Dimension-controllable free soft tissue acquisition device

Abstract

The invention discloses a cun-controllable free soft tissue cutting device. A knife rest is fixed to the end of a handle, the two ends of a sliding rail are fixed to the knife rest, sliding blocks are assembled on the sliding rail in a sliding mode, a clamp is fixed to each sliding block, a blade is fixed to each clamp, and the two blades are arranged in parallel; the cutting edge of the blade is in a double-slope arc shape, a through hole is formed in the blade face at the blade point of the blade, the bottom of the through hole extends towards the blade ridge to form an opening, the outer side face of the blade extends towards the blade root along the through hole to be provided with a blade face groove, and a clamp groove and a sliding block groove are formed in the positions, aligned with the blade face groove, of the clamp and the sliding block. The two ends of the metal wire are installed on the tool faces of the two blades through the openings, the blades and the metal wire form a U-shaped cutting structure, and the two ends of the metal wire extend upwards through the penetrating holes, the tool face grooves, the clamp grooves and the sliding block grooves correspondingly to penetrate out of the upper portion of the sliding block and are merged into the BOA unit fixed to the top of the sliding rail. The device can be used for cutting free soft tissues with uniform thickness and accurately controllable length and width.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oral surgery instruments, in particular to a size-controllable free soft tissue obtaining device. BACKGROUND

[0002] Free soft tissue transplantation is a common method for treating gingival recession and increasing keratinized gingival width, but there are many technical bottlenecks in obtaining the graft during the operation. The maxillary palate (especially the posterior palate area) has a complex anatomical morphology, and in patients with high and steep vault or thin mucosa, surgical instruments are difficult to fully stretch, which easily causes insufficient graft size or edge tearing.

[0003] Traditional instruments (such as surgical knives) cannot accurately control the cutting depth, and too shallow causes insufficient graft thickness, and too deep damages the branches of the greater palatine artery, causing bleeding or postoperative pain. Depending on the experience of the operator, the free process is easy to cause graft perforation or delamination failure (separation of epithelium and connective tissue) due to uneven force.

[0004] The graft thickness consistency obtained by the traditional method is poor, and too thin is easy to necrosis, and too thick is delayed by the blood supply reconstruction of the area. Manual cutting depending on the experience of the operator is difficult to ensure the uniformity of the tissue thickness, and it is easy to appear perforation or over-thickness, and the width of the soft tissue needs to be controlled by the operator visually. Therefore, the current clinical problems of obtaining free soft tissue are: (1) poor surgical field and high operation difficulty; (2) it is difficult to ensure the appropriate width, length and thickness of the graft depending on the experience of the operator, the graft thickness is not uniform, and the treatment effect is affected; (3) high technical sensitivity, long operation time, high requirement for doctors, and strong postoperative discomfort of patients.

[0005] Therefore, a device that is simple to operate, can obtain uniform thickness, and can control the width and length of the free soft tissue is needed. SUMMARY

[0006] The purpose of the present application is to solve the problems of the traditional surgical knife, such as uneven cutting thickness, difficulty in accurately controlling the length and width, etc., in the operation of obtaining soft tissue of a specific size (length, width, thickness), and to provide a size-controllable free soft tissue cutting device.

[0007] The technical scheme adopted by the present application to achieve the purpose is:

[0008] A size-controllable free soft tissue cutting device, comprising a handle, a knife holder, a sliding rail, a sliding block, a clamp, a blade, a metal wire and a BOA unit, wherein:

[0009] The knife holder is fixed to the end of the handle, the two ends of the slide rail are fixed to the knife holder, two slide blocks are slidingly assembled on the slide rail, the position of each slide block on the slide rail is fixed by a positioning screw, a clamp is fixed on each slide block, each clamp is fixed with a blade, and the two blades are arranged in parallel.

[0010] The cutting edge of the blade is a double-bevel arc shape, a through hole is arranged on the blade surface at the blade tip, the bottom of the through hole extends to the blade ridge to form an opening, and a blade surface groove is arranged on the outer side of the blade and extends to the blade root along the through hole.

[0011] The two ends of the metal wire are installed on the blade surfaces of the two blades through the opening, and the blade and the metal wire form a U-shaped cutting structure, the two ends of the metal wire extend upward to above the slide block through the through hole, the blade surface groove, the clamp groove and the slide block groove, and are integrated into a BOA unit fixed to the top of the slide rail.

