CN217310413U - Draw hook used in type II first gill-splitting fistula excision - Google Patents

Abstract

The utility model discloses a drag hook that uses in the first branchial fistula excision of II type belongs to medical instrument technical field, including handheld hook portion, handheld straight rod portion, telescopic link subassembly, rotation regulation structure and drag hook body, the front end of handheld straight rod portion is equipped with handheld hook portion, and handheld hook portion and handheld straight rod portion integrated into one piece, and the rear end of handheld straight rod portion can be dismantled with telescopic link subassembly's front end and be connected, and telescopic link subassembly's rear end and drag hook body rotate through rotation regulation structure and are connected, and have the contained angle between drag hook body and the telescopic link subassembly. The included angle between the retractor body and the telescopic rod component is adjusted by utilizing the rotary adjusting structure and the retractor body, so that the retractor body is more attached to the incision direction of a patient, and more operation visual fields are exposed; still utilize telescopic link subassembly, adjust the drag hook body and the distance of handheld straight rod portion, make operator's hand keep away from the incision position to avoid sheltering from the operation field of vision.

Description

Draw hook used in type II first gill-splitting fistula excision

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to drag hook that uses in the first branchia of II type splits fistulotomy.

Background

The primary fistula is a congenital malformation, believed to be a fistula formed by residual gill-splitting cells at the embryonic stage. The external orifice of the fistula is usually located at the orifice near the earlobe, behind the ear or the angle of mandible, and the internal orifice of the fistula can reach the external auditory canal. When inflammation is combined, red swelling, pus discharge and other manifestations can appear, and the clinical manifestations can be divided into two types according to the fistula site and the pathological results: form I and form II. Type II fistulas are deeper in the anatomy, more complex in anatomical deformity, and more important in adjacent tissues. The external orifice of type II fistula is usually located near the angle of mandible, and the fistula extends upward and deep, often through the deep and superficial lobes of parotid, reaching deeply into the external auditory canal, where the course of the fistula is closely related to the facial nerve. Surgical resection is the only way to treat the disease completely. Type II primary gill-fissure fistulas run long and penetrate deep tissues, with high requirements for surgical field exposure. In addition, the cranial area of the facial nerve is near the internal opening of the fistula, and the facial nerve is easily injured in the process of cutting the fistula.

When performing the excision operation, the incision is spread by using a draw hook, so that the fistula is fully exposed. In actual operation, because the fistula has narrow and deep vision, the front end of the existing drag hook is too wide and too short compared with the surgical lacuna, the vision can not be well exposed, and the existing drag hook has no means for protecting facial nerves, so that facial nerve injury is easily caused.

Therefore, it is an urgent technical problem for those skilled in the art to provide a novel retractor to fully expose the operation field and protect the facial nerve from being damaged.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a drag hook that uses in the first branchial fissure fistula excision of type II to solve among the prior art because drag hook front end length short and the problem that blocks that medical personnel observe the operation wound that leads to.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a drag hook that uses in the first branchial fissure fistula excision of II type, includes handheld hook portion, handheld straight pole portion, telescopic link subassembly, rotation regulation structure and drag hook body, the front end of handheld straight pole portion is equipped with handheld hook portion, just handheld hook portion with handheld straight pole portion integrated into one piece, the rear end of handheld straight pole portion with telescopic link subassembly's front end can be dismantled and be connected, telescopic link subassembly the rear end with the drag hook body passes through rotation regulation structure rotates and connects, just the drag hook body with the contained angle has between the telescopic link subassembly.

Further, the rotation regulation structure includes button, ratchet, pawl and expansion disc, the drag hook body is through pressing the button is in rotate on the telescopic link subassembly, the button overcoat is equipped with ratchet and expansion disc, the expansion disc covers the part on the ratchet, ratchet and expansion disc are located telescopic link subassembly with between the drag hook body, just the rotation centre of a circle of ratchet is fixed to be located on the drag hook body, the ratchet with the drag hook body rotates around the axle center is synchronous, the pawl articulates on the telescopic link subassembly, just the pawl with ratchet meshing on the ratchet or support on the ratchet on the expansion disc.

