Component arrangement for a medical device

Abstract

The invention relates to a component arrangement for a medical device, comprising a first component with an inner side, an outer side and a recess extending between the inner side and the outer side, and with at least one screw receptacle arranged in the recess and set back from the outer side by an axial distance in the direction of the inner side, a second component having a screw dome with an elongated dome shaft and a bore, wherein the second component is arranged on the outer side of the first component and the dome shaft projects axially into the recess, and a screw with a screw shaft having a thread and with a screw head, wherein the screw shaft is screwed into the bore and the screw head is supported axially on the screw receptacle, whereby the first component is screwed to the second component.The invention also relates to a medical device with such a component arrangement.

Description

[0001] The invention relates to a component arrangement for a medical device, in particular a dialysis machine.

[0002] Medical devices, such as dialysis machines, typically have a housing composed of several components, with screw connections often being used to join the components. For plastic components, so-called plastic direct screw connections are commonly used. Such screw connections comprise a screw boss into which a screw with a self-tapping thread is screwed.

[0003] In conventional medical devices, the screw boss of a direct screw connection is installed inside the plastic component to secure it to a sheet metal interface, beneath a flat sheet of metal. The entire length of the screw boss for the direct screw connection is incorporated into a highly bulky structure that is visually unattractive to the user.

[0004] DE 10 2017 104 384 B4 discloses a component with a screw boss for receiving a screw. The screw boss protrudes from the component and is integrally connected to it. The screw boss has a cavity surrounded by a wall, which is open toward the screw insertion side. The screw boss has stiffeners between which there is a partial weakening of the wall.

[0005] From DE 10 2007 048 298 A1 a fastening device is known, comprising at least one dome formed on a plastic housing, over which a pin formed integrally with the same projects, wherein the end of the pin serves to fix an element to be attached to the fastening device, and the pin has a shoulder which serves as a contact surface for the element to be attached to the fastening device, wherein at least in the central region of the pin a cutout or recess is provided which extends below the contact surface formed by the shoulder.

[0006] The object of the invention is to provide a component arrangement for a medical device that offers advantages over the prior art. In particular, the component arrangement should enable a flat design within the user's field of vision.

[0007] This object is achieved by providing a component arrangement having the features of claim 1. Advantageous further developments are specified in the subclaims. The wording of the claims is incorporated into the description by reference.

[0008] The component arrangement according to the invention comprises a first component, a second component, and at least one screw. The first component has an inner side, an outer side, and a recess. The recess extends between the inner side and the outer side. The first component further comprises at least one screw receptacle, which is arranged in the recess and is set back from the outer side by an axial distance in the direction of the inner side. The second component has a screw dome with an elongated dome shaft and a bore, wherein the second component is arranged at least in sections on the outer side of the first component, and the dome shaft projects axially into the recess.The screw has a screw shaft with a thread and a screw head, wherein the screw shaft is screwed into the bore and the screw head is axially supported on the screw receptacle, whereby the first component is screwed to the second component. In one embodiment, the domed shaft projects axially through the recess beyond the inside of the first component. In a further embodiment, the screw shaft is screwed through the screw receptacle into the bore. In a further embodiment, the first component and the second component are each a housing component of the medical device. The second component can be, for example, a front panel, a cover or a panel.

[0009] The component arrangement according to the invention offers various advantages over the prior art. In particular, the geometric design of the first component and the second component allows for a slimmer or even flatter design of the second component compared to established design rules.

[0010] In one embodiment of the invention, the axial distance corresponds at least substantially to an axial length of the dome shank. This makes it possible to achieve a particularly flat structure. In this case, one front end of the screw dome is preferably supported axially on the screw receptacle or rests against it, so that no axial gap forms either between the front end of the screw dome and the screw receptacle or between the outer side of the first component and an inner side of the second component in the area outside the recess. In one embodiment, the axial distance is greater than the length of the dome shank, as a result of which an axial gap forms between the front end of the screw dome and the screw receptacle. The axial gap ensures a favorable flow of force in that the screw shank and the screw dome are subjected to axial tensile stress and the screw head presses axially against the screw receptacle.This causes the second component to be pulled / pressed axially against the outside of the first component.

[0011] In a further embodiment of the invention, the first component is a sheet metal component, and the at least one screw receptacle is arranged on a tab. The tab is formed by a bent section of the sheet metal component. This enables simplified production. In one embodiment, the tab can be formed on a nibbling machine using a tab-forming tool.

[0012] In one embodiment of the invention, the screw receptacle is provided with at least one recess for receiving the screw shaft. In one embodiment of the screw receptacle, the recess is radially closed. In another embodiment of the screw receptacle, the recess is radially open. The recess can be a cylindrical bore, an elongated hole, or the like. The recess can be introduced into the first component by drilling, milling, punching, laser cutting, or the like.

[0013] In a further embodiment of the invention, the first component is provided with at least two screw receptacles, wherein the screw receptacles are formed on at least two circumferential sides of the recess. In one embodiment, the screw receptacles are formed on two opposite circumferential sides of the recess.

