Hose clamp for a blood treatment device

Abstract

Hose clamp for a blood treatment device, wherein the hose clamp comprises a housing (4) and an electromechanically driven pressure piece (1), wherein the electromechanical drive of the pressure piece (1) is configured such that the pressure piece (1) is opened against a mechanical restoring force (A) when the hose clamp is energized and is closed by the mechanical restoring force (A) when the hose clamp is de-energized, and wherein the hose clamp additionally comprises a mechanical actuator (5) with which the pressure piece (1) can be manually opened against the mechanical restoring force (A) when the hose clamp is de-energized, characterized in that the contact elements (6, 7) of the actuator (5) and the pressure piece (1) are configured such that, after the pressure piece (1) has been opened in the de-energized state, they form a mechanical connection between the actuator (5) and the pressure piece (1).which prevents the pressure piece (1) from closing again when the hose clamp is de-energized by the mechanical restoring force (A), and which is released when the hose clamp is energized.

Description

[0001] The invention relates to a hose clamp for a blood treatment device, a blood treatment device with such a hose clamp, and a method for removing and / or inserting a hose set from or into such a blood treatment device.

[0002] As a safety feature, blood treatment devices have a hose clamp used to clamp off a tube of the extracorporeal blood circulation. The clamp allows the patient to be disconnected from the extracorporeal blood circulation during treatment, particularly to prevent blood loss. For safety reasons, it is known to design the clamp so that it closes in the event of a power outage, such as a power failure, thus disconnecting the patient from the extracorporeal blood circulation.

[0003] In the conventional three-shift operation of blood treatment centers and, for example, dialysis centers, the devices are prepared for the following day after the last treatment in the evening, and the tubing set serving as an extracorporeal blood circulation is inserted.

[0004] Since the device is regularly unplugged overnight, the clamp clamps the hose for extended periods. This leads to permanent compression of the hose, causing irreversible deformation in the affected area. This can result in undesirable turbulence during operation.

[0005] The aim of the invention is to avoid this disadvantage.

[0006] Against this background, the invention relates to a hose clamp for a blood treatment device, comprising a housing and an electromechanically driven pressure piece. The electromechanical drive of the pressure piece is designed such that, when the hose clamp is energized, it opens against a mechanical restoring force, and when the hose clamp is de-energized, it closes due to the mechanical restoring force. In addition to the electromechanical drive, the hose clamp has a mechanical actuator with which the pressure piece can be manually opened against the mechanical restoring force when the hose clamp is de-energized.According to the invention, the contact elements of the actuator and the pressure piece are designed such that, after the pressure piece has been opened in the de-energized state, they form a mechanical connection between the actuator and the pressure piece, which prevents the pressure piece from closing again in the de-energized state of the hose clamp due to the mechanical restoring force, and which is released when the hose clamp is energized.

[0007] In one embodiment, one contact element, preferably the pressure-piece-side contact element, is a projection, and the other contact element, preferably the actuator-side contact element, is a guide track. The guide track is designed such that the projection moves along it when the actuator is actuated. Furthermore, at a saddle point where the projection is located in an open position of the pressure piece, the guide track includes a detent contour for the projection. The guide track can, for example, be an edge of the actuator or a cam track in the actuator or in the pressure piece.

[0008] In one embodiment, the actuator is a pivotable lever, with the guide track preferably being arranged on a side edge of the lever arm.

[0009] In one embodiment, the guide track is at least partially convex and preferably semicircular.

[0010] In one embodiment, a stop contour is located at the end of the guide track. Preferably, the stop contour is located beyond the saddle point. The stop contour limits the maximum opening of the pressure piece that can be achieved by the actuator. For example, the stop contour can be a linear section of the guide track that has a different slope than the sections located before the saddle point.

[0011] In one embodiment, the projection is a pin that is preferably perpendicular to the closing direction of the pressure piece. The pin can, for example, be rotatably mounted on the pressure piece or on the actuator so that it rolls along the guide track, or be fixedly mounted so that it slides along the guide track.

[0012] In one embodiment, the detent contour is a recess in the guide track and / or a step on the guide track. The recess can, for example, be a circular indentation in the guide track at the saddle point, where the radius of the circular indentation can, for example, correspond to the radius of the pin.

