CA2108110A1 - Reducer for cannulae - Google Patents
Reducer for cannulaeInfo
- Publication number
- CA2108110A1 CA2108110A1 CA002108110A CA2108110A CA2108110A1 CA 2108110 A1 CA2108110 A1 CA 2108110A1 CA 002108110 A CA002108110 A CA 002108110A CA 2108110 A CA2108110 A CA 2108110A CA 2108110 A1 CA2108110 A1 CA 2108110A1
- Authority
- CA
- Canada
- Prior art keywords
- reducer
- wall
- cannulae
- openings
- top piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3462—Trocars; Puncturing needles with means for changing the diameter or the orientation of the entrance port of the cannula, e.g. for use with different-sized instruments, reduction ports, adapter seals
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3462—Trocars; Puncturing needles with means for changing the diameter or the orientation of the entrance port of the cannula, e.g. for use with different-sized instruments, reduction ports, adapter seals
- A61B2017/3464—Trocars; Puncturing needles with means for changing the diameter or the orientation of the entrance port of the cannula, e.g. for use with different-sized instruments, reduction ports, adapter seals with means acting on inner surface of valve or seal for expanding or protecting, e.g. inner pivoting fingers
Abstract
Abstract A reducer for cannulae includes a covering cap (30) which can be secured on the external top piece (10) of a cannula (4) and which has a socket (40) engaging with its distal end (42) at the seal (18) of the top piece (10) provided for the shaft of operation instruments. The proximal end face of the socket (40) is sealed off via a wall (46) provided with at least two openings (50, 51). Seals for shafts of operation instruments of smaller diameter are allocated to the openings (50, 51).
(Figure 1)
(Figure 1)
Description
~. 210811 ;~
:
Reducer for cannulae The invention relates to a reducer for cannulae (trocar sleeves) according to the preamble of claim 1.
In endoscopic operation techniques, the operation instruments and observation equipment are introduced into the inside of the body through cannulae. A cannula is inserted through the tissue layers, for example the abdominal wall, with the help of a trocar, which is later removed. In its distal zone a cannula consists of a tube to whose proximal end a top piece is attached, which top piece is located outside the body. In the case of operations in the abdominal area in particular, it is necessary to introduce a gas, for example carbon dioxide, under pres0ure into the inside of the body in order that the abdominal wall is better detached from the internal organs and the organs are thereby easier to access for the operation. To this end, the opening at the distal end face of the top piece through which the shaft of an operation instrument is introduced is provided with a seal in order that the gas does not escape from the inside of the body via this opening. Also located in the top piece there may be a closure device which seals off the opening if no operation instrument i8 inserted. Finally, the top piece can be provided with a connection for the supply of the compressed gas.
The trocar causes merely a punctiform wound which is much smaller than the incisions which are customary in open surgery.
: .
:
Reducer for cannulae The invention relates to a reducer for cannulae (trocar sleeves) according to the preamble of claim 1.
In endoscopic operation techniques, the operation instruments and observation equipment are introduced into the inside of the body through cannulae. A cannula is inserted through the tissue layers, for example the abdominal wall, with the help of a trocar, which is later removed. In its distal zone a cannula consists of a tube to whose proximal end a top piece is attached, which top piece is located outside the body. In the case of operations in the abdominal area in particular, it is necessary to introduce a gas, for example carbon dioxide, under pres0ure into the inside of the body in order that the abdominal wall is better detached from the internal organs and the organs are thereby easier to access for the operation. To this end, the opening at the distal end face of the top piece through which the shaft of an operation instrument is introduced is provided with a seal in order that the gas does not escape from the inside of the body via this opening. Also located in the top piece there may be a closure device which seals off the opening if no operation instrument i8 inserted. Finally, the top piece can be provided with a connection for the supply of the compressed gas.
The trocar causes merely a punctiform wound which is much smaller than the incisions which are customary in open surgery.
: .
2 1 ~ 0 Even the use o~ cannulae with a larger diameter requires a very small incision at most. Such larger cannulae are necessary if certain instruments, such as e.g. suture clip sets, which have proved their worth in open surgery, are also to be used in endoscopic operations. The external diameter of these instruments can scarcely be reduced further even in the case of a special version for endoscopic purposes.
