Patent Description:
During the root canal therapy, densely three-dimensional filling shall be performed for the root canal to be cleaned and preformed to eliminate dead space and prevent external bacteria and pollutants from being infiltrated, thereby preventing the root canal system from being reinfected. Among modern root canal filling techniques, the gutta-percha point is the most widely used and mainstream root canal filling material. Before filling, it is necessary to select an appropriate gutta-percha point according to working length of the patient's root canal and the dimensions of prepared root canal, and then trim it to cut off unnecessary parts.

During the root canal filling, an ideal filling stop shall be the same as the prepared stop of the root canal, which is generally located at physiological apical foramen or the narrowest part of the root apex. In case of over-filling or under-filling, the effect of the root canal therapy will be affected. In case of over-filling, bacteria and other infectious substances will be pushed into the apical foramen, causing the periapical periodontitis. In addition, the root canal filling material can cause foreign body reaction or toxic irritation in the periapical tissue. In case of under-filling, periapical tissue fluid and exudate will return to the unfilled root canal, and the decomposition and reproduction of the exudate lead to re-infection and failure of root canal therapy. Therefore, it is very important to determine length and taper of the gutta-percha point before the root canal filling.

At present, there are many types of trimming tools of the gutta-percha point, involving various structural types, such as push-in type, press type, rotation type, etc., but the using effects are not satisfactory, resulting in a poor user experience.

For example, <CIT> discloses a gutta-percha point trimmer, comprising a base and a sliding block element, wherein the base is provided with at least one guide rail and the locating holes of various specifications passing through the base, the sliding block element comprises a sliding block and blades, the sliding block is in clearance fit with the base, the sliding block slides along the base, the sliding block is provided with a counterbore and at least one sliding chute, the sliding chute is in clearance fit with the guide rail, and each of the blades is fixedly connected to the sliding block.

<CIT> provides a dental device for measuring a root canal filler. The gutta-percha point trimmer described in the independent claim introduces several innovations compared to the device in <CIT>. It features a unique guide rail and locating holes of various specifications for precise trimming of gutta-percha points, essential for root canal treatments. Unlike the original device's focus on manual adjustment and cutting with potential safety concerns, this invention utilizes a sliding block element with blades, enhancing precision and safety. This design allows for the accurate adjustment of gutta-percha points to specific sizes, addressing the efficiency and precision shortcomings of the prior art. The novel mechanism ensures safer operation, minimizing blade exposure, and simplifies the process of preparing gutta-percha points, thus improving treatment efficiency. These improvements solve key issues of inefficiency, lack of precision, and safety in the existing technology, marking a significant advancement in dental treatment tools.

The purpose of the present invention is to provide a gutta-percha point trimmer, which aims to solve the technical problems of unsatisfactory using effect and poor user experience of the gutta-percha point trimmer in the prior art.

In order to achieve the above-mentioned purpose, a gutta-percha point trimmer used in the present invention comprises a base, a sliding block element and a stop block, wherein the base is provided with at least one guide rail, and the locating holes of various specifications passing through each of the guide rails and the base, the sliding block element comprises a sliding block and blades, the sliding block is in clearance fit with the base, the sliding block slides along the base, the sliding block is provided with a counterbore and at least one sliding chute, the sliding chute is in clearance fit with the guide rail, the number of the blades is at least two, each of the blades is fixedly connected to the sliding block, and is located inside each of the sliding chutes, each of the sliding chutes is provided with two blades arranged symmetrically along the length extension direction of the guide rail, the stop block is fixedly connected to the base, and is located at both ends of the length extension direction of the base.

Wherein, each of the said locating holes is provided with a guide chamber and a measuring chamber, wherein the guide chamber is a cylindrical chamber, and the measuring chamber is a tapered chamber.

Wherein, each of the said blades is made of stainless steel, with a thickness of <NUM>~<NUM>.

