Medical hose pump

Abstract

The invention relates to a medical hose pump, in particular for medical dosing, comprising a hose receptacle which is designed such that a hose can be inserted and fixed in the hose receptacle, and comprising a clamping mechanism which comprises a first clamping jaw, the first clamping jaw is preloaded against the second clamping jaw into a clamping position, in which the hose can be clamped, in particular clamped, and wherein the first clamping jaw can be actuated from the clamping position into the open position, in which the first clamping jaw is actuated against the second clamping jaw. The medical hose pump has an open position in which the hose can be released, in particular released and / or inserted, and has a locking lever which can be tensioned, in particular tensioned, indirectly or directly against the first clamping jaw by at least one spring element, in this way, the first clamping jaw is indirectly or directly supported on the locking rod in the open position.

Description

Technical Field

[0001] The present disclosure relates to a medical hose pump. Background Art

[0002] The metering of medical active substances or the conveyance of blood in extracorporeal blood treatment can be carried out by a hose pump. A possible principle of action of such a hose pump is that, by means of a displacement unit of the hose pump, a peristaltic movement is imparted to a hose for guiding a fluid, whereby the fluid is conveyed from an active substance container to an inlet at the patient.

[0003] A hose pump of a radial construction type is disclosed in the applicant's patent EP 3 061 473 B1. The shown hose pump for extracorporeal blood treatment has a motor-driven rotary drive with a rotor, and a squeezing element is arranged radially outside the rotor, and the squeezing element slides or rolls repeatedly in the longitudinal direction of the hose on a hose section that is fixed to the housing and supported in an arcuate manner during rotation.

[0004] A hose pump of a linear construction type is shown in the applicant's patent EP 0 484 717 B1. The hose pump has a hose receptacle for conveying a fluid and a displacement unit having a plurality of slider-shaped displacing elements, which are arranged side by side along the hose receptacle and are guided linearly movable transversely to the receptacle in a well-shaped housing section. The hose is inserted into the hose receptacle and the housing cover is closed, so that the hose is fixed in the hose receptacle by the housing cover. When the housing cover is closed, the displacing elements actuated at time intervals act against the hose, which causes its squeezing on the housing cover and causes the hose to move in a peristaltic mode, which in turn causes the conveyance of the fluid.

[0005] In order to ensure that the fluid flow is directed to the patient only when needed, i.e., only when the hose pump is running and not, for example, already when the hose is inserted into the hose pump, a redundant clamping system is usually used. For this purpose, on the one hand, a hose clamp is provided on the hose itself, and on the other hand, the hose pump has its own clamping mechanism, the clamping of which is activated with the insertion of the hose and the closing of the housing cover.

[0006] In such a structural type, hose pumps are known in the series of the applicant under the names Infusomat®space and Infusomat®spaceplus, the clamping elements of which have fixed and movable clamping jaws. The movable clamping jaw is coupled to a pressure lever that can be touched by the user, by means of which the clamping jaw can be manipulated into the open position, in which the clamping element is open and the hose can be inserted or removed. In this open position, the movable clamping jaw latches and is fixed to the locking lever of the clamping mechanism. The locking lever is in turn indirectly tensioned relative to the movable clamping jaw by a spring element designed as a helical spring, so that the latching of the clamping element and thus the open position are safeguarded.

[0007] The locking lever and the helical spring have small dimensions in the millimeter range, such that their installation is difficult and error-prone. In addition, the locking lever performs a rotational movement, while the helical spring designed as a compression spring is designed for linear movement. Summary of the Invention

[0008] The object of the present disclosure is to provide a medical hose pump that reduces or eliminates the disadvantages of the prior art and is in particular simplified in terms of device technology compared to the prior art.

[0009] This object is achieved by a medical hose pump, in particular for medical metering, in particular for metering active substances or for nutrition or for transporting blood, in particular in an extracorporeal blood circuit. The hose pump can in particular be a component of a dialysis machine or an infusion pump or an injection pump. The hose pump according to the present disclosure has a hose receptacle that is set up and designed to receive and fix a hose, in particular an infusion hose. In addition, the hose pump according to the present disclosure has a clamping mechanism that has a first clamping jaw that is pre-tensioned relative to a second clamping jaw into a clamping position, in which the inserted hose can be clamped, in particular is clamped. From the clamping position, the first clamping jaw can be manipulated into its open position, in which the hose can be released, in particular is released and / or can be inserted. In addition, the clamping mechanism has a locking lever that can be tensioned, in particular is tensioned, indirectly or directly by at least one spring element relative to the first clamping jaw, such that the first clamping jaw is indirectly or directly supported on the locking lever in the open position, in particular such that the first clamping jaw is locked in the open position. According to the present disclosure, the locking lever is integrally formed, in particular materially integrally formed, with the spring element.

