Root canal flushing assembly

Abstract

According to the root canal flushing assembly, flushing and negative pressure suction are synchronously carried out through an integrated structure, the cost of root canal flushing equipment is saved, the root canal flushing effect and safety are ensured, and the operation difficulty of root canal flushing is reduced. The root canal flushing assembly comprises a partition plate which extends in the axial direction and divides an inner cavity of the needle cylinder into a first cavity and a second cavity in the radial direction, the piston is only arranged in the first cavity and can divide the first cavity into a first part and a second part closer to the piston handle side than the first part in the axial direction, and only the second part of the first cavity communicates with the second cavity. The needle includes a flushing needle in communication with the first portion and a liquid suction needle in communication with the second chamber, the liquid suction needle protruding further toward the needle side than the flushing needle. According to the invention, when the piston is pushed, flushing fluid in the first part of the first chamber is discharged from the flushing needle, and at the same time, negative pressure is formed between the second part and the second chamber, so that the fluid suction needle sucks fluid from the vicinity of the root tip.

Description

Technical Field

[0001] The invention relates to a root canal irrigation component, in particular to a root canal irrigation component used for tooth root canal treatment. Background Art

[0002] Root canal therapy is an important clinical procedure for treating endodontic and periapical diseases. The typical procedure involves mechanical and chemical preparation and disinfection to remove debris, bacteria, and necrotic tissue from the root canal. Filling and sealing are then performed to prevent re-infection. Root canal irrigation is a crucial step in root canal preparation, especially for complex areas difficult to reach with mechanical preparation. Traditional root canal irrigation needles offer advantages such as low cost, ease of use, and high safety, making them a widely used irrigation method in clinical practice. However, this irrigation method has certain limitations. Firstly, the presence of numerous bubbles near the root apex can easily cause an air lock effect. Furthermore, the irrigant flow rate near the root apex can be extremely slow, even forming a "stagnant water zone," making it difficult for fresh irrigant to reach the root apex, significantly reducing the effectiveness of irrigation. Secondly, high apical pressure control is required. Excessive irrigation speed or inadvertent insertion of the needle tip into the root apex can easily lead to high pressure buildup in the root apex, causing the irrigant to flush out of the apical foramen, leading to serious clinical complications such as tissue swelling and even necrosis.

[0003] To address this issue, negative pressure irrigation devices (such as EndoVac) have been developed clinically to address the limitations of traditional irrigation needles. These devices utilize an additional negative pressure suction line to penetrate deep into the root apex, completely expelling air from the apical region and ensuring continuous flow of fresh irrigation fluid. They also reduce apical pressure and prevent the flushing fluid from escaping the apical foramen, playing a significant role in improving the effectiveness and safety of root canal irrigation. Research results have also demonstrated that negative pressure irrigation devices can significantly improve cleaning efficiency near the root apex, significantly reduce postoperative complications and pain, and offer advantages such as good long-term prognosis and a high treatment success rate.

[0004] However, in actual use, negative pressure irrigation devices have also exposed the following problems: First, the device structure is complex, including a main unit for control and digital display, a vacuum pump for creating the negative pressure environment, and a slender negative pressure pipeline for aspirating the irrigation fluid, making the equipment procurement and subsequent use costs relatively high. Second, the negative pressure pipeline must be specially connected before operation, and during operation, the clinician must take into account the separate liquid inlet and negative pressure aspiration pipeline, which is very demanding. These reasons have seriously limited the widespread application of negative pressure irrigation devices in root canal treatment. Summary of the Invention

[0005] The present invention is completed in view of the above problems, and its purpose is to provide a root canal flushing assembly that uses an integrated structure to achieve simultaneous flushing and negative pressure suction, saving the cost of root canal flushing equipment, ensuring the root canal flushing effect and safety, and reducing the operational difficulty of root canal flushing.