As the aforementioned seal in the top piece of the cannula must lie against the shaft of the operation instrument, it is provided from the outset with a larger free passage opening in the case of larger cannulae, so that an operation instrument with a small diameter cannot thus be introduced into a large cannula in ~uch a way that the seal performs its function.
The object of the invention is to provide a possibility which opens up a more flexible field of application to cannulae with a larger diameter.
This object is achieved by a reducer for cannulae with the features of claim 1. Advantageous versions emerge from the subsidiary claims.
The reducer according to the invention for cannulae includes a covering cap which can be secured on the top piece of a larger cannula. The distal end of a socket engages at the seal of the cannula, so that the reducer is tightly connected to the top piece of the cannula. The proximal end face of the socket is sealed off via a wall provided with at least two openings, seals for shafts of operation instruments of smaller diameter being allocated to the openings. The result is that, depending on the number of openings in the wall, several operation instruments of smaller diameter can be guided simultaneously through the large cannula. It is thus not necessary to introduce a separate cannula through the body wall for each individual operation . .: : .
2 1 ~ 8 t l ~
: .
instrument, a factor of considerable advantage to the patient. ~ ~ ;
With many operation techniques, the fact that the instruments can be brought together to the operation area in a small space can also have favourable conse~uences. -The wall preferably consists of an elastic plastics material, the edges of the openings serving as sealing surfaces. As a result, the structure of the reducer according to the invention is particularly simple and inexpensive. The wall can be reinforced between the openings by a stabilization section, in order that the shape and the sealing behaviour of neighbouring openings are not unfavourably influenced by the insertion of an operation instrument into a given opening.
:
In a preferred version, a closure is allocated to at least one opening. If there are two openings for example, one opening can be sealed off by the closure, so that in this case a large -cannula provided with a reducer according to the invention can -~ -~
be used without problems for a single operation instrument with thin shaft. The closure can be, for example, a stopper whose diameter is matched to the opening in question, or can be -~
designed as a sealing disk, which elastically abuts against the -edge of the opening in question and which can be forced away in distal direction upon the introduction of an operation instrument. ~ `
The invention is described more precisely below with reference to an embodiment. Shown is: ~ ~
,: . ~. .
igure 1 a longitudinal section of a reducer according to the invention, which is fitted onto a cannula, in the plane of the longitudinal axis L-L.
In the representation reproduced in Figure 1, a reducer 2 according to the invention is fitted onto a cannula 4, the ' . :: ' ` ` ' ` ' ' '` ' ' ' ' ---- 2108~10 ~: ~
cannula 4 being a cannula with a larger diameter, for example with a diameter of the order of 40 mm.
The known cannula 4 comprises a top piece 10 to which an essentially cylindrical tube 12 is connected in distal direction. The tube 12 penetrates the body wall with the help of a trocar, which is later removed, while the top piece 10 is located outside the body during an operation. The top piece 10 has a proximal end wall 14 which is provided with a circular opening 16 lying symmetrically relative to the longitudinal axis L-L. Attached to the underside of the proximal end wall 14 is an annular seal 18 whose free diameter is less than that of the opening 16. The seal 18 consists of an elastic plastics material, so that when an operation instrument is introduced through the opening 16 it lies against its shaft. This prevents the compressed gas introduced into the body from escaping outwards through the gap between the shaft of the operation instrument and the edge of the opening 16. In relation to the internal diameter of the tube 12, the diameter of the opening 16 can also be larger than shown in Figure 1 in order to provide better mobility for the operation instrument.
Arranged beneath opening 16 is a flap 20 which can be swivelled away downwards, i.e. in distal direction, about a swivel axis 21, as shown by the arrow. In the position shown in Figure 1 the flap 20 elastically abuts against the distal end of a partition 22 which is shaped here essentially like the surface of a diagonally cut truncated cone. If no operation instrument is inserted, flap 20 is closed, as shown in Figure 1, so that compressed gas cannot escape through the opening 16. Upon introduction of an operation instrument its distal end pushes the flap 20 downwards, and the flap then lies against the shaft of the instrument and no longer impedes its mobility. To improve the sealing effect, the flap 20 or the distal edge of the partition 22 can be provided with a sealing lining.