Wherein, the said sliding block is provided with an X-shaped chute, each of the said blades is fixedly connected to the chute, the side of the cutting edge of each of the blades fits closer to the horizontal plane of the guide rail, and forms an intersection angle of <NUM>° with the horizontal plane of the guide rail.

Wherein, one end of the said sliding block far away from the guide rail is arranged in a concave arc structure.

Wherein, the said sliding block element comprises an elastic element and a resisting element, wherein one end of the elastic element is fixedly connected to the sliding block, the other end of the elastic element is fixedly connected to the resisting element, and the elastic element and the resisting element are located inside the counterbore.

Wherein, the outer wall of the said base is provided with the aperture marks and the scale chutes, wherein the aperture marks are located at one side of the locating hole, each of the locating holes corresponds to one aperture mark, and the scale chutes are respectively located at one side of each of the guide rail.

Wherein, the said base is provided with the guide rail, the sliding block is provided with the sliding chute, the sliding chute is obliquely provided with the two blades, the sliding chute is in clearance fit with the guide rail, and the locating holes of various specifications are arranged in a row along the length extension direction of the base.

Wherein, the said base is provided with the guide rail, the sliding block is provided with the sliding chute, the sliding chute is obliquely provided with the two blades, the sliding chute is in clearance fit with the guide rail, the locating holes of various specifications are divided into two sets, the two sets of the locating holes are respectively arranged at both ends of the base, the two sets of the locating holes are arranged in a row along the length extension direction of the base, and a clearance is reserved between the two sets of the locating holes.

Wherein, the said base is provided with the two guide rails, the sliding block is provided with the two sliding chutes, each of the sliding chutes is obliquely provided with the two blades, each of the sliding chutes is in clearance fit with corresponding each of the guide rails, the locating holes of various specifications are divided into two sets, the two sets of the locating holes are arranged side by side along the width extension direction of the base.

The beneficial effect of a gutta-percha point trimmer of the present invention is embodied in the following: Dentist selects a gutta-percha point to be trimmed, determines dimensions of section to be trimmed, rotates the gutta-percha point into the locating hole of corresponding specification, and then pushes a sliding block by hands. The sliding block slides on the base. The blades cut off the excess part of the gutta-percha point, and trim the gutta-percha point to the required dimensions. The gutta-percha point trimmer is characterized by simple operation and high efficiency. The locating holes of various specifications can guarantee accurate dimensions of cutting section of the gutta-percha point. Moreover, the blades are symmetrically arranged in the sliding chute. On the one hand, the blades can cut in both directions along the base at will. On the other hand, the unexposed cutting edges of the blades are safer and more reliable; moreover, the plane of the guide rail <NUM> protrudes from that of the base <NUM> to achieve separate height increase; the gutta-percha point is cut on the guide rail, which can reduce unnecessary contact area of the blades upon cutting, and can make the blades fit closer on the guide rail, thereby improving the using effect of the gutta-percha point trimmer with the better user experience.

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar mark number indicates the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are merely exemplary, and are intended to explain the present invention, but shall not be construed as limiting the present invention.

In the description of the present invention, it shall be understood that direction or location relations indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on direction or location relations shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that device or element shall have a specific direction, and be constructed and operated in a specific direction, and therefore shall not be construed as limiting the present invention. In addition, in the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

