Root canal irrigation assembly

Abstract

A root canal flushing assembly is provided, which realizes flushing and negative pressure suction simultaneously in an integrated structure, saves the cost of root canal flushing equipment, ensures the root canal flushing effect and safety, and reduces the operation difficulty of root canal flushing. The root canal flushing assembly comprises a partition plate extending in the axial direction and separating the inner cavity of the needle cylinder into a first chamber and a second chamber, a piston is arranged in the first chamber only, and the first chamber is separated into a first part and a second part on the side of the piston handle in the axial direction, only the second part of the first chamber is communicated with the second chamber, and only the second part of the second chamber is communicated with the second chamber on the side of the piston handle. The needle head comprises a flushing needle and a liquid suction needle, the flushing needle is communicated with the first part, the liquid suction needle is communicated with the second chamber, and the liquid suction needle protrudes more to the side of the needle head than the flushing needle. According to the present application, when the piston is pushed, the flushing liquid in the first part of the first chamber is discharged from the flushing needle, at the same time, the second part and the second chamber form a negative pressure, and the liquid suction needle sucks liquid from the root tip.

Description

Technical Field

[0001] This invention relates to root canal irrigation assemblies, and more particularly to root canal irrigation assemblies for dental root canal treatment. Background Technology

[0002] Root canal treatment is an important clinical procedure for treating pulpitis and periapical periodontitis. The typical procedure involves preparing and disinfecting the root canal using mechanical and chemical methods to remove debris, bacteria, and necrotic tissue, followed by filling and sealing to prevent reinfection. Root canal irrigation is a crucial step in root canal preparation, especially for complex areas that are difficult to reach mechanically. Traditional root canal irrigation needles are widely used in clinical practice due to their low cost, ease of operation, and high safety. However, this method has certain limitations: firstly, the presence of numerous air bubbles near the apex can easily cause airlock, and the flow of irrigation fluid near the apex is extremely slow, sometimes even forming a "dead water zone," making it difficult for fresh irrigation fluid to reach, thus significantly reducing the irrigation effect; secondly, it requires strict control of apical pressure. If the irrigation speed is too high or the needle tip is accidentally inserted into the apex, excessive pressure can easily form in the apical region, causing the irrigation fluid to overflow from the apical foramen, leading to serious clinical complications such as tissue swelling and even necrosis.

[0003] To address these limitations, negative pressure irrigation devices (such as EndoVac) have been developed clinically to overcome the limitations of traditional irrigation needles. These devices utilize additional negative pressure suction tubing to penetrate deep into the apical region, thoroughly removing air and ensuring a continuous influx of fresh irrigation fluid. Simultaneously, they reduce pressure in the apical region to prevent irrigation fluid from escaping through the apical foramen, playing a crucial role in improving the effectiveness and safety of root canal irrigation. Research results also indicate that negative pressure irrigation devices significantly improve periapical cleaning efficiency, substantially reduce postoperative complications and pain, and offer advantages such as good long-term prognosis and high treatment success rates.

[0004] However, in actual use, negative pressure irrigation devices have also revealed the following problems: First, the equipment has a complex structure, including a main unit for control and digital display, a vacuum pump for creating a negative pressure environment, and a long, thin negative pressure pipeline for removing the irrigation fluid, making the equipment purchase and subsequent use costs quite expensive. Second, a dedicated external connection to the negative pressure pipeline is required before operation, and during operation, the separate inlet and negative pressure suction pipeline must be managed simultaneously, placing very high demands on clinical personnel. These reasons severely limit the widespread application of negative pressure irrigation devices in root canal treatment. Summary of the Invention

[0005] The present invention was made in view of the above-mentioned problems, and its purpose is to provide a root canal irrigation component that achieves simultaneous irrigation and negative pressure suction in an integrated structure, saves the cost of root canal irrigation equipment, ensures the effect and safety of root canal irrigation, and reduces the difficulty of root canal irrigation operation.

[0006] To achieve the above objectives, the present invention provides a root canal irrigation assembly, comprising a syringe, a needle, a piston, a push rod, and a piston handle. The needle extends axially from one end of the syringe (the side away from the piston handle, i.e., the needle side). The piston is disposed within the syringe. One end of the push rod is connected to the piston, and the other end protrudes from the other end of the syringe (the piston handle side) and is connected to the piston handle. The assembly also includes a partition extending axially and radially dividing the inner cavity of the syringe into a first chamber and a second chamber. The piston is disposed only within the first chamber and axially divides the first chamber into a first portion and a second portion. The second portion is axially further away from the first portion. The first chamber communicates only with the second chamber via the second portion, and the second portion communicates with the second chamber only axially on the other side. The needle comprises an irrigation needle and an aspiration needle. The irrigation needle communicates with the first portion, and the aspiration needle communicates with the second chamber and protrudes further axially than the irrigation needle.

