Dental handpiece and dental handpiece with cleaning adapter

Abstract

The dental handpiece and the dental handpiece with a cleaning joint of the present application can sufficiently clean the inside of the handpiece without disassembling the handpiece when cleaning before sterilization. The dental handpiece has: a cylindrical main housing; an insert-constituted body constituted to include an ultrasonic vibrator, the insert-constituted body being housed in the main housing in a manner to block a housing top end and a housing rear end of the main housing; a tip connecting portion provided at a top end portion of the insert-constituted body to connect a dental handpiece tip that transmits ultrasonic vibrations from the ultrasonic vibrator in a detachable manner; and a cleaning liquid flow path that guides cleaning liquid supplied from a cleaning liquid injection port provided at a rear end portion of the insert-constituted body to a housing top end portion of the main housing. The cleaning liquid flow path has a housing-internal immersion flow path that immerses the insert-constituted body in the cleaning liquid in the main housing and causes the cleaning liquid in which the insert-constituted body is immersed to be discharged from the housing top end portion.

Description

TECHNICAL FIELD

[0001] The present application relates to a dental handpiece and a dental handpiece with an adapter for supplying a cleaning liquid to the dental handpiece. BACKGROUND

[0002] A dental handpiece that removes dental plaque and the like using ultrasonic waves is known (see, for example, Patent Literature 1). The dental handpiece shown in Patent Literature 1 is configured to include an ultrasonic vibrator, a sterilizing liquid flow path, a glass rod that becomes a light path for irradiating light from a light source to a treatment site, and the like, and a scaler tip is attached to the tip end of the handpiece when treating a patient.

[0003] For such a dental handpiece, when performing a cleaning treatment such as dental plaque removal on a patient, proteins and the like contained in blood or saliva sometimes splash into a gap and the like of the glass rod disposed near the tip holder portion inside the handpiece and remain there. Such residues are disposed of during cleaning, sterilization, and disinfection of the dental handpiece after treatment.

[0004] However, during the above-described cleaning, sterilization, and disinfection, a part of the dental handpiece needs to be disassembled to make it easy to dispose of the residues inside the handpiece, and the work is complicated.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2012-235979 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] Therefore, an object of the present application is to provide a dental handpiece and a dental handpiece with an adapter that can sufficiently clean the inside of the handpiece without disassembly work at the time of cleaning.

[0010] SOLUTION TO PROBLEM

[0011] The present application is formed of the following configuration.

[0012] (1) A dental handpiece comprising:

[0013] a cylindrical main body case;

[0014] an insert-constituting body configured to include an ultrasonic vibrator, the insert-constituting body being housed in the main body case in a manner that a tip end portion plugs a case tip end of the main body case and a rear end portion plugs a case rear end of the main body case;

[0015] A pointed connecting portion is provided at the top end of the insert assembly, for removable connection to a dental scaler tip that transmits ultrasonic vibrations from the ultrasonic transducer; and

[0016] The cleaning fluid flow path guides the cleaning fluid supplied from the cleaning fluid injection port located at the rear end of the insert assembly to the top end of the main body housing.

[0017] The cleaning fluid flow path has an internal immersion flow path, which immerses the insert component in the cleaning fluid within the main body housing and discharges the cleaning fluid that has immersed the insert component from the top of the housing.

[0018] (2) A dental handpiece with a cleaning connector, comprising:

[0019] Dental handpieces as described in (1); and

[0020] The cleaning connector is detachably connected to the rear end of the dental handpiece, and the cleaning fluid supplied from an external device is injected into the immersion flow path inside the housing and the water injection flow path on the main body side.

[0021] Invention Effects

[0022] According to the present invention, the internal components of a mobile phone can be thoroughly cleaned without decomposition during the pre-sterilization cleaning process. Attached Figure Description

[0023] Figure 1 This is a side view showing the appearance of a dental handpiece with a scaler tip and a cleaning connector attached.

[0024] Figure 2 This is a schematic side view of the insert component.

[0025] Figure 3 It is a schematic exploded three-dimensional diagram of the insert component.

[0026] Figure 4 It is along Figure 2 A schematic cross-sectional view of line IV-IV.

[0027] Figure 5 It is along Figure 2 A schematic cross-sectional view of the V-V line.

[0028] Figure 6 This is an end view of the rear side of a dental handpiece.

[0029] Figure 7 This is an end view of the top side of a dental handpiece.

[0030] Figure 8is an explanatory view schematically showing the internal configuration of the dental handpiece and the flow path of the cleaning liquid.

[0031] Figure 9A is a schematic perspective view showing the flow path of the cleaning liquid formed in the connecting portion.

[0032] Figure 9B is a schematic perspective view showing the flow path of the cleaning liquid formed in the connecting portion.

[0033] Figure 10A is a schematic perspective view of one of the ferrule half bodies of the rear end side ferrule.

[0034] Figure 10B is a schematic perspective view of the other of the ferrule half bodies of the rear end side ferrule.

[0035] Figure 11 is a schematic perspective view of the rear end side ferrule after the ferrule half bodies are combined.

[0036] Figure 12A is a schematic perspective view of the top end side ferrule as viewed from the top end side.

[0037] Figure 12B is a schematic perspective view of the top end side ferrule as viewed from the rear end side.

[0038] Figure 13 is an explanatory view showing the flow of the cleaning liquid in the top end side ferrule.

[0039] Figure 14 is a sectional view showing the cleaning adapter of the first configuration example.

[0040] Figure 15 is Figure 14 an exploded view of the cleaning adapter shown in Fig.

[0041] Figure 16 is a partial sectional perspective view showing the state of connection of the cleaning adapter to the dental handpiece.

[0042] Figure 17 is an end view of the top end side of the cleaning adapter.

[0043] Figure 18 is an explanatory view showing the case where the cleaning adapter is connected to the nozzle of the spray can.

[0044] Figure 19 is an explanatory view showing the case where the cleaning adapter is connected to the handpiece holder of the hot water cleaner.

[0045] Figure 20 is a sectional view showing the configuration of the cleaning adapter connected to the autoclave device dedicated to the handpiece.