[0012] In the above technical solution, the blade ridge is straight and provided with a scale value.

[0013] In the above technical solution, the clamp comprises an outer block and an inner block fastened by a fixing screw, the top of the outer block is fixed with the slide block, the inner surface of the outer block is in contact with the outer surface of the blade, and the working length of the blade is controlled by adjusting the clamping length of the blade in the clamp.

[0014] In the above technical solution, the inner surfaces of the outer block and the inner block are provided with female grooves matched with the width of the blade.

[0015] In the above technical solution, the slide rail is provided with a scale value, the two ends of the slide rail are fixed with curved knife holders, and the two curved knife holders are fixed to the end of the handle.

[0016] In the above technical solution, the handle is provided with two rotary joints.

[0017] In the above technical solution, the metal wire is a nickel-titanium alloy wire with a diameter of 0.1-0.3 mm, a 316L stainless steel wire with a diameter of 0.1-0.3 mm or a tungsten wire with a diameter of 0.1-0.3 mm.

[0018] In the above technical solution, the material of the blade is high-carbon stainless steel, ceramic or carbon steel.

[0019] In the above technical solution, the surface of the blade is coated with a PTFE coating.

[0020] In the above technical solution, an elastic buffer structure is arranged at the bifurcated connection of the knife holder.

[0021] Compared with the prior art, the present application has the advantages of:

[0022] The device of the present application can cut soft tissues with uneven thickness, and the length and width of which can be accurately controlled. The device is simple in structure, easy to operate, and does not depend on the experience of doctors, and is convenient for popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a front view of the cutting device of the present application.

[0024] Figure 2 Fig. 2 is a side view of the cutting device of the present application.

[0025] Figure 3 Fig. 3 is a top view of the cutting device of the present application.

[0026] Figure 4 Fig. 4 is a schematic view of the structure of the blade.

[0027] In the figure: 1-handle, 2-blade holder, 3-sliding rail, 4-sliding block, 5-clamp, 6-blade, 7-wire, 8-BOA unit, 9-perforation, 10-opening, 11-blade surface groove, 12-clamp groove, 13-sliding block groove, 14-fixing screw, 15-rotary joint, 16-positioning screw;

[0028] 5-1-outer block, 5-2-inner block;

[0029] 6-1-blade edge, 6-2-blade ridge, 6-3-blade root; DETAILED DESCRIPTION

[0030] The present application will be further described in detail below in combination with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0031] Example 1

[0032] As shown in Fig. 1, a size-controllable free soft tissue cutting device includes a handle 1, a blade holder 2, a sliding rail 3, a sliding block 4, a clamp 5, a blade 6, a wire 7, and a BOA unit 8, wherein: Figures 1-4 The blade holder 2 is fixed to the end of the handle 1, the two ends of the sliding rail 3 are fixed to the blade holder 2, two sliding blocks 4 are slidingly assembled on the sliding rail 3, the position of each sliding block 4 on the sliding rail 3 is fixed by a positioning screw 16, one clamp 5 is fixed on each sliding block 4, one blade 6 is fixed on each clamp 5, and the two blades 6 are arranged in parallel;

[0033]

[0034] ​The blade 6 has a double bevel arc-shaped cutting edge 6-1 (which can balance sharpness and reduce tissue damage, and is superior to the single bevel of traditional peeling knives), and a hole 9 is provided on the blade surface at the tip of the blade 6, which is preferably an oval hole, the bottom of the hole 9 extends to the blade ridge 6-2 to form an opening 10, the outer side of the blade 6 extends along the hole 9 to the blade root 6-3 to form a blade surface groove 11, the clamp 5 and the slider 4 are provided with a clamp groove 12 and a slider groove 13 at positions aligned with the blade surface groove 11.

[0035] The two ends of the wire 7 are installed on the blade surfaces of the two blades 6 through the opening 10, and the blade 6 and the wire 7 form a U-shaped cutting structure, the two ends of the wire 7 extend upward through the hole 9, the blade surface groove 11, the clamp groove 12, and the slider groove 13 to above the slider 4, and are integrated into the BOA unit 8 fixed on the top of the sliding rail 3.