[0007] According to the root canal irrigation assembly of the present invention, when performing root canal irrigation, there is no need for traditional negative pressure equipment such as vacuum pumps, thus saving the cost of root canal irrigation equipment. On the other hand, when performing root canal irrigation, by pushing the piston upward on one side via the piston handle, the irrigation fluid in the first chamber can be injected into the root canal of the tooth from the irrigation needle. At the same time, the pressure in the closed second part of the first chamber and the second chamber decreases, forming a negative pressure, which allows the aspiration needle to aspirate fluid from near the apex of the root canal, realizing the simultaneous injection and aspiration of fluid into the root canal. Therefore, the root canal irrigation effect can be ensured and the operation difficulty of root canal irrigation can be reduced.

[0008] Furthermore, in the root canal irrigation assembly of the present invention, it is preferable that the cross-sectional area of ​​the first chamber is larger than the cross-sectional area of ​​the second chamber.

[0009] According to the root canal irrigation assembly of the present invention, when the piston is pushed out to the axially upward side, the negative pressure of the second chamber is easily enhanced. Therefore, the air removal effect in the apical region can be improved, ensuring that fresh irrigation fluid continuously enters the apical region. At the same time, the pressure in the apical region can be reduced, preventing the irrigation fluid from rushing out of the apical foramen, thereby improving the effectiveness and safety of root canal irrigation.

[0010] Furthermore, in the root canal irrigation assembly of the present invention, the aspiration needle is preferably movable axially, and a locking member is also included, which locks the position of the aspiration needle relative to the irrigation needle in the axial direction.

[0011] According to the root canal irrigation assembly of the present invention, the position of the aspiration needle relative to the irrigation needle in the axial direction can be adjusted, thus expanding the applicability of the root canal irrigation assembly; on the other hand, after the position of the aspiration needle in the axial direction is adjusted, it can be locked by a locking member, thus preventing the irrigation needle from moving during root canal irrigation and causing irrigation accidents.

[0012] Furthermore, in the root canal irrigation assembly of the present invention, the aspiration needle preferably includes: a retaining section extending axially, with its other axial side located within the second chamber; a parallel section parallel to the irrigation needle; and a connecting section extending curvedly from the retaining section to the parallel section.

[0013] Furthermore, in the root canal irrigation assembly of the present invention, a seal is preferably provided at the portion of the syringe through which the retaining section penetrates, the seal sealing the second chamber relative to the external space.

[0014] Furthermore, in the root canal irrigation assembly of the present invention, the syringe preferably includes a syringe body and a top cover. The syringe body is cylindrical with a bottom and an opening on the other side in the axial direction. The bottom of the syringe body is penetrated by the aspiration needle. The top cover is detachably assembled to the syringe body, closes the opening of the syringe body, and is penetrated by the push rod. A sealing element is provided in the portion of the syringe body penetrated by the aspiration needle, and a sealing ring is provided in the portion of the top cover penetrated by the push rod.

[0015] According to the root canal irrigation assembly of the present invention, after use, simply unscrewing the top cap allows for easy emptying of the second part of the first chamber and the waste fluid, debris, etc., in the second chamber for subsequent use.

[0016] Furthermore, in the root canal irrigation assembly of the present invention, the locking member is preferably switchable between a locked state and an unlocked state. In the locked state, the locking member restricts the aspiration needle from moving axially relative to the irrigation needle, and in the unlocked state, the locking member allows the aspiration needle to move axially relative to the irrigation needle.

[0017] Furthermore, in the root canal irrigation assembly of the present invention, it is preferable that the irrigation needle and the aspiration needle are each provided with a marking portion indicating the position.

[0018] According to the root canal irrigation assembly of the present invention, the relative axial position of the aspiration needle and the marked portion of the irrigation needle can be determined based on the parallel section of the aspiration needle and the marked portion of the irrigation needle, thereby determining the depth of the aspiration needle inserted into the root canal.

[0019] Furthermore, in the root canal irrigation assembly of the present invention, it is preferable that the marking portion of the irrigation needle is a color band whose color changes along the length direction of the irrigation needle, and the marking portion of the aspiration needle is a color band whose color changes along the length direction of the aspiration needle.

