EP0341283A1

EP0341283A1 - Therapeutic device, in particular for irrigating bones, wounds, the abdominal cavity or similar

Info

Publication number: EP0341283A1
Application number: EP88910016A
Authority: EP
Inventors: Edeltraut Ziemann
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-11-20
Filing date: 1988-11-18
Publication date: 1989-11-15
Also published as: DE3739418A1; WO1989004683A1

Abstract

Es wird eine Vorrichtung zum Behandeln, insbesondere Spülen von Knochen, Wunden, der Bauchhöhle oder dergleichen Teilen des menschlichen oder tierischen Körpers mit aseptischer Flüssigkeit aufgezeigt. Hierbei ist eine drehangetriebene Pumpe (10) vorgesehen, mittels derer die Flüssigkeit unter Druck und pulsierend durch ein Spülrohr (27) bzw. einen Schnorchel zum Behandlungsort för derbar ist. Die Pumpe (1) ist so ausgebildet, dass sie zum Antrieb durch Adaptermittel (3) mit einer Druckluft- Bohrma schine koppelbar (10) ist, so dass ein handliches Gerät entsteht. It becomes a device for Treating, in particular rinsing bones, wounds, the abdominal cavity or similar parts of the human or animal body with aseptic liquid. A rotary pump (10) is provided, by means of which the liquid under pressure and pulsating through a flushing tube (27) or a snorkel Treatment place for is derbar. The pump (1) is designed in such a way that it can be driven by adapter means (3) with a compressed air Drilling can be coupled (10) so that a handy device is created.

Abstract

A therapeutic device, in partic ular for irragating bones, wounds , the abdominal cavity or similar parts of the human or animal body with an aseptic liquid comprises a rotationally driven pump (10) which forces the fluid under pressure and pulseways through an irrigation tube (27) or snor kel to the site of interest. The pump (10) can be driven by a compressed-air drilling machine to which it can be coupled (1) by means of an adaptor (30), which makes it a very handy ap pliance. A therapeutic device, in partic ular for irragating bones, wounds, the abdominal cavity or similar parts of the human or animal body with an aseptic liquid comprises a rotationally driven pump (10) which forces the fluid under pressure and pulseways through an irrigation tube (27) or snor kel to the site of interest. The pump (10) can be driven by a compressed air drilling machine to which it can be coupled (1) by means of an adapter (30), which makes it a very handy ap pliance.

Description

Device for treating, in particular rinsing bones, wounds, the abdominal cavity or the like

description

The invention relates to: a device for treating, in particular for rinsing bones, wounds, the abdominal cavity or the like parts of the human or animal body with aseptic liquid according to the preamble of claim 1.

In surgery there is often a need to clean wound areas. If, for example, a prosthesis is to be inserted into a bone using bone cement, the interstitials initially clogged with blood and fragments must be exposed, since otherwise the bone cement will not find a hold. In order to carry out such cleaning, it is known: to use a hose pump (roller pump) cleaning liquid by means of a spray tube or snorkel towards the area to be cleaned spray and so wash off the disturbing impurities. A major disadvantage of this device is that such pumps are driven by an electric motor and that electrically driven machines in the operating room have been recognized as disadvantageous, since the inevitable interference pulses of an electric motor disturb sensitive measuring devices (EKG, etc.) and, moreover, involve dangers due to the spark formation can bring oneself. Furthermore, when using a peristaltic pump, the amount of rinsing liquid that is necessary for thorough cleaning of a specific wound area is relatively large, so that an equally large amount of liquid must be suctioned off again.

Starting from the above-mentioned prior art, it is the task of the present invention to develop a device of the type mentioned at the outset such that an improved cleaning effect can be achieved with a reduced amount of rinsing liquid without an electric motor drive.

This object is achieved in that the pump can be coupled to a compressed air drilling machine for driving by adapter means. Compressed air drills of this type are in any case present in every operating room, so that at least the drive of the pump can be ensured by means of an already existing device which works without an electric motor. Furthermore, such a pump can be regulated very well, i.e. the liquid flow can be adapted exactly to the requirements, which is very difficult with a peristaltic pump.