[0013] In one embodiment, the hose clamp has a mechanical spring, preferably a mechanical tension spring, connected to the actuator and the housing, which exerts a restoring force on the actuator against its direction of actuation when the pressure piece is opened.

[0014] Against the background mentioned above, the invention further relates to a blood treatment device, preferably a dialysis device with an extracorporeal blood circulation, which has a line section designed as a tube, wherein the line section preferably forms part of the arterial or venous line of the extracorporeal blood circulation. According to the invention, a tube clamp according to the invention is arranged on the line section designed as a tube.

[0015] The dialysis machine could, for example, be a device for performing hemodialysis, hemodiafiltration and / or hemofiltration.

[0016] The hose is preferably made of plastic and may, for example, have a round cross-section.

[0017] The arterial line runs upstream of the treatment unit, and the venous line downstream of the treatment unit, for example, the dialyzer of the dialysis machine. Depending on the position of the line segment, the clamp attached to it is either an arterial or a venous clamp. Preferably, the line segment and the clamp are located near the arterial or venous port to which the patient is connected to the circulatory system.

[0018] The extracorporeal blood circulation can, of course, have several tubular sections, and the blood treatment device can, of course, have several identical or differently designed clamps that engage one or more of these tubular sections. The essential feature of the invention is that at least one tubular section is present, on which at least one clamp according to the invention is arranged.

[0019] In one embodiment, the extracorporeal blood circulation has two tubing sections, one of which forms part of the arterial and the other part of the venous supply of the extracorporeal blood circulation. In this embodiment, the blood treatment device may be provided with two tubing clamps according to the invention, one of which is arranged on one of the tubing sections and the other on the other tubing section.

[0020] Furthermore, in light of the aforementioned background, the invention relates to a method for removing and / or inserting a tubing set from or into a blood treatment device according to the invention. The tubing set forms at least a part of the extracorporeal blood circulation and comprises the section of tubing on which the tubing clamp according to the invention is arranged. According to the invention, the pressure piece is opened by actuating the actuator in the de-energized state, and the tubing set is then removed and / or inserted into the tubing clamp while the pressure piece remains de-energized, with the mechanical connection between the actuator and the pressure piece holding it open.

[0021] Removing and inserting the hose set together constitutes replacing the hose set.

[0022] In this way, for example, the tubing set in a dialysis center can be replaced or inserted the evening before, and the dialysis machine can still remain without power overnight without the tubing set being pinched and possibly deformed or damaged.

[0023] Further details and advantages of the invention will become apparent from the known and inventive systems explained below with reference to the figures. The figures show:

[0024] Fig. 1: a sectional view of a hose clamp from the prior art in its de-energized and closed state;

[0025] Fig. 2: a sectional view of the in Fig. 1 hose clamp shown in the still de-energized but manually opened state; and

[0026] Fig. 3: a sectional view of a hose clamp according to the invention in the de-energized but manually opened state.

[0027] Fig. 1 and Fig. Figure 2 shows a previously known hose clamp of a dialysis machine from the prior art.

[0028] The hose clamp includes a movable pressure piece. 1 and a stationary saddle 2 There is a notch in between. 3 designed to accommodate a plastic tube, for example a plastic tube that forms part of an extracorporeal blood circulation of a dialysis machine.

[0029] The printing piece 1 is inside the terminal housing 4The clamp is mounted in a vertically displaceable manner (directions or positions such as "vertical", "horizontal", "top", "bottom", etc. refer to the illustration shown and not to the actual installation position of the hose clamp in the blood treatment device). The vertical displacement of the pressure piece is controlled by an electromechanical system not shown in detail in the figures. This electromechanical system comprises, on the one hand, a mechanical compression spring which moves the pressure piece. 1 downwards (direction A) into the Fig. The closed position shown in section 1 is pressed. Furthermore, the electromechanical system includes an electromagnet that presses the pressure piece. 1 When energized, the terminal is pulled upwards (direction B) against the restoring force of the mechanical compression spring. The opening force exerted by the electromagnet is greater than the closing force exerted by the mechanical compression spring. The open state of the terminal, resulting from energizing the electromagnet, is not shown in the figures.