[0046] BRIEF DESCRIPTION OF REFERENCE NUMERALS:

[0047] 11: main body housing; 13: dental handpiece tip; 15: insert-constituted body; 17: ultrasonic vibrator; 19: tip connecting portion; 21: connecting portion; 21a: bottomed recess; 23: housing portion; 25: glass rod; 27: ultrasonic vibration source; 28: front end portion; 29: rear end portion; 30: connecting flow path; 31: top end side collar; 33: rear end side collar; 33A, 33B: collar halves; 35: engaging portion; 35A: claw portion; 35B: receiving portion; 37: connecting member; 39: vibrating body; 41: center connecting port; 43: main body side water injection flow path; 45: elastic cover; 47: electrode terminal; 49: cleaning liquid injection port; 51: glass rod rear end holding portion; 55: through hole; 57: through hole; 59: protrusion; 61: glass rod holding portion; 63: notch portion; 65: through hole; 71: large diameter portion; 73: small diameter portion; 75: notch; 77, 79: opening hole; 81: flange portion; 83: edge portion; 85: glass rod top end holding portion; 85a: top end edge; 87: slit groove; 91, 93, 95: discharge port; 100: dental handpiece; 111: connecting member main body; 113: water injection flow path connecting portion; 115: cleaning device connecting portion; 117: recess; 119: flange portion; 121: external thread; 123: through hole; 125: peripheral hole; 127: internal thread; 129: counterbore portion; 131: external thread; 133: connecting end; 134: through hole; 135: recess; 136: thin-walled flexible spring; 137: flange portion; 138: O-ring; 139: internal thread; 141: shaft portion; 143: through hole; 145: internal thread; 147: counterbore portion; 151: liquid injection side storage portion; 153: liquid delivery side storage portion; 161: spray can; 163: nozzle attachment; 165: external thread; 167: handpiece holder; 169: holder recess; 171: cleaning liquid supply port; 173: connecting member main body; 175: groove portion; 177: base; 179A, 179B: injection hole; 183: plug body; 200: cleaning adapter. DETAILED DESCRIPTION

[0048] Hereinafter, an embodiment of the dental handpiece of the present application will be described in detail with reference to the drawings.

[0049] Figure 1 is a side view showing the appearance of the dental handpiece 100 to which the dental handpiece tip 13 and the cleaning adapter 200 are connected.

[0050] The dental handpiece 100 has a cylindrical main body housing 11. The dental handpiece tip 13 is connected to the top end portion of the main body housing 11 in a detachable manner, and the cleaning adapter 200, which will be described later in detail, is connected to the rear end portion of the main body housing 11.

[0051] In the present specification, the connection side of the dental handpiece 100 of the dental scaler 13 is set as "forward", "top end side", "front", the connection side of the cleaning connector 200 is set as "rear", "rear end side", and the long dimension direction of the dental handpiece 100 is set as "axial direction" and described.

[0052] <Configuration of Dental Handpiece>

[0053] Figure 2 is a schematic side view of the insert structure 15.

[0054] The insert structure 15 is housed inside the main body case 11 of the dental handpiece 100. Figure 3 is a schematic exploded perspective view of the insert structure 15. The shapes of the components shown here are only one example for describing the embodiment and are not limited thereto.

[0055] As shown in Figure 2 , the insert structure 15 is provided with an ultrasonic transducer 17 and a tip connection portion 19 at the top end portion, and a cleaning liquid injection port described later at the rear end portion. In the present configuration, the cleaning liquid injection port is provided at a connection portion 21 of the insert structure 15, which is connected to a hose or a cleaning device connected to a not-shown handpiece control device. The top end portion of the insert structure 15 plugs the top end of the main body case 11, and the rear end portion of the insert structure 15 plugs the rear end of the main body case 11, whereby the insert structure 15 seals the inside space of the main body case 11. Further, a housing portion 23 covering the top end side and the rear end side of the ultrasonic transducer 17 is provided outside the ultrasonic transducer 17. A pair of glass rods 25 Figure 2 is shown by a broken line only on the front side) is arranged outside the housing portion 23 along the axial direction of the insert structure 15. The glass rods 25 guide light such as laser light supplied from a not-shown light connector connected to the connection portion 21 to the top end portion of the insert structure 15. Note that the dental handpiece 100 can also be a configuration not provided with the glass rods 25.

[0056] As shown in Figure 3 , the ultrasonic transducer 17 is provided with an ultrasonic vibration source 27 generating ultrasonic vibration, a front horn 28, and a rear horn 29. The front horn 28 is connected to the top end side of the ultrasonic vibration source 27, and is a vibration transmission member that transmits the generated ultrasonic vibration to the dental scaler 13 Figure 1 , the tip of which is the tip connection portion 19. The rear horn 29 is connected to the rear end side of the ultrasonic vibration source 27.

[0057] The housing portion 23 includes: a top-side collar 31 covering the area between the ultrasonic vibration source 27 and the top of the front amplitude transformer 28; and a rear-side collar 33 covering the area between the ultrasonic vibration source 27 and the rear end of the rear amplitude transformer 29. The rear-side collar 33 is preferably composed of a pair of semi-segmented cylindrical collar halves 33A and 33B. In this case, the pair of collar halves 33A and 33B have engaging portions 35 that engage with each other when assembled. The engaging portions 35 combine the collar halves 33A and 33B into one unit by engaging a claw portion 35A provided on one of the collar halves 33A and 33B with a receiving portion 35B provided on the other. It should be noted that the collar halves 33A and 33B have the same shape, and the claw portion 35A and the receiving portion 35B engage with their corresponding receiving portions 35B and claw portions 35A, respectively. In addition, it is not limited to only the rear end side collar 33 being semi-segmented cylindrical; the top end side collar 31 may also be semi-segmented cylindrical, or both sides may be semi-segmented cylindrical.

[0058] Figure 4 It is along Figure 2 A schematic cross-sectional view of line IV-IV. Figure 5 It is along Figure 2 A schematic cross-sectional view of the V-V line (IV-IV line and V-V line are also described later). Figure 6 In the following description, the description of the same components or parts is simplified or omitted by assigning the same reference numerals to them.

[0059] like Figure 4 , Figure 5 As shown, the front amplitude transformer 28 and the rear amplitude transformer 29 of the ultrasonic transducer 17 are connected by a connecting member 37, and a vibrating body 39 is arranged on the outer periphery of the connecting member 37. The front amplitude transformer 28, the connecting member 37, and the rear amplitude transformer 29 each have through holes 28a, 37a, and 29a that extend along the axial direction. A main body side water injection path 43 is formed through these through holes 28a, 37a, and 29a and a connecting flow path 30 that connects the central connection port 41 of the connecting part 21 to the rear amplitude transformer 29. The main body side water injection path 43 is formed as the central axis of the insert component 15 that extends from the central connection port 41 to the pointed connecting part 19, and is used to deliver water to the affected area during patient treatment.

[0060] The outer periphery of the ultrasonic vibration source 27 is covered by an elastic cover 45, such as silicone rubber, which has insulating and chemical-resistant properties, in a liquid-impermeable manner. It should be noted that the vibrator 39 is connected to... Figure 5 The electrode terminal 47 shown is connected to a cable (not shown).

[0061] Figure 6 This is an end view of the rear side of a dental handpiece 100.

[0062] likeFigure 6 As shown, a center joint port 41 is provided at the center axis of the connecting portion 21. Liquid supply from the center joint port 41 to the body-side water injection flow path 43 is possible. In addition, a pair of electrode terminals 47 is provided in the bottomed recess 21a of the connecting portion 21. The tip end portions of the pair of glass rods 25 are fixed to the connecting portion 21 in a manner so as to be disposed on both sides of the center joint port 41.

[0063] The circumferential gap between the glass rod 25 and the bottomed recess 21a in the connecting portion 21 is a cleaning liquid injection port 49 (indicated by a hatched portion) for injecting cleaning liquid as described later. The rear end of the body case 11 communicates only the cleaning liquid injection port 49 of the connecting portion 21 with the inside of the body case 11, and the other portions are in airtight and watertight structure. That is, gas and liquid do not intrude into the inside of the body case 11 from portions other than the cleaning liquid injection port 49. Figure 6

[0064] Figure 7 is an end surface view of the tip end side of the dental handpiece 100.

