WO2016023629A1

WO2016023629A1 - Tubular-shaft instrument with a tubular shaft and a flush connection

Info

Publication number: WO2016023629A1
Application number: PCT/EP2015/001641
Authority: WO
Inventors: Ralph Bacher
Original assignee: Bacher Medizintechnik GmbH
Priority date: 2014-08-14
Filing date: 2015-08-08
Publication date: 2016-02-18
Also published as: DE202014006636U1

Abstract

The invention relates to a tubular-shaft instrument (1) having a tubular shaft (3) on the first proximal end (5) of which is arranged a handle part (2) with a fixed handle lever (8) and a pivot lever (13) which can be pivoted relative to the fixed handle lever, and on the second distal end (25) of which is provided a tool (4) with a bearing element (24), which can be adjusted by actuating the handle part (2) by means of a traction element (27) arranged longitudinally displaceable in the tubular shaft (3), wherein the tubular-shaft instrument (1) has a flush connection (40) for rinsing the tubular shaft (3). To improve the cleansing, the present invention provides that the tubular shaft (3) is coated outside and/or inside with a plastic coating (36, 37).

Description

Designation: tubular shaft instrument with a tubular shaft and a

Flushing connection

description

The invention relates to tubular shaft instrument with a tubular shaft at the first, proximal end of a handle with a festste- lever handle and a pivotable relative to this pivoting lever is arranged and at its second, distal end provided with a bearing element tool is provided which by pressing the Gripping part is adjustable by a longitudinally displaceably arranged in the tubular shaft pulling element, wherein the tubular shaft instrument has a flushing connection for flushing the tubular shaft,

Pipe shank instruments with a tubular shaft have been known for a long time. This tubular shaft is provided in a first end region with a handle part, which has a fixed handle lever on which a pivot lever is pivotally mounted.

By actuating this pivoting lever, a tool arranged on the second end of the tubular shaft is actuated, for which purpose a tension element arranged longitudinally displaceably in the tubular shaft, in particular in the form of a puller wire, is provided. Dement speaking has the

Pivoting lever on a pull lever with which the tension element, at least pivotally, is in train connection. The tubular shaft is arranged regularly on a housing-like guide housing of the stationary handle lever and connected to this usually via a union nut, a bayonet connection or a kind of locking connection. Furthermore, such tubular shaft instruments can also be provided with a so-called flushing connection, which is arranged either in the region of the guide housing or in the region of the tubular shaft itself. Such flushing connections serve for flushing the pipe with a special cleaning liquid after use. This ensures that the tubular shaft instrument can be reused in a hygienically acceptable manner.

With regard to possible embodiments of such tubular shaft instruments, in particular with a tubular, rigid tubular shaft, reference is made by way of example to DE 10 2010 048 223 A1, DE 10 2011 008 013 A1 or the text 20 2011 000 828 U1 in full content. In tubular shaft instruments with a rigid tubular shaft, however, it would be particularly advantageous for extremely small diameter of the shank when "contaminate" as little contamination as possible during use in the tubular shaft, so that the cleaning can be accomplished optimally when flushing ^¬ through. This particular because the traction element located in the tubular shaft in the form of a puller wire to the inner wall of the tubular shaft has only a minimum radial distance, whereby the rinsing is difficult.

In Rohrschaftinstrumenten with a flexible tubular shaft of the tubular shaft of a so-called spiral casing, which in turn is made of a tightly wound spiral of a square or round wire. On the one hand, such a design of a tubular shaft has the advantage of flexible bendability and, on the other hand, such a tubular shaft is equipped with a high pressure resistance.

Such tubular shaft instruments with flexible and / or small diameter are used in particular in neurology and in mini-invasive surgery, gynecology, gastrology and, for example, in the form of so-called PE forceps for sample excision. As tools with moving tool parts come here pincers or scissors-like instruments in question, which may be provided with one or two movable jaws or Werkzeugtei ^¬ len.

To operate these tool parts a puller wire is provided in the tubular shaft, which with a handle-side pull lever of

Swivel lever is in operative connection. If the pivot lever pivoted from a "neutral" starting position into an end position, this pivoting movement is transmitted on the basis of the existing Wirkver ^¬ bond to the traction element to this, in turn, an axial displacement of the pull wire is effected in the tubular shaft. The pull wire is in turn in operative connection with the movable tool parts, which in turn are in the "neutral" position of the pivot lever, for example, in an "open" starting position. Now, if the pull wire is moved axially, so this causes, for example, a pivoting movement of the tool parts, so that they can act as a kind of pliers or scissors ^¬ nen.

