JP2005323700A - Tool for bone flap fixing screw and bone flap fixing screw with tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate centering and positioning of a screw for fitting a bone prosthetic material fixing plate to a screw hole, securing the locking between a screwdriver and a screw head and precisely and easily fitting the screw in the screw hole. <P>SOLUTION: A cylindrical body 2 with a lot number 15 attached to its outer circumferential face is formed with a cylindrical part in the side of an exit 11 having an inside diameter approximately equal to a screw diameter, and a guide member 6 is fitted into the body with its tip approximately accorded to the exit end of the body to cover a flexible tube 5 closely fitted to the cylinder outer circumference and closed with a centering cap 4. The screw locked to the screwdriver is pushed from an entrance 10 into a narrowed area in the exit side and the tip of the screw abuts on a flat face 4B of the centering cap made to abut on the tip of the guide member to be centered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bone flap fixing screw tool for simplifying and ensuring the operation of a screwdriver used for screwing a screw for fixing a joint plate for connecting a bone flap and a skull, and for a bone valve fixing screw in advance. The present invention relates to a tool-equipped bone flap fixing screw in which a screw is centered and set.

  The skull is opened by neurosurgery or the like, and the opening is closed using a bone flap cut out after the operation or an artificial skull valve, and the skull is fixed to the surrounding skull. At that time, the joining plate is straddled from the outside to the bone flap and the skull, and is fixed by screwing with a tapping screw or driving a nail with a retaining protrusion called Harken. This type of fixing method is disclosed in, for example, cited references 1 to 4.

  By the way, when the plate is screwed, a small screw having a diameter of about 2 mm and a length of about 4 mm is used, so that it is difficult to handle. While holding the screw, plate, and bone flap or skull with one hand while the screw is inserted into the hole in the plate, insert the tip of the screwdriver held with the other hand into the cross hole in the screw head. The screw is inserted into the screw hole of the plate, the driver is rotated and screwed into the bone flap or the skull, and the plate is fixed to the bone flap or the skull. Such an operation is extremely difficult and requires a long operation time, which imposes a burden on both the operator and the patient.

Japanese Patent Laid-Open No. 9-206311 JP 2000-135220 A JP 2002-45367 A JP 2003-126107 A

The object of the present invention is to enable easy centering and alignment of the screw for mounting the bone prosthesis fixing plate with respect to the screw hole, as well as to ensure locking between the driver and the screw head, and to screw the screw quickly, accurately and easily. By making it possible, the operation time is shortened and the burden on both the operator and the patient is reduced.
Another object of the present invention is to make it possible to accurately identify the screw used and to easily replenish the screw.

The invention of claim 1 is a tool for centering a bone flap fixing screw with respect to a screw hole of a joining plate, having an inlet at one end and an outlet at the other end, and narrowing down to a cylindrical portion on the outlet side. A body having an inner diameter substantially equal to the diameter of the screw, and a flat surface that closes the outlet of the main body and abuts the outlet end of the main body; And a centering cap for centering by abutting the tip of the screw inserted from above.
With the above configuration, when the driver is inserted from the inlet side of the main body, the screwdriver is locked to the screw head of the screw that has been centered in advance, and then the screw is plated without causing the core to shake by rotating and driving the driver. Screw into the bone flap or skull.

A second aspect of the present invention is the method according to the first aspect, wherein a plurality of vertically divided portions are formed in the cylindrical portion of the constricted area formed on the outlet side of the main body, covering the vertical divided portion of the main body and closely contacting the outer periphery of the cylinder A flexible tube to be fitted, a guide member covering the tube and fitted to the main body so that the tip substantially coincides with the outlet end of the main body, and the outlet of the main body attached to the outer peripheral surface of the guide member A centering cap that is closed and has a flat surface that contacts the outlet end of the main body and the tip of the guide member on the inside, and abuts the tip of a screw inserted from the inlet to the flat surface; And a cap for closing the inlet of the main body.
With the above configuration, by attaching the centering cap to the main body through the guide member, the contact between the flat surface of the centering cap and the outlet end of the main body is ensured, and the abutting work of the screw tip can be performed. Since the centering accuracy is improved and the vertical split part of the main body is covered with a flexible tube, a screwdriver is inserted into the main body and locked to the screw head, and the outlet end of the main body is connected to the plate. Screw the screw into the bone flap or skull through the screw hole without moving the core because the tube acts to advance the driver and screw more straight forward by rotating and pushing the driver after aligning with the screw hole. Can do.