[0065] As shown, a discharge port 91 of the body-side water injection flow path 43 is provided in the center of the tip portion 19. The light emission end of the pair of glass rods 25 is fixed to the tip side collar 31 on the outside of the tip portion 19. In addition, the annular gap between the tip portion 19 and the tip side collar 31 is a discharge port 93 of cleaning liquid as described later in detail, and the circular arc-shaped gap between the glass rod 25 and the tip side collar 31 is a discharge port 95 of cleaning liquid as described later in detail. Note that, in the case where the dental handpiece 100 does not have the glass rod 25, the light emission end of the tip side collar 31 is sealed together with the discharge port 95, and cleaning liquid is discharged from the discharge ports 91 and 93. Figure 7

[0066] <Cleaning liquid flow path>

[0067] Next, the flow path of the cleaning liquid that cleans the inside of the dental handpiece 100 having the above-described configuration is described.

[0068] Figure 8 is an explanatory view that schematically shows the internal structure of the dental handpiece 100 and the flow path of the cleaning liquid.

[0069] As shown, the flow path of the cleaning liquid that is supplied from the connecting portion 21 into the handpiece is a central flow path FC that is supplied from the center joint port 41 and a peripheral flow path FS that is supplied from the cleaning liquid injection port 49. The cleaning liquid that is supplied to the central flow path FC is supplied from the center joint port 41 to the tip portion 19 via the body-side water injection flow path 43. Thereby, the body-side water injection flow path 43 is cleaned. Figure 8

[0070] ​​​The cleaning liquid supplied to the peripheral flow path FS forms an inside housing immersion flow path that immerses the insert constituent body 15 in the cleaning liquid inside the main body housing 11 and discharges the cleaning liquid in which the insert constituent body 15 is immersed from the top end portion of the housing. The peripheral flow path FS is divided into an inside flow path FS that passes through the center side of the center connecting port 41 and an outside flow path FS that passes through the main body housing 11 side halfway through the connecting portion 21. r1 r2 .

[0071] Figure 9A 、 Figure 9B is a schematic perspective view showing the flow path of the cleaning liquid formed in the connecting portion 21. In Figure 9A 、 Figure 9B , a portion of the flow path of the cleaning liquid supplied from the pair of cleaning liquid injection ports 49 is shown as a substitute.

[0072] As shown in Figure 9A 、 Figure 9B , the cleaning liquid supplied from the cleaning liquid injection port 49 is stirred by the concave-convex formed by the glass rod 25 and the glass rod rear end holding portion 51 that fixes the glass rod 25 by a snap fit configuration, and flows to the front side of the flow path. The connecting portion 21 is connected to the rear end side collar 33 inside the main body housing 11 shown in Figure 8 r1 and the outside flow path FS r2 extend along the axial direction of the rear end side collar 33 to the top end side, respectively, and become the inside flow path FS t1 and the outside flow path FS t2 described later. The connecting portion 21 is configured to be separate from the rear end side collar 33, but is not limited thereto and can be configured to be integral with the rear end side collar 33.

[0073] Figure 10A is a schematic perspective view of one collar half 33A of the rear end side collar 33. Figure 10B is a schematic perspective view of the other collar half 33B of the rear end side collar 33.

[0074] As shown in Figure 10A 、 Figure 10B , the pair of collar halves 33A and 33B that constitute the rear end side collar 33 have a plurality of claw portions 35A and receiving portions 35B that engage with each other. The claw portion 35A is a tab in a state of being cut by a slit formed in the collar halves 33A and 33B or a tab in a state of being formed to protrude from a portion of the collar halves 33A and 33B.

[0075] ​​The slit formed around the claw portion 35A in the dug state is a through-hole 55 that penetrates the collar half 33A, 33B in the thickness direction. Further, a through-hole 57 for inserting the tip portion of the claw portion 35A is formed in the receiving portion 35B. Furthermore, a convex portion 59 such as a rib that protrudes in the thickness direction and various groove portions that are recessed in the thickness direction are formed in the outer peripheral surface of the collar half 33A, 33B. Also, a glass rod holding portion 61 that fixes the glass rod by a snap fit configuration, a notch portion 63, and a through-hole 65 formed around the glass rod holding portion 61 are formed. In this way, the rear end side collar 33 is formed with the plurality of through-holes 55, 57, 65, the convex portion 59, the notch portion 63, and the recesses such as grooves.

[0076] In Figure 8 the region of the rear end side collar 33 shown in FIG. 8, the cleaning liquid flows toward the tip end side along the inner side flow path FS t1 and the outer side flow path FS t2 , where the inner side flow path FS t1 flows through the inner peripheral side of the rear end side collar 33, and the outer side flow path FS t2 passes between the outer peripheral side of the rear end side collar 33 and the main body housing 11.

[0077] Figure 11 is an overall perspective view of the rear end side collar 33 after the collar halves 33A, 33B are combined.

[0078] In the middle of the region where the cleaning liquid passes through the rear end side collar 33, as shown by the arrows in Figure 11 , the cleaning liquid passes through the through-holes formed in the rear end side collar 33 from the inner side flow path FS t1 to the outer side flow path FS t2 or from the outer side flow path FS t2 to the inner side flow path FS t1 , promoting the diffusion of the cleaning liquid. Further, by the concave-convex portions formed in the rear end side collar 33, the stirring effect of the cleaning liquid can be improved.

[0079] Even in the case where the glass rod 25 shown by the dashed line in Figure 11 is assembled, the cleaning liquid is stirred while changing the flow direction in the gap between the glass rod 25 and the rear end side collar 33, and the gap between the rear end side collar 33 and the inner peripheral surface of the main body housing 11, which is not shown.

[0080] The cleaning liquid that has flowed through the inner side flow path FS t1 is guided toward the outer side flow path FS t2 as shown by the arrow FS t at the connection end side of the rear end side collar 33 to the ultrasonic vibration source 27. Then, the cleaning liquid from the inner side flow path FS t1The cleaning fluid and the FS from the outer flow path t2 The combined cleaning fluids flow through the outside of the ultrasonic vibration source 27, that is, through... Figure 8 The flow path FS on the outer side of the elastic cover 45 shown v And the top side collar 31.

[0081] Figure 12A This is a schematic three-dimensional view of the top-side collar 31 as viewed from the top side. Figure 12B This is a schematic three-dimensional view of the top side collar 31 as viewed from the rear end.

[0082] The top-side collar 31 has a large-diameter portion 71 at the rear end and a small-diameter portion 73 extending from the large-diameter portion 71 towards the top end. Approximately half of the circumferential portion 71 is formed into a cylindrical shape, and the remaining approximately half is formed into a pair of notches 75 for accommodating a glass rod 25 (not shown). The pair of notches 75 are formed in a radially opposing manner. Openings 77 and 79 communicating with the inner space of the cylindrical large-diameter portion 71 are formed at the bottom of the radially inner side of the notches 75. A flange portion 81 opposing the ultrasonic vibration source 27 is provided at the rear end of the large-diameter portion 71, and an edge portion 83 abutting against the inner circumferential surface of the main body housing 11 is provided at the top end of the large-diameter portion 71. Furthermore, as... Figure 12B As shown, a slit groove 87 along the axial direction is formed on the inner circumferential surface of the cylindrical large-diameter portion 71.