[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, wherein the needle extends from an end portion of the syringe on one axial side (the side away from the piston handle, i.e., the needle side) toward one axial side, the piston is disposed in the syringe, one end of the push rod is connected to the piston, and the other end protrudes from an end portion of the syringe on the other axial side (the piston handle side) and is connected to the piston handle, wherein the assembly further comprises a partition plate extending axially and radially 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 axially dividing the first chamber into a first portion and a second portion, the second portion being closer to the other axial side than the first portion, the first chamber having only the second portion in communication with the second chamber, and the second portion being in communication with the second chamber only on the other axial side, the needle comprising an irrigation needle and a liquid aspiration needle, the irrigation needle being in communication with the first portion, the liquid aspiration needle being in communication with the second chamber, and protruding further axially than the irrigation needle.

[0007] According to the root canal flushing assembly of the present invention, when performing root canal flushing, there is no need for traditional negative pressure equipment with a vacuum pump, etc., thereby saving the cost of root canal flushing equipment; on the other hand, when performing root canal flushing, by pushing the piston toward one side in the axial direction through the piston handle, the flushing liquid in the first chamber can be injected into the root canal of the tooth from the flushing needle. At the same time, the pressure in the second part of the closed first chamber and the second chamber is reduced to form a negative pressure, so that the aspiration needle aspirates liquid from near the root apex, thereby achieving simultaneous injection and aspiration in the root canal, thereby ensuring the root canal flushing effect and reducing the operational difficulty of root canal flushing.

[0008] Furthermore, in the root canal irrigation assembly of the present invention, it is preferred 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 flushing assembly of the present invention, when the piston is pushed toward one side in the axial direction, the negative pressure in the second chamber is easily increased, thereby improving the exhaust effect of air in the apical area and ensuring that fresh flushing fluid continuously enters the apical area. At the same time, it can reduce the pressure in the apical area and prevent the flushing fluid from rushing out of the apical foramen, thereby improving the effectiveness and safety of root canal flushing.

[0010] Furthermore, in the root canal irrigation assembly of the present invention, it is preferred that the aspiration needle can move in the axial direction, and further comprises a locking member capable of locking the axial position of the aspiration needle relative to the irrigation needle.

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

[0012] In addition, in the root canal irrigation assembly of the present invention, the aspiration needle preferably includes: a retaining section, which extends axially and whose other axial side is located in the second chamber; a parallel section, which is parallel to the irrigation needle; and a connecting section, which bends and extends from the retaining section to the parallel section.

[0013] Furthermore, in the root canal irrigation assembly of the present invention, a sealing member is preferably provided at a portion of the barrel penetrated by the holding section, and the sealing member seals the second chamber from the external space.

[0014] In addition, in the root canal flushing assembly of the present invention, the syringe preferably includes a syringe body and a top cover, the syringe body is in the shape of a bottom cylinder and is open on the other side in the axial direction, the bottom of the syringe body is penetrated by the pipette needle, the top cover is assembled to the syringe body in a detachable manner, closes the opening of the syringe body, and is penetrated by the push rod, a sealing member is provided on the portion of the syringe body penetrated by the pipette needle, and a sealing ring is provided on 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, the top cover only needs to be unscrewed to conveniently pour out the second part of the first chamber and the waste liquid, debris, etc. in the second chamber for subsequent use.

[0016] In addition, in the root canal irrigation assembly of the present invention, it is preferred that the locking member can be switched between a locked state and an unlocked state, in which the locking member limits the axial movement of the aspiration needle relative to the irrigation needle and in the unlocked state 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 preferred that the irrigation needle and the aspiration needle are each provided with a marking portion indicating a position.

[0018] According to the root canal irrigation assembly of the present invention, the relative positions of the parallel section of the pipette needle and the marking portion of the irrigation needle in the axial direction can be determined, thereby knowing the depth of the pipette needle inserted into the root canal.

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

[0020] According to the root canal irrigation assembly of the present invention, it is easier to distinguish the depths to which the irrigation needle and the liquid suction needle are inserted into the root canal.

[0021] Furthermore, in the root canal irrigation assembly of the present invention, it is preferred that a liquid outlet consisting of a lateral opening is provided at the needle tip of the irrigation needle.

