The invention relates to a Sichtobturator.
From the prior art, for example DE 40 35 146 D2
. US 5,431,151
and US 5,685,820
are known instruments for penetrating body tissue, which have a transparent tip through which the body tissue to be penetrated can be viewed. However, these devices are impractical to handle since the device must be removed after penetration of the tissue to introduce other instruments into the created opening. There is a risk that the created opening closes again or tissue is injured when introducing other instruments.
Out US 5,817,061
a trocar assembly is known in which an outer cannula tube is provided which is open at its distal end. From the proximal end, an obturator shaft can be introduced into this cannula tube, which has a detachably fastened, transparent penetrating tip at its distal end. The obturator shaft is provided at its proximal end with a grip portion which has latching means for connecting to the proximal end of the cannula tube. From the handle, ie from the proximal end, an endoscope with an endoscope optic can be introduced into the obturator shaft. Although this arrangement allows the cannula tube remains in the body opening after the puncture. However, the instrument is still cumbersome to handle, as even after removal of the penetrating tip of the obturator shaft must be reintroduced into the outer cannula tube to perform subsequent investigation or operation steps can.
is therefore an object of the invention, an improved Sichtobturator
to create a simple penetration of tissue and a
Easy handling when inserting required instruments
into the created opening.
The object is achieved by a Sichtobturator with the specified in claim 1
emerge from the dependent claims.
Visual obturator according to the invention
has a tube and an optic or an optical shaft, which
can be inserted into the tube from the proximal end. At the distal
End of the optical shaft is arranged a Penetrierspitze. optical shaft
and tube are coordinated so that the optics of the
proximal end can be inserted into the tube, with or
without attached penetrating tip. That means, for one thing
the Penetrierspitze detachable
connectable to the distal end of the optic shaft and to the other
the length of the
Optics shaft is chosen relative to the tube so that the Penetrierspitze
protrudes distally from the tube when they together with the
Optic shaft is inserted into the tube. This arrangement has the
Advantage that in an operation initially the tube with inserted
Optics shaft and attached penetrating tip are inserted into a body opening
can to expand this. The penetrating tip is preferred
transparent, leaving the tissue under optical control
through the optics, which are in the optic shaft proximal to the penetrating tip
is arranged, can be penetrated. After the widening
of the tissue, the optic shaft with the penetrating tip on the proximal side
be pulled out of the tube, wherein the tube remains in the body opening
and these open
holds. Then you can
the penetrating tip are taken from the optics shaft and the
Optics shaft with the optics again from the proximal end in the
Tubus are inserted so that through the tube under
visual control through the optics now inside the body cavity examinations
or operations performed
auxiliary instruments through the tube or corresponding channels in the optic shaft
and / or rinsing fluids
added and removed
be because the optic shaft and the tube without the Penetrierspitze
are open at the distal end.
the optics shaft and also when introducing auxiliary instruments
into the tube, protects
the tube protects the surrounding tissue from injury. The sentence exists
optic shaft, tube and penetrating tip thus enable improved surgical
or examination procedures.
Furthermore, the Sichtobturator next to a tube and an optical shaft or optics and a fixation tube. In this case, a penetrating tip made of a transparent material is arranged at the distal end of the fixation tube. The Penetrierspitze serves to penetrate the tissue while allowing visual control. The fixation tube and the tube are designed such that the fixation tube can be inserted into the tube from the proximal end together with the penetrating tip attached to the distal end of the fixation tube. At the same time, the optic shaft is designed such that it can be inserted both into the interior of the fixation tube and into the interior of the tube from the proximal end in each case. The thus constructed set consisting of tube, optic shaft and fixation tube allows simplified and verbes sere surgical or examination procedures. The fact that the optic shaft can be used both in the fixation tube and in the tube makes it possible for the optic shaft to be inserted into the tube either together with the fixation tube, ie, in the fixation tube, or without the fixation tube. In an operation, this makes it possible to first insert the optic shaft into the fixation tube and then insert the fixation tube with the optic shaft into the tube. The length of the fixation tube is tuned to the length of the tube so that the penetrating tip emerges from the tube at the distal end and projects beyond the distal end. Arranged in this way, the tube, the optic shaft and the guide tube with penetrating tip can be introduced together into a body opening. In this case, the optics arranged behind the penetrating tip in the optic sheath allows