The invention of claim 3 is characterized in that, in claim 1, a lot number for identifying a screw is attached to the outer surface of the main body.
According to the invention of claim 3, the used screw can be accurately identified by looking at the lot number assigned to the tool of the used screw.

The invention of claim 4 is characterized in that, in claim 2, a lot number for identifying a screw is attached to the outer surface of the tube.
According to invention of Claim 4, the effect | action similar to Claim 3 is acquired.

  The bone valve fixing screw with a guide tool according to the invention of claim 5 is characterized in that the centered screw is set in the bone valve fixing screw tool according to any one of claims 1 to 4. .

  According to the first aspect of the present invention, the screw can be set in the main body in a state where the screw is centered with respect to the screw hole of the plate before the operation, and the outlet end of the main body in which the screw is set during the operation is set to the screw hole of the plate. Positioning can be done easily. In addition, since the screwdriver is guided to the throttle area of the main body, the screw head can be securely locked to the tip of the driver, so that the plate spanning the bone flap and the skull can be screwed quickly, accurately and easily. Will be able to. This shortens the operation time and reduces the burden on both the operator and the patient.

  According to the invention of claim 2, by attaching the centering cap to the main body through the guide member, the contact between the flat surface of the centering cap and the outlet end of the main body is ensured, and the tip of the screw is The abutting work is facilitated, and the centering accuracy is improved. In addition, since the vertical division of the main body is covered with a flexible tube, this tube acts to advance the driver and screw more straight, so that the screw can be passed through the screw hole or bone bone or skull without the core being shaken. Can be screwed into. Thus, the same effect as in the first aspect can be obtained.

  According to the invention of claim 3, since the used screw can be accurately specified by the lot number attached to the main body in which the screw is set, the missing screw can be easily and reliably grasped. It becomes easy to manage.

  According to the invention of claim 4, the same effect as that of claim 3 can be obtained.

  According to the invention of claim 5, since the screw in the centered state is set to the bone flap fixing screw tool, the locking of the screw head of the screwdriver and the screw during operation becomes quick, reliable and easy, Positioning can be easily performed on the screw hole of the screw for attaching the plate, so that the operation time can be shortened and the burden on both the operator and the patient can be reduced.

  Insert the screw into the squeezed area of the main body in advance, push the screw head to advance while expanding the squeezed area, center the screw tip against the flat surface of the centering cap, and then fit the cap to the inlet This is achieved by using a centering tool.

  FIG. 1 is a plan view showing an external appearance of an embodiment of a bone valve fixing screw tool according to the present invention, FIG. 2 is a cross-sectional view of a bone valve fixing screw tool, and FIG. 3 is a plan view before assembling a main body and a tube. .

  The bone flap fixing screw tool 1 is used for centering a screw 8 when screwing a screw 8 (see FIG. 4) for fixing a joint plate 12 for joining the bone flap and the skull into a screw hole. And a cap 3 and a centering cap 4 fitted to both ends of the main body 2. The main body 2 is composed of a cylindrical molded body that is open at both ends by a synthetic resin material such as polypropylene. One end has a large-diameter inlet 10 and the other end has a small-diameter outlet 11. A section 2B is provided, and a thread centering portion having an inner diameter substantially equal to the screw diameter is formed in the section 2b. A plurality of vertically divided portions 2c are formed in the cylinder portion in which the area 2b is formed. In the present example, the vertical divisions 2c are formed in all directions.

  A screw lot number (LOT # ***) 15 is assigned to the outer peripheral surface of the cylinder on the entrance side of the main body 2. A flexible tube 5 is fitted to the outer periphery of the tube on the other outlet side so as to cover the vertical split portion 2c and be in close contact with the outer peripheral surface. The tube 5 is made of, for example, silicon. A guide member 6 is fitted into the main body 2 so as to cover the tube 5. The distal end of the guide member 6 is substantially coincident with the outlet end of the main body 2. The centering cap 4 is detachably mounted using the outer peripheral surface of the guide member 6. The centering cap 4 is provided with a protrusion 4a at the inner center, a flat surface 4b is formed on the top of the protrusion 4a, and an annular space 4c is provided between the protrusion 4a and the cap side part 4d. . A part of the cap mounting member 7 for mounting the centering cap 4 to the guide member 6 is fitted into the annular space 4c and protrudes outward. The inner surface of the annular space 4c forms a taper surface when the projecting portion 4a is formed, and an annular protrusion 4e is formed on the outer surface. The cap mounting member 7 is press-fitted here to fix both members together. It is integrated. The inlet 10 of the main body is closed with a cap 3.