[0010] The integrated embodiment has the advantage that it is no longer necessary to coordinate, position and install two small components with each other, but rather the number of components is reduced from two to one. This significantly simplifies the installation and makes it less error-prone.

[0011] Among possible design solutions, the hose receptacle is formed by a hose compartment and a hose compartment cover that closes the hose compartment. The hose can be inserted into the hose compartment when the hose compartment cover is open and can be fixed, in particular, by closing the hose compartment cover.

[0012] According to a preferred refinement, the spring element of the locking lever is configured as a spring tab and is in particular formed onto the base body of the locking lever.

[0013] Since a medical hose pump requires a high degree of availability and reliability and reliable insertion, clamping, and release of the hose are basic prerequisites for operation, the locking lever, which is integrally composed of the base body and the spring tab, is preferably designed for several tens of thousands of operations.

[0014] Basically, a rotational bearing of the base body on the housing side has proven to be advantageous. The spring action is achieved in a simple manner by, according to the refinement, bending the spring tab relative to the base body in the plane of rotation. In this way, both the spring tab and the base body form a V-shape in the plane of rotation.

[0015] According to a preferred refinement, the spring tab is supported on the housing side on the one hand, and on the other hand, the spring tab indirectly (in particular via a pressure lever that can be touched by the user, the movable clamping jaws are coupled to the pressure lever and the movable clamping jaws can be manipulated / touched into the open position by the pressure lever) or directly abuts against the movable clamping jaws to clamp the base body of the locking lever.

[0016] According to the refinement, the spring tab has a particularly robust and simple shape, in which the spring tab is configured to be bent, in particular S-shaped bent, and is in particular connected to the base body.

[0017] The S-shaped configuration / connection ensures force transmission and fatigue strength during the manipulation of the movable clamping jaws into the open position and the clamping position and represents an optimally shaped force flow of the spring tab.

[0018] Regarding the force introduction from the spring tab into the base body, it is particularly advantageous that, according to the refinement, the direction for connecting, in particular forming, the spring tab to the base body intersects the rotational axis of the locking lever.

[0019] Preferably, the spring tab is connected, in particular formed, at approximately or exactly a right angle.

[0020] The above-mentioned V-shape can have an opening angle of less than 90°. The opening angle is dimensioned in particular between the end section of the spring tab and the end section of the base body with respect to the rotational axis of the locking lever, by means of which the end section of the spring tab can support / support the spring tab on the housing side, and by means of which the base body can be tensioned / tense against the movable clamping jaws indirectly or directly.

[0021] In particular, the end section of the spring tab, which is especially connected at a right angle and especially formed, is bent relative to the base body at an opening angle of less than 90°.

[0022] According to an improvement, the end section of the spring tab is supported on the housing side by means of a line contact, which preferably extends along a line normal to the plane of rotation, or by means of a surface contact. The line contact can in this way enable good sliding of the end section of the spring tab on a component on the housing side or on a support surface on the housing side and nevertheless provide good protection against wear.

[0023] According to an improvement, especially in order to achieve the last-mentioned line contact, the support section for supporting the end section of the spring tab on the housing side has an outer cover surface that bulges and bends towards the support surface on the housing side, especially a partially cylindrical outer cover surface.

[0024] Alternatively or additionally, the support section for supporting the end section of the spring tab on the housing side is bent. The bent end section can enable free sliding on the abutment surface or support surface on the housing side. For this purpose, in particular, no additional shape-restricted guidance is required.

[0025] According to an improvement, the width of the spring tab is designed such that tipping of the spring tab out of the plane of rotation is avoided or at least minimized.

[0026] Preferably, the width of the spring tab, especially the width measured in a direction perpendicular to the plane of rotation, is at least 2 to approximately 10 times the thickness of the spring tab measured especially in the plane of rotation.

[0027] According to a preferred improvement, the base body has a preferably columnar support section, which is rotatably supported on the housing side. A connecting section that tapers towards the support section is preferably connected to the support section in the direction of the axis of rotation, and the spring tab is connected to the connecting section.

[0028] In another design, both the support section and the connecting section are cylindrical and especially have the same diameter.

[0029] Preferably, the spring tab is formed / connected to the connecting section by means of a line contact. The term line contact should be understood here such that the cross-section of the forming / connecting part is straight. The spring tab is in this way similarly connected to the connecting section by means of a hinge.

[0030] In order to ensure a movement clearance of the spring tab relative to the support section, according to an improvement, a gap or distance is provided between the spring tab and the support section.