a visual inspection. The Penetrierspitze penetrates the tissue and creates or expands while a body opening. The fixation tube and penetrating tip are smaller in cross section than the inner cross section of the tube so that the fixation tube and penetrating tip can be withdrawn proximally from the tube when the tube has been brought to a desired position. The tube can remain in the body opening and keep it open. When the fixation tube has been removed with the attached penetrating tip of the tube, the optic shaft can again pulled out in the proximimalwärtiger direction from the fixation who the and introduced from the proximal end again into the tube. Thus, the same optics can be used in subsequent examination or surgical procedures, such as diagnostics, dissection and dilatation. In addition, auxiliary instruments can be introduced through appropriate working channels in the optics or through the tube and / or liquids can be added and removed. The fact that the tube remains after insertion into the body opening, injuries of the surrounding tissue can be avoided when reinserting the optics and / or auxiliary instruments. All in all, simplified surgical procedures with a few, standardized instruments, which can be used in different combinations, are thus possible by means of the inventive visual obturator. The arrangement of the optic shaft with the optics inside the fixation tube with the penetrating tip has the further advantage that in this use in the fixation tube, the optics can not come into contact with the tissue to be considered, since it is protected by the Penetrierspitze. This means that the inserted optics remain distally sterile and can be used immediately after completing the procedure with a new sterile tube and a new sterile penetrating tip, saving time and money.
Form of Penetrierspitze oriented u. a. in the direction of view
the optics used to get an optimal picture. Known
Surgical optics usually have
a working channel, which is why the viewing direction inclined to the optical
For example, the angle can be 12 °.
In this case, the optical axis of the optics is so eccentric
arranged the axis of the Penetrierspitze, that the point of the
Penetrating tip is located in the center of the optical image. The distal
The radius of the penetrating tip is ideally between 0.5 and 2
mm in order to prevent reflections to a large extent and still atraumatic
to be. The wall thickness
The penetrating tip is uniform in the field of view, to no adverse effects
and to have distortions of view. Only the tip is appropriate
on the one hand a slim shape and on the other a good cleanability
to allow the Penetrierspitze from the inside. The penetrating tip
is made of a suitable transparent material, preferably plastic,
educated. The material should preferably be Heißdampfsterilisierbar.
proximal end of the optic shaft is detachable with the proximal end
connectable to the tube when the optic shaft is inserted into the tube.
As described, the optic shaft is inserted from the proximal end into
used the tube. When the optics shank completely in
The tube is inserted, it is by suitable fasteners
fixed to the tube. The fasteners are in the range
the proximal end of the tube and the proximal end of the optic shaft
intended. In the connected state form tube and optic shaft one
Unit so that they are introduced together into a body orifice
and the optic shaft held in a predefined position to the tube
More preferably, the fixation tube is detachably connectable at its proximal end to the proximal end of the optic shaft when the optic shaft is inserted into the fixation tube. As described, the optic shaft is inserted from the proximal end into the fixation tube. When the optic shaft is fully inserted into the fixation tube, it is releasably connected to the fixation tube by suitable connection means. The connecting means are provided in each case at the proximal end of the fixation tube and the optic shaft. In this way, the optical shaft and fixation tube form a unit, whereby the optic shaft and the optics disposed in the interior of the optic shaft are held in a predetermined position relative to the penetrating tip attached to the fixation tube. Optics shaft and fixation tube can be used as a unit together in the Tu bus. In this case, the detachable connection between the optical shaft and the tube is designed so that a connection of the optic shaft and tube at the proximal end is possible both with and without fixation tube. For example, the attachment means between the optic shaft and the tube are arranged more proximally than the connection means between the fixation tube and the optic shaft. This allows the optic shaft can be inserted and fixed to the tube with or without surrounding fixation tube. In this way, one and the same optics can be used with or without fixation tube. Thus, with a few instruments different applications can be realized, which reduces the number of instruments and equipment to be provided. Furthermore, fewer instruments need to be cleaned and sterilized after surgery or treatment.
Penetration tip is preferably detachable with the fixation tube
or the distal end of the penetrating tip. This makes possible,
different penetrating tips, for example penetrating tips with
different angles, to one and the same fixation tube or
Optics to set, for example, to adapt to different
Optics to enable.