[0083] The small-diameter portion 73 is a generally cylindrical multi-segment shape that narrows towards the top. At its top end, corresponding to a pair of notches 75, there is a glass rod top retaining portion 85 that secures the glass rod 25 by means of a snap-fit ​​mechanism. The glass rod top retaining portion 85 is configured to protrude radially outward from the outer peripheral surface of the small-diameter portion 73 and contact the inner peripheral surface of the main body housing 11 (not shown).

[0084] Top side collar 31 Figure 8 The flow path narrowing section A, which forms the outer flow path between the flange portion 81 and the edge portion 83, has a gradually decreasing cross-sectional area. S In the flow path reduction section A S In the process, the cleaning fluid flowing through the outer flow path is divided into the inner flow path and the outer flow path of the top side collar 31.

[0085] like Figure 12A As shown, the flow path FS from the outer side reaches the top side collar 31. v The cleaning fluid flows along the FS path wa and flow path FS wb Flow, the flow path FS wa The flow path FS flows forward past the flange 81. wb The glass rod 25 (not shown) is clamped by the notch 75 and flows forward from the gap between the top side collar 31 and the main body shell 11.

[0086] Figure 13 This is an explanatory diagram showing the flow of cleaning fluid in the top side collar 31.

[0087] Flow path FS wb The flow is mainly divided into: flow path FS wc The flow path FS flows into the inner side of the top-side collar 31 from the opening 79 of the notch 75 in the large-diameter portion 71; wd The water flows into the inner side of the top-side collar 31 from the opening 77; and the flow path FS we It passes through openings 77 and 79 and faces outwards towards the small diameter portion 73. Flow path FS wc The cleaning fluid along one side Figure 12B The slit groove 87 shown is rectified, flowing forward through the inner side of the top-side collar 31. Furthermore, the flow path FS... wd The cleaning fluid is also inside the top side collar 31 and the flow path FS. wc They converge and flow forward.

[0088] On the other hand, in the flow path FS wa In the middle, the outer flow path is blocked by the edge portion 83 of the large diameter portion 71, thus becoming the flow path FS from the notch 75 toward the outer periphery of the small diameter portion 73. wf , and flow path FS we They converge and flow through the outer side of the top side ring 31.

[0089] The connection between the small-diameter portion 73 and the large-diameter portion 71 is tapered in shape, with the outer diameter gradually decreasing. Thus, as... Figure 8 As shown, the outer flow path from the edge portion 83 to the front becomes a flow path expansion portion A with a gradually increasing cross-sectional area. E In the flow path expansion section A E In the middle, the flow path width expands after being narrowed by the edge portion 83, thus increasing the change in the flow direction and velocity of the cleaning fluid and promoting the agitation of the cleaning fluid.

[0090] And, as Figure 12A As shown, at the top end of the top-side collar 31, the cross-sectional area of ​​the outer flow path is reduced by the glass rod top holding portion 85. The top edge 85a of the glass rod top holding portion 85 contacts the inner circumferential surface of the main body housing 11, thereby blocking a portion of the circumferential direction of the outer flow path. Thus, the flow of the cleaning fluid is concentrated in the glass rod top holding portion 85. In this way, compared to... Figure 8 The flow path expansion section A shown E The position near the top becomes the further shrinking section A, where the cross-sectional area of ​​the outer flow path gradually decreases again. RS Further reduction of part A RS The outer flow path restriction section is for the passage through the re-shrinkage section A. RSpart of the cleaning liquid in the outer flow path is restricted. By this, the cleaning liquid is stirred by turbulence and discharged from the discharge port of the outer flow path. Further, the inner flow path of the tip-side collar 31 is connected to the periphery of the tip connection portion 19 of the front amplitude rod 28 through the outer periphery of the tip-side collar 31 and the inner periphery of the front amplitude rod 28.

[0091] As a result, in the dental handpiece 100 shown in Figure 7 The tip of the dental handpiece 100 shown in Fig. 1 is provided with a discharge port 91 of the main body-side water injection flow path 43 which opens in the center of the tip connection portion 19, a discharge port 93 of the inner flow path which is an annular gap between the outer periphery of the tip connection portion 19 and the inner periphery of the tip-side collar 31, and a discharge port 95 of the outer flow path which is a circular arc-shaped gap between the radially outer side of the glass rod 25 and the main body housing 11. From the central flow path FC, the cleaning liquid is discharged from the discharge port 91, and from the peripheral flow path FS, the cleaning liquid is discharged from the discharge ports 93 and 95. Figure 8 The cleaning liquid supplied from the central flow path FC is discharged from the discharge port 91, and the cleaning liquid supplied from the peripheral flow path FS is discharged from the discharge ports 93 and 95.

[0092] That is, the cleaning liquid supplied from the connection portion 21 to the center connection port 41 in the central flow path FC cleans the main body-side water injection flow path 43 and is discharged from the discharge port 91. Further, the cleaning liquid supplied from the connection portion 21 to the cleaning liquid injection port 49 in the peripheral flow path FS flows through the inner and outer peripheral sides of the rear-side collar 33 between the inner periphery of the main body housing 11 and the outer periphery of the ultrasonic vibrator 17, passes the outside of the ultrasonic vibration source 27, flows through the inner and outer peripheral sides of the tip-side collar 31, and is discharged from the discharge ports 93 and 95.

[0093] Thus, in the peripheral flow path FS, the insert-constituting body 15 disposed inside the dental handpiece 100 is soaked in the cleaning liquid, and the cleaning liquid in which the insert-constituting body 15 is soaked is discharged from the discharge ports 93 and 95. Therefore, even if the dental handpiece 100 is used for treatment of a patient and generates residue due to invasion of foreign matter or the like into the handpiece, the residue can be reliably treated by causing the cleaning liquid to flow through the inside of the handpiece during cleaning of the dental handpiece 100. Also, in the case where the insert-constituting body 15 has an electrical component built therein, the cleaning liquid can be used to flush foreign matter such as dust or the like adhered due to static electricity or the like.

[0094] Generally, residue tends to adhere to narrow gaps, making reliable removal difficult using conventional methods of cleaning from the outside of the dental handpiece, requiring disassembly and cleaning. However, the dental handpiece 100 with the above-described configuration allows for easy cleaning of the inside of the handpiece without disassembly. In other words, by filling the inside of the handpiece with cleaning fluid, the insert component 15 is immersed in the cleaning fluid, causing dirt adhering to the insert component 15 to float up. Then, by draining the cleaning fluid that has soaked the insert component 15, the floated dirt is removed. Furthermore, the cleaning fluid is agitated within the handpiece by various protrusions, through-holes, etc., flowing through the inside of the handpiece to the corners, thus improving the cleaning effect due to the force of the fluid flow. Specifically, the inside of the handpiece, in addition to utilizing numerous through-holes, protrusions, and grooves in various parts of the insert component 15, also utilizes numerous snap-fit ​​components (claws, receiving parts) with a protrusion-contact structure. This changes the flow direction and flow path cross-sectional area of ​​the cleaning fluid, ensuring thorough agitation without clogging. As a result, the residue removal efficiency achieved by the cleaning fluid is improved.