[0031] According to an improvement for being able to influence the spring travel of a base body relative to a spring tab, at least one leg extends away from the base body and / or from the spring tab, and a travel limit or stop for elastic compression and / or elastic extension with respect to the spring tab is formed by this leg, or a force support is formed by this leg.

[0032] In order to increase or be able to better set the spring force according to the travel and / or in order to be able to better control the force loading of a clamping pliers, especially in different movement directions, force directions, and / or elastic compression / elastic extension directions, according to the improvement, a plurality of spring tabs are connected to the base body, and the spring tabs extend especially in different movement directions, force directions, and / or elastic compression / elastic extension directions.

[0033] In particular, at least one spring tab is provided which supports or inhibits the movement of a movable clamping pliers towards the open position, and another spring tab is provided which acts in the direction of the clamping position of the movable clamping pliers. Description of the Drawings

[0034] The present disclosure will be explained in more detail below with the aid of two exemplary, non - restrictive embodiments shown in the drawings. Shown here are:

[0035] Figure 1 A medical hose pump according to an embodiment is shown in a front view,

[0036] Figure 2 Shown according to Figure 1 A hose pump with an open front cover,

[0037] Figure 3 The clamping mechanism of a medical hose pump according to Figure 1 and Figure 2 is shown in a perspective view,

[0038] Figure 4 A locking lever according to a first embodiment is shown in a perspective view, and this locking lever is installed in the clamping mechanism according to Figure 3 ;

[0039] Figure 5 The locking lever according to Figure 4 is shown in a bottom view;

[0040] Figure 6 The locking lever according to Figure 4 and Figure 5 is shown in a side view, and

[0041] Figure 7 A locking lever according to a second embodiment is shown, and this locking lever can be installed in the clamping mechanism according to Figure 3 ;

[0042] Wherein: 1 - hose pump; 2 - housing; 4 - front side; 6 - operation area; 8 - display; 10 - hose compartment cover; 12 - hose compartment; 14 - infusion hose; 16 - blank portion; 18 - hose clamp; 20 - clamping mechanism; 22 - first clamping jaw (clamping position); 22' - first clamping jaw (open position); 23 - second clamping jaw; 24 - axis of rotation; 26 - pressure rod; 28, 128 - locking rod; 30 - locking projection; 32 - locking section; 34 - base body; 36, 136 - spring tab; 38 - axis of rotation; 40 - end section; 42 - outer cover surface; 44 - support section; 46 - connecting section; 48 - gap; 50 - leg. Detailed implementation manner

[0043] Figure 1 The medical hose pump 1 designed as an infusion device is shown in a three-dimensional view from the front. The infusion device or hose pump 1 has a substantially cuboid housing 2, which has a front side 4 formed by a hinged and foldable hose compartment cover 10 on the lower side, on which an operation area 6 and a display 8 are arranged. The hose compartment 12 is closed by the hose compartment cover 10, and the infusion hose 14 is placed into the hose compartment (see also Figure 2 ).

[0044] Figure 2 The infusion device 1 according to Figure 1 is shown in a three-dimensional view observed from the front, and the infusion device has an open hose compartment 12, that is, a flipped-up hose compartment cover 10. Here, according to Figure 2 , the infusion hose 14 extends from the right side from an infusion container (not shown) into the hose compartment 12. The infusion hose 14 is placed as required.

[0045] The hose compartment 12 and the hose compartment cover 10 together form a hose receptacle according to the present disclosure, and the hose receptacle is designed such that the infusion hose 14 can be placed into the hose receptacle and can be determined by closing the hose compartment cover 10 in the illustrated embodiment.

[0046] The hose compartment 12 has a hose inlet 20 in the region of the right side wall when viewed from the operation perspective and a hose outlet in the region of the left side wall. In accordance with Figure 2 , the closed hose compartment cover 10 and the bottom or base of the hose compartment 12 together form a molding section, and the infusion hose 14 is placed into the molding section in its operating position. By closing the hose compartment cover 10, the infusion hose 14 is fixed in this operating position.

[0047] Regarding the conveying direction from right to left, according to Figure 2, a substantially rectangular void portion 16 is provided at the bottom right of the hose cell 12, which void portion is spanned by a membrane, behind which linear ejectors are arranged, which ejectors squeeze the infusion hose 14 towards the closed hose cell lid 10 in a peristaltic sequence during operation and thereby convey fluid from right to left to the patient.