In particular, due to the "wound" spiral casing, it is difficult to clean this spiral casing, in particular flush with a cleaning liquid in such tubular shaft instruments with flexible tubular shaft. Since the coils of the spiral wrap are not close together, especially when the tube shaft is bent in use, bodily fluids penetrate into the tube shaft. When the tubular shaft is returned to its straight, elongated shape, remnants of body fluid always remain between the coils of the spiral wrap and also between the spiral wrap and the inner puller wire. Since the gaps are extremely close in the stretched state between the windings, these are achieved, for example looking for cleaning difficult effectively with liquid detergents Kings ^¬ nen. Also a

"Rinse" the spiral wrap is not satisfactory. Such flushing is achieved, for example, by means of a Rich provided the Rohschaftes provided flushing connection. Through this flushing connection, cleaning fluid is "injected" into the tubular shaft under partially high pressure. For rigid, tubular Rohschäften with closed pipe wall, this type of cleaning is fraught with problems only at small diameters, since the cleaning liquid can be "pressed" for larger pipe diameters of the tubular shaft through the circumferentially closed tubular shaft, so that the tubular shaft and a possibly. still in the tubular shaft befindlicher pull wire can be washed and cleaned.

However, since in a flexible tubular shaft with spiral sleeve lying on each other winding are not absolutely tight, a complete flushing such flexible pipe shanks over the entire length is not possible because the cleaning fluid can escape between the individual windings and thus the tubular shaft not on the entire length can be flushed through.

This in turn means that after using such a tubular shank instrument the complete tubular shaft must be disposed of together with the tool, as a cleaning of the tubular shaft with the running therein, usually designed as a pull wire or so-called Zugseele tension element, not with the necessary hygiene possible is.

Accordingly, the invention is based on the object to improve a RohrschaftInstrument of the generic type such that the tubular shaft can be cleaned as optimally as possible after use and reusable.

The object is achieved together with the features of the preamble of claim 1, characterized in that the tubular shaft outside and / or inside is coated with a consisting of a transparent, semi-crystalline and perfluorinated polymer plastic coating. Such a polymer is based on a perfluoroalkoxy polymer and is excellently suited for the production of such a coating.

For the preparation of the outer and / or inner coating (s), a combined process of an electrostatic process and a powder coating process can be used. With these methods, in particular coatings with extremely small wall thicknesses can be produced, which is of importance in particular for internal coating in the case of small pipe diameters. In the case of a rigid tubular shaft, an internal coating is generally sufficient. Here, the coating is designed as an antibacterial coating and / or as an extremely "smooth" coating, so that impurities can hardly "deposit". Thus, a cleaning process required after the operation is considerably improved due to the lower contamination.

In the case of a flexible, consisting of a spiral sleeve, the tubular shaft according to claim 2, the tubular shaft is "sealed" by an inner and / or outer side coating, so that an effective full flushing on the entire length of the tubular shaft is feasible. Again, in particular, the inner coating consist of an antibacterial material.

Further advantageous embodiments can be found in the further subclaims. Thus, it can be provided according to claim 3 that the radial thickness of the inner and / or outer plastic coating is between 0.05 mm and 0.25 mm. Due to these extremely low "wall thicknesses" of the coatings, the flexible compliance of the tubular shaft in use is hardly impaired. It can further be provided according to claim 4, that the plastic coatings consist of an antibacterial effect the material or contains such a material, whereby the hygienic properties of the tubular shaft are improved. These antibacterial properties are inherent to the abovementioned material perfluoroalkoxy polymer.

Here, as an active ingredient, for example, nanoscale, antibacterial additives may be embedded in the plastic matrix. Reference to the drawings, an exemplary embodiment of the invention will be explained in more detail by way of example. It shows:

Fig. 1 is a perspective view of an inventive

Tubular shaft instrument with a shortened, flexible tubular shaft and a flushing connection; Fig. 2 is a sectional view of the flexible tubular shaft together with a part of the coupled with this tool.

Fig. 1 shows an example of a possible embodiment of a tubular shaft instrument 1 with a handle part 2, a tubular shaft 3 and a tool part 4. In this embodiment, the tubular shaft 3 is formed as a flexible tubular shaft. With regard to the following description of the coating (s) it should be noted that this is also to be read on a rigid tubular shaft, in particular with a small diameter of a maximum of 1 mm to 2 mm. The invention is therefore not limited to a flexible tubular shaft 3.

As can be seen from FIG. 1, the grip part 2 is arranged fixedly in a first end region 5 of the tubular shaft 3. For coupling the tubular shaft 3 with its first end region 5 on the handle part 2 in the present embodiment, a coupling Shaped sleeve 6 is provided, which is removably attached via an upper nut 7 on the handle part 2.

