Patent Application Titled "Lid Apparatus for the Pivotable Support of a Lid on a Medical Device for Extracorporeal Blood Treatment; Medical Device for Extracorporeal Blood Treatment with Lid Apparatus
No assignee for this patent application has been made.
Reporters obtained the following quote from the background information supplied by the inventors: "In medical devices for extracorporeal blood treatment (Dialysis), peristaltic pumps are often used which supply the blood removed from the patient to a dialyzer and return the blood to the patient. Such pumps operate peristaltically, wherein a tube segment in the form of a loop lies on a correspondingly curved running surface. In that case, a pump's rotor lying inside the running surface moves with its outer edges along the tube segment, whereby it presses locally on the tube and thus, together with the elastic material properties of the tube segment, it allows a blood supply through the tube segment. Therefore the blood is introduced into the tube segment via a first connection and conducted away via a further connection at the other end of the tube segment. Thus for example the tube segment forms, together with the supply and discharge lines and the plurality of air traps, a so-called transfer system, with which the blood of the patient is supplied to a dialyzer and then supplied back to the patient."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventor's summary information for this patent application: "An object of aspects of the invention is therefore to provide a lid apparatus for a medical device for extracorporeal blood treatment with which a lid is latchable in at least one position with respect to a component of the medical device, wherein the lid apparatus is easy to assemble and leads to the minimum possible signs of wear during service.
"A further object of aspects of the invention is to provide a medical device for extracorporeal blood treatment comprising such a lid apparatus, wherein the lid apparatus is to be suited in particular to cover a peristaltic pump of a medical device for extracorporeal blood treatment.
"The lid apparatus according to aspects of the invention for a medical device for extracorporeal blood treatment comprises a lid which is hinged at the medical device via at least one pivot joint. In this way, the pivot joint comprises a first joint section and a second joint section. The joint sections are pivotable with respect to each other about an axis of rotation at least between a first position in which the lid is open, and a second position, in which the lid covers at least a part of the medical device, and are releasably lockable or latchable in at least one pivoting position.
"The first joint section may be positioned at the lid, and the second joint section may be connectable to the medical device.
"The lid apparatus further comprises at least one pair of contact surfaces which, perpendicular to the axis of rotation, are resiliently biased against each other, wherein at least one of the contact surfaces comprises a rolling and latching geometry which is configured such that the lid latches in the second position, and the pivoting moveability of the pivot joint is only released when the resilient biasing force is overcome.
"By means of the resilient biasing load, it is achieved that the contact surfaces of the lid apparatus always press against each other or roll or unload against each other during the relative rotation of the joint sections. The pivot point of the pivot joint changes by means of the rolling and latching geometry relative to the medical device or lid. In the second, or latched, position the latching geometry, e.g. a flattened portion, comes into contact with the contact surface at the other component, whereby the relative distance of the pivot axis shortens with the aid of the spring biasing load. In order to bring the pivot joint from the latched position back into a non-latched, or pivoting, position, i.e. in order to bring the rolling geometry, e.g. a circular arced surface, into contact with the contact surface on the other component and thus to increase again the relative distance of the pivot axis, the applied resilient biasing load must be overcome. If this predetermined force is not applied, the lid remains independently in the latched position.
"According to aspects of the invention, the medical device may comprise a housing section with at least one retention system which includes a lid support as the second joint section, which is movable with respect to the medical device under the load of a spring. The lid is pivotably mounted about an axis of rotation at said lid support, wherein a pulling force can be applied to the lid by the spring loaded lid support. The contact surface comprising the rolling and latching geometry may be configured at the first joint section positioned at the lid. The rolling and latching geometry may include a latching surface, or flattened portion, and at least one convex rolling curve, wherein the rolling curve borders on the latching surface on one side. In the latched position of the lid, the latching surface contacts the other contact surface of the pair of contact surfaces, while the rolling curve slides, upon pivoting of the lid, from the latched position along the other contact surface of the pair of contact surfaces.