As a result, the universal applicability of Sichtobturators invention
further improved. Furthermore, a
removable penetrating tip for easier cleaning and sterilization
Penetration tip and fixation tube. Depending on the purpose can
the penetrating tip optionally closed or formed with distal openings
be provided for insufflation. The connection between penetrating tip and
Fixation tube or optic shaft is preferably self-locking,
so that losing the Penetrierspitze during an operation is not possible.
The penetrating tip may preferably pass through the tube to the fixation tube
or secured directly to the optics shaft, if these are in the
Tubus are inserted. The tube can, for example, appropriate
Engagement elements between optics shaft or fixation tube and Penetrierspitze
Secure or block in an engaged position.
are at the distal and / or proximal end of the fixation tube
formed inwardly directed engagement elements, which with corresponding
Recesses on the penetrating tip and / or the proximal end
detachable from the optics shaft
can be brought into engagement. The Penetrierspitze can thus easily
into the distal opening of the
be inserted, wherein the engagement elements form fit in
the recesses on the Penetrierspitze occur and in this way
establish a locking connection between the cone and fixation tube.
Alternatively, another attachment system, for example
a threaded connection, be provided. Also the connection between
Optic shaft and fixation tube at its proximal ends is preferably
designed as latching connection, so that the engagement elements on
the fixation tube when the optic shaft inserted into the fixation tube
will enter into corresponding recesses on the optic shaft and
thus a form-fitting
Establish connection between optic shaft and fixation tube. optical shaft
and fixation tube can
thus simply put together.
Engagement elements are preferably designed such that they, when
the fixation tube is inserted into the tube through the tube
be secured in their engaged position. This prevents
when the fixation tube with the penetrating tip and the optic shaft
is inserted into the tube, the fixation tube of the optic shaft and / or
the penetrating tip can release from the fixation tube, since the engagement means
be secured by the surrounding tube. This can be, for example
be effected in that the engagement elements for releasing radially
are deflectable, with this radial movement through the surrounding
Tube is prevented.
For this purpose, the engagement elements are preferably designed as elastic tongues which have projections directed at their free ends into the interior of the fixation tube, wherein the tongues extend in their rest position in the circumferential plane of the fixation tube parallel to the longitudinal axis thereof and the fixation tube has an outer cross section which substantially an inner cross-section of the tube corresponds. The elastic tongues may be formed by U-shaped slots in the fixation tube. In this case, the tongues extend in rest position parallel and in the same plane as the surrounding parts of the fixation tube. When attaching the penetration tip and / or the optical shaft, the tongues, when the penetrating tip and / or the optical shaft is inserted from the corresponding side into the fixation tube, initially deflected outwards, so that penetrating tip or optic shaft can enter the fixation tube. The optical shaft has for this purpose, at least in the region in which the recesses are formed, which engage with the engagement elements on the fixing tube, an outer cross-section, which substantially corresponds to the inner cross-section of the fixing tube. Correspondingly, in the proximal region, which enters into the fixation tube and in which the recesses for the engagement elements are provided, the penetrating tip has an outer cross section which substantially corresponds to the inner cross section at the distal end of the fixation tube. The tongues are deflected radially outward during insertion, so that they are deflected beyond the outer circumference of the fixation tube. If the penetrating tip or the optic shaft are completely inserted into the fixation tube, the intervention Enter elements in the corresponding recesses on Penetrierspitze or optics shaft and the tongues are thereby guided back to their rest position. Now, if the fixation tube is inserted into the tube, a radial deflection of the tongues is prevented by the surrounding tube and thus achieves a secure connection between Penetrierspitze and fixation tube or between fixation tube and optic shaft.
Recesses on Penetrierspitze and optics shaft, which with the
Engagement elements on the fixing tube engage are
preferably in the form of an annular groove on the outer circumference of the proximal end
the penetrating tip and / or the proximal end of the optic shaft
educated. The formation of the recesses as an annular groove has the
Advantage that the engaging elements in each angular position between
Penetration tip and fixation tube or between fixation tube
and optics can intervene in the recesses. When mating
The individual elements therefore do not have to be at a specific angular position
Respect each other, which simplifies handling.