Furthermore, an arc-shaped open groove is formed in the arc-shaped edge of the movable disc, a protruding stop point is arranged on the covered side edge of the ratchet wheel, and the protruding stop point moves in the arc-shaped open groove.

Further, the telescopic rod component comprises an outer tube, an inner tube and an inner locking structure, wherein the tube diameter of the inner tube is smaller than that of the outer tube, the front end of the inner tube is in threaded connection with the rear end of the handheld straight rod part, the rear end of the inner tube is slidably sleeved in the outer tube, the rear end of the inner tube is provided with the inner locking structure, the inner tube and the outer tube are locked by the inner locking structure, and the rear end of the outer tube is rotatably connected with the drag hook body.

Further, the internal lock structure includes taper bolt, inflation cover and anticreep head, the fixed anticreep head that is equipped with on taper bolt's the first terminal surface, taper bolt's second terminal surface with the rear end fixed connection of inner tube, the diameter of taper bolt's first terminal surface is less than the diameter of its second terminal surface, the inflation ways is established taper bolt's outside, just the inflation cover with the taper bolt spiro union.

Further, the expansion sleeve is vertically arranged on the inner wall of the outer pipe in a sliding mode, and the expansion sleeve is connected with the outer pipe through a spline.

Furthermore, an opening is formed in the expansion sleeve along the axial direction, and the section of the expansion sleeve is C-shaped.

Further, still include first cushion cover, handheld crotch portion overcoat is equipped with first cushion cover.

Furthermore, the retractor also comprises a second cushion sleeve, and the second cushion sleeve is sleeved outside the retractor body.

Furthermore, the handheld straight rod part is provided with anti-skid grains.

The utility model has the advantages of as follows:

according to the surgical retractor, the rotating adjusting structure and the retractor body are utilized, the incision directions of patients are different, and the rotating adjusting structure is used for adjusting the included angle between the retractor body and the telescopic rod assembly, so that the retractor body is more attached to the incision direction of the patients, the retractor body is prevented from occupying too many surgical lacunas, more surgical fields are exposed, and the completion of resection surgery is facilitated; the telescopic rod component is further utilized, on one hand, the distance between the retractor body and the handheld straight rod part is adjusted through the telescopic function of the telescopic rod component, so that the hand of an operator is far away from the incision position, and the condition that the operation visual field is shielded is avoided; on the other hand telescopic bar subassembly can be dismantled with handheld straight rod portion and be connected, and telescopic bar subassembly and drag hook body are directly changed to the accessible, replace the drag hook body of different angles to expose the operation field of vision, accomplish the excision operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an initial state view of the outer tube and retractor body;

FIG. 3 is a view showing the angle of the retractor body;

FIG. 4 is an initial state diagram of the rotation adjustment mechanism;

FIG. 5 is a state view of the ratchet wheel clockwise movement provided by the rotation adjustment structure;

FIG. 6 is a state view of the ratchet and movable disk clockwise movement provided by the rotational adjustment mechanism;

FIG. 7 is a state view of the ratchet wheel counterclockwise movement provided by the rotation adjustment structure;

FIG. 8 is a state view of the ratchet and movable disk counterclockwise movement provided by the rotational adjustment mechanism;

FIG. 9 is a cross-sectional view of the telescoping pole assembly prior to deadlocking;

FIG. 10 is a cross-sectional view of the telescoping pole assembly after it has been locked;

FIG. 11 is a schematic structural view of the expansion shell;

in the figure:

