Syringe Connection Device Preventing Premature Separation
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Solution Overview
Problem
Existing connection devices for syringes and vials may lead users to forget to establish communication between the two, resulting in incorrect usage and failure to mix solutions or medicaments.
Innovation Solution
A connection device with a syringe holding member and a cannula holding member that includes a double-head cannula, featuring a retracted position in the pre-use state and an advanced position in the use state, along with a separation preventing mechanism to ensure the syringe cannot be separated from the holding member until communication is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the syringe is made separable from the holding means at any time, then the ease of operation is improved, but the reliability deteriorates due to possible erroneous separation before communication is established
Solution Approach 1:
The patent changes the state parameter of the connection device by introducing two distinct positions for the cannula holding member: a retracted position where separation is prevented and an advanced position where separation is permitted. This parameter change (position of cannula holding member) controls the engagement state of the separation preventing means, allowing the system to transition between locked and unlocked states based on whether communication has been established.
Solution Approach 2:
The patent makes the separation preventing means dynamic rather than static. The engagement state of the separation preventing means changes automatically based on the position of the cannula holding member. When the cannula holding member is at the retracted position, the separation preventing means engages to prevent syringe separation. When the cannula holding member advances, the separation preventing means disengages to permit separation. This dynamic behavior resolves the contradiction by adapting the separation prevention function to the operational state.
2Reliability
If the separation preventing means is provided to prevent erroneous separation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the separation preventing function with the existing holding means structure. The separation preventing means is integrated into the cannula holding member and syringe holding member assembly, rather than being a completely separate mechanism. The engagement and disengagement of the separation preventing means is coupled with the advancement and retraction of the cannula holding member, combining multiple functions into a unified mechanism that reduces overall system complexity.
Solution Approach 2:
The separation preventing means operates automatically based on the position of the cannula holding member without requiring external control or additional components. The mechanical interaction between the cannula holding member and the separation preventing means creates a self-regulating system where the act of advancing the cannula holding member automatically disengages the separation prevention, and retracting it automatically re-engages the prevention mechanism.
Data Source
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AI summary
The present invention is a device capable of preventing an operation of establishing communication between a syringe and a vial (3) from being forgotten by error. A holding means (4) constituting a connection device (1) includes: a syringe holding member (6) to be attached to a syringe (2); a cannula holding member (7) which includes a double-head cannula (5), being located at a retracted position retracted with respect to the syringe holding member in the pre-use state, and being advanced to an advanced position abutting on the syringe holding member in the use state; and separation preventing means (42) which engages the syringe to prevent separation of the syringe from the syringe holding member in the state where the cannula holding member is located at the retracted position. When the cannula holding member is located at the advanced position, the separation preventing means releases an engagement state with the syringe to permit the separation of the syringe from the syringe holding member.