: .
Provided at the proximal end wall 14 of the top piece 10 are~ ~-recesses 24 which undercut projections 26. The projections 26 serve as counter-supports for stop hooks with which additional apparatus of ~ conventional cannula can be secured, for example -a trocar, with the help of which the puncture point can be -produced for the insertion of the cannula.
The reducer 2 according to the invention includes a covering cap 30 whose cross-section is essentially matched to the cross-section of the top piece 10 - which, unlike that of the tube 12, need not be circular. The covering cap 30 has a proximal end wall 32 with an opening 34. A tubular securing element 36, preferably concentric relative to the longitudinal axis L-L of the reducer 2 and the cannula 4, starts in distal direction from the proximal end wall 32. As its internal diameter is greater than the diameter of the opening 34, an annular projection 38 forms at the proximal end wall 32. -:
A socket 40 with preferably circular cross-section is inserted into the tubular securing element 36. With its distal end 42, the socket 40 engages at the seal 18 of the top piece 10, as shown in Figure 1, so that, when the reducer 2 according to the invention is fitted onto the top piece 10 of the cannula 4, a gas-tight connection results. The socket 40 is in principal suitable for use with different types of cannula. -Clamped between the proximal edge of the socket 40 and the pro~ection 38 is a wall 46 which contains at least two preferably circular openings. In the represented embodiment, two openings 50 and 51 are provided, through which operation instruments with a smaller shaft diameter can be introduced through the socket 40 into the cannula 4 along the axes A-A or B-B. The wall 46 preferably consists of an elastic plastics material, for example silicone rubber, the edges of the openings 50, 51 serving as sealing surfaces which lie against the shaft .` .. ` ` ., ~. ,` ... .....
' "
of the operation instruments. If the elasticity of the plastics material is adequate, it is possible to use operation instruments with quite different shaft diameters and nevertheless achieve the desired sealing effect.
The wall 46 is preferably reinforced by a stabilization section 52 between the openings 50 and 51. The stabilization section 52 can consist of the same material as the wall 46 or of another, for example rigid, material. It can also be designed as a bar which is firmly connected at its two ends to the proximal end wall 32. The stabilization section 52 serves to minimize the influence of an operation instrument, which is introduced for example through the opening 50, on the size and shape of the adjacent opening 51 and on the elasticity ~nd sealing behaviour of the wall 46 in the area surrounding the opening 51. Thus leaks, such as could otherwise occur upon movement of the operation instruments, are avoided. On the other hand, the construction of the wall 46 from an elastic plastics material makes possible a large mobility for the operation instruments, as indicated by the arrows at the distal end of the tube 12.
The proximal end face of the socket 40 is thus sealed off via the wall 46. This mode of expression includes, on the one hand, the embodiment shown in Figure 1 and, on the other hand, variants in which other gas-tight wall sections of the covering cap 30 lie between the proximal end of the socket 40 and the wall 46. Versions are also conceivable in which the sealing effect is achieved, not through the edges of the openings 50, 51 but via separate seals, for example O-rings.
To secure the reducer 2 according to the invention on the top piece 10 of cannula 4, stop hooks 54 are provided at the side wall of covering cap 30 in the embodiment. At their distal ends, the stop hooks 54 each have a pro~ection 56 for engaging beh1nd the project1on~ 26 at the proxLmal end wall 14 of top 2~ O~10 piece 10. The distal zones of the stop hooks 54 can be pressed inwards in radial direction against the elastic force of the stop hooks 54, in order to produce or break the stop connection.
Other means of securing the reducer 2 on the top piece 10 can also be used instead of the stop hooks 54.
,.
In the embodiment shown in Figure 1, a closure in the form of a stopper 60 is allocated to the opening 51, the diameter of the ~topper being matched to the diameter of the opening 51. The stopper 60 is connected to the cover ng cap 30 with the help of a flexible strip 62, so that it is not lost if it is not in use.
In order to seal the opening 51, the stopper 60 can be inserted into the opening 51 with the help of the gripping part 64.