[0048] To ensure that fluid flow to the patient only occurs by means of the hose pump 1 and not prematurely (e.g., when inserting the infusion hose 14 into the hose cell 12), a redundant clamping system is provided. On the one hand, a hose clip 18 is already firmly provided on the infusion hose 14 itself, and on the other hand, the hose pump 1 has a clamping mechanism in the housing 2, which clamping mechanism is arranged as far as possible within the housing 2 and thus is Figure 2 not shown in the Figure 2 . However, for better orientation, the position of the clamping mechanism is indicated by reference numeral 20 in the

[0049] Figure 3 . It can be seen therefrom that the clamping mechanism is arranged in close proximity to the hose clip 18 used. Here, the clamping mechanism 20 is activated by inserting the hose clip 18 into the clamping mechanism 20 and then closing the hose cell lid 10 when inserting the infusion hose 14. Figure 2 The exposed clamping mechanism 20 is shown in a side view, which side view is approximately corresponding to the viewing direction from right to left according to Figure 3 . The clamping mechanism 20 has two clamping jaws 22 and 23, wherein only the clamping section is schematically shown in the

[0050] and is shown in the clamping position. In the shown clamping position (22, 23), the clamping section has a small predetermined distance, which is approximately corresponding to twice the wall diameter of the infusion hose 14, so that the infusion hose is completely clamped in the clamping position but not damaged. The second clamping jaw 23 is fixed. Figure 2 The first clamping jaw 22 can rotate, i.e., move, about a rotation axis 24. The first clamping jaw 22 is coupled to a pressure lever 26 that can be touched by the user (see also Figure 3 ), and the first clamping jaw can be manipulated to the open position indicated by reference numeral 22' in the Figure 2 by means of this pressure lever, in which open position the first clamping jaw 22' is open and the second jaw 23 provides a mouth-shaped opening into which the infusion hose 14 can be inserted. (See

[0051] here is the inserted infusion hose 14, clamping position). Figure 3In the open position, the movable clamping jaw 22' that is manipulated into the open position is latched, according to the present disclosure and in the illustrated embodiment, indirectly via a pressure lever 26 with a locking lever 28 of the clamping mechanism 20, and is fixed in its open position in this way. This latching is achieved by arranging a latching projection 30 of the pressure lever 26 on a latching section 32 of the locking lever 28.

[0052] According to the present disclosure, the locking lever 28 is formed by a base body 34 with a latching section 32 and a spring tab 36. According to the present disclosure, the latter is integrally constructed with the base body 34. For this purpose, the spring tab 36 is formed onto the base body 34. The spring tab 36 extends in an S-shaped bend from the base body 34. The locking lever 28 is supported in a rotatable manner about a rotation axis 38 and has a substantially V-shaped basic shape in the rotation plane.

[0053] The end section of the spring tab 36 that is remote from the base body 34 is supported on the housing side and has a pre-tension. In this way, the base body 34 is tensioned relative to the pressure lever 26, and the first clamping jaw 22' is indirectly fixed in its open position by this pressure lever.

[0054] As the infusion hose 14 is inserted into the hose pump 1, the hose clip 18 is pushed into its assigned well-shaped part in the clamping mechanism 20 (see Figure 2 ), and the locking lever 28 is manipulated inside the housing 2 here, in that the hose clip indirectly (by means of an intermediate lever not shown) and in particular against the spring force of the spring tab 36 moves the base body 34 of the locking lever out of the Figure 3 shown open position / latching position about the rotation axis 38 in the clockwise direction. As a result, the pressure lever 26 latches in the clockwise direction about the rotation axis 24 due to its pre-tension and also brings the first movable clamping jaw 22' into its clamping position (denoted by the reference numeral 22) in the clockwise direction, and the clamping mechanism 20 clamps the infusion hose 14 downstream of the hose clip 18 (see the position of the pressure section 26 in Figure 2 ).

[0055] By closing the hose grid cover 10, this hose grid cover (subsequent to the previously described closing of the clamping mechanism 20) pushes the hose clip 18 designed as a sliding clip into its open position.

[0056] In this way, the clamping function of the hose clip 18 is automatically transferred (by inserting the infusion hose 14 and closing the hose grid cover 10) to the clamping function of the clamping mechanism. Fluid flow is only achieved when the user inputs a corresponding command via the operating area 6.

[0057] Figure 4 In accordance with Figure 3The perspective view shows the locking lever 28 in an exposed illustration. It can be clearly seen here that the end section 40 for supporting the spring tab 36 on the housing side (see Figure 3 ) has a partially cylindrical outer cover surface 42 that is convexly curved towards the support surface on the housing side. The end section can slide well by means of this outer cover surface. To ensure the movement clearance of the spring tab 36 relative to the support section 44, according to Figure 4 a gap 48 is provided between the spring tab 36 and the support section 44.