Please refer to <FIG>, <FIG>, <FIG>, <FIG> and <FIG>. The present invention provides a gutta-percha point trimmer <NUM>, comprising a base <NUM>, a sliding block element <NUM> and a stop block <NUM>, wherein the base <NUM> is provided with at least one guide rail <NUM> and the locating holes <NUM> of various specifications passing through each of the guide rails <NUM> and the base <NUM>, the sliding block element <NUM> comprises a sliding block <NUM> and blades <NUM>, the sliding block <NUM> is in clearance fit with the base <NUM>, the sliding block <NUM> slides along the base <NUM>, the sliding block <NUM> is provided with a counterbore <NUM> and at least one sliding chute <NUM>, the sliding chute <NUM> is in clearance fit with the guide rail <NUM>, the number of the blades <NUM> is at least two, each of the blades <NUM> is fixedly connected to the sliding block <NUM>, and is located inside each of the sliding chutes <NUM>, each of the sliding chutes <NUM> is provided with two blades <NUM>, each of the sliding chutes is provided with two blades, the two blades <NUM> are symmetrically arranged along the length extension direction of the guide rail <NUM>, the stop block <NUM> is fixedly connected to the base <NUM>, and is located at both ends of the length extension direction of the base <NUM>.

Further, each of the said locating holes <NUM> is provided with the guide chamber <NUM> and the measuring chamber <NUM>, wherein the guide chamber <NUM> is a cylindrical chamber, and the measuring chamber <NUM> is a tapered chamber.

Further, each of the said blades <NUM> is made of stainless steel, with a thickness of <NUM>~<NUM>.

Further, the said sliding block <NUM> is provided with an X-shaped chute <NUM>, each of the blades <NUM> is fixedly connected to the chute <NUM>, and the side of the cutting edge of each of the blades <NUM> fits closer to the horizontal plane of the guide rail <NUM>, and forms an intersection angle of <NUM>° with the horizontal plane of the guide rail <NUM>.

Further, one end of the said sliding block <NUM> far away from the guide rail <NUM> is arranged in a concave arc structure.

Further, the said sliding block element <NUM> comprises an elastic element <NUM> and a resisting element <NUM>, wherein one end of the elastic element <NUM> is fixedly connected to the sliding block <NUM>, the other end of the elastic element <NUM> is fixedly connected to the resisting element <NUM>, and the elastic element <NUM> and the resisting element <NUM> are located inside the counterbore <NUM>.

Further, the outer wall of the said base <NUM> is provided with the aperture marks <NUM> and the scale chutes <NUM>, wherein the aperture marks <NUM> are located at one side of the locating hole <NUM>, each of the locating holes <NUM> corresponds to one aperture mark <NUM>, and the scale chutes <NUM> are respectively located at one side of each of the guide rails <NUM>.

Further, the said base <NUM> is provided with the guide rail <NUM>, the sliding block <NUM> is provided with the sliding chute <NUM>, the sliding chute <NUM> is obliquely provided with the two blades <NUM>, the sliding chute <NUM> is in clearance fit with the guide rail <NUM>, and the locating holes <NUM> of various specifications are arranged in a row along the length extension direction of the base <NUM>.

In this implementation mode, the said base <NUM> is provided with the guide rail <NUM>, the sliding block <NUM> is provided with the sliding chute <NUM>, the sliding chute <NUM> is obliquely provided with the two blades <NUM>, the sliding chute <NUM> is in clearance fit with the guide rail <NUM>, and the locating holes <NUM> of various specifications are arranged in a row along the length extension direction of the base <NUM>. Dentist selects a gutta-percha point to be trimmed, determines dimensions of section to be trimmed, and rotates the gutta-percha point into the locating hole <NUM> of corresponding specification, wherein the locating hole <NUM> has <NUM> specifications, "<NUM>" "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>" and "<NUM>", which can basically meet the requirements for trimming the gutta-percha points of all specifications. Medical and nursing staff can visually determine the specification of the locating hole <NUM> by observing the aperture mark <NUM> on the side of the locating hole <NUM>, and then determine whether to insert the gutta-percha point into the locating hole <NUM> of such specification. Each of the locating holes <NUM> is provided with the guide chamber <NUM> and the measuring chamber <NUM>, wherein the guide chamber <NUM> is a cylindrical chamber, and the measuring chamber <NUM> is a tapered chamber. For example: the aperture marks <NUM> are "<NUM>" and "<NUM>", indicating the size of the diameter d of the measuring chamber <NUM> on the bottom surface; in terms of quantity, the aperture mark <NUM> is equal to <NUM> multiplied by the diameter d, namely, "<NUM>" indicates that d is equal to <NUM> and "<NUM>" indicates that d is equal to <NUM>. Due to processing difficulty of most gutta-percha point trimmers on the market, the measuring chamber <NUM> is the thin cylindrical chamber rather than the tapered chamber. However, all the gutta-percha points are tapered. If the measuring chamber <NUM> is a cylindrical chamber, upon trimming by inserting into the measuring chamber <NUM>, actually cut section diameter is smaller than theoretically trimmed section diameter. There exists an inevitable error. The measuring chamber <NUM> of the present invention is machined by a custom-made profiling tool with accurate dimensions and high precision, which can ensure accurate dimensions of cutting section.