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

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

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

[0025] (Effects of the Invention)

[0026] According to the present invention, flushing and negative pressure suction can be carried out simultaneously with an integrated structure. Specifically, when performing root canal flushing, there is no need for traditional negative pressure equipment with a main unit, a vacuum pump, etc., so the cost of root canal flushing equipment can be saved; on the other hand, when performing root canal flushing, by pushing the piston toward one side in the axial direction through the piston handle, the flushing liquid in the first chamber can be injected into the root canal of the tooth from the flushing needle. At the same time, the pressure in the second part of the closed first chamber and the second chamber is reduced, forming a negative pressure, so that the aspiration needle aspirates liquid from near the root apex, thereby achieving simultaneous injection and aspiration in the root canal. Moreover, by making the aspiration needle aspirate liquid from near the root apex, it is not only beneficial for fresh flushing liquid to enter the root apex area, but also beneficial for reducing the pressure near the root apex. Therefore, the root canal flushing effect and safety can be ensured, and the operational difficulty of root canal flushing can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A It is a side cross-sectional view schematically showing a root canal irrigation assembly according to an embodiment of the present invention.

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

[0029] Figure 2 The root canal irrigation assembly according to the present invention is schematically shown. Figure 1A The diagram when observing with arrow A in the figure.

[0030] Figure 3 The root canal irrigation assembly according to the embodiment of the present invention is schematically shown. Figure 1A The arrow in the diagram is when BB is observed.

[0031] Figure 4 The root canal irrigation assembly according to the embodiment of the present invention is schematically shown. Figure 1A The arrows in CC are observed in the figure.

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

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

[0034] (Explanation of symbols) 1 root canal irrigation assembly; 11 syringe; 111 syringe body; 1111 bottom wall; 1112 sidewall; 1113 nipple; 112 top cover; 1121 plate; 1122 Tubular part; 12 needles; 121 flushing needle; 1211 liquid outlet; 1212 pintle; 122 aspiration needle; 1221 hold segment; 1222 parallel segments; 1223 connecting segment; 1229 suction port; 13 pistons; 14 putter; 15 piston handle; 16 partitions; 17 locking element; 170 shaft; 171 first plate; 1711 Depression; 172 second plate; 1721 protrusion; 18. Sealing ring; 19 seals; C1 first chamber; C11 Part I; C12 Part II; C2 second chamber; L1 axially upward side; L2 is the other side of the axis. DETAILED DESCRIPTION

[0035] Next, combine Figures 1A to 6 A root canal irrigation assembly (also referred to as a root canal irrigation syringe assembly) according to an embodiment of the present invention will be described.

[0036] Here, for convenience of explanation, the extending direction of the axis of the syringe of the root canal irrigation assembly is referred to as the axial direction, the radial direction centered on the axis of the syringe is referred to as the radial direction, and one axial side is referred to as L1 and the other axial side is referred to as L2.

[0037] (Overall structure of the root canal irrigation assembly)

[0038] 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 from the end of the syringe 11 on one axial side L1 (the side away from the piston handle 15, i.e., the needle side) toward the other axial side L1. The piston 13 is disposed within the syringe 11. One end of the push rod 14 is connected to the piston 13, and the other end protrudes from the end of the syringe 11 on the other axial side L2 (the piston handle side) and is connected to the piston handle 15.

[0039] like Figure 1A As shown, the root canal irrigation assembly 1 further 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 within the first chamber C1 and axially divides the first chamber C1 into a first portion C11 and a second portion C12. The second portion C12 is axially closer to the other side L2 than the first portion C11. Only the second portion C12 of the first chamber C1 communicates with the second chamber C2, and the second portion C12 communicates with the second chamber C2 only on the other side L2 of the axial direction.

