Exhibit 31

CERTIFICATION OF PRINCIPAL EXECUTIVE AND PRINCIPAL FINANCIAL OFFICER PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Andrew Jackson, certify that:

| 1. | I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Ra Medical Systems,Inc.; |
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| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material factnecessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by thisreport; |
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| 3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in thisreport; |
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| 4. | The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures(as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant andhave: |
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|   | (a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is madeknown to us by others within those entities, particularly during the period in which this report is beingprepared; |
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|   | (b) | Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report ourconclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;and |
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|   | (c) | Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’smostrecentfiscalquarter(theregistrant’sfourthfiscalquarterinthecaseofanannualreport)thathasmaterially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;and |
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| 5. | The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control overfinancial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalentfunctions): |
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|   | (a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financialreporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and |
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|   | (b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in theregistrant’s internal control over financialreporting. |
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Date: November 27, 2019

 

| By:    | /s/ Andrew Jackson                                                                                                        |
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|   | Andrew Jackson                                                                                                            |
|   | Interim Chief Executive Officer and Chief Financial Officer (principal executive officer and principal financial officer) |