After the gutta-percha point is inserted into the said locating hole <NUM> of corresponding specification, the said sliding block <NUM> is pushed by hands, so that the sliding block <NUM> slides on the base <NUM>, the two blades <NUM> arranged symmetrically on the sliding chute <NUM> cut off the excess part of the gutta-percha point, and trim the gutta-percha point to the required dimensions, wherein the blades <NUM>, made of stainless steel blades, have a thickness of <NUM>~<NUM>, and the preferred blades <NUM> have a thickness of <NUM>; the blades <NUM> is extremely sharp, with high hardness and wear resistance. In addition, since the sliding block <NUM> is provided with an X-shaped chute <NUM>, each of the blades <NUM> is fixedly connected to the chute <NUM> by anaerobic adhesive. The anaerobic adhesive can withstand a high temperature of more than <NUM> degrees; therefore, the gutta-percha point trimmer can be sterilized at high temperature. The side of the cutting edge of each of the blades <NUM> fits closer to the horizontal plane of the guide rail <NUM>, and forms an intersection angle of <NUM>° with the horizontal plane of the guide rail <NUM>. The plane of the guide rail <NUM> protrudes from that of the base <NUM> to achieve separate height increase. The gutta-percha point is cut on the guide rail <NUM>, which can reduce unnecessary contact area of the blades <NUM> upon cutting, and can make the blades <NUM> fit closer on the guide rail <NUM>; therefore, the blades <NUM> can cut off (equivalent to shoveling off) the exposed gutta-percha point along the bottom surface of the locating hole <NUM> upon working, and the cutting section is very flat. The blade <NUM> is very thin and sharp; therefore, the gutta-percha point cannot be crushed during cutting, and the cutting section is still round. The two symmetrically-arranged blades <NUM> can cut, no matter which direction the sliding block <NUM> moves towards. Moreover, the unexposed cutting edges of the blades <NUM> are safer and more reliable; the stop block <NUM> is a limit screw, which can limit the movement of the sliding block <NUM> to prevent the sliding block <NUM> from sliding away from the base <NUM>.

By arranging one end of the said sliding block <NUM> far away from the guide rail <NUM> in a concave arc structure, the dentist can feel more comfortable and reliable when pressing and moving the sliding block <NUM>. The elastic element <NUM> is a compressed spring. The resisting element <NUM> is the steel ball. The sliding block <NUM> is in clearance fit with the base <NUM>. Upon designing, a small compressed spring can be used in pretightening with the steel ball. The compressed spring is placed into the counterbore <NUM> on the sliding block <NUM>. The steel ball is placed on the compressed spring. The compression amount of the compressed spring, that is, pretightening force, is determined by the depth of the counterbore <NUM>. After the sliding block <NUM> is installed on the base <NUM>, the compressed spring and the steel ball are confined in the counterbore <NUM> of the sliding block <NUM>, and the steel ball is pressed against the plane of the base <NUM> under the action of the compressed spring. Of course, due to small compression amount of the compressed spring, the pretightening force is very small, which only ensures that the sliding block <NUM> cannot slide freely on the base <NUM>, without affecting smoothness of movement during work. When the length of the gutta-percha point needs to be measured, the gutta-percha point shall be placed inside the scale chute <NUM>. The length of the gutta-percha point can be easily measured through the scale chute <NUM> on the base <NUM>.

