Surgery – Instruments – Cutting – puncturing or piercing
Patent
1997-04-23
1999-04-13
Buiz, Michael
Surgery
Instruments
Cutting, puncturing or piercing
606170, A61B 1732
Patent
active
058938613
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a surgical knife, more precisely relates to a surgical knife for cutting out a tendon sheath so as to treat for so-called trigger fingers, etc.
BACKGROUND OF TECHNOLOGY
The inventor of the present invention has invented a surgical knife for cutting out a tendon sheath so as to treat for trigger fingers (see Japanese Patent Publishing Gazette No. 5-55136). A trigger finger means a finger, which cannot smoothly bend and stretch, and it is kept in a bending state when it is bent or stretched until reaching a prescribed angle; it springs back when it is further bent or stretched. Trissen fingers can be treated by cutting out tendon sheaths. The tendon sheath encloses a flexor tendon for bending and stretching a finger, so the damaged finger can be smoothly moved by cutting out the tendon sheath.
A conventional surgical knife is used for cutting out the tendon sheath, and it can be properly used for a normal skin incisional operation and a minimal skin incisional operation. FIG. 10 shows a side view of the conventional surgical knife for cutting out the tendon sheath; FIG. 11 shows an enlarged view of a blade section thereof. The surgical knife comprises: a grip section 10; a shaft section 12 being attached to the grip section 10; a blade section 14 being slightly extended from a side face of a front end section of the shaft section 12; and a guide section 16 being extended, in the same direction as the extended direction of the blade section 14, from a lower end of the blade section 14.
To use the surgical knife, as shown in FIG. 12, a front end of the guide section 16 is introduced into a space between a flexor tendon 18 and a tendon sheath 20, and the tendon sheath 20 is gradually cut out by sliding the guide section 16 on the flexor tendon 18. In the case of the minimal skin incisional operation, skin immediately above the tendon sheath is slightly cut to insert the blade section 14 of the surgical knife.
SUMMARY OF THE INVENTION
In the above described surgical knife, the cutting direction of the blade section 14 is guided by the guide section 16, so the surgical operation can be correctly and safely executed without cutting the flexor tendon even in the case of the minimal skin incisional operation in which an affected part cannot be directly seen. However, it is important for safe surgical operation to visually see the cutting part of the tendon sheath. The surgical knife is abraded by frequent use, so the knife must be ground to keep it sharp; the blade section of the surgical knife will therefore be thinner and its durability will be lower. Therefore, a surgical knife having high sharpness and high durability is required.
An object of the present invention is to provide a surgical knife, which is capable of correctly and safely cutting out the tendon sheath and which has high cutting quality and high durability.
To achieve the object, the present invention has the following constitutions.
The surgical knife for cutting out a tendon sheath, comprises: a grip section; a shaft section being extended from a lower end of the grip section; a blade section being sidewardly extended from a side face of a lower part of the shaft section; and a guide section being extended from a lower end of the blade section in the same direction as the extended direction of the blade section, characterized in that the blade section includes: an arc blade being provided in a connecting part between the guide section and the blade section, the arc blade being formed into an arc shape; and a linear blade being linearly formed between the arc blade and an upper end of the blade section, the linear blade being parallel to the shaft section. The arc blade has high sharpness or high cutting quality; the linear blade assists the arc blade to cut. Since the linear blade is made parallel to the shaft section and its blade angle is wide, the operation can be executed without widely cutting the skin.
If the grip section is formed into a thin and long rectangular parallelepiped bl
REFERENCES:
patent: 1037693 (1912-09-01), Watson
patent: 5282816 (1994-02-01), Miller et al.
patent: 5628760 (1997-05-01), Knoepfler
patent: 5681262 (1997-10-01), Isse
Buiz Michael
Shai Daphna
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