In particular, the object is achieved in that the pump is a gear pump to which the spray tube or the snorkel can be connected directly. The gear pump is designed for the pulsating delivery of liquid. This pulsating delivery substantially reduces the amount of liquid required for cleaning, since the individual pulses ("splashes") have a substantially large bring with it a cleaning effect than the continuous stream. If you compare this solution to the problem with the known device, which has a peristaltic pump, the peristaltic pump itself also delivers in a pulsating manner, but the pulsating delivery flow is initially reduced by a long one

Hose piece passed, which forms a spring element due to its elasticity, so that a mass-spring system is created. This mass-spring system now has a "low-pass characteristic", ie the rapid pressure increases are smoothed out. In contrast, the arrangement according to the invention ensures that the pressure pulses generated by the gear pump reach the flushing pipe unfiltered, that is to say in full sharpness. In this case, the pump is preferably mounted directly on and driven by a compressed air drilling machine, so that a handy, compact device is produced, which is particularly important for use in the operating room.

Gear pumps in themselves are those displacement machines which (in addition to screw pumps) have the lowest degree of non-uniformity in the delivery flow. The present invention takes a completely different route, which consists in designing a gear pump in such a way that a particularly strongly pulsating delivery flow is produced. This can be solved in various ways.

In a first embodiment of the invention, a gear pump with as few teeth as possible, in extreme cases a capsule pump (two teeth), is used so that the delivery flow pulsates strongly. In a second preferred embodiment of the invention, the pulsation is achieved in that the sealing gap between the two gear wheels is opened again and again by means of recesses in at least one of the two gear wheels, so that a "short circuit" between the inlet and outlet arises. During this short circuit, therefore, no pressure medium is delivered, so that when the recess passes the sealing gap between the two gear wheels, the pressure increases again abruptly. In a third, particularly preferred embodiment of the invention, a (rotary) slide is provided which rotates with one of the gearwheels and opens and closes the pressure outlet of the pump directly. In this preferred embodiment of the invention, the pressure increase is particularly strong, so that the necessary flow rate or the amount of liquid required to clean a certain surface is minimal.

The rinsing liquid is preferably stored in a cartridge which can be coupled directly to the pump mounted on a compressed air drilling machine via suitable adapter means (bayonet closure). As a result, there is no need to provide a special hose for supplying liquid, which makes the whole device even more manageable. Of course, it is also possible to connect a feed hose (possibly via the same connection means to the pump) instead of the cartridge.

Further features essential to the invention result from the subordinate claims and the following description of preferred embodiments of the invention, which are explained in more detail with the aid of illustrations. Here show:

1 shows a partially sectioned side view of a pump which is mounted together with the liquid cartridge on a compressed air drilling machine;

2 shows a partially sectioned side view of a housing part of the pump according to FIG. 1;

Fig. 3 is a view of the pump of Figure 2 along the line III-III.

^F --g- 4 a view: of the pump according to FIG. 2 along the line IV-IV; 5 is a partially sectioned side view of the second pump housing part of the pump according to FIG. 1;

FIG. 6 shows a view of the housing according to FIG. 5 along the line VI-VI from FIG. 5;

Fig. 7 is a partially sectioned side view of the

Adapter for connecting the pump to a compressed air drilling machine according to Fig. 1;

Fig. 8 is a view along the line VIII-VIII of Fig. 7;

9 shows a partially sectioned side view of a coupling piece for connecting a spray tube to the pump;

Fig. 10 is a view along the line X-X of Fig. 9;

FIG. 11 is a side view of the drive pin of the pump from FIG. 1;

Fig. 12 is a view taken along the line XII-XII of Fig. 11;

Fig. 13 is a partially sectioned side view of the first

Gear of the gear pump according to Fig. 1;

FIG. 14 is a view along the line XIV-XIV from FIG. 13;

15 is a partially sectioned side view of the second

Gear of the pump of FIG. 1;

Fig. 16 is a view taken along the line XVI-XVI of Fig. 15;

Fig. 18 is a view along the line XVIII-XVIII from

Fiσ. 17; 19 shows a schematic illustration of the gear wheels of a second preferred embodiment of the invention;

Fig. 20 is a view taken along the line XX-XX of Fig. 19;

21 shows a plan view of a housing part of a further preferred embodiment of the pump, similar to the view according to FIG. 6; and

FIG. 22 is a sectional view along the line XXII-XXII from FIG. 21.