[0036] The tension of the wire 7 can be adjusted by rotating the BOA unit 8. After adjusting the position of the blade 6 and fixing it with the clamp 5, tightening the BOA unit 8 can tighten the wire 7, the rotating nut of the BOA unit 8 can be in a screw mode, and the tension of the wire 7 can be precisely controlled by rotating with a dental implant repair wrench to meet the cutting requirements. When the blade 6 needs to be replaced, the BOA unit 8 is rotated in the opposite direction to make the wire 7 loose, and then the blade 6 can be replaced after the wire 7 is removed from the opening 10.

[0037] As a preferred embodiment, the blade ridge 6-2 is straight and has a scale value.

[0038] As a preferred embodiment, the blade root 6-3 is clamped and fixed by the clamp 5. The clamp 5 includes an outer block 5-1 and an inner block 5-2 fastened by a fixing screw 14, wherein the top of the outer block 5-1 is fixed with the slider 4, the inner surface of the outer block 5-1 is in contact with the outer surface of the blade 6 to fix it, and the working length of the blade 6 is controlled by adjusting the clamping length of the blade 6 in the clamp 5. The inner surfaces of the outer block 5-1 and the inner block 5-2 are provided with female grooves matching the width of the blade 6, so that the blade 6 can only move vertically on the clamp 5, ensuring that the two blades 5 are parallel to each other and perpendicular to the soft tissue surface to be cut. The lower surface of the clamp 5 extends outward to act as a stop, and the upward bending is beneficial for smoother movement on the soft tissue surface during soft tissue cutting.

[0039] As preferred, the slide rail 3 is provided with scale values, and the slider 4 drives the clamp 5 and the blade 6 to move horizontally when moving on the slide rail 3, so as to adjust the distance between the two blades 6 (i.e. the width of the soft tissue to be cut), and then fixed by the positioning screw 16 on the slider 4 after adjusting to the appropriate width. The BOA unit 8 is fixed in the center of the slide rail 3, and the metal wire 7 is inserted through the two sliders 4. The two curved holders 2 are fixed at the ends of the handle 1.

[0040] As preferred, the holder 2 has physiological curvature during the extension and convergence process, so that the curvature of the holder 2 fits the palate when the device is working. The handle 1 is provided with two rotary joints 15, and the angle of the handle 1, the holder 2 and the working surface is adjusted by adjusting the angle of the two rotary joints 15, so as to meet the demand of oral operation space.

[0041] When the device is cutting, the blade 6 is cut into the soft tissue surface vertically, and the clamp 5 stops when the bottom surface of the clamp 5 abuts against the soft tissue surface, so as to reach the cutting depth. The clamp 5 is tightly attached to the soft tissue by holding the handle 1, and then the blade 6 is pulled outwards to cut the soft tissue to the required length, and the metal wire 7 is disconnected.

[0042] As preferred, the metal wire 7 is made of super-elastic nickel-titanium alloy wire (diameter 0.1-0.3mm), 316L stainless steel wire (0.1-0.3mm) or tungsten wire (0.1-0.3mm).

[0043] As preferred, the material of the blade 6 is high-carbon stainless steel (such as 420J2 or 440C), ceramic or carbon steel, or added with PTFE (polytetrafluoroethylene) coating to reduce tissue adhesion.

[0044] As preferred, the bifurcated connection of the holder 2 can be provided with elastic buffer structure (such as silica gel pad) to avoid shaking caused by the resistance of the gum tissue during operation.

[0045] As preferred, the tail of the handle 1 is provided with finger ring fixing structure to prevent the instrument from slipping off during operation.

[0046] As preferred, the force of the BOA unit 8 can be designed to match the screws of common implant brands such as Straumann, Nobel, Astra, etc., so as to tighten the force to adjust the tension of the metal wire 7.

[0047] Example 2

[0048] The free soft tissue cutting device described in Example 1 is used to obtain epithelial free gingiva, which includes the following steps:

[0049] Adjust the length of the blade 6 in the clamp 5, so that the working length is adjusted to 2mm, that is, the length of the wire 7 to the bottom surface of the clamp 5 is 2mm. Adjust the position of the sliding block 4 on the sliding rail 3 to adjust the distance between the blades 6, which is generally 5-10mm, and the maximum is not more than 15mm, and the distance (for example, 8mm) is determined according to the operation requirement, that is, the width of the soft tissue to be obtained. After the width is determined, the sliding block clamp 4 is fixed on the sliding rail 3 by the positioning screw 16. The tension of the wire 7 is adjusted to 2-5N by using a force wrench or a machine screwdriver, and the rotating joint 15 of the handle 1 is adjusted to make the device shape more suitable for the donor area according to the shape of the maxillary palatal dome of the patient, so as to ensure that the blade 6 is perpendicular to the surface of the hard palate as much as possible.

