IP Library › Granted Patent US 12,385,034
Granted Patent B2
US 12,385,034 · App. 16/304,037 · Granted Aug 12, 2025

Methods and apparatus for filtration

Inventor: Benjamin Frank Geldhof (Winthrop, MA)
Assignee: ModernaTX, Inc.
C12N15/1017B01L3/502B01L3/5635B01L2200/143B01L2300/0663B01L2300/0681B01L2400/0487
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Quick Facts
Patent No.
US 12,385,034
App. No.
16/304,037
Granted
Aug 12, 2025
Kind
B2
Abstract

The invention features methods and apparatus for concentrating a nucleic acid. Methods of the invention include providing an initial suspension of a nucleic acid and an initial liquid, contacting the initial suspension with a housing having a filter that does not pass the nucleic acid, pressurizing the housing to produce a filtrate and a nucleic acid retentate from the initial solution, and detecting the volume of the nucleic acid retentate. Apparatus of the invention include a chamber configured to hold a filter housing containing a nucleic acid suspension, a pressure source to filter the suspension, and a detector to depressurize the housing upon detecting the volume reaching a predetermined threshold. The methods and apparatus described herein are useful in filtering, concentrating, and reconstituting nucleic acids, such as mRNA, in processes such as complete buffer replacement.

Claims (18)

1. An apparatus for concentrating nucleic acid, the apparatus comprising:

a) a chamber comprising a housing having a filter configured to hold an initial suspension comprising nucleic acid in contact with the filter;

b) a pressure source configured to releasably engage and pressurize the housing to force liquid in the initial suspension through the filter to produce a filtrate and a nucleic acid retentate;

c) a pressure cap configured to engage the housing with the pressure source;

d) a detector configured to detect the volume of the nucleic acid retentate and depressurize the housing upon detecting the volume reaching a predetermined threshold;

e) a liquid injector configured to inject an additional liquid into the housing;

f) a pump that is connected to the liquid injector and a liquid reservoir; and

g) a processor that:

i) is in communication with the detector;

ii) causes the pressure source to depressurize and lift the pressure cap from the housing upon receiving a signal from the detector indicating a reduction in the volume of the nucleic acid retentate beneath a predetermined threshold; and

iii) causes the pump to automatically inject additional liquid from the liquid reservoir, through the injector, and into the housing upon receiving the signal from the detector indicating the reduction in the volume of the nucleic acid retentate beneath the predetermined threshold and upon the pressure cap being lifted.

2. The apparatus of claim 1 , wherein the chamber is configured to receive the housing provided by a user and position the housing for engagement with the pressure source.

3. The apparatus of claim 1 , wherein the pressure source is configured to inject a gas into the housing.

4. The apparatus of claim 1 , wherein the detector is a capacitive liquid level detector.

5. The apparatus of claim 1 , wherein the liquid injector is configured to inject the additional liquid into the housing after depressurization of the housing.

6. The apparatus of claim 1 , wherein the liquid injector adds the additional liquid into the housing at a rate suitable to sufficiently mix the suspension with the additional liquid.

7. The apparatus of claim 1 , wherein the liquid injector adds the additional liquid at a rate suitable to remove adsorbed nucleic acid from membrane fibers of the filter.

8. The apparatus of claim 1 , wherein the liquid injector is attached to a pump.

Assignments (2)
SECURITY INTEREST Recorded Nov 19, 2025
From: MODERNATX, INC.
To: ARES CAPITAL CORPORATION, AS AGENT
Reel/Frame 073634/0354 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 27, 2018
From: GELDHOF, BENJAMIN FRANK
To: MODERNATX, INC.
Reel/Frame 047588/0836 →
Continuity (2)
Provisional Application 62354246 · Jun 24, 2016
Related Publication 20200318098A1 · Oct 8, 2020
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