[0020] According to the root canal irrigation assembly of the present invention, it is easier to distinguish the depth of the irrigation needle and the aspiration needle inserted into the root canal.

[0021] Furthermore, in the root canal irrigation assembly of the present invention, it is preferable that the tip of the irrigation needle is provided with an outlet consisting of a side opening.

[0022] Furthermore, in the root canal irrigation assembly of the present invention, it is preferable that at least one row of suction ports is provided at the tip of the suction needle.

[0023] Furthermore, in the root canal irrigation assembly of the present invention, each row of suction ports preferably includes a plurality of holes spaced apart in the circumferential direction.

[0024] Furthermore, in the root canal irrigation assembly of the present invention, the distance between the suction port and the tip of the suction needle is preferably 0.2-0.7 mm.

[0025] (Invention effect)

[0026] According to the present invention, irrigation and negative pressure suction can be performed simultaneously in an integrated structure. Specifically, when performing root canal irrigation, there is no need for traditional negative pressure equipment with a main unit, vacuum pump, etc., thus saving the cost of root canal irrigation equipment. On the other hand, when performing root canal irrigation, by pushing the piston upward axially through the piston handle, the irrigation fluid in the first chamber can be injected into the root canal of the tooth through the irrigation needle. At the same time, the pressure in the second part of the closed first chamber and the second chamber decreases, forming a negative pressure, which allows the suction needle to aspirate fluid from near the apex. This achieves simultaneous injection and aspiration of fluid into the root canal. Furthermore, by having the suction needle aspirate fluid from near the apex, it is not only beneficial for fresh irrigation fluid to enter the apical region, but also beneficial for reducing the pressure near the apex. Therefore, the effectiveness and safety of root canal irrigation can be ensured, and the operation difficulty of root canal irrigation can be reduced. Attached Figure Description

[0027] Figure 1A This is a side sectional view schematically illustrating an embodiment of the root canal irrigation assembly of the present invention.

[0028] Figure 1B This is a partially enlarged view schematically illustrating a portion of the needle of the root canal irrigation assembly according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic representation of the root canal irrigation assembly according to an embodiment of the present invention. Figure 1A The image shown is the one where arrow A is observed.

[0030] Figure 3 This is a schematic representation of the root canal irrigation assembly according to an embodiment of the present invention. Figure 1A The image shown is the one where arrow BB is observed.

[0031] Figure 4 This is a schematic representation of the root canal irrigation assembly according to an embodiment of the present invention. Figure 1A The image shown is the one where the arrow CC is observed.

[0032] Figure 5 This diagram schematically illustrates the locking state of the locking member included in the root canal irrigation assembly according to an embodiment of the present invention.

[0033] Figure 6 This diagram schematically illustrates the unlocked state of the locking member included in the root canal irrigation assembly according to an embodiment of the present invention.

[0034] (Symbol Explanation)

[0035] 1. Root canal irrigation assembly;

[0036] 11. Syringe;

[0037] 111 Syringe body;

[0038] 1111 bottom wall;

[0039] 1112 Sidewall;

[0040] 1113 Nipple;

[0041] 112 Top cover;

[0042] 1121 plate;

[0043] 1122 Tubular part;

[0044] 12 needles;

[0045] 121 Irrigation needle;

[0046] 1211 liquid outlet;

[0047] 1212 Needle plug;

[0048] 122. Aspiration needle;

[0049] 1221 Maintaining section;

[0050] 1222 Parallel segments;

[0051] 1223 Connecting segment;

[0052] 1229 Suction port;

[0053] 13 Pistons;

[0054] 14. Putter;

[0055] 15. Piston handle;

[0056] 16. Partitions;

[0057] 17. Locking components;

[0058] 170 Shaft section;

[0059] 171 First plate;

[0060] 1711 Depression;

[0061] 172 Second plate;

[0062] 1721 A sudden rise;

[0063] 18. Sealing ring;

[0064] 19. Seals;

[0065] C1 First Chamber;

[0066] C11 Part 1;

[0067] C12 Part Two;

[0068] C2 Second Chamber;

[0069] L1 is the side that is axially upwards;

[0070] The other side of L2 axis. Detailed Implementation

[0071] Below, in conjunction with Figures 1A to 6 The root canal irrigation assembly (also referred to as the root canal irrigation syringe assembly) according to an embodiment of the present invention will be described.