To mount this coupling sleeve 6 by means of the union nut 7, the handle part 2 forms a first, "fixed" handle lever 8, which has a guide housing 9 in its upper end region. This guide housing 9 is provided with a through hole 10 in which a pull rod 11 is guided in the direction of the double arrow 12 axially adjustable. In operation, this tie rod 11 with a, not visible in Fig. 1, tension member in the form of a pull wire in train, via which in turn the tool part 4 is actuated.

Furthermore, it can be seen from FIG. 1 that a pivoting lever 13 is pivotally mounted on the stationary handle lever 8 via a bearing screw 14. Toward the drawbar 11 towards the pivot lever 13, starting from the bearing screw 14, a pull lever 15 which is provided to the pull rod 11 out with a coupling groove 16. The coupling groove 16 has an approximately C-shaped cross-sectional shape ", and is accordingly" tapered "towards the tension element. With this coupling groove 16, the tension rod 11 is in tension connection via a ball element 17.

By pivoting the pivot lever 13 in the direction of the arrow 18, the pull rod 11 is adjusted in the direction of the arrow 19 and pushed into the guide housing 9 into it. By this adjusting movement of the drawbar 11 of the tubular shaft 3 durchlau- fende pull wire is simultaneously adjusted (not visible in the drawing), so that the two tool parts 20 and 21 in the direction of the two arrows 22 and 23 adjusted to an open pivot position who ^¬ .

In the illustrated embodiment, the work tool 4 is formed with its two tool parts 20, 21 as a kind of pliers. If the pivot lever 13 is moved after carrying out this pivoting movement 1, the pull rod 11 and thus the tension element in tension therewith are correspondingly adjusted back until the two tool parts 20 and 21 are again in the closed pivot position. The maximum pivot angle for the adjustment of the pivot lever 13 with its pull lever 15 in the direction of arrow 18 is selected such that in the illustrated assembled operating state, the ball element 17, in particular in the "open" pivot position of the two tool part 20 and 21 not with the Coupling groove 16 can be disengaged. Thus, the tubular shaft instrument 1 is absolutely reliable.

It can be seen that the tool 4 is formed in the present embodiment as a kind of pliers, which is opened by the adjusting movement described above. The maximum travel on the one hand of the pivot lever 13 in the direction of arrow 18 and on the other hand, the drawbar 11 in the direction of arrow 19 may be limited by an inner stop in the region of the guide housing 9 or in the region of the nut 7 (not visible in the drawing).

It can also be seen from FIG. 1 that the tool 4 for the pivotable mounting of the two tool parts 20 and 21 can have a "fork-shaped" bearing element 24, which in turn is fixedly arranged in the region of the second end 25 of the tubular shaft 3. For fixed mounting of the bearing element 24 at this second end 25 of the tubular shaft 3, a threaded bushing 26 may be provided, which is arranged "frontally" fixed to the second end 25 of the tubular shaft 3. This threaded ^¬ debuchse 26 is preferably welded to the second end 25 of the pipe shaft 3 and can thus be sure of this taken not from ^¬. For fixed mounting of the bearing element 24 on the threaded bush 26, a threaded connection is provided according to the invention. This threaded connection can be realized on the one hand by an internal thread of the threaded bush 26 and a corresponding threaded pin of the bearing element 24 or vice versa, by an internal thread of the bearing element 24 and a corresponding threaded pin of the threaded bush 26.

For this purpose, it should be noted that the bearing element 24 may also be fixedly and non-detachably welded directly to the front, second end 25 of the tubular shaft 3.

Furthermore, a flushing connection 40 is provided in the region between the coupling sleeve 6 and the tubular shaft 3, softer in the

Drawing is shown only schematically as a radial "connection pipe". The arrangement of this flushing connection 40 can also be provided, for example, in the region of the guide housing. Also, further embodiments of the flushing port 40 are conceivable, as is known for example from the aforementioned prior art.

Fig. 2 shows a partial sectional view of the second end 25 of the tubular shaft 3 formed as a spiral sleeve, on which the end face of the threaded bushing 26 is welded. Furthermore, from Fig. 2, the central pull wire 27 can be seen. This passes through the one hand, the tubular shaft 3 and on the other hand, the threaded bushing 25, which has a corresponding Durchgangsbohrüng 28 for this purpose. This through-hole 28 is adapted in diameter d to the diameter D of the pull rod 11 (FIG. 1), so that it can be pushed through this through-hole 28 during disassembly.

Next 2, the bearing element 24 is shown in FIG. Recognizable, which likewise a through hole 29, the diameter may be designed to dress ^¬ ner than the diameter of Durchgangsboh- If a fixed, non-detachable connection between the bearing element 24 and the tubular shaft 3, for example a welded connection is provided, then the diameters can also be dimensioned differently, since the pull wire 27 in such a case usually also during the cleaning remains in the tubular shaft 3.