[0030] In addition to raising the pressure piece 1 Furthermore, the pressure piece can be manually lifted by energizing the electromagnet. 1 by operating a pivoting lever 5 possible. The lever 5 engages through a breakthrough in the pressure piece 1 through and includes a guide track 6 , which with a pen 7 interacts, which is attached to the pressure piece 1 is molded or attached. The lever 5 can be moved from a horizontal rest position by manual operation around an axis C while overcoming a mechanical counterforce ( Fig. 1) into an elevated position ( Fig. 2) be pivoted. The mechanical counterforce is provided, on the one hand, by the tension spring. 8 exercised, which between the terminal housing 4 and an extension 9 of the lever 5is arranged, and secondly by the restoring force that acts on the pressure piece 1 acts and based on the contact elements 6 and 7 to the lever 5 The actuating element for manually pivoting the lever, located in the extension of axis C and which could be, for example, a rotary knob or a handle lever, is not shown in detail in the figures and is enclosed by the housing. 4 concealed.

[0031] The guideway 6 includes a convex bulge on the upper side of the lever arm 10 as well as a straight end section running parallel to the direction of the lever arm 11 The saddle point is located between the convex bulge and the straight section. 12 .

[0032] In the initial, de-energized state of the hose clamp according to Fig. The lever is located at position 1. 5in its resting state. Should a hose be removed from the intake in this state? 3 be removed or a hose inserted into the intake 3 When inserted, the pressure piece can be used. 1 It can be raised by operating the lever. In the starting position, the lever 5 through the tension spring 8 held in a horizontal position. The pen 7 of the printed piece 1 lies approximately in the middle of the convex guide track 6 up. Starting from this position, the lever 5 By manual operation, it is swivelled upwards, moving along the guide track. 6 resting pin 7 and thus the pressure piece 1 The clamp is lifted against the mechanical spring force A. The maximum amplitude of this mechanical lifting or opening of the clamp is reached when the pin is at the saddle point. 12 of the lever 5has arrived and a further lift is prevented by the abrupt change in the slope of the guideway. 6 is no longer possible.

[0033] Due to the restoring force of the tension spring directed towards D 8 and through the pen 7 via the guideway 6 to the lever 5 transmitted restoring force of the pressure piece 1 In direction A the lever 5 After releasing the manual counterforce, it automatically swivels back into its horizontal starting position.

[0034] The lever is responsible for the mechanical closing of the terminal when de-energized. 5 So, unless it's being used, it has no effect.

[0035] Fig. Figure 3 shows a sectional view of a hose clamp according to the invention in the de-energized and manually opened state, as shown in Fig. Figure 2 shows the hose clamp from the state of the art.

[0036] In contrast to the hose clamp of the prior art, according to the invention, at the saddle point 12 of the lever 5 a grid contour in the form of a depression 13 in the management track 6 arranged. The depression 13 In the illustrated embodiment, it is semicircular, wherein the radius of the semicircle corresponds to the outer radius of the pin. 7 corresponds.

[0037] If the pen 7 when manually lifting the pressure piece 1 ran along the guide track until the saddle point 12 Once reached, the pen lowers. 7 in this depression. This prevents the pen from slipping back. 7 along the guideway 6 prevented, since the forces acting in directions A and D... 7 against the side surface of the depression 13 Pressing, which leads to a wedging or locking of the pressure piece. 1 with the lever5 This prevents the lever from swinging back. 5 into its horizontal resting position and a lowering of the pressure piece 1 in the direction of A.

[0038] Of course, in addition to the shaping shown... 13 other resting devices such as a step on the guide rail 6 conceivable.

[0039] In summary, the locking contour ensures that the hose clamp remains open after mechanical opening of the clamp in the de-energized state.

[0040] This is due to the resting contour 13 The resulting blockage is automatically released when the terminal is energized, without any further manual intervention. This is because the pressure piece is released when the terminal is energized. 1 starting from the in Fig.In position 3 shown, the hose clamp is raised further and opened slightly more. This magnetic lifting, beyond the mechanical lifting, engages the locking mechanism between the pin. 7 and the rest contour 13 released, and the lever 5 is caused by the tensile force of the spring 8 The hose clamp pivots back to its starting position (horizontal) in direction D. Therefore, in operation, the function of the hose clamp according to the invention is identical to the function of the clamp from the prior art.