1, holding a bent hook part by hand; 2, holding the straight rod part by hand; 3 a telescopic rod assembly; 301 an outer tube; 302 an inner tube; 303 an inner locking structure; 3031 a taper bolt; 3032 expanding sleeve; 3033 preventing head falling; 4, rotating the adjusting structure; 401 key press; 402, ratchet wheel; 403 a pawl; 404 an active disk; 5, pulling the hook body; 6, arc grooving; 7, protruding stop points; 8 a first cushion cover; 9 a second cushion cover; 10 anti-skid lines; 11 splines; 12 are open.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to solve the related technical problem that exists among the prior art, this application embodiment provides a drag hook that uses in the first branchiomycosis fistulotomy of II type, aims at solving current drag hook front end short, can't closely laminate incision scheduling problem, realizes fully exposing the effect in operation field of vision. As shown in fig. 1-11, the retractor specifically comprises a handheld hook part 1, a handheld straight rod part 2, a telescopic rod component 3, a rotation adjusting structure 4 and a retractor body 5. The front end of the handheld straight rod part 2 is provided with a handheld hook part 1, and the handheld hook part 1 and the handheld straight rod part 2 are integrally formed. When the hand-held straight rod part is used, a user holds the hand-held straight rod part 2 by the thumb and the forefinger, and the rest fingers are propped against the bent part of the hand-held hook part 1, so that a good holding posture can be kept, and the hand is prevented from being separated from the device. The rear end of handheld straight pole portion 2 is equipped with telescopic link assembly 3, and telescopic link assembly 3's rear end is equipped with drag hook body 5, and when the operation, in stretching into patient's incision with the drag hook main part, all the other parts are stayed outside patient's wound, can not touch patient's wound. And the hook of the drag hook main body is propped against the edge of the incision of the patient, and the user pulls the device outwards to enable the hook of the drag hook main body to bear the counterclockwise acting force. The drag hook body 5 is of a telescopic structure, is provided with a clamping point in the drag hook body, can freely stretch and retract, and is capable of adapting to wounds with different depths by changing the length of the drag hook body 5.

The first soft cushion cover 8 is sleeved outside the handheld hook part 1, so that fingers can be supported on the first soft cushion cover 8 to prevent hurting; the anti-skid lines 10 are arranged on the handheld straight rod part 2, fingers are held at the anti-skid lines 10, the fingers are prevented from sliding on the handheld straight rod part 2, and the situation that the holding position cannot be determined during holding is avoided; the position of the facial nerve out of the skull is near the inner opening of the fistula, and the facial nerve is easily injured in the process of cutting the fistula. The second cushion cover 9 is soft, and the second cushion cover 9 is sleeved on the outer portion of the drag hook body 5, so that facial nerves are damaged when the contact surface of the drag hook body 5 is prevented from being nervous, and other diseases of a patient can not appear. The first and second cushion covers 8, 9 are replaceable.

The rear end of the handheld straight rod part 2 is detachably connected with the front end of the telescopic rod component 3. On one hand, the distance between the retractor body 5 and the handheld straight rod part 2 is adjusted through the expansion of the telescopic rod component 3, so that the hand of an operator is far away from the incision position, and the operation visual field is prevented from being shielded; on the other hand telescopic link assembly 3 can be dismantled with handheld straight rod portion 2 and be connected, and telescopic link assembly 3 and drag hook body 5 are directly changed to the accessible, replace the drag hook body 5 of different angles to expose the operation field of vision, accomplish the excision operation.

The telescopic rod component 3 comprises an outer tube 301, an inner tube 302 and an inner locking structure 303, the tube diameter of the inner tube 302 is smaller than that of the outer tube 301, the front end of the inner tube 302 is in threaded connection with the rear end of the handheld straight rod part 2, the rear end of the inner tube 302 is slidably sleeved inside the outer tube 301, the rear end of the inner tube 302 is provided with the inner locking structure 303, the inner tube 302 and the outer tube 301 are locked through the inner locking structure 303, and the rear end of the outer tube 301 is rotatably connected with the drag hook body 5. Thereby increase the overall length of outer tube 301 and inner tube 302 through stretching out inner tube 302, the distance of extension drag hook body 5 and handheld straight rod portion 2 makes operator's hand keep away from the incision position to avoid sheltering from the operation field of vision.

The interlock structure 303 includes a tapered bolt 3031, an expansion sleeve 3032, and an anti-slip head 3033. An anti-drop head 3033 is fixedly arranged on a first end face of the conical bolt 3031, a second end face of the conical bolt 3031 is fixedly connected with the rear end of the inner tube 302, the diameter of the first end face of the conical bolt 3031 is smaller than that of the second end face of the conical bolt 3031, and the conical bolt 3031 and the inner tube 302 rotate synchronously. The expansion sleeve 3032 is sleeved outside the taper bolt 3031, and the expansion sleeve 3032 is in threaded connection with the taper bolt 3031.