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In an alternative version (not shown in Figure 1), the closure consists of an elastic disk or flap which presses from below against the edge of the opening 50 or 51, a sealing effect being achieved upon selection of a suitable material for the disk or the wall 46. The disk is preferably hinged at one side so that, in a manner similar to the flap 20, it can be pressed away in distal direction upon introduction of an operation instrument.
The disk can be made from the same plastics material as the wall 46. It can be made in one piece with the wall 46 or be connected to the wall 46 afterwards, for example via a securing point.
The reducer 2 according to the invention is applied by fitting it onto a cannula 4 previously introduced in conventional manner lnto the body tissue. The pro~ections 56 of the stop hooks 54 engage at the pro~ections 26 of the top piece 10 of the cannula 4 and ensure a secure mechanical connection. The socket 40 abuts against the seal 18 of the top piece 10 and ensures a gas-tight connection. During this process, the flap 20 is closed so that no gas can escape. Should one of the openings 50 or 51 not be needed, it is closed with the associated stopper 60. An 2~3110 - 8 - ~ .
operation instrument of small shaft diameter can now be introduced through the other opening 50 or 51, thereby opening the flap 20. The sealing effect then results from the fact that the edge of the opening 50 or 51 lies against the shaft of the :~
operation instrument. Several instruments can be used . :
simultaneously where appropriate.
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. . .
"''''',"''`,`,'~ ~' .`` ~
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As the aforementioned seal in the top piece of the cannula must lie against the shaft of the operation instrument, it is provided from the outset with a larger free passage opening in the case of larger cannulae, so that an operation instrument with a small diameter cannot thus be introduced into a large cannula in ~uch a way that the seal performs its function.
The object of the invention is to provide a possibility which opens up a more flexible field of application to cannulae with a larger diameter.
This object is achieved by a reducer for cannulae with the features of claim 1. Advantageous versions emerge from the subsidiary claims.
The reducer according to the invention for cannulae includes a covering cap which can be secured on the top piece of a larger cannula. The distal end of a socket engages at the seal of the cannula, so that the reducer is tightly connected to the top piece of the cannula. The proximal end face of the socket is sealed off via a wall provided with at least two openings, seals for shafts of operation instruments of smaller diameter being allocated to the openings. The result is that, depending on the number of openings in the wall, several operation instruments of smaller diameter can be guided simultaneously through the large cannula. It is thus not necessary to introduce a separate cannula through the body wall for each individual operation . .: : .
2 1 ~ 8 t l ~
: .
instrument, a factor of considerable advantage to the patient. ~ ~ ;
With many operation techniques, the fact that the instruments can be brought together to the operation area in a small space can also have favourable conse~uences. -The wall preferably consists of an elastic plastics material, the edges of the openings serving as sealing surfaces. As a result, the structure of the reducer according to the invention is particularly simple and inexpensive. The wall can be reinforced between the openings by a stabilization section, in order that the shape and the sealing behaviour of neighbouring openings are not unfavourably influenced by the insertion of an operation instrument into a given opening.
:
In a preferred version, a closure is allocated to at least one opening. If there are two openings for example, one opening can be sealed off by the closure, so that in this case a large -cannula provided with a reducer according to the invention can -~ -~
be used without problems for a single operation instrument with thin shaft. The closure can be, for example, a stopper whose diameter is matched to the opening in question, or can be -~
designed as a sealing disk, which elastically abuts against the -edge of the opening in question and which can be forced away in distal direction upon the introduction of an operation instrument. ~ `
The invention is described more precisely below with reference to an embodiment. Shown is: ~ ~
,: . ~. .
igure 1 a longitudinal section of a reducer according to the invention, which is fitted onto a cannula, in the plane of the longitudinal axis L-L.
In the representation reproduced in Figure 1, a reducer 2 according to the invention is fitted onto a cannula 4, the ' . :: ' ` ` ' ` ' ' '` ' ' ' ' ---- 2108~10 ~: ~
cannula 4 being a cannula with a larger diameter, for example with a diameter of the order of 40 mm.