"The latching surface is configured with respect to the rolling curve such that the lid, after passing through the rolling curve, latches on the latching surface. Here the latching surface may itself be formed in different ways. For example, this may involve a planar surface, or the latching surface may comprise a waved or jagged outer surface. In particular a concave latching surface has proved to be advantageous here.
"The latched position of the lid may involve an opened or closed position of the lid relative to the medical device. For example the lid is latchable in the opened position in order to allow an operator access to the medical device, without the lid being able to pivot back by itself to the closed position, because this could, where appropriate, disturb actions of the operator at the second component. In this embodiment, the lid in the latched position does not therefore cover the medical device. However there are also conceivable applications in which a lid is to be latched in a closed position so that it does not open accidentally.
"The latching is essentially caused by the pulling force which may constantly pull the lid support, and with it also the rolling and latching geometry, against the second component. In the latched position, the latching surface of the rolling and latching geometry bears on the second component and the lid can only be pivoted by a defined force from this latched position, because the spring force must be overcome in order to rotate the rolling and latching geometry such that a convex rolling surface can now slide on the other contact surface of the pair of contact surfaces. Depending on the shape of the rolling and latching geometry, it may also be achieved that the lid is secured in this second position as well.
"In an exemplary embodiment of the invention, the retention system includes a plain bearing bush within which the lid support is axially movably mounted, wherein the plain bearing bush is fixed in a housing section of the medical device. The retention system can easily be pressed via the plain bearing bush, for example, into a hole in the housing section. In this way, in one embodiment of the invention, the lid support is cylindrically shaped, which brings with it the advantage that it is also movable in the circumferential direction inside the plain bearing bush. This simplifies in particular the assembly of the retention system because it does not have to be aligned to the housing section. Rather, the plain bearing bush with the lid support located inside it can be easily mounted in a hole in the housing section and the lid support can then be rotated inside the mounted plain bearing bush such that the lid can be attached to it. In order to simplify the connection of the lid with the lid support, it may however be provided that the lid support is formed to be plate-shaped in the region of the bearing for the lid. Thus for example it can be inserted into a corresponding hole with a rectangular cross section, whereby an orientation of the lid support in the lid in the circumferential direction can be realised. By means of this defined orientation, the insertion of a hinge pin through a hole in the lid support, for example, is simplified.
"In an embodiment of the invention, the lid support protrudes with two ends lying opposite each other from the plain bearing bush, wherein a bearing for the lid is configured at one end, while at the other end the lid support comprises a stop, and the retention system further includes a compression spring which surrounds the lid support and is biased between the stop and the plain bearing bush. Through this construction of the retention system, the pull force on the lid can be realised, since the biased compression spring pushes the stop away from the plain bearing bush, whereby on the other side, the bearing of the lid support and with it the attached lid are constantly pulled in the direction of the plain bearing bush. However the pull force on the lid support may also be created by other spring loaded constructions.
"In one embodiment, the other contact surface of the pair of contact surfaces may be formed by the outer surface of the housing section of the medical device. In that case, the latching surface, in the latched position of the lid, lies on the outer surface and the at least one rolling curve slides, upon pivoting of the lid, from the latched position along the outer surface.
"The dimensions of the rolling and latching geometry and of the retention system may be chosen such that the latching surface in the latched position of the lid bears on the plain bearing bush, and the at least one rolling curve slides, upon pivoting of the lid, from the latched position along the plain bearing bush. In other words, the rolling and latching geometry at a joint section on one side and the abutting face of the plain bearing bush on the other side form a pair of contact surfaces which are resiliently biased against each other. This has the advantage that signs of wear do not occur on the material of the housing section, since stress and friction by the lid act only on the retention system and not on the material of the housing section. To this end, the material of the plain bearing bush may for example be chosen such that it resists this stress without impairment. In particular the plain bearing bush may be formed from a more resistant material than the housing section itself, which can simplify the design of components, for which the lid apparatus according to the invention is used.