[0072] For ease of explanation, the direction of extension of the syringe axis of the root canal irrigation assembly is referred to as the axial direction, the radial direction centered on the syringe axis is referred to as the radial direction, and one side of the axial direction is designated as L1, and the other side of the axial direction is designated as L2.

[0073] (Overall structure of the root canal irrigation assembly)

[0074] like Figure 1A As shown, the root canal irrigation assembly 1 includes a syringe 11, a needle 12, a piston 13, a push rod 14, and a piston handle 15. The needle 12 extends axially from one end L1 (the side away from the piston handle 15, i.e., the needle side) of the syringe 11. The piston 13 is disposed inside the syringe 11. One end of the push rod 14 is connected to the piston 13, and the other end protrudes from the other end L2 (the piston handle side) of the syringe 11 and is connected to the piston handle 15.

[0075] like Figure 1A As shown, the root canal irrigation assembly 1 also includes a partition 16. The partition 16 extends axially and radially divides the inner cavity of the syringe 11 into a first chamber C1 and a second chamber C2. The piston 13 is disposed only in the first chamber C1 and can axially divide the first chamber C1 into a first portion C11 and a second portion C12. The second portion C12 is located on the opposite side L2 axially than the first portion C11. The first chamber C1 communicates with the second chamber C2 only through the second portion C12, and the second portion C12 communicates with the second chamber C2 only on the opposite side L2 axially.

[0076] like Figure 1A As shown, the needle 12 includes a flushing needle 121 and an aspiration needle 122. The flushing needle 121 communicates with the first portion C11 of the first chamber C1. The aspiration needle 122 communicates with the second chamber C2 and protrudes further axially to one side L1 than the flushing needle 121. Furthermore, the aspiration needle 122 is axially movable.

[0077] like Figure 1A As shown, the root canal irrigation assembly 1 also includes a locking member 17, which can lock the position of the aspiration needle 122 relative to the irrigation needle 121 in the axial direction.

[0078] like Figure 1A As shown, a sealing ring 18 is provided at the part of the syringe 11 through which the push rod 14 passes, and the sealing ring 18 seals the inner cavity of the syringe 11 relative to the external space.

[0079] like Figure 1A As shown, a sealing element 19 is provided at the part of the syringe 11 through which the aspirating needle 122 penetrates, and the sealing element 19 seals the second chamber C2 relative to the external space.

[0080] (Structure of a syringe)

[0081] like Figure 1A As shown, the syringe 11 includes a syringe body 111 and a top cover 112. The syringe body 111 is cylindrical with a bottom and has an opening L2 on the other side in the axial direction. The top cover 112 is detachably assembled to the syringe body 111, closes the opening of the syringe body 111, and is penetrated by a push rod 14.

[0082] Here, as Figures 1A to 4As shown, the syringe body 111 has a bottom wall 1111 and a side wall 1112. The bottom wall 1111 is circular when viewed axially. A central hole extending axially through the center of the bottom wall 1111 is formed therein, and a tubular nipple 1113 protrudes axially towards one side L1 around the central hole. An axially extending peripheral hole is formed on the bottom wall 1111 at a position radially outward from the central hole, through which the aspiration needle 122 passes. The side wall 1112 extends from the periphery of the bottom wall 1111 towards the other side L2 axially. The side wall 1112 is cylindrical when viewed axially. An internal thread is formed on the inner surface of the other side L2 axially of the side wall 1112. A partition 16 extends from the bottom wall 1111 toward the axial side L2. Both circumferential ends of the partition 16 are connected to the side wall 1112. The end of the axial side L2 of the partition 16 is kept at a certain distance from the end face of the axial side L1 of the top cover 112, preferably 4-6 mm apart. That is, the end of the axial side L2 of the second part C12 of the first chamber C1 communicates with the end of the axial side L2 of the second chamber C2. When viewed axially, the central hole and the outer peripheral hole of the bottom wall 1111 are located on both sides of the partition 16. The partition 16 can be formed as a straight line when viewed axially, or it can be formed as an arc when viewed axially. A seal 19 is provided at the end of the axial side L1 of the second chamber C2, which is separated by the partition 16. The seal 19 is block-shaped. A portion of the outer peripheral surface of the seal 19 abuts against the side wall 1112, and the remainder abuts against the partition 16. The end face of one axial side L1 of the seal 19 abuts against the bottom wall 1111. Thus, the seal 19 can prevent the suction needle 122 from passing through its interior and from reducing the airtightness of the second chamber C2 when it moves back and forth.

