JPH0444758A - Cup positioner for joint prosthesis tool - Google Patents

Abstract

PURPOSE:To dispense with the selection and exchange of a cup holder 3 suitable to the size by engaging holding a cup from inside by locking beams provided on the side surfaces of the cup holder fixed to acetabulum in contact state. CONSTITUTION:A cup holder 3 for fixing the cup 2 of a joint prosthesis tool fitted into coxal cavity of the pelvis in contact state to the coxal cavity is provided. Locking beams 9a, 9b supported by pivotal shafts and energizing springs 8a, 8b are provided to opening-out direction on the sides of the cup holder 3. On the outsides of the locking beams 9a, 9b, engaging step parts are formed. The engaging step parts on the side surfaces of the locking beams 9a, 9b are engaged by being pressed onto the inner diameter of the cup 2 by the energizing springs 8a, 8b, to integrate the cup holder 3 with the cup 2. Locking pins 1a, 1b are protruded on the top end of the cup holder 3, and the locking pins 1a, 1b are fitted to the locking holes 2c, 1c of the cup 2, whereby the cup 2 is integrally rotated with the rotation of the cup holder 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cup positioner for a joint prosthesis that constitutes an artificial hip joint that is fitted between an acetabulum and a femur.

(B) Prior Art Conventionally, the part of the cup constituting the artificial hip joint is brought into contact with and locked to the part of the acetabulum, the main fastening bolt hole is drilled with a drill, and the fastening bolt is used in the central bolt hole. The force for fixing the cup and the technology related to the positioner were known to the public.

This is a technique as disclosed in the part before the adapter attach/detach connector 25 in FIG.

That is, since the size of the cup 2 is set based on the size of the acetabulum and the degree of damage, etc., the force/tube holder 13 that constitutes the conventional cup positioner simultaneously attaches the adapter to the conventional cup 2 when selecting the size of the cup 2. The cup holder 3 was replaced every time the size of the cup 2 was changed, but the cup holder 3 of the present invention has locking rods 9a and 9.
Since the cup 2 is secured and held from the inside by b, there is no need to replace the cup 2 even if the size of the cup 2 is changed, and the cup 2 is fixed to the handle 5.

A pivot shaft and a biasing spring 8a are attached to the side of the cup holder 3.
・Supported by 8b, locking rods 9a and 9b in the outward opening direction
is provided.

A retaining step is formed on the outside of the locking rods 9a, 9b, and is pressed against the inner diameter of the cup 2 by biasing springs 8a, 8b, thereby securing the side surfaces of the locking rods 9a, 9b. The joining portions engage to integrate the cup holder 3 and the cup 2. Also, a locking pin 1 is attached to the tip of the cup holder 3.
a and 1a protrude, and by fitting the locking pins 1a and 1a into the locking holes 2C and 2C of the cup 2, the cup 2 rotates integrally even when the cup holder 3 rotates. It is composed of

An insertion hole 3a for a drill guide 7 is opened in the center of the cup holder 3, and the drill guide 7 is inserted into the insertion hole 3a.
is removable.

As shown in FIG. 8, the hand drill 1 is inserted through the drill guide 7.
Insert the No. 0 drill 1) and drill the bolt holes in the acetabulum B.

The hole 2b that passes through the drill guide 7 and is drilled in the center of the cup 2 is the hole 2b for screwing the center bolt 18. After the center bolt 18 is screwed in and the cup 2 is fixed, the left and right holes are opened. The locking rods 9a and 9b are held and disengaged, the cup holder 3 is removed, and a hole into which the peripheral bolt 19 is screwed diagonally is opened using a drill 1).

Next, a description will be given of the handle 5, which is constructed from a three-throated shuttle.

The handle 5 includes a cup holder rod 5C to which the cup holder 3 is fixed, an auxiliary rod 5a to which the auxiliary handle 6 is fixed and which is perpendicular to the center reference of the human body, and a pressing rod to which the pressing handle 4 is fixed and which is parallel to the cup center 20. 5d, and a body-centered reference rod 5b forming a midway portion of the pressing rod 5d.