The known cannula 4 comprises a top piece 10 to which an essentially cylindrical tube 12 is connected in distal direction. The tube 12 penetrates the body wall with the help of a trocar, which is later removed, while the top piece 10 is located outside the body during an operation. The top piece 10 has a proximal end wall 14 which is provided with a circular opening 16 lying symmetrically relative to the longitudinal axis L-L. Attached to the underside of the proximal end wall 14 is an annular seal 18 whose free diameter is less than that of the opening 16. The seal 18 consists of an elastic plastics material, so that when an operation instrument is introduced through the opening 16 it lies against its shaft. This prevents the compressed gas introduced into the body from escaping outwards through the gap between the shaft of the operation instrument and the edge of the opening 16. In relation to the internal diameter of the tube 12, the diameter of the opening 16 can also be larger than shown in Figure 1 in order to provide better mobility for the operation instrument.
Arranged beneath opening 16 is a flap 20 which can be swivelled away downwards, i.e. in distal direction, about a swivel axis 21, as shown by the arrow. In the position shown in Figure 1 the flap 20 elastically abuts against the distal end of a partition 22 which is shaped here essentially like the surface of a diagonally cut truncated cone. If no operation instrument is inserted, flap 20 is closed, as shown in Figure 1, so that compressed gas cannot escape through the opening 16. Upon introduction of an operation instrument its distal end pushes the flap 20 downwards, and the flap then lies against the shaft of the instrument and no longer impedes its mobility. To improve the sealing effect, the flap 20 or the distal edge of the partition 22 can be provided with a sealing lining.
: .
Provided at the proximal end wall 14 of the top piece 10 are~ ~-recesses 24 which undercut projections 26. The projections 26 serve as counter-supports for stop hooks with which additional apparatus of ~ conventional cannula can be secured, for example -a trocar, with the help of which the puncture point can be -produced for the insertion of the cannula.
The reducer 2 according to the invention includes a covering cap 30 whose cross-section is essentially matched to the cross-section of the top piece 10 - which, unlike that of the tube 12, need not be circular. The covering cap 30 has a proximal end wall 32 with an opening 34. A tubular securing element 36, preferably concentric relative to the longitudinal axis L-L of the reducer 2 and the cannula 4, starts in distal direction from the proximal end wall 32. As its internal diameter is greater than the diameter of the opening 34, an annular projection 38 forms at the proximal end wall 32. -:
A socket 40 with preferably circular cross-section is inserted into the tubular securing element 36. With its distal end 42, the socket 40 engages at the seal 18 of the top piece 10, as shown in Figure 1, so that, when the reducer 2 according to the invention is fitted onto the top piece 10 of the cannula 4, a gas-tight connection results. The socket 40 is in principal suitable for use with different types of cannula. -Clamped between the proximal edge of the socket 40 and the pro~ection 38 is a wall 46 which contains at least two preferably circular openings. In the represented embodiment, two openings 50 and 51 are provided, through which operation instruments with a smaller shaft diameter can be introduced through the socket 40 into the cannula 4 along the axes A-A or B-B. The wall 46 preferably consists of an elastic plastics material, for example silicone rubber, the edges of the openings 50, 51 serving as sealing surfaces which lie against the shaft .` .. ` ` ., ~. ,` ... .....
' "
of the operation instruments. If the elasticity of the plastics material is adequate, it is possible to use operation instruments with quite different shaft diameters and nevertheless achieve the desired sealing effect.
The wall 46 is preferably reinforced by a stabilization section 52 between the openings 50 and 51. The stabilization section 52 can consist of the same material as the wall 46 or of another, for example rigid, material. It can also be designed as a bar which is firmly connected at its two ends to the proximal end wall 32. The stabilization section 52 serves to minimize the influence of an operation instrument, which is introduced for example through the opening 50, on the size and shape of the adjacent opening 51 and on the elasticity ~nd sealing behaviour of the wall 46 in the area surrounding the opening 51. Thus leaks, such as could otherwise occur upon movement of the operation instruments, are avoided. On the other hand, the construction of the wall 46 from an elastic plastics material makes possible a large mobility for the operation instruments, as indicated by the arrows at the distal end of the tube 12.