[0083] In addition, such as Figures 1A to 4 As shown, the top cover 112 has a plate-shaped portion 1121 and a cylindrical portion 1122. The plate-shaped portion 1121 extends in a plane perpendicular to the axial direction, is elliptical when viewed axially, and has a central hole formed in the center for the push rod 14 to pass through axially. A sealing ring 18 is fixed to the center of the end face of the plate-shaped portion 1121 on the other side L2 in the axial direction, for example by adhesive bonding, thereby achieving a reliable seal of the inner cavity of the syringe 11 by means of the sealing ring 18 when the piston handle 15 is pushed or pulled. The cylindrical portion 1122 protrudes from the plate-shaped portion 1121 on the axially upward side L1 and is circular when viewed axially. An external thread is formed on the outer peripheral surface of the cylindrical portion 1122. During assembly, the external thread of the cylindrical portion 1122 is screwed into the internal thread of the side wall 1112.

[0084] In addition, such as Figure 1A As shown, the inner cavity of the syringe 11 is formed by the syringe body 111 and the top cover 112. The inner cavity of the syringe 11 is divided by a partition 16 to form a first chamber C1 and a second chamber C2. Figure 4As shown, preferably, the cross-sectional area of ​​the first chamber C1 is larger than the cross-sectional area of ​​the second chamber C2. More preferably, the cross-sectional area of ​​the first chamber C1 is 5-7 times the cross-sectional area of ​​the second chamber C2.

[0085] (Needle and its locking mechanism)

[0086] like Figure 1A As shown, the needle 12 includes a flushing needle 121 and an aspiration needle 122. The flushing needle 121 communicates with the first part C11. The aspiration needle 122 communicates with the second chamber C2 and protrudes further axially to one side L1 than the flushing needle 121.

[0087] Here, as Figure 1A As shown, the irrigation needle 121 is made of, for example, a metal alloy, and is generally straight with a slender cylindrical thin-walled structure in cross-section, hollow inside for the flow of irrigation fluid. The length of the irrigation needle 121 is 28-32 mm, the outer diameter is 250-310 µm, the inner diameter is 140-200 µm, and the difference between the inner and outer diameters is preferably 110 µm. Preferably, the length of the irrigation needle 121 is 30 mm, the outer diameter is 280 µm, and the inner diameter is 170 µm. An outlet 1211, consisting of a side opening, is provided at the tip of the irrigation needle 121. Under manual application of force, the irrigation fluid flows out from the outlet 1211, achieving root canal irrigation. The distance from the outlet 1211 to the tip of the needle is 2-3 times, preferably 2.5 times, the outer diameter of the irrigation needle 121, and the length (axial) dimension of the outlet 1211 in the length direction (axial direction) of the irrigation needle 121 is 3-5 times, preferably 4 times, the outer diameter of the irrigation needle 121. A needle plug 1212 is provided at the tail end of the irrigation needle 121, i.e., at the end of the other side L2 in the axial direction. The irrigation needle 121 can be assembled into the syringe 11 by fitting the needle plug 1212 onto the nipple 1113. The surface of the irrigation needle 121 has a graduated color band indicating the depth of insertion of the irrigation needle 121 into the root canal; the color of the band changes along the length (axial direction) of the irrigation needle 121. Preferably, as shown... Figure 1B As illustrated, the rinsing needle 121 retains its original metallic color 0-6mm from the tip, is red 6-9mm from the tip, orange 9-12mm, green 12-15mm, blue 15-18mm, purple 18-21mm, and white 21-24mm from the tip.

[0088] In addition, such as Figure 1AAs shown, the aspiration needle 122 is made of, for example, a metal alloy, and is generally curved, with a slender cylindrical thin-walled structure in cross-section, and is hollow inside for the flow of flushing fluid. The aspiration needle 122 has a length of 60-70 mm, an outer diameter of 250-310 µm, and an inner diameter of 140-200 µm, with the difference between the inner and outer diameters preferably being 110 µm. Preferably, the aspiration needle 122 has a length of 65 mm, an outer diameter of 280 µm, and an inner diameter of 170 µm. A suction port 1229 is provided at the tip of the aspiration needle 122. The tail end of the aspiration needle 122, i.e., the end on the other side L2 in the axial direction, extends into the second chamber C2 through the outer peripheral hole of the bottom wall 1111. Specifically, the aspiration needle 122 includes: a retaining section 1221 extending axially, with its other axial side L2 located within the second chamber C2; a parallel section 1222 parallel to the flushing needle 121; and a connecting section 1223 extending bently from the retaining section 1221 to the parallel section 1222. The retaining section 1221 axially penetrates the seal 19. A suction port is provided on one axial side L1 of the parallel section 1222. The surface of the aspiration needle 122 is provided with a graduated color band, the color of which changes along the length (axial direction) of the aspiration needle 122. Preferably, as shown... Figure 1B As illustrated, the aspiration needle 122 retains its original metallic color 0-6 mm from the tip, is red 6-9 mm from the tip, orange 9-12 mm, green 12-15 mm, blue 15-18 mm, purple 18-21 mm, and white 21-24 mm from the tip. Preferably, the aspiration port 1229 is 0.2-0.7 mm from the tip, more preferably 0.4 mm. The aspiration ports 1229 have at least one row (e.g., three rows), each row including multiple holes spaced apart circumferentially (e.g., four small round holes equally spaced circumferentially). These holes allow for the absorption of irrigating fluid from the root apex under negative pressure conditions, reducing pressure near the root apex.