The expansion sleeve 3032 is provided with an opening 12 along the axial direction, the section of the expansion sleeve 3032 is C-shaped, the opening 12 of the expansion sleeve 3032 can be opened, and the expansion sleeve 3032 is sleeved on the taper bolt 3031. The expansion sleeve 3032 is vertically and slidably arranged on the inner wall of the outer pipe 301, and the expansion sleeve 3032 is connected with the outer pipe 301 through the spline 11, so that the expansion sleeve 3032 can only slide up and down in the outer pipe 301 and cannot rotate. When the inner pipe 302 and the taper bolt 3031 are rotated, the expansion sleeve 3032 is not changed in position, the taper bolt 3031 moves up and down in the expansion sleeve 3032 due to the threaded relation, and the expansion sleeve 3032 is always attached to the taper bolt 3031.

As shown in fig. 9, in the initial state, the expansion sleeve 3032 is located at the end of the taper bolt 3031 with a smaller diameter, and at this time, the overall outer diameter is smaller than the inner diameter of the outer pipe 301, so that the inner pipe 302 can slide freely in the outer pipe 301; as shown in fig. 10, when the inner tube 302 is positioned and the inner tube 302 and the outer tube 301 need to be locked, the inner tube 302 is rotated counterclockwise to move the taper bolt 3031 from the end with the smaller diameter to the end with the larger diameter. At this point, which constitutes a total outer diameter close to the inner diameter of the outer tube 301, the expansion sleeve 3032 is expanded and squeezed between the outer tube 301 and the taper bolt 3031, so that the inner tube 302 is locked in the outer tube 301 and the inner tube 302 can no longer slide; similarly, when unlocking is required, the inner tube 302 is rotated clockwise, so that the taper bolt 3031 is rotated and moved from the end with the larger diameter to the end with the smaller diameter. The anti-falling head 3033 is pressed against the expansion sleeve 3032 to prevent the expansion sleeve 3032 from falling off the taper bolt 3031. At this time, it is configured to have an overall outer diameter smaller than the inner diameter of the outer tube 301, and the inner tube 302 can be arbitrarily slid inside the outer tube 301.

The rear end of the telescopic rod component 3 is rotatably connected with the drag hook body 5 through the rotating adjusting structure 4, and an included angle is formed between the drag hook body 5 and the telescopic rod component 3. Patient's incision direction diverse adjusts the contained angle between drag hook body 5 and the telescopic link subassembly 3 through rotating regulation structure 4, makes drag hook body 5 more laminate patient's incision direction, avoids drag hook body 5 to occupy too much operation lacuna to expose more operation fields of vision, do benefit to the completion of excision operation.

The rotation adjustment structure 4 includes a key 401, a ratchet 402, a pawl 403, and an active disk 404. The retractor body 5 rotates on the telescopic rod assembly 3 by pressing the button 401. When adjusting the angle of the drag hook body 5, the hand press button 401 is used for adjustment, and when the button 401 is pressed, the connection relation between the drag hook body 5 and the telescopic rod component 3 is released, and the drag hook body 5 can freely rotate on the telescopic rod component 3. Accordingly, the hook body 5 is locked on the telescopic rod component 3 after the hand is released. A pawl 403 is hinged to the outer tube 301, the pawl 403 being pivotable by an external force to engage with ratchet teeth on the ratchet wheel 402 or to abut against the movable disc 404. The button 401 is externally sleeved with a ratchet wheel 402 and a movable disc 404, the movable disc 404 covers part of the ratchet wheel 402, the ratchet wheel 402 and the movable disc 404 are arranged between the telescopic rod assembly 3 and the retractor body 5, the rotating circle center of the ratchet wheel 402 is fixedly arranged on the retractor body 5, and the ratchet wheel 402 and the retractor body 5 synchronously rotate around the shaft center. Rotation of the retractor body 5 is rotation of the ratchet 402. An arc-shaped open slot 6 is formed in the arc-shaped edge of the movable disc 404, a protruding stop point 7 is arranged on the covered side edge of the ratchet wheel 402, the protruding stop point 7 moves in the arc-shaped open slot 6, and the movement of the protruding stop point 7 is the rotation of the ratchet wheel 402.