The said base <NUM> and the said sliding block <NUM> are made of aluminum alloy material and have been oxidized. The gutta-percha point trimmer <NUM>, solid and durable, can be sterilized at high temperature. Moreover, it is characterized by light weight, multiple colors and handsome appearance. The entire gutta-percha point trimmer, compact and lightweight, can be operated with one hand; therefore, it is simple and convenient in use. Only one person can complete the trimming of the gutta-percha point, which greatly improves work efficiency.

According to the above description, the using effect of the gutta-percha point trimmer <NUM> gets improved, with the better user experience.

Please refer to <FIG>, <FIG>, <FIG>, <FIG> and <FIG>. It provides a gutta-percha point trimmer <NUM>, comprising a base <NUM>, a sliding block element <NUM> and a stop block <NUM>, wherein the base <NUM> is provided with at least one guide rail <NUM> and the locating holes <NUM> of various specifications passing through each of the guide rails <NUM> and the base <NUM>, the sliding block element <NUM> comprises a sliding block <NUM> and blades <NUM>, the sliding block <NUM> is in clearance fit with the base <NUM>, the sliding block <NUM> slides along the base <NUM>, the sliding block <NUM> is provided with a counterbore <NUM> and at least one sliding chute <NUM>, the sliding chute <NUM> is in clearance fit with the guide rail <NUM>, the number of the blades <NUM> is at least two, each of the blades <NUM> is fixedly connected to the sliding block <NUM>, and is located inside each of the sliding chutes <NUM>, each of the sliding chutes <NUM> is provided with two blades <NUM>, each of the sliding chutes is provided with two blades, the two blades <NUM> are symmetrically arranged along the length extension direction of the guide rail <NUM>, the stop block <NUM> is fixedly connected to the base <NUM>, and is located at both ends of the length extension direction of the base <NUM>.

Further, the said base <NUM> is provided with the guide rail <NUM>, the sliding block <NUM> is provided with the sliding chute <NUM>, the sliding chute <NUM> is obliquely provided with the two blades <NUM>, the sliding chute <NUM> is in clearance fit with the guide rail <NUM>, the locating holes <NUM> of various specifications are divided into two sets, the two sets of the locating holes <NUM> are respectively arranged at the both ends of the base <NUM>, the two sets of the locating holes <NUM> are arranged in a row along the length extension direction of the base <NUM>, and a clearance between the two sets of the locating holes <NUM> is reserved.

In this implementation mode, dentist selects a gutta-percha point to be trimmed, determines dimensions of section to be trimmed, rotates the gutta-percha point into the locating hole <NUM> of corresponding specification, wherein the locating hole <NUM> has <NUM> specifications, "<NUM>" "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>" and "<NUM>", which can basically meet the requirements for trimming the gutta-percha points of all specifications. Medical and nursing staff can visually determine the specification of the locating hole <NUM> by observing the aperture mark <NUM> on the side of the locating hole <NUM>, and then determine whether to insert the gutta-percha point into the locating hole <NUM> of such specification. Each of the locating holes <NUM> is provided with the guide chamber <NUM> and the measuring chamber <NUM>, wherein the guide chamber <NUM> is a cylindrical chamber, and the measuring chamber <NUM> is a tapered chamber. For example: the aperture marks <NUM> are "<NUM>" and "<NUM>", indicating the size of the diameter d of the measuring chamber <NUM> on the bottom surface; in terms of quantity, the aperture mark <NUM> is equal to <NUM> multiplied by the diameter d, namely, "<NUM>" indicates that d is equal to <NUM> and "<NUM>" indicates that d is equal to <NUM>. Due to processing difficulty of most gutta-percha point trimmers on the market, the measuring chamber <NUM> is the thin cylindrical chamber rather than the tapered chamber. However, all the gutta-percha points are tapered. If the measuring chamber <NUM> is a cylindrical chamber, upon trimming by inserting into the measuring chamber <NUM>, actually cut section diameter is smaller than theoretically trimmed section diameter. There exists an inevitable error. The measuring chamber <NUM> of the present invention is machined by a custom-made profiling tool with accurate dimensions and high precision, which can ensure accurate dimensions of cutting section.