[0095] Furthermore, in the dental handpiece 100, the cleaning fluid flows in one direction, thus the drainage of the cleaning fluid from the inside of the handpiece to the outside becomes smooth, and it is less likely to cause fluid accumulation inside the handpiece.

[0096] Furthermore, the ultrasonic vibration source 27, which is an electrical component located inside the phone, is covered by an elastic cover 45 in a liquid-impermeable manner, preventing water from seeping into the interior of the electrical component. Moreover, the elastic cover 45 is insulating and chemical-resistant, thereby protecting the electrical component from damage during the cleaning process. Therefore, even if the inside of the phone is filled with cleaning fluid, it will not affect the electrical component.

[0097] Based on the above configuration, a high level of cleaning effect can be achieved without complicating the cleaning process, and the criteria for cleaning dental handpieces stipulated in various countries can be reliably met.

[0098] <Cleaning Connector>

[0099] Next, the cleaning connector 200 will be described.

[0100] Cleaning connector 200 Figure 1 The device connects to the rear end of the dental handpiece 100 as shown, and supplies cleaning fluid to the dental handpiece 100. Generally, various external devices for cleaning and disinfecting handpieces, i.e., cleaning equipment, are provided in a manner that allows connection to the dental handpiece 100. The user of the dental handpiece connects the dental handpiece to the cleaning equipment via a cleaning connector corresponding to the dental handpiece for cleaning and disinfection.

[0101] (First configuration example of the cleaning adapter)

[0102] Figure 14 is a cross-sectional view of the cleaning adapter 200 of the first configuration example. Figure 15 is Figure 14 is an exploded view of the cleaning adapter 200. Figure 16 is a partial cross-sectional perspective view showing the connection state of the cleaning adapter 200 and the dental handpiece 100. Figure 17 is an end face view of the tip end side of the cleaning adapter 200.

[0103] As shown in Figure 14 , Figure 15 , the cleaning adapter 200 has a connector main body 111, a water injection flow path connecting portion 113, and a cleaning device connecting portion 115. As shown in Figure 16 , the connector main body 111 has a flange portion 119 that forms a recessed portion 117 on the tip end side. The flange portion 119 is fitted to the outer peripheral surface of the connecting portion 21 to be connected to the dental handpiece 100. Further, an external thread 121 that fixes the cleaning device connecting portion 115 is formed on the outer peripheral surface of the rear end side of the connector main body 111. Moreover, the connector main body 111 is formed with a through-hole 123 along the center axis Lc, and a plurality of peripheral holes 125 are formed on the radially outer side of the through-hole 123. An internal thread 127 is formed on the inner peripheral surface of the through-hole 123. Further, a counterbore portion 129 having a smaller diameter than the inner peripheral surface of the flange portion 119 is formed on the bottom surface of the recessed portion 117, and the plurality of peripheral holes 125 are opened in the counterbore portion 129. Figure 14

[0104] As shown in Figure 17 , the plurality of peripheral holes 125 are provided, for example, at four places at equal intervals along the circumferential direction, but the number is not limited thereto.

[0105] The water injection flow path connecting portion 113 is disposed on the center axis Lc of the connector main body 111 as shown in Figure 14 , and an external thread 131 formed on the rear end side is fastened to the internal thread 127 of the connector main body 111. Further, the connecting end 133 of the tip end side of the water injection flow path connecting portion 113 protrudes from the bottom surface of the recessed portion 117 and is connected to the center joint 41 (refer to Figure 16 ) of the dental handpiece 100. The water injection flow path connecting portion 113 is formed with a through-hole 134 that penetrates along the axial direction.

[0106] ​Multiple thin-walled flexible springs 136, formed by dividing the thin-walled cylindrical body through axial slits, are provided on the outer periphery of the connecting end 133. The thin-walled flexible springs 136, through their own elasticity, press and clamp the thin-walled cylindrical body from the outside to the inside, inserting it into the central connection port 41 of the connecting end 133. These thin-walled flexible springs 136 improve the sealing between the connecting end 133 and the central connection port 41. Furthermore, an O-ring 138 is disposed on the outer peripheral surface of the top end of the connecting end 133. The O-ring 138 presses against the inner peripheral surface of the central connection port 41 to improve liquid impermeability. Moreover, it generates a frictional force in the insertion / removal direction towards the central connection port 41. This frictional force prevents the dental handpiece 100 from dislodging during cleaning due to the pressure of the cleaning fluid. Thus, the connection structure between the water flow path connection 113 and the central connection port 41 can withstand the internal pressure of the cleaning fluid and provides more stable retention of the dental handpiece 100.

[0107] like Figure 15 As shown, the cleaning device connection portion 115 has a flange portion 137 forming a recess 135 on its top side. A fastening mechanism is formed on the inner circumferential surface of the flange portion 137. Figure 14 The connecting body 111 shown has an external thread 121 and an internal thread 139. A shaft portion 141 for connecting to the cleaning equipment is provided at the rear end of the cleaning equipment connecting portion 115. A through hole 143 is provided in the shaft portion 141 along the central axis Lc, and an internal thread 145 is formed on the inner circumferential surface of the through hole 143. Furthermore, a countersunk hole portion 147 is formed between the recess 135 and the through hole 143.

[0108] In the cleaning connector 200 constructed as described above, such as Figure 14 As shown, a space for a liquid injection-side storage section 151 is defined between the countersunk portion 147, which communicates with the through hole 143, and the connector body 111 on the rear end side. The rear ends of the plurality of peripheral holes 125 and the rear ends of the through hole 134 of the water flow path connection portion 113 open together into the liquid injection-side storage section 151. Furthermore, a countersunk portion 129 communicating with the plurality of peripheral holes 125 is formed on the connection side of the connector body 111 with the connection portion 21. A liquid delivery-side storage section 153 is defined between the countersunk portion 129 and the connection portion 21. It should be noted that the liquid delivery-side storage section 153 does not communicate with the through hole 134 of the water flow path connection portion 113.

[0109] (Connection to cleaning equipment)

[0110] Next, the flow of cleaning fluid will be explained when the cleaning connector 200 configured above is connected to the cleaning equipment.

[0111] As a connection method with the cleaning device, for example, the following methods can be listed as shown below.(1) A method of connecting the cleaning adapter 200 to a nozzle of a spray tank (for example, WL-clean manufactured by ALPRO MEDICAL GmbH) that stores a cleaning liquid (sometimes also a sterilizing liquid, dry air) or a nozzle of a spray gun that sprays a cleaning liquid.(2) A method of connecting the cleaning adapter 200 to a cell phone holder that holds a cell phone and supplies a cleaning liquid to the inside of the cell phone in a hot water cleaner (for example, Speedy Wash (registered trademark) manufactured by PABEMON) that configures the cell phone in a sealed cleaning room and causes the cleaning liquid to flow to the inside of the configured cell phone.(3) A method of connecting a dedicated cleaning adapter to a cell phone dedicated autoclave device (for example, DAC UNIVERSAL 2GUI manufactured by Dentsply Sirona).