[0089] In addition, the tip of the aspiration needle 122 is positioned further axially on one side L1 than the tip of the irrigation needle 121, and the two are axially separated by 1-5 mm, preferably 3 mm.

[0090] (Structure of piston, push rod and piston handle)

[0091] like Figure 1A As shown, piston 13 is disposed in the first chamber C1.

[0092] Here, as Figure 1A As shown, a portion of the outer peripheral surface of the piston 13 abuts against the side wall 1112 of the syringe body 111, while the remainder abuts against the partition 16. Figure 4 As shown, when viewed along the axial direction, piston 13 has a shape in which a portion of the outer circumference of a circle has been cut off.

[0093] like Figure 1A As shown, push rod 14 passes through top cover 112.

[0094] Here, as Figure 1A As shown, the push rod 14 extends axially through the central hole of the top cover 112. One axial side L1 of the push rod 14 is inserted into the second part C12 of the first chamber C1. The end of the axial side L1 of the push rod 14 is connected to the piston 13, for example, by a thread, and the end of the other axial side L2 of the push rod 14 protrudes to the outside of the syringe 11. Figure 3 and Figure 4 As shown, the push rod 14 has a circular cross-section, but it can also be formed into other shapes such as square. The push rod 14 passes through the sealing ring 18 fixed to the top cover 112.

[0095] like Figure 1A As shown, the center of the piston handle 15 is connected to the end of the push rod 14 on the other side L2 in the axial direction. The piston handle 15 is assembled to the push rod 14 by threads or the like. Figure 2 As shown, when viewed along the axial direction, the piston handle 15 appears circular, but it can also be formed into other shapes such as ellipse.

[0096] (Structure of the locking component)

[0097] like Figure 1A As shown, locking member 17 locks the flushing needle 121 and the aspiration needle 122 together.

[0098] Here, as Figure 1A As shown, locking member 17 locks the parallel segment 1222 of the aspiration needle 122 relative to the flushing needle 121. Preferably, locking member 17 can switch between a locked state and an unlocked state. In the locked state, locking member 17 restricts axial movement of the aspiration needle 122 relative to the flushing needle 121; in the unlocked state, locking member 17 allows axial movement of the aspiration needle 122 relative to the flushing needle 121. Specifically, as... Figure 5 and Figure 6As shown, the locking member 17 may include a first plate 171 and a second plate 172 rotatably connected via a shaft 170. A flushing needle 121 and an aspiration needle 122 pass between the first plate 171 and the second plate 172. The sides of the first plate 171 and the second plate 172 opposite to the shaft 170 can be engaged or disengaged (in the illustrated example, the first plate 171 has a recess 1711, and the second plate 172 has a protrusion 1721 that engages with the recess 1711). When the locking member 17 is locked, the first plate 171 and the second plate 172 clamp the flushing needle 121 and the aspiration needle 122, and the friction between the first plate 171 and the aspiration needle 122 restricts the axial movement of the aspiration needle 122 relative to the flushing needle 121. To facilitate locking the flushing needle 121 and the aspiration needle 122 together, the roughness of the areas on the flushing needle 121 and the aspiration needle 122 where the locking member 17 is installed can be made larger. In addition, the locking member 17 can be integrally formed of resin, or it can be pre-fixed to one of the flushing needle 121 and the aspiration needle 122.

[0099] In addition, such as Figure 1A As shown, two locking elements 17 are provided along the length of the flushing needle 121, but only one or more can be provided.

[0100] (An example of the assembly of a root canal irrigation assembly)

[0101] First, after connecting one end of the push rod 14 to the piston 13, the piston 13 and the push rod 14 are pressed into the first chamber C1 of the syringe 11.