The rods 5a, 5b, and 5d are inclined parallel to the patient's body center line 0-0 on the operating table, thereby determining the mounting angle of the cup 2.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

According to claim (1), in the cup holder for fixing a cup of a joint prosthesis to be fitted into the acetabular fossa of a pelvis in contact with the acetabular fossa, the inside of the cup is attached to the side surface of the cup holder. Since the locking rods 9a and 9b are biased by the expansion device to abut and secure, the locking rods 9a and 9b are activated by the urging springs 8a and 9b.
By being biased to open by the cup holder 8b, there is no need to select or replace a cup holder 3 that fits the size, so that the surgical time can be shortened, reducing the burden on the patient, and making it easier to manage surgical instruments.

According to claim (2), at least one locking pin that fits into the locking hole provided in the inner circumference of the cup protrudes from the outer circumference of the cup holder, so that the locking pins 1a and 1a and the cup 2
By engaging the locking hole 2cm2c drilled in the inner circumference of the cup 2, the cup 2 is engaged with the locking pin 1aia even when the cup holder 3 rotates inside the acetabular fossa. Therefore, the cup 2 rotates as a unit, making positioning the cup 2 easier.

As claimed in claim (3), since the drill guide 7 can be detachably attached to the cup holder 3, another person can insert the drill guide supported by another handle into the insertion hole 3a as in the conventional case. As a result, it is now possible to easily and reliably drill the threaded hole for the center pole 18 at the center of the cup 2 without having to guide the tip of the drill 1).

According to claim (4), the handle for supporting the cup holder is configured as a three-pronged shuttle, the cup holder is attached to the tip of one of the three-pronged shuttles, and at least one of the other two levers is attached to the handle. 1
Since the book is placed along the longitudinal center line of the human body, the attachment angle of the cup 2 with respect to the center of the human body can be clearly grasped, and excellent surgery can be performed.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a cup-fixed joint prosthesis; FIG. 2 is a side sectional view of the cup 2 of the joint prosthesis shown in FIG. 1;
FIG. 3 is an overall plan view showing the cup positioner device of the joint prosthesis of the present invention, FIG. 4 is a side view of the same, and FIG. 5 is a side cross-sectional view with the drill guide 7 removed from the cup holder 3. , FIG. 6 is a side view, FIG. 7 is a view from the handle 5 side of the cup holder 3, and FIG. 8 is a view showing a portion of the conventional cup holder 13. Femoral coxal fossa...locking pin cup locking hole cup holder pressing clamp handle pressing rod b 9a. ...Body-centered reference rod 9b...Latching rod Applicant Yanmar Diesel Co., Ltd. Agent Patent attorney Hisashi Yano Part Figure C Procedural amendment 1,1. August 1013, 1990 1990 Patent Application No. 153461 2 Name of the invention Cambu positioner for joint prosthesis 3 Relationship with the person making the amendment 1 Applicant address 1 Chayamachi, Kita-ku, Osaka Number 32 month name (67
B) Yanmar Diesel Co., Ltd. (0 others) Representative: Atsuo Yamaoka 4, Agent 1) Location: Minamisenba, Chuo-ku, Osaka 1)'' Ul 1
) To No. 9 Nagahori, in the detailed explanation column of the invention in the Chiyo Building specification, drawings 2, 7, and amendment contents page 2, line 1) to line 12, it is stated that ``This conclusion J has been made. I will not amend it to "concluded". and

Claims (4)

[Claims] (1) In a cup holder for fixing a cup of a joint prosthesis to be fitted into the acetabulum in contact with the acetabulum, an expansion device urges the inside of the cup on the side of the cup holder. 1. A cup positioner for a joint prosthesis, characterized in that a locking rod is provided for abutting engagement. (2) A cup for a joint prosthesis according to claim (1), characterized in that at least one locking pin that fits into a locking hole provided in the inner circumference of the cup projects from the outer circumference of the cup holder. positioner. (3) A cup positioner for a joint prosthesis, characterized in that a removable drill guide can be attached to the cup holder according to claim (1). (4) The handle for supporting the cup holder according to claim (1) is configured as a three-pronged rod, the cup holder is attached to the tip of one of the three-pronged rods, and the handle is attached to the tip of one of the three-pronged rods, and A cup positioner for a joint prosthesis, wherein at least one of the cup positioners is aligned along the longitudinal center line of a human body.