preferred is on the outer circumference
the proximal end of the penetrating tip and / or the proximal one
End of the optics shaft an annular shoulder as an attachment for the respective
Formed end face of the fixation tube. This allows a
Securing such that the optical shaft does not have the fixed position in the
the engagement elements enter the recesses, out into the
Fixation tube can be inserted. Accordingly, the penetrating tip
not further than into the secured position in the fixation tube
be inserted. About that
In addition, a flush can
Outer surface of the unit
be achieved from fixation tube, optic shaft and Penetrierspitze,
allowing a simple insertion of this composite assembly
into the tube without hooking possible
is. Preferably, at the proximal end of the penetrating tip is a
Paragraph formed, which is inserted into the interior of the fixation tube
can be while the remaining outer cross section
the Penetrierspitze substantially the outer cross section of the fixation tube
equivalent. Accordingly, the proximal end of the optic shaft
an outer cross section
on, which we sentlichen the outer cross section of the fixation tube
corresponds, so that here too a flush and smooth outer contour
without steps in transition
is reached. The optic shaft has a heel or a step
on, where the optic shaft tapers in the distal direction, so
that he rejuvenated with this
Area can be inserted into the fixation tube.
is the optic shaft with the tube at its proximal end by means of
a closure element detachable
connectable. This closure element provides a force and / or
Connection between tube and optic stem ago, which easily too
to be able to remove the optic shaft from the tube while the tube remains in a body opening.
Optic shaft is preferably part of an endoscope optic which is known in the art
Way can be formed. This has the advantage that as optics
for the Sichtobturator invention
normal endoscope optics can be used and thus the number of
Surgery or surgery minimizes necessary equipment and instruments
According to one
particularly preferred embodiment
the penetrating tip has a spherical shape. This form allows a
easy insertion into a body opening and
offers good optical properties for viewing the distal
Area through the penetration point.
The distal end of the penetrating tip preferably has an inner radius
greater than 2.5
mm up. Such a radius offers particularly favorable optical properties
and can largely prevent reflections. At the same time a
atraumatic formation of the distal end of the penetrating tip
the invention will be described by way of example with reference to the accompanying drawings
described. In these shows:
1 a partially sectioned overall view of the Sichtobturators invention in the assembled state,
1a an enlarged sectional view of the distal end of a Sichtobturators invention,
2 a cross-sectional view of the optical shaft,
3 a view of the Sichtobturators in the disassembled state,
4 a sectional view of the shaft of the Sichtobturators according to 1 longitudinal,
5 a side view of the penetrating tip,
6 a sectional view of the penetrating tip according to 5 .
7 a schematic view of the top the penetrating tip,
8th a side view of the penetrating tip according to a second embodiment,
9 a sectional view of the penetrating tip according to 8th .
10 a detail view of the distal end of the optical shaft and the penetrating tip according to the second embodiment
11 a sectional view of the Sichobturators in the assembled state according to the second embodiment.
The Sichtobturator invention consists of an endoscope optics 2 with a distally extending optic shaft 4 (please refer 1a . 2 and 3 ). The optic shaft is inside a tube 6 arranged, which at its proximal end by a closure element 8th detachable with the optics 2 connected is. At the distal end of the Sichtobturators is a transparent Penetrierspitze 10 attached in the manner described below. The transparent penetration tip 10 allows optical control during insertion of the Sichtobturators in a body opening or when penetrating tissue.
As in 1a can be seen, runs the optical axis of the optical shaft 4 off-center in the optics 4 and the tube 6 , The viewing angle of the optics is angled in accordance with the inclination of the cone, for example, the viewing direction is set to 12 ° with respect to the longitudinal axis of the shaft, so that the tip of the penetrating tip 10 lies in the center of the optical image and the optical beam path 12 through the tip of the penetrating tip 10 runs.
The inner structure of the optics 2 and the optics 4 correspond to known endoscope optics. Accordingly, the handle portion formed on the proximal side and the connections provided are designed as in known endoscope optics, for which reason a detailed description is omitted here. An inventive advantage of the described Sichtobturators is that known endoscope optics with possibly minor modifications can be used.
2 shows a view of the optic shaft 4 in cross section. In the lower area is a working channel 14 trained, lying over it is off-term with the optical channel 16 arranged. In the optical channel 16 runs the actual optics, wherein the optical axis offset parallel to the longitudinal axis X of the optical shaft 4 or of the tube 6 runs.
