Injection device and exchange system comprising injection device

Abstract

The invention discloses an injection device and an exchange system comprising the injection device, and solves the technical problem that a high-pressure medium exchange process is blocked due to thefact that a plunger rod is easily subjected to relatively high torque and deformed when high-pressure medium exchange is carried out in the prior art. The injection device comprises a syringe, a plunger rod and a plunger; the plunger rod and the plunger are matched with the syringe; the injection device further comprises a torque driving part connected with the near rend of the plunger rod; the plunger rod comprises an output propulsion section and an expansion section connected with the output propulsion section; the expansion section extends to the near end of the plunger rod; and the section area of the near end of the expansion section is greater than the section area of the far end. The exchange system comprises the injection device and a collection device matched with the injection device and used for collecting exchanged mediums. According to the injection device in the invention, the diameter of the section of the force application section of the plunger rod is gradually increased; therefore, the torsion resistance capability of the plunger rod is improved; deformation of the plunger rod due to relatively high torsion is prevented; and thus, smooth exchange of the high-pressure medium is effectively ensured.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an injection device and an exchange system containing the injection device. Background technique [0002] Heart valve replacement is often used to treat severe heart valve disease, and replaces the diseased valve with a heart valve prosthesis. There are many types of heart valve prosthesis implanted through catheter, one of which is the heart valve prosthesis with an inflatable cuff in US Patent No. 2009 / 0088836. In the patented technology of Chinese Patent No. CN106794064A, when this type of heart valve prosthesis is implanted in the body, it is necessary to pre-fill the radiopaque medium in the cuff, so that the position of the prosthetic valve can be determined by angiography. After the heart valve prosthesis is implanted in the body and adjusted to a suitable position, it is necessary to replace the pre-filled medium implanted in the body with a permanent...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an injection device and an exchange system containing the injection device, so as to solve the technical problem in the prior art that the plunger rod is easily deformed due to a large torque when exchanging high-pressure media

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