[0050] Hold the handle 1 to position the device in the patient's mouth, so that the blade 6 is perpendicular to the surface of the hard palate, and the range of soft tissue to be obtained is controlled within the safety range of 3mm from the gum margin and 5mm from the palatine artery. Hold the handle 1 to cut the soft tissue of the hard palate vertically, and the cutting depth is 2mm, and the bottom surface of the sliding block clamp 5 serves as a stop. After reaching the cutting depth, hold the handle 1 to cut from back to front, and the U-shaped cutting structure composed of the blade 6 and the wire 7 can prepare the soft tissue graft with a depth of 2mm and a width meeting the requirement. After cutting to the required length (for example, 15mm), the graft is disconnected using the wire 7, and the preparation process is completed, that is, a free gingival graft with a length of 15mm, a width of 8mm and a thickness of 2mm is obtained.

[0051] Example 3

[0052] The free soft tissue cutting device described in Example 1 is used to prepare an epithelium-free connective tissue graft, including the following steps:

[0053] Adjust the length of the blade 6 in the clamp 5, so that the working length is adjusted to 0.5mm, and the working width (for example, 8mm), the tension of the wire 7 and the angle of the rotating joint 15 are adjusted as in the process of Example 2. Cut into the soft tissue and cut horizontally to the required length longer by 2mm (for example, 17mm), and at this time, the 0.5mm thick surface epithelium is not disconnected, and the U-shaped cutting structure is withdrawn to the cutting point and taken out.

[0054] Adjust the length of the blade 6 in the clamp 5, so that the working length is adjusted to 2mm, and then cut into the soft tissue of the hard palate in situ to a depth of 2mm, and cut along the original cutting track to the required length (15mm). The epithelium-free connective tissue under the epithelium is disconnected using the wire 7, and a uniform epithelium-free free connective tissue graft with a length of 15mm, a width of 8mm and a thickness of 1.5mm is obtained.

[0055] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A size-controllable free soft tissue harvesting device, characterized in that, Includes handle, tool holder, slide rail, slider, clamp, blade, wire, and BOA unit, among which: The blade holder is fixed to the end of the handle, the two ends of the slide rail are fixed to the blade holder, two sliders are slidably assembled on the slide rail, the position of each slider on the slide rail is fixed by a positioning screw, a clamp is fixed on each slider, each clamp is fixed with a blade, and the two blades are arranged in parallel. The blade has a double-beveled arc shape. A through hole is provided on the blade surface at the tip of the blade. The bottom of the through hole extends towards the blade ridge to form an opening. A blade surface groove is provided on the outer side of the blade along the through hole towards the blade root. A clamping groove and a slider groove are provided at positions that are aligned with the blade surface groove. The two ends of the metal wire are installed on the cutting surfaces of the two blades through the opening. The blades and the metal wire form a U-shaped cutting structure. The two ends of the metal wire extend upward through the through hole, the cutting surface groove, the clamp groove and the slider groove to pass above the slider and are incorporated into the BOA unit fixed to the top of the slide rail.

2. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The blade edge is straight and has graduated values.

3. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The clamp includes an outer block and an inner block fastened by fixing screws. The top of the outer block is fixed to the slider, and the inner surface of the outer block is fixed in contact with the outer surface of the blade. The working length of the blade is controlled by adjusting the clamping length of the blade in the clamp.

4. The size-controllable free soft tissue harvesting device as described in claim 3, characterized in that, The inner surfaces of the outer and inner blocks are provided with grooves that match the width of the blade.

5. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The slide rail is provided with scale values, and curved tool holders are fixed at both ends of the slide rail. The two tool holders are bent and joined together and fixed to the end of the handle.

6. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The handle is equipped with two rotary joints.

7. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The metal wire is a nickel-titanium alloy wire with a diameter of 0.1-0.3 mm, a 316L stainless steel wire with a diameter of 0.1-0.3 mm, or a tungsten wire with a diameter of 0.1-0.3 mm.

8. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The blade is made of high-carbon stainless steel, ceramic, or carbon steel.

9. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The surface of the blade is coated with a PTFE coating.

10. The size-controllable free soft tissue harvesting device as described in claim 1, characterized in that, The forked connection of the tool holder is provided with an elastic buffer structure.

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