[0014] In a further embodiment of the invention, the first component has a plurality of positioning elements, and the second component has a plurality of complementary positioning receptacles. The positioning elements each engage positively in one of the positioning receptacles, thereby aligning the two components in a predetermined position. This prevents assembly errors and consequential damage. In one embodiment, the positioning elements also have a holding function. This further simplifies assembly. In one embodiment, the second component has a plurality of positioning elements, and the first component has a plurality of complementary positioning receptacles.

[0015] In a further embodiment of the invention, the second component is made of a plastic material. In one embodiment, the second component is injection-molded. In another embodiment, the first component is also made of a plastic material, specifically injection-molded.

[0016] In a further embodiment, the screw thread is self-tapping. Self-tapping means that the screw thread forms its own counter-thread when screwed into the boss shaft, specifically by grooves and / or cutting. Therefore, the counter-thread does not need to be incorporated into the screw boss in a separate manufacturing step. This design is particularly advantageous when the second component is made of a plastic material.

[0017] In a further embodiment, the screw is provided with a washer that is positively and / or non-positively connected to the underside of the screw head. The washer is thus arranged axially between the screw head and the screw receptacle. The dimensions and / or material properties of the washer can positively influence the properties of the screw connection.

[0018] The invention also relates to a medical device with a component arrangement according to the above description. Specifically, the medical device is a dialysis machine for extracorporeal blood treatment.

[0019] Further advantages and features of the invention emerge from the claims and from the following description of preferred embodiments of the invention, which are illustrated with reference to the drawings. Fig. 1 shows a schematic perspective view of an embodiment of a medical device according to the invention in the form of a dialysis machine with a housing which has an embodiment of a component arrangement according to the invention, Fig. 2 in a partially cut-off, schematic side view of the mentioned component arrangement of the medical device according to Fig. 1, Fig. 3 a longitudinal section of the component arrangement according to Fig. 2 in the area of ​​a screw dome, Fig. 4 in a schematic perspective view a first component with an embodiment of a screw receptacle and Fig. 5 in one of the Fig. 4 shows the first component with a further embodiment of a screw receptacle.

[0020] According to Fig. 1, a medical device 1 in the form of a dialysis machine 2 is provided for use in extracorporeal blood treatment. The dialysis machine 2 has a function that is generally known to a person skilled in the art, so that related features of the dialysis machine 2 need not be discussed further.

[0021] The dialysis machine 2 has a housing G. The housing G comprises a component arrangement A (in Fig. 1 is not apparent), as described in detail in the Fig. 2 and Fig. 3 is shown.

[0022] The component arrangement A comprises a first component 10, a second component 20 and a screw 40.

[0023] The first component 10 and the second component 20 are screwed together in a manner described in more detail below. In the illustration of the embodiment according to Fig. 2, only one screw is shown. The number is purely exemplary and can be any number, for example, two, four, or six. The further features of component arrangement A are explained below with reference to one / the screw 40. For the other screws not shown, the statements regarding screw 40 generally apply analogously.

[0024] The first component 10 has an inner side 11, an outer side 12, a recess 13, and at least one screw receptacle 16. The outer side 12 faces an environment. The inner side 11 faces an interior of the housing G and / or faces away from the environment. The recess 13 extends between the inner side 11 and the outer side 12. The screw receptacle 16 is arranged in the recess 13 and is set back from the outer side 12 by an axial distance B in the direction of the inner side 12 (see in particular Fig. 2).

[0025] The Fig. The screw receptacle 16 shown in Fig. 4 extends over an entire length of a circumferential side 18 of the recess 13.

[0026] In embodiments not shown, one screw receptacle 16 extends over a partial length of the circumferential side 18 of the recess 13.

[0027] The Fig. The screw receptacles 16 shown in Figure 5 each extend over a partial length of the circumferential side 18 of the recess 13 and are evenly spaced from one another.

[0028] In embodiments not shown, the screw receptacles 16 are unevenly spaced from one another.

[0029] The first component 10 is located in the Fig. 4, a total of two screw receptacles 16 arranged on opposite circumferential sides 18 of the recess 13 and in the embodiment shown in Fig. In the embodiment shown in Figure 5, a total of six screw receptacles 16 are provided, arranged on opposite circumferential sides 18 of the recess 13, whereby only a portion of the screw receptacles 16 are shown in the figures. The number shown is to be understood as purely exemplary.

[0030] In embodiments not shown, the screw receptacles 16 are formed on at least two circumferential sides 18 of the recess 13 that adjoin one another, for example at a corner.

[0031] In embodiments not shown, one or more screw receptacles 16 are arranged on only one of the circumferential sides 18 of the recess 13. A different type of fastening can be provided on the circumferential side 18 opposite the at least one screw receptacle 16. This can be, for example, a different type of screw connection, a tongue and groove connection, or the like.