As shown in fig. 4, in the initial state, the retractor body 5 is vertically disposed on the outer tube 301, and the position relationship of each component of the rotation adjusting structure 4 is: the raised catch point 7 is located at the left end of the arcuate slot 6 and the moveable disc 404 overlies most of the ratchet wheel 402, the pawl 403 bearing against the part of the ratchet wheel 402 that is free of ratchet teeth.

The following operations of rotating the hook body 5 by an angle are all performed when the key 401 is pressed.

As shown in FIGS. 5-6, when the retractor body 5 is pushed clockwise toward the outer tube 301, the ratchet wheel 402 and the retractor body 5 rotate clockwise synchronously, the movable plate 404 is stationary, the raised stop 7 moves from left to right in the arcuate slot 6, most of the ratchet wheel 402 and the teeth thereon are exposed, and the pawl 403 engages with the exposed teeth. Because of the engagement of the pawl 403 with the ratchet teeth, the ratchet 402 can only rotate clockwise, but not counterclockwise. Correspondingly, the draw hook main body can only rotate clockwise and can not rotate anticlockwise, so that the angle of the draw hook main body can be adjusted and determined. The angle change of the draw hook main body is avoided when the hook part of the draw hook main body is subjected to anticlockwise acting force. Until the convex stopping point 7 is clamped at the right end of the arc-shaped open slot 6. The retractor body 5 is continuously pushed clockwise to approach the outer tube 301, the ratchet 402 and the retractor body 5 synchronously rotate clockwise, and at the moment, the ratchet 402 drives the movable disc 404 to rotate clockwise until the pawl 403 abuts against the movable disc 404. The ratchet 402 is no longer engaged with the pawl 403 and so the operation of adjusting the angle of the retractor body is complete. And at this point the retractor body is almost parallel to the outer tube 301.

As shown in fig. 7 to 8, the retractor body 5 is rotated counterclockwise to restore the original shape, the retractor body 5 is pushed counterclockwise to move away from the outer tube 301, the ratchet 402 and the retractor body 5 rotate counterclockwise synchronously, the movable plate 404 is stationary, and at this time, the pawl 403 always abuts against the movable plate 404. The convex stop point 7 moves from right to left in the arc-shaped slot 6 until the convex stop point 7 is clamped at the left end of the arc-shaped slot 6, and most of the ratchet wheel 402 is hidden behind the movable disc 404. The retractor body 5 is continuously pushed counterclockwise to be far away from the outer tube 301, the ratchet wheel 402 and the retractor body 5 synchronously rotate counterclockwise, and at the moment, the ratchet wheel 402 drives the movable disc 404 to rotate counterclockwise. When the pawl 403 no longer abuts against the movable plate 404, the ratchet teeth on the ratchet 402 have rotated past the detent position of the pawl 403, so that the hook body can be freely restored to its original shape.

The utility model discloses use as follows:

the length of the telescopic rod component 3 is adjusted according to the position of the incision of the patient, the inner tube 302 is extended out of the outer tube 301, and after the length is determined, the inner tube 302 is rotated to lock the inner locking structure 303 on the inner tube with the outer tube 301. According to the direction of the incision of the patient, the key 401 is pressed, the drag hook body 5 is rotated clockwise, and the angle of the drag hook body 5 is adjusted and determined. After having adjusted telescopic link assembly 3's length and drag hook body 5's angle, medical personnel are handheld to be handed hook portion 1 and handheld straight rod portion 2, stretch into patient's incision with the drag hook main part in, all the other parts stay outside patient's wound, and the crotch department of drag hook main part supports at patient's incision edge, and medical personnel outwards pull this device, and the incision struts to fully expose the fistula.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. The utility model provides a drag hook that uses in the first branchial fistula excision of II type, a serial communication port, including handheld hook portion (1), handheld straight rod portion (2), telescopic link subassembly (3), rotation regulation structure (4) and drag hook body (5), the front end of handheld straight rod portion (2) is equipped with handheld hook portion (1), just handheld hook portion (1) with handheld straight rod portion (2) integrated into one piece, the rear end of handheld straight rod portion (2) with the connection can be dismantled to the front end of telescopic link subassembly (3), the rear end of telescopic link subassembly (3) with drag hook body (5) pass through rotation regulation structure (4) rotate the connection, just drag hook body (5) with the contained angle has between telescopic link subassembly (3).