In the following explanation, the same reference numerals have been chosen for identical or identically acting parts. A first preferred embodiment of the invention is explained with reference to FIGS. 1 to 18.

As can be seen from FIG. 1, the device according to the invention comprises a gear pump, the housing of which consists of a housing part 11 and a housing part 11 ', which are firmly connected with the interposition of an O-ring 5 and sealed by means of screws 26 are.

In the first housing part 11, recesses are provided, in which a first gear 20 ′ meshes with a second gear 20. The first gear wheel 20 'is mounted on a shaft which forms a drive pin 12 which protrudes from the pump housing part 11.

On the housing part 11 of the pump, an adapter sleeve 31 is flanged by means of screws 38, which is designed in such a way that a compressed air drilling machine 1 can be clamped in the adapter sleeve 31 with a shaft part 2 of the drilling machine housing 3. The drive pin 12 inserts into a chuck 4 of the drilling machine 1 in such a way that a positive connection between the chuck 4 and the attachment Drive pin 12 arises. In this way, the gear 20 'and thus also the gear 20 can be driven via the drilling machine 1.

The pump 10 also has an inlet slot 13 which communicates with the interior of a cartridge 32 which can be filled with rinsing liquid. The cartridge 32 can be connected to the pump 10 so tightly and positively by means of a connection 15 fastened to the pump housing part 11 via a bayonet lock that the cartridge 32 is held by the pump 10.

On the side of the pump 10 opposite the cartridge 32 and the drilling machine 1, a spray tube 27 is attached (replaceable) to the second pump housing part 11 'by means of a coupling piece 35. The spray tube 27 is connected distally via a pinch seam 28 and has bores 29 at this end for spraying out liquid, which act as nozzles. Of course, other nozzle forms are possible depending on the intended use.

The detailed construction of the pump is explained in more detail below.

As can be seen from FIGS. 2 to 4, the above-mentioned connection 15 with a bayonet lock 33 for coupling a cartridge 32 to a pump housing part 11 is firmly attached. The attachment is essentially coaxial with the second gear 20. The connection 15 is screwed onto the pump housing by means of screws 39 (see FIG. 4) and comprises a sealing ring 40 which, when a cartridge 32 is inserted and locked, effects a seal between its end face and the pump housing part 11. Inside the sealing ring 40, a slot 13 is machined into the pump housing part 11, which communicates with an inlet bore 14 ′ perpendicular to the axes of rotation of the gears, which is closed on the outside of the housing by a plug 14 ″ and is open at its other end via a bore 14 parallel to the gear axis of rotation into the housing interior (see FIGS. 2 and 3).

The second gearwheel 20 ″ coaxial to the cartridge 32 (see FIG. 15) has at its end facing the cartridge 32 an axle stub 34 via which this gearwheel is rotatably supported in a bearing bore 24 ′ in the first pump housing part 11.

As shown in FIGS. 11 to 14, the first gearwheel 20 'is fastened to a disk 12' with bores 12 "of the drive pin 12 by means of screws which are screwed into threaded bores 25 in the first gearwheel ^" 20 ". are screwed, the gear wheel 20 'having a recess 24 which is shaped in such a way that the disk 12' does not protrude beyond the end face of the gear wheel 20. The gear wheel 20 'is sealed off by seals 6 from the housing .

A corresponding bearing recess is provided in the second pump housing part 11 'for mounting an axle stub portion of the drive pin 12 or the first gear 20'.

In the area of the second gear wheel 20 there is a recess 17 'which is concentric with the gear axis of rotation and into which an outlet 16 opens, which has an internal thread around the coupling piece 35 (see FIGS. 9 and 10) with its correspondingly shaped threaded pin 36 to screw onto the second pump housing part 11 '.