After the gutta-percha point is inserted into the locating hole <NUM> of corresponding specification, the sliding block <NUM> is pushed by hands, so that the sliding block <NUM> slides on the base <NUM>, the two blades <NUM> arranged symmetrically on the sliding chute <NUM> cut off the excess part of the gutta-percha point, and trim the gutta-percha point to the required dimensions, wherein the blades <NUM>, made of stainless steel blades, have a thickness of <NUM>~<NUM>, and the preferred blades <NUM> have a thickness of <NUM>; the blades <NUM> is extremely sharp, with high hardness and wear resistance. In addition, since the sliding block <NUM> is provided with an X-shaped chute <NUM>, each of the blades <NUM> is fixedly connected to the chute <NUM> by anaerobic adhesive. The anaerobic adhesive can withstand a high temperature of more than <NUM> degrees; therefore, the gutta-percha point trimmer can be sterilized at high temperature. The side of the cutting edge of each of the blades <NUM> fits closer to the horizontal plane of the guide rail <NUM>, and forms an intersection angle of <NUM>° with the horizontal plane of the guide rail <NUM>. The plane of the guide rail <NUM> protrudes from that of the base <NUM> to achieve separate height increase. The gutta-percha point is cut on the guide rail <NUM>, which can reduce unnecessary contact area of the blades <NUM> upon cutting, and can make the blades <NUM> fit closer on the guide rail <NUM>; therefore, the blades <NUM> can cut off (equivalent to shoveling off) the exposed gutta-percha point along the bottom surface of the locating hole <NUM> upon working, and the cutting section is very flat. The blade <NUM> is very thin and sharp; therefore, the gutta-percha point cannot be crushed during cutting, and the cutting section is still round. The two symmetrically-arranged blades <NUM> can cut, no matter which direction the sliding block <NUM> moves towards. Moreover, the unexposed cutting edges of the blades <NUM> are safer and more reliable; the stop block <NUM> is a limit screw, which can limit the movement of the sliding block <NUM> to prevent the sliding block <NUM> from sliding away from the base <NUM>.

The said base <NUM> and the sliding block <NUM> are made of aluminum alloy material and have been oxidized. The gutta-percha point trimmer <NUM>, solid and durable, can be sterilized at high temperature. Moreover, it is characterized by light weight, multiple colors and handsome appearance. The entire gutta-percha point trimmer, compact and lightweight, can be operated with one hand; therefore, it is simple and convenient in use. Only one person can complete the trimming of the gutta-percha point, which greatly improves work efficiency.

The said base <NUM> is provided with the guide rail <NUM>, the sliding block <NUM> is provided with the sliding chute <NUM>, the sliding chute <NUM> is obliquely provided with the two blades <NUM>, the sliding chute <NUM> is in clearance fit with the guide rail <NUM>, the locating holes <NUM> of various specifications are divided into two sets, the two sets of the locating holes <NUM> are respectively arranged at the both ends of the base <NUM>, the two sets of the locating holes <NUM> are arranged in a row along the length extension direction of the base <NUM>, and a clearance between the two sets of the locating holes <NUM> is reserved. As a result, the differences between the structure of the gutta-percha point trimmer <NUM> of the embodiment <NUM> and the structure of the gutta-percha point trimmer <NUM> of the embodiment <NUM> are as follows: the bases <NUM> are different, and the remaining structures are the same; the base <NUM> of the embodiment <NUM> is longer than that of the embodiment <NUM>; the middle is emptied by dividing the locating holes <NUM> of <NUM> different specifications into two sets equally, and processing them on the both ends of the base <NUM> respectively. The advantage of the above design is that the gutta-percha point trimmer can be held enough portion in one hand firmly, and reversed the direction to select any one of the locating holes <NUM>. Moreover, the aperture marks <NUM> of the two sets of the locating holes <NUM> are symmetrically arranged. Even if the gutta-percha point trimmer reverses the direction, the aperture mark <NUM> of the set of the locating hole <NUM> that is working is still normally displayed without overturn. Such operation is more visual.