2. A retractor for use in type II primary branchiotomy, according to claim 1, wherein the rotation adjustment structure (4) comprises a button (401), a ratchet (402), a pawl (403) and a movable disk (404), the retractor body (5) rotates on the telescopic rod assembly (3) by pressing the button (401), the ratchet (402) and the movable disk (404) are sleeved outside the button (401), the movable disk (404) covers part of the ratchet (402), the ratchet (402) and the movable disk (404) are arranged between the telescopic rod assembly (3) and the retractor body (5), the rotation center of the ratchet (402) is fixed on the retractor body (5), the ratchet (402) and the retractor body (5) rotate synchronously around the axis, and the pawl (403) is hinged on the telescopic rod assembly (3), and the pawl (403) engages with or bears against a ratchet tooth on the ratchet wheel (402) on the movable disc (404).

3. A retractor for use in type II primary fistulotomy according to claim 2 wherein the movable plate (404) is provided with an arcuate slot (6) in its arcuate edge, the ratchet wheel (402) is provided with a raised abutment (7) on the covered side, and the raised abutment (7) is movable within the arcuate slot (6).

4. A retractor for use in type II primary branchiotomy, according to claim 1, wherein the telescopic rod assembly (3) comprises an outer tube (301), an inner tube (302) and an inner locking structure (303), the diameter of the inner tube (302) is smaller than that of the outer tube (301), the front end of the inner tube (302) is screwed with the rear end of the handheld straight rod part (2), the rear end of the inner tube (302) is slidably sleeved inside the outer tube (301), the rear end of the inner tube (302) is provided with the inner locking structure (303), the inner tube (302) and the outer tube (301) are locked by the inner locking structure (303), and the rear end of the outer tube (301) is rotatably connected with the retractor body (5).

5. A retractor for use in type II first gill-splitting fistula resection according to claim 4, characterized in that the internal locking structure (303) comprises a taper bolt (3031), an expansion sleeve (3032) and an anti-drop head (3033), wherein the anti-drop head (3033) is fixedly arranged on the first end surface of the taper bolt (3031), the second end surface of the taper bolt (3031) is fixedly connected with the rear end of the inner tube (302), the diameter of the first end surface of the taper bolt (3031) is smaller than that of the second end surface thereof, the expansion sleeve (3032) is sleeved outside the taper bolt (3031), and the expansion sleeve (3032) is in threaded connection with the taper bolt (3031).

6. A retractor for use in type II primary gill splitting fistulectomy according to claim 5, characterized in that the expansion sleeve (3032) is vertically slid onto the inner wall of the outer tube (301), and the expansion sleeve (3032) is coupled to the outer tube (301) by means of a spline (11).

7. A retractor for use in type II primary fistulotomy according to claim 5 wherein the expansion shell (3032) is provided with an opening (12) in the axial direction and the expansion shell (3032) is C-shaped in cross-section.

8. A retractor for use in type II primary fistulectomy according to claim 1, further comprising a first cushion (8), wherein the hand-held hook portion (1) is provided with the first cushion (8) around the outside.

9. A retractor for use in type II primary fistulectomy according to claim 1 further comprising a second padded sleeve (9), wherein the second padded sleeve (9) is provided around the retractor body (5).

10. A retractor for use in type II primary fistulotomy according to claim 1 wherein the hand-held straight shaft portion (2) is provided with anti-slip threads (10).

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