[0058] Figure 5 The exposed locking lever 28 according to Figure 4 is shown in a view from below and in combination with Figure 4 and 6 it is shown that the width of the spring tab 36 is dimensioned in the direction perpendicular to the plane of rotation, which is the direction of the axis of rotation 38 (also called y) in the drawing, and is approximately 5 to 10 times the thickness of the spring tab 36, where the thickness is dimensioned in the plane of rotation, that is, in the x-z plane according to Figure 4 or Figure 6 . Preferably, the width is at least 2 times the thickness of the spring tab 36. In this way, the spring tab 36 has high torsional stiffness, thus preventing lateral kinking and / or offset especially when the spring tab 36 is elastically compressed.

[0059] Figure 6 The exposed locking lever 28 according to Figure 4 or Figure 5 is shown in a side view, where especially the S-shaped curved shape of the spring tab 36 is shown.

[0060] Figure 7 The locking lever 128 according to the second embodiment is shown in a side view. This locking lever can also be installed in the clamping mechanism 20 according to Figure 3 . Different from the embodiment according to Figures 3 to 6 , here a plurality of legs 50 extend from the spring tab 36, thereby forming a travel limit or stop for the elastic compression of the spring tab 36 towards the base 34 and for the elastic extension of the spring tab 36 and forming an additional force support for the spring tab 36 in its terminal position.

Claims

1. A medical hose pump (1), in particular for medical metering, having a hose receptacle which is designed such that a hose (14) can be inserted and fixed into the hose receptacle, and the medical hose pump having a clamping mechanism (20) including first clamping jaws (22, 22'), the first clamping jaws being prestressed against second clamping jaws (23) into a clamping position in which the hose (14) can be clamped, in particular clamped, wherein, The first clamping pliers (22, 22') can be manipulated from the clamping position into the open position, in which the hose (14) can be released, in particular released and / or inserted, and the medical hose pump has a locking lever (28) which can be tensioned, in particular tensioned, against the first clamping pliers (22, 22') indirectly or directly by means of at least one spring element (36), such that the first clamping pliers (22, 22') are indirectly or directly supported on the locking lever (28) in the open position, characterized in that the locking lever (28) is integrally formed, in particular materially integrally formed, with the spring element (36).

2. The hose pump (1) according to claim 1, characterized in that, The spring element is configured as a spring tab (36) which is formed onto a base body (34) of the locking lever (28).

3. The hose pump (1) according to claim 2, characterized in that, The base body (34) is rotatably supported on the housing side (2), wherein the spring tab (36) is bent against the base body (34) in the plane of rotation, wherein the spring tab (36) is supported on the housing side and the base body (34) is tensioned indirectly or directly against the first clamping pliers (22, 22') by means of the spring tab (36).

4. The hose pump (1) according to claim 2 or 3, characterized in that, The spring tab (36) is configured to be bent, in particular S-shaped bent.

5. The hose pump (1) according to any one of the preceding claims 2 to 4, characterized in that, The spring tab (36) is shaped, in particular connected to the base body (34), in a direction which intersects the axis of rotation (38) of the locking lever (28).

6. The hose pump (1) according to any one of the preceding claims 2 to 5, characterized in that The end section (40) for supporting the spring tab (36) on the housing side has an outer cover surface (42) which is convexly bent, in particular partially cylindrical, towards the support surface on the housing side.

7. The hose pump (1) according to any one of claims 2 to 6, characterized in that, The width of the spring tab (36) is measured, in particular, in a direction perpendicular to the plane of rotation, in particular in the direction of the axis of rotation (38), and is in particular at least 2 to 10 times the thickness of the spring tab (36) measured in the plane of rotation.

8. The hose pump (1) according to any one of claims 2 to 7, characterized in that, The base body (34) has a support section (44) and a connecting section (46) which tapers towards the support section (44), the support section being rotatably supported on the housing side, the spring tab (36) being connected to the connecting section, wherein a gap (48) or a distance is provided between the spring tab (36) and the support section (44).

9. The hose pump (1) according to any one of claims 2 to 8, characterized in that, At least one leg (50) extends from the base body (34) and / or from the spring tab (36), the leg forming a travel limit or a stop for elastic compression and / or elastic extension of the spring tab (36), and / or the leg forming a force support.

10. The hose pump according to any one of claims 2 to 9, characterized in that, A plurality of spring tabs are connected to the base body, in particular one spring tab assisting or inhibiting the movement of the first clamping pliers into the open position and another spring tab acting in the direction of the clamping position.

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