The exact structure of the Sichtobturators according to 1 and 2 gets closer by 3 described, which shows the Sichtobturator in the disassembled state. In the illustration according to 3 but is the handle part 18 (please refer 1 ) of the optics 2 from which look the optics 4 extends distally, omitted. The penetrating tip 10 is at the distal end of a fixation tube 20 appropriate. The penetrating tip 10 and the fixation tube 20 have circular cross-sections with substantially the same outer diameter. At the proximal end of the penetration tip 10 an annular shoulder is provided at which the proximal end of the penetrating tip 10 so that it tapers into the interior of the fixation tube 20 can be used, wherein the distal end edge of the fixation tube 20 at the ring shoulder 22 comes to the plant. Proximally spaced from the annular shoulder 22 is an annular groove 24 at the penetrating point 10 educated. At the distal end of the fixation tube 20 are corresponding engagement elements as latching elements 26 formed, which evenly over the circumference of the fixation tube 20 are distributed, in the example shown are four locking elements 26 intended. The locking elements are formed as elastic tongues, which extend directed to the end of the fixation tube. The tongues are formed by U-shaped cuts or grooves whose vertices to the end of the fixation tube 20 directed, ie the free legs of the groove extending from the end of the fixation tube 20 path. In the area of the free, ie movable ends of the locking elements or tongues 26 are radially inwardly directed projections 30 intended. The projections 30 can with the ring groove 24 engage when the proximal end of the penetrating tip 10 into the interior of the fixation tube 20 is inserted from its distal end. The tongues or locking elements 26 are designed elas table, so they when inserting the Penetrierspitze 10 initially deflected radially outward and then when the Penetrierspitze 10 pushed far enough so that the protrusions 30 in the ring groove 24 can enter, are moved back to their original position by an elastic restoring force. The fixation tube 20 and thus the one-piece with the fixation tube 20 trained locking elements 26 are formed of a material having suitable elastic properties, for example metal or plastic, wherein the material must be sterilizable.
In the example shown, the fixation tube 20 symmetrical, ie the proximal and distal end of the fixation tube 20 are identical. This has the advantage that when assembling the instrument does not have to pay attention, as around the fixation tube 20 is used. Accordingly, therefore, also at the proximal end of the fixation tube 20 Eingriffele ments in the form of tongues or latching elements 26 through u-shaped grooves 28 formed in the manner described. The locking elements 26 with their radially inwardly directed projections 30 at the proximal end of the fixation tube 20 are intended to be in a corresponding annular groove 31 at the proximal end of the optic shaft 4 intervene. Also at the proximal end of the optic shaft 4 is an annular shoulder 32 formed from the starting from the optics shaft 4 tapered in the distal direction is formed with a smaller diameter, so that it enters the fixation tube 20 can be inserted. Here comes the proximal end of the fixation tube 20 at the ring shoulder 32 to the plant. The outer diameter of the fixation tube 20 corresponds essentially to the outer diameter of the annular shoulder 32 , so that in the assembled state, a smooth on the outer circumference instrument without steps is created and a hooking when inserted into the tube 6 can be prevented.
The optics shaft 4 enters the fixation tube from the proximal end 20 inserted. Here are the locking elements 26 also initially deflected radially outward until the fixation tube 20 so far on the optics 4 deferred is that the proximal end of the fixation tube 20 at the ring shoulder 32 comes to rest and the projections 30 the locking elements 26 in the ring groove 31 intervention. In this position, the locking elements 26 deflected by elastic restoring forces in their original position, so that the fixing tube 20 on the optics shaft 4 is held positively.
For releasing penetrating tip 10 and optics 4 These are simply distally or proximally from the fixation tube 20 pulled out, with overcoming the elastic restoring forces of the locking elements 26 these are again deflected radially outward and out of the annular grooves 24 and 31 disengage. The penetrating tip 10 can thus easily into the fixation tube 20 be plugged in, and the fixation tube 20 in turn, simply can on the optics shaft 4 be plugged. Since that to the locking elements 26 corresponding recesses as annular grooves 24 and 31 are formed, is not to pay attention to a certain angular position, but can Penetrierspitze 10 , Fixation tube 20 and optics 4 be assembled in any desired angular position to each other.
The optics shaft 4 points as in 1 shown to have a length such that the distal end of the optic shaft 4 inside the penetrating tip 10 is located and an observation of the space in front of the Penetrierspitze 10 through it.