[0040] like Figure 1A As shown, the needle head 12 includes an irrigation needle 121 and a liquid aspiration needle 122. The irrigation needle 121 communicates with the first portion C11 of the first chamber C1. The liquid aspiration needle 122 communicates with the second chamber C2 and protrudes axially further to one side L1 than the irrigation needle 121. Furthermore, the liquid aspiration needle 122 is movable in the axial direction.

[0041] like Figure 1A As shown, the root canal irrigation assembly 1 further includes a locking member 17 , which can lock the axial position of the aspiration needle 122 relative to the irrigation needle 121 .

[0042] like Figure 1A As shown, a sealing ring 18 is provided at the portion of the syringe 11 through which the push rod 14 passes. The sealing ring 18 seals the inner cavity of the syringe 11 relative to the external space.

[0043] like Figure 1A As shown, a seal 19 is provided at a portion of the barrel 11 through which the pipetting needle 122 penetrates. The seal 19 seals the second chamber C2 from the external space.

[0044] (Structure of the syringe)

[0045] 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 is open on the other side L2 in the axial direction. The top cover 112 is assembled to the syringe body 111 in a detachable manner, closes the opening of the syringe body 111, and is penetrated by the push rod 14.

[0046] Here, if Figures 1A to 4 As shown, the syringe body 111 has a bottom wall 1111 and a side wall 1112. The bottom wall 1111 is circular when viewed in the axial direction. A central hole extending axially therethrough and a tubular nipple 1113 protruding axially toward one side L1 around the central hole are formed in the center of the bottom wall 1111. An outer peripheral hole extending axially therethrough is formed at a position radially outward of the bottom wall 1111 relative to the central hole, and the outer peripheral hole is for the pipette needle 122 to pass through. The side wall 1112 extends from the peripheral edge of the bottom wall 1111 toward the other side L2 in the axial direction. The side wall 1112 is cylindrical when viewed in the axial direction. An internal thread is formed on the inner surface of the other side L2 in the axial direction of the side wall 1112. The partition 16 extends from the bottom wall 1111 toward the other side L2 in the axial direction. The circumferential ends of the partition 16 are connected to the side wall 1112. The end of the other side L2 in the axial direction of the partition 16 maintains a certain distance from the end face of the one side L1 in the axial direction of the top cover 112, preferably 4-6 mm apart. That is, the end of the other side L2 in the axial direction of the second part C12 of the first chamber C1 is connected to the end of the other side L2 in the axial direction of the second chamber C2. When viewed in the axial direction, the central hole and the peripheral hole of the bottom wall 1111 are located on both sides of the partition 16. The partition 16 can be formed to be straight when viewed in the axial direction, or it can be formed to be arc-shaped when viewed in the axial direction. The seal 19 is provided at the end of the one side L1 in the axial direction of the second chamber C2 separated by the partition 16. The seal 19 is block-shaped, with a portion of its outer circumferential surface abutting the side wall 1112, the remaining portion abutting the partition 16, and the end surface of the seal 19 on one axial side L1 abutting the bottom wall 1111. Thus, the seal 19 prevents the pipette needle 122 from passing through it and reducing the airtightness of the second chamber C2 when moving back and forth.

[0047] In addition, if Figures 1A to 4 As shown, the top cover 112 has a plate-like portion 1121 and a cylindrical portion 1122. The plate-like portion 1121 extends in a plane perpendicular to the axial direction, and is elliptical when viewed in the axial direction, and is formed with a central hole in the center that penetrates in the axial direction for the push rod 14 to pass through. A sealing ring 18 is fixed to the center of the end face of the other axial side L2 of the plate-like portion 1121, for example, by bonding, so that when the piston handle 15 is pushed or pulled, a reliable seal of the inner cavity of the syringe 11 is achieved by the sealing ring 18. The cylindrical portion 1122 protrudes from the plate-like portion 1121 toward one axial side L1, and is circular when viewed in the axial direction. 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.

[0048] In addition, if Figure 1A As shown, the inner cavity of the syringe 11 is surrounded by the syringe body 111 and the top cover 112. The inner cavity of the syringe 11 is divided by the partition 16 to form a first chamber C1 and a second chamber C2. Figure 4 As shown, the cross-sectional area of ​​the first chamber C1 is preferably 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.