[0112] Figure 18 is an explanatory view that shows a case where the cleaning adapter 200 is connected to the nozzle of the spray tank.

[0113] In the above (1), the nozzle attachment 163 is fitted to the spray port of the spray tank 161. The nozzle attachment 163 is formed with an external thread 165 at the tip end thereof that can be fastened to the internal thread 145 of the cleaning adapter 200. The nozzle attachment 163 is fitted to the cleaning adapter 200 by fastening the external thread 165 to the internal thread 145.

[0114] Then, when the cleaning liquid is sprayed from the spray tank 161, the cleaning liquid is supplied to the liquid injection side storage portion 151. The liquid injection side storage portion 151 is filled with the cleaning liquid supplied thereto, and the cleaning liquid is sent from the liquid injection side storage portion 151 to the main body side water injection flow path 43 (refer to Figure 8 ) through the through hole 134 of the water injection flow path connection portion 113. This flow path becomes the above-described central flow path FC.

[0115] Further, the cleaning liquid is sent from the liquid injection side storage portion 151 to the cleaning liquid injection port 49 (refer to Figure 8 ) through the plurality of peripheral holes 125. This flow path becomes the above-described peripheral flow path FS. Here, the cleaning liquid that has passed through the openings of the tip end sides of the respective peripheral holes 125 is temporarily stored in the liquid delivery side storage portion 153. The liquid delivery side storage portion 153 is a sealed space between the rear end of the connection portion 21 and the counterbore portion 129 that is connected to the recessed portion 117, and can stably supply the cleaning liquid to the cleaning liquid injection port 49 of the connection portion 21 by the internal pressure of the cleaning liquid that fills this space.

[0116] Even in a case where the peripheral holes 125 and the peripheral positions of the cleaning liquid injection ports 49 do not overlap and are positionally offset from each other, the liquid delivery side storage portion 153 can uniformly supply the cleaning liquid to each of the cleaning liquid injection ports 49. Further, it is possible to easily increase the amount of supply of the cleaning liquid.

[0117] Figure 19 This is an explanatory diagram showing a situation where a cleaning connector 200 is connected to a mobile phone holder 167 in a hot water cleaner.

[0118] The phone holder 167 of the hot water cleaner is made of a soft elastomer such as silicone rubber, and cleaning fluid is supplied from the cleaning fluid supply port 171 at the bottom of the holder recess 169.

[0119] In the case described in (2) above, the dental handpiece can be secured to the hot water cleaner with a simple operation of inserting the shaft portion 141 of the cleaning connector 200 into the bracket recess 169. The flow of the cleaning fluid in this case is similar to that described above. Figure 18 The situation is the same.

[0120] (Second example of a cleaning connector)

[0121] Figure 20 This is a cross-sectional view showing the configuration of the cleaning connector 210 connected to the high-pressure autoclave device for mobile phones.

[0122] The cleaning connector 210 in the above (3) case is the same as the above. Figure 14 The connector body 111 shown is separate from the cleaning equipment connection part 115, and is composed of a connector body 173 and a water injection flow path connection part 113.

[0123] A base 177 is provided at the rear end of the connector body 173, and the base 177 has a groove 175 for fixing to the autoclave device. Injection holes 179A and 179B for injecting cleaning fluid are formed on the bottom surface of the groove 175, and either one can be selectively used depending on the type of autoclave device. The top ends of the injection holes 179A and 179B are connected to a through hole 181, which communicates with a plurality of peripheral holes 125 and a through hole 134 of the water injection flow path connection portion 113. The two ends of the through hole 181 are blocked by suitable plugs 183, thus defining a space that becomes the aforementioned liquid injection side storage portion 151.

[0124] According to the cleaning connector 210, the cleaning fluid injected from either of the injection holes 179A or 179B is sent to the main body side water injection path 43 through the through hole 134 (see reference). Figure 8 The cleaning fluid is supplied to the central flow path FC. Additionally, the cleaning fluid is delivered through the peripheral orifice 125 to the cleaning fluid inlet 49 (see reference). Figure 8 The liquid is sent to the peripheral flow path FS. A space is divided on the top side of the peripheral hole 125 to form a liquid delivery side storage section 153, which can stably supply cleaning liquid to the cleaning liquid injection port 49.

[0125] The present application is not limited to the above-described embodiments, and can be appropriately modified, improved, or the like. In addition, the material, shape, size, numerical value, method, number, arrangement position, and the like of each component in the above-described embodiments are arbitrary and are not limited as long as the present application can be achieved.

[0126] As described above, the following is disclosed in this specification.

[0127] (1) A dental handpiece comprising:

[0128] a cylindrical main body case;

[0129] an insert-constituting body configured to include an ultrasonic transducer, the insert-constituting body being housed in the main body case in a manner that a tip end portion thereof blocks a case tip end of the main body case and a rear end portion thereof blocks a case rear end of the main body case;

[0130] a tip connection portion provided at the tip end portion of the insert-constituting body to detachably connect a dental handpiece tip that transmits ultrasonic vibrations from the ultrasonic transducer; and

[0131] a cleaning liquid flow path that guides a cleaning liquid supplied from a cleaning liquid injection port provided at the rear end portion of the insert-constituting body to a case tip end portion of the main body case,

[0132] the cleaning liquid flow path has a case inner immersion flow path that immerses the insert-constituting body in the cleaning liquid within the main body case and causes the cleaning liquid in which the insert-constituting body is immersed to be discharged from the case tip end portion.

[0133] According to the dental handpiece, the cleaning liquid supplied from the connection portion immerses the insert-constituting body within the main body case, and the cleaning liquid in which the insert-constituting body is immersed is discharged from the case tip end portion. Therefore, it is possible to treat the residue accumulated within the main body case with the cleaning liquid without disassembling the dental handpiece.

[0134] (2) The dental handpiece according to (1), wherein

[0135] the insert-constituting body includes a housing member disposed inside the main body case to cover an outside of the ultrasonic transducer,

[0136] the case inner immersion flow path includes an inside flow path between the ultrasonic transducer and the housing member and an outside flow path between the housing member and the main body case.

[0137] According to the dental handpiece, by causing the cleaning liquid to flow to the inside flow path and the outside flow path of the housing member within the main body case, the cleaning liquid is stirred and can efficiently treat the dirt within the main body case.

[0138] (3) The dental handpiece according to (2), wherein

[0139] The housing member is formed with a through-hole that communicates the inner flow path with the outer flow path.

[0140] According to the dental handpiece, the cleaning liquid flows from the inner side to the outer side of the housing member through the through-hole, and from the outer side to the inner side, so that the cleaning liquid flows throughout the housing member, and is less likely to be clogged.

