JPWO2020141197A5

JPWO2020141197A5 -

Info

Publication number: JPWO2020141197A5
Application number: JP2021538709A
Authority: JP
Publication date: 2023-01-19
Anticipated expiration: 2040-01-02

Claims

A joining method for a medical device, which is a surgical instrument or an implant, having a shaft and an attachment to be fixed to the shaft, comprising:
heating the attachment or cooling the shaft such that the inner diameter of the opening of the attachment is greater than the outer diameter of the shaft;
thereafter inserting the shaft into the opening of the attachment;
Thereafter, cooling the attachment to cause the attachment to contract substantially tightly on the shaft, or heating the shaft to expand the shaft within the opening of the attachment. thereby connecting the shaft and the opening via an interference fit;
monitoring the temperature of the attachment or the shaft, respectively, at least a first point on the circumference of the end of the shaft proximate the opening or to be inserted into the attachment; monitoring the temperature at a second point in the area of the attachment boundary spaced from the first point or in the area of the shaft;
joining method.

2. The bonding method of claim 1, further comprising monitoring the temperature of the attachment.

3. The method of claim 2, wherein the temperature of the attachment is monitored at the opening and at an attachment boundary region spaced from the opening .

4. The joining method according to any one of claims 1 to 3, wherein an induction heating device is used for the step of heating the attachment.

5. A method according to any one of the preceding claims, further comprising adjusting the heat input during the heating step depending on the parameters of the shaft and the parameters of the attachment.

6. Claims 1 to 5, wherein the interference fit is dimensioned in such a manner that the shaft and the attachment can be axially and radially connected to each other in an inseparable manner during operation. The joining method according to any one of .

7. The joining method according to any one of the preceding claims, wherein the interference fit has an interference between 20[mu]m and 55[mu]m.

8. Joining method according to any one of the preceding claims, wherein the shaft is made of titanium and the attachment is made of steel.

The joining method according to any one of claims 1 to 8, wherein the maximum heating temperature of the attachment is between 50°C and 350°C.

The joining method according to any one of claims 1 to 9, wherein said step of inserting said shaft into said opening of said attachment is performed via a linear motion unit.

a medical device ,
an attachment having an opening;
a shaft inserted within the opening;
and
The outer diameter of the shaft and the inner diameter of the opening are dimensioned to provide an interference fit, and the attachment is connected to the shaft by a joining method according to any one of claims 1 to 8. medical devices.

12. The medical instrument of claim 11, wherein said shaft is a handle or handle and/or said attachment is a working end or tool head.

13. Medical device according to claim 11 or 12, wherein the shaft is made of titanium and/or the attachment is made of steel.