[0049] (Needle and its locking structure)

[0050] like Figure 1A As shown, the needle head 12 includes an irrigation needle 121 and a liquid suction needle 122. The irrigation needle 121 is connected to the first portion C11. The liquid suction needle 122 is connected to the second chamber C2 and protrudes further to the side L1 in the axial direction than the irrigation needle 121.

[0051] Here, if Figure 1AAs shown, the irrigation needle 121 is made, for example, of a metal alloy and has an overall straight shape. Its cross-section is a slender, cylindrical, thin-walled structure with a hollow interior for the flow of irrigation fluid. The irrigation needle 121 has a length of 28-32 mm, an outer diameter of 250-310 µm, and an inner diameter of 140-200 µm. The difference between the inner and outer diameters is preferably 110 µm. Preferably, the irrigation needle 121 is 30 mm long, with an outer diameter of 280 µm and an inner diameter of 170 µm. A liquid outlet 1211, consisting of a lateral opening, is provided at the tip of the irrigation needle 121. Under manual thrust, irrigation fluid flows out of the liquid outlet 1211, achieving root canal irrigation. The distance from the liquid outlet 1211 to the tip is 2-3 times, preferably 2.5 times, the outer diameter of the irrigation needle 121. The length (axial direction) of the liquid outlet 1211 is 3-5 times, preferably 4 times, the outer diameter of the irrigation needle 121. A pintle 1212 is provided at the tail end of the irrigation needle 121, i.e., the end on the other side L2 in the axial direction. By fitting the pintle 1212 over the nipple 1113, the irrigation needle 121 can be assembled to the syringe 11. A colored scale is provided on the surface of the irrigation needle 121 to indicate the depth of insertion of the irrigation needle 121 into the root canal. The color of the scale changes along the length (axial direction) of the irrigation needle 121. Preferably, Figure 1B As shown schematically, the flushing needle 121 maintains the original metal color 0-6 mm from the needle tip end, is red 6-9 mm from the needle tip end, orange 9-12 mm, green 12-15 mm, blue 15-18 mm, purple 18-21 mm, and white 21-24 mm.

[0052] In addition, if Figure 1AAs shown, the liquid-absorbing needle 122 is for example made of metal alloy, and the whole is curved shape, and its cross section is an elongated cylindrical thin-walled structure, and the internal hollow is used for the flow of flushing liquid. The length of the liquid-absorbing needle 122 is 60-70mm, the outer diameter is 250-310μm, and the inner diameter is 140-200μm, and the difference between the inner and outer diameters is preferably 110μm. Preferably, the length of the liquid-absorbing needle 122 is 65mm, the outer diameter is 280μm, and the inner diameter is 170μm. A liquid-absorbing port 1229 is provided at the needle tip of the liquid-absorbing needle 122. The tail end of the liquid-absorbing needle 122, i.e., the end of the other side L2 in the axial direction, passes through the peripheral hole of the bottom wall 1111 and extends in the second chamber C2. Specifically, the aspiration needle 122 includes: a retaining section 1221, which extends axially, and the other side L2 in the axial direction is located in the second chamber C2; a parallel section 1222, which is parallel to the flushing needle 121; and a connecting section 1223, which bends and extends from the retaining section 1221 to the parallel section 1222. The retaining section 1221 passes through the seal 19 in the axial direction. A liquid aspiration port is provided on one side L1 in the axial direction of the parallel section 1222. A liquid aspiration needle scale color band is provided on the surface of the liquid aspiration needle 122, and the color of the color band changes along the length direction (axial direction) of the liquid aspiration needle 122. Preferably, as Figure 1B As shown schematically, the aspiration needle 122 maintains its original metallic color 0-6 mm from the end of the needle tip, is red 6-9 mm, orange 9-12 mm, green 12-15 mm, blue 15-18 mm, purple 18-21 mm, and white 21-24 mm from the end of the needle tip. Preferably, the aspiration port 1229 is 0.2-0.7 mm from the end of the needle tip, more preferably 0.4 mm. The aspiration port 1229 is provided with at least one row (e.g., three rows), and each row of aspiration ports 1229 includes a plurality of holes spaced circumferentially (e.g., four small circular holes equally spaced circumferentially). The above-mentioned holes are used to absorb the irrigant at the root apex under negative pressure conditions and reduce the pressure near the root apex.