[0102] Next, with the push rod 14 passing through the top cover 112, the top cover 112 is screwed to the end of the syringe body 111 on the other side L2 in the axial direction.

[0103] Next, screw the push rod 14 to the piston handle 15.

[0104] Next, the flushing needle 121 is connected to the nipple 1113 via the needle plug 1212.

[0105] Next, the suction needle 122 is passed through the seal 19 and inserted into the second chamber C2.

[0106] Finally, the flushing needle 121 and the aspiration needle 122 are locked together using the locking member 17.

[0107] Here, it is preferable that the sealing ring 18 is pre-fixed to the top cover 112 before assembly, and the sealing element 19 is pre-fixed to the bottom of the second chamber C2 before assembly.

[0108] (Use of the root canal irrigation kit)

[0109] First, measure the length of the root canal (specifically, obtain a CBCT 3D image of the oral cavity and measure it using computer visualization software to determine the distance from the coronal to the apex of the root canal, i.e., the length of the root canal). Determine the insertion depth of the aspiration needle 122 (for example, if the root canal is 15mm long, the insertion depth range is 14.5-14.8mm, ensuring that the tip of the aspiration needle 122 is 0.2-0.5mm away from the apex), and mark the corresponding position on the graduated band of the aspiration needle 122. This ensures that when inserting the aspiration needle 122, the needle tip is not too far from the apex, which would affect the negative pressure aspiration effect at the apex, and that the needle tip is not inserted too deeply, protruding from the apical foramen and causing the irrigating fluid to overflow into the periodontal tissues, causing damage, pain, inflammation, and tissue necrosis.

[0110] Next, switch the locking element 17 to the unlocked state, adjust the front and rear positions of the flushing needle 121 and the aspiration needle 122, and then switch the locking element 17 to the locked position for reliable locking.

[0111] Next, fill the first chamber C1 (first part C11) of the root canal irrigation assembly 1 with irrigation fluid (specifically, first unscrew the top cap 112, then insert the needle 12 into the medicine bottle, push the piston handle 15 up, and then screw the top cap 112 back on), insert it into the root canal, and then slowly push the piston handle 15 to move the piston 13 down. The air pressure above the piston 13 decreases, forming a negative pressure. Since the upper ends of the first chamber C1 and the second chamber C2 are connected, the pressure in the second chamber C2 decreases accordingly, allowing the aspiration needle 122 to aspirate fluid from the root tip, thus achieving simultaneous infusion and aspiration of fluid into the root canal.

[0112] Once the second chamber C2 is full, the fluid in the second chamber C2 will enter the second part C1 (C12) of the first chamber C1 through the connection between the first chamber C1 and the second chamber C2. After all the fresh rinsing fluid in the first chamber C1 (C11) of the root canal irrigation assembly 1 has been pushed to the outside, the entire root canal irrigation assembly 1 is removed from the root canal. Pushing the piston 13 upward will discharge the rinsing fluid drawn up above the piston 13 and into the second chamber C2 (or the top cover 112 can be unscrewed directly, and the rinsing fluid drawn up above the piston 13 and into the second chamber C2 can be poured out). Then, the root canal irrigation assembly 1 draws fresh rinsing fluid from the outside again. After the first chamber C1 is full, the above steps are repeated to continue root canal irrigation.

[0113] (Main effects of this implementation method)

[0114] According to the root canal irrigation assembly 1 of this embodiment, compared with traditional irrigation needles that can only dispense liquid and cannot simultaneously aspirate irrigation waste liquid and debris near the root apex, it can more efficiently remove debris and bacteria in the root apex area, reduce pressure in the root apex area, and improve the safety while enhancing the effectiveness of root canal irrigation; on the other hand, compared with external dedicated negative pressure irrigation devices, the equipment cost and clinical operation difficulty are greatly reduced.

[0115] Furthermore, according to the root canal irrigation assembly 1 of this embodiment, both the irrigation needle 121 and the aspiration needle 122 have graduated color bands, which provide good visualization and prevent the aspiration needle 122 from being inserted too deeply or too shallowly, thus affecting the effect. It also makes it easier to observe the front-to-back positional relationship between the two.

[0116] Furthermore, according to the root canal irrigation assembly 1 of this embodiment, the relative positions of the irrigation needle 121 and the suction needle 122 can be freely adjusted as needed at any time, and can be reliably locked by the locking member 17 after adjustment.

[0117] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments.

