DE8904304U1 - Dental suction device - Google Patents

Description

89 6 3 1 6 O EN

&zgr;-\ 1 Siemens Aktiengesellschaft '··' ^: '··'-·'

Dental suction device
5

Known suction handpieces usually consist of a rotationally symmetrical, straight tube, which is either permanently or detachably connected to the suction hose.

Dental suction devices often contain control devices in the suction handpieces in order to be able to change the suction volume and thus the flow rate by changing the cross-section. Such control devices can be constructed in different ways. For example , it is known to have a

A metal or plastic plate should be provided which can be pushed into the suction channel like a slider. It is also known to arrange a plug valve in the suction channel transverse to the flow opening using a knurled wheel that can be operated from the outside. A small filter is often inserted between the hose connection and the suction handpiece 9, which serves to catch larger suction particles, in particular gold and amalgam fillings.

The disadvantage of such suction devices is that the filtering measures are inadequate. The relatively small filter ~ quickly becomes clogged and, due to the narrowing of the cross-section, leads to unpleasant suction noises in this area.

The aim of the present invention is to achieve an improvement in this respect, in particular with the aim of optimizing the suction noise, insofar as its causes lie in the handpiece.

Because according to the invention the filter part - and according to a particularly advantageous development of the invention also

Rp 2 Sbt / 03.04.1989

01 01

89 6 3 1 6 O EN

the flow rate control'l'tirig &eeacgr;-ichti hahdstückseite, but on

, the end of the suction hose facing away from the handpiece, i.e. on the device side, the suction noise at the preparation site can be reduced considerably. Particular advantages arise from the fact that the means for regulating the suction volume are integrated in the filter block. By moving the measures for regulating the flow rate from the handpiece to

s an external filter block for the handpiece can, on the one hand, the flow cross-section in the area of the handpiece

• .10 larger, which results in a lower and more uniform flow velocity and thus a reduced noise during suction, on the other hand, the filter provided for retaining solid particles can also be dimensioned sufficiently large.
15

Further advantages emerge from the following description of an embodiment. They show:

FIG 1 a dental suction device with a suction cannula and part of a suction hose in a typical use position,

25

FIG 2 the arrangement shown in FIG 1 partly in longitudinal section and in dismantled state,

-. FIG 3 the suction handpiece in a straight swivel position;

FIG 4 and 5 Detailed views of a handpiece part of the

suction handpiece,
30

FIQ 6 an example of a filter block in side view, partly in longitudinal section,

FIG 7 the filter block shown in FIG 6 in a position rotated by 90" (front view),

U74 Ul UZ

89 G 3 1 6 O EN

, 1 FIG 6 a device connection flange for connecting the filter block shown in FIG 6/7,

FIG 9 shows the filter shown in FIG 7 as a detail and 5

FlG 10 the throttle valve shown in FIG 7 as a detail.

FIG. 1 shows a diagrammatic representation of a dental suction handpiece, generally designated 1, together with a suction cannula 2 and a suction hose 3 in a typical position. In riar rite ^aiinWaniilp ? raUHu ct-&rgr;&Pgr;

- - sr r - · ———— -j. - — - ——— ·_, — _ —— _

with it pointing downwards at an unspecified suction point. The suction handpiece 2 consists of two parts, (a front part la, to which the suction cannula 2 can be attached, and a rear part lb, to which the suction hose 3 is detachably attached. As explained in more detail later, the two parts la, lb can be rotated against each other in the direction of the arrow so that they can be brought from the angled position shown in FIGS. 1 and 2 into a straight position (FIG. 3). This is made possible by a swivel joint, generally designated 4, at the connection point between the two parts la and lb.

FIG. 2 shows the suction handpiece arrangement according to FIG. 1 with the suction cannula 2 and hose 3 removed; FIG. 3 shows the suction handpiece in a straight position. The front end 5 of the handpiece part la facing the suction cannula 2 is slightly conical to accommodate the suction cannula 2. The rear end 6 contains a cylindrical inner surface 7, which overlaps an otherwise cylindrical outer surface 8 of the end part 9 of the handpiece part üb. The cylinder axes 10 of the cylinders formed by the surfaces 7, 3 run to the rotational symmetry axes 11, 12 of the handpiece parts la, 1b at an angle oC = 30', whereby the front connection surfaces 13, 14, which are also inclined by the angle <λ/ to the rotational symmetry axes, have a circular cross section.

01 03

89 G 3 1 6 O OE

whereby the formed handpiece parts la, 1b can be pivoted against each other about the axis of rotation 10 in such a way that in the single position the longitudinal axes of the two handpiece parts enclose an angle f = 60 ^° (FIG. 2) and in the other case the axes are aligned with each other (FIG. 3). As can be seen from FIGS. 2 and 3, the two line channels 15, 16 are connected to each other by arcuate bends 17, whereby a clean transition is formed without disturbing steps and edges.

A known O-ring locking mechanism 18 is provided for the axial locking and fixing of the two handpiece parts la, lb. The O-ring serves both as a seal and, due to its elasticity, as an orbital locking mechanism for the two parts. In order to be able to fix the handpiece parts (( in defined rotational positions, several axial projections 19 are provided on the circumference of the front side of the handpiece part la (FIG. 4, 5), which engage in correspondingly designed recesses on the counterpart at the front end of the handpiece part lb.

