DE8812121U1 - Clamp - Google Patents

Description

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STREET & FABRIC RAIN

Patent Attorney* Eurov>«an Patent Mlotneye Süddeutscht/ Feinmechanik GmbH Bridge Street

5480 Waechtersbach

Description

Clamp

The innovation relates to a clamp made of an elastic strip-shaped material for clamping elastic hoses carrying fluids, in particular blood-conducting hoses in the form of preferably an oval geometry, wherein the clamp is penetrated by the hose and has projections facing each other that act on the hose to clamp it, and wherein a free end of a first clamp section interacts optionally with a first locking projection protruding from a second clamp section to open or close the hose.

Corresponding hose clamps made of elastic plastic are used for blood hoses, e.g. in extracorporeal blood purification. The hose preferably penetrates the clamp material in opposite areas. Protrusions protrude from the inner wall of the clamp perpendicular to the hose's longitudinal axis, which act on the hose in such a way that when the clamp is closed, the hose is clamped off and when the clamp is open, the flow through the hose is released. The clamp is closed by a free end of a first clamp section interacting with a locking projection such as locking cams on a second clamp section, so that a roughly closed oval is formed at this point.

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< STREET & FABRIC FREE

Patent Attorneys - European Patent AHc*n4ye

When the clamp is opened , the free end of the first clamp section is spaced from the locking cam . Depending on the geometry and elasticity of the elastic material of the clamp, it is more or less open, so that the clamp itself sits loosely on the hose and can slip due to its own weight. This is particularly disadvantageous if it is necessary to close the hose quickly, e.g. in an emergency. This slipping could be avoided by making the clamp more rigid so that the first clamp section only bends away to such an extent when the clamp is open that the hose continues to be held clamped between the projections. However, this can lead to uncontrolled pre-tensions in the direction of the hose when the clamp is open, which do not allow a defined flow through the hose itself.

The aim of this innovation is to design a clamp, particularly for medical tubes of the type mentioned above, in such a way that a controlled open state is achieved, while ensuring that the clamp always remains in a desired position, i.e. is easily accessible for quick access. Furthermore, the possibility of simple one-handed operation should be provided.

The task is essentially solved according to the innovation in that the second clamp section is extended beyond the first locking projection, i.e. has an extension and preferably has an abutment for the free end of the first clamp section in the area of its free end. The extension of the second clamp section provides a guide for the first clamp section which can be pivoted from the plane spanned by the clamp , so that uncontrolled movement is avoided and grasping the clamp and thus clamping the hose is made easier. The abutment also fixes the first clamp section in a controlled manner when the clamp is open. Consequently, the clamp is also open in the opening direction .

28324/23.9.88/bn

STREET & FABRIC RAIN

Patent Attorneys · European Patent Attorneys

tensioned, whereby the clamp exerts an optimal pre-tension on the hose. This ensures a secure and defined clamp fit without the risk of the clamp slipping uncontrollably on the hose. This means that the user of the new clamp can attach it to any desired place on the hose, so that it is always ready to hand.

The extension, which is preferably designed as a pointed part on the second clamp section and which, when the clamp is closed, protrudes beyond the outer surface of the first clamp section, which has a structure for safe handling, also has the advantage that safe one-handed unlocking is possible by bending the extension away from the first clamp section and thus allowing its free end to engage with the locking projection. The clamp can then spring open in a controlled manner until the free end of the first clamp section rests against the abutment.

The abutment itself can optionally run at a distance from the free end of the extension of the second clamp section, so that this results in an approximately T-shaped geometry of the second clamp section and thus an L-shaped end section geometry, which makes it easier to unlock the clamp. Preferably, however, the abutment is designed as an end section angled in the direction of the first clamp section.

Further details, advantages and features of the innovation arise not only from the protection claims, the features derived from them - individually and/or in combination - but also from the following description of a preferred embodiment shown in the drawing.

The single figure shows a side view of a KIeMe (10) through which an elastic tube (iz) such as a blood supply tube for extracorporeal blood purification

28324/23.9.88/bn

* FABRIC RAIN

Patent Attorneys · European Patent Attorneys

or riüsEigkei-Sdosieruiig should be either disconnected or opened.