[0041] In summary, the inventive idea consists of providing the hose clamp with a holding and, in particular, a locking function that can be manually activated, for example, in the evening, so that the extracorporeal circulation hose is not clamped overnight despite the power being off. The locking function can be deactivated when the device is started the next day. During the course of treatment, the clamp can then clamp the hose when the dialysis machine is without power, as is known from the prior art.

Claims

[1] Hose clamp for a blood treatment device, the hose clamp having a housing ( 4 ) and an electromechanically driven thrust piece ( 1 ) has, wherein the electromechanical drive of the pressure piece ( 1 ) is designed in such a way that the pressure piece ( 1 ) is opened against a mechanical restoring force (A) when the hose clamp is energized and closed by the mechanical restoring force (A) when the hose clamp is de-energized, and the hose clamp has a mechanical actuator ( 5 ) with which the pressure piece ( 1 ) can be opened manually against the mechanical restoring force (A) when the hose clamp is de-energized, characterized, that the contact elements ( 6 , 7 ) of the actor ( 5 ) and the pressure piece ( 1 ) are designed in such a way that after the pressure piece ( 1 ) in the de-energized state, a mechanical connection between the actuator ( 5 ) and the pressure piece ( 1 ) that cause the pressure piece ( 1 ) prevented by the mechanical restoring force (A) when the hose clamp is de-energized, and is released when the hose clamp is energized. [2] hose clamp according to claim 1, characterized, that it is a contact element ( 6 , 7 ), preferably with the contact element on the pressure piece side ( 7 ) by a lead ( 7 ) and that the other contact element ( 7 , 6 ), preferably with the actuator-side contact element ( 6 ) around a guideway ( 6 ) acts, whereby the guideway ( 6 ) is formed so that the projection ( 7 ) when actuating the actuator ( 5 ) moved along it, and wherein the guideway ( 6 ) at a saddle point ( 12 ), on which there is a projection ( 7 ) in an open position of the pressure piece ( 1 ) is located, a locking contour ( 13 ) for the projection ( 7 ) includes. [3] Hose clamp according to one of the preceding claims, characterized, that the actor ( 5 ) around a pivotable lever ( 5 ) is, preferably the guideway ( 6 ) on a side edge of the lever arm ( 10 ) is arranged. [4] hose clamp according to claim 2 or 3, characterized, that the guideway ( 6 ) is at least partially convex and preferably part-circular. [5] hose clamp according to one of claims 2 to 4, characterized, that the projection ( 7 ) around a pin ( 7 ) acts, which is preferably normal to the closing direction (A) of the pressure piece ( 1 ) stands. [6] hose clamp according to one of claims 2 to 5, characterized, that the latching contour ( 13 ) by an indentation ( 13 ) in the guideway ( 6 ) and / or one step on the guideway ( 6 ) acts. [7] Hose clamp according to one of the preceding claims, characterized, that the hose clamp is connected to the actuator ( 5 ) and the housing ( 4 ) associated mechanical spring ( 8 ) and preferably tension spring ( 8 ) includes a restoring force (D) on the actuator ( 5 ) against its direction of actuation when opening the pressure piece ( 1 ) exercises. [8] Blood treatment machine, preferably a dialysis machine with an extracorporeal blood circuit, which has a line section designed as a hose, the line section preferably forming part of the arterial or venous line of the extracorporeal blood circuit, characterized, that a hose clamp according to one of the preceding claims is arranged on the line section designed as a hose. [9] Blood treatment device according to claim 8, characterized,that the extracorporeal blood circuit has two line sections designed as hoses, one of these line sections forming part of the arterial line and the other of this line section forming part of the venous line of the extracorporeal blood circuit, and that the blood treatment device has two hose clamps, one of these hose clamps being on one of these line sections and the other of the hose clamps is arranged on the other of said line sections, both hose clamps being hose clamps according to any one of claims 1 to 7. [10] Method for removing and / or inserting a tube set from or into a blood treatment device according to one of claims 8 or 9, wherein the tube set forms at least part of the extracorporeal blood circuit and comprises the line section on which the tube clamp according to one of the claims 1 to 7 is arranged, characterized, that the pressure piece ( 1 ) in the de-energized state by actuating the actuator ( 5 ) is opened and the tubing set is then removed from the tubing clamp and / or inserted while the pressure piece ( 1 ) through the mechanical connection between the actuator ( 5 ) and the pressure piece ( 1 ) is kept open.

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