Next, the operation of the bone valve fixing screw tool will be described. FIG. 4 is a diagram showing a procedure for setting the bone flap fixing screw A to the tool B, and FIG. 5 is a diagram showing a procedure when using the bone valve fixing screw tool.
First, the centering cap 4 is attached to the guide member 6 of the main body 2 by bringing the flat surface 4 b of the centering cap 4 into contact with the outlet end of the main body 2. The screw head of the screw 8 is locked to the driver 20 (see FIG. 4A). The driver 20 is inserted from the inlet 10 of the main body 2, the screw 8 is inserted into the centering portion 13, and the tip of the screw 8 is abutted against the flat surface 4b of the centering cap 4 to perform centering (see FIG. 4 (2)). ). When the driver 20 is extracted, the screw 8 is held in the main body 2 by friction with the inner wall of the centering portion (see FIG. 4 (3)). The cap 3 is fitted and closed at the inlet 10 of the main body 2 (see FIG. 4 (4)). The necessary number of bone flap fixing screw tools 1 in which screws are set is housed in a case and shipped.

  Subsequently, at the time of use, the inlet cap 3, the centering cap 4, and the guide member 6 are removed (see FIG. 5 (1)), and the driver 20 is inserted into the main body 2 and locked to the screw head (FIG. 5 (2)). After the outlet end of the main body 2 is aligned with the screw hole of the plate 12, the driver 20 is operated, and the plurality of longitudinally split portions 2 c at the front end of the main body 2 covered with the tube 5 are screwed with the screws 8 at the front end taper 2 a. The screw 8 is screwed into the prepared hole 14 of the bone fragment or the skull 9 through the screw hole 12a of the plate 12 without moving the core (see FIG. 5 (3)), and the plate 12 is fixed (FIG. 5 (4)). )reference).

The present invention includes only a bone flap fixing screw tool in which no screw is set, and various screws can be applied to the centering tool described in the embodiments.
In the above embodiment, the lot number is attached to the main body of the tool. However, in the embodiment of the present invention, the lot number may be attached to another member constituting the tool.

It is a top view which shows the external appearance of the Example of the tool for bone flap fixing screws which concerns on this invention. It is sectional drawing of the tool for bone flap fixing screws. It is a top view before the assembly | attachment of a main body and a tube. It is a figure which shows the procedure which sets the bone valve fixing screw A to the tool B. It is a figure which shows the procedure at the time of using the tool for bone flap fixing screws.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bone flap fixing screw tool 2 Main body 3 Entrance cap 4 Centering cap 5 Tube 6 Guide member 7 Cap mounting member 8 Screw 9 Bone piece 10 Inlet 11 Outlet 12 Plate 15 Lot number 20 Driver

Claims (5)

A tool for centering the bone flap fixing screw against the screw hole of the joining plate,
A main body having an inlet at one end and an outlet at the other end, and provided with a narrowed area on the cylindrical portion on the outlet side, the area having an inner diameter substantially equal to the screw diameter;
A centering cap that closes the outlet of the main body, has a flat surface abutted against the outlet end of the main body on the inside, and abuts the tip of a screw inserted from the inlet on the flat surface. When,
A bone flap fixing screw tool characterized by comprising: 2. The flexible structure according to claim 1, wherein a plurality of vertically divided portions are formed in the cylindrical portion of the constricted area formed on the outlet side of the main body, and the vertical divided portions of the main body are covered and closely attached to the outer periphery of the tube. Sex tube and
A guide member that covers the tube and is fitted into the main body so that the tip substantially coincides with the outlet end of the main body;
Mounted on the outer peripheral surface of the guide member to close the outlet of the main body, and has a flat surface inside which is in contact with the outlet end of the main body and the tip of the guide member, and is inserted into the flat surface from the inlet A centering cap for centering by abutting the tip of the screw,
A cap for closing the inlet of the main body;
A bone flap fixing screw tool characterized by comprising:   The bone flap fixing screw tool according to claim 1, wherein a lot number for identifying a screw is attached to an outer surface of the main body.   The bone flap fixing screw tool according to claim 2, wherein a lot number for identifying a screw is attached to an outer surface of the tube.   A bone valve fixing screw with a guide tool, wherein a screw in a centered state is set in the bone valve fixing screw tool according to any one of claims 1 to 4.