Cannula for the subcutaneous deposition of an object

Details Cannula for the subcutaneous deposition of an object Cannula for the subcutaneous deposition of an object

1996-08-23

1998-09-22

Bockelman, Mark

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 57, 604 60, 604264, 606117, A61M 3100

Patent

active

058107690

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a cannula for deposition of an object in the body of a living organism, comprising a cannula holder having a first handle and a sleeve with a second handle surrounding said cannula holder at least in part and being axially movable in relation thereto, and having a mandrin extending inside the cannula, said object such as medical long-term preparation, identification carrier or capsule containing a radioactive substance being depositable by a relative movement between the mandrin and the cannula receiving the object.
A cannula of this type is shown in WO 92/15362. It was possible for the first time with an appropriate cannula to arrange the object before deposition in a previously known position in order to simplify implantation and to ensure deposition in a required tissue. The position was fixed in particular by a closure closing the cannula at the cannula tip end at least partially and having the form of a salve-like material containing a medical agent, or an adhesive material or silicone plug.
Due to the type of position fixing, foreign matter is introduced into the body during implantation of the object, which might lead to undesirable or unexpected reactions.
Further cannulas for deposition of solid or semi-solid preparations under the skin of a living organism are known for example from U.S. Pat. Nos. 4,900,304, 4,950,234 or EP 0 255 123 A2.
EP 0 304 107 A1 describes an injection cannula for deposition of an implantate, where the cannula itself is intended for once-only use.
According to U.S. Pat. No. 4,820,267, an implantate is position-fixed solely for transport purposes inside a cannula using a mandrin and--distally--using a pin. To prevent the pin from slipping out of the cannula uncontrolled, the pin is fixed on the outside by a protective envelope.
A flexible cannula for the identification of animals is provided in accordance with WO 90/05488, the distal area of which has a smaller cross-section than that in which a mandrin is slidable.
A cannula of the type described at the outset is known from U.S. Pat. Nos. 4,846,793 or 4,994,028, in which the sleeve is designed rotatable relative to the cannula holder in order to achieve mutual engagement. This has the drawback that the insertion of the cannula and subsequent deposition of the object can as a rule only be achieved with two hands.
The object of the present invention is to develop a cannula of the type mentioned at the outset such that on the one hand a problem-free and flawless fixing of the position of the object to be implanted is possible without the need for foreign substances that might penetrate into the body inside which the object is to be implanted. There should also be the possibility of checking the position of the object in simple fashion, even if the cannula consists of non-transparent material, in particular metal. On the other hand, it should be possible to perform insertion of the cannula into the body and subsequent deposition of the element by withdrawing the cannula using one hand.
As regards the possibility for one-hand operation, the object is achieved in that when pressure is applied to the second handle extending from the sleeve, the latter with the cannula holder can be engaged by at least one spreader element extending from this cannula holder or by an engaging or lever element extending from the cannula holder or sleeve.
This measure ensures that during insertion of the cannula into the body it then cannot move--or if so only slightly--relative to the sleeve and hence to the mandrin when the pressure necessary for insertion comes from the sleeve, i.e. the second handle such as the grip.
To deposit the object, it is then only necessary for axial movement of the cannula holder in the direction of the second handle, as a result of which either the engaging element extending from the cannula holder disengages automatically from the sleeve or the lever element is disengaged in controlled form from the sleeve by the hand pulling the cannula holder axially in the direction of the second handle.
In

REFERENCES:
patent: 5725504 (1998-03-01), Collins

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