[0053] In addition, the tip of the aspiration needle 122 is closer to one side L1 in the axial direction than the tip of the flushing needle 121 , and the distance between the two in the axial direction is 1-5 mm, preferably 3 mm.

[0054] (Structure of piston, push rod and piston handle)

[0055] like Figure 1A As shown, the piston 13 is disposed in the first chamber C1.

[0056] Here, if 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, and the remaining portion abuts against the partition 16. Figure 4 As shown, the piston 13 has a shape in which a portion of the circular outer circumference is cut away when viewed in the axial direction.

[0057] like Figure 1A As shown, the push rod 14 passes through the top cover 112 .

[0058] Here, if 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 portion 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 outside the syringe 11. Figure 3 and Figure 4 As shown, the cross section of the push rod 14 is circular, 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.

[0059] like Figure 1A As shown, the center of the piston stem 15 is connected to the end portion of the other side L2 in the axial direction of the push rod 14. The piston stem 15 is assembled to the push rod 14 by threads or the like. Figure 2 As shown, the piston stem 15 is circular when viewed along the axial direction, but may also be formed into other shapes such as an ellipse.

[0060] (Structure of the locking member)

[0061] like Figure 1A As shown, the locking member 17 locks the flushing needle 121 and the aspiration needle 122 to each other.

[0062] Here, if Figure 1A As shown, the locking member 17 locks the parallel section 1222 of the aspiration needle 122 relative to the flushing needle 121. Preferably, the locking member 17 can be switched between a locked state and an unlocked state. In the locked state, the locking member 17 restricts the aspiration needle 122 from moving axially relative to the flushing needle 121. In the unlocked state, the locking member 17 allows the aspiration needle 122 to move axially 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. The flushing needle 121 and the aspiration needle 122 pass through the first and second plates 171, 172. The sides of the first and second plates 171, 172 opposite the shaft 170 can be engaged or disengaged (in the illustrated example, the first plate 171 is formed with a recess 1711, and the second plate 172 is formed with a protrusion 1721 that can fit into the recess 1711). When the locking member 17 is in the locked state, the first and second plates 171, 172 clamp the flushing needle 121 and the aspiration needle 122, and the friction between the first and second plates 171, 172 and the flushing needle 121, 122 restricts the aspiration needle 122 from axial movement relative to the flushing needle 121. To facilitate locking the flushing needle 121 and the aspiration needle 122, the roughness of the area where the locking member 17 is mounted on the flushing needle 121 and the aspiration needle 122 may be increased. Furthermore, the locking member 17 may be integrally formed from a resin or may be pre-fixed to one of the flushing needle 121 and the aspiration needle 122.

[0063] In addition, if Figure 1A As shown, two locking members 17 are provided along the length direction of the flushing needle 121 , but only one, or three or more, may also be provided.

[0064] (Example of assembling a root canal irrigation unit)

[0065] First, after one end of the push rod 14 is connected to the piston 13 , the piston 13 and the push rod 14 are pressed into (the first chamber C1 of) the syringe 11 .

[0066] Next, with the push rod 14 inserted through the top cover 112 , the top cover 112 is screwed to the end portion on the other axial side L2 of the syringe body 111 .

[0067] Next, the push rod 14 is screwed to the piston stem 15 .

[0068] Next, the irrigation needle 121 is connected to the nipple 1113 via the needle plug 1212 .

[0069] Next, the pipetting needle 122 is passed through the sealing member 19 and inserted into the second chamber C2.

[0070] Finally, the flushing needle 121 and the aspiration needle 122 are locked to each other using the locking member 17 .