The flexible shank 3 forms in the "stretched" or straight state shown in Fig. 2, closely spaced windings 35. These windings 35 are coated on the outside with an outer coating 36. In use, this external coating 36 reliably prevents, for example, body fluids from penetrating into the tubular shaft through the wound wall formed by the windings 35. The radial thickness d1 of this coating can be between 0.05 mm and 0.25 mm, depending on the type of production.

Furthermore, it can be seen from FIG. 2 that the windings 35 of the flexible tubular shaft 3 are also provided on the inside with an inner coating 37. Also by this inner coating 37, the windings 35 of the tubular shaft 3 are sealed and thus form a uniform inner surface. Due to this embodiment, the inner region of the tubular shaft 3 can be flushed with a cleaning liquid. Since the spaces between the windings 35 can also be sealed by this inner coating, a flushing of the tubular shaft 3 over its entire length can be carried out safely, so that complete cleaning is ensured safely.

The radial thickness D2 of the inner coating 37 may also be in a range between 0.05 mm to 0.25 mm, which ultimately depends on the inner diameter of the tubular shaft and the radial distance of the puller wire 27 from the inner wall of the tubular shaft 3. It would also be conceivable to provide the tubular shaft 3 only with an outer coating 36 or only with an inner coating 37. This depends on the specific application of the tubular shaft instrument 1 of FIG. 1. If the tubular shaft is designed as a rigid tubular shaft, a "smooth" inner coating would be sufficient for optimum cleaning, by which the adhesion of impurities is made difficult, so that the cleaning when flushing the tubular shaft is more efficient. If it is not to be feared that, for example, bodily fluids or other contaminants penetrate via the tool-side end through the bearing element 24 and the threaded bush 26 into the front end 25 of the tubular shaft 3, it may well be sufficient to provide only one outer coating 36 for later cleaning to be able to optimally perform the tubular shaft 3. This outer coating causes a sufficient seal between the windings 35, so that during the flushing process, even under increased pressure of the cleaning liquid, this can not escape from the tubular shaft 3. With the provision of an inner coating 37 and the sliding properties between the puller wire 27 and the tubular shaft 3 and the inner coating 37 can be improved, which is also in a rigid tubular shaft of advantage.

Also, the outer coating 36 and the inner coating 37 may be made of an antibacterial material.

It is also conceivable that the coatings 36 and / or 37 have an antibacterial effect the active ingredient.

Coatings 36 and 37 can be made, for example, by a combined electrostatic process and a powder coating process. These two methods have the advantage that the coatings 36 and 37 also in a very thin layer may be applied, which may be particularly important for the inner coating 37, if the tubular shaft 3 has an extremely small inner diameter of less than 1 mm. For example, fluoroplastics can be used here as materials, for example under the adcoat brand

31/3800 are known.

This material is based on a perfluoroalkoxy polymer and is characterized by a leaflet of the trademark owner u.a. properties listed below:

Extremely low surface energy and thus has an anti-adhesive effect - Only a few substances adhere to adcoat® 31/3800, sticky materials that stick to it are easy to remove; very good sliding properties - very smooth surface finish compared to other polymer layers;

- Dielectric properties

adcoat® 31/3800 has a high dielectric strength, a low dissipation factor and a high spec. over a wide frequency range. Surface resistance.

Furthermore, this material is highly heat-resistant and can be used in continuous operation at temperatures up to 250 ° C. Thus, this material is also insensitive to high temperatures during sterilization during cleaning and thus optimally applicable for the coating of flexible pipe shafts.

Claims

Tubular shaft instrument (1) with a tubular shaft (3) at its first, proximal end (5) a handle part (2) with a fixed handle lever (8) and a pivotable relative to this pivoting lever (13) is arranged and at its second, distal end (25) provided with a bearing element (24) tool (4) is provided which by pressing the

Handle part (2) by a tubular shaft (3) longitudinally displaceably arranged tension element (27) is adjustable, wherein the tubular shaft instrument (1) has a flushing port (40) for flushing the tubular shaft (3),

characterized,

the tubular shaft (3) is coated on the outside and / or on the inside with a plastic coating (36, 37) consisting of a transparent, semi-crystalline and perfluorinated polymer.

Tubular shaft instrument according to claim 1, characterized in that the tubular shaft (3) consists of a spiral sleeve and is flexible yielding, and

the outer and / or inner side coating is elastically yielding.

Tubular shaft instrument according to claim 1 or 2, characterized in that the radial thickness of the inner (dl) and / or outer (d2) K nststoffbeschichtung (36, 37) is between 0.05 mm and 0.25 mm.

Tubular shaft instrument according to one of claims 1 to 3, characterized ^{¬ in} that the plastic coating (36, 37) consists of an antibacterial material and / or contains an antibacterial active ingredient.