Source: http://www.google.com/patents/US6554793?dq=645576
Timestamp: 2017-04-27 04:34:35
Document Index: 163959927

Matched Legal Cases: ['art 5', 'art) 5', 'art 30', 'art 31', 'art 8', 'art 7', 'art 7']

Patent US6554793 - Flexible trocar with an upturning tube system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA flexible trocar assembly includes an inner flexible tube and a concentric outer flexible tube. The flexible tubes are spaced apart from each other so as to form an open ended annular space in the trocar assembly. The annular space contains surgical instrumentation and passages for inflation gases,...http://www.google.com/patents/US6554793?utm_source=gb-gplus-sharePatent US6554793 - Flexible trocar with an upturning tube systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6554793 B1Publication typeGrantApplication numberUS 09/445,534PCT numberPCT/EP1999/002476Publication dateApr 29, 2003Filing dateApr 7, 1999Priority dateApr 7, 1998Fee statusPaidAlso published asDE19815598A1, DE19815598B4, DE59915072D1, EP0993277A2, EP0993277B1, WO1999051283A2, WO1999051283A3Publication number09445534, 445534, PCT/1999/2476, PCT/EP/1999/002476, PCT/EP/1999/02476, PCT/EP/99/002476, PCT/EP/99/02476, PCT/EP1999/002476, PCT/EP1999/02476, PCT/EP1999002476, PCT/EP199902476, PCT/EP99/002476, PCT/EP99/02476, PCT/EP99002476, PCT/EP9902476, US 6554793 B1, US 6554793B1, US-B1-6554793, US6554793 B1, US6554793B1InventorsFritz Pauker, Thomas Viehbach, Robert Pauker, Gerhard WeiglhoferOriginal AssigneeStm Medizintechnik Starnberg GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (14), Referenced by (207), Classifications (33), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetFlexible trocar with an upturning tube system
As can be seen in FIGS. 4 and 6 in particular, the invertible hose 2 of the invention consists of an inner hose section 2 a which slides through a driving and guiding bushing or a hose guiding part 5, and its front (inverted) area is turned up into the front of an outer hose section 2 b. Here the front of the outer hose section 2 b is returned to the driving and guiding bushing (hose guiding part) 5, which consists of a stiff preferably a plastic material, and one axial end is attached to the driving bushing 5 so that it is positioned between the internal 2 a and outer hose section 2 b. In a rear (inverted) area, the inner hose section 2 a is turned up into an external rear hose section 2 c, which is returned to the driving bushing 5 and is affixed to an axial end of the driving bushing 5. On the one hand the driving bushing 5 is used as the guide element for the inner hose section 2 a, to prevent buckling and wrinkling as well as scale formation, and on the other hand as a connecting part of the external front 2 b and the external rear hose section 2 c, where a central area of the driving bushing 5 remains exposed, i.e. not covered by the inverted hose 2. The driving bushing 5 has at least one opening in this central section, preferably a lengthwise slit 6 of a predetermined width extending axially. Presently four lengthwise slits 6 are provided at equal angular distances from each other, as shown in particular in FIG. 6a. The driving bushing 5 in FIG. 6a furthermore has a number of continuous lengthwise grooves 5 a on its inside, which open to the front of the driving bushing 5. Here the lengthwise grooves 5 a may be drawn parallel to the axis or spirally.