Furthermore, the Sichtobturator has a tube 6 on. The tube 6 also has a circular cross-section with an inner diameter, which is substantially the outer diameter of the fixation tube 20 corresponds, so the fixation tube 20 in the interior of the Tu bus 6 can be used as free of play from its proximal end. The tube 6 has a length that is chosen so that in the inserted state of the fixation tube 20 the penetrating tip with its distal portion of the distal end of the tube 6 emerges or stands out. Because the penetrating tip 10 has an outer diameter which corresponds to the outer diameter of the fixation tube 20 it is possible to use the penetrating tip 10 together with the fixation tube 20 from the proximal end into the tube 6 introduce, with the Penetrierspitze 10 through the tube 6 until it reaches the distal end of the tube 6 exit.
The tube 6 has at its proximal end a closure element 8th for connecting to the proximal end of the optic shaft 4 on. In this closure element 8th can be used for releasable, positive fixation of the tube 6 on the optics shaft 4 a perpendicular to the instrument longitudinal axis acting ball catch element be arranged, which with another, at the proximal end of the optical shaft 4 arranged annular groove can be brought into engagement (not shown here). This second annular groove is proximally spaced from the annular groove 31 arranged.
The Sichtobturator is composed in such a way that first the Penetrierspitze 10 with the fixation tube 20 is connected and the fixation tube 20 on the optics 4 deferred until it reaches the proximal end of the optic shaft 4 locked. Subsequently, the optics with the attached fixation tube 20 and the attached penetrating tip 10 from the proximal end into the tube 6 be inserted until the closure element 8th at the proximal end of the tube 6 with the proximal end of the optic shaft 4 latchingly engages. In this state are all elements, namely penetrating tip 10 , Fixation tube 20 , Optics shaft 4 and tube 6 , firmly connected. The thus assembled Sichtobturator can now under optical control through the optics Kon 2 be introduced into a body orifice. This expands the Penetrierspitze 10 the tissue on.
4 shows a sectional view of the composite Sichtobturators according to 3 , again with the handle part 18 not shown. The diameters of optics shank 4 , Fixation tube 20 and tube 6 are coordinated so that these elements can be arranged as free of play as possible. The right arrangement of fixation tube 20 inside the tube 6 serves to lock the locking elements 26 , so that prevents the Penetrierspitze 10 from the fixation tube 20 and the fixation tube 20 from the optics 4 when this enters the tube 6 are used. As a result, the outer diameter of the fixation tube 20 essentially the inner diameter of the tube 6 it is not possible that the locking elements 26 inside the tube 6 be deflected radially outwards, since the locking elements 26 on the inner wall of the tube 6 come to the plant. Thus, the projections 30 not from ring grooves 24 and 31 disengage when the fixation tube 20 into the tube 6 is used.
The described structure of the Sichtobturators allows a very advantageous handling in the performance of a study or operation. So can the as in 4 shown assembled Sichtobturator are first introduced into a body opening until a desired position or position is reached. Now the closure element 8th be solved and the optics together with the fixation tube 20 and the penetrating tip 10 proximally from the tube 6 be pulled out, the tube 6 remains in the body opening and keeps it open or widened. Subsequently, the fixation tube 20 with the penetrating tip 10 from the optics 4 subtracted from. The optics shaft 4 can then again from the proximal end into the tube 6 be inserted until the closure element 8th again with the annular groove at the proximal end of the optic shaft 4 interlockingly engages. By doing that, the optics shaft 4 always directly with the tube 6 it is possible to use the optics shaft 4 with or without fixation tube 20 and penetrating tip 10 into the tube 6 use. If the optics shaft 4 back into the tube 6 without the penetrating tip 10 is inserted, the instrument is open to the distal end, so through the working channel 14 the optics 2 Auxiliary instruments may be introduced to carry out investigations or interventions. Furthermore, it is possible to supply or remove rinsing fluids and / or body fluids. Because of the tube 6 remains in the body opening, injuries to the tissue during reintroduction of the optics or auxiliary instruments are avoided in the body opening.
Because the optics 2 In essence, like conventional endoscope optics is designed, the optics can 2 can also be used elsewhere, so that a universal applicability of one and the same optics is achieved, whereby the number of required instruments can be reduced. The use of optics inside the fixation tube 20 with the distal tip attached penetrating also has the advantage that the optics through the Penetrierspitze 10 and the fixation tube 20 is protected and thus when used with the Penetrierspitze 10 does not get dirty, allowing for a cleaning / sterilization of the optics 2 can be waived. The optics 2 can then with a new, sterilized fixation tube 20 and penetrating tip 10 be used again.