Further, each of the locating holes <NUM> is provided with the guide chamber <NUM> and the measuring chamber <NUM>, wherein the guide chamber <NUM> is a cylindrical chamber, and the measuring chamber <NUM> is a tapered chamber.

Further, each of the blades <NUM> is made of stainless steel, with a thickness of <NUM>~<NUM>.

Further, the sliding block <NUM> is provided with an X-shaped chute <NUM>, each of the blades <NUM> is fixedly connected to the chute <NUM>, and the side of the cutting edge of each of the blades <NUM> fits closer to the horizontal plane of the guide rail <NUM>, and forms an intersection angle of <NUM>° with the horizontal plane of the guide rail <NUM>.

Further, the outer wall of the said base <NUM> is provided with the aperture marks <NUM> and the scale chutes <NUM>, wherein the aperture marks <NUM> are located at one side of the locating hole <NUM>, each of the locating holes <NUM> corresponds to one aperture mark <NUM>, and the scale chutes <NUM> are respectively located at one side of each of the guide rails <NUM>. The base <NUM> is provided with the two guide rails <NUM>, the sliding block <NUM> is provided with the two sliding chutes <NUM>, each of the sliding chutes <NUM> is obliquely provided with the two blades <NUM>, each of the sliding chutes <NUM> is in clearance fit with corresponding each of the guide rails <NUM>, the locating holes <NUM> of various specifications are divided into two sets, and the two sets of the locating holes <NUM> are arranged side by side along the width extension direction of the base <NUM>.

In this implementation mode, the dentist selects a gutta-percha point to be trimmed, determines dimensions of section to be trimmed, rotates the gutta-percha point into the locating hole <NUM> of corresponding specification, wherein the locating hole <NUM> has <NUM> specifications, "<NUM>" "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>", "<NUM>" "<NUM>", "<NUM>" and "<NUM>", which can basically meet the requirements for trimming the gutta-percha points of all specifications. Medical and nursing staff can visually determine the specification of the locating hole <NUM> by observing the aperture mark <NUM> on the side of the locating hole <NUM>, and then determine whether to insert the gutta-percha point into the locating hole <NUM> of such specification. Each of the locating holes <NUM> is provided with the guide chamber <NUM> and the measuring chamber <NUM>, wherein the guide chamber <NUM> is a cylindrical chamber, and the measuring chamber <NUM> is a tapered chamber. For example: the aperture marks <NUM> are "<NUM>" and "<NUM>", indicating the size of the diameter d of the measuring chamber <NUM> on the bottom surface; in terms of quantity, the aperture mark <NUM> is equal to <NUM> multiplied by the diameter d, namely, "<NUM>" indicates that d is equal to <NUM> and "<NUM>" indicates that d is equal to <NUM>. Due to processing difficulty of most gutta-percha point trimmers on the market, the measuring chamber <NUM> is the thin cylindrical chamber rather than the tapered chamber. However, all the gutta-percha points are tapered. If the measuring chamber <NUM> is a cylindrical chamber, upon trimming by inserting into the measuring chamber <NUM>, actually cut section diameter is smaller than theoretically trimmed section diameter. There exists an inevitable error. The measuring chamber <NUM> of the present invention is machined by a custom-made profiling tool with accurate dimensions and high precision, which can ensure accurate dimensions of cutting section.

