Force-based heart valve sizer

A heart valve and sizing device technology, applied in heart valve, medical science, surgery, etc., can solve the problems of leakage and embolism, difficult to avoid paravalvular problems, etc.

CN104135972AActive Publication Date: 2014-11-05EDWARDS LIFESCIENCES CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-11-05

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Abstract

A valve sizer for determining an appropriate replacement valve size when performing a heart valve replacement procedure is provided. In one version the valve sizer has a hollow shaft with proximal and distal ends. A movable sizing element couples to the distal end of the shaft and is radially expandable between first, contracted and second, expanded positions. An actuator assembly on a handle includes an actuator coupled to a clutch member via a ball-spring-detent clutch. A rod extends through the shaft and maintains a fixed distance between the handle and a distal hub in the sizing element. Movement of the actuator causes axial movement of the shaft, thereby causing radial expansion of sizing petals relative to the hub. The clutch slips when a predetermined reaction force from the surrounding valve annulus is met by the petals.
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Description

[0001] related application

[0002] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Patent Application Serial No. 61 / 568,913, filed December 9, 2011. technical field

[0003] The present disclosure relates to methods and apparatus for determining valve annulus size. More specifically, the present disclosure relates to heart valve sizers. Background technique

[0004] Replacement of a diseased or malfunctioning heart valve requires accurate sizing of the valve annulus. After a diseased or malfunctioning heart valve has been removed, the surgeon measures the patient's valve annulus to determine the proper replacement valve size.

[0005] Conventional systems for measuring a patient's valve annulus include multiple discs of varying sizes that can be removably or fixedly attached to a rod. The size of each disc corresponds to the available valve size. The surgeon inserts the disc into the patient's valve annulus and checks the fit of the disc in the...

Examples

Embodiment Construction

[0054] refer to Figures 1A-1D , shows a first valve sizer 100 . Valve sizer 100 includes an elongated hollow shaft 104 extending along the length of the sizer. An actuator assembly 106 is coupled to the proximal end of the shaft 104, while a radially expandable sizing element 107 is coupled to the distal end. The shaft 104 is preferably malleable to ensure that it is flexible enough to allow the sizer 100 to enter the annulus from different angles or through curved or curved access pathways. The handle 102 is preferably stationary and serves to hold the valve sizer steady in the operator's hand.

[0055] refer to Figure 1C and 2A - 2C, the actuator assembly 106 includes the actuator 105 , the handle 102 , the clutch ring 121 (also referred to as the ring 121 ), and the clutch cover 126 installed in the actuator 105 . The handle 102 threadingly engages a tubular threaded portion 121B which terminates axially upwardly from a ring 121 which in turn is mounted on the shaft ...