5 and 6 show detailed views of the penetration tip 10 , The penetrating tip 10 may be formed in two parts, wherein the pointed, distal-side portion is attached to a substantially cylindrical, proximal portion. Only the tapered or pointed portion must be transparent. As in 6 can be seen, points the Penetrierspitze 10 in the example shown a constant wall thickness. Alternatively, the wall thickness may be formed in different areas under different thickness to the optical properties of Penetrierspitzes 10 and the cleanability of the interior of the Penetrierspitze 10 to improve. Thus, the wall thickness may be formed thicker in the region of the tip, so that the smallest inner cross section of the penetrating tip 10 enlarged and the penetrating tip 10 inside is better to clean.
7 schematically shows a possible outer contour of the penetrating tip 10 which advantageously has a parabolic termination. The parabolic shape has the advantage that the tip of the Penetrierspitze 10 can be optimally adapted to the optical conditions.
Based on 8th to 11 a second embodiment of the invention will be described. 8th and 9 show the penetrating tip 10 according to a second embodiment of the invention. In this second embodiment of the invention are at the proximal end of the penetrating tip 10 locking tongues 34 with locking projections 36 arranged, which extend from the tip proximally parallel to the longitudinal axis X. Corresponding to the distal end of the optic shaft 4 according to the second embodiment, an annular groove 38 trained as in 10 shown. The inner cross-section of the proximal end of the penetrating tip has a diameter which corresponds to the outer diameter of the distal end of the optic shaft 4 equivalent. This allows the penetrating tip directly on the distal end of the optic shaft 4 aufzustecken, with the locking projections 36 at the locking tongues 34 with the ring groove 38 at the distal end of the optic shaft 4 engage. According to this second embodiment can thus on the fixation tube 20 be waived. However, the remaining mode of operation of the Sichtobturators invention corresponds to the previous description.
11 shows a sectional view of the Sichtobturators according to the second embodiment, wherein 1a an enlarged detail view of the distal end of the Sichtobturators according to 11 shows. The arrangement of the optical channel 16 as well as the working channel 14 is identical in both described embodiments. When the penetrating tip 10 on the distal end of the optic shaft 4 , as in 10 shown, can be put on the optics shaft 4 from the proximal end into the tube 6 are inserted until the penetrating tip at the distal end of the tube 6 exit. The inner diameter of the tube corresponds to this 6 essentially the outside diameter of the penetrating tip 10 at their largest point in the cross section, so that between the Penetrierspitze 10 and the tube 6 there is no gap in which tissue could penetrate. Furthermore, this coordination of the diameter of the Penetrierspitze 10 and the inner diameter of the tube 6 a fuse of the Penetrierspitze 10 on the optics shaft 4 , Because the penetrating tip 10 has at its proximal cylindrical portion an outer diameter which corresponds to the inner diameter of the tube 6 corresponds, are the locking tongues 34 with their outsides on the inner circumference of the tube 6 when the locking projections 36 with the ring groove 38 are engaged (see 1a ). Thus, the tube prevents 6 in that the locking tongues 34 can be deflected radially outwards and the locking projections 36 from the ring groove 38 can disengage. The penetrating tip 10 Thus, when inserted into the tissue, it can not be accidentally seized by the optic shaft 4 to solve. If the tube 6 with the penetrating tip 10 has been inserted into a body opening, the optic shaft can 4 together with the Penetrierspitze 10 proximally in the direction of the longitudinal axis X from the tube 6 be pulled out. Subsequently, the Penetrierspitze 10 from the distal end of the optic shaft 4 be removed. The locking tongues 34 are no longer through the tube 6 fixed in position and can be deflected radially outwards, so that the locking projections 36 from the ring groove 38 can disengage. When the penetrating tip 10 from the optics 4 The worktop can be separated 4 now without the Penetrierspitze 10 from the proximal end back into the tube 6 be inserted, which has remained in the body opening. As the tube and the optical channel 4 now open at the distal end, it is possible through the tube 6 or the working channel 14 in the optics 4 To introduce auxiliary instruments in order to carry out examinations or interventions inside the body.
- optical shaft
- closure element
- Conical point
- beam path
- working channel
- optical channel
- Handle part
- fixing pipe
- annular shoulder
- ring groove
- locking elements
- U-shaped incisions
- ring groove
- annular shoulder
- locking tongues
- latching projections
- ring groove
- longitudinal axis