SEC Filing Document

Company: BIOVENTRIX, INC.
Ticker: 
CIK: 1283259
Filing Type: S-1
Document Type: EX-5.1
Date Filed: 2026-02-12
Accession Number: 0001493152-26-006407
Exchange: 
SIC Code: 3841
SIC Description: Surgical & Medical Instruments & Apparatus
URL: https://www.sec.gov/Archives/edgar/data/1283259/000149315226006407/ex5-1.htm

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Exhibit 5.1

1345 AVENUE OF THE AMERICAS, 11 th
FLOOR

NEW YORK, NEW YORK 10105

TELEPHONE: (212) 370-1300

FACSIMILE: (212) 370-7889

www.egsllp.com

February 10, 2026

BioVentrix, Inc.

120 Forbes Blvd., Suite 125

Mansfield, MA 02048 USA

Re:	Registration Statement on Form S-1

Ladies and Gentlemen:

We have acted as counsel
to BioVentrix, Inc. a Delaware corporation (the “Company”), in a public offering pursuant to the Registration Statement
on Form S-1 initially filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act
of 1933, as amended (the “Act”), on [ ], 2026, (the “Registration Statement”), of shares of the
Company’s common stock, par value $ 0.0001 per share (the “Common Stock”), as well as warrants issuable to The
Benchmark Company, LLC (“Benchmark”) and/or its designees, each warrant entitling the holder thereof to purchase
one share of Common Stock (the “Representative’s Warrants”) and the shares of Common Stock issuable upon exercise
of the Representative’s Warrants (the “Representative’s Warrant Shares”). The Common Stock, the Representative
Warrants and the Representative’s Warrant Shares shall be referred to herein as the “Securities.”

The Securities are to be
sold by the Company pursuant to an underwriting agreement (the “Underwriting Agreement”) to be entered into by and
between the Company and Benchmark on behalf of themselves and as representative to the several underwriters to be named therein. The Securities
are to be offered and sold in the manner described in the Registration Statement and the related prospectus included therein (the “Prospectus”).

For purposes of rendering
the opinions set forth below, we have examined such documents and reviewed such questions of law as we have considered necessary and appropriate
for the purposes of our opinion including (i) the Registration Statement, including the exhibits filed therewith, (ii) the Prospectus,
(iii) the Company’s fourth amended and restated certificate of incorporation (as amended, the “Certificate of Incorporation”),
(iv) the Company’s amended and restated bylaws (as amended, the “Bylaws”), (v) the corporate resolutions and
other actions of the Company that authorize and provide for the filing of the Registration Statement, and we have made such other investigation
as we have deemed appropriate. We have not independently established any of the facts so relied on.

We have further assumed
the legal capacity of natural persons, and we have assumed that each party to the documents we have examined or relied on (other than
the Company) has the legal capacity or authority and has satisfied all legal requirements that are applicable to that party to the extent
necessary to make such documents enforceable against that party. We have also assumed that all of the shares of Common Stock issuable
or eligible for issuance pursuant to exercise of the Representative’s Warrants following the date hereof will be issued for not
less than par value.

Based on the foregoing,
we are of the opinion that:

1. Common
Stock. When the Registration Statement becomes effective under the Act and when the offering is completed as contemplated by the
Registration Statement, the shares of Common Stock will be validly issued, fully paid and non-assessable.

2. Representative’s
Warrants. When the Registration Statement becomes effective under the Act and when the Representative’s Warrants are issued,
delivered and paid for, as contemplated by the Registration Statement, such Representative’s Warrants will be legally binding obligations
of the Company enforceable in accordance with their terms except: (a) as such enforceability may be limited by bankruptcy, insolvency,
reorganization or similar laws affecting creditors’ rights generally and by general equitable principles (regardless of whether
enforceability is considered in a proceeding in equity or at law); (b) as enforceability of any indemnification or contribution provision
may be limited under the federal and state securities laws; (c) that the remedy of specific performance and injunctive and other forms
of equitable relief may be subject to the equitable defenses and to the discretion of the court before which any proceeding therefor may
be brought; and (d) we express no opinion as to whether a state court outside of the State of New York or a federal court of the United
States would give effect to the choice of New York law provided for in the Representative’s Warrants.

3. Representative’s
Warrant Shares. When the Registration Statement becomes effective under the Act and when the offering is completed as contemplated
by the Registration Statement, and when the Representative’s Warrants are exercised, the Representative’s Warrant Shares will
be validly issued, fully paid and non-assessable.

We express no opinion as
to matters governed by any laws other than the Delaware General Corporation Law, laws of the State of New York and the federal laws of
the United States of America, as in effect on the date hereof.

We hereby consent to the
filing of this opinion as an exhibit to the Registration Statement and to the reference to our firm under the caption “Legal Matters”
in the Prospectus. In giving such permission, we do not admit hereby that we come within the category of persons whose consent is required
under Section 7 of the Act, or the rules and regulations of the Commission thereunder. This opinion is expressed as of the date hereof,
and we disclaim any undertaking to advise you of any subsequent changes in the facts stated or assumed herein or of any subsequent changes
in applicable law.

Very truly yours,

/s/ Ellenoff Grossman & Schole LLP

Ellenoff Grossman & Schole LLP