[0141] (4) The dental handpiece according to (2) or (3), wherein

[0142] At least one of the inner peripheral surface and the outer peripheral surface of the housing member is formed with a protrusion that protrudes in the thickness direction of the housing member or a recess that is recessed in the thickness direction.

[0143] According to the dental handpiece, the stirring effect of the cleaning liquid is improved by the protrusion or the recess.

[0144] (5) The dental handpiece according to any one of (2) to (4), wherein

[0145] The ultrasonic vibrator includes an ultrasonic vibration source and a vibration transmission member that transmits ultrasonic vibrations generated from the ultrasonic vibration source to the dental handpiece tip,

[0146] The housing member includes a tip-side collar that covers between the ultrasonic vibration source and a tip end portion of the vibration transmission member, and a rear end-side collar that covers between the ultrasonic vibration source and the cleaning liquid injection port, and has the cleaning liquid injection port that supplies the cleaning liquid to the cleaning liquid flow path.

[0147] According to the dental handpiece, the cleaning liquid flow path is formed along the tip-side collar and the rear end-side collar.

[0148] (6) The dental handpiece according to (5), wherein

[0149] At least one of the tip-side collar and the rear end-side collar is composed of a pair of collar halves that are semi-divided in a cylindrical shape, and has an engagement portion that engages a claw portion provided on either one of the collar halves with a receiving portion provided on the other one of the collar halves when the collar halves are combined with each other.

[0150] According to the dental handpiece, the stirring effect of the cleaning liquid is improved by the concave-convex formed by the claw portion and the receiving portion of the engagement portion.

[0151] (7) The dental handpiece according to (6), wherein

[0152] The claw portion is formed to be surrounded by a slit formed in the collar half.

[0153] According to the dental handpiece, since the claw portion is configured to be surrounded by the slit, a through-hole is formed around the claw portion. The cleaning liquid flows to the inside and outside of the housing member through the through-hole.

[0154] (8) The dental handpiece according to any one of (2) to (7), wherein the inside immersion flow path in the housing has:

[0155] a flow path narrowing portion that gradually reduces a flow path cross-sectional area of the outside flow path from the rear end portion side of the main body housing toward the tip end portion side;

[0156] a flow path restriction portion that makes the housing member and a portion of the main body housing contact each other at a tip end of the flow path narrowing portion to restrict a portion of the flow of the cleaning liquid of the outside flow path; and

[0157] a flow path expanding portion that gradually increases the flow path cross-sectional area of the outside flow path from the flow path restriction portion toward the tip end portion side.

[0158] According to the dental handpiece, the outside flow path of the cleaning liquid is narrowed in the flow path narrowing portion, a portion of the flow path is restricted in the flow path restriction portion, and the outside flow path is expanded in the flow path expanding portion, and by the narrowing and expanding of the flow path cross-sectional area thus achieved, agitation of the cleaning liquid is promoted.

[0159] (9) The dental handpiece according to (8), further comprising:

[0160] a flow path re-narrowing portion that gradually reduces the flow path cross-sectional area of the outside flow path from the flow path expanding portion toward the tip end portion side; and

[0161] an outside flow path restriction portion that makes the housing member and a portion of the main body housing contact each other at the tip end portion side of the flow path re-narrowing portion to restrict a portion of the flow of the outside flow path,

[0162] the dental handpiece discharges the cleaning liquid from the inside flow path and the outside flow path respectively from different discharge ports around the tip end connecting portion.

[0163] According to the dental handpiece, a portion of the cleaning liquid of the outside flow path that passes through the flow path re-narrowing portion is restricted by the outside flow path restriction portion, whereby the cleaning liquid is turbulently agitated at the tip end portion side where the residue is the most and is discharged from the discharge port of the outside flow path.

[0164] (10) The dental handpiece according to any one of (1) to (9), wherein,

[0165] The cleaning liquid flow path includes a main body side water injection flow path that is connected to a tip side water injection flow path of the dental unit tip through a through hole along a center axis of the insert structure.

[0166] According to the dental handpiece, by causing the cleaning liquid to flow to the main body side water injection flow path, the main body side water injection flow path can be cleaned.

[0167] (11) A dental handpiece with a cleaning adapter, comprising:

[0168] The dental handpiece according to (10); and

[0169] The cleaning adapter is detachably connected to the rear end of the dental handpiece, and injects the cleaning liquid supplied from an external device into the housing inner immersion flow path and the main body side water injection flow path.

[0170] According to the dental handpiece with a cleaning adapter, the cleaning liquid from the external device can be supplied to the housing inner immersion flow path and the main body side water injection flow path.

[0171] (12) The dental handpiece with a cleaning adapter according to (11), wherein the cleaning adapter comprises:

[0172] An external connection portion connected to an external device side that supplies the cleaning liquid;

[0173] A liquid injection side storage portion that stores the cleaning liquid supplied from the external connection portion;

[0174] A central flow path that communicates with the liquid injection side storage portion and is connected to the main body side water injection flow path of the dental handpiece; and

[0175] A plurality of peripheral flow paths that communicate with the liquid injection side storage portion and are connected to the housing inner immersion flow path of the dental handpiece.

[0176] According to the dental handpiece with a cleaning adapter, the cleaning liquid from the external connection portion can be stably injected to both the central flow path and the peripheral flow paths through the liquid injection side storage portion.

[0177] (13) The dental handpiece with a cleaning adapter according to (11), wherein the cleaning adapter comprises:

[0178] An external connection portion connected to an external device side that supplies the cleaning liquid;

[0179] A central flow path and a plurality of peripheral flow paths that respectively communicate with the external connection portion, the central flow path being connected to the main body side water injection flow path of the dental handpiece, and the plurality of peripheral flow paths being connected to the housing inner immersion flow path of the dental handpiece; and

[0180] A liquid delivery side storage section is provided between the plurality of peripheral flow paths and the housing inner immersion flow path of the dental handpiece, and stores the cleaning liquid delivered from the plurality of peripheral flow paths and supplies the cleaning liquid to the housing inner immersion flow path.

[0181] According to the dental handpiece with a cleaning adapter, the cleaning liquid supplied from the plurality of peripheral flow paths is stored in the liquid delivery side storage section, and the cleaning liquid is supplied to the housing inner immersion flow path by the internal pressure of the cleaning liquid filling the liquid delivery side storage section. Therefore, the cleaning liquid can be stably supplied to the housing inner immersion flow path regardless of the formation position of the plurality of peripheral flow paths.

[0182] (14) The dental handpiece with a cleaning adapter according to (12) or (13), wherein

[0183] The external connection section has a recess portion communicating with the central flow path and the peripheral flow path,

[0184] An internal thread is formed on an inner circumferential surface of the recess portion, and connects with a cleaning liquid supply port of the external device.

[0185] According to the dental handpiece with a cleaning adapter, the internal thread is fastened with an external thread of the cleaning liquid supply port of the external device, and the cleaning liquid can be delivered from the external device to the dental handpiece side.