As an alternative to the illustrated swivel joint arrangement with two concentrically arranged and interlocking cylindrical sections, it is also conceivable to provide two interlocking spherical sections. With such an arrangement, the adjustment options can be expanded even further.

V One straight end 3a of the hose 3 is attached to the suction handpiece 1 by means of an O-ring plug connection 2Q in an easily detachable manner. The other hose end 3b (FIG. 6) leads via a 90' pipe bend 21 into a filter block generally designated 22. A further O-ring catch 23 creates a rotatable, easily detachable connection.

The filter block 22 is installed in the device so that the combined

ned rotary/plug connection with the horizontal axis of rotation 24 can rotate transversely to the removal direction of the suction handpiece

01 04

89 G 3 1 6 O EN

^ · » · (lfiltl 4 ti«

This means that the hose can be pivoted in the direction of the arrow shown in FIG 7, which increases the reach of the suction handpiece when handling it.

The filter block 22 consists of a housing 25, preferably made of plastic, which contains a first cylindrical space 26 in which (FIG. 7) a filter part 27 is removably arranged by means of an O-ring catch 28. The cylindrical space 26 merges into a radially extending straight through-channel 29 in which a throttle valve 30 is arranged.

The filter part 27 is shown as an individual part in FIG 9. It preferably consists of two parts, a first part 31 having the handle for removing the filter and a filter insert 32 that can be detached from this. The filter insert 32 contains a sieve 33 arranged transversely to the flow direction for retaining coarse particles as well as several chambers 34 formed by longitudinal walls in which the particles can collect. The chambers 34 are not in the direct flow area of the suction material.

The throttle valve 30 is also mounted in the filter block 22 by means of an O-ring catch 35 so that it can rotate and can be easily released axially. The rotatability is limited by a guide pin 36 which engages in a guide groove 37 (FIG. 6) arranged in segments in the filter block housing 25. The free cross-section of the through-channel 29 can be changed within certain limits by means of the throttle valve 30, which can be adjusted from the outside by means of a handle 38. For this purpose, the throttle valve 30 contains a blocking element 40 with which the maximum flow cross-section can be set in one position and a considerably reduced flow cross-section in the other position.

The entire filter block 16 can be connected to a further

Cl05

89 G 3 1 6 O OE

* · Il

IIt

I ItII

t t

&bull; · · ■ ■! s te",

The flange 42 is in turn fastened in a vertical position to a device part generally designated 43, in which the further guidance and processing of the suction material is carried out in a known manner. Since this part is not essential to the invention, these parts will not be described in more detail.

As can be seen from the above, the

Regulation of the suction volume and thus the adjustment of the suction power externally of the suction handpiece in a separate filter block, which is easily detachably attached to a device part at the end of the hose 3 facing away from the suction handpiece and to which the hose end 3b is attached by means of a connecting part. By moving the flow control from the handpiece to the device-side end of the hose, on the one hand a considerable reduction in the suction noise in the area of the handpiece can be achieved, and on the other hand, due to the lack of measures for adjusting the suction cross-section, the largest possible suction cross-section can be achieved with a smooth passage. Other significant advantages are that all components, both in the handpiece and in the filter block area, are easily detachably held in place using O-ring plug connections, which serve both to lock in place and to seal the suction channels against the atmosphere, thus enabling the individual components to be easily replaced, e.g. for cleaning, thermal disinfection or sterilization purposes.

01 06

Claims (9)

89 G 3 1 6 O OE Protection claims ' · '■·' ··" 1. Dental suction device, characterized by a filter block (22) connectable to a device-side connection (42), at the inlet of which the one
end (3b) of a suction hose (3) and whose outlet can be connected to the device-side connection (42),
and that a removable filter part (27) for collecting solid particles is provided in the filter block (22). 2. Suction device according to claim 1, characterized in that a throttle valve (30) for adjusting the flow cross-section is arranged in the filter block (22). 3. Suction device according to claim 1, characterized in that the filter part (27) in the non
collection and deposition chambers (34) located in the immediate flow area. 4. Suction device according to claim 3, characterized in that the filter part (27) is designed in two parts and comprises a carrier part (31) containing a handle and a filter part containing a filter screen (33)
(32). 5. Suction device according to claim 2, characterized in that the throttle cap (30) on the
Filter block (22) is easily removable. 6. Extraction device according to claim 5, characterized in that the throttle valve (30) contains means (36, 37) for limiting the throttle valve position. 7. Suction device according to claim 1, characterized in that both the connection of the 02 Oi 89 6 3 1 6 0 OE > &bull; a · · &bull; a &igr; . Q &bull; · · · ti! Ji 1 The connection of the hose end (36) to the filter block (220) and the connection of the filter block (22) to the device connection (42) is carried out by means of an O-ring lock (23, 41). 5 8. Suction device according to claim 1, characterized in that the connection of the device-side hose end (3b) is designed as a combined rotary plug connection. 10 9. Extraction device according to claim 8, characterized in that the combined rotary star connection is a pre-wide 90' bend (21) which is held with a horizontal pivot axis in the filter block (22). 094 02