The said base <NUM> is provided with the two guide rails <NUM>, the said sliding block <NUM> is provided with the two sliding chutes <NUM>, each of the sliding chutes <NUM> is obliquely provided with the two blades <NUM>, each of the sliding chutes <NUM> is in clearance fit with corresponding each of the guide rails <NUM>, the locating holes <NUM> of various specifications are divided into two sets, and the two sets of the locating holes <NUM> are arranged side by side along the width extension direction of the base <NUM>. As a result, the differences between the structure of the gutta-percha point trimmer <NUM> of the embodiment <NUM> and the structure of the gutta-percha point trimmer <NUM> of the embodiment <NUM> are as follows: the locating holes <NUM> of <NUM> different specifications are evenly divided into two sets, each set having <NUM> specifications; the two sets are arranged side by side on the base <NUM>; therefore, the base <NUM> in the embodiment <NUM> is the shortest in the length direction and the widest in the width direction. Since the embodiment has enough space in the width direction, the two scale chutes <NUM> are symmetrically arranged to facilitate the dentist's operation. No matter which hand holds the trimmer or the gutta-percha point, an appropriate scale chute <NUM> can be selected for visual measurement. Since the embodiment is provided with the two guide rails <NUM>, namely, the two sliding chutes <NUM>, the two blades <NUM> are symmetrically arranged on each of the sliding chutes <NUM>, and there are four blades <NUM> in total; the elastic element <NUM> and the resisting element <NUM> are installed between the two sliding chutes <NUM>, namely, between the two guide rails <NUM>, which makes pretightening effect more balanced. The both ends of the two guide rails <NUM> in the length direction are provided with the stop block <NUM>.

The benefit points of the gutta-percha point trimmer <NUM> are as follows:
Integrating measuring and cutting functions, it is characterized by simple and convenient operation, high efficiency, compactness and lightness.

The stainless steel blades with a thickness of only <NUM> are extremely sharp. The blades <NUM> are obliquely installed, and closely fit the surface of the base <NUM>. The gutta-percha point cannot be flattened upon cutting, ensuring flatness and roundness of the cutting section.

The said blades <NUM> are obliquely installed inside the sliding block <NUM> and symmetrically arranged, so that it can cut along the base <NUM> in both directions at will.

Since the said blades <NUM> are built inside the sliding block <NUM>, and cannot be touched by fingers, it is very safe and reliable in use.

The said sliding block <NUM> is in clearance fit with the base <NUM>, and is slightly pre-tightened by the compressed spring and the steel ball, so that the sliding block <NUM> cannot slide in a free state, but can easily move in a working state.

The said locating hole <NUM> is composed of the guide chamber <NUM> and the measuring chamber <NUM>. The measuring chamber <NUM> is machined by a special profiling tool, which can ensure accurate dimensions.

Claim 1:
A gutta-percha point trimmer (<NUM>),
comprising a base (<NUM>), a sliding block element (<NUM>) and a stop block (<NUM>), wherein the base (<NUM>) is provided with at least one guide rail (<NUM>) and the locating holes (<NUM>) of various specifications passing through each of the guide rails (<NUM>) and the base (<NUM>), the sliding block element (<NUM>) comprises a sliding block (<NUM>) and blades (<NUM>), the sliding block is in clearance fit with the base, the sliding block slides along the base, the sliding block is provided with a counterbore (<NUM>) and at least one sliding chute (<NUM>), the sliding chute is in clearance fit with the guide rail, the number of the blades is at least two, each of the blades is fixedly connected to the sliding block and is located inside each of the sliding chutes, each of the sliding chutes is provided with two blades arranged symmetrically, which are symmetrically arranged on the sliding chute and along the length extension direction of the guide rail, the stop block is fixedly connected to the base, and is located at both ends of the length extension direction of the base.