The second gear wheel 20 (see FIGS. 15/16) has on its side opposite the axle stub 34 a disk 17 which is fastened to the gear wheel 20 by means of screws IS. The outer circumference of the slides 17 is concentric with that of the ring gear 21 of the gear wheel 20. These slides 17 takes place in the recess 17 '(Fig. 5/6) and has two slots 18, 18' near the edge, which are diametrically opposite one another and are so close to the edge of the slide 17 that they (in the radial direction seen) lie above the ring gear 21. Comparing Figs. 5/6 and

15/16, it can be seen from this that the slots 18, 18 'continue to pass over the outlet 16 during circulation, so that it is covered over a certain circumferential angle of the gearwheel 20 and thus closed or released or is opened into the interior of the housing.

If the pump designed in this way is now driven by means of a drilling machine 1, both gear wheels 20, 20 'rotate and liquid from the cartridge 32 is sucked in through the slot 13 and the bores 14, 14' and conveyed in the direction of the outlet 16 . As long as the outlet 16 is closed by the slide 17, a pressure builds up in the pump housing (pressure side) which is only determined by the manufacturing precision and thus the size of the sealing gap. As soon as one of the slots 18 or 18 'opens the outlet 16, a pressure pulse of liquid shoots through the outlet 16 into the spray tube 27 and out of its nozzles 29 onto the surface to be treated. With every revolution, two pressure-flushing pulses are generated.

7 and 8, the adapter sleeve 31 already explained with reference to FIG. 1 for coupling the drilling machine is drawn again in greater detail, it being clear from the drawing that the adapter sleeve 31 has a clamping flange 41, via which the drill neck 2 attached part of the adapter sleeve 31 can be firmly screwed on by means of a knurled screw.

In a further preferred embodiment of the invention, instead of the disk 17 acting as a slide, a recess 22 is provided in each of the gearwheels 20, 20 'in such a way that the meshing area between the gearwheels Existing sealing gap between inlet and outlet is repeatedly opened again and again when the gears rotate. However, the recesses 22 are sunk only so deep that a positive connection between the two toothed wheels 20, 20 'is ensured during the entire revolution. Of course, it is also possible to provide several such slots here, so that only short pressure pulses alternate with the pump running idle (in terms of delivery).

In combination with the embodiment of the pump described with reference to FIGS. 1 to 18, it can be advantageous if a resilient storage element is provided on the side of the pump interior on which the pressure builds up. Such a memory, as shown schematically in FIGS. 21 and 22, can comprise a resilient wall section 42 in the pump housing part 11 ¹ , which is formed, for example, by concentric cuts 43, 43 'from the inside and outside of the housing , so that there is a kind of bellows. This resilient element ensures that the volume flow conveyed while covering the outlet 16 is accommodated and is then ejected with a preferably uniform pressure during the opening of the outlet 16 through one of the slots 18, 18 '.

As can be seen from the above description, various features, also seen on their own, are claimed as essential to the invention. In particular, it is the case that, on the one hand, a feed pump can be connected directly to a compressed air drilling machine, so that a particularly compact device is produced, and on the other hand, it is a feed pump that is particularly effective for flushing purposes.

The entire pump, except for the drive pin 12, is preferably made of plastic, preferably of polyethylene. The production costs can then be kept so low that a pump can be used (at the manufacturer) Kind assembled, sterilized and sterilized packaged, which is then only opened in the operating room and thrown away after use. In the known devices, such a procedure is excluded in any case for reasons of cost.