The proximal end face of the socket 40 is thus sealed off via the wall 46. This mode of expression includes, on the one hand, the embodiment shown in Figure 1 and, on the other hand, variants in which other gas-tight wall sections of the covering cap 30 lie between the proximal end of the socket 40 and the wall 46. Versions are also conceivable in which the sealing effect is achieved, not through the edges of the openings 50, 51 but via separate seals, for example O-rings.
To secure the reducer 2 according to the invention on the top piece 10 of cannula 4, stop hooks 54 are provided at the side wall of covering cap 30 in the embodiment. At their distal ends, the stop hooks 54 each have a pro~ection 56 for engaging beh1nd the project1on~ 26 at the proxLmal end wall 14 of top 2~ O~10 piece 10. The distal zones of the stop hooks 54 can be pressed inwards in radial direction against the elastic force of the stop hooks 54, in order to produce or break the stop connection.
Other means of securing the reducer 2 on the top piece 10 can also be used instead of the stop hooks 54.
,.
In the embodiment shown in Figure 1, a closure in the form of a stopper 60 is allocated to the opening 51, the diameter of the ~topper being matched to the diameter of the opening 51. The stopper 60 is connected to the cover ng cap 30 with the help of a flexible strip 62, so that it is not lost if it is not in use.
In order to seal the opening 51, the stopper 60 can be inserted into the opening 51 with the help of the gripping part 64.
~. -. . ,~.~
In an alternative version (not shown in Figure 1), the closure consists of an elastic disk or flap which presses from below against the edge of the opening 50 or 51, a sealing effect being achieved upon selection of a suitable material for the disk or the wall 46. The disk is preferably hinged at one side so that, in a manner similar to the flap 20, it can be pressed away in distal direction upon introduction of an operation instrument.
The disk can be made from the same plastics material as the wall 46. It can be made in one piece with the wall 46 or be connected to the wall 46 afterwards, for example via a securing point.
The reducer 2 according to the invention is applied by fitting it onto a cannula 4 previously introduced in conventional manner lnto the body tissue. The pro~ections 56 of the stop hooks 54 engage at the pro~ections 26 of the top piece 10 of the cannula 4 and ensure a secure mechanical connection. The socket 40 abuts against the seal 18 of the top piece 10 and ensures a gas-tight connection. During this process, the flap 20 is closed so that no gas can escape. Should one of the openings 50 or 51 not be needed, it is closed with the associated stopper 60. An 2~3110 - 8 - ~ .
operation instrument of small shaft diameter can now be introduced through the other opening 50 or 51, thereby opening the flap 20. The sealing effect then results from the fact that the edge of the opening 50 or 51 lies against the shaft of the :~
operation instrument. Several instruments can be used . :
simultaneously where appropriate.
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~' " ,' ":
. . .
"''''',"''`,`,'~ ~' .`` ~
~ ' ':
'
Claims (10)
1. Reducer for cannulae, characterized by a covering cap (30) which can be secured on the external top piece (10) of a cannula (4) and which has a socket (40) engaging with its distal end (42) at the seal (18) of the top piece (10) provided for the shaft of operation instruments, the proximal end face of said socket being sealed off via a wall (46) provided with at least two openings (50, 51), seals for shafts of operation instruments of smaller diameter being allocated to the openings (50, 51).
2. Reducer for cannulae according to claim 1, characterized in that, for securing to the top piece (10), the covering cap (30) has elastic stop hooks (54) extending essentially parallel to the socket (40), the free ends of which hooks are provided with projections (56) for engagement at recesses (24, 26) of the top piece (10).
3. Reducer for cannulae according to claim 1 or 2, characterized in that the wall (46) consists of elastic plastics material, the edges of the openings (50, 51) serving as sealing surfaces.
4. Reducer for cannulae according to claim 3, characterized in that the wall (46) consists of silicone rubber.
5. Reducer for cannulae according to one of claims 1 to 4, characterized in that the wall (46) is reinforced by a stabilization section (52) between the openings (50, 51).
6. Reducer for cannulae according to one of claims 1 to 5, characterized in that a closure (60) is allocated to at least one of the openings (50, 51).
7. Reducer for cannulae according to claim 6, characterized in that the closure is a stopper (60) whose diameter is matched to the opening (50, 51) in question.