This lubrication system comprises a first lubricant conveying and supplying device 15 with a compressed air pump (not illustrated) or a compressed air connector which is attached to a pressurized container 18 in order to pressurize it or supply compressed air to it. This pressurized container 18 has a cover 18 a which can be opened or removed, whereby a loading and unloading opening can be closed. Inside the pressurized container 18 is a removable or exchangeable plastic or rubber bag 18 b, or alternatively a lubricant bellows which is filled with the lubricant to be used. This bag or bellows 18 b has a discharge hose 18 c which passes through a hole in the pressurized container 18 preferably located opposite the pump connection. The hole seals the discharge hose 18 c and for that purpose a packing strip is placed in the hole in this configuration example. In addition or alternatively to this seal, the bag 18 fits tightly against the pressurized container wall, so that the discharge hole is essentially airtight and is separated by the bag 18 b from the pump connector which is preferably located in the cover 18 a. The free end of the discharge hose 18 c has a coupling part 30, which can be connected with a corresponding counter-coupling part 31 on a supply hose 16 of the trocar-invertible hose system, which protrudes laterally from the rear end-section of the trocar shaft 1, especially from the housing of the actuation device 4. As indicated in FIG. 4, the supply hose or channel 16 is placed inside the trocar shaft 1, i.e. in the annular gap between the external jacket 32 and the internal jacket 33 of the trocar 1, up to a discharge hole 17 in the external jacket 32 of the trocar shaft 1 in the area of the invertible hose 2.
It should be pointed out here that during the synchronization process of the advance movements of invertible hose 2 and the trocar shaft 1, the latter slides over the front and rear beads and the area of the driving bushing 5 at the inner invertible hose section 2 a, where the sliding speed of the trocar shaft 1 in relation to the forward and rear bead, i.e. in the inverted areas 2 d and 2 e or in relation to the inner hose section 2 a, is however only half the absolute speed of the inner invertible hose section 2 a. In order not to allow the braking forces on the rear inverted area 2 e to become too large, and possibly prevent an upset of the invertible hose 2 in the rear of the outer hose section 2 c through the braking forces being applied, it is necessary to keep the friction forces between the trocar shaft 1 and the inner hose section 2 a small.
As an alternative to the above described lubricant injection spout 28, a number of mere cutouts or notches (not shown in detail) can be provided in the lateral wall 8 a of the sleeve 8, forming a discharge clearance or gap between the trocar shaft 1 and the application wall 8 a. The clamping part 8 is furthermore equipped with a line connector 8 b which has a fluid connection to the first lubricant conveying device 15 via the supply line 16 and the discharge hose 18 c. All other parts of the trocar-invertible hose system in FIG. 5 correspond to those of the first configuration example.
The housing 11 itself is open on the side facing the inner hose section 2 a, where the endless band is routed so that it seals the open side of the housing 11 as tightly as possible. Gaps between the lateral edges of the endless band and the housing 11 can be sealed with suitable sealing lips attached to the housing walls, which allow the endless band to glide. Furthermore and in regard to the invertible hose 2 attached thereto, the housing 11 is designed so that the side of the endless band exposed to the outside forms a small gap or space above the inner hose section 2 a. During operation of this device, the inner space of the housing 11 is evacuated by the vacuum pump, which draws air out through the perforation in the endless band. suction is simultaneously provided to the inner hose section 2 a which seals the outside of the endless band. This seal of the perforation increases the negative pressure inside the housing so that the endless band curves inward due to its elasticity and moves the inner hose section 2 a with it, as clearly shown in FIG. 8.
This measure holds the inner hose section 2 a tightly against the endless band along its length and simultaneously separates it from the trocar shaft 1. The advance of the trocar shaft 1 thus essentially takes place through the forces applied by the endless band at the front of the inverted area 2 d to the front clamping part 7 during a forward motion of the front of the outer hose section 2 b, while the inner hose section 2 a makes no contact, particularly in the area of the driving unit. Because of the low friction the required advancing force on the front clamping part 7 is relatively low, so that no scaling (formation of folds) must be considered. As with the first and the second configuration example, a lubricant is pressed into the annular gap 9 which further reduces friction, especially in the area of the front and rear sealing bead 2 d, 2 e. As with the first and the second configuration example, the third example as well as its alternative variations therefore provide a continuously or quasi continuously operating drive mechanism which has a mechanical effect on the invertible hose 2 and ensures a precisely controllable advance of the trocar.
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