[0071] Here, it is preferred that the sealing ring 18 is fixed to the top cover 112 before assembly, and the sealing member 19 is fixed to the bottom of the second chamber C2 before assembly.

[0072] (Use of root canal irrigation components)

[0073] First, measure the length of the root canal (specifically, obtain a 3D oral CBCT image and measure using computer visualization software to determine the distance from the root canal crown to the root apex, i.e., the root canal length). Determine the insertion depth of the aspiration needle 122 (for example, if the root canal is 15 mm long, the insertion depth range is 14.5-14.8 mm, ensuring that the tip of the aspiration needle 122 is 0.2-0.5 mm from the root apex). Mark the corresponding position on the scale band of the aspiration needle 122. This ensures that when inserting the aspiration needle 122, the needle tip is not too far from the root apex, which would affect the negative pressure aspiration effect at the root apex. Also, avoid inserting the needle tip too deeply, protruding from the apical foramen, and causing irrigation fluid to overflow into the periodontal tissue, causing damage and triggering pain, inflammation, and tissue necrosis.

[0074] Next, the locking member 17 is switched to the unlocked state, the front and rear positions of the flushing needle 121 and the aspiration needle 122 are adjusted, and then the locking member 17 is switched to the locked position for reliable locking.

[0075] Next, the first chamber C1 (first part C11) of the root canal flushing assembly 1 is filled with flushing liquid (specifically, first unscrew the top cover 112, then insert the needle 12 into the medicine bottle, push up the piston handle 15, and then screw on the top cover 112), inserted into the root canal, and then slowly push the piston handle 15 to move the piston 13 downward. 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, causing the aspiration needle 122 to aspirate liquid from the root apex, thereby achieving simultaneous injection and aspiration in the root canal.

[0076] When the second chamber C2 is full, the liquid in the second chamber C2 flows into the first chamber C1 (the second portion C12) through the connection between the first and second chambers C1 and C2. Once all the fresh flushing fluid in the first chamber C1 (the first portion C11) of the root canal flushing assembly 1 has been expelled, the entire root canal flushing assembly 1 is removed from the root canal. The flushing fluid drawn in from above the piston 13 and into the second chamber C2 can be expelled by pushing upward on the piston 13. (Alternatively, the top cover 112 can be unscrewed and the flushing fluid drawn in from above the piston 13 and into the second chamber C2 can be poured out.) The root canal flushing assembly 1 then draws fresh flushing fluid from the outside. Once the first chamber C1 is full, the above steps are repeated to continue root canal irrigation.

[0077] (Main Effects of This Embodiment)

[0078] According to the root canal irrigation assembly 1 of this embodiment, compared with the traditional irrigation needle that can only discharge liquid but cannot simultaneously suck back the irrigation waste liquid, debris, etc. near the root apex, it can more efficiently remove debris and bacteria problems in the root apex area, reduce the pressure in the root apex area, and improve the safety while improving the effectiveness of root canal irrigation. On the other hand, compared with an external dedicated negative pressure irrigation device, the equipment cost and clinical operation difficulty are greatly reduced.

[0079] In addition, according to the root canal irrigation assembly 1 of this embodiment, the irrigation needle 121 and the aspiration needle 122 both have scale color bands, which have good visualization effects, avoid the aspiration needle 122 from being inserted too deep or too shallow to affect the effect, and also make it easier to observe the front and back position relationship between the two.

[0080] In addition, according to the root canal irrigation assembly 1 of this embodiment, the relative positions of the irrigation needle 121 and the aspiration needle 122 can be freely adjusted at any time according to needs, and can be reliably locked by the locking member 17 after the adjustment is completed.

[0081] The present invention is described above by way of example with reference to the accompanying drawings. It is apparent that the specific implementation of the present invention is not limited to the above-mentioned embodiments.

[0082] For example, in the above embodiment, the cross section of the barrel body 111 is circular, but it may be formed in other shapes such as an ellipse.

[0083] Furthermore, in the above embodiment, the push rod 14 and the piston 13 are formed as separate bodies, but the present invention is not limited thereto, and the push rod 14 and the piston 13 may be formed as one body.

[0084] Furthermore, in the above embodiment, the partition 16 may be formed integrally with the syringe body 111 or may be formed separately from the syringe body 111 .

[0085] Furthermore, in the above embodiment, the colors of the scale bands of the flushing needle 121 and the pipetting needle 122 may be arranged in reverse except for the original metallic color portion.

[0086] Furthermore, in the above embodiment, scale lines may be provided on the flushing needle 121 and the aspiration needle 122 instead of the scale bands.

[0087] Furthermore, in the above embodiment, the push rod 14 and the flushing needle 121 may extend coaxially or may be staggered with each other.

[0088] It should be understood that within the scope of the present invention, various parts in the embodiments can be freely combined, or various parts in 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, wherein the needle extends from an end portion of the syringe on one axial side toward one axial side, the piston is disposed in the syringe, one end of the push rod is connected to the piston, and the other end protrudes from an end portion of the syringe on the other axial side and is connected to the piston handle, characterized in that: The syringe further comprises a partition extending in the axial direction and radially dividing the inner cavity of the syringe into a first chamber and a second chamber. The piston is disposed only in the first chamber and can axially divide the first chamber into a first portion and a second portion, wherein the second portion is located on the other side of the first portion in the axial direction, and only the second portion of the first chamber is in communication with the second chamber, and the second portion is in communication with the second chamber only on the other side in the axial direction. The needle head includes an irrigation needle and a liquid suction needle. The irrigation needle is communicated with the first portion, and the liquid suction needle is communicated with the second chamber and protrudes further to one side in the axial direction than the irrigation needle.

2. The root canal irrigation assembly according to claim 1, wherein: A cross-sectional area of ​​the first chamber is greater than a cross-sectional area of ​​the second chamber.

3. The root canal irrigation assembly according to claim 1, wherein: The pipette needle can move in the axial direction. The invention also includes a locking member capable of locking the axial position of the aspiration needle relative to the flushing needle.

4. The root canal irrigation assembly according to claim 3, wherein: The locking member can be switched 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 flushing needle. In the unlocked state, the locking member allows the pipetting needle to move axially relative to the irrigation needle.

5. The root canal irrigation assembly according to claim 3, wherein: The aspiration needle comprises: a retaining segment, the retaining segment extending in the axial direction, with the other side in the axial direction being located in the second chamber; a parallel section, the parallel section being parallel to the flushing needle; and A connecting section is provided, wherein the connecting section is bent and extends from the holding section to the parallel section.

6. The root canal irrigation assembly according to claim 5, wherein: A sealing member is provided at the portion of the syringe penetrated by the retaining section. The seal seals the second chamber from the outside.

7. The root canal irrigation assembly according to claim 1, wherein: The flushing needle and the liquid aspiration needle are respectively provided with marking portions indicating positions.

8. The root canal irrigation assembly according to claim 7, wherein: The marking portion of the flushing needle is a color band whose color changes along the length direction of the flushing needle. The marking portion of the pipette needle is a color band whose color changes along the length direction of the pipette needle.

9. The root canal irrigation assembly according to claim 1, wherein: The syringe comprises a syringe body and a top cover, The syringe body is in the shape of a bottomed cylinder and is open on the other side in the axial direction. The bottom of the syringe body is penetrated by the pipetting 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 member is provided at the portion of the syringe body through which the pipette needle penetrates. A sealing ring is provided on the portion of the top cover penetrated by the push rod.

10. The root canal irrigation assembly according to claim 1, wherein: A liquid outlet consisting of a side opening is provided at the needle tip of the flushing needle. At least one row of liquid suction ports is provided at the tip of the liquid suction needle. Each row of the liquid suction ports includes a plurality of holes spaced apart in the circumferential direction. The distance between the liquid aspiration port and the tip end of the liquid aspiration needle is 0.2-0.7 mm.

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