8. Reducer for cannulae according to claim 7, characterized in that the stopper (60) is secured to the covering cap (30) or wall (46) by means of a flexible strip (62) or the like.
9. Reducer for cannulae according to claim 6, characterized in that the closure is designed as a sealing disk which elastically abuts against the edge of the opening in question (50, 51), which disk can be forced away in distal direction upon introduction of an operation instrument.
10. Reducer for cannulae according to claim 9 and according to claim 3, characterized in that the sealing disk consists of the same plastics material as the wall (46).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4234452.2 | 1992-10-13 | ||
| DE4234452A DE4234452C2 (en) | 1992-10-13 | 1992-10-13 | Reducer for trocar sleeves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2108110A1 true CA2108110A1 (en) | 1994-04-14 |
Family
ID=6470329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002108110A Abandoned CA2108110A1 (en) | 1992-10-13 | 1993-10-08 | Reducer for cannulae |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5385560A (en) |
| CA (1) | CA2108110A1 (en) |
| DE (1) | DE4234452C2 (en) |
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| US5697975A (en) | 1994-02-09 | 1997-12-16 | The University Of Iowa Research Foundation | Human cerebral cortex neural prosthetic for tinnitus |
| US5843093A (en) * | 1994-02-09 | 1998-12-01 | University Of Iowa Research Foundation | Stereotactic electrode assembly |
| US5672168A (en) | 1994-10-07 | 1997-09-30 | De La Torre; Roger A. | Laparoscopic access port for surgical instruments or the hand |
| US5653705A (en) * | 1994-10-07 | 1997-08-05 | General Surgical Innovations, Inc. | Laparoscopic access port for surgical instruments or the hand |
| DE4444924C2 (en) * | 1994-12-16 | 1999-08-12 | Winter & Ibe Olympus | Laparoscopic port |
| US5820606A (en) * | 1996-06-11 | 1998-10-13 | Origin Medsystems, Inc. | Reusable cannula with disposable seal |
| US5820604A (en) * | 1996-06-11 | 1998-10-13 | Endolap, Inc. | Cannula cap including yeildable outer seal and flapper valve |
| US6066117A (en) * | 1996-06-11 | 2000-05-23 | Endolap, Inc. | Cannula flapper valve assembly |
| US5868714A (en) * | 1996-09-16 | 1999-02-09 | Endoscopic Concepts, Inc. | Trocar reducer system |
| US6440063B1 (en) | 1997-04-30 | 2002-08-27 | University Of Massachusetts | Surgical access port and laparoscopic surgical method |
| CA2301278A1 (en) * | 1997-08-11 | 1999-02-18 | M & S Mediquip Limited | Catheter valve |
| US6036672A (en) * | 1998-05-12 | 2000-03-14 | Cabot Technology Corporation | Instrument seal |
| US6227200B1 (en) | 1998-09-21 | 2001-05-08 | Ballard Medical Products | Respiratory suction catheter apparatus |
| US7021313B1 (en) * | 1998-09-21 | 2006-04-04 | Ballard Medical Products | Respiratory suction catheter apparatus with improved valve and collar |
| DE19935725C2 (en) | 1999-07-29 | 2003-11-13 | Wolf Gmbh Richard | Medical instrument, especially a rectoscope |
| US7473221B2 (en) * | 2000-10-19 | 2009-01-06 | Applied Medical Resources Corporation | Surgical access apparatus and method |
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| DE1863280U (en) * | 1962-06-09 | 1962-12-06 | Karl Storz | ADDITIONAL DEVICE TO TROCARS FOR THE INTRODUCTION OF ENDOSCOPES INTO BODY CAVES. |
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-
1992
- 1992-10-13 DE DE4234452A patent/DE4234452C2/en not_active Expired - Fee Related
-
1993
- 1993-09-28 US US08/128,620 patent/US5385560A/en not_active Expired - Lifetime
- 1993-10-08 CA CA002108110A patent/CA2108110A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE4234452C2 (en) | 1994-08-18 |
| DE4234452A1 (en) | 1994-04-14 |
| US5385560A (en) | 1995-01-31 |
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