[0118] For example, in the above embodiment, the cross-section of the syringe body 111 is circular, but it can also be formed into other shapes such as ellipse.

[0119] Furthermore, in the above embodiment, the push rod 14 and the piston 13 are formed separately, but it is not limited to this, and the push rod 14 and the piston 13 can also be formed as one piece.

[0120] Furthermore, in the above embodiments, the partition 16 can be integrally formed with the syringe body 111, or it can be formed separately from the syringe body 111.

[0121] Furthermore, in the above embodiments, the colors of the scale bands on the rinsing needle 121 and the aspiration needle 122 can be reversed, except for the original metal color portion.

[0122] In addition, in the above embodiments, graduation lines can be provided on the rinsing needle 121 and the aspiration needle 122 instead of graduation ribbons.

[0123] Furthermore, in the above embodiments, the push rod 14 and the flushing needle 121 can extend coaxially or be offset from each other.

[0124] It should be understood that within the scope of this invention, the various parts of the embodiments can be freely combined, or the various parts of the embodiments can be appropriately modified or omitted.

Claims

1. A root canal irrigation assembly comprising a syringe, a needle, a piston, a push rod, and a piston handle, the needle extending from an end of one side in an axial direction of the syringe toward the one side in the axial direction, the piston being disposed in the syringe, one end of the push rod being connected to the piston and the other end protruding from an end of the other side in the axial direction of the syringe and being connected to the piston handle, characterized by further comprising a partition extending in the axial direction and dividing an inner cavity of the syringe into a first chamber and a second chamber, the piston being disposed only in the first chamber and being capable of dividing the first chamber into a first portion and a second portion in the axial direction, the second portion being on the other side in the axial direction than the first portion, only the second portion of the first chamber being in communication with the second chamber, and only the second portion being in communication with the second chamber on the other side in the axial direction, the needle comprising an irrigation needle and an aspiration needle, the irrigation needle being in communication with the first portion, and the aspiration needle being in communication with the second chamber and protruding more toward the one side in the axial direction than the irrigation needle.

2. The root canal irrigation assembly according to claim 1, characterized in that a cross-sectional area of the first chamber is larger than a cross-sectional area of the second chamber.

3. The root canal irrigation assembly according to claim 1, characterized in that the aspiration needle is movable in the axial direction, and further comprising a lock capable of locking a position of the aspiration needle in the axial direction relative to the irrigation needle.

4. The root canal irrigation assembly according to claim 3, characterized in that the lock is switchable between a locked state and an unlocked state, in the locked state, the lock restricts the aspiration needle from moving in the axial direction relative to the irrigation needle, and in the unlocked state, the lock allows the aspiration needle to move in the axial direction relative to the irrigation needle.

5. The root canal irrigation assembly according to claim 3, characterized in that the aspiration needle comprises a holding section extending in the axial direction and on the other side in the axial direction than the second chamber, a parallel section parallel to the irrigation needle, and a connecting section extending from the holding section to the parallel section in a bent manner.

6. The root canal irrigation assembly according to claim 5, characterized in that a seal is provided at a portion of the syringe penetrated by the holding section, and the seal seals the second chamber from an outside space.

7. The root canal irrigation assembly according to claim 1, characterized in that the irrigation needle and the aspiration needle are respectively provided with a marker indicating a position.

8. The root canal irrigation assembly according to claim 7, characterized in that the marker of the irrigation needle is a color band in which a color changes along a length direction of the irrigation needle, and the marker of the aspiration needle is a color band in which a color changes along a length direction of the aspiration needle.

9. The root canal irrigation assembly according to claim 1, characterized in that the syringe comprises a syringe main body and a cap, the syringe main body is a bottomed cylinder open on the other side in the axial direction, and a bottom of the syringe main body is penetrated by the aspiration needle. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The top cover is detachably assembled to the needle cylinder body, closes the opening of the needle cylinder body, and is penetrated by the push rod, A sealing member is arranged at the part of the needle cylinder body penetrated by the liquid suction needle, A sealing ring is arranged at the part of the top cover penetrated by the push rod.

10. The root canal irrigation assembly according to claim 1, wherein, A liquid outlet composed of a lateral opening is arranged at the needle tip of the irrigation needle, At least one row of liquid suction openings is arranged at the needle tip of the liquid suction needle, Each row of the liquid suction openings comprises a plurality of holes arranged at intervals in the circumferential direction, The distance between the liquid suction openings and the tip end of the liquid suction needle is 0.2-0.7 mm.

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