TROCART

TROCAR

Abrégé français

L'invention concerne un trocart permettant une laparoscopie sans gaz. Ce trocart est constitué d'un tube (2) avec un collier (3) à une extrémité. Le tube est en plastique ou en métal et il présente une fente (4) à ouverture constante à travers laquelle un instrument, comme par exemple les lames (10, 11) de ciseaux (9) ou un forceps, peut être introduit, sans expansion du tube.

Abrégé anglais

Trocar (1) intended to be used in gasless laparoscopy and comprising a tube
(2) with a collar (3) at one end. The tube is composed of plastic or metal and
has a constant open slit (4) through which an instrument, for example the
blades (10, 11) of a pair of scissors (9) or hemostatic forceps can be
introduced without expanding the tube.

Revendications

CLAIMS
1. Trocar for use during laparoscopy, comprising a tube with a collar at one end and
an axial longitudinal slit, characterised in that the tube (2) consists of a rigid or
semi-rigid material and that the slit (4) is so wide that a part (11) of said instrument
introduced into the troakar can be brought out through the slit without expanding the
tube.
2. Trocar according to claim 1, characterised in that the width of the slit (4) is less
than the inner diameter of the tube (2).
3. Trocar according to claim 2, characterised in that the width of the slit (4) is
between 25% and 75% of the inner diameter of the tube (2).
4. Trocar according to one of claims 1-3, characterised in that the slit (4) extends
over the whole length of the tube.
5. Trocar according to claim 4, characterised in that the collar (3) has a slit (5)
which forms a continuation of the slit (4) in the tube (2).

Description

CA 02212417 1997-08-06
W 096/24300 PCT/SE96/00134
Troakar
The present invention relates to a trocar, for use during laparoscopy, ColllpliSillg a
tube with a collar at one end and an axial longitudinal slit.
A trocar is known, for example from WO 94/22357 which has a slit tube. The tube
consists of a flexible material and because of the slit can be exr~nC~e~ radially in
order to permit the introduction of an instrument with a larger outer diameter than
the inner diameter of the tube. When the tube does not collt~ill an object which10 strives to exp~n-l the tube the slit is closed so that its end edges are in contact with
each other. The trocar is intcn~ie-l to be used during laparoscopy and permits the use
of instruments with large dirrerellces in size. However, the construction is so that it
is not possible to identify, grip and suture tissues through the slit because there is no
free opening through the slit.
In gasless laparoscopy holes can be made in the abdominal wall, through which lift
rods can be inserted under the abdominal wall and lifted u~w~ldly with a liftingmeans in order to expand the hole in the abdomen through which instruments can
subsequently be fed. A g~ctight introduction port with especially adapted instruments
''O is not needed. During longer operations where dirrclcllt instruments are introduced
through the same hole there is, however, a risk for increasing tr~nm~ti~tion anddamage to the tissues which border the hole.
The object of the present invention is to provide in the first instant a trocar intended
5 for gasless laparoscopy which permits the use and facilitates the introduction of
instruments inten~ie-~ for open abdomen ~urgely which take up a lot of room and
which in this connection protects the tissues around the hole without c-h~n~ing the
circumstances of how the instruments are manipulated.

CA 02212417 1997-08-06
W 096124300 PCT/SE96100134
This is achieved according to the invention by the tube being composed of a rigid or
semi-rigid m~t~ri~l and that the slit being so large that a part of a surgical instru-
ment introduced in the trocar can be taken out through the slit without exr~n~ing the
tube.
S ,
Through the invention a trocar is provided which holds apart the tissues of the hole
and guides the instruments so that these follow the right path through the abdominal
wall at the same time as the dirre~ t tissue layers of the abdominal wall can beidentified through the slit. The slit allows for example the cutting blades of a pair of
10 scissors to be opened and closed through the slit.
The invention is described more closely with reference to the embodiment shown on
the appended drawings, where Fig. 1 shows a perspective view of an embodiment ofa kocar according to the invention, Fig. 2 shows a side view of the trocar placed on
15 a mandrel and Fig. 3 shows a cross-section through an abdomen wall with a kocar
introduced through the wall.
The trocar 1 according to the invention comprises a cylindrical tube 2 of rigid or
semi-rigid material, for example metal or a suitable plastic material, for example
20 PVC. At one end of the tube '' is a collar 3 formed in one piece with the tube. The
tube 2 has an axial slit 4 which exten~1~ over the whole length of the tube and
continues into a slit S in the collar 3. In Fig. 1 the width of the slit 4 is
approximately 25% of the inner diameter of the tube 1. In practice the inner dia-
meter of the tube can be apprnxim~tely 5-15 mm depending on the area of use and
25 the width of the slit can be up to apprnxim~tely 75% of the inner diameter of the
tube. It is most important that the width of the slit is less than the inner diameter so
that the kocar can be held in place on for example a mandrel.
Fig. 2 shows the trocar 1 closed on a mandrel 6 by means of which the abdominal
30 wall 7 is penetrated (see Fig. 3) in order to introduce the trocar into the abdominal

CA 022l24l7 l997-08-06
W 096/24300 PCT/SE96/00134
hole 8. Fig. 3 shows a pair of scissors 9 introduced into the trocar 1. One of the
cutting blades 10 of the pair of scissors is accommodated in the trocar while the
other blade 11 extends out through the slit 4. As can be seen from Fig. 3 the hinge
12 of the blades 10, 11 lies at the level of the abdominal wall 7.
S
The trocar 1 a~cording to the invention is in the first instance intended to be used
during gasless laparoscopy but it can also be used as a holder of a normal trocar for
norm~l laparoscopy and permits quick changes between gas and gasless laparoscopyrespectively the opposite.
The collar 3 at the upper end of the tube 2 prevents the trocar 1 from sliding into the
abdominal hole 8 and can be used in order to fasten the troakar to the skin, forexample with a clamp or through sewing the collar 3 to the skin.

Dessin représentatif