"However it may also be provided that the latching surface, in the latched position of the lid, bears at least partly on the housing, and that the at least one rolling curve slides, upon pivoting of the lid, from the latched position at least partly along the housing.
"In a further embodiment of the invention, the rolling and latching geometry may comprise two convex rolling curves which border the latching surface on opposite lying sides. Thus an overload protection may be achieved in the latched position because, upon pivoting of the lid over the latched position, the rolling and latching geometry rolls onto the other contact surface in a controlled manner without damage arising. Such pivoting is made difficult by the spring force, but is not impossible, such that for example an unintentional pivoting of the lid does not lead to fracture or bending of components.
"An edge may be configured between the at least one rolling curve and the latching surface. The latching surface therefore does not pass evenly into the rolling curve, rather an edge must first be overcome upon pivoting out of the latched position.
"The lid may for example be mounted to the lid support by a hinge connection. In this way a hinge hole may be provided in the lid, through which the axis of rotation passes. In that case at least one second hole passes transversely through this hinge hole, wherein the lid support is inserted in the second hole such that a pin support of the lid support lies inside the hinge hole and is penetrated by a hinge pin which is inserted in the hinge hole. The hinge pin connects the lid and the lid support via a clearance fit, which allows an easy assembly and also makes the service at the lid apparatus very easy.
"The hinge pin may thereby be axially fixed inside the hinge hole in order to ensure it against falling out. This may for example be realised by means of a circumferential groove on the hinge pin, in which a raised portion in the lid engages into the end of the hinge pin inside the associated hinge hole. However other types of latching geometries may also be provided wherein the constantly applied spring force which acts transversely to the hinge pin, supports the axial fixing of the hinge pin.
"In addition, the lid may be attached to the medical device with one or more retention systems. For example at least two retention systems may be provided which pivotably mount a lid on two sides.
"The invention also includes a medical device for extracorporeal blood treatment comprising such a lid apparatus. The lid apparatus according to the invention is also suited for the covering of various components of a medical device for extracorporeal blood treatment, wherein a lid is to be held in a certain position with respect to a component. In particular, the lid apparatus has proven to be advantageous for components which require a repeated manual actuation but are to be protected from external influence between the actuation phases. This is the case in peristaltic pumps in dialysis machines for example, because here single-use tube segments must be repeatedly installed and removed.
"In an embodiment of the invention, a medical device for extracorporeal blood treatment includes at least one peristaltic pump having a pump housing which comprises a curved running surface and a rotor that rotates inside the running surface, wherein a tube segment of an extracorporeal blood circuit is introduceable between the running surface and the rotor. The peristaltic pump includes in addition a lid apparatus according to the invention, wherein the pump housing in the closed position is at least partially coverable by the lid.
"In addition the latching can, for example, also be used to hold the lid in an open position such that an operator has access to the pump housing and can set up or dismantle the rotor and/or a tube segment, without the lid accidentally pivoting back into its closed position. In this way in particular the requirements for a one-hand operation for inserting and removing the transfer system are fulfilled.
BRIEF DESCRIPTION OF THE DRAWINGS
"The invention is best understood from the following detailed description when read in connection with the accompanying drawings. Included in the drawings are the following figures:
"FIG. 1 a schematic illustration of a medical device for extracorporeal blood treatment with a blood pump;
"FIG. 2 a schematic illustration of a view on a peristaltic pump;
"FIG. 3 a schematic side view on a peristaltic pump with opened lid;
"FIG. 4 a schematic side view on a peristaltic pump with closed lid;
"FIG. 5a an enlarged view of a retention system with opened lid;
"FIG. 5b a retention system according to FIG. 4b in the process of closing;
"FIG. 5c a retention system according to FIG. 4b with closed lid;
"FIG. 6 a retention system during assembly to the pump housing; and
"FIG. 7 a partial view of a retention system with assembled lid."
For more information, see this patent application:
Keywords for this news article include: Patents, Treatment.
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