Reference list

Air Drill Shaft Section Drill Housing Chuck O-Ring Seal Pump, 11 'Pump Housing Drive Pin * Washer "Hole Inlet Slot, 14' Inlet Hole" Plug Connection Outlet Slider 'Recess, 18' Through Hole Fastening Screws, 20 'Gear, 21 * Ring Gear, 22 * Slot Hole Recess threaded hole screws spray tube squeeze seam bore adapter means adapter sleeve liquid cartridge bayonet lock Axle stub 'bearing bore coupling piece threaded socket pipe base, 39 screw sealing ring clamping flange resilient wall section incision

Claims

Device for treating, in particular rinsing, bones, wounds, the abdominal cavity or the like

1. Apparatus for treating, in particular rinsing bones, wounds, the abdominal cavity or the like parts of the human or animal body with aseptic liquid, such as NaCl solution or the like, with a rotary pump, by means of which the liquid under pressure and pulsating through Spray tube or a snorkel can be conveyed through to the treatment site, characterized in that the pump (10) can be coupled to a compressed air drilling machine (1) for driving by adapter means (30). - IS- 2. Device according to claim 1, wherein the compressed air drilling machine has a pistol-like housing, on the handle of which compressed air actuation means and in the shaft part of the chuck are arranged, characterized in that the adapter means (30.) a Pump housing (11,

11 ') attached adapter sleeve (31) which on the shaft part (2) of the pump housing (11, 11') with simultaneous connection of a drive pin (12) assigned to the pump (10) on the chuck (4) of the drill (1) can be plugged on, both the adapter sleeve (31) with respect to the shaft part (2) of the drilling machine (1) and the drive journal (12) of the pump (10) with respect to the chuck (4) of the drilling machine (1) being secured against rotation.

3. Device for treating, in particular rinsing bones, wounds, the abdominal cavity or the like parts of the human or animal body with aseptic liquid, with a rotary pump, by means of which the liquid under pressure and pulsating through a spray tube or a snorkel Be¬ Handlungsort conveyed is, ^'in particular according to patent claim 1, characterized in that the pump (10) countries a gear pump with two Zahnrä¬ (20, 20'), the inlet (13, 14) with a circuit An¬ ( 15) for the liquid used for the treatment, while the spray tube (27) or the snorkel can be attached to the outlet (16), the gear pump (10) being designed for the pulsating delivery of liquid.

4. The device according to claim 3, characterized in that the gear pump is designed as a (two-tooth) capsule pump. - 5. Device according to claim 3, characterized in that the outlet (10) is a driven gate valve

(17) is assigned, by means of which the outlet (16) in

5 operation with the formation of a pulsating liquid discharge can be alternately opened and closed.

6. The device according to claim 3, d a d u r c h g e k e n n z e i c h n e t, that in at least one of the gears (20, 20 ')

Gear pump (10), the sealing area between the gears (20, 20 ') breaking through recess (22, 22') in the ring gear (21, 21 ') is provided such that the inlet (13, 14) over a certain area of the Gear 5-wheel rotation angle is in flow connection (bypass) with the outlet (16).

7. The device according to claim 5, characterized in that the first gear (20 ') of the gear pump (10) from the pump housing (11) led out drive pin (12) and the second, with the first gear (20') meshing Gear (20) on one side of a pulsator disk (17) with a larger diameter than that

25 has a second gearwheel (20), wherein in the area between the outer circumference of the second gearwheel (20) and the outer circumference of the pulsator disk (17) there is at least one axial opening, in particular in the form of a circumferential slot (18, 18 ' ) is arranged, which the

30 The outlet (16) of the pump (10) releases or opens briefly during operation.

8. Device according to one of claims 3 to 7, characterized in that 35 that both the inlet (13, 14) and the outlet (16) open axially into the pump housing (11, 11 '). - -

9. The device according to claim 6, so that the outlet (16) lies in the region of the movement circle of the axial opening (18) arranged in the pulsator disk (17).

10. Device according to one of claims 8 or 9, characterized in that the inlet and outlet on the axially opposite boundary walls (11, 11 ') of the pump housing and diametrically to the engagement or sealing area of the gears (20, 20') are arranged.

11. The device, in particular according to one of claims 1 to 10, characterized in that a liquid cartridge (32) can be connected in the region of the connection (15) leading to the pump inlet (13) on the pump housing (11), in particular by means of a bayonet lock (33).

12. The device, in particular according to one of the preceding claims, that all parts of the pump, possibly with the exception of the drive pin (12), are made of plastic, in particular of polyethylene.