The clamp consists of a base section (14) from which a projection (16) extends in the direction of the hose (12). First and second sections (18) and (20) extend from the base section (14), through which the hose (12) passes in opposite areas (22) and (24). The section (18) is in >.__.._ _..c J&mdash;&ldquor; 11..1..U^r ₁ II.! / 1 &Lgr; \ «tt»»·!» i)un>u<nl>oU tir>/1 ar_

stretches with its end region (26) in the direction of the second clamp section (20), which runs essentially perpendicular, albeit curved, to the longitudinal axis of the hose (12). From the end region (26) and opposite the projection (16), a further projection (28) extends from the inner wall of the first section (22), which also interacts with the hose (12). The projections (16) and (28) are therefore approximately diametrically opposed to the longitudinal axis of the hose. In order to give the projections (16) and (28) a high level of stability, they are formed by intersecting webs (not specified in more detail) extending from the inner wall of the clamp (10). Furthermore, the first clamp section has a structure (30) in the area of its free end, which is intended to make it easier to grip the clamp when opening or closing it.

The second clamp section (20), which extends to the dashed line (33), has a locking projection or locking cam (32) in its end area, which grips the front free end (34) of the first clamp section (18) when the clamp (10) is to close off the hose (12). Going beyond the locking projection (32), the second clamp section (20) has an extension (36), e.g. designed as an injection-molded tab, the end (38) of which is angled in the direction of the first clamp section, i.e. in the direction of the free end (j4) and acts as an abutment (38) for this. The length of the abutment (38) or the radius of curvature of the extension (36) is selected so that the free end (34) rests against the inner surface of the abutment (38) when the clamp (10) is open. This means that the gill (10) experiences a

28324/23.9.88/bn

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&igr; STREET & FABRIC RAIN

Palentan»·** · European PMmH Attorneys

Pre-tensioning, whereby the projections (16) and (28) continue to grip the hose (12) in a clamping manner, but without the flow being influenced in an uncontrolled manner. This results in a self-locking which ensures that the gill can be fixed in any desired position of the hose (12).

Additional locking projections such as locking lugs (40) and (42) can be provided between the abutment (38) designed as the unrolled end of the extension (36) and the locking projection (32) in order to be able to adjust the flow through the hose (12) in a controlled manner by means of the clamp (10).

The hose clamp (10) is preferably made of elastic plastic and is manufactured as an injection-molded part. The shape of the clamp (10) can be described as oval. Other geometries are of course also possible.

28324/23.9.88/bn

Claims (1)

» STREET & FABRIC RAIN Ao South German· Precision Mechanics GabH Bridge traffic Waechtersbach ( ) Protection claims Clamp 1. Clamp made of an elastic strip-shaped material for clamping elastic hoses carrying fluids, in particular blood-carrying hoses, in the form of preferably an oval-shaped geometry, wherein the clamp is penetrated by the hose and has projections facing each other acting on the hose for clamping it, and wherein a free end of a first clamp - ■ sections for opening or closing the hose optionally interact with a first locking projection protruding from a second clamp section,
characterized, that the second terminal section (20) is provided with an extension (36) beyond the first locking projection (32). 2. Clamp according to claim 1, characterized/
that the extension (36) in the area of its free end «in abutment (38) for the free end (34) of the first KIf
sections (18). 28324/23.9.88/bn ■&bull;ta ·· ·· *■ " ROAD & STDRAIN ■ EurapMn PatwX Attomaya 3. Gill according to at least claim 1,
characterized in that when the free end (34) of the first gill section (18) rests on the first locking projection (30), the hose is clamped off and when it rests on the abutment (38), the hose is essentially opened with the gill (10) being held on the hose in a self-locking manner. 4. Clamp according to claim 2, characterized in that the abutment is spaced from the free end of the extended second clamp section (20, 36). 5. Clamp according to claim 2, characterized in that the abutment (38) is an end section of the extended second clamp section (20, 36) which is angled in the direction of the first clamp section (18). Clamp according to claim 2, characterized, that the abutment is one of the extended second ■en section (20, 36) is a protruding projection. Clero- Valve according to at least claim 1,
characterized in that the extended second clamp portion (20, 36) has further locking projections (40, 42) between the first locking projection (30) and the abutment (38). 8. KIeMe according to at least claim 1, characterized in that the extension (36) has a second terminal Achnitt (20) is a sharpened tab. 28324/23.9.88/bn