[0032] In the embodiment shown, the second component 20 is made of a plastic material K. In this case, it is manufactured by injection molding. Other manufacturing methods are also conceivable and possible, for example, additive manufacturing, specifically by 3D printing, or machining, such as milling.

[0033] The second component 20 has a screw dome 21 with an elongated dome shaft 22 and a bore 23. The second component 20 is arranged on the outer side 12 of the first component 10. The dome shaft 22 protrudes axially into the recess 13 and beyond the inner side 11 of the first component 10.

[0034] The screw 40 has a screw shaft 41 with a thread 42 and a screw head 43. The screw shaft 41 is screwed through the screw receptacle 16 into the bore 23. When the screw 40 is screwed in, the self-tapping thread 42, in this case, cuts its own counter-thread into the bore 23. In designs with a non-self-tapping thread, the counter-thread is pre-cut. The screw head 43 is axially supported on the screw receptacle 16.

[0035] In embodiments not shown, the screw 40 is provided with a washer which is positively and / or non-positively connected to an underside of the screw head 43.

[0036] The axial distance B corresponds in this case to an axial length of the dome shaft 22 (see in particular Fig. 3). As a result, a front end 25 of the screw boss 21 is axially supported on the screw receptacle 16, so that no axial gap forms either between the front end 25 of the screw boss 21 and the screw receptacle 16 or between the outer side 12 of the first component 10 and an inner side 26 of the second component 20 in the area outside the recess 13. In an embodiment not shown, the axial distance B is greater than the length of the dome shaft 22, whereby an axial gap forms between the front end 25 of the screw boss 21 and the screw receptacle 16. As a result, the second component 20 is pulled axially against the outer side 12 of the first component 10.

[0037] In the embodiments shown, the first component 10 is a sheet metal component 101. The screw receptacle 16 is arranged on a tab 14. The tab 14 is formed by a bent portion 141 of the sheet metal component 101.

[0038] The screw receptacle 16 is provided with at least one recess 17 for receiving the screw shaft 41. In the Fig. 4, the screw receptacle 16 is provided with three recesses 17. In the embodiment shown in Fig. In the embodiment shown in Figure 5, each of the screw receptacles 16 is provided with a single recess 17. In embodiments not shown, each screw receptacle 16 is provided with two or more than three recesses 17.

[0039] In the embodiments shown, the recess 17 is radially open. In embodiments not shown, the recess 17 is radially closed.

[0040] In the embodiment shown, the first component 10 has a plurality of positioning elements 19, and the second component 20 has a plurality of complementary positioning receptacles 24. The positioning elements 19 each engage positively in one of the positioning receptacles 24. As a result, the two components 10, 20 are aligned with one another in a predetermined position. In embodiments not shown, the second component 20 has a plurality of positioning elements, and the first component 10 has a plurality of complementary positioning receptacles.

Claims

[1] Component arrangement (A) for a medical device (1), in particular a dialysis machine (2), comprising a first component (10) having an inner side (11), an outer side (12) and a recess (13) extending between the inner side (11) and the outer side (12), and having at least one screw receptacle (16) arranged in the recess (13) and set back from the outer side (12) by an axial distance (B) in the direction of the inner side (12), a second component (20) having a screw dome (21) with an elongated dome shaft (22) and a bore (23), wherein the second component (20) is arranged on the outer side (12) of the first component (10) and the dome shaft (22) projects axially into the recess (13), and a screw (40) with a screw shaft (41) having a thread (42) and with a screw head (43), wherein the screw shaft (41) is screwed into the bore (23) and the screw head (43) is axially supported on the screw receptacle (16), whereby the first component (10) is screwed to the second component (20). [2] Component arrangement (A) according to claim 1, wherein the axial distance (B) corresponds at least substantially to an axial length of the dome shaft (22). [3] Component arrangement (A) according to claim 1 or 2, wherein the first component (10) is a sheet metal component (101) and the at least one screw receptacle (16) is arranged on a tab (14), wherein the tab (14) is formed by a folded section (141) of the sheet metal component (101). [4] Component arrangement (A) according to one of the preceding claims, wherein the screw receptacle (16) is provided with at least one recess (17) for receiving the screw shaft (41). [5] Component arrangement (A) according to one of the preceding claims, wherein the first component (10) is provided with at least two screw receptacles (16), wherein the screw receptacles (16) are formed on at least two, in particular opposite, circumferential sides (18) of the recess (13). [6] Component arrangement (A) according to one of the preceding claims, wherein the first component (10) has a plurality of positioning elements (19) and the second component (20) has a plurality of complementary positioning receptacles (24) or vice versa, wherein the positioning elements (19) each engage positively in one of the positioning receptacles (24), whereby the two components (10, 20) are aligned with one another in a predetermined position. [7] Component arrangement (A) according to one of the preceding claims, wherein the second component (20) is made of a plastic material (K), in particular injection-molded. [8] Medical device (1), in particular dialysis machine (2), with a component arrangement (A) according to one of the preceding claims.

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