[0186] (15) The dental handpiece with a cleaning adapter according to (12) or (13), wherein

[0187] The external connection section has a cylindrical protrusion portion protruding in the axial direction,

[0188] The inside of the cylindrical protrusion portion communicates with the central flow path and the peripheral flow path.

[0189] According to the dental handpiece with a cleaning adapter, by inserting the cylindrical protrusion portion into a holder recess portion of a handpiece holder of the external device having a cleaning liquid supply port, the inner circumferential surface of the handpiece holder is in close contact with the outer circumferential surface of the cylindrical protrusion portion, and the cleaning liquid can be delivered from the external device to the dental handpiece side.

[0190] (16) The dental handpiece with a cleaning adapter according to (12) or (13), wherein

[0191] The external connection section has a cleaning liquid injection hole communicating with the central flow path and the peripheral flow path,

[0192] An outer side opening of the cleaning liquid injection hole is formed on a groove bottom surface of a groove engaged with the external device.

[0193] According to the dental handpiece with the belt cleaning joint, the cleaning liquid can be sent from the external device to the dental handpiece side through the cleaning liquid injection hole in the state that the groove of the external connection portion is engaged with the external device.

Claims

1. A dental handpiece comprising: a tubular main housing; an insert-constituting body configured to include an ultrasonic vibrator, the insert-constituting body being housed in the main housing with a tip end portion of the insert-constituting body blocking a housing tip end of the main housing and a rear end portion of the insert-constituting body blocking a housing rear end of the main housing; a tip connecting portion provided at the tip end portion of the insert-constituting body to detachably connect a dental tool tip that transmits ultrasonic vibrations from the ultrasonic vibrator; and a cleaning liquid flow path that guides a cleaning liquid supplied from a cleaning liquid injection port provided at the rear end portion of the insert-constituting body to a housing tip end portion of the main housing, the cleaning liquid flow path having a housing-internal immersion flow path that immerses the insert-constituting body in the cleaning liquid within the main housing and discharges the cleaning liquid in which the insert-constituting body is immersed from the housing tip end portion, the insert-constituting body including a casing member disposed inside the main housing to cover an outer side of the ultrasonic vibrator, the housing-internal immersion flow path including an inner side flow path between the ultrasonic vibrator and the casing member and an outer side flow path between the casing member and the main housing.

2. The dental handpiece according to claim 1, wherein a through hole that communicates the inner side flow path and the outer side flow path is formed in the casing member.

3. The dental handpiece according to claim 1 or 2, wherein at least one of an inner peripheral surface and an outer peripheral surface of the casing member is formed with a protrusion that protrudes in a thickness direction of the casing member or a recess that is recessed in the thickness direction.

4. The dental handpiece according to claim 1 or 2, wherein the ultrasonic vibrator includes an ultrasonic vibration source and a vibration transmission member that transmits ultrasonic vibrations generated from the ultrasonic vibration source to the dental tool tip, the casing member includes a tip end side collar that covers between the ultrasonic vibration source and a tip end portion of the vibration transmission member and a rear end side collar that covers between the ultrasonic vibration source and the cleaning liquid injection port having an injection port that supplies the cleaning liquid to the cleaning liquid flow path.

5. The dental handpiece according to claim 4, wherein at least one of the tip end side collar and the rear end side collar is constituted by a pair of collar halves that are semi-split tubular, the collar halves having a claw portion provided at either one and a receiving portion provided at the other one that are engaged with each other when the collar halves are combined with each other.

6. The dental handpiece according to claim 5, wherein the claw portion is surrounded by a slit formed in the collar half.

7. The dental handpiece according to claim 1, wherein the housing-internal immersion flow path has: a flow path narrowing portion that gradually reduces a flow path cross-sectional area of the outer side flow path from the rear end portion side of the main housing toward the tip end portion side; a flow path restricting portion that restricts a part of a flow of the cleaning liquid of the outer side flow path by bringing the casing member and a part of the main housing into contact with each other at a tip end of the flow path narrowing portion; and a flow path expanding portion that gradually increases the flow path cross-sectional area of the outer side flow path from the flow path restricting portion toward the tip end portion side. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 7. The dental handpiece of claim 1 or 2, wherein, ​ ​ ​ ​ ​ 8. The dental handpiece of claim 7, wherein, ​ a flow path again narrowing portion in which a flow path cross-sectional area of the outer flow path gradually decreases from the flow path expanding portion toward the tip end portion side; and an outer flow path restricting portion in which the housing member and a portion of the main body housing are in contact with each other to restrict a portion of the flow of the outer flow path on the tip end portion side of the flow path again narrowing portion, the dental handpiece discharges the cleaning liquid from the inner flow path and the outer flow path from different discharge ports around the tip connection portion, respectively.

9. The dental handpiece according to claim 1 or 2, wherein the cleaning liquid flow path includes a main body side water injection flow path that is connected to a tip side water injection flow path of the dental handpiece tip through a through hole along a center axis of the insert body.

10. A dental handpiece with a cleaning adapter, comprising: the dental handpiece according to claim 9; and a cleaning adapter that is detachably connected to a rear end of the dental handpiece and guides the cleaning liquid supplied from an external device to the housing inner immersion flow path and the main body side water injection flow path.

11. The dental handpiece with a cleaning joint according to claim 10, wherein, the cleaning adapter includes: an external connection portion that is connected to the external device that supplies the cleaning liquid; a liquid injection side storage portion that stores the cleaning liquid supplied from the external connection portion; a central flow path that is in communication with the liquid injection side storage portion and is connected to the main body side water injection flow path of the dental handpiece; and a plurality of peripheral flow paths that are in communication with the liquid injection side storage portion and are connected to the housing inner immersion flow path of the dental handpiece.

12. The dental handpiece with a cleaning joint according to claim 10, wherein, the cleaning adapter includes: an external connection portion that is connected to the external device that supplies the cleaning liquid; a central flow path and a plurality of peripheral flow paths that are in communication with the external connection portion, the central flow path is connected to the main body side water injection flow path of the dental handpiece, and the plurality of peripheral flow paths are connected to the housing inner immersion flow path of the dental handpiece; and a liquid delivery side storage portion that is provided between the plurality of peripheral flow paths and the housing inner immersion flow path of the dental handpiece, stores the cleaning liquid delivered from the plurality of peripheral flow paths, and supplies the cleaning liquid to the housing inner immersion flow path.

13. The dental handpiece with a cleaning adapter according to claim 11 or 12, wherein the external connection portion has a recess portion that is in communication with the central flow path and the peripheral flow paths, an internal thread that is connected to a cleaning liquid supply port of the external device is formed on an inner peripheral surface of the recess portion.

14. The dental handpiece with a cleaning adapter according to claim 11 or 12, wherein the external connection portion has a cylindrical protrusion portion that protrudes in an axial direction, an inner side of the cylindrical protrusion portion is in communication with the central flow path and the peripheral flow paths.

15. The dental handpiece with a cleaning adapter according to claim 11 or 12, wherein the external connection portion has a cleaning liquid injection hole that is in communication with the central flow path and the peripheral flow paths, an outer side opening of the cleaning liquid injection hole is formed on a groove bottom surface of a groove that is engaged with the external device.

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