has a U-shaped groove structure, including a front baffle and a rear baffle; the external gear ring is located in the U-shaped groove of the positioning baffle, and the rear end face of